JP3482980B2 - Power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize the accumulated energy of an electric double layer capacitor effectively, and besides, to charge the electric double layer capacitor by a secondary battery, in a power unit which utilizes the electric double layer capacitor and the secondary battery as a power supply. SOLUTION: Power is supplied from an electric double layer capacitor 2 to load L via a DC-DC converter 9 controlled so that the output voltage may be constant. A circuit which charges the electric double layer capacitor 2 by the secondary battery 1 includes a switching element 10 for charge control. A charge current is let flow to the electric double layer capacitor 2 during ON period by turning on or turning off the switching element 10, according to the control signal from the control circuit 8a. The control circuit 8a outputs a control signal to charge the electric double layer capacitor 2 by turning on or turning off the switching element 10 for charge control without hindering the electric double layer capacitor from supplying power to load L.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device that uses an electric double layer capacitor as a storage element, and more particularly to a technique for enhancing the effect of using the electric double layer capacitor.

[0002]

2. Description of the Related Art Conventionally, a secondary battery has been used for various purposes, but the secondary battery generally has an energy density (Wh / k).
g) is high, but the power density in charging and discharging (maximum output per unit weight: W / kg) is low compared to other energy sources. This is because the secondary battery operates by converting electrical energy into chemical energy and storing it during charging, and reversely converting it during discharging. That is, although the power density of the secondary battery is determined by the speed of the electrochemical reaction, increasing the speed of the electrochemical reaction is limited, so that the power density cannot be increased.

The low power density of the secondary battery does not pose a problem when using small electric equipment, but in the case of using electric energy as power, which is represented by an electric vehicle, that is, in power applications. It becomes a problem.
For example, in an electric vehicle, when quick acceleration is required for safety and smooth traffic, a secondary battery having a low power density may not provide the required acceleration.

Electric double-layer capacitors have been attracting attention as another chargeable / dischargeable power source for such secondary batteries. This is to store electric charge as an electrostatic charge in the electric double layer formed at the interface when the electron conductive substance is brought into contact with the electrolytic solution, which is much higher than that of a capacitor using a dielectric such as ceramic. Large capacity can be obtained. The electric double layer capacitors recently announced by various companies are several hundred F
There are a few thousand to hundreds of degrees. These have a low internal resistance, can discharge a large current in a short time, and have a power density of
The maximum is several thousand W / kg, which is far superior to the secondary battery in this respect. In addition, since the charge / discharge does not involve a chemical reaction, the life performance during charge / discharge cycles is excellent, and the performance hardly deteriorates under normal use conditions. Although the electric double layer capacitor has many advantages over the secondary battery as described above, it has a large capacity but still has a lower energy density than the secondary battery, and therefore has a small capacity for power applications. The drawbacks remain.

As described above, a secondary battery having a high energy density but a low power density, and an electric double layer capacitor having a completely opposite characteristic thereof are combined to obtain new characteristics as a hybrid power source. Attempts have already been made. For example, as described in Japanese Patent Laid-Open No. 4-340328, by connecting both a secondary battery and an electric double layer capacitor in parallel to a load, rapid charging,
There is one that enables high power discharge. Further, as disclosed in JP-A-4-112163, there is one in which a secondary battery and an electric double layer capacitor using an organic solution electrolyte are connected in parallel.

[0006]

Although the terminal voltage of the secondary battery during discharging is substantially constant, the terminal voltage of the electric double layer capacitor drops due to discharging. In the above-mentioned two prior applications, the secondary battery and the electric double layer capacitor are simply connected in parallel to the load, and the terminal voltage of the electric double layer capacitor is always equal to the terminal voltage of the secondary battery. Therefore, the electric double layer capacitor can discharge the electric double layer capacitor only by the amount of decrease in discharge overvoltage of the secondary battery, and there is a drawback that the intended effect is not sufficiently obtained.

Therefore, the applicant, according to Japanese Patent Application No. 7-252269 filed on September 29, 1995, arranges a DC-DC converter between the electric double layer capacitor and the load and applies it to the load. By holding the voltage at a constant value for a certain period of time, it becomes possible to supply a current of a predetermined value from the electric double layer capacitor to the load for a certain period of time.
It was proposed to utilize the stored electric energy of the electric double layer capacitor as much as possible. When the previously proposed power supply device is used in a device that does not have a dedicated power source for charging the electric double layer capacitor, there is a problem that it is difficult to recharge the electric double layer capacitor.

An object of the present invention is a power supply device that uses an electric double layer capacitor and a secondary battery as a power source, which can effectively use the stored electric energy of the electric double layer capacitor and can appropriately supply a load to the load by the secondary battery. And to provide a power supply device capable of charging an electric double layer capacitor.

Another object of the present invention is to provide a power supply device capable of charging an electric double layer capacitor with a secondary battery without affecting the power supply from the secondary battery to a load and the discharge from the electric double layer capacitor. That is.

[0010]

In order to solve the above problems, the present invention is directed to a power supply device including an electric double layer capacitor and a secondary battery as a power source, the electric double layer capacitor being charged by the secondary battery. As, the electric power is supplied to the load from the electric double layer capacitor via the DC-DC converter controlled so that the output voltage becomes constant.

When the DC-DC converter is in operation, the voltage applied to the load is held at a constant value for a certain period of time, and the electric double layer capacitor supplies current to the load. As a result, the operating voltage range of the electric double layer capacitor can be increased, and the electric energy stored in the electric double layer capacitor can be effectively used. After finishing the discharge from the electric double layer capacitor, DC-D
The C converter goes into a non-operating state to supply current from the secondary battery to the load, and the secondary battery charges the electric double layer capacitor. As a result, the electric double layer capacitor is recharged and can be used again.

The present invention also provides a DC-DC converter including an electric double layer capacitor and a secondary battery as a power source, the electric double layer capacitor being charged by the secondary battery and controlled so that the output voltage becomes constant. A power supply device that supplies electric power from an electric double layer capacitor to a load through the power supply device. Then, the charging circuit that charges the electric double layer capacitor using the secondary battery as a power source turns on the switching element for charging control according to the control signal output from the charging control means.
The charging current is made to flow from the secondary battery to the electric double layer capacitor during the OFF period and the ON period.

The charging control means turns on / off the switching element for charging control without disturbing the supply of electric power from the electric double layer capacitor to the load through the DC-DC converter, and the electric double layer capacitor from the secondary battery. A control signal is output so that the charging current can be supplied to.

When the secondary battery and the electric double layer capacitor are connected in parallel, the voltage of the electric double layer capacitor does not drop below the voltage of the secondary battery, and the accumulated charge of the electric double layer capacitor is sufficient. Cannot discharge. When the charging control switching element is provided in the charging circuit, the electric double layer capacitor can be discharged without being affected by the secondary battery while the switching element is in the OFF state. And D
When the voltage adjustment switching element of the C-DC converter is in the off state, the discharge from the electric double layer capacitor is stopped. At this time, therefore, the charging control switching element is turned on and the secondary battery is used to generate electric power. If the multi-layer capacitor is charged, the electric double-layer capacitor can be charged without affecting the discharge from the electric double-layer capacitor. While the DC-DC converter is in the non-operating state and the power is being supplied from the secondary battery to the load, the charging control switching element is turned on in consideration of the power supply status from the secondary battery to the load. Since the electric double layer capacitor can be turned off and recharged, the electric double layer capacitor can be recharged without affecting the supply of power from the secondary battery to the load.

Further, in the present invention, the DC-DC converter includes a voltage adjusting switching element that is on / off controlled to keep the output voltage constant, and uses a secondary battery as a power source to charge the electric double layer capacitor. Includes a charge control switching element that is turned on / off in accordance with a control signal output from the charge control means and causes a charge current to flow from the secondary battery to the electric double layer capacitor during the on period. Then, the charge control means turns off the charge control switching element when the voltage adjustment switching element of the DC-DC converter is in the on state, and switches the charge control switching element when the voltage adjustment switching element is in the off state. A control signal may be output so that the element is turned on.

With this configuration, when the switching element for adjusting the voltage of the DC-DC converter is in the off state and the discharge from the electric double layer capacitor is stopped, the switching element for the charge control is in the on state. Since the electric double layer capacitor is charged by the secondary battery, the electric double layer capacitor can be charged without affecting discharge from the electric double layer capacitor. Also, while the DC-DC converter is in the non-operating state and the power is being supplied from the secondary battery to the load, the charging control switching element is in the ON state, and the electric double layer capacitor is reactivated by the secondary battery. To charge.

From the charging control means to the charging control switch
As the control signal output to the switching element, it is preferable to use a control signal whose phase is inverted from that of the control signal for controlling the voltage adjustment switching element. By doing so, the charging control means can be configured by utilizing a part of the control circuit of the DC-DC converter. Further, it is possible to reliably prevent the voltage adjustment switching element and the charge control switching element of the DC-DC converter from being turned on at the same time.

When the DC-DC converter is in a non-operating state, the charge control means shortens the ON state of the charge control switching element and reduces the discharge current when the discharge current flowing from the secondary battery to the load is large. At times, it is preferable to output a control signal that prolongs the ON state of the charging control switching element. In this way, the electric double layer capacitor can be recharged without affecting the supply of electric power from the secondary battery to the load.

The present invention further includes a first DC-DC which includes an electric double layer capacitor and a secondary battery as a power source, and the electric double layer capacitor is charged by the secondary battery and controlled so that the output voltage becomes constant. Electric power is supplied from the electric double layer capacitor to the load via the converter, and electric power is supplied from the secondary battery to the load via the second DC-DC converter controlled so that the output voltage becomes constant. DC-
A power supply device for selectively operating the DC converter and the second DC-DC converter is intended. The first and second DC-DC converters each include a voltage adjustment switching element that is on / off controlled to keep the output voltage constant, and charge the electric double layer capacitor using the secondary battery as a power source. The circuit includes a charge control switching element that is turned on / off in accordance with a control signal output from the charge control means and flows a charge current from the secondary battery to the electric double layer capacitor during the on period.

Then, the charge control means is the first DC-D.
When the C converter is in operation, the first DC-
Control so that the charging control switching element is turned off when the voltage adjustment switching element of the DC converter is on, and the charging control switching element is turned on when the voltage adjustment switching element is off. When the second DC-DC converter outputs a signal and the second DC-DC converter is in the operating state, the voltage control switching element of the second DC-DC converter is in the ON state, and the charging control switching element is in the OFF state. A control signal is output so that the charging control switching element is turned on when the adjustment switching element is off.

In this way, the first and second DC-
The voltage adjustment switching element and the charge control switching element of the DC converter do not turn on at the same time, and the charging operation of the electric double layer capacitor by the secondary battery does not affect the power supply to the load.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a secondary battery and 2 is an electric double layer capacitor, both of which are connected in parallel via a switch 3 and also to a load L in parallel.
9 is a DC- which receives the voltage of the electric double layer capacitor 2 as an input
This is a DC converter, and this converter is a voltage adjusting switching element 4, a diode 5, a smoothing capacitor 6, a transformer 7, a FET, a bipolar transistor, etc.
And a pulse width control system in which the control circuit 8 and the like are interconnected as shown in the drawing.

The operation of the power supply device shown in FIG. 1 will be described. The secondary battery 1 is preliminarily charged by a power supply separately from the circuit. When the switch 3 is turned on, the secondary battery 1
Current flows from the electric double layer capacitor 2 to the capacitor 2 and the capacitor 2 is charged. The electric double layer capacitor 2 has an order of magnitude larger capacity than an electrolytic capacitor using a dielectric and has an internal resistance that cannot be ignored. Therefore, charging takes several seconds to several minutes. At the time of discharging, the output of the electric double layer capacitor 2 becomes a pulse current by turning on / off the voltage adjustment switching element 4 formed of an FET, and this pulse current is stepped up or stepped down by the transformer 7. Then, the output of the transformer 7 is rectified by the rectifying and smoothing action of the diode 5 and the smoothing capacitor 6, and becomes a DC output that is stepped up or stepped down to a constant voltage required for the load. The control circuit 8 detects this DC output voltage, changes the duty ratio of the output pulse of the switching element 4, and outputs a control signal for controlling the DC output voltage so as to keep it constant. Thereby, the operating voltage width of the electric double layer capacitor 2 can be increased, and the electric energy stored in the capacitor 2 can be effectively used.

However, there is a limit to the constant voltage control of the DC output voltage, and when the accumulated charge of the electric double layer capacitor 2 decreases to a certain level or less, the output voltage gradually decreases from a constant value. Along with this, the output current also decreases. When the control circuit 8 detects that the output voltage has started to decrease from a constant value, the control circuit 8 stops the output of the control signal to the switching element 4 in order to make the DC-DC converter 9 inoperative. DC-DC converter 9
When the discharge from the electric double layer capacitor 2 is completed by making the non-operating state, current is supplied from the secondary battery 1 to the load L in earnest. Even when the DC-DC converter 9 is in the operating state, the capacitor 2 is charged by the secondary battery 1 when the switching element 4 is in the off state. The electric double layer capacitor 2 is charged by the secondary battery 1 while the DC-DC converter 9 is in the non-operating state. As a result, the electric double layer capacitor 2 is recharged and can be used again.

The power supply device as shown in FIG. 1 first requires an electric double layer capacitor 2 having a high power density when a large amount of power is required in a short time such as when starting a motor of an electric vehicle. Is used effectively when sufficient starting power is supplied to the motor via the DC-DC converter 9 and required driving power is supplied mainly from the secondary battery 1 after starting. By appropriately selecting the characteristics of the DC-DC converter 9, the interphase function of the power supply from the electric double layer capacitor 2 and the secondary battery 1 to the load L can be set to a desired level to some extent. This allows
The power supply device has both the features of the secondary battery 1 having excellent energy density and the features of the electric double layer capacitor 2 having excellent power density.

In the power supply device of FIG. 1, since the secondary battery 1 and the electric double layer capacitor 2 are connected in parallel, the capacitor 2 is always rechargeable from the secondary battery 1.
In this embodiment, since the charging current of the capacitor 2 is not particularly controlled, even when the total load is large to some extent when the discharging of the capacitor 2 is started and the discharging of the secondary battery 1 is started, It is possible that a part of the discharge current will be used to charge the capacitor 2. Therefore,
The effect of the hybrid power source may not be fully exhibited.

FIG. 2 shows an embodiment in which this drawback is eliminated.
This is one in which a charging control switching element 10 such as an FET or a bipolar transistor is added to a charging circuit in order to control the charging current. In this embodiment, a part of the control circuit 8a constitutes a charge control means for controlling the charging of the capacitor 2 by the chopper using the switching element 10 composed of FET. That is, the charging current is controlled by turning the switching element 10 of the charging circuit on and off at a high speed and changing the ratio of the on time to the off time. When the ratio of the on-time is large, the charging load on the secondary battery 1 is large. Switching element 10
When is off, the electric double layer capacitor 2 is not charged from the secondary battery 1.

Therefore, when the switching element 4 is in the off state, the discharge from the capacitor 2 is stopped, so if the switching element 10 is turned on at this time and the secondary battery 1 charges the capacitor 2, Two
The capacitor 2 can be charged without affecting the discharge from. The control circuit 8a in the figure includes a charge control means for controlling ON / OFF of the switching element 10. This charge control means increases the charging of the capacitor 2 and discharges the capacitor 2 when the load of discharge is small. When the load is large, the switching element 10 is controlled so that the capacitor 2 is less charged.

There are several possible methods for realizing this, but a simple and effective control method will be described below. As shown in FIG. 6, in the DC-DC converter 9, the ratio of the on-time to the off-time of the DC-DC converter 9 changes depending on the magnitude of the discharge load L. That is, when the load L is large (high load), the proportion of the ON time of the switching element 4 is large, and when the load L is small (low load), the proportion of the ON time of the switching element 4 is small. Utilizing this, when the DC-DC converter 9 is in the operating state, the charging control switching element 10 is turned off when the voltage adjustment switching element 4 of the DC-DC converter 9 is on, and the voltage adjustment is performed. The charging control means included in the control circuit 8a outputs a control signal so that the charging control switching element 10 is turned on when the switching element 4 is off. The charging control unit that outputs such a control signal can be configured by an inverter circuit that uses a comparator or the like. That is, the switching element 4 of the DC-DC converter
The inverter circuit is configured to invert a waveform of the control signal to be output to the switching element 10 and output the waveform as the control signal of the switching element 10. That is, the charging control switching element 10 is turned off when the voltage adjustment switching element 4 of the DC-DC converter 9 is on, and the switching element 10 is turned on when the switching element 4 is off. To control. By doing this, DC-
In the pulse control method of the DC converter 9, when the ratio of the on time is large, the ratio of the on time of the charging current is small, and when the ratio of the on time is small, the ratio of the on time of the charging current can be increased. As a result,
When the total load of discharge is large, the electric double layer capacitor 2 having excellent power density is selectively discharged, and when the total load of discharge is small, the electric double layer capacitor 2 is effectively charged from the secondary battery 1. Will be. Further, while the voltage adjustment switching element 4 of the DC-DC converter 9 is continuously turned off and the secondary battery 1 is supplying power to the load L, the switching element 10 is turned on and the capacitor 2 It is completely charged by the secondary battery 1.

In the embodiment of FIG. 3, the diode 11 is added to the charging circuit of the capacitor 2, but by doing so, the discharge current from the electric double layer capacitor 2 does not pass through the charging circuit and is DC. Since only the DC converter 9 is passed, the electric double layer capacitor 2 can be discharged to a lower voltage, and the effect of the hybrid power source can be further enhanced.

In the present invention, it has been shown in the above embodiments that a hybrid power supply device using both a secondary battery and an electric double layer capacitor is constructed. The structure for making a more excellent hybrid power supply device is as follows. Shown in. In the embodiment shown in FIG. 4, the secondary battery 1 is connected to the secondary battery 1 through the diode 12.
It is connected in parallel with the output of the DC-DC converter.
Although the secondary battery 1 has little voltage change during discharging, it is not completely absent, and the voltage gradually decreases as it discharges. When the outputs of the secondary battery 1 and the DC-DC converter 9 are simply connected in parallel, when the voltage of the secondary battery 1 becomes lower than the output of the DC-DC converter 9 during discharging, the secondary battery is switched to the secondary battery. It is conceivable that current will flow in. In addition, the starting current of the motor used as the load L is the secondary battery 1
There is also a drawback that it partially flows backwards. With the configuration shown in FIG. 4, it is possible to prevent current from flowing into the secondary battery 1.
Since a diode is incorporated inside the DC-DC converter 9, the reverse phenomenon does not occur.

Next, another embodiment of the present invention will be described in which power can be satisfactorily supplied to the loads from the secondary battery 1 and the electric double layer capacitor 2, respectively, and the electric double layer capacitor 2 can be recharged well. This will be described with reference to FIG. 4 of FIG.
′ Is a switching element for voltage adjustment, 5 ′ is a diode,
Reference numeral 7'denotes a transformer, and 8b is a control circuit having a charging control means, which are interconnected together with the smoothing capacitor 6 as shown in the drawing to form a second DC-DC converter 9 '.
Are configured. Other configurations are the same as those in FIG. That is, in the embodiment of FIG. 5, the electric power of the secondary battery 1 is controlled by the DC-DC control so that the output voltage becomes constant.
The load L is supplied via the converter 9 '. The control circuit 8b includes a DC-DC converter 9 '.
Output a control signal for controlling. As a result, the current supplied from the secondary battery 1 to the load L becomes constant as long as the load L does not change. The control circuit 8b and the control circuit 8a
Is configured such that when one is operating, the other is inactive. Therefore two DC-D
The C converter does not operate at the same time.

On the other hand, the electric power from the electric double layer capacitor 2 is also the first DC-DC converter 9 as in the above-mentioned embodiment.
Is supplied to the load L via. That is, in the embodiment of FIG. 5, the power utilization efficiency of the electric double layer capacitor 2 can be improved, and the power utilization efficiency of the secondary battery 1 can be improved. Also, the first and second DC-
By appropriately selecting the output voltage characteristics of the DC converters 9 and 9 ', the correlation of the power supply from the capacitor 2 and the secondary battery 1 to the load L can be set to a desired degree to some extent.

Further, in the embodiment of FIG. 5, similarly to the embodiment of FIG. 2, when the first DC-DC converter 9 is in the operating state and the voltage adjusting switching element 4 is in the ON state. The charge control means of the control circuit 8a outputs a control signal so that the charge control switching element 10 is turned off and the charge control switching element 10 is turned on when the voltage adjustment switching element 4 is off. Output. In addition, the second DC-DC converter 9 '
Is in an operating state, the charging control switching element 10 is turned off when the voltage adjustment switching element 4'is in an on state, and the switching element 10 is turned on when the switching element 4'is in an off state. A control signal is output from the charging control means of the control circuit 8b so that the control circuit 8b is brought into the state. As described above, the control circuit 8b is the control circuit 8
A control signal is output when a is in a non-operating state. The charge control means of the control circuit 8b outputs an inverted signal of the control signal of the switching element 4'as a control signal of the switching element 10 as in the charge control means included in the control circuit 8a described in the embodiment of FIG. . In this example, the two charging control means included in each of the control circuits 8a and 8b constitute the charging control means specified in the claims. In this way, the charging operation of the electric double layer capacitor by the secondary battery does not affect the power supply to the load.

[0036]

As described above, according to the power supply device of the present invention, the power supply device includes an electric double layer capacitor and a secondary battery as a power source, and the electric double layer capacitor is charged by the secondary battery. Since the electric double layer capacitor supplies the electric power to the load through the DC-DC converter whose voltage is controlled to be constant, the voltage applied to the load is maintained at a predetermined voltage for a certain period, It is possible to supply a predetermined value of current from the electric double layer capacitor to the load for a certain period of time. As a result, the electric charge accumulated in the electric double layer capacitor can be sufficiently discharged and used. Then, after the discharge from the electric double layer capacitor is completed, the secondary battery can appropriately supply power to the load, and the electric double layer capacitor can be reliably recharged. Therefore, according to the present invention, it is possible to appropriately use both the high energy density secondary battery and the high output density electric double layer capacitor to obtain a power supply device having excellent responsiveness to a fluctuating load. it can. Further, since the load on the secondary battery can be leveled with respect to the fluctuating load, there is an advantage that the life of the secondary battery is improved.

Further, according to the power supply device of the present invention, the electric double layer capacitor can be discharged without being affected by the secondary battery. Further, the electric double layer capacitor can be charged without affecting the discharge from the electric double layer capacitor. Further, the electric double layer capacitor can be recharged without affecting the supply of electric power from the secondary battery to the load.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an example as an example of an embodiment of a power supply device of the present invention.

FIG. 2 is a circuit diagram showing another example as an example of the embodiment of the present invention.

FIG. 3 is a circuit diagram showing another example as an example of the embodiment of the present invention.

FIG. 4 is a circuit diagram showing another example as an example of the embodiment of the present invention.

FIG. 5 is a circuit diagram showing another example as an example of the embodiment of the present invention.

6 is a diagram illustrating a case where the electric double layer capacitor in the power supply device of the embodiment of FIG.
FIG. 3 is a waveform diagram showing respective gate / source voltage waveforms of a switching element that turns on / off a current to a C converter and a switching element that turns on / off a current that charges an electric double layer capacitor from a secondary battery.

[Explanation of symbols]

1 secondary battery 2 Electric double layer capacitor 3 switches 4,4 'Switching element for voltage adjustment 5,5 ', 11,12 Diode 6 Smoothing capacitor 7,7 'transformer 8 control circuit 8a, 8b Control circuit having charge control means 9,9 'DC-DC converter 10 Switching element for charge control L load

Continuation of the front page (56) Reference JP-A-50-158013 (JP, A) JP-A-7-87687 (JP, A) JP-A-4-193033 (JP, A) JP-A-50-153228 (JP , A) JP-A-4-340328 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02J 1/00 H02J 7/00

Claims (4)

(57) [Claims] 1. An electric double layer capacitor and a secondary battery are electrically charged.
And the electric double layer capacitor is
It is charged by the pond and controlled so that the output voltage is constant.
The electric double layer converter via a DC-DC converter
A power supply device for supplying power from a capacitor to a load, wherein the DC-DC converter keeps the output voltage constant.
ON / OFF controlled voltage adjustment switching element
The electric double layer capacitor using the secondary battery as a power source.
The charging circuit for charging is controlled by the charging control means.
Turn on / off according to the signal, and the secondary battery is turned on during the on period.
Charging control to supply charging current to the electric double layer capacitor
A switching element for the DC-DC converter.
When the switching element for voltage adjustment is in the ON state
The charging control switching element is turned off, and
When the switching element for pressure adjustment is in the off state,
Before turning on the charging control switching element,
A power supply device characterized by outputting a control signal . 2. A charging control switch from the charging control means.
The control signal output to the switching element is the voltage
The phase is opposite to the control signal for controlling the adjustment switching element.
The power supply device according to claim 1, which is rotating . 3. The charging control means is the DC-DC controller.
If the inverter is inactive,
When the discharge current flowing from the
The ON state of the control switching element becomes shorter,
When the charging current is small, the charging control switching element
Outputs the control signal to prolong the ON state of the child
The power supply device according to claim 1, wherein: 4. An electric double layer capacitor and a secondary battery are electrically charged.
And the electric double layer capacitor is
It is charged by the pond and controlled so that the output voltage is constant.
The electric double via a first DC-DC converter
Power is supplied from the layer capacitor to the load, and the output voltage is constant
The second DC-DC converter controlled to become
Power is supplied to the load from the secondary battery via the first battery.
DC-DC converter and second DC-DC converter
A power supply device for selectively operating the power supply, wherein the first and second DC-DC converters are the output power supplies.
For voltage adjustment that is on / off controlled to keep the pressure constant
Each of the switching elements includes a switching element, and the electric double layer capacitor is powered by the secondary battery.
The charging circuit for charging is controlled by the charging control means.
Turn on / off according to the signal, and the secondary battery is turned on during the on period.
Charging control to supply charging current to the electric double layer capacitor
A switching element, and the charge control means includes the first DC-DC converter.
Is operating, the first DC-DC converter is
The voltage adjustment switching element of the barter is turned on.
The charging control switching element is turned off at a certain time.
The voltage adjustment switching element is in the off state.
When the charging control switching element is turned on
To output the control signal to the second DC-D
When the C converter is in operation, the second D
Switching element for voltage adjustment of C-DC converter
The switching element for charge control when the
And the switching element for voltage adjustment is turned off.
The charging control switching element when in the off state
To output the control signal so that
Characteristic power supply device.