JP2022172556A - Power supply device and voltage-generating circuit - Google Patents

Abstract

To provide a power supply device and a voltage-generating circuit capable of extending the service life of a battery used in a power supply device or the like.SOLUTION: A power supply device 1 includes a battery, a DC/AC converter 20, a voltage generating circuit 30, and a feedback circuit 50. The DC/AC converter converts a DC voltage supplied from the battery to an AC voltage. The voltage-generating circuit is connected to an output terminal of the DC/AC converter and generates a DC voltage by converting an AC voltage to a DC voltage. The feedback circuit returns the output of the voltage-generating circuit to a rechargeable battery 10.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to power supply devices and voltage generation circuits.

Devices and power supply devices that use rechargeable batteries or dry batteries require periodic charging of the rechargeable batteries or replacement of the dry batteries. Therefore, it is difficult to use this type of equipment continuously for a long period of time, and in order to use the equipment for a long period of time, it is necessary to prepare a plurality of dry batteries or storage batteries in advance. Therefore, various techniques have been proposed for extending the battery life (see, for example, Patent Document 1).

JP-A-2008-135193

However, with the technology disclosed in Patent Document 1, it is difficult to use the technology for general-purpose rechargeable batteries and dry batteries because it is necessary to attach the sheet to the battery.

SUMMARY OF THE INVENTION It is an object of the present invention to extend the life of a battery used in a power supply device or the like regardless of the battery type.

In order to solve the above problems, a power supply device according to an embodiment includes a battery, a DC/AC converter, a voltage generation circuit, and a feedback circuit. A DC/AC converter converts a DC voltage supplied from a battery into an AC voltage. The voltage generation circuit is connected to the output terminal of the DC/AC converter and generates a DC voltage by converting an AC voltage into a DC voltage. The feedback circuit feeds back the output of the voltage generation circuit to the battery.

1 is a configuration diagram of a power supply device according to Embodiment 1. FIG. 2 is a configuration diagram of a voltage generation circuit according to Embodiment 1; FIG. 4A and 4B are diagrams for explaining the operation of the power supply device according to the first embodiment; FIG. 4A and 4B are diagrams for explaining the operation of the power supply device according to the first embodiment; FIG.

(Embodiment 1)
Hereinafter, this embodiment will be described with reference to the drawings. FIG. 1 is a configuration diagram of a power supply device 1 according to an embodiment. The power supply device 1 has a battery 10 , a switch 11 , a DC/AC converter 20 , a voltage generation circuit 30 , a reverse blocking diode 40 and a feedback circuit 50 .

Battery 10 is, for example, a rechargeable lead acid battery or a lithium ion battery. Here, the battery 10 is configured by connecting ten lithium-ion batteries with an output of 1.5V in series. The switch 11 is a switch for opening and closing the output of the battery 10 and for turning on/off the power supply device 1 .

DC/AC converter 20 converts the DC voltage output from battery 10 into an AC voltage. The DC/AC converter 20 is a switching regulator type converter. For example, the output voltage of DC/AC converter 20 is 1 kilovolt or more. Here, the output voltage of DC/AC converter 20 is approximately 400,000 volts. The switching frequency of the DC/AC converter 20 is, for example, several tens of kHz. The DC/AC converter 20 has terminals T1 and T2 to which external devices are connected.

The voltage generation circuit 30 is connected to a terminal T1 provided in the DC/AC converter 20. As shown in FIG. FIG. 2 is a configuration diagram of the voltage generation circuit 30. As shown in FIG. The voltage generating circuit 30 has a diode 31 (first rectifying element), a diode 32 (second rectifying element), a transformer 33 , a diode 34 and a capacitor 35 .

The anode of the diode 31 and the cathode of the diode 32 are connected to the terminal T1. A primary winding of a transformer 33 is connected to the cathode of the diode 31 and the anode of the diode 32 . A diode 34 is connected in series and a capacitor 35 is connected in parallel to the secondary winding of the transformer 33 . Diode 34 and capacitor 35 form a smoothing circuit.

1 and 2, the high voltage end of the secondary winding of transformer 33 is connected to the anode of battery 10 via reverse blocking diode 40, which is connected in series with diode 34, and switch 11. connected to The low-voltage end of the secondary winding of transformer 33 is connected to the negative electrode of battery 10 . Thus, the voltage generation circuit 30 and the reverse current blocking diode 40 constitute the feedback circuit 50 .

When a voltage is generated on the secondary side of the transformer 33 that constitutes the voltage generation circuit 30 , current flows from the voltage generation circuit 30 toward the anode of the battery 10 via the reverse current blocking diode 40 that constitutes the feedback circuit 50 .

Next, operation of the power supply device 1 will be described. By turning on the switch 11 , a DC voltage of about 15 V is input from the battery 10 to the DC/AC converter 20 . DC/AC converter 20 outputs an alternating voltage of approximately 400,000 volts between terminals T1 and T2.

FIG. 3 is an equivalent circuit of the voltage generation circuit 30. As shown in FIG. A stray capacitance C1 exists between the primary windings of the transformer 33 . A stray capacitance C2 exists between the primary winding of the transformer 33 and the terminal T2. A stray capacitance exists between each part of the primary winding of the transformer 33 and the terminal T2. Assuming that the capacitance is large, the description will be made assuming that only the stray capacitance C2 exists.

DC/AC converter 20 outputs an alternating voltage between terminals T1 and T2. When the potential of the terminal T1 is higher than the potential of the terminal T2, as indicated by the dotted line in FIG. A loop is formed. This current generates a voltage across the primary winding of the transformer 33 . Also, the floating capacitance C1 is charged.

When the potential of the terminal T1 is lower than the potential of the terminal T2, a current loop is formed through the terminal T2, the stray capacitance C2, the diode 32, and the terminal T1. At this time, since the diode 31 exists, no current flows through the primary winding of the transformer 33 and the stray capacitance C1. The charge charged in the stray capacitance C1 is discharged through the primary winding of the transformer 33. FIG. With the discharge, the voltage across the primary winding of transformer 33 and stray capacitance C1 decreases.

When the potential of the terminal T1 becomes higher than the potential of the terminal T2 again, a current loop indicated by the dotted line in FIG. Thus, an AC voltage is generated on the primary side of the transformer 33 as the voltage between the output terminals of the DC/AC converter 20 changes.

On the secondary side of the transformer 33 , an alternating voltage is generated by stepping up or stepping down the alternating voltage generated on the primary side of the transformer 33 . A diode 34 and a capacitor 35 smooth the AC voltage generated on the secondary side of the transformer 33 to generate a DC voltage. The turns ratio between the primary winding and the secondary winding of the transformer 33 is set so that the DC voltage V2 output between the positions P3 and P4 is slightly higher than the voltage V1 across the battery 10. . Assume that the output voltage of the battery 10 when fully charged is 16.5V, and the minimum voltage required for an electronic device (load circuit) using the power supply device 1 is 13.5V. In this case, the turns ratio of the transformer 33 is set such that the DC voltage V2 between the positions P3 and P4 is, for example, 16.0V to 16.5V.

When the DC voltage V2 between the positions P3 and P4 is higher than the voltage V1 across the battery 10, power is supplied from the voltage generation circuit 30 to the battery 10 via the feedback circuit 50, and the battery 10 is charged. When the voltage V1 between the positions P1 and P2 is higher than the DC voltage V2 between the positions P3 and P4, the reverse current blocking diode 40 allows current to flow from the battery 10 to the voltage generation circuit 30 through the feedback circuit 50. it doesn't flow in.

FIG. 4 is a graph showing temporal changes in the voltage V1 across the battery 10 when a predetermined load circuit is connected between the terminals T1 and T2. The vertical axis represents the voltage V1 across the battery 10 . The horizontal axis indicates elapsed time. A curve defined by circles indicates changes in voltage V1 of battery 10 constituting power supply device 1 having feedback circuit 50 shown in FIG. A curve defined by triangle marks shows a change in the voltage V1 of the battery 10 in a conventional power supply without the feedback circuit 50. FIG.

VH in FIG. 4 is the voltage across the battery 10 when the battery 10 is fully charged. VH is, for example, 16.5V. VL is, for example, 13.5V. Time t1 is the time it takes for voltage V1 of battery 10 constituting power supply device 1 to reach VL from VH. Time t2 is the time it takes for the voltage V1 of the battery 10 constituting the conventional power supply device 1 without the feedback circuit 50 to reach VL from VH.

An experimental result was obtained that the smaller the power consumption of the load circuit connected between the terminals T1 and T2, the larger the ratio K (K=t1/t2) between the time t1 and the time t2. For example, when a load circuit with low power consumption such as an LED is connected, the value of K may be 1.2 or more.

As described above, the power supply device 1 according to the embodiment has the DC/AC converter 20, the voltage generation circuit 30, and the feedback circuit 50. The power supply device 1 charges the battery 10 by feeding back the DC voltage generated by the voltage generation circuit 30 to the battery 10 through the feedback circuit 50 . As a result, it is thought that reduction in the power accumulated in the battery 10 can be suppressed.

Further, when the load connected to the terminals T1 and T2 of the DC/AC converter 20 is inductive, the capacity of the capacitor 35 of the voltage generation circuit 30 is compared with the inductance of the winding of the transformer 33, By increasing it, the power factor on the load side from the terminals T1 and T2 to which the AC voltage is output increases. As a result, the efficiency of power transmission to the load is improved, and as a result, the voltage drop of the battery 10 can be suppressed. Further, when the load connected to the terminals T1 and T2 of the DC/AC converter 20 is capacitive, the capacitance of the capacitor 35 of the voltage generating circuit 30 is compared with the inductance of the winding of the transformer 33, By making it smaller, the power factor on the load side from the terminals T1 and T2 to which the AC voltage is output becomes higher. As a result, the efficiency of power transmission to the load is improved, and as a result, the voltage drop of the battery 10 can be suppressed.

In the above description, the case where the voltage generating circuit 30 is connected only to the terminal T1 has been described. However, the voltage generation circuit 30 may be connected to each of the terminals T1 and T2. In this case, the output of one of the voltage generation circuits 30 is fed back to the battery 10 by the feedback circuit 50 via the reverse current blocking diode 40 . Also, a load circuit with low power consumption, such as an LED, can be connected to the output of the voltage generation circuit 30 and used.

Also, in the above description, the case where the DC/AC converter 20 outputs an alternating voltage of approximately 400,000 volts has been described, but the output voltage of the DC/AC converter 20 is not limited to 400,000 volts.

The voltage applied to the primary side of the transformer 33 increases as the output voltage of the DC/AC converter 20 increases. When the output voltage of the DC/AC converter 20 is low, the output voltage of the voltage generation circuit 30 can be increased by increasing the turns ratio of the transformer 33 .

In some cases, either the diode 31 or the diode 32 of the voltage generation circuit 30 can be reduced in power or replaced with a fixed resistor.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and its equivalents.

DESCRIPTION OF SYMBOLS 1... Power supply device 10... Battery 11... Switch 20... DC/AC converter 30... Voltage generating circuit 31, 32, 34... Diode (rectifying element)
33 ... transformer (transformer)
35... Capacitor 40... Backflow blocking diode 50... Feedback circuit C1, C2... Stray capacitance

In order to solve the above problems, a power supply device according to an embodiment has a battery, a DC/AC converter, a voltage generation circuit, a feedback circuit, and a diode . A DC/AC converter converts a DC voltage supplied from a battery into an AC voltage. The voltage generation circuit is connected to the output terminal of the DC/AC converter and generates a DC voltage by converting an AC voltage into a DC voltage. A feedback circuit feeds back the output of the voltage generation circuit to the battery. A diode is provided between the battery and the voltage generation circuit to prevent current from flowing from the battery to the voltage generation circuit. The voltage generating circuit includes a first rectifying element whose anode is connected only to one of a pair of output terminals of the DC/AC converter, and a second rectifying element whose cathode is connected to the anode of the first rectifying element. , a transformer with a primary winding connected between the cathode of the first rectifying element and the anode of the second rectifying element, and a smoothing circuit connected to the secondary winding of the transformer.

In order to solve the above problems, a power supply device according to an embodiment has a battery, a DC/AC converter, a voltage generation circuit, a feedback circuit, and a diode. A DC/AC converter converts a DC voltage supplied from a battery into an AC voltage. The voltage generation circuit is connected to the output terminal of the DC/AC converter and generates a DC voltage by converting an AC voltage into a DC voltage. A feedback circuit feeds back the output of the voltage generation circuit to the battery. A diode is provided between the battery and the voltage generation circuit to prevent current from flowing from the battery to the voltage generation circuit. The voltage generating circuit includes a first rectifying element whose anode is connected only to one of a pair of output terminals of the DC/AC converter, and a second rectifying element whose cathode is connected to the anode of the first rectifying element. , a transformer with a primary winding connected between the cathode of the first rectifying element and the anode of the second rectifying element, and a smoothing circuit connected to the secondary winding of the transformer.

Claims (7)

a battery;
a DC/AC converter that converts a DC voltage supplied from the battery into an AC voltage;
a voltage generation circuit connected to an output terminal of the DC/AC converter and configured to convert an AC voltage into a DC voltage to generate a DC voltage;
a feedback circuit that feeds back the output of the voltage generation circuit to the battery;
power supply. The voltage generation circuit is
a transformer having a primary side connected to the DC/AC converter and a secondary side connected to the feedback circuit;
a smoothing circuit provided in the transformer;
The power supply of claim 1, comprising: The voltage generation circuit is
a rectifying element provided on the primary side of the transformer;
a rectifying element provided on the secondary side of the transformer;
3. The power supply of claim 2, comprising: the primary side of the transformer,
connected to only one of a pair of output terminals of the DC/AC converter;
The power supply device according to claim 2 or 3. the smoothing circuit includes a capacitor;
The power supply device according to any one of claims 2 to 4. a battery;
a DC/AC converter that converts a DC voltage supplied from the battery into an AC voltage;
a voltage generation circuit connected to an output terminal of the DC/AC converter and configured to convert an AC voltage into a DC voltage to generate a DC voltage;
a feedback circuit that feeds back the output of the voltage generation circuit to the battery;
a diode provided between the battery and the voltage generation circuit for preventing current from flowing from the battery to the voltage generation circuit;
has
The voltage generation circuit is
a first rectifying element having an anode connected only to one of a pair of output terminals of the DC/AC converter;
a second rectifying element having a cathode connected to the anode of the first rectifying element;
a transformer having a primary winding connected between the cathode of the first rectifying element and the anode of the second rectifying element;
a smoothing circuit connected to the secondary winding of the transformer;
A power supply having a a first rectifying element having an anode connected only to one of a pair of output terminals of the DC/AC converter;
a second rectifying element having a cathode connected to the anode of the first rectifying element;
a transformer having a primary winding connected between the cathode of the first rectifying element and the anode of the second rectifying element;
a smoothing circuit connected to the secondary winding of the transformer;
A voltage generation circuit having

Images