JP2004023975A - Power supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To charge a secondary battery automatically without a troublesome charging operation of taking out the secondary battery from an apparatus and setting it on the charging stage during the charging with respect to an electronic apparatus or an electric apparatus driven by both the commercial power supply or the secondary battery. <P>SOLUTION: The power supply device includes a power supply circuit 11 driven by a commercial power supply in the main body of the apparatus or in the system; a chargeable secondary battery 12; and a charging circuit 15 for charging the secondary battery through an output of the power supply circuit. When the apparatus is driven by the power supply circuit 11 with an AC power supply from outside, the secondary battery 12 is charged with the charging circuit 15 concurrently. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power supply device, and more particularly to a power supply device including a power supply circuit driven by a commercial power supply and a rechargeable secondary battery.
[0002]
[Prior art]
Various electronic and electrical devices require a power supply. As such a power supply, electric power supplied from outside such as a commercial power supply is applied to a built-in power supply circuit, and a predetermined power supply is obtained by the power supply circuit. In the case of a portable electronic device or electric device, since a commercial power supply cannot be used directly, a rechargeable secondary battery is provided and driven by the output of the secondary battery.
[0003]
[Problems to be solved by the invention]
Generally, a portable electronic device is driven using a battery. In particular, when a secondary battery is used, it is possible to repeatedly charge the secondary battery. However, the conventional power supply including a secondary battery requires a dedicated external charger that is easily separated from the electronic device when the battery is discharged, and charges the battery by mounting the discharged secondary battery in the external charger. Like that. Therefore, there is a disadvantage that a charger, which is another device, is required in addition to the electronic device or the electric device main body.
[0004]
Some devices have a power supply circuit for driving using an AC power supply together with a secondary battery. However, in general, when an AC power supply is used, the device is driven by a power supply circuit independent of the secondary battery. become. That is, the AC power supply and the secondary battery are used separately and independently, and the secondary battery cannot be charged as required when driven using the AC power supply.
[0005]
The present invention has been made in view of such a problem, and in a power supply device that uses a power supply circuit driven by a commercial power supply and a rechargeable secondary battery in combination, in particular, the secondary battery is discharged. It is an object of the present invention to provide a power supply device that can charge a secondary battery by an output of a power supply circuit of a commercial power supply without requiring a charger composed of a device different from a main body in such a case.
[0006]
[Means for Solving the Problems]
The main invention of the present application is
A power supply circuit driven by a commercial power supply;
Rechargeable secondary battery,
A charging circuit that charges the secondary battery with an output of the power supply circuit;
A switching circuit for selectively switching between the output of the power supply circuit and the output of the secondary battery and supplying the output to a load;
Wherein the charging circuit is capable of charging the secondary battery by an output of the power supply circuit.
[0007]
Here, the switching circuit may be configured by a diode, and the output terminal of the secondary battery and the output terminal of the power supply circuit may be connected to an anode and a cathode of the diode, respectively. It is also possible to connect a resistor constituting a charging circuit in parallel with the diode.
[0008]
Another main invention of the present application is
A power supply circuit driven by a commercial power supply;
Rechargeable secondary battery,
A quick charging circuit for rapidly charging the secondary battery by an output of the power supply circuit;
A trickle charging circuit that slowly charges the secondary battery with an output of the power supply circuit;
A switching circuit for selectively switching between the output of the power supply circuit and the output of the secondary battery and supplying the output to a load;
Control means for switching between the quick charging circuit, the trickle charging circuit, and the switching circuit;
Wherein the charging circuit is capable of charging the secondary battery by an output of the power supply circuit.
[0009]
Here, it is preferable that the secondary battery is composed of a plurality of cells connected in parallel to each other, and each cell is connected to the quick charging circuit and the trickle charging circuit. Preferably, a discharge circuit is connected to the secondary battery, and when there is a memory effect, the discharge circuit completely discharges the secondary battery.
[0010]
Yet another major invention of the present application is
A power supply circuit driven by a commercial power supply;
Rechargeable secondary battery,
A charging circuit that charges the secondary battery with an output of the power supply circuit;
A switching circuit for selectively switching between the output of the power supply circuit and the output of the secondary battery and supplying the output to a load;
Detecting means for detecting a current flowing when driving a load by the power supply circuit;
Control means for controlling the charging circuit according to the detection of the detection means,
The present invention relates to a power supply device provided with:
[0011]
Here, when the load is being driven by the power supply circuit, the control means can supply the surplus current to the charging circuit to charge the secondary battery. Further, the detection means may include a detection resistor connected in series between the power supply circuit and the switching circuit, and the current may be detected by a voltage drop of the detection resistor.
[0012]
A preferred embodiment of the invention included in the present application is a built-in AC power supply, a rechargeable secondary battery, and a charging function, which can be operated by a commercial power supply or a secondary battery, and furthermore, the main body is operated while charging. It is something that can be done.
[0013]
According to such an embodiment, it is possible to operate with a commercial power supply or a secondary battery, and to charge the battery while using it. Since all of the devices are built-in all-in-one, the user can use the secondary battery. It can be used both indoors and outdoors without preparing a device for charging the battery, or conscious of complicated auxiliary means such as an AC adapter. It can also be used in places where a commercial power supply is not always available, such as outdoors or travel. In some cases, if a commercial power source can be secured, immediate charging will be performed automatically on the spot.
[0014]
In a general portable electronic device, both a secondary battery and an AC adapter operate, but a dedicated charger is conventionally required for charging the secondary battery. A boombox or the like is operated by both a commercial power supply and a secondary battery, but has no built-in charging function. Furthermore, in the case of home audio equipment and the like, it operates only with a commercial power supply.
[0015]
In view of such problems, the present invention incorporates a power supply circuit driven by a commercial power supply in a device or a device main body, a secondary battery, and a charging function of the secondary battery, and is used for travel, camping, and outdoor use. It operates even when the commercial power source cannot be used freely, such as when the power source is available. In addition, when the commercial power source is present, the quick charging of the secondary battery and the operation by the secondary battery are enabled. This provides an AV device that can be freely enjoyed outside without worrying about deterioration in functions, sound quality, and image quality. At home, it can be used as ordinary AV equipment. In addition, when AC power can be used as it is when traveling to an inn or a hotel, for example, during a trip, when the AC power is supplied, the internal secondary battery is rapidly charged and can be used for a long time. Also, in the case of audio equipment, the battery has better sound quality and can supply power from the battery when a large load is applied to the power supply. Occurs.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
(1) Embodiment 1 (FIGS. 1 and 2)
In this embodiment, as shown in FIG. 1, for example, a power supply circuit 11 to which a commercial power supply of AC 100 V is supplied, a rechargeable secondary battery 12, and a switching circuit for switching between the power supply circuit 11 and the secondary battery 12 And a charging circuit 15 for charging the secondary battery 12 with the output of the power supply circuit 11.
[0017]
Therefore, according to such a power supply device, the main circuit 14 constituting the load is selectively driven by the AC power supply circuit 11 and the secondary battery 12 according to the switching of the switching circuit 13. Therefore, it can be driven by any power supply as needed. Moreover, the feature of this device is that the charging circuit 15 is built-in, and when the AC power is supplied to the AC power supply circuit section 11 and the secondary battery 12 is not fully charged. Can be charged by the charging circuit 15.
[0018]
Therefore, according to such a power supply device, when either the AC power supply circuit 11 or the secondary battery 12 drives the main circuit 14, the secondary battery 12 can be charged while being used. Also, there is no need for a charging stand or an AC adapter which is a separate device for charging the secondary battery 12. That is, since all are all-in-one, the user can automatically charge the secondary battery 12 without worrying about the charging stand, the AC adapter, and the like. In addition, in the case where the secondary battery 12 is driven outdoors, if the AC power supply can be ensured, the secondary battery 12 can be rapidly charged on the spot. As a result, the secondary battery 12 can be used for a long time.
[0019]
FIG. 2 shows a specific configuration of the power supply circuit shown in FIG. The power supply circuit 11 includes a single-phase full-wave rectifier 19 having a transformer 18 and four diodes assembled in a bridge, and a smoothing capacitor 20 for smoothing the output of the rectifier 19. The power supply circuit 11 and the secondary battery 12 are connected to each other via a diode 13 constituting a switching circuit. The diode 13 has an anode connected to the positive electrode of the secondary battery 12 and a cathode connected to the output terminal of the power supply circuit 11. Further, a pair of resistors 21 and 22 are connected in parallel to the diode 13 constituting the switching circuit. The resistor 21 is a resistor having a small resistance value and forms a quick charging circuit. On the other hand, the resistor 22 is a resistor having a large resistance value and constitutes a trickle charging circuit that charges slowly. The pair of resistors 21 and 22 are switched by a switch 27.
[0020]
For example, the audio amplifier 23 is driven by the power supply circuit 11 or the secondary battery 12. The amplifier 23 amplifies the signal applied to the input terminal 24 and drives the speaker 26 by the coil 25. Therefore, the speaker 26 is driven by either the power supply circuit 11 or the secondary battery 12. Since the switching of the two power supplies is performed by the diode 13, the operation for the switching operation is not required.
[0021]
(2) Embodiment 2 (FIGS. 3 and 4)
This embodiment is a power supply device for selectively driving a load 14 by a power supply circuit 11 and a pair of secondary batteries 31 and 32. That is, here, a cell A31 and a cell B32 are prepared as secondary batteries. These secondary batteries 31 and 32 are connected to a quick charging circuit 33 and a trickle charging circuit 34, respectively. Further, this power supply device includes a microcomputer 35, which controls switching of the cells 31 and 32 charged by the quick charging circuit 33 and the trickle charging circuit 34, respectively. The microcomputer 35 switches the switching circuit 13 composed of a switching switch. The switching circuit 13 is for switching between the power supply circuit 11 and the secondary batteries 31 and 32. The power supply device further includes a discharge resistor 36 for completely discharging the secondary batteries 31 and 32, and is selectively connected to the pair of secondary batteries 31 and 32 by a changeover switch 37. .
[0022]
FIG. 4 shows the control operation of such a power supply device by the microcomputer 35. The microcomputer 35 determines whether or not the AC power supply is ON from the output of the power supply circuit 11, and drives the load 14 by the secondary batteries 31 and 32 when the AC power supply is not ON. At this time, the microcomputer 35 switches the switching circuit 13 and drives the load 14 while monitoring the voltages of the cells 31, 32 so that the pair of secondary batteries 31, 32 is not over-discharged. Therefore, in this case, the load 14 is driven by one of the pair of secondary batteries 31 and 32. If the secondary batteries 31 and 32 have a memory effect, that is, if a history due to incomplete discharge remains, the changeover switch 37 is switched, and the used cell 31 or 32 is connected to the discharge resistor 36 to complete the discharge. Perform discharge. This prevents a reduction in the charge capacity of the secondary batteries 31 and 32.
[0023]
When the microcomputer 35 detects the output voltage of the power supply circuit 11, that is, when the AC power supply is ON, it is determined whether or not the cells 31, 32 are fully charged, and one or both of the secondary batteries 31, 32 are determined. If is not fully charged, the undercharged cells are rapidly charged. At this time, the quick charging circuit 33 is operated. On the other hand, when one or both of the secondary battery cells 31 and 32 are fully charged, the trickle charging circuit 34 slowly trickle charges the secondary batteries 31 and 32 and switches the switching circuit 13 to the AC power supply circuit 11. To drive the load 14.
[0024]
Therefore, even in such a power supply device, the secondary batteries 31 and 32 can be charged at the same time when the load 14 is driven by the AC power supply. In addition, such charging is performed by quick charging or trickle charging depending on the state of the secondary batteries 31 and 32. When the secondary batteries 31 and 32 have a memory effect, the discharged secondary batteries 31 and 32 are completely discharged by the discharge resistor 36, and the memory effect can be eliminated.
[0025]
(3) Embodiment 3 (FIGS. 5 and 6)
In this embodiment, as shown in FIG. 5, a load 14 is selectively driven by an AC power supply 11 and a secondary battery 12, and a switching circuit 13 is connected between the AC power supply 11 and the load 14. Is done. Further, a detection resistor 41 is connected in series between the AC power supply 11 and the switching circuit 13. Both ends of the detection resistor 41 are connected to a pair of input terminals of a differential amplifier 42, and the differential output of the differential amplifier 42 is input to the microcomputer 43. The microcomputer 43 controls the charge control circuit 15. That is, the charge control circuit 15 is connected between the AC power supply 11 and the secondary battery 12.
[0026]
FIG. 6 shows the control operation of the microcomputer 43. Here, when AC power is being applied to the power supply circuit 11, the microcomputer 43 detects whether the secondary battery 12 is fully charged. If the battery is fully charged, the charging is stopped. On the other hand, when the battery is not fully charged, that is, when the voltage is low, the secondary battery 12 is charged by the surplus current. In this charging operation, a current flowing from the AC power supply circuit 11 to the load 14 through the switching circuit 13 is detected by a voltage drop of the resistor 41, and this voltage drop is input to the microcomputer 43 by the differential amplifier 42, and the microcomputer 43 The control is performed by controlling the charge control circuit 15 in accordance with the output voltage of. That is, when the load 14 is driven by the AC power supply circuit 11, the secondary battery 12 is driven by the charge control circuit 15 by using the surplus current of the AC power supply circuit 11. When the secondary battery 12 is charged by the charge control circuit 15 to be fully charged, the charging is stopped here.
[0027]
Even in such a power supply device, when the load 14 is driven by the power supply circuit 11 using a commercial power supply, the rechargeable battery 12 can be charged using the excess current generated in the AC power supply circuit 11. This makes it possible to relieve the trouble of removing the secondary battery 12 and installing it on a charging stand composed of another device to perform charging. Alternatively, when driven by the power supply circuit 11, there is no need to connect a power supply device such as an AC adapter. That is, since the power supply circuit 11, the secondary battery 12, and the charging circuit 15 are built in the device or the device while being connected to each other, the user is conscious of a complicated auxiliary tool such as a charging device or an AC adapter. It can be used both indoors and outdoors. When the load 14 is driven by the secondary battery 12 and the AC power supply can be used by chance, the secondary battery 12 is charged simultaneously on the spot, thereby shortening the battery life. Will be extended.
[0028]
Although the invention included in the present application has been described with reference to the illustrated embodiment, the invention of the present application is not limited to the above embodiment, and various changes can be made within the technical idea of the invention included in the present application. It is. For example, the above embodiment is applied to AV equipment such as an audio device, but the present invention can be widely used for various other electronic equipment or electric equipment. Further, the specific circuit configuration is not limited to the above embodiment, and various other circuit configurations can be adopted.
[0029]
【The invention's effect】
The main invention of the present application is a power supply circuit driven by a commercial power supply, a rechargeable secondary battery, a charging circuit for charging the secondary battery by an output of the power supply circuit, an output of the power supply circuit, and an output of the secondary battery. And a switching circuit that selectively switches between the two and supplies the load to the load, so that the charging circuit can charge the secondary battery by the output of the power supply circuit.
[0030]
Therefore, according to such a power supply device, when the secondary battery is discharged, it is not necessary to remove the secondary battery from the device and install it on the charging stand to perform charging.
[0031]
Another main invention of the present application is a power supply circuit driven by a commercial power supply, a rechargeable secondary battery, a quick charging circuit for rapidly charging the secondary battery by an output of the power supply circuit, and a power supply for the secondary battery. A trickle charging circuit that charges slowly by an output of a circuit, a switching circuit that selectively switches between an output of a power supply circuit and an output of a secondary battery and supplies the load, a quick charging circuit, a trickle charging circuit, and a switching circuit. Control means for switching, so that the charging circuit can charge the secondary battery by the output of the power supply circuit.
[0032]
Therefore, according to such a power supply device, the secondary battery is automatically charged when the load is driven by using the power supply circuit driven by the commercial power supply. Release from charging operation. In addition, the control means can selectively use the quick charging circuit and the trickle charging circuit to perform charging, whereby the secondary battery is properly charged.
[0033]
Still another main invention of the present application is a power supply circuit driven by a commercial power supply, a rechargeable secondary battery, a charging circuit for charging the secondary battery with an output of the power supply circuit, an output of the power supply circuit and a secondary A switching circuit for selectively switching the output of a battery and supplying the load to a load; a detection unit for detecting a current flowing when the load is driven by a power supply circuit; and a control unit for controlling a charging circuit in accordance with the detection of the detection unit And
[0034]
Therefore, according to such a power supply device, the charging circuit is controlled according to the current detected by the detecting means, and the secondary battery is charged by effectively using the surplus current of the power supply circuit.
[Brief description of the drawings]
FIG. 1 is a block diagram of a power supply device according to a first embodiment.
FIG. 2 is a circuit diagram of the power supply device.
FIG. 3 is a block diagram of a power supply device according to a second embodiment.
FIG. 4 is a flowchart showing a control operation of the power supply device.
FIG. 5 is a block diagram of a power supply device according to a third embodiment.
FIG. 6 is a flowchart showing a control operation of the power supply device.
[Explanation of symbols]
11 power supply circuit, 12 rechargeable battery, 13 switching circuit, 14 body circuit (load), 15 charging circuit, 18 transformer, 19 single-phase full-wave rectifier, 20 {Condenser, 21} Resistance (for quick charge), 22} Resistance (for trickle charge), 23} Amplifier, 24} Input terminal, 25} Coil, 26} Speaker, 27} Changeover switch, 31 ‥‥ secondary battery cell A, 32 ‥‥ secondary battery cell B, 33 ‥‥ quick charge circuit, 34 ‥‥ trickle charge circuit, 35 ‥‥ microcomputer, 36 ‥‥ discharge resistor, 37 ‥‥ changeover switch, 41 ‥‥ detection resistor, 42 ‥‥ differential amplifier, 43 ‥‥ microcomputer

Claims (9)

A power supply circuit driven by a commercial power supply;
Rechargeable secondary battery,
A charging circuit that charges the secondary battery with an output of the power supply circuit;
A switching circuit for selectively switching between the output of the power supply circuit and the output of the secondary battery and supplying the output to a load;
Wherein the charging circuit can charge the secondary battery by an output of the power supply circuit. The power supply device according to claim 1, wherein the switching circuit includes a diode, and an output terminal of the power supply circuit and the secondary battery are connected to an anode and a cathode of the diode, respectively. 3. The power supply device according to claim 2, wherein a resistor constituting a charging circuit is connected in parallel with the diode. A power supply circuit driven by a commercial power supply;
Rechargeable secondary battery,
A quick charging circuit for rapidly charging the secondary battery by an output of the power supply circuit;
A trickle charging circuit that slowly charges the secondary battery with an output of the power supply circuit;
A switching circuit for selectively switching between the output of the power supply circuit and the output of the secondary battery and supplying the output to a load;
Control means for switching between the quick charging circuit, the trickle charging circuit, and the switching circuit;
Wherein the charging circuit can charge the secondary battery by an output of the power supply circuit. The power supply device according to claim 4, wherein the secondary battery includes a plurality of cells connected in parallel with each other, and each cell is connected to the quick charging circuit and the trickle charging circuit. The power supply device according to claim 4, wherein a discharge circuit is connected to the secondary battery, and the secondary battery is completely discharged by the discharge circuit when there is a memory effect. A power supply circuit driven by a commercial power supply;
Rechargeable secondary battery,
A charging circuit that charges the secondary battery with an output of the power supply circuit;
A switching circuit for selectively switching between the output of the power supply circuit and the output of the secondary battery and supplying the output to a load;
Detecting means for detecting a current flowing when driving a load by the power supply circuit;
Control means for controlling the charging circuit according to the detection of the detection means,
Power supply device comprising: 8. The power supply device according to claim 7, wherein when the load is being driven by the power supply circuit, the control unit charges the secondary battery by flowing an excess current to the charging circuit. 9. 8. The apparatus according to claim 7, wherein said detecting means comprises a detecting resistor connected in series between said power supply circuit and said switching circuit, and detects a current by a voltage drop of said detecting resistor. Power supply.

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