JP2001217758A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system, with which the signals of a quantity sufficient for charging can be secured on the receiving side when generating a power source from signals received through a communication line. SOLUTION: The transmission of signals is performed between first electronic equipment 1, to which a power source circuit 5 is connected, and second electronic equipment 2, to which an external power source is not connected, by connecting both the electronic equipment through a communication line 13. The first electronic equipment 1 can send out a power signal SP for power generation with a power signal generating circuit 102 and when a power supply request signal Spr is sent from a power supply request signal generating circuit 204 of the second electronic equipment 2 to the first electronic equipment 1 while no transmission is performed, the power signal Sp is sent from the first electronic equipment 1 to the communication line 13. This power signal Sp is converted to a DC voltage by a rectifying/charging circuit 22, and a power source for the second electronic equipment 2 is generated by charging a secondary battery 23 while using this DC voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply system, and more particularly, to a second electronic device which receives a signal transmitted from a first electronic device, converts the received signal into a DC voltage, and converts the received signal into a DC voltage. And a power supply method for generating a power supply for the electronic device.

FIG. 6 shows a conventional power supply system. In the power supply system shown in FIG. 6A, a communication line 3 and a power supply line 4 are connected between a first electronic device 1 and a second electronic device 2, and the first electronic device 1 has a power supply circuit. 5 is connected. A dedicated power supply circuit is not connected to the second electronic device 2, and power is supplied via the first electronic device 1 and the power supply line 4. Also, the first electronic device 1 and the second
The communication between the electronic devices 2 is performed using the communication line 3. As described above, since the second electronic device 2 receives the power supply from the first electronic device 1 via the dedicated power supply line 4, the second electronic device 2 operates without preparing a separate power supply.

In the power supply system shown in FIG. 6B, in the configuration shown in FIG. 6A, only one common line 6 is connected between the first electronic device 1 and the second electronic device 2. , For communication and power supply. The first electronic device 1 superimposes a power signal Sb (for example, a DC power different from the communication signal Sa) on the transmission signal Sa onto the shared signal 6.
A power separating circuit 8 for separating a superimposed signal sent from the first electronic device 1 into a signal Sa and a power signal Sb is provided in the second electronic device 2. Is provided. The power signal Sb separated by the power separation circuit 8 is supplied to a rectifier circuit and a charging circuit (both not shown).
, And the secondary battery (not shown) is charged using the DC voltage. The output of the secondary battery serves as a power source for the second electronic device 2. In this configuration, the connection between the first electronic device 1 and the second electronic device 2 can be achieved by one shared line 6, so that the number of wirings can be reduced and maintenance and inspection are facilitated.

FIG. 7 shows another conventional power supply system. The first electronic device 11 and the second electronic device 12 are connected to the communication line 1.
3 and communicate with each other via the communication line 13. The first electronic device 11 includes the transmission circuit 1
4, a receiving circuit 15, a switch (SW) 16, and a control circuit 17. Second electronic device 12
Is configured to include a transmission circuit 18, a reception circuit 19, a switch 20, a control circuit 21, a rectification / charge circuit 22, and a secondary battery 23.

[0005] transmitting circuit 14 generates a signal S ₁₂ sent to the second electronic device 12, the switch 16 is constituted by using a relay or the like, selects a transmission circuit 14 or receiving circuit 15, control circuit 17 The switch 16 is controlled. Transmission circuit 18 generates a signal S ₂₁ sent to the first electronic device 11.
Similarly, the switch 20 is also configured using a relay or the like, selects the transmission circuit 18 or the reception circuit 19, and the control circuit 21 controls the switch 20. Rectifier / charge circuit 22
Includes a rectifier circuit and a charging circuit for rectifying the signal S ₁₂ which is received through the switch 20 to charge the secondary battery 23 by its output. A rechargeable storage battery such as a Ni-Cd battery is used as the secondary battery 23, and supplies power to each circuit in the second electronic device 12.

In FIG. 7, the first electronic device 11
When transmitting to the second electronic device 12, the switch 16 is controlled.
The control circuit 17 selects the transmission circuit 14 side. Ma
In addition, the second electronic device 2 is in a standby state except when transmitting.
You. Signal S of first electronic device 1 ₁₂Are the transmission circuit 14 and
Sent to the communication line 13 via the switch 16 and
Received by the electronic device 12. In the first electronic device 1
Is the signal S₁₂Switch, switch switch 16 to the receiving side.
Wait. The received signal is passed through switch 20
Then, it is taken into the receiving circuit 19. Meanwhile, the second electronic device
At 12, the signal S from the first electronic device 11₁₂After receiving
The switch 20 is switched to the transmission circuit 18 side, and the signal S
_{twenty one}Is the transmission circuit 18 of the second electronic device 12 → the switch 20
→ Communication line 13 → Switch 16 → Receiving circuit 15
Transmitted. This signal S_{twenty one}After receiving the first electronic device
The device 1 transmits the next signal to the second electronic device 2. This
Thus, the first electronic device 1 and the second electronic device 2 alternately send
The faith is repeated.

The power supply of the second electronic device 12 uses a signal S ₁₂ from the first electronic device 11 to supply a rectification / charge circuit 22.
And the secondary battery 23. First electronic device 1
Signal signal S ₁₂ from 1, for the rectifier-charger circuit 22 can be regarded as an AC signal, therefore it is possible to generate a rectified to a DC voltage. The DC voltage thus obtained is input to the charging circuit after being smoothed, and the output is applied to the secondary battery 23. The secondary battery 23 for a period of time in the signal signal S ₁₂ is generated, it is charged by rectifying and charging circuit 22. Period signal signal S ₁₂ can not receive is not performed charging, charging energy of the secondary battery 23 is a second electronic device 2
Used as a power source for

FIG. 8 shows signal transmission in the power supply system of FIG. The signal S ₁₂ from the first electronic device 11 and the signal S ₂₁ from the second electronic device 12 are transmitted alternately on the communication line 13. FIG. 8A shows a case where the transmission time widths of the first electronic device 11 and the first electronic device 12 are the longest. The signal S ₂₁ is generated from the second electronic device 12 only during a period of τ ₂₁ , and is transmitted at a predetermined interval. The mutual signal S _21, first after the switching time tau _a 1 of the electronic device 11
Signal S ₁₂ from occurs only during the period of tau _12. When the transmission of the signal S ₁₂ is completed, the signal S ₂₁ is transmitted after the switching time tau _b. Thus, the signals S ₁₂ and S ₂₁ are alternately transmitted with the switching time τ _a or τ _b interposed therebetween, and the signal S ₁₂
, The output energy of the rectifying / charging circuit 22 increases, and the secondary battery 23 is sufficiently charged.

[0009] (b) in FIG. 8 is sending time tau ₁₂ of the signal S _12, S _21, a case tau ₂₁ is short. In this case, short delivery time tau ₁₂ of the signal S _12, for polling period tau _p is long,
The output voltage of the rectifying / charging circuit 22 decreases, and the secondary battery 2
3 will be insufficiently charged. When the charging of the secondary battery 23 becomes insufficient, the output voltage of the secondary battery 23 decreases,
It is difficult to operate the electronic device 12.

[0010]

However, according to the conventional power supply system, in the configuration of FIG.
In addition, it is necessary to provide the power supply line 4 and the number of wirings increases. In the configuration of FIG. 6B, only one line is required, but it is necessary to separately provide a power superimposing circuit 7 for superimposing DC power or the like on the shared line 6 in the first electronic device 1 on the supply side. is there. Further, in the configuration of FIG. 7, when the polling period τ _p is long as shown in FIG.
2 is shortened, and as a result, the secondary battery 23
Is insufficient, and sufficient power cannot be supplied to the circuits in the second electronic device 12.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a power supply system capable of securing power sufficient for charging at a receiving side when generating power from a signal received via a communication line.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a first electronic apparatus which operates by receiving power supply from an external power supply circuit, and a chargeable power supply provided inside. A second electronic device operated by a transmission line is connected to the first electronic device via the transmission line to perform communication between the first and second electronic devices via the transmission line. In a power supply method for charging the rechargeable power supply of the second electronic device, the first electronic device includes a power signal generation circuit that generates a power signal for charging the rechargeable power supply, and the power signal. And a transmission / reception circuit for transmitting a transmission signal transmitted from the second electronic device and transmitting and receiving the transmission signal from the second electronic device, wherein the second electronic device communicates with the first electronic device. When not going A power supply request signal generating circuit for generating a power supply request signal for requesting the power signal, and transmitting the transmission signal to the first electronic device, and a transmission signal transmitted from the first electronic device; There is provided a power supply method including a transmission / reception circuit for receiving a power signal.

According to this configuration, the first electronic device and the second electronic device
In addition to communicating with each other via transmission lines connected between electronic devices, the second
The power supply request signal generation circuit in the electronic device transmits a power supply request signal to the first electronic device, and in response to the request, the first electronic device sends the power signal to the second electronic device. By converting the power storage signal into a DC voltage, it is possible to charge a rechargeable power supply in the second electronic device and to secure sufficient power to generate a power supply for the second electronic device. become. As a result, sufficient power can be supplied even when performing polling communication with a long cycle.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a power supply system according to the present invention. In FIG. 1, a power supply request function and a power signal transmission function are added to the configuration of FIG.
The first electronic device 11 includes a transmission circuit 14, a reception circuit 15,
Switch 16, control circuit 17, transmission signal generation circuit 10
1, a power signal generation circuit 102, a mixing circuit 103, and a reception signal processing circuit 104. The second electronic device 12 includes a transmission circuit 18 and a reception circuit 1
9, switch 20, control circuit 21, rectification / charge circuit 2
2. It includes a reception signal processing circuit 201, a mixing circuit 202, a transmission signal generation circuit 203, and a power supply request signal generation circuit 204 that generates a power supply request signal _Spr .

The transmission signal generation circuit 101 includes a communication line 13
Generating a signal S ₁₂ to be sent to. Power signal generation circuit 10
2 generates a power signal S _p for charging the secondary battery 23. The mixing circuit 103 passes through the transmission signal generation circuit 101 and the power signal generation circuit 102 and
Send to The reception signal processing circuit 104
With processes signals S ₂₁ outputted, the information 105 associated with the transmission is sent to the transmission signal generating circuit 101, activates the power signal generating circuit 102 upon receiving a power supply request signal S _pr from the control circuit 17 _Is output to the control circuit 17 for switching to the transmission circuit 14 side.

The reception signal processing circuit 201 processes the signal S ₁₂ output from the receiving circuit 19, associated with the transmission information 1
06 In addition to delivering to the transmission signal generating circuit 203, when it is determined that the polling period tau _p is long, the power supply request signal generating circuit to send a power supply request signal S _pr after receiving a signal S ₁₂ 204 and A control signal S _C2 is sent to the control circuit 21. Mixing circuit 202 sends by passing the signal S ₂₁ from the power supply request signal S _pr and the transmission signal generating circuit 203 from the power supply request signal generating circuit 204 to the transmission circuit 18. Transmission signal generating circuit 203 sends to the mixing circuit 202 generates a signal S _21.

FIG. 2 shows two typical examples of the contents of signal transmission between the first electronic device 11 and the second electronic device 12. The operation of the power supply system of FIG. 1 will be described with reference to FIG. In Figure 2 (a) shows a first example of a transmission pattern of the power supply request signal S _pr and the power signal S _p. The communication procedure between the first electronic device 11 and the second electronic device 12 is the same as that described with reference to FIG. When the reception signal processing circuit 201 determines that the polling period τ _p is long, the signal S ₂₁ is transmitted from the second electronic device 12 for a period of τ ₂₁ at the start timing of the polling period τ _p . The signal S ₂₁ is generated by the transmission signal generation circuit 203, and includes the mixing circuit 202, the transmission circuit 18, and the switch 2.
0 to the communication line 13.

The signal S ₂₁ from the communication line 13 is taken into the first electronic device 11 after _a time τ _a , and is input to the reception signal processing circuit 104 via the switch 16 and the reception circuit 15. When it is determined that the received signal is the signal S ₂₁ , the control signal S _c1 is sent to the control circuit 17 and the switch 16
To the transmission circuit 14 side. At the same time, the transmission signal generation circuit 101 is activated, and the signal ₁₂ is transmitted to the communication line 13 via the mixing circuit 103, the transmission circuit 14, and the switch 16.

In the second electronic device 12, after a time τ _b , the signal ₁₂ from the communication line 13 is switched to the switch 20 and the receiving circuit 19.
Is received by the reception signal processing circuit 201 via the After receiving signal processing circuit 201 which processes the signal _12, simultaneously with the start of power supply request signal generation circuit 204 sends a control signal Sc ₂ to the control circuit 21 switches the switch 20 to the transmitting circuit 18 side. Thus, the output power supply request signal S _pr from the power supply request signal generating circuit 204 is sent period tau _spr to the communication line 13.

In the first electronic device 11, the power supply request signal _Spr is received via the switch 16 and the receiving circuit 15, and when it is determined that the received signal is _Spr , the power signal generation circuit 102 The switch 16 is switched to the transmission circuit 14 by transmitting the signal S _c1 , the power signal generation circuit 102 is activated to generate a power signal _Sp, and is output to the transmission circuit 14 through the mixing circuit 103. The power signal _Sp is transmitted to the communication line 13 via the switch 16. In the second electronic device 12, the power signal S _p which is received through the communication line 13 via the switch 20 is applied to the rectifying and charging circuit 22, and generates a DC voltage by rectifying the power signal S _p, the charging circuit Is set to a predetermined output voltage. The output voltage of the rectifying / charging circuit 22 causes the secondary battery 23
Is charged.

Power supply request signal from second electronic device 12
No. S_prOf the polling period τ _pAt τ_spgof
Performed multiple times over a period. This allows rectification and charging
The electric circuit 22 can sufficiently charge the secondary battery 23.
And the power supply to the second electronic device 12 is
There will be no shortage. At this time, the rectification and charging circuit 2
2, the power signal S_pNot only that, the signal S
₁₂Is also rectified and charged, and the rechargeable battery 23 is charged.
Used for electricity.

[0022] in FIG. 2 (b) shows a second example of a transmission pattern of the power supply request signal S _pr and the power signal S _p. The transmission of the power supply request signal _Spr from the second electronic device 12 is 1
Times of only one time and the polling period tau _p, the power signal S _p is output continuously in polling period tau time to near end tau _sp by _p. As a result, the rectified output of the rectifying / charging circuit 22 is continuously obtained, so that a more sufficient charged output can be obtained as compared with the case of FIG.

Any of the methods shown in FIGS. 2A and 2B may be used. Since in the case of Figure 2 (a) is the generation cycle of the power signal S _p short, so that the input of the rectifier-charger circuit 22 can be input AC signal only make a DC by the rectifier voltage. However, in the case of FIG. 2B, since the power signal _Sp is output continuously for a long time, when the power signal _Sp is transmitted in the form of an unmodulated DC voltage, the received signal is converted to a capacitor. No rectified output can be obtained in the configuration in which the rectification and charging circuit 22 takes in the rectification and charging circuit 22 via the. In this case, the power signal _Sp may be modulated, or a signal form that continuously outputs short-period pulse signals may be used. Although the above description is based on the request signal from the second electronic device, the first device unilaterally transmits the signal between the first and second electronic devices as long as the signal is not hindered. The power signal _Sp may be transmitted.

Next, an application example of the power supply system according to the present invention will be described. FIG. 3 shows an example of a communication system in which a plurality of slave stations are connected to one master station for transmitting and receiving signals via one shared line 30. (A) of FIG.
Slave station to common line 30 connected to the 1 32 _-1, 32 _-2 ·
· 32 _-n are connected, S is from the slave station 32 _-1 to 32 _{-n ua1}
~ _Suan signal is sent out, and the master station 31 sends a slave station 32 _{-1
Signals of} S _{da1 to} S _dan are transmitted to _{.about.32 -n} .
Communication between the master station 31 and the slave stations 32-1 to 32 _{- n} cannot be performed simultaneously, but is performed in chronological order. Slave station 32 _{-1 to} 3
2 to each _-n, the power supply circuit 33 _-1, 33 _-2, ... 3
3- _n are connected, and power is individually supplied.

In the configuration of FIG. 3A, as shown in FIG. 3B, signals S _da1 to S _da1 transmitted from the master station 31 are _output .
S _dan is changed to signals S _{db1 to} S _dbn , and the slave stations 32 _-1 to 32 _{-1 to} 3
Signals S _{ua1 to} S _uan transmitted from 2- _n are converted to signals S _ub1 to S _ub1 .
There may be a request to change to _Subn . For example,
While using a slave station such as a remote controller based on a polling method using a wire line as it is, the wire line is connected to an optical fiber or wireless transmission means (for example, transmission means using infrared rays, radio waves, ultrasonic waves, or the like), or This is the case when you want to change to a different line (dedicated line, public line, etc.).
For such requirement, if the slave station 32 _-1 to 32 _-n could not corresponding, when you try to corresponding not replace the slave station 32 _-1 to 32 _-n, for performing signal conversion, the system It may not be possible to cope without making a change to add an additional device. Also, it may be difficult for the additional device to secure a dedicated power supply, and it may be necessary to receive power supply from another device.

FIG. 4 is a schematic diagram showing a signal converting means.
The present invention adapted to correspond to FIGS. 3A to 3B
Here is an application example of. Shared line 30 and child station 32_-1~ 32_-nof
Between them, the signal converter 34 _-1~ 34_-nContact
Has been continued. This signal converter 34_-1~ 34_-nFigure 1
And the slave station 32_-1~ 3
2_-nCorresponds to the first electronic device 11 in FIG. Signal conversion
Device 34_-1~ 34_-nIs the signal S from the master station 31_da1~ S
_{da n}To the signal S_db1~ S_dbnConverted to slave station 32_-1~ 32
_-nTo the slave station 32_-1~ 32_-nSignal S from_ua1~ S
_uanTo the signal S_ub1~ S_ubnAnd send it to master station 31
You. Here, the signal conversion device 34_-1~ 34_-nPower circuit
Is not connected, so the above-described method of the present invention
Slave station 32_-1~ 32_-nPower from the signal from the
You. And child station 32_-1~ 32_-nEach is a power signal
S_pIs transmitted to the first electronic device 11 of FIG.
It is equipped with each circuit of the warehouse. Further, the signal conversion device 34_-1~
34_-nEach of the slave stations 32_-1~ 32_-nEach of
Power signal S_pPower supply request to make a request to send
Request signal S_prIs transmitted, the second configuration of the configuration shown in FIG.
The electronic device 12 includes various circuits built therein.

FIG. 5 shows the signal transmission of the system of FIG.
For example, when the master station 31 receives the signal S_dbnTo the shared line 30
If this signal S_dbnIs a signal converter 34_-nReceived at
Be trusted. Signal converter 34_-nIs the signal S_dbnTo the signal S
_danTo the slave station 32_-nSend to Signal S
_danTo the signal converter 34_-nSlave station 32 received from_-nIs
Signal converter 34_-nSignal S towards_uanIs sent. This
Signal S_uanSignal converter 34 that has received_-nIs the signal S
_uanTo the signal S_ubnAnd sent to the shared line 30
Later, child station 32_-nPower supply request signal S toward_prSend out
You. Slave station 32_-nIs a signal conversion device 34_-nPower supply from
Request signal S_prIs received, the signal conversion device 34_-nPower
Signal S_pIs sent. This signal converter 34_-nAnd child station 3
2_-nPower supply request signal S during_prAnd power signal S_pSending and receiving
The signal is received when a signal from the master station 31 to the own station is received.
Only the points are interrupted and otherwise continued. Since then
Similarly, the signal changes until the next transmission from the master station 31.
The slave station 32, which has received the signal from the switching device 34,
S_uaAnd a power supply request signal S_prAccording to
Force signal S_pIs sent. Signal converter 34 _-1~ 34_-nso
Is the child station 32_-1~ 32_-nPower signal S received from_pas well as
Signal S_uaIs rectified by the rectification / charging circuit 22 and output as DC.
To generate electric power by charging the secondary battery 23,
Conversion device 34_-1~ 34_-nPower supply.

In FIG. 4, as indicated by a dotted line,
Signal converter 34 _-1 to 34 power circuit _-n 35 _-1 to 35 _-n
, The power supply system can be duplicated, the stability is improved even when the power consumption of the signal converters 34 _{-1 to} 34 _-n is large, and the reliability of the power supply can be improved. Further, the rectifying / charging circuit 22 may have a configuration including a booster circuit using an inverter. Further, the configuration in which the power supply circuits 35 _{-1 to} 35 _-n of FIG. 4 are provided is also applicable to the second electronic device 12 shown in FIG.

[0029]

As described above, according to the power supply system of the present invention, when communication is not performed, the power supply request signal generation circuit of the second electronic device sends the power signal to the first electronic device. Transmit a power supply request signal requesting transmission of
In response to this request, the first electronic device sends a power signal to the second electronic device. Therefore, even when performing polling communication with a long cycle, a separate external power supply circuit or the like must be provided on the receiving side. Power supply is possible. If a power supply system is separately provided on the receiving side to duplicate the power supply system, the reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a power supply method according to the present invention.

FIG. 2 is a timing chart illustrating two examples of signal transmission between a first electronic device and a second electronic device in FIG. 1;

FIG. 3 is a block diagram illustrating a configuration example of a system that is a premise of an application example of the present invention.

FIG. 4 is a block diagram of a system showing an application example of the present invention.

FIG. 5 is a timing chart showing signal transmission of the system of FIG. 4;

FIG. 6 is a block diagram showing two examples of a conventional power supply system.

FIG. 7 is a block diagram showing another conventional power supply method.

8 is a timing chart showing signal transmission in the power supply system of FIG.

[Explanation of symbols]

5, 33 _{-1 to} 33 _-n , 35 _{-1 to} 35 _-n Power supply circuit 11 First electronic device 12 Second electronic device 13 Communication line 14, 18 Transmission circuit 15, 19 Receiving circuit 16, 20, Switch 17, REFERENCE SIGNS LIST 21 control circuit 22 rectifying / charging circuit 23 secondary battery 30 shared line 31 master station 32 _{-1 to} 32 _-n slave station 34 _{-1 to} 34 _-n signal conversion device 101, 203 transmission signal generation circuit 102 power signal generation circuit 103 , 202 mixing circuit 104 and 201 receive the signal processing circuit 204 power supply request signal generation circuit S _p power signal S _pr power supply request signal

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Atsushi Ishikawa 5-2-1 Ebara, Shinagawa-ku, Tokyo F-term in Saneisha Works (reference) 5K046 AA03 CC17 PS31 PS41 YY01 5K048 AA06 BA01 CA03 DC06 HA04 HA06 HA36

Claims (3)

[Claims] A first electronic device that operates by receiving a power supply from an external power supply circuit and a second electronic device that operates by a chargeable power supply provided therein, connected by a transmission line; A power source for communicating between the first and second electronic devices via a transmission line and charging the rechargeable power source of the second electronic device from the first electronic device via the transmission line In the supply method, the first electronic device transmits a power signal for charging the rechargeable power supply when communication is not performed between the first electronic device and the second electronic device, in addition to a communication signal. A power signal generating circuit that generates, and a transmitting and receiving circuit that transmits the power signal via the transmission line and receives a transmission signal transmitted from the second electronic device, wherein the second electronic device includes: The first electronic device A circuit for receiving a power signal from the first electronic device to charge a rechargeable power supply when communication is not being performed, transmitting a transmission signal to the first electronic device, and transmitting the transmission signal to the first electronic device. A power supply method comprising a transmission / reception circuit for receiving a transmission signal transmitted from an electronic device and the power signal. 2. A means for supplying power to a second electronic device when no communication is performed between the first electronic device and the second electronic device, based on a request signal from the second electronic device. 2. The power supply system according to claim 1, wherein one electronic device transmits a power signal. 3. The power supply according to claim 1, wherein the second electronic device is connected to a second power supply circuit different from a power supply circuit supplied via the transmission line. Supply method.