JP3566056B2 - Electronics - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electronic device, and more particularly, to an electronic device that generates a clock signal from power whose voltage fluctuates with time and drives a booster circuit to boost supply power, such as a thermoelectric conversion element. And a portable electronic device to which electric power is supplied from an electronic device.
[0002]
[Prior art]
2. Description of the Related Art Some conventional electronic devices include a power supply device such as a generator or a power supply that supplies power whose voltage varies with time. In such an electronic device, in order to continuously operate the driving circuit of the electronic device, even if the voltage of the power supplied from the power supply device changes with time, the minimum driving voltage of the driving circuit of the electronic device is changed. The power supply capacity of the power supply device is set so as not to fall below the range.
[0003]
For example, as shown in FIG. 24, a conventional electronic device 50 includes a power supply device 502 that supplies power whose voltage varies with time, an oscillation circuit 504 that outputs a clock signal, and a power supply device that is driven by the clock signal. A booster circuit 506 for boosting the power supplied from the power supply 502, a rectifying element 508 for rectifying the boosted power output from the booster circuit 506, and a battery 510 for storing the boosted and rectified power. Was.
[0004]
That is, in the conventional electronic device 500, power whose voltage fluctuates with time is supplied from the power supply device 502 to the oscillation circuit 504 and the booster circuit 506. In the oscillation circuit 504, when the voltage of the power supplied from the power supply device 502 is equal to or higher than the minimum drive voltage of the oscillation circuit 504, driving is started, and a clock signal having a predetermined duty ratio is output to the booster circuit 506.
[0005]
The booster circuit 506 is driven by a clock signal output from the oscillator circuit 504, boosts power supplied from the power supply device 502, and outputs the boosted power. The boosted power is rectified by a rectifying element 508 such as a Schottky diode, and charged and stored in a battery 510. The electric power stored in the storage device 510 is supplied to an electronic device drive circuit (not shown) or the like, and is driven when the supply voltage is equal to or higher than the minimum drive voltage of the electronic device drive circuit.
[0006]
As described above, in order to continuously operate the electronic device drive circuit, the power of the capacitor 510 must not be empty and the power output from the capacitor 510 must not be lower than the minimum drive voltage of the electronic device drive circuit. , It is necessary to charge the battery 510 efficiently.
[0007]
Note that examples of a power supply device that supplies power whose voltage fluctuates according to the above time include a thermoelectric conversion element and a solar panel used in portable electronic devices and the like that consume relatively little power. For example, since a thermoelectric conversion element performs PN junction using P-type and N-type semiconductors and generates an electromotive force by a temperature difference to generate power, if the temperature difference changes with time, the electromotive force ( Voltage) also changes.
[0008]
[Problems to be solved by the invention]
In such a conventional electronic device, since the operation of the electronic device driving circuit is continued even if the voltage supplied from the power supply device 502 changes with time, the voltage supplied to the electronic device driving circuit is minimum. It has been necessary to constantly and efficiently charge the storage battery so as not to drop below the driving voltage.
[0009]
However, in the conventional electronic device 500 shown in FIG. 24, the oscillation circuit 504 is driven by power supplied from the power supply device 502 and the booster circuit 506 is driven by a clock signal from the oscillation circuit. When the voltage of the supplied power is slightly lower than the minimum drive voltage of the oscillation circuit, the oscillation circuit 504 stops, and when the booster circuit 506 stops, the charging of the battery 510 also stops.
[0010]
In this case, charging is stopped even though the power supply device 502 supplies power slightly lower than the minimum drive voltage of the oscillation circuit 504, so that charging time is long and charging efficiency is very poor. There was an inconvenience.
[0011]
Thus, even if the voltage of the power supplied from the power supply device 502 fluctuates with time, the power supply capability may be set in the power supply device 502 so as not to fall below the minimum drive voltage of the oscillation circuit 504. However, there is an inconvenience that the device becomes large and cannot be used for a portable electronic device or the like.
[0012]
The present invention has been made in view of the disadvantages of the related art, and provides an electronic device capable of minimizing a power supply device for supplying power as much as possible and charging a charger with high charging efficiency. The purpose is.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, an electronic device of the present invention includes a power supply unit that supplies power whose voltage varies with time, an oscillation circuit that generates a clock signal, and an oscillation circuit that is driven by a clock signal of the oscillation circuit. A booster circuit for boosting the power supplied from the power supply means; a power storage means for storing the power boosted by the booster circuit; and a power supply circuit provided between the power storage means and the booster circuit; An electronic device having rectifying means for preventing a current from flowing back to the electronic apparatus, wherein one of power supply from the power supply means and power storage from the power storage means is selected. And a first oscillation power control means for supplying the oscillation circuit with the oscillation power.
[0014]
According to this, even if the voltage of the supplied power fluctuates and falls below the operating voltage of the oscillation circuit, the oscillation circuit can be driven by the stored power. Operates, and the supply power can be boosted and stored, so that stable power supply and efficient power storage can be performed.
[0015]
Further, the first oscillation power control means includes a voltage detection means for detecting a voltage supplied from the power supply means, and a switch means for cutting off the power supplied from the power storage means. When a voltage equal to or lower than the value is detected, the voltage is cut off by the switch means.
[0016]
According to this, in the case where there is no supplied power, it is possible to perform efficient power storage by preventing waste of the stored power.
[0017]
Further, the first oscillation power control means includes a voltage comparison means for detecting a change in a voltage supplied from the power storage means, a switch means for cutting off the power supplied from the power storage means, the voltage comparison means, A timing control unit for controlling operation timing with the switch means, and a voltage of the stored power when the switch means is turned on by the timing control unit, and a stored power obtained by operating the oscillation circuit by the stored power. Is compared by the voltage comparing means, and when the voltage of the stored power does not increase, the voltage is cut off by the switching means.
[0018]
According to this, in the case where the storage voltage decreases, the storage power can be efficiently stored by preventing the storage power from being wastefully consumed.
[0019]
Alternatively, the electronic device according to the present invention includes a power supply unit that supplies power whose voltage varies with time, an oscillation circuit that generates a clock signal, and an electric power that is driven by the clock signal of the oscillation circuit and supplied from the power supply unit. A booster circuit that boosts the voltage, a power storage unit that stores the power boosted by the booster circuit, and a power supply unit that is provided between the power storage unit and the booster circuit. Electronic equipment having rectifier means for preventing the electric power from being supplied, supplied power supplied from the power supply means, stored power supplied from the power storage means, and boosted power output from the booster circuit, Alternatively, the storage power can be supplied to the oscillation circuit, and when the booster circuit does not generate a boosted voltage even when the oscillation circuit is operated by the storage power, the storage power is stored. And further comprising a second oscillating power control means for stopping the operation of the oscillation circuit by the power.
[0020]
According to this, in a case where boosted power is not generated from the booster circuit, it is possible to efficiently store power by preventing wasteful consumption of stored power.
[0021]
Further, the second oscillating power control means includes a voltage detection means for detecting a voltage of the boosted power, a switch means for shutting off stored power supplied from the power storage means, A timing control unit for controlling operation timing, wherein the timing control unit turns on the switch means and operates the oscillation circuit with the stored power to operate the oscillation circuit. The voltage is detected by the voltage detecting means, and when the detected voltage is equal to or higher than a predetermined voltage value, the switching means is turned on for a predetermined time, and when the detected voltage is lower than the predetermined voltage value, the switching means is turned off for a certain time.
[0022]
According to this, the voltage of the boosted power from the booster circuit is detected by the voltage detection means, and when only the boosted power less than the predetermined voltage value is obtained, the switch means is provided so that the stored power is not wasted. By turning off, efficient power storage can be performed.
[0023]
Alternatively, the electronic apparatus of the present invention includes a power supply unit that supplies power whose voltage varies with time, an oscillation circuit that generates a clock signal, and an electric power that is driven by the clock signal of the oscillation circuit and is supplied from the power supply unit. A booster circuit that boosts the voltage, a power storage unit that stores the power boosted by the booster circuit, and a power supply unit that is provided between the power storage unit and the booster circuit. Electronic equipment having rectifier means for preventing the electric power from being supplied, supplied power supplied from the power supply means, stored power supplied from the power storage means, and boosted power output from the booster circuit, And a third oscillating power control means for selecting any one of the stored power and the boosted power and supplying the selected power to the oscillating circuit.
[0024]
According to this, the power having the highest voltage is selected from the supplied power, the stored power, and the boosted power, and is supplied to the oscillation circuit to drive the booster circuit. Therefore, stable power supply and efficient power storage are performed. be able to.
[0025]
Further, the third oscillating power control means includes switch means for shutting off stored power supplied from the power storage means, and voltage detecting means for detecting a voltage of the supplied power, wherein the voltage detecting means detects the voltage of the supplied power. When the voltage of the power supplied from the power supply is equal to or lower than a predetermined voltage value, the switch is turned off to stop driving the oscillation circuit by the stored power.
[0026]
According to this, in the case where there is no supplied power, it is possible to perform efficient power storage by preventing waste of the stored power.
[0027]
Alternatively, the third oscillating power control means includes switch means for shutting off stored power supplied from the power storage means, and intermittent drive means for intermittently turning on the switch means, and Means is driven to intermittently supply the stored power to the oscillation circuit.
[0028]
According to this, when the stored power is supplied to the oscillation circuit, the power is intermittently supplied, so that the stored power is prevented from being wastefully consumed, and the power can be stored efficiently.
[0029]
Alternatively, the electronic device of the present invention includes a power supply unit that supplies power whose voltage varies with time, a booster circuit that boosts the power supplied from the power supply unit with a clock signal, and a power supply that boosts the power boosted by the booster circuit. An electronic device comprising: a power storage unit for storing power; and a rectifying unit provided between the power storage unit and the booster circuit, for preventing current from flowing backward from the power storage unit to the booster circuit. A first oscillation circuit that generates a clock signal using power supplied from the power supply, a second oscillation circuit that generates a clock signal using power stored from the power storage unit, and a signal that is supplied from the first oscillation circuit. First switch means for switching whether or not to output a clock signal to the booster circuit; and outputting a clock signal supplied from the second oscillator circuit to the booster circuit. Whether a and a second switching means for switching a clock signal control circuit for supplying to said boosting circuit selects a clock signal generated by either one of the oscillation circuit, and further comprising a.
[0030]
According to this, even when the voltage of the supply power decreases and the first oscillation circuit stops, the booster circuit can be operated by the second oscillation circuit. Since power can be stored, stable power supply and efficient power storage can be performed. Further, when a second oscillation circuit is incorporated in the load circuit that operates on the stored power for a purpose other than boosting, after the second oscillation circuit of the load circuit operates, a clock signal of the oscillation circuit is used. By driving the booster circuit and stopping the first oscillation circuit, it is possible to prevent wasteful consumption of power for operating the first oscillation circuit, and thus efficient power storage can be performed.
[0031]
The clock signal control circuit further includes first voltage comparison means for comparing the voltage of the supplied power with the voltage of the stored power, and the clock signal control circuit generates a clock signal generated by an oscillation circuit to which high-voltage power is supplied. It is selected and supplied to the booster circuit.
[0032]
According to this, the voltage of the supplied power and the boosted power are compared, and the booster circuit is driven by using the clock signal generated at a higher voltage. And efficient power storage.
[0033]
Alternatively, the clock signal control circuit further includes first voltage detection means for detecting the voltage of the power supplied from the power supply means, and the voltage value detected by the first voltage detection means is less than a predetermined value. Then, the second switch is shut off.
[0034]
According to this, when there is no power to be supplied, power can be efficiently stored by preventing waste of driving the oscillation circuit with the second clock signal using the stored power.
[0035]
The clock signal control circuit may include a second voltage comparison unit that compares an increase and a decrease in the voltage of the storage power supplied from the storage unit, and an operation timing of at least the second voltage comparison unit and the second switch unit. A timing control unit for controlling, the second control means being turned on by the timing control unit to capture the stored power, and comparing the captured voltage with the voltage of the stored power after a predetermined time by the second voltage comparing unit. When the voltage of the stored power increases, the second switch is turned on, and when the voltage of the stored power decreases, the second switch is turned off.
[0036]
According to this, when the voltage of the stored power tends to decrease, it is possible to efficiently store the power by preventing waste of driving the oscillation circuit with the second clock signal using the stored power.
[0037]
Alternatively, the electronic device of the present invention includes a power supply unit that supplies power whose voltage varies with time, a booster circuit that boosts the power supplied from the power supply unit with a clock signal, and a power supply that boosts the power boosted by the booster circuit. An electronic device comprising: a power storage unit for storing power; and a rectifying unit provided between the power storage unit and the booster circuit, for preventing current from flowing backward from the power storage unit to the booster circuit. A first oscillation circuit that generates a clock signal using power supplied from the power supply, a second oscillation circuit that generates a clock signal using power stored from the power storage unit, and a signal that is supplied from the first oscillation circuit. First switch means for switching whether or not to output a clock signal to the booster circuit; and outputting a clock signal supplied from the second oscillator circuit to the booster circuit. A second switch for switching whether or not the voltage is higher, a first voltage detector for detecting a voltage of boosted power supplied from the booster circuit, and an operation timing of at least the first voltage detector and the second switch. And a clock signal control circuit having a timing control unit for controlling. If the boosted power of a certain voltage or more cannot be obtained even when the second switch unit is turned on by the timing control unit, the second switch unit is turned on. And a clock signal control circuit for turning off the clock signal.
[0038]
According to this, if boosted power is not generated even when the booster circuit is driven using the clock signal generated by the second oscillator circuit, the oscillator circuit is driven by the second clock signal using the stored power. By preventing waste, power can be efficiently stored.
[0039]
Further, the clock signal control circuit further includes second voltage comparing means for comparing the voltage of the supplied power with the voltage of the stored power, and the clock signal is controlled by a higher voltage power of the supplied power and the stored power. Is supplied to the booster circuit.
[0040]
According to this, since the boosting circuit can boost the voltage using the clock signal generated by the high power out of the supplied power and the stored power, the boosting efficiency is improved, and the power can be stored efficiently. Stable power supply can be performed.
[0041]
Alternatively, the electronic device of the present invention includes a power supply unit that supplies power whose voltage varies with time, a booster circuit that boosts the power supplied from the power supply unit with a clock signal, and a power supply that boosts the power boosted by the booster circuit. An electronic device comprising: a power storage unit for storing power; and a rectifying unit provided between the power storage unit and the booster circuit, for preventing current from flowing backward from the power storage unit to the booster circuit. An oscillation power control circuit that switches and outputs one of the power supplied from the power supply and the boosted power supplied from the booster circuit, and generates a clock signal from the power supplied from the oscillation power control circuit. A first oscillating circuit that generates a clock signal based on the stored power supplied from the power storage means, and a clock that is supplied from the first oscillating circuit. First switch means for switching whether or not to output a clock signal to the booster circuit; and second switch means for switching whether to output a clock signal supplied from the second oscillator circuit to the booster circuit. And a clock signal control circuit that selects a clock signal generated by one of the oscillation circuits and supplies the selected clock signal to the booster circuit.
[0042]
According to this, since the boosting circuit can boost the voltage using the clock signal generated with the highest power among the supplied power, the boosted power, and the stored power, the boosting efficiency is improved, and the power is efficiently stored. And stable power supply can be performed.
[0043]
Further, the clock signal control circuit further includes voltage comparing means for comparing the voltage of the boosted power with the voltage of the stored power, and an oscillation in which a higher voltage power is supplied from the boosted power and the stored power. A clock signal generated by a circuit is selected and supplied to the booster circuit.
[0044]
According to this, it is possible to efficiently boost the voltage by comparing the voltage of the supplied power and the stored power and driving the booster circuit with the clock signal generated by the oscillator circuit driven by the higher voltage power. Thus, stable power supply and efficient power storage can be performed.
Further, the clock signal control circuit further includes intermittent driving means for intermittently driving the second switch means when turning on the second switch means, wherein the second switch means is intermittently driven to drive the second switch means. The clock signal generated by the oscillation circuit is intermittently supplied to the booster circuit.
[0045]
According to this, when the second switch is turned on and the clock signal generated using the stored power is supplied to the booster circuit, the clock signal is intermittently supplied to waste the clock signal. , Power can be efficiently stored.
[0046]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of an electronic device according to the present invention will be described in detail with reference to the drawings. The electronic device of the present embodiment is configured to supply power for driving an electronic device driving circuit such as a movement of a wristwatch, which is a portable electronic device, from a power supply device using a thermoelectric conversion element and to drive the power. is there.
[0047]
(Embodiment 1)
FIG. 1 is a block diagram illustrating a schematic configuration of an electronic device 10 according to the present embodiment.
[0048]
In FIG. 1, an electronic device 10 includes a generator 12, a first power supply line 14, an oscillating power control circuit 16, an oscillating circuit 18, a booster circuit 20, a schottky diode 22 as a rectifier, and a storage device as a power supply. , A second power supply line 26, and the like.
[0049]
Here, a thermoelectric conversion element is used as the generator 12. In the thermoelectric conversion element, for example, a P-type thermoelectric material element and an N-type thermoelectric material element are sandwiched between two substrates. PN junctions, and a plurality of P, N, P, N, etc. are connected in series.
[0050]
In the thermoelectric conversion element, when a temperature difference is given between the PN junctions, a potential difference (electromotive force) corresponding to the temperature difference is generated, and a high generated voltage can be obtained by increasing the number of PN junctions. . Therefore, when the temperature difference is applied between the two substrates, the time change of the electromotive voltage is such that immediately after the temperature difference is applied between the substrates of the thermoelectric conversion element, the voltage sharply increases, but a certain peak occurs. After that, the voltage drops and saturates at a certain value.
[0051]
This is because immediately after a temperature difference is applied between the substrates, the applied temperature difference is applied to the thermoelectric conversion element, so that a large voltage can be generated. However, as the time elapses, the temperature difference between the two substrates is increased. This is because the temperature difference is reduced by heat conduction through the P and N type thermoelectric material elements, and the generated voltage is reduced. Therefore, it is necessary to connect the thermoelectric material elements in series so that a voltage larger than a required voltage value is always obtained even when the output voltage of the heat conversion element is saturated. Due to the susceptibility, more thermoelectric material elements had to be connected in series.
[0052]
The supply power output from the power supply device 12 is supplied via the first power supply line 14, is switched by the oscillation power control circuit 16 described later, and is supplied to the oscillation circuit 18. In addition, power is also supplied from the generator 12 to the booster circuit 20. In addition, the generator 12 is not limited to the above-described heat transfer element, and may be a solar panel (solar cell plate) or another type.
[0053]
The oscillating power control circuit 16 is supplied from the generator 12 via the first power supply line 14 and from the secondary battery 22 via the second power supply line 26 as a power source for the oscillating circuit 18. The control is performed to switch to and supply one of the stored powers.
[0054]
The oscillation circuit 18 generates a clock signal for driving a booster circuit 20, which will be described later, based on the power supplied from the oscillation power control circuit 16. The oscillating circuit 18 has a minimum drive voltage required to drive the oscillating circuit 18. If no more voltage is supplied, the oscillating circuit 18 does not start driving, and the supply voltage decreases to the minimum driving voltage during driving. When it falls below, driving stops.
[0055]
The amplitude of the clock signal generated by the oscillation circuit 18 increases as the voltage of the power supplied to the oscillation circuit 18 increases. When supplied to 20, there is an effect of improving the boosting efficiency.
[0056]
The booster circuit 20 is driven by the clock signal supplied from the oscillation circuit 18 and boosts the voltage of the power supplied from the generator 12. When the amplitude of the clock signal supplied from the oscillation circuit 18 is increased, the boosting efficiency is improved, so that the power supplied from the power supply device 12 can be further increased.
[0057]
The secondary battery 22 is for charging the electric power boosted by the boosting circuit 20 and storing the electric power. The electric power stored in the secondary battery 22 can be driven by supplying it to an electronic device driving circuit (not shown, such as a movement of a wristwatch) serving as a load.
[0058]
The Schottky diode 24 is provided between the secondary battery 22 and the booster circuit 20 to prevent a current from flowing backward from the secondary battery 22 to the booster circuit 20 side, thereby preventing power loss. .
[0059]
The second power supply line 26 supplies the stored power stored in the secondary battery 22 to the oscillation power control circuit 16 described above.
[0060]
FIG. 2 shows an example of a circuit configuration of the oscillation power control circuit 16 of FIG. 1. Three terminals of the oscillation power control circuit 16 have first input terminals 28 to which supply power is input from the generator 12. A second input terminal 30 to which the stored power is input from the secondary battery 22, and an output terminal 32 for supplying power to the oscillation circuit 18. The oscillation power control circuit 16 in FIG. 2 is configured such that Schottky diodes 34 and 36 are arranged to face each other while being connected from the first input terminal 28 and the second input terminal 30 to the output terminal 32.
[0061]
For this reason, of the power supplied from the generator 12 and the secondary battery 22, only the higher voltage power is output to the output terminal 32 via the Schottky diode (34 or 36). Even if the power supplied from the power supply 12 is lower than the minimum drive voltage of the oscillation circuit 18, it is possible to boost the voltage by the booster circuit 20, and to charge the secondary battery 22 efficiently and store the power. Can be.
[0062]
As described above, the oscillating power control circuit 16 of FIG. 2 first starts the oscillating circuit 18 with the power supplied from the generator 12, generates a boosted voltage by the booster circuit 20, Then, the oscillation circuit 18 can be driven using the stored power.
[0063]
FIG. 3 shows another circuit configuration example of the oscillation power control circuit 16 shown in FIG. A feature of the configuration example of FIG. 3 is that a function is added to prevent the oscillation circuit 18 from being driven by using the stored power until power is not supplied from the generator 12 (when it is not necessary to start the generator). On the point.
[0064]
That is, a predetermined reference voltage (detection voltage) output from the reference voltage circuit 38 and a voltage supplied from the generator 12 are compared by the comparator 40, and when the voltage of the supplied power falls below the detection voltage, a positive voltage is output. Then, the PMOS transistor 42 is turned off so that the stored power is not supplied.
[0065]
For this reason, valuable stored power is not wastefully consumed, and more efficient power storage can be performed.
[0066]
7 shows another example of the circuit configuration of the oscillation power control circuit 16 shown in FIG. 1, and FIG. 8 shows a timing chart of three types of signals output from the timer circuit 56 in FIG. It is shown.
[0067]
The feature of the oscillation power control circuit 16 in FIG. 7 is that the function of stopping the operation of the oscillation circuit using the stored power is added when the stored power does not increase even when the oscillation circuit is operated with the stored power. It is.
[0068]
That is, when the signal A of the timer circuit 56 is applied to the gate of the PMOS transistor 60 and the PMOS transistor 60 is turned on at the fall of the signal A, the stored power is taken into the capacitor 62.
[0069]
Thereafter, the rising of the signal B is detected, and the voltage of the stored power taken into the capacitor 62 at the time of the previous falling of the signal A is compared with the voltage of the stored power at that time by the comparator 52. If the voltage at the time of rising is higher, the output of the comparator 52 is input to the D terminal of the D-type flip-flop 54, and the output of the NOR circuit 58 to which the output of the Q terminal and the signal B are input is the PMOS transistor 42. And the PMOS transistor 42 is kept on until the next fall of the signal A. Conversely, if the voltage of the signal B at the time of the rise of the signal is lower, the operation of keeping the PMOS transistor 42 off until the next fall of the signal A is repeated.
[0070]
For this reason, when the storage voltage supplied from the secondary battery 22 decreases, efficient storage is not performed, and it is wasteful to drive the oscillation circuit using the storage power. Therefore, the PMOS transistor 42 is turned off to prevent the consumption of the stored power, and the power is efficiently stored.
[0071]
(Embodiment 2)
The electronic device 50 shown in FIG. 4 is characterized in that the configuration of the electronic device 10 shown in FIG. 1 further includes a third power supply line 46 to which boosted power is input, and operates the oscillation circuit 18 by the stored power. If boosted power is not generated even if the operation is performed, an oscillation power control circuit 44 having a function of stopping the operation of the oscillation circuit 18 with the stored power is provided.
[0072]
FIG. 5 shows a specific circuit configuration example of the oscillation power control circuit 44 of FIG. 4, and FIG. 6 shows a timing chart of two types of signals output from the timer circuit 56 of FIG. I have.
[0073]
In FIG. 5, a reference voltage circuit 50 for generating a predetermined reference voltage, a comparator 52 for comparing a voltage of boosted power output from the booster circuit 20 with a reference voltage, a D-type flip-flop circuit 54, and a NOR circuit 58 The voltage of the boosted power is detected by the voltage detecting means.
[0074]
The signals A and B are output from the timer circuit 56. When the rising of the voltage of the signal A input to the NOR circuit 58 is detected, the PMOS transistor 42 is turned on. Detect power voltage. When the voltage of the boosted power is equal to or higher than the reference voltage value, the PMOS transistor 42 is kept on until the next rising of the signal A, and when it is lower than the reference voltage value, the PMOS transistor 42 is turned off until the next rising of the signal A. The continuing operation is repeated.
[0075]
For this reason, when the voltage of the boosted power supplied from the booster circuit can be obtained only with the boosted power lower than the reference voltage value, the PMOS transistor 42 is turned off so that the stored power is not wasted. By doing so, the secondary battery 22 can be efficiently stored.
[0076]
(Embodiment 3)
Next, a schematic configuration of an electronic device 70 according to the third embodiment will be described. The electronic device 70 shown in FIG. 9 is characterized in that, instead of the oscillation power control circuit 16 of the electronic device 10 shown in FIG. 1, the power supplied from the generator 12 and the boosted power output from the booster circuit 20 Another point is that an oscillation power control circuit 72 is provided, which can switch to driving the oscillation circuit 18 with any of the stored power supplied from the secondary battery.
[0077]
Compared with the oscillation power control circuit 44 in the electronic device 50 of FIG. 4, the oscillation power control circuit 44 detects the voltage value of the boosted power, but cannot capture the boosted power itself as the oscillation power control circuit 72 does. The points are different.
[0078]
FIG. 10 shows a circuit configuration example of the oscillation power control circuit 72 of FIG. As shown in FIG. 10, before the first input terminal 28 and the second input terminal 30 are connected to the output terminal 32, the Schottky diodes 74 and 76 are arranged in the direction of the output terminal. The third input terminal 48 is directly connected to the terminal 32.
[0079]
In the electronic device 70 configured as described above, first, when the oscillation circuit 18 is started using the power supplied from the generator 12 and the boosted circuit 20 generates boosted power, the boosted power is higher than the supplied power. Since the voltage becomes higher, the oscillation power control circuit 72 switches to the boosted power, and the oscillation circuit 18 is driven by the boosted power.
[0080]
After the boosted power boosted by the booster circuit 20 is charged and stored in the secondary battery 22, for example, once the supply power is interrupted and the boosted power is also interrupted, the boosted power is lower than the minimum drive voltage of the oscillation circuit. Even in the case where only the voltage supply capability can be obtained, the boosted power can be obtained again by driving the oscillation circuit 18 by taking in the stored power, and the oscillation circuit 18 can be driven by the boosted power. it can.
[0081]
For this reason, even when the generator 12 has only a supply capacity equal to or lower than the minimum drive voltage of the oscillation circuit, the voltage can be boosted, so that efficient charging can be performed.
[0082]
Further, since the oscillation circuit can be driven using boosted power having a higher voltage than the stored power, the peak value of the clock signal (the so-called amplitude of the clock signal) can be increased, and as a result, Boosting capability is improved, and charging can be performed efficiently.
[0083]
Next, an oscillation power control circuit 72 shown in FIG. 11 shows another example of the circuit configuration. A characteristic of the oscillation power control circuit 72 shown in FIG. 11 is that the oscillation circuit 18 is not driven by using the stored power until power is not supplied from the generator 12 (when it is not necessary to start the generator). The point is that the function is added.
[0084]
That is, the comparator 80 compares a predetermined reference voltage output from the reference voltage circuit 78 with a voltage supplied from the generator 12, and outputs a positive voltage when the voltage of the supplied power falls below the reference voltage. The transistor 82 is turned off so that stored power is not supplied.
[0085]
For this reason, when there is no supplied power, it is possible to efficiently store the power by preventing the stored power from being wastefully consumed.
[0086]
Next, the oscillation power control circuit 72 shown in FIG. 12 shows another example of the circuit configuration. A feature of the oscillation power control circuit 72 shown in FIG. 12 is that a function is added to intermittently take in the stored power when the stored power stored in the secondary battery 22 is used when the oscillation circuit 18 is started. On the point.
[0087]
Referring to FIG. 12, a PMOS transistor 82 is arranged on the way from the second input terminal 30 to the Schottky diode 76, and an intermittent pulse signal for generating a predetermined intermittent pulse signal is supplied to the gate electrode of the PMOS transistor 82. It is connected to a pulse generation circuit 84. Thus, when the gate voltage is “L (low)”, the gate voltage is turned on, and when the gate voltage is “H (high)”, the gate voltage is turned off.
[0088]
This configuration not only allows the drive to start properly if the power equal to or higher than the minimum drive voltage is supplied at the start of startup even if the power supplied to the oscillation circuit 18 is intermittently supplied. By intermittent, the stored power is not wasted and the power consumption can be reduced. Therefore, efficient power storage can be performed.
[0089]
(Embodiment 4)
Electronic device 90 according to the fourth embodiment drives first oscillation circuit 92 with power supplied from generator 12 to generate a clock signal. Further, the second oscillation circuit 94 is driven by the stored power from the secondary battery 22 to generate a clock signal. A clock control circuit 96 that supplies a clock signal for operating the booster circuit 20 is a clock input from the first oscillation circuit 92 or the second oscillation circuit 94 based on the voltage of the supplied power or the stored power. A signal is selected and output to the booster circuit 20, and when a clock signal input from the second oscillator circuit 94 is selected, the first oscillator circuit 92 is stopped. .
[0090]
FIG. 14 shows a circuit configuration example of the clock signal control circuit 96 of FIG. As shown in FIG. 14, the clock signal control circuit 96 outputs a clock signal (input signal) supplied from the first oscillation circuit 92 by first, second, and third NAND circuits 110, 112, and 114 that perform switching. A switch for selecting a terminal 98) and a clock signal (input terminal 106) supplied from the second oscillation circuit 94 and outputting the selected signal to the booster circuit 20 (output terminal 102) is configured.
[0091]
Further, a first voltage comparing means is configured by a comparator circuit 116 and an inverter circuit 118 for comparing a voltage between the input supply power (input terminal 100) and the input storage power (input terminal 104). The clock signal is selected according to the magnitude relationship between the power and the voltage of the stored power.
[0092]
That is, the comparator circuit 116 and the inverter circuit 118 compare the supply power and the voltage of the stored power, and when the voltage of the stored power is lower, turn on the NAND circuit 110 and turn off the NAND circuit 114. On the other hand, when the voltage of the stored power becomes higher, on / off is reversed, and the clock signal input to the turned on NAND circuit is supplied to the booster circuit 20. Further, the output of the comparator circuit 116 is output from the output terminal 108 as a signal for stopping the first oscillation circuit.
[0093]
With this configuration, the voltage of the supplied power and the boosted power are compared, and the booster circuit is driven by using the clock signal generated at a higher voltage. It can be supplied and stored efficiently.
Further, even when the voltage of the power supplied from the generator 12 is lower than the operating voltage of the first oscillation circuit 92, the booster circuit 20 can be driven by the clock signal of the second oscillation circuit. Becomes possible.
Further, in the case of driving a load circuit having a built-in oscillating circuit inside a wristwatch or the like with the stored power, the oscillating circuit becomes the second oscillating circuit 94. By driving the first oscillation circuit 92 and stopping the first oscillation circuit 92, it is possible to prevent wasteful power consumption such as operating two oscillation circuits at the same time, so that efficient power storage becomes possible.
[0094]
FIG. 15 shows another circuit configuration example of the clock signal control circuit 96 shown in FIG. A feature of the clock signal control circuit 96 in FIG. 15 is that the booster circuit 20 is driven by using a clock signal input from the second oscillator circuit 94 when there is no power supply to the clock signal control circuit 96. Is added.
[0095]
That is, as shown in FIG. 15, the clock signal control circuit 96 receives the reference voltage circuit 120 for outputting a predetermined reference voltage and the reference voltage as input to the clock signal control circuit of FIG. And a first voltage detecting means including a comparator circuit 122 for comparing the voltage with the supplied power. When the voltage of the supplied power falls below the reference voltage, the voltage is compared by the comparator 122 and the NAND circuit 114 is turned on. By forcibly turning off, the clock signal input from the second oscillation circuit 94 is cut so that the clock signal cannot be used for driving the booster circuit 20.
[0096]
With this configuration, when the booster circuit 20 is driven using the clock signal of the second oscillation circuit 94 in a situation where the supply power is lost and boosted power cannot be obtained, the stored power is wastefully consumed. Therefore, the input of the clock signal of the second oscillation circuit 94 is forcibly stopped, so that efficient power storage can be performed.
[0097]
FIG. 19 shows still another example of the circuit configuration of the clock signal control circuit of FIG. 13, and FIG. 20 shows a timing chart of three types of signals output from the timer circuit 56 of FIG. ing.
[0098]
A feature of the clock signal control circuit in FIG. 19 is that even when the booster circuit is driven by the second clock signal using the stored power, the voltage of the stored power tends to decrease even when the boosted circuit is driven by the second clock signal using the stored power. The supply of the clock signal to the booster circuit is stopped, and wasteful driving of the booster circuit with the second clock signal using the stored power is prevented.
[0099]
The configuration of the clock signal control circuit shown in FIG. 19 is different from the above-described clock signal control circuit of FIG. 14 in that the power stored by the PMOS transistor 136, the capacitor 138, the comparator circuit 128, the D-type flip-flop circuit 132, and the NAND circuit 134 And a timer circuit 130 as a timing control unit for controlling the operation timing of the second voltage comparing means and the NAND circuit 114.
[0100]
That is, as shown in FIG. 19, when the signal A of the timer circuit 130 is applied to the gate of the PMOS transistor 136 and the PMOS transistor 136 is turned on at the fall of the signal A, the stored power is taken into the capacitor 138.
[0101]
Thereafter, the falling of the signal B is detected, and the voltage of the stored power taken into the capacitor 138 at the time of the previous falling of the signal A is compared with the voltage of the stored power at that time by the comparator 128. When the voltage at the time of the signal falling is higher, the output of the comparator 128 is input to the D terminal of the D-type flip-flop 132, and the output of the NAND circuit 134 to which the output of the Q terminal and the signal B are input is the NAND. The signal is input to the circuit 114, and the NAND circuit 114 is kept on until the next fall of the signal A. Conversely, when the voltage at the time of the signal B falling is lower, the operation of keeping the NAND circuit 114 off until the next falling of the signal A is repeated.
[0102]
For this reason, when the storage voltage supplied from the secondary battery 22 decreases, it is a situation in which efficient power storage is not performed. Therefore, a booster circuit using a clock signal generated using the stored power is used. By turning off the NAND circuit 114 and cutting off the input of the clock signal from the second oscillation circuit 94 so as to forcibly stop the driving of the power supply, the wasteful consumption of the stored power is prevented, and the efficiency is improved. Power storage can be performed.
[0103]
(Embodiment 5)
The electronic device according to the fifth embodiment shown in FIG. 16 has substantially the same configuration as electronic device 90 shown in FIG. 13 described above, except that input terminal 113 is newly provided in clock signal control circuit 124. The boosted power output from the booster circuit 20 is input from the input terminal 113 so that the voltage of the boosted power can be directly detected.
[0104]
That is, the feature of the clock signal control circuit 124 shown in FIG. 16 is that if boosted power is not generated even when the booster circuit 20 is operated using the clock signal supplied from the second oscillator circuit 94, A function of stopping the driving of the booster circuit 20 using the clock signal from the circuit 94 is added.
[0105]
FIG. 17 is a diagram showing an example of a circuit configuration of the clock signal control circuit 124 in FIG. 16, and FIG. 18 is a diagram of two types of signal waveforms output by the timer circuit 130 in FIG. As shown in FIG. 17, the clock signal control circuit 124 controls the clock signal (input signal) supplied from the first oscillation circuit 92 by the first, second, and third NAND circuits 110, 112, and 114 that perform switching. A switch for selecting a terminal 98) and a clock signal (input terminal 106) supplied from the second oscillation circuit 94 and outputting the selected signal to the booster circuit 20 (output terminal 102) is configured.
[0106]
Further, a first voltage comparing means is configured by a comparator circuit 116 and an inverter circuit 118 for comparing a voltage between the input supply power (input terminal 100) and the input storage power (input terminal 104). The clock signal is selected according to the magnitude relationship between the power and the voltage of the stored power.
[0107]
That is, the comparator circuit 116 and the inverter circuit 118 compare the supplied power with the voltage of the stored power, and turn on the NAND circuit 110 and turn off the NAND circuit 114 when the voltage of the stored power is lower. On the other hand, when the voltage of the stored power becomes higher, on / off is reversed, and the clock signal input to the turned-on NAND circuit is supplied to the booster circuit 20. Further, the output of the comparator circuit 116 is output from the output terminal 108 as a signal for stopping the first oscillation circuit.
[0108]
The clock signal control circuit 124 includes a reference voltage circuit 126 for generating a reference voltage, a comparator circuit 128 for comparing the boosted power output from the booster circuit 20 and input (input terminal 113), a D-type flip-flop circuit 132, It comprises a second voltage detection means for detecting a boosted voltage, and a timer circuit 130 as a timing control section for controlling the detection timing of the second voltage detection means.
[0109]
As described above, the second voltage detecting means detects the fall of the signal A output from the timer circuit 130, and when the stored power is higher than the supplied power by the first voltage comparing means, Only the NAND circuit 114 is turned on, and the booster circuit 20 is driven by the clock signal supplied from the second oscillation circuit 94.
[0110]
Thereafter, the rising of the signal B output from the timer circuit 130 is detected, the voltage of the boosted power input from the input terminal 113 is detected, and the boosted voltage is equal to or higher than the reference voltage from the reference voltage circuit 126, and When the voltage of the stored power is higher than the voltage of the stored power, the detection signal for turning on the NAND circuit 114 is continuously supplied until the fall of the next signal A, and the boosted voltage is lower than the reference voltage from the reference voltage circuit 126. When the voltage of the stored power is higher than the supplied power, a detection signal for turning off the NAND circuit 114 can be continuously supplied until the next fall of the signal A.
[0111]
Therefore, when the voltage of the boosted power output from the booster circuit 20 decreases or does not occur, the booster circuit 20 is driven using the clock signal generated by the second oscillation circuit 94 for a certain period of time thereafter. This operation is stopped and this operation is repeated at regular intervals, so that wasteful consumption of stored power is prevented, and power can be stored efficiently.
[0112]
(Embodiment 6)
In the electronic device according to the sixth embodiment, the power supplied from the generator 12 is boosted by the booster circuit 20, and the secondary battery 22 is charged and stored via the rectifier 24. An oscillating power control circuit 140 that switches to higher power of the supply power output from the generator 12 and the boosted power output from the booster circuit 20 and supplies the higher power to the first oscillator circuit 92; A first oscillation circuit 92 that generates a clock signal based on the power supplied from the oscillation power control circuit 140, and a second oscillation circuit 94 that generates a clock signal based on the stored power stored in the secondary battery 22 And
[0113]
Further, the boosted power is compared with the voltage of the stored power, and the booster circuit 20 is driven by selecting the clock signal from the first oscillation circuit 92 or the second oscillation circuit 94 generated based on the power composed of the higher voltage. It is something to do.
[0114]
For example, when power is supplied from the generator 12, the oscillation power control circuit 140 activates the first oscillation circuit 92 based on the supplied power, and the clock signal generated there is selected by the clock signal control circuit 142. The boosting circuit 20 is driven to store the boosted boosted power in the secondary battery 22.
[0115]
When the boosted power is input to the oscillation power control circuit 140, the first oscillation circuit 92 generates a clock signal based on the boosted power and drives the booster circuit with the clock signal based on the boosted power. When the secondary battery 22 is sufficiently charged and the voltage of the stored power becomes higher than the boosted power, the clock signal control circuit 142 drives the booster circuit 20 with the clock signal generated by the second oscillation circuit 94. I do.
[0116]
As described above, in the electronic device of FIG. 21, compared with the electronic device shown in FIG. 13 or FIG. 16, the booster circuit 20 is driven by the clock signal generated in the boosted power state where the voltage becomes the highest when storing power. Therefore, the voltage can be efficiently boosted by a clock signal having a large amplitude, and power can be efficiently stored.
[0117]
FIG. 22 is a diagram illustrating a circuit configuration example of the oscillation power control circuit 140 of FIG. In FIG. 22, an input terminal 144 to which power supplied from the power generation means 12 is input and an input terminal 146 connected to the output side of the booster circuit 20 are connected to an output terminal 148 for supplying power to the first oscillation circuit 92. And a rectifying element 149 is disposed so as to prevent a current from flowing backward from the input terminal 146 or the output terminal 148 to the input terminal 144. For this reason, either the high-voltage supply power or the boosted power can be selected and supplied to the first oscillation circuit 92.
[0118]
FIG. 23 is a diagram illustrating a circuit configuration example of the clock signal control circuit 142 in FIG. As shown in FIG. 23, the clock signal control circuit 142 supplies a clock signal (input signal) supplied from the first oscillation circuit 92 by first, second, and third NAND circuits 150, 152, and 154 that perform switching. A switch for selecting a terminal 98) and a clock signal (input terminal 106) supplied from the second oscillation circuit 94 and outputting the selected signal to the booster circuit 20 (output terminal 102) is configured.
[0119]
Further, a voltage comparing means is configured by a comparator circuit 156 and a inverter circuit 158 for comparing the voltage of the input boosted power (input terminal 100) with the input storage power (input terminal 104). The clock signal is selected according to the magnitude relationship between the voltages of the stored power.
[0120]
Further, a pulse signal is intermittently input from the intermittent pulse generation circuit 160 to the NAND circuit 154. Therefore, when the booster circuit 20 is driven by the clock signal from the second oscillation circuit 94 by turning on the NAND circuit 154, the on / off of the NAND circuit 154 is repeated by the intermittent pulse signal, and the NAND circuit 154 is supplied to the booster circuit 20. The generated clock signal is also intermittent.
[0121]
Since the operation is performed as described above, even when the supply power from the generator 12 is interrupted and the boosted power is lost, even if the supply power equal to or lower than the operating voltage of the first oscillation circuit 92 is generated, the second oscillation circuit 94 Since the booster circuit can be driven by the clock signal generated in step (1), boosted power is generated, and the booster circuit 20 can be driven by the first oscillation circuit 92. As described above, the period during which the booster circuit is driven using the clock signal generated by the second oscillation circuit 94 is a period until the booster circuit 20 can be driven using the clock signal of the first oscillation circuit 92. Only the period is fine.
[0122]
For this reason, it is possible to prevent the power supplied to the booster circuit with the clock signal generated by the second oscillation circuit 94 using the stored power from being wasted, and the power can be stored efficiently.
[0123]
As described above, according to the above-described embodiment, the voltage from the generator in which the voltage of the supplied power fluctuates is increased, and the load circuit is operated with the increased power, or the increased power is stored in the storage means. In the case of an electronic device that operates a load circuit with the stored power, the present invention is effective even when the voltage of the power supplied from the generator falls to or below the minimum drive voltage for driving the booster circuit.
[0124]
In particular, according to the present invention, when the portable electronic device is activated and operated by using the electric power generated by the generator, it is possible to efficiently store the electric power. For this reason, the operation time can be extended as much as possible even when a period during which power is not generated occurs.
[0125]
For example, by using the thermoelectric conversion element of the present embodiment as a generator and applying it to a wristwatch that drives a timepiece system with boosted power obtained by boosting its electromotive force or stored power stored in its storage means, A wristwatch utilizing the electromotive force of a thermoelectric conversion element that operates for a sufficient time even when the wrist is removed can be realized.
[0126]
In the above embodiment, the thermoelectric conversion element is used as a generator, but the present invention is also effective for a solar cell or a coil generator in which the voltage of the supplied power is likely to fluctuate.
[0127]
【The invention's effect】
According to the present invention, it is possible to reduce the size of a power supply device for supplying power as much as possible and to charge a charger with high charging efficiency.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a schematic configuration of an electronic device according to a first embodiment.
FIG. 2 is a circuit configuration diagram of the oscillation power control circuit of FIG. 1;
FIG. 3 is another circuit configuration diagram of the oscillation power control circuit of FIG. 1;
FIG. 4 is a block diagram illustrating a schematic configuration of an electronic device according to a second embodiment.
5 is a circuit configuration diagram of the oscillation power control circuit of FIG.
FIG. 6 is a signal waveform diagram in FIG.
FIG. 7 is a circuit configuration diagram of the oscillation power control circuit of FIG. 1;
8 is a signal waveform diagram in FIG.
FIG. 9 is a block diagram illustrating a schematic configuration of an electronic device according to a third embodiment.
FIG. 10 is a circuit configuration diagram of the oscillation power control circuit of FIG. 9;
FIG. 11 is another circuit configuration diagram of the oscillation power control circuit of FIG. 9;
FIG. 12 is a circuit configuration diagram of the oscillation power control circuit of FIG. 9;
FIG. 13 is a block diagram illustrating a schematic configuration of an electronic device according to a third embodiment.
14 is a diagram illustrating a circuit configuration example of the clock signal control circuit in FIG. 13;
FIG. 15 is a diagram illustrating another configuration example of the clock signal control circuit of FIG. 13;
FIG. 16 is a block diagram illustrating a schematic configuration of an electronic device according to a fourth embodiment.
17 is a diagram illustrating a circuit configuration example of the clock signal control circuit in FIG. 16;
18 is a signal waveform diagram in FIG.
19 is a diagram illustrating another example of the circuit configuration of the clock signal control circuit in FIG. 16;
20 is a signal waveform diagram in FIG.
FIG. 21 is a block diagram illustrating a schematic configuration of an electronic device according to a fifth embodiment.
FIG. 22 is a circuit configuration diagram of the oscillation power control circuit of FIG. 21;
FIG. 23 is a circuit configuration diagram of the clock signal control circuit of FIG. 21;
FIG. 24 is a diagram showing a schematic configuration of a conventional electronic device.
[Explanation of symbols]
10 Electronic equipment
12 generator
14 1st power supply line
16 Oscillation power control circuit
18 Oscillation circuit
20 Boost circuit
22 Secondary battery
24 Schottky diode
26 Second power supply line

Claims (6)

Power supply means for supplying power whose voltage varies with time; an oscillation circuit for generating a clock signal; a booster circuit driven by a clock signal of the oscillation circuit to boost power supplied from the power supply means; Power storage means for storing power boosted by the circuit ,
An electronic device comprising: a first oscillation power control unit that selects any one of power supply power supplied from the power supply unit and storage power supplied from the power storage unit and supplies the selected power to the oscillation circuit. ,
The first oscillation power control unit includes a voltage detection unit that detects a voltage supplied from the power supply unit, and a switch unit that cuts off power supplied from the power storage unit,
An electronic apparatus, wherein when the voltage detecting means detects a voltage lower than a predetermined value, the voltage is cut off by the switch means . Power supply means for supplying power whose voltage varies with time; an oscillation circuit for generating a clock signal; a booster circuit driven by a clock signal of the oscillation circuit to boost power supplied from the power supply means; Power storage means for storing power boosted by the circuit,
An electronic device comprising: a first oscillation power control unit that selects any one of power supply power supplied from the power supply unit and storage power supplied from the power storage unit and supplies the selected power to the oscillation circuit. ,
The first oscillation power control means includes a voltage comparison means for detecting a change in a voltage supplied from the power storage means, a switch means for interrupting power supplied from the power storage means, the voltage comparison means, and the switch means. And a timing control unit for controlling the operation timing with the
The voltage control unit compares the voltage of the stored power when the switch unit is turned on by the timing control unit and the voltage of the stored power obtained by operating the oscillation circuit with the stored power. The electronic device is characterized in that when the value does not increase, it is cut off by the switch means. Power supply means for supplying power whose voltage varies with time; an oscillation circuit for generating a clock signal; a booster circuit driven by a clock signal of the oscillation circuit to boost power supplied from the power supply means; An electronic device comprising: a power storage unit that stores power boosted by a circuit; and a rectifying unit that is provided between the power storage unit and the booster circuit and that prevents a current from flowing backward from the power storage unit to the booster circuit. And
Supply power supplied from the power supply unit, storage power supplied from the power storage unit, and boosted power output from the booster circuit are input, and the supply power or the storage power can be supplied to the oscillation circuit. And a second oscillating power control means for stopping the operation of the oscillating circuit by the stored power when the boosted circuit does not generate a boosted voltage even when the oscillating circuit is operated by the stored power. Electronics. The second oscillating power control means includes a voltage detection means for detecting a voltage of the boosted power, a switch means for shutting off stored power supplied from the power storage means, and an operation timing of the voltage detection means and the switch means. And a timing control unit for controlling the
The voltage control means detects the voltage of the boosted power output from the booster circuit obtained by operating the oscillating circuit by the stored power and turning on the switch means in the timing control section, and the detected voltage is a predetermined voltage. 4. The electronic apparatus according to claim 3 , wherein the switch means is turned on for a predetermined time when the value is equal to or more than the value, and is turned off for a certain time when the voltage is less than a predetermined voltage value. Power supply means for supplying power whose voltage varies with time; an oscillation circuit for generating a clock signal; a booster circuit driven by a clock signal of the oscillation circuit to boost power supplied from the power supply means; An electronic device comprising: a power storage unit that stores power boosted by a circuit; and a rectifying unit that is provided between the power storage unit and the booster circuit and that prevents a current from flowing backward from the power storage unit to the booster circuit. And
The supply power supplied from the power supply unit, the storage power supplied from the power storage unit, and the boosted power output from the booster circuit are input, and any one of the supply power, the storage power, and the boosted power is input. selects one power an electronic device including a third oscillation power control means for supplying to said oscillation circuit,
The third oscillation power control unit includes a switch unit that shuts off stored power supplied from the power storage unit, and a voltage detection unit that detects a voltage of the supplied power,
When the voltage of the power supplied from the power supply unit detected by the voltage detection unit is equal to or less than a predetermined voltage value, the switch unit is turned off to stop driving the oscillation circuit by the stored power. machine. Power supply means for supplying power whose voltage varies with time; an oscillation circuit for generating a clock signal; a booster circuit driven by a clock signal of the oscillation circuit to boost power supplied from the power supply means; An electronic device comprising: a power storage unit that stores power boosted by a circuit; and a rectifying unit that is provided between the power storage unit and the booster circuit and that prevents a current from flowing backward from the power storage unit to the booster circuit. And
The supply power supplied from the power supply unit, the storage power supplied from the power storage unit, and the boosted power output from the booster circuit are input, and any one of the supply power, the storage power, and the boosted power is input. An electronic apparatus including third oscillation power control means for selecting one power and supplying the selected power to the oscillation circuit,
The third oscillation power control unit includes a switch unit that shuts off stored power supplied from the power storage unit, and an intermittent drive unit that turns on the switch unit intermittently,
An electronic apparatus wherein the intermittent driving means drives the switch means to intermittently supply the stored power to the oscillation circuit.

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