JP2018026917A - Power supply controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply controller capable of reducing switching noise in performing control of sequentially shunting/opening respective solar cell arrays depending on variations in bus voltage to be supplied to a load.SOLUTION: Each of power supply control circuits 11, 12, ..., 1n provided correspondingly to solar cell arrays 21, 22, ..., 2n, respectively, to control power supply to a load 30 is made to have a circuit configuration in which a second capacitor bank C2 for absorbing switching noise and a third resistor R3 for suppressing resonance at the time of switching operation are connected in series at a section between a negative electrode side terminal of a first switch element TR1 connected between a positive electrode side power output line SAP HOT and negative electrode side power output line SAP RTN and a downstream side terminal of a first current backflow prevention element D1 connected on the positive electrode side power output line SAP HOT, the section being quite close to a noise generation source at the time of switching operation of the first switch element TR1 or a second switch element TR2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply control device, for example, a power supply for use in an artificial satellite and operating as a device for supplying output power of one or a plurality of solar cell arrays to a load and stably controlling a bus voltage. The present invention relates to a control device.

  In an artificial satellite or the like, a power supply control device is usually used to supply bus power as a direct current stabilized voltage (bus voltage) such as 28V, 50V, and 100V.

  One of the power control systems for artificial satellites is a DET (Direct Energy Transfer) system in which a power output terminal is directly connected to a load via a power supply line without any control element interposed. In the DET system, when sunlight is radiated to the solar cell array of the artificial satellite (during sunshine), the electric power generated by one or a plurality of solar cell arrays is directly supplied to the load via a current backflow prevention element as supply power. By transmitting and adjusting the surplus power by short-circuiting (shunting) a specific solar cell array output, the DC bus voltage (28V, 50V, 100V, etc.) is controlled to be in a stable state. is there.

Such a DET method is roughly divided into two types of shunt control methods, an analog shunt method and a digital shunt method, for a method of short-circuiting (shunting) output power. The power control device adopting the digital shunt method as the DET method can efficiently supply the power generated by the solar cell array to the load, although the circuit is easy compared to other power control devices. Because it has the advantage that it can be used, it has been adopted by various test satellites around the world, including engineering test satellites (ETS series: Engineering Test Satellite Series).

  In the power supply control device adopting such a digital shunt DET method, the total value of electric power or current generated from one or a plurality of solar cell arrays by a switching operation for shunting or opening the output of each solar cell array Controls the bus voltage. Then, each solar cell array is shunted or opened in order (sequentially) according to the bus voltage variation, so that each solar cell array is shunted or opened corresponding to the bus voltage variation width allowed in advance. An operating area is allocated. Due to the switching operation of this shunt or open operation and the negative feedback oscillation control (commonly referred to as bang-bang control) that consists of a capacitor bank provided to smooth the bus voltage, the bus voltage changes to the specified level. A mechanism for stabilizing within the range of the width is employed (see, for example, Non-Patent Document 1, Patent Document 1, Patent Document 2, and Patent Document 3).

  In such a power supply control device, the number of constituent stages of the solar cell array and the current value per one stage of the array are determined according to the required generated power. The number of stages of the solar cell array is normally composed of several to several tens of stages, and the shunt or open operation area for each solar cell array is within the range of the bus voltage fluctuation range allowed in advance. Divided according to the number of components. That is, the voltage fluctuation width allowed between the number of constituent stages is determined approximately by the bus voltage fluctuation width / the number of constituent stages.

  In recent years, there is a tendency to narrow the bus voltage fluctuation range as much as possible to 1 V to within 3 V due to the performance improvement request of the power supply control device, and at the same time, the increase in the number of stages constituting the solar cell array due to the power increase request, There is a tendency that the current value per array stage increases and the bus voltage rises (28V → 50V → 100V). Due to these effects, the voltage fluctuation range allowed between the array stages constituting the solar cell array becomes very narrow, while the switching noise tends to increase due to an increase in current and voltage accompanying an increase in power.

JP 2011-87379 A JP 2009-118699 A JP 2009-206176 A

S. Kuwajima, et al. "Digital sequential shunt regulator for solar power conditioning of engineering test satellite (ETS-V)," Power Electronics Specialists Conference 1988 (PESC'88), IEEE, April 1988.

  As described above, in recent power supply control devices, in order to meet the demand for improving the bus voltage stability, the bus voltage fluctuation range tends to be as narrow as possible to keep it within 1V to 3V. Therefore, the number of stages constituting the solar cell array tends to increase, the current value per stage of the array increases, and the bus voltage increases (28 V → 50 V → 100 V). From these effects, the voltage fluctuation range allowed between the array stages in the solar cell array becomes very narrow, while the switching noise tends to increase due to the increase in current and voltage accompanying the increase in power. .

  In the conventional technology, the switching noise that increases with the increase in current and voltage deviates from the voltage fluctuation range allowed between the array stages in the solar cell array, and the demand and power to make the bus voltage fluctuation range as narrow as possible. It was difficult to balance the demand for increase. Specifically, although it is preferable to perform the shunt or release operation sequentially one step at a time, each power control circuit corresponding to each of the plurality of solar cell arrays performs the shunt or release operation simultaneously or simultaneously. As a result, the conventional technology has a drawback that the bus voltage deviates from the allowable fluctuation range and the bus voltage control system becomes unstable, and the problem to be solved that deviates from the allowable voltage fluctuation range. It was.

  In order to solve such problems, the following three solutions are conceivable. The first method is to slow down the response of the negative feedback oscillation control system so that the control system does not respond to switching noise. The second is a method of expanding the allowable fluctuation range of the bus voltage. The third is a method for reducing switching noise.

  The method of delaying the response of the first control system often delays the response to normal bus voltage fluctuations other than switching noise, and has a drawback that the control characteristics deteriorate. The method of expanding the allowable fluctuation range of the second bus voltage is inconsistent with the request for improving the bus voltage stability of the power supply control device (request for reducing the fluctuation range of the bus voltage as much as possible). Therefore, it is considered that the third method of reducing switching noise is the optimal solution.

  In order to reduce switching noise, the following four solutions can be considered. The first is a method of reducing power, such as reducing the current value per stage of the array or lowering the bus voltage. The second method is to increase the capacitor bank capacity. The third method is to moderate the rise and fall of the voltage and current waveform pulses in switching. The fourth method is to add a noise removal circuit in the immediate vicinity of the noise source.

  The method of reducing power, such as reducing the current value per stage of the first array or lowering the bus voltage, is inconsistent with the power increase request for the power supply control device, and is difficult to adopt. The second method of increasing the capacitor bank capacity is generally because the capacitor bank is located at a distance from the switching noise generation source, so even if the capacitor bank capacity is increased, the effect of reducing the switching noise can be achieved. In many cases, the capacitor bank capacity needs to be considerably increased in order to obtain the effect, which hinders the reduction in size and weight of the power supply control device. There are various ways to implement the method of gradual rise and fall of voltage and current waveform pulses in the third switching, but there are also disadvantages such as circuit complexity and increased heat generation. It is often difficult to realize a method that avoids the disadvantages with an actual circuit. Therefore, it is considered most desirable to add a switching noise elimination circuit immediately adjacent to the fourth noise generation source.

(Object of the present invention)
The present invention has been made in order to solve such a problem, and is a control for shunting or opening each solar cell array or each solar cell simulator as a power source in order (sequentially) in accordance with a change in bus voltage. It is an object of the present invention to provide a power supply control device that can reduce switching noise by adding a circuit for removing switching noise in the immediate vicinity of the noise generation source.

  In addition, it can be realized with a compact, lightweight, simple circuit configuration, and there are few disadvantages such as increased heat generation, and there is a demand for improved bus voltage stability (a demand to make the bus voltage fluctuation range as narrow as possible). It is another object of the present invention to provide a power supply control device that can simultaneously realize the demand for power increase.

  In order to solve the above-described problems, the power supply control device according to the present invention mainly adopts the following characteristic configuration.

(1) A power supply control device according to the present invention includes:
Corresponding to each of the solar cell array or solar cell arrays, the power control circuit for controlling power supply to the load is connected to the positive power output line and the negative power output line of each solar cell array, Connected to each other at the output ends of the positive power output line and the negative power output line of the power supply control circuit, and connected to the load as a positive bus voltage line and a negative bus voltage line, and the positive side A power supply control device in which a first capacitor bank for smoothing a bus voltage supplied to the load is connected between a bus voltage line and the negative bus voltage line,
Each of the power supply control circuits
A first switch element connected between the positive power output line and the negative power output line;
A first current backflow prevention element connected on the positive side power output line, and
For switching noise reduction between the downstream terminal of the first current backflow prevention element and the negative terminal of the first switch element, which are closest to the noise generation source during the switching operation of the first switch element. A second capacitor bank connected as
A result of monitoring the bus voltage, which is a potential difference between both ends of the first capacitor bank connected between the positive bus voltage line and the negative bus voltage line, and the power supply control circuit are allocated in advance. The first switch element is shunted or opened according to a result of comparison with the first reference voltage.

(2) A power supply control device according to the present invention includes:
Corresponding to each of one or a plurality of solar cell arrays or solar cell simulation devices, supply power to the load to each of the solar cell arrays or the positive power output line and the negative power output line of each solar cell simulation device. Each of the power supply control circuits to be controlled is connected and connected to each other at the output terminals of the positive power output line and the negative power output line of each power control circuit, and the positive bus voltage line and the negative bus voltage line And a power supply control device in which a first capacitor bank is connected between the positive bus voltage line and the negative bus voltage line for smoothing the bus voltage supplied to the load. Because
A battery for supplying power for operating each of the power supply control circuits, the positive terminal of the battery is connected to the positive power output line via a positive battery voltage line, and the negative terminal of the battery is a negative terminal Connected to the negative power output line through the battery voltage line
Each of the power supply control circuits
Connecting a first switch element and a first resistor connected in series between the positive power output line and the negative power output line;
A first current backflow prevention element and a second resistor are connected in series to the positive power output line,
Connecting a discharge circuit for discharging the power stored in the battery between the downstream side of the second resistor on the positive power output line and the positive battery voltage line;
A second switch element and a second current backflow connected in series between the upstream side of the first current backflow prevention element on the positive side bus voltage line and a connection point between the discharge circuit and the battery. Connect the prevention element,
An input terminal of a differential amplifier that amplifies a differential voltage between the positive-side bus voltage line and the negative-side bus voltage line at a predetermined amplification factor, the positive-side bus voltage line and the negative-side bus voltage line Connect between and
Connecting the output terminal of the differential amplifier and the input terminals of the first comparator and the second comparator;
An output terminal of the first comparator is connected to a control terminal of a first driver that drives the first switch element, and an output terminal of the second comparator is connected to a second driver element that drives the second switch element. Connected to the control end of the two drivers,
A downstream terminal of the first current backflow prevention element that is in the immediate vicinity of a noise generation source during a switching operation of the first switch element or the second switch element, and a terminal to which the first driver is connected The second capacitor bank connected in series and the third resistor are connected between the remaining terminals of the first switch element except the low-potential side terminal,
In the first comparator, a result obtained by comparing the output voltage from the differential amplifier with a first reference voltage assigned in advance to the power supply control circuit is input to the first driver as a first control amount. Thereby controlling the switching operation of shunting or opening the first switch element,
And,
In the second comparator, a result obtained by comparing the output voltage from the differential amplifier with a second reference voltage allocated in advance to the power control circuit is input to the second driver as a second control amount. Thus, the switching operation of short-circuiting or opening the second switch element is controlled.

  According to the power supply control device of the present invention, the following effects can be obtained.

  As a first effect, in the power supply control device that controls the output power of the solar cell or solar cell simulation device used as the power generation source, the noise generation source during the switching operation of the first switch element or the second switch element The most recent downstream terminal of the first current backflow prevention element connected on the positive power output line and the negative electrode of the first switch element connected between the positive power output line and the negative power output line Since the second capacitor bank is connected between the side terminal (low potential side terminal) for switching noise reduction, the switching noise reduction must be achieved with a small, lightweight and simple circuit configuration. Can do.

  As a second effect, in the power supply control device that controls the output power of the solar cell or solar cell simulation device used as the power generation source, there are few disadvantages such as an increase in the amount of heat generation, and switching noise reduction can be realized. .

It is a circuit diagram which shows an example of the circuit structure of the power supply control apparatus which concerns on this invention. It is a characteristic view which shows an example of the voltage waveform image in the power supply control apparatus shown in FIG.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a power supply control device according to the invention will be described with reference to the accompanying drawings. In addition, it is needless to say that the drawing reference numerals attached to the following drawings are added for convenience to each element as an example for facilitating understanding, and are not intended to limit the present invention to the illustrated embodiment. Yes.

(Features of the present invention)
Prior to the description of the embodiments of the present invention, an outline of the features of the present invention will be described first. The present invention
Installed on each power output line for supplying the power of the power generation source using one or a plurality of solar cell arrays or solar cell simulators to the load, shunted or opened, A power supply control device that suppresses an increase in the bus voltage due to surplus power on a bus voltage line that is connected to each other on the downstream side and outputs to the load as a bus voltage,
After the power output from the power generation source is smoothed by the capacitor bank through a current backflow prevention element connected in series to the positive power output line, the downstream positive bus voltage line and the negative bus voltage line Supply to the load via
When power is supplied to the load, due to a rapid change in bus voltage caused by shunting or opening operation of a switch element connected between the positive power output line and the negative power output line from the power generation source. The switching noise generated is connected via a resistor between the downstream terminal of the current backflow prevention element that is in the immediate vicinity of the switching noise generation source and the negative terminal (low potential side terminal) of the switch element. The main feature is to suppress the resonance that occurs during the switching operation while reducing it by using the capacitor.

More specifically, the present invention is characterized by adopting the following circuit configuration. That is,
Corresponding to each of one or a plurality of solar cell arrays or solar cell simulation devices, supply power to the load to each of the solar cell arrays or the positive power output line and the negative power output line of each solar cell simulation device. Each of the power supply control circuits to be controlled is connected and connected to each other at the output terminals of the positive power output line and the negative power output line of each power control circuit, and the positive bus voltage line and the negative bus voltage line And a power supply control device in which a first capacitor bank is connected between the positive bus voltage line and the negative bus voltage line for smoothing the bus voltage supplied to the load. Because
For each of the power supply control circuits, a negative terminal of a battery that supplies power for operation via a positive battery voltage line is connected to the negative power output line via a negative battery voltage line,
Each of the power supply control circuits
Connecting a first switch element and a first resistor connected in series between the positive power output line and the negative power output line;
A first current backflow prevention element and a second resistor are connected in series to the positive power output line,
Connecting a discharge circuit for discharging the power stored in the battery between the downstream side of the second resistor on the positive power output line and the positive battery voltage line;
A second switch element and a second current backflow connected in series between the upstream side of the first current backflow prevention element on the positive side bus voltage line and a connection point between the discharge circuit and the battery. Connect the prevention element,
An input terminal of a differential amplifier that amplifies a differential voltage between the positive-side bus voltage line and the negative-side bus voltage line at a predetermined amplification factor, the positive-side bus voltage line and the negative-side bus voltage line Connect between and
Connecting the output terminal of the differential amplifier and the input terminals of the first comparator and the second comparator;
An output terminal of the first comparator is connected to a control terminal of a first driver that drives the first switch element, and an output terminal of the second comparator is connected to a second driver element that drives the second switch element. Connected to the control end of the two drivers,
A downstream terminal of the first current backflow prevention element that is in the immediate vicinity of a noise generation source during a switching operation of the first switch element or the second switch element, and a terminal to which the first driver is connected The second capacitor bank connected in series and the third resistor are connected between the remaining terminals of the first switch element except the low-potential side terminal,
In the first comparator, a result obtained by comparing the output voltage from the differential amplifier with a first reference voltage assigned in advance to the power supply control circuit is input to the first driver as a first control amount. Thereby controlling the switching operation of shunting or opening the first switch element,
And,
In the second comparator, a result obtained by comparing the output voltage from the differential amplifier with a second reference voltage allocated in advance to the power control circuit is input to the second driver as a second control amount. Thus, the main feature is that the switching operation of whether the second switch element is short-circuited or opened is controlled.

  Thus, the downstream terminal of the first current backflow prevention element that is in the immediate vicinity of the switching noise generation source during the switching operation of the first switch element or the second switch element, and the first switch Of the three terminals of the element, the second capacitor bank and the low-potential side terminal of the remaining two terminals excluding the terminal (gate) to which the first driver is connected, that is, the negative terminal, By adopting a circuit configuration in which a third resistor is connected in series, the second capacitor bank absorbs switching noise of the first switch element or the second switch element, and the second capacitor bank 3 is switched by the first capacitor bank, the second capacitor bank, and the inductance component included in the wiring. It is possible to damp the resonance which occurs during operation, the fluctuation of the bus voltage caused by the switching operation can be suppressed within the allowable voltage range.

(Embodiment)
Next, an embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a circuit diagram showing an example of a circuit configuration of a power supply control device according to the present invention, and shows a configuration example of a power supply control device provided with a switching noise reduction mechanism. FIG. 2 is a characteristic diagram illustrating an example of a voltage waveform image in the power supply control device illustrated in FIG. 1, and illustrates an example of the effect of the power supply control device in FIG. 1 provided with the switching noise reduction mechanism.

(Configuration example of embodiment)
With reference to FIG. 1, the structure of the power supply control apparatus of this Embodiment is demonstrated in detail first.

  The power generation source is composed of one or a plurality of solar cell arrays 21, 22,..., 2n having an n-stage (n: natural number) configuration. Each of the solar cell arrays 21, 22,..., 2n is a power generator configured by connecting a plurality of single solar cells in series and parallel. It is assumed that the load power required by the load 30 is smaller than the total generated power of the solar cell arrays 21, 22,.

  The n-stage power supply control circuits 11, 12,... are connected to the positive power output line SAP HOT and the negative power output line SAP RTN of the n-stage solar cell arrays 21, 22,. Each of 1n is connected. The n-stage power control circuits 11, 12,..., 1 n form the power control apparatus 10. Each of the n-stage power control circuits 11, 12,..., 1n operates by supplying power from the bus voltage line. In addition, the positive power output line SAP HOT and the negative power output line SAP RTN of each of the n-stage power supply control circuits 11, 12,..., 1n are connected to each other at their output terminals, and the positive bus voltage The line BUS HOT and the negative bus voltage line BUS RTN are connected to each other, and the positive bus voltage line BUS HOT and the negative bus voltage line BUS RTN are connected to the load 30.

  A first capacitor bank C1 for smoothing the bus voltage is connected between the positive bus voltage line BUS HOT and the negative bus voltage line BUS RTN on the upstream side of the load 30. The first capacitor bank C1 is a capacitive power storage element. The battery 40 supplies power to the bus voltage line when the load power required by the load 30 becomes larger than the total generated power of the solar cell arrays 21, 22,..., 2n, that is, the total output power. The negative battery voltage line BAT RTN is connected to the negative bus voltage line BUS RTN. The positive battery voltage line BAT HOT is connected to a connection point between one end of the discharge circuit 41 and the second current backflow prevention element D2, as will be described later. The battery 40 is a power storage device configured by connecting a plurality of single storage batteries in series and parallel.

  Since each of the n-stage power control circuits 11, 12,..., 1n has the same circuit configuration, in the following, focusing on the first-stage power control circuit 11, the internal circuit configuration will be described in detail. explain.

  Between the positive power output line SAP HOT and the negative power output line SAP RTN of the solar cell array 21, a first switch element TR1 and a first resistor R1 connected in series are connected. Further, on the positive power output line SAP HOT, a first current backflow prevention element D1 is connected upstream and a second resistor R2 is connected in series downstream. The downstream side of the second resistor R2 is connected to the output terminal of the power supply control circuit 11, and then connected to the other power supply control circuits 12,..., 1n, via the positive bus voltage line BUS HOT. And connected to the load 30. The negative power output line SAP RTN is also connected to the output terminal of the power supply control circuit 11, and then connected to the other power supply control circuits 12,..., 1n and connected to the load via the negative bus voltage line BUS RTN. 30.

  A discharge circuit 41 for discharging the electric power stored in the battery 40 is connected between the downstream side of the second resistor R2 of the positive power output line SAP HOT and the positive battery voltage line BAT HOT. The Further, a series connection is made between the upstream side of the first current backflow prevention element D1 on the positive power output line SAP HOT and the positive battery voltage line BAT HOT to which the negative terminal of the discharge circuit 41 is connected. The second switch element TR2 and the second current backflow prevention element D2 are connected.

  Further, in order to control the fluctuation of the bus voltage supplied to the load 30 within a predetermined allowable voltage fluctuation range, a voltage (potential difference) between the positive bus voltage line BUS HOT and the negative bus voltage line BUS RTN is determined. ) Is connected to the positive bus voltage line BUS HOT and the negative bus voltage line BUS RTN. A differential voltage between the positive bus voltage line BUS HOT and the negative bus voltage line BUS RTN is a bus voltage. The differential amplifier 51 is a circuit that amplifies the bus voltage with a predetermined amplification factor and outputs the result as a result of monitoring the bus voltage.

  The output terminal of the differential amplifier 51 is connected to the input terminals of two comparators (comparators), a first comparator 61 and a second comparator 71. The output terminal of the first comparator 61 is connected to the control terminal of the first driver 81 that drives the first switch element TR1. The output terminal of the second comparator 71 is connected to the control terminal of the second driver 91 that drives the second switch element TR2. The first comparator 61 compares the differential voltage after being amplified by the differential amplifier 51, that is, the result of monitoring the bus voltage, with the first reference voltage assigned in advance for each power supply control circuit. The comparison result is output to the first driver 81 as a first control amount. The second comparator 71 compares the result of monitoring the differential voltage, that is, the bus voltage after being amplified by the differential amplifier 51, with a second reference voltage assigned in advance for each power supply control circuit. In this circuit, the comparison result is output to the second driver 91 as a second control amount.

  The output terminal of the first driver 81 is connected to the control terminal of the first switch element TR1, and the first switch element is used as the first control amount according to the comparison result output from the first comparator 61. A drive signal for turning on or off TR1 is transmitted to first switch element TR1. The first switch element TR1 performs a switching operation of shunting or opening the input / output terminal according to the drive signal transmitted from the first driver 81. That is, this drive signal is a control signal for selecting whether to shunt or open the first switch element TR1.

  Similarly, the output terminal of the second driver 91 is connected to the control terminal of the second switch element TR2, and the second control amount is set as the second control amount according to the comparison result output from the second comparator 71. A drive signal for turning on or off the switch element TR2 is transmitted to the second switch element TR2. The second switch element TR2 performs a switching operation for closing (short-circuiting) or opening the input / output terminal in accordance with the drive signal transmitted from the second driver 91. That is, this drive signal is a control signal for selecting whether to close (short-circuit) or open the second switch element TR2.

  Further, as a circuit for reducing switching noise (a switching noise reducing mechanism which is one of the features of the present invention), it is in the immediate vicinity of the noise generation source during the switching operation of the first switch element TR1 or the second switch element TR2. Among the three terminals of the first current backflow prevention element D1 and the first switch element TR1, the low potential side terminal of the input / output terminal other than the control terminal to which the first driver 81 is connected That is, the second capacitor bank C2 for absorbing and reducing the switching noise and the third resistor R3 for damping the resonance level between the negative terminal of the first switch element TR1. Connected in series. The second capacitor bank C2 is a capacitive power storage element. In FIG. 1, the third resistor R3 is connected in series with the positive electrode side and the second capacitor bank C2 is connected with the negative electrode side. However, the connection order may be reversed.

Specific circuit elements and examples of numerical values of main components of the power supply control device shown in FIG. 1 will be described below for reference. However, it goes without saying that the power supply control device according to the present invention is not limited to such a case.
(1) First capacitor bank C1: 4900 μF (capacitor)
(2) Second capacitor bank C2: 5 μF (capacitor)
(3) 1st resistance R1: 1 mΩ, 2nd resistance R2: 1 mΩ, 3rd R3: 1Ω
(4) First and second switch elements TR1, TR2: MOS type field effect transistors (MOSFETs: Metal-Oxide-Semiconductor Field Effect Transistors)
(5) First and second current backflow prevention elements D1, D2: diodes

(Description of operation of embodiment)
Next, an example of the operation of the power supply control device shown in FIG. 1 will be described in detail with reference to an example of a voltage waveform image shown in FIG. 2 is a characteristic diagram showing an example of a voltage waveform image in the power supply control device shown in FIG. 1 as described above, but at the time of shunt (short circuit) operation or open operation of the first switch element TR1. Alternatively, switching noise generated immediately after the closing (short-circuiting) operation or the opening operation of the second switch element TR2 is shown. That is, the voltage waveform image showing the voltage (potential difference) between the positive bus voltage line BUS HOT and the negative bus voltage line BUS RTN, that is, the voltage change occurring in the bus voltage, in other words, the first capacitor bank C1. The voltage waveform image which shows the mode of the voltage change which arises in the voltage (potential difference) of both ends is represented typically. In FIG. 2, only the AC component is shown except for the DC component of the bus voltage.

  Here, FIG. 2A shows a voltage waveform image of the bus voltage in the conventional power supply control device that does not include the switching noise reduction mechanism shown in FIG. 1 for reference. FIG. 2B shows a second power source control device of FIG. 1 having a switching noise reduction mechanism that does not include the third resistor R3 of the damping resistor that reduces the resonance level, and absorbs the switching noise. The voltage waveform image of the bus voltage when only the capacitor bank C2 is provided is shown. FIG. 2C shows the voltage of the bus voltage when the circuit configuration is the same as that of the power supply control device of FIG. 1, that is, when not only the second capacitor bank C2 but also the third resistor R3 is provided. A waveform image is shown.

  As shown in FIG. 1, the output power of the solar cell array 21 is output to the power supply control circuit 11 via the positive power output line SAP HOT and the negative power output line SAP RTN. In the power supply control circuit 11, a first current backflow prevention element D1 and a second resistor R2 are connected in series to the positive power output line SAP HOT. Output terminals on the positive electrode side and the negative electrode side in the power supply control circuit 11 are connected to the first capacitor bank C1. The output of the power supply control circuit 11 is smoothed by the first capacitor bank C1, and then supplied to the load 30 via the positive bus voltage line BUS HOT and the negative bus voltage line BUS RTN.

  The output power of the solar cell array 21 is obtained from the bus voltage (positive bus voltage line BUS HOT and negative bus voltage line supplied to the load 30 by shunting or opening the first switch element TR1 of the power supply control circuit 11. (Potential difference from BUS RTN) is controlled to be within a predetermined allowable voltage range. Details of the control operation will be described below.

  In FIG. 1, when the output power of the solar cell array 21 is supplied to the load 30, the load power required by the load 30 is smaller than the generated power of the solar cell arrays 21, 22,. Since the power generated by the solar cell array 21 cannot be consumed on the load 30 side, the potential difference between the positive bus voltage line BUS HOT and the negative bus voltage line BUS RTN, that is, the bus voltage rises. The rise of the bus voltage is constantly monitored by the differential amplifier 51 in the power supply control circuit 11. The differential amplifier 51 attenuates, amplifies, or voltage offsets the bus voltage as necessary, and then uses the first comparator 61 and the second comparator 71 as differential voltages appropriately amplified with a predetermined amplification factor. To supply.

(First operation example)
Next, as a first operation example, an operation in the case where the state of charge of the battery 40 is satisfied and the battery 40 need not be charged will be described.

  The differential voltage input to the first comparator 61 is compared with a first reference voltage allocated in advance for each power supply control circuit, and when the voltage is higher than the first reference voltage. The output terminal of the first comparator 61 changes to either High or Low that can shunt the first switch element TR1, and the changed information is a control signal for driver control (described above). First control amount) is input to the first driver 81. The first driver 81 shunts (short-circuits) the first switch element TR1 by applying a drive signal corresponding to the changed information to the control end of the first switch element TR1.

  When the first switch element TR1 is shunted (short circuit), the positive power output line SAP HOT and the negative power output line SAP RTN are short-circuited via the first resistor R1, and as a result, the sun The output power of the battery array 21 is not supplied to the load 30. That is, while the first switch element TR1 is shunted (short-circuited), the electric power from the electric charge accumulated in the first capacitor bank C1 is supplied to the load 30, so the positive-side bus voltage line BUS The potential difference between HOT and the negative side bus voltage line BUS RTN, that is, the bus voltage falls.

  The decrease in the bus voltage is constantly monitored by the differential amplifier 51 in the power supply control circuit 11, and the first comparator 61 and the differential voltage amplified by the differential amplifier 51 (result of monitoring the bus voltage) Input to the second comparator 71.

  As described above, the differential voltage input to the first comparator 61 is compared with the first reference voltage allocated in advance for each power supply control circuit, and a low voltage equal to or lower than the first reference voltage. When the output voltage of the first comparator 61 has decreased, the output terminal of the first comparator 61 changes to either Low or High that can open the first switch element TR1, and the changed information is used for driver control. The control signal (the first control amount described above) is input to the first driver 81. The first driver 81 releases the shunt state of the first switch element TR1 by applying a drive signal corresponding to the changed information to the control end of the first switch element TR1, and changes to the open state. Let

  When the first switch element TR1 is opened, the positive power output line SAP HOT and the negative power output line SAP RTN are released from the short-circuit state via the first resistor R1, As a result, the output power of the solar cell array 21 is again supplied to the load 30. That is, when the first switch element TR1 is changed to the opened state, the operation of supplying the electric power from the electric charge accumulated in the first capacitor bank C1 to the load 30 is stopped, and the solar cell array 21 to the load 30 is stopped. The power supply is started again. Here, as described above, since the load power required by the load 30 is smaller than the generated power of the solar cell arrays 21, 22,..., 2n, the solar cell arrays 21, 22,. Since the generated power cannot be consumed by the load 30, the potential difference between the positive bus voltage line BUS HOT and the negative bus voltage line BUS RTN, that is, the bus voltage starts to rise again.

  As described above, the switching operation based on the bang-bang control of repeatedly shunting (short-circuiting) or opening the first switch element TR1 is performed using the differential amplifier 51, the first comparator 61, and the first switch element TR1. However, by the switching operation, the bus voltage repeatedly rises and falls within an allowable fluctuation range that is within a predetermined voltage range, and the bus voltage can be stably controlled. .

  In the first operation example described above, when the first switch element TR1 performs a shunt or open switching operation, switching noise is generated on the positive bus voltage line BUS HOT.

  That is, when the first switch element TR1 transitions from the open state to the shunt (short circuit) state, the voltage of the positive power output line SAP HOT rapidly decreases, and the first current backflow prevention element D1 flows back. Current (that is, recovery current) is instantaneously generated. As in the case of the power supply control circuit according to the prior art, no switching noise reduction mechanism is provided, and a series connection is provided between the downstream terminal of the first current backflow prevention element D1 and the negative terminal of the first switch element TR1. When the connected second capacitor bank C2 and the third resistor R3 are not connected, the potential of the first capacitor bank C1 suddenly increases due to the recovery current that flows back through the first current backflow prevention element D1. As shown in FIG. 2A, switching noise is generated on the positive bus voltage line BUS HOT.

  As described above, when the voltage fluctuation range allowed between the stages of the number of constituent stages is very narrow due to the recent demand for improving the performance of the power supply control device, the voltage drop of the first capacitor bank C1 is drastically reduced. Due to the switching noise that accompanies this, normal voltage control cannot be performed. As a result, although it is supposed to be an operation of shunting or opening the first switch element TR1 step by step one by one, each of the plurality of solar cell arrays 21, 22,. Each of the corresponding power control circuits 11, 12,..., 1n performs an operation of shunting or releasing simultaneously or simultaneously. For this reason, the bus voltage deviates from the allowable fluctuation range, and as a result, there arises a problem that the control system of the bus voltage becomes an unstable operation and a problem of deviating from the allowable voltage fluctuation range.

  However, as shown in FIG. 1 as an embodiment of the present invention, the power supply control circuit 11 in the present embodiment has a first switching element TR1 or a second switching element TR2 as a switching noise reduction mechanism. A second capacitor bank C2 connected in series between the downstream terminal of the first current backflow prevention element D1 and the negative terminal of the first switch element TR1 that are closest to the noise generation source during the switching operation; A third resistor R3 is connected. Therefore, when the first switch element TR1 is shunted (short-circuited), the recovery current that flows back to the first current backflow prevention element D1 based on the power stored in the second capacitor bank C2 is changed to the third current The power of C2 supplied through the resistor R3 and discharged as the recovery current can be gradually supplied to C2 from the first capacitor bank C1 over time.

  As a result, as shown in FIG. 2C, the switching noise generated at both ends of the first capacitor bank C1 can be reduced, in other words, the positive bus voltage line BUS HOT and the negative bus voltage line BUS. The potential difference from the RTN, that is, the switching noise superimposed on the bus voltage can be reduced, and further, resonance can be suppressed, and the bus voltage can be stably controlled within the allowable fluctuation range. Become.

  In the case of a conventional power supply control device in which the second capacitor bank C2 and the third resistor R3 are not connected when the first switch element TR1 transitions from the shunt (short circuit) state to the open state, When the voltage of the positive power output line SAP HOT suddenly rises and the potential of the first capacitor bank C1 suddenly rises, the first switch element TR1 transitions to the shunt (short circuit) state; Similarly, as shown in FIG. 2A, switching noise occurs on the positive bus voltage line BUS HOT. As a result, there arises a problem that the bus voltage deviates from the allowable fluctuation range, the bus voltage control system becomes unstable, and the allowable voltage fluctuation width deviates.

  On the other hand, in the power supply control circuit 11 in the present embodiment shown in FIG. 1, as a switching noise reduction mechanism, the downstream terminal of the first current backflow prevention element D1 and the negative terminal of the first switch element TR1. Are connected to the second capacitor bank C2 and the third resistor R3 connected in series. Therefore, even immediately after opening the first switch element TR1, as in the case of shunting (short circuit) of the first switch element TR1, as shown in FIG. 2C, the first capacitor bank C1 Switching noise generated at both ends of the circuit can be reduced, resonance can be suppressed, and the bus voltage can be stably controlled within the allowable variation range.

  As a switching noise reduction mechanism, not the second capacitor bank C2 and the third resistor R3, but the third resistor R3 which is a resonance damping (braking) resistor is not provided, and only the second capacitor bank C2 is provided. When the first switch element TR1 performs a shunt (short circuit) / open switching operation as shown in FIG. 2B, the first capacitor bank C1 and the second capacitor are provided. Resonance occurs between the bank C2 and the inductance component included in the wiring. As a result, the bus voltage varies greatly, and in some cases, the bus voltage may deviate from the allowable variation range. Therefore, if the third resistor R3 is used as a resonance damping (braking) resistor and connected in series with the second capacitor bank C2, the resonance level due to the above factors can be damped (braking), It becomes possible to suppress the fluctuation of the bus voltage.

(Second operation example)
Next, as a second operation example, an operation when the charging state of the battery 40 is insufficient and the battery 40 needs to be charged will be described.

  The differential voltage input to the second comparator 71 is compared with a second reference voltage allocated in advance for each power supply control circuit, and when the voltage is higher than the second reference voltage. The output terminal of the second comparator 71 changes to either High or Low, which can close (short-circuit) the second switch element TR2, and the changed information is a drive signal for driving the driver (described above). The second control amount) is input to the second driver 91. The second driver 91 closes (short-circuits) the second switch element TR2 by applying a drive signal corresponding to the changed information to the control terminal of the second switch element TR2.

  When the second switch element TR2 is closed (short circuit), the positive power output line SAP HOT and the positive battery voltage line BAT HOT are short-circuited via the second current backflow prevention element D2, As a result, the battery 40 is charged by the output power of the solar cell array 21. On the other hand, the output power of the solar cell array 21 is not supplied to the load 30 while the second switch element TR2 is closed (short-circuited). Therefore, since the electric power from the electric charge accumulated in the first capacitor bank C1 is supplied to the load 30, the potential difference between the positive bus voltage line BUS HOT and the negative bus voltage line BUS RTN, that is, the bus The voltage drops.

  The decrease of the bus voltage is constantly monitored by the differential amplifier 51 in the power supply control circuit 11 and is input to the first comparator 61 and the second comparator 71 as an appropriately amplified differential voltage.

  As described above, the differential voltage input to the second comparator 71 is compared with the second reference voltage allocated in advance for each power supply control circuit, and a low voltage equal to or lower than the second reference voltage. When the output voltage of the second comparator 71 decreases, the output terminal of the second comparator 71 changes to either Low or High that can open the second switch element TR2, and the changed information is used for driver driving. As a drive signal (the above-mentioned second control amount) is input to the second driver 91. The second driver 91 releases the closed (short-circuited) state of the second switch element TR2 by applying a drive signal corresponding to the changed information to the control end of the second switch element TR2. Change to open state.

  When the second switch element TR2 is opened, the state where the positive power output line SAP HOT and the positive battery voltage line BAT HOT are short-circuited via the second current backflow prevention element D2 is released and opened. As a result, the output power of the solar cell array 21 is again supplied to the load 30. That is, when the second switch element TR2 is changed to an open state, the operation of supplying power from the electric charge stored in the first capacitor bank C1 to the load 30 is stopped, and the solar cell array 21 to the load 30 is stopped. The power supply is started again. Here, as initially assumed, when the load power required by the load 30 is smaller than the generated power of the solar cell arrays 21, 22,..., 2n, the generated power of the solar cell arrays 21, 22,. Since the load 30 cannot be consumed, the potential difference between the positive bus voltage line BUS HOT and the negative bus voltage line BUS RTN, that is, the bus voltage starts to rise again.

  As described above, the switching operation based on the bang-bang control in which the second switch element TR2 is repeatedly shunted (short-circuited) or opened using the differential amplifier 51, the second comparator 71, and the second switch element TR2. However, by the switching operation, the bus voltage repeatedly rises and falls within an allowable fluctuation range that is within a predetermined voltage range, and the bus voltage can be stably controlled. .

  Even in the second operation example as described above, when the second switch element TR2 performs a switching operation of closing (short-circuiting) or opening, switching noise is generated on the positive bus voltage line BUS HOT. .

  That is, when the second switch element TR2 transitions from the open state to the closed (short-circuited) state, the voltage of the positive power output line SAP HOT drops rapidly, and the first current backflow prevention element D1 is A reverse current (that is, a recovery current) is instantaneously generated. As in the case of the power supply control circuit according to the prior art, the switching noise reduction mechanism is not provided, and between the downstream terminal of the first current backflow prevention element D1 and the negative terminal of the first switch element TR1, When the second capacitor bank C2 connected in series and the third resistor R3 are not connected, the potential of the first capacitor bank C1 is caused by the recovery current that flows back through the first current backflow prevention element D1. Along with the rapid decrease, switching noise occurs on the positive bus voltage line BUS HOT as shown in FIG.

  As described above, because of the recent demand for improving the performance of the power supply control device and the like, the voltage fluctuation range allowed between the stages of the number of constituent stages is very narrow, and thus the sudden voltage drop of the first capacitor bank C1. Due to the switching noise that accompanies this, normal voltage control cannot be performed. As a result, the operation should be normally closed (short-circuited) or opened one by one in sequence, but corresponds to each of the plurality of solar cell arrays 21, 22,..., 2n. Each of the power control circuits 11, 12,..., 1n performs an operation of closing (short-circuiting) or opening the second switch element TR2 simultaneously or simultaneously. For this reason, the bus voltage deviates from the allowable fluctuation range, and as a result, there arises a problem that the control system of the bus voltage becomes an unstable operation and a problem of deviating from the allowable voltage fluctuation range.

  However, as shown in FIG. 1 as an embodiment of the present invention, the power supply control circuit 11 in the present embodiment has a first switching element TR1 or a second switching element TR2 as a switching noise reduction mechanism. A second capacitor bank C2 connected in series between the downstream terminal of the first current backflow prevention element D1 and the negative terminal of the first switch element TR1 that are closest to the noise generation source during the switching operation; A third resistor R3 is connected. Therefore, when the second switch element TR2 is closed (short-circuited), a recovery current that flows back to the first current backflow prevention element D1 is generated based on the power stored in the second capacitor bank C2. The power of C2 supplied through the resistor R3 and discharged as the recovery current can be gradually supplied to C2 from the first capacitor bank C1 over time.

  As a result, as shown in FIG. 2C, the switching noise generated at both ends of the first capacitor bank C1 can be reduced, in other words, the positive bus voltage line BUS HOT and the negative bus voltage line BUS. The potential difference from the RTN, that is, the switching noise superimposed on the bus voltage can be reduced, and further, resonance can be suppressed, and the bus voltage can be stably controlled within the allowable fluctuation range. Become.

  In the case of the conventional power supply control device in which the second capacitor bank C2 and the third resistor R3 are not connected when the second switch element TR2 transitions from the closed (short circuit) state to the open state. As the voltage of the positive power output line SAP HOT suddenly rises and the potential of the first capacitor bank C1 suddenly rises, the second switch element TR2 transitions to the closed (short circuit) state. As in the case, as shown in FIG. 2A, switching noise is generated on the positive bus voltage line BUS HOT. As a result, there arises a problem that the bus voltage deviates from the allowable fluctuation range, the bus voltage control system becomes unstable, and the allowable voltage fluctuation width deviates.

  On the other hand, in the power supply control circuit 11 in the present embodiment shown in FIG. 1, as a switching noise reduction mechanism, the downstream terminal of the first current backflow prevention element D1 and the negative terminal of the first switch element TR1. Are connected to the second capacitor bank C2 and the third resistor R3 connected in series. Accordingly, even immediately after the second switch element TR2 is opened, as in the case of closing (short circuit) of the second switch element TR2, as shown in FIG. Switching noise generated at both ends of C1 can be reduced, resonance can be suppressed, and the bus voltage can be stably controlled within the allowable variation range.

  The switching noise reduction mechanism does not include both the second capacitor bank C2 and the third resistor R3, but does not include the third resistor R3 that is a resonance damping (braking) resistor, and the second capacitor bank C2 2B, as shown in FIG. 2B, when the second switch element TR2 performs the switching operation of closing (short circuit) / opening, the first capacitor bank C1 and the second capacitor element C2 Resonance occurs between the capacitor bank C2 and the inductance component included in the wiring. As a result, the bus voltage varies greatly, and in some cases, the bus voltage may deviate from the allowable variation range. Therefore, if the third resistor R3 is used as a resonance damping (braking) resistor and is connected in series with the second capacitor bank C2, the resonance level due to the factor can be damped (braking), and the bus It becomes possible to suppress the fluctuation of the voltage.

(Another embodiment according to the present invention)
The solar cell arrays 21, 22,..., 2n shown in FIG. 1 are examples of power sources that generate power, and are replaced with other power sources having similar functions, for example, solar cell simulation devices that simulate solar cells. May be. In the embodiment shown in FIG. 1, the solar cell arrays 21, 22,..., 2 n and the power supply control device 10 are assumed to be mounted on an artificial satellite, but are installed on the ground or the like. Needless to say, it may be done.

  Further, in the power supply control device 10 shown in FIG. 1, the first and second current backflow prevention elements D1, D2 prevent the backflow of current to the solar cell arrays 21, 22,. Although a diode is used as an example, it may be replaced with another current backflow prevention element having a similar function.

  In the power supply control device 10 shown in FIG. 1, MOS field effect transistors (MOSFETs) are used as an example of the first and second switch elements TR1 and TR2, but other switch elements are used. Also good.

  In the power supply control device 10 shown in FIG. 1, capacitors are used as an example of the first and second capacitor banks C1 and C2, but other capacitive power storage elements may be used.

  Further, in the power supply control device 10 shown in FIG. 1, as a connection relationship between the third resistor R3 and the second capacitor bank C2, the third resistor R3 is connected to the positive electrode side, that is, the high potential side, and the second capacitor Although the bank C2 is arranged and connected on the negative electrode side, that is, on the low potential side, the third resistor R3 may be connected on the low potential side and the second capacitor bank C2 may be connected on the high potential side. .

  Further, in the power supply control device 10 shown in FIG. 1, the first and second resistors R1 and R2 are connected, but the first and second resistors R1 and R2 are current detection resistors. When the current detection is unnecessary or when the current is detected by another method, the first and second resistors R1 and R2 are unnecessary.

  Further, in the power supply control device 10 shown in FIG. 1, an example is shown in which the power supply control circuit 11 to the power supply control circuit 1n are each provided with one differential amplifier 51. Alternatively, only one power supply control circuit 11 to power supply control circuit 1n may be provided in common, or a plurality (for example, three) may be provided in common to all power supply control circuits 11 to 1n. ) Differential amplifier 51 as a majority redundant configuration (for example, two-thirds redundant configuration).

  In the power supply control device 10 shown in FIG. 1, instead of the second comparator 71, the second driver 91, the second switch element TR2, and the second current backflow prevention element D2, a battery charge controller ( A battery charge control device, a battery charge / discharge controller, or a battery charge / discharge control device may also be installed).

  In the power supply control device 10 shown in FIG. 1, the second comparator 71, the second driver 91, the second switch element TR2, the second current backflow prevention element D2, and the discharge circuit 41 are eliminated, and the positive side The battery voltage line BAT HOT and the positive bus voltage line BUS HOT may be connected.

(Explanation of effect of embodiment)
As described in detail above, the following effects can be achieved in the embodiment according to the present invention.

  The first effect is that the power supply control device 10 that controls the output power of a solar cell or a solar cell simulation device used as a power generation source has a small, light, and simple circuit configuration and realizes switching noise reduction. Can do.

  The second effect is that, in the power supply control device 10 that controls the output power of the solar cell or solar cell simulation device used as the power generation source, there are few demerits such as an increase in the amount of heat generation, and switching noise reduction can be realized. it can.

  The present invention can be used not only on artificial satellites but also on the ground, for example, it can be applied to solar cells mounted on buildings, solar cells mounted on vehicle bodies, etc. For example, the power generated in the solar cell or the solar cell simulation device can be effectively used for the device that supplies the load as a DC-stabilized voltage by switching and performing negative feedback control.

  The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such embodiments are merely examples of the present invention and do not limit the present invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention.

10 power control devices 11, 12,..., 1n power control circuits 21, 22,..., 2n solar cell array 30 load 41 discharge circuit 51 differential amplifier 61 first comparator 71 second comparator 81 first driver 91 first driver 91 No. 2 driver BAT HOT Positive battery voltage line BAT RTN Negative battery voltage line BUS HOT Positive bus voltage line BUS RTN Negative bus voltage line C1 First capacitor bank C2 Second capacitor bank D1 First current backflow prevention Element D2 Second current backflow prevention element R1 First resistor R2 Second resistor R3 Third resistor SAP HOT Positive power output line SAP RTN Negative power output line TR1 First switch element TR2 Second switch element

Claims (10)

Corresponding to each of the solar cell array or solar cell arrays, the power control circuit for controlling power supply to the load is connected to the positive power output line and the negative power output line of each solar cell array, Connected to each other at the output ends of the positive power output line and the negative power output line of the power supply control circuit, and connected to the load as a positive bus voltage line and a negative bus voltage line, and the positive side A power supply control device in which a first capacitor bank for smoothing a bus voltage supplied to the load is connected between a bus voltage line and the negative bus voltage line,
Each of the power supply control circuits
A first switch element connected between the positive power output line and the negative power output line;
A first current backflow prevention element connected on the positive side power output line, and
For switching noise reduction between the downstream terminal of the first current backflow prevention element and the negative terminal of the first switch element, which are closest to the noise generation source during the switching operation of the first switch element. A second capacitor bank connected as
A result of monitoring the bus voltage, which is a potential difference between both ends of the first capacitor bank connected between the positive bus voltage line and the negative bus voltage line, and the power supply control circuit are allocated in advance. A power supply control device, wherein the first switch element is shunted or opened according to a comparison result with a first reference voltage. Each of the power supply control circuits
2. The device according to claim 1, further comprising a resistor connected in series to a terminal on a positive electrode side or a negative electrode side of the second capacitor bank for resonance damping during a switching operation of the first switch element. The power supply control device described in 1. A battery for supplying power for operation of each of the power control circuits;
The positive terminal of the battery is connected to the positive power output line via a positive battery voltage line,
The negative terminal of the battery is connected to the negative power output line via a negative battery voltage line,
Each of the power control circuits includes a second switch element and a second current backflow connected in series between the positive power output line and the positive battery voltage line on the battery side in order to charge the battery. A prevention element,
A result of monitoring the bus voltage, which is a potential difference between both ends of the first capacitor bank connected between the positive bus voltage line and the negative bus voltage line, and the power supply control circuit are allocated in advance. The power supply control device according to claim 1, wherein the second switch element is short-circuited or opened according to a comparison result with a second reference voltage. Each of the power supply control circuits further comprises a differential amplifier connected between the positive bus voltage line and the negative bus voltage line in order to obtain a result of monitoring the bus voltage,
The bus voltage is amplified by the differential amplifier at a predetermined amplification factor, and the bus voltage is output as a result of monitoring and compared with the first reference voltage or the second reference voltage. The power supply control device according to claim 2 or 3.   5. The differential amplifier according to claim 4, wherein instead of providing each differential power supply circuit for each of the power supply control circuits, only one common power supply control circuit is provided, or a plurality of differential amplifiers are provided in a majority redundant configuration. The power supply control device described. A second resistor is connected in series with the first current backflow prevention element on the positive power output line and on the downstream side of the first current backflow prevention element,
A discharge circuit is connected between the downstream side of the second resistor on the positive power output line and the positive battery voltage line in order to discharge the power stored in the battery to the positive power output line. The power supply control device according to claim 1, wherein the power supply control device is a power supply control device.   The first switch element and the second switch element are configured using MOS field effect transistors, and the first current backflow prevention element and the second current backflow prevention element are configured using a diode, 7. The power supply control device according to claim 1, wherein the first capacitor bank and the second capacitor bank are configured using capacitors.   The power supply control device according to any one of claims 1 to 7, wherein a solar cell simulation device that simulates a solar cell is used instead of the solar cell array that serves as a power source. Corresponding to each of one or a plurality of solar cell arrays or solar cell simulation devices, supply power to the load to each of the solar cell arrays or the positive power output line and the negative power output line of each solar cell simulation device. Each of the power supply control circuits to be controlled is connected and connected to each other at the output terminals of the positive power output line and the negative power output line of each power control circuit, and the positive bus voltage line and the negative bus voltage line And a power supply control device in which a first capacitor bank is connected between the positive bus voltage line and the negative bus voltage line for smoothing the bus voltage supplied to the load. Because
A battery for supplying power for operating each of the power supply control circuits, the positive terminal of the battery is connected to the positive power output line via a positive battery voltage line, and the negative terminal of the battery is a negative terminal Connected to the negative power output line through the battery voltage line
Each of the power supply control circuits
Connecting a first switch element and a first resistor connected in series between the positive power output line and the negative power output line;
A first current backflow prevention element and a second resistor are connected in series to the positive power output line,
Connecting a discharge circuit for discharging the power stored in the battery between the downstream side of the second resistor on the positive power output line and the positive battery voltage line;
A second switch element and a second current backflow connected in series between the upstream side of the first current backflow prevention element on the positive side bus voltage line and a connection point between the discharge circuit and the battery. Connect the prevention element,
An input terminal of a differential amplifier that amplifies a differential voltage between the positive-side bus voltage line and the negative-side bus voltage line at a predetermined amplification factor, the positive-side bus voltage line and the negative-side bus voltage line Connect between and
Connecting the output terminal of the differential amplifier and the input terminals of the first comparator and the second comparator;
An output terminal of the first comparator is connected to a control terminal of a first driver that drives the first switch element, and an output terminal of the second comparator is connected to a second driver element that drives the second switch element. Connected to the control end of the two drivers,
A downstream terminal of the first current backflow prevention element that is in the immediate vicinity of a noise generation source during a switching operation of the first switch element or the second switch element, and a terminal to which the first driver is connected A second capacitor bank and a third resistor connected in series between the remaining terminals of the first switching element except the low potential side terminal;
In the first comparator, a result obtained by comparing the output voltage from the differential amplifier with a first reference voltage assigned in advance to the power supply control circuit is input to the first driver as a first control amount. Thereby controlling the switching operation of shunting or opening the first switch element,
And,
In the second comparator, a result obtained by comparing the output voltage from the differential amplifier with a second reference voltage allocated in advance to the power control circuit is input to the second driver as a second control amount. Thus, the switching operation of whether the second switch element is short-circuited or opened is controlled. Instead of the second comparator, the second driver, the second switch element and the second current backflow prevention element, a configuration using a battery charge controller,
Alternatively, the positive battery voltage line and the positive bus voltage line are connected without using the second comparator, the second driver, the second switch element, the second current backflow prevention element, and the discharge circuit. The power supply control device according to claim 9, wherein the power supply control device is any one of the configurations to be configured.

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