JP6096828B2 - Power supply system - Google Patents

Description

  The present invention relates to a power supply system including a bidirectional power conversion unit that converts DC power supplied from a DC power source into AC power and outputs the power, and converts AC power supplied from the system into DC power and outputs the power. .

  The non-contact power receiving device shown in Patent Document 1 is configured to receive power in a non-contact manner, and the temperature of an electric device connected to the power receiving unit based on a parameter related to power receiving efficiency of the power receiving unit. The vehicle ECU controls the cooling fan based on a parameter related to power reception efficiency.

JP 2013-135572 A

  The conventional technique represented by Patent Document 1 is not configured to be able to suppress the consumption of power stored in a DC power supply connected to a power supply system including a bidirectional power conversion unit. There was a problem that it was not possible to meet the need to further reduce the consumption of stored power.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the electric power supply system which can suppress further the consumption of the electric power stored in DC power supply.

In order to solve the above-described problems and achieve the object, the power supply system of the present invention converts DC power supplied from a DC power source into AC power and outputs it, and converts AC power supplied from the system to DC power. A bi-directional power conversion unit that converts and outputs the power, a rectification unit that outputs DC power for a control power source using AC power output from the bi-directional power conversion unit or the system, and power output from the rectification unit A control power generation unit that generates a control power by the cooling unit that operates with power supplied from the control power generation unit and cools at least one of the bidirectional power conversion unit and the control power generation unit, both As the current detection value of the alternating current output from the bidirectional power conversion unit or the current detection value of the alternating current input to the bidirectional power conversion unit decreases, the control power supply generation unit supplies the cooling means. Comprising cooling means controller for reducing the power to be fed, and a current sensor for detecting the alternating current supplied to the home load from the bidirectional power conversion unit, the current sensor of the bidirectional power conversion unit an output stage, Ru is located between the input stage of the control power generation unit.

  According to the present invention, it is possible to further reduce the consumption of electric power stored in a DC power source.

Configuration diagram of power supply system according to Embodiment 1 The figure showing the structure of the circuit arrange | positioned in the circuit board shown in FIG. 1 in the electric power supply system which concerns on Embodiment 1. FIG. The figure for demonstrating operation | movement of the cooling fan control part in the electric power supply system which concerns on Embodiment 1. FIG. The flowchart at the time of controlling so that the rotation speed of a cooling fan falls as the electric current detection value falls in the electric power supply system which concerns on Embodiment 1. The flowchart when changing the air volume of a cooling fan in steps according to an electric current detection value in the electric power supply system which concerns on Embodiment 1. FIG. The flowchart when changing a fan drive number setting value according to an electric current detection value in the electric power supply system which concerns on Embodiment 1. FIG. The flowchart when changing the fan drive time according to the detected current value in the power supply system according to the first embodiment. Configuration diagram of power supply system according to Embodiment 3 Configuration diagram of power supply system according to Embodiment 4 The figure for demonstrating operation | movement of the electric power supply system which concerns on Embodiment 4. FIG. The flowchart when changing the output power of a bidirectional | two-way power conversion part according to a voltage detection value and changing the air volume of a cooling fan in the power supply system which concerns on Embodiment 4. FIG. Configuration diagram of power supply system according to Embodiment 5 The figure for demonstrating operation | movement of the electric power supply system which concerns on Embodiment 5. FIG. The flowchart when changing the air volume of a cooling fan according to a temperature detection value in the electric power supply system which concerns on Embodiment 5. FIG.

  Hereinafter, a power supply system according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a power supply system according to the first embodiment. A power supply system 100 shown in FIG. 1 converts DC power supplied from a battery mounted on an electric vehicle (EV) 200 that is a DC power supply into AC power, or converts AC power supplied from the system 400 into DC power. The circuit board 1 on which a circuit having a function of converting and outputting the power and generating a control power supply for the power supply system 100 is arranged, and an alternating current flowing from the circuit arranged on the circuit board 1 to the in-home load 300 Cooling driven by electric power supplied from the control power supply of the current sensor 2 that detects the current or the AC current flowing from the system 400 to the circuit arranged on the circuit board 1 and outputs the detected current detection value. A cooling fan control unit 4 that controls the fan 3 according to the detected current value output from the current sensor 2 is provided. The wind generated by the cooling fan 3 serving as a cooling means is supplied to the circuit board 1 through the air passage 3a. Home load 300 is a home appliance such as an IH cooking heater, a refrigerator, or lighting. The in-home load 300 is supplied with AC power output from a circuit arranged on the circuit board 1 or AC power output from the system 400. In the following description, a battery mounted on the EV 200 is simply referred to as an EV battery.

  2 is a diagram showing a configuration of a circuit arranged on the circuit board shown in FIG. 1 in the power supply system according to the first embodiment. The circuit board 1 converts the DC power supplied from the EV 200 into AC power and outputs it, and also has a bidirectional power conversion function that converts the AC power supplied from the system 400 into DC power and outputs it. Power converter 5, rectifier 6 that rectifies AC power output from bidirectional power converter 5 or AC power output from system 400 and outputs DC power for control power, and output from rectifier 6 The control power generation unit 7 that generates a control power from the DC power that is generated, the backup battery charging unit 8 that charges the backup battery with the DC power output from the rectification unit 6, and the cathode at the output stage of the control power generation unit 7 And a backflow prevention diode 9 having an anode connected to the output stage of the backup battery charger 8.

  The bidirectional power converter 5 has both a converter and an inverter function. For example, when supplying the electric power stored in the EV battery to the residential load 300, the converter boosts or reduces the voltage of the DC power supplied from the EV battery. The inverter outputs DC power, which is output power of the converter, to AC power of 50 Hz or 60 Hz. When the EV battery is charged with power supplied from the system 400, the inverter converts 50 Hz or 60 Hz AC power into DC power, and boosts or steps down the DC power that is output from the inverter. When the system 400 is normal, that is, when there is no power outage, power is supplied from the system 400 to the in-house load 300. At the time of power outage, the DC power supplied from the EV battery is converted into AC power by the bidirectional power conversion unit 5 and converted. The AC power thus supplied is supplied to the home load 300. For example, when the total power consumption of the residential load 300 is 1,000 W, the output voltage of the bidirectional power conversion unit 5 is AC 200 V, and therefore the alternating current output from the bidirectional power conversion unit 5 is 5 A. When the in-home load 300 is 6,000 W, the alternating current output from the bidirectional power converter 5 is 30A.

  The rectifier 6 is connected to the output stage of the bidirectional power converter 5. The control power generation unit 7 connected to the output stage of the rectification unit 6 generates a control power necessary for the operation of various devices mounted on the power supply system 100. For example, the power source for driving the cooling fan control unit 4, the power source for driving the cooling fan 3, the power source for driving the gate of the main circuit constituting the bidirectional power conversion unit 5, and the power supply system 100 can be used. This is a power supply for an operation panel (not shown).

  A backup battery 11 is connected to the output stage of the control power generator 7 and the output stage of the backup battery charger 8 via the switch 10. When the power supply system 100 is activated, the switch 10 is turned on manually or the like, whereby the power source of the backup battery 11 is supplied to the bidirectional power conversion unit 5. Next, the DC power supplied from the EV 200 is converted into AC power by the bidirectional power converter 5 and supplied to the rectifier 6, and the control power generator 7 receives the supply of DC power rectified by the rectifier 6. to start. When the control power generation unit 7 is activated, the power output from the control power generation unit 7 is supplied to the bidirectional power conversion unit 5 and the cooling fan control unit 4 instead of the backup battery 11. The cooling fan control unit 4 controls the number of revolutions of the cooling fan 3 according to the detection value detected by the current sensor 2, so that the amount of power supplied to the cooling fan 3, that is, from the control power generation unit 7 to the cooling fan 3. Adjust the amount of power supplied to 2 is cooled by wind supplied from the cooling fan 3 shown in FIG. 1 through the air passage 3a.

  Next, the operation of the power supply system 100 according to the first embodiment will be specifically described with reference to FIGS. 3 to 7.

  FIG. 3 is a diagram for explaining the operation of the cooling fan control unit in the power supply system according to the first embodiment.

  In FIG. 3A, the horizontal axis represents the detected current value detected by the current sensor 2, and the vertical axis represents the fan air volume. In the example of FIG. 3A, the cooling fan 3 is controlled so that the air volume of the cooling fan 3, that is, the rotational speed of the cooling fan 3 decreases as the current detection value detected by the current sensor 2 decreases.

  In FIG. 3B, the horizontal axis represents the detected current value detected by the current sensor 2, and the vertical axis represents the fan air volume. b is a threshold value for determining the current detection value. a1 is the air volume setting value of the cooling fan 3 when the current detection value is less than the threshold value b, and a2 is the air volume setting value of the cooling fan 3 when the current detection value is greater than or equal to the threshold value b. The air volume setting value a2 is higher than the air volume setting value a1. The threshold value b and the air volume setting values a1 and a2 may be set in advance in the cooling fan control unit 4, or may be input to the power supply system 100 from the outside. In the example of FIG. 3B, when the current detection value is equal to or greater than the threshold value b, the cooling fan 3 is controlled so that the air volume of the cooling fan 3 becomes the air volume setting value a2, and when the current detection value is less than the threshold value b. The cooling fan 3 is controlled so that the air volume of the cooling fan 3 becomes the air volume setting value a1. In other words, the air flow of the cooling fan 3 is controlled so as to decrease stepwise as the current detection value decreases.

  In FIG. 3C, the horizontal axis represents the current detection value detected by the current sensor 2, and the vertical axis represents the fan drive number setting value. On the vertical axis, the fan drive number setting value “1” when the current detection value is less than the threshold value b1, and the fan drive number setting value “2” when the current detection value is greater than or equal to the threshold value b1 and less than the threshold value b2. The fan drive number setting value “3” when the current detection value is equal to or greater than the threshold value b2 is shown. b1 and b2 are threshold values for determining the current detection value, and the threshold value b2 is higher than the threshold value b1. The threshold values b1 and b2 and the fan drive number set value may be set in the cooling fan control unit 4 in advance, or may be input to the power supply system 100 from the outside. In the example of FIG. 3C, for example, when three cooling fans 3 are used, when the detected current value is equal to or greater than the threshold value b2, the three cooling fans 3 are driven and the detected current value is the threshold value b1. When the above is less than the threshold value b2, two cooling fans 3 are driven, and when the detected current value is less than the threshold value b1, one cooling fan 3 is driven. That is, the number of fan drives is controlled to decrease stepwise as the current detection value decreases.

  In FIG. 3D, the horizontal axis represents the detected current value detected by the current sensor 2, and the vertical axis represents the fan drive time. b1 and b2 are threshold values for determining the current detection value. The threshold value b2 is higher than the threshold value b1. t1 is the fan drive time when the current detection value is less than the threshold value b1, t2 is the fan drive time when the current detection value is the threshold value b1 or more and less than the threshold value b2, and t3 is the current detection value is the threshold value b2 or more. Is the fan drive time. The fan drive time t2 is a value greater than the fan drive time t1, and the fan drive time t3 is a value greater than the fan drive time t2. For example, when the cooling fan control unit 4 performs PWM (Pulse Width Modulation) control on the electric motor built in the cooling fan 3, as shown on the upper side of FIG. 3D, each of the ON times of a plurality of switching pulses for driving the electric motor. The width is the fan drive time. In the example of FIG. 3D, the on-time of the switching pulse is controlled so that the fan drive time is t3 when the detected current value is equal to or greater than the threshold value b2. When the detected current value is not less than the threshold value b1 and less than the threshold value b2, the ON time of the switching pulse is controlled so that the fan drive time becomes t2. When the detected current value is less than the threshold value b1, the ON time of the switching pulse is controlled so that the fan driving time is t1. For example, the on-duty corresponding to the fan driving time t1 is 30%, the on-duty corresponding to the fan driving time t2 is 50%, and the on-duty corresponding to the fan driving time t3 is 100%. In this way, in the example of FIG. 3D, control is performed so that the on-duty of the switching pulse decreases as the current detection value decreases.

  FIG. 4 is a flowchart when control is performed so that the number of rotations of the cooling fan decreases as the current detection value decreases in the power supply system according to the first embodiment. When the power supply system 100 is activated, the current sensor 2 detects the output current of the bidirectional power conversion unit 5 (step S1), and the cooling fan control unit 4 detects the current sensor 2 as shown in FIG. The cooling fan 3 is controlled so that the number of rotations of the cooling fan 3 decreases as the current detection value detected in (1) decreases (step S2). With this operation, the power consumption of the cooling fan 3 is suppressed as the current detection value decreases, and the power consumption stored in the EV battery can be suppressed.

  FIG. 5 is a flowchart when the air volume of the cooling fan is changed stepwise in accordance with the detected current value in the power supply system according to the first embodiment. When the power supply system 100 is activated, the current sensor 2 detects the output current of the bidirectional power converter 5 (step S11), and the current detection value detected by the current sensor 2 is less than the threshold value b (step S12). , Yes), as shown in FIG. 3B, the cooling fan control unit 4 controls the cooling fan 3 so that the air volume of the cooling fan 3 becomes the air volume setting value a1 (step S13). When the detected current value is not less than the threshold value b (No at Step S12), the cooling fan control unit 4 controls the cooling fan 3 so that the air volume of the cooling fan 3 becomes the air volume setting value a2 (Step S14). With this operation, the power consumption of the cooling fan 3 is suppressed as the current detection value decreases, and the power consumption stored in the EV battery can be further suppressed.

  FIG. 6 is a flowchart when the fan drive number setting value is changed in accordance with the current detection value in the power supply system according to the first embodiment. When the power supply system 100 is activated, the current sensor 2 detects the output current of the bidirectional power converter 5 (step S21), and the current detection value detected by the current sensor 2 is less than the threshold value b1 (step S22). , Yes), the cooling fan control unit 4 drives one cooling fan 3 (step S23), and when the current detection value is not less than the threshold value b1 (step S22, No), the current detection value is less than the threshold value b2. Determine whether or not. When the current detection value is less than the threshold value b2 (step S24, Yes), the cooling fan control unit 4 drives the two cooling fans 3 (step S25), and when the current detection value is not less than the threshold value b2 (step S24). , No), the cooling fan control unit 4 drives the three cooling fans 3 (step S26). As a result of this operation, as the current detection value decreases, the number of cooling fans 3 driven decreases, the power consumption of the cooling fans 3 is suppressed, and the power consumption stored in the EV battery can be suppressed. The number of times of driving 3 and the driving time are reduced, and the cooling fan 3 can be used for a long time.

  FIG. 7 is a flowchart when the fan drive time is changed in accordance with the detected current value in the power supply system according to the first embodiment. When the power supply system 100 is activated, the current sensor 2 detects the output current of the bidirectional power converter 5 (step S31), and the current detection value detected by the current sensor 2 is less than the threshold value b1 (step S32). , Yes), the cooling fan control unit 4 controls the cooling fan 3 so that the fan driving time becomes t1 (step S33). When the detected current value is not less than the threshold value b1 (step S32, No), the cooling fan control unit 4 determines whether or not the detected current value is less than the threshold value b2. When the detected current value is less than the threshold value b2 (step S34, Yes), the cooling fan control unit 4 controls the cooling fan 3 so that the fan driving time becomes t2 (step S35). When the detected current value is not less than the threshold value b2 (step S34, No), the cooling fan control unit 4 controls the cooling fan 3 so that the fan driving time becomes t3 (step S36). With this operation, the power consumption of the cooling fan 3 when the cooling fan 3 is controlled by PWM control can be suppressed, and the power consumption stored in the EV battery can be suppressed.

  As described above, in the power supply system 100 of the first embodiment, the power consumption of the cooling fan 3 is suppressed by reducing the air volume of the cooling fan 3 as the current detection value decreases, and the power stored in the EV battery is reduced. Can be reduced. In addition, noise reduction can be achieved by reducing the air volume of the cooling fan 3.

Embodiment 2. FIG.
In the first embodiment, the operation example in the case where the electric power stored in the EV battery is supplied to the in-home load 300 when the system 400 is normal is described. However, when the EV battery is charged, the AC power supplied from the system 400 is The bidirectional power converter 5 converts the power into DC power, and the direct current power converted by the bidirectional power converter 5 is charged to the EV battery. For example, the amount of alternating current flowing into the bidirectional power converter 5 is different between charging at 1 kW and charging at 6 kW. Therefore, the amount of heat generated by the switching elements of the main circuit constituting the bidirectional power conversion unit 5 decreases as the amount of charge of the EV battery decreases. In the power supply system 100 according to the second embodiment, the current sensor 2 detects the amount of current flowing into the bidirectional power conversion unit 5, and the cooling fan control unit 4 decreases the current detection value detected by the current sensor 2. Control is performed so that the cooling capacity of the cooling fan 3 is lowered. The control method of the cooling fan 3 is the same as the operation example shown in FIGS.

  According to the power supply system 100 of the second embodiment, power consumption generated in the power supply system 100 is suppressed when the amount of charge to the EV battery is small, and the power consumption supplied from the system 400 is suppressed. The effect of reducing the electricity bill can be obtained. In addition, noise reduction can be achieved by reducing the air volume of the cooling fan.

Embodiment 3 FIG.
FIG. 8 is a configuration diagram of a power supply system according to the third embodiment. In the power supply system 100 </ b> A of the third embodiment, the current sensor 2 is arranged between the output stage of the bidirectional power converter 5 and the input stage of the rectifier 6. The same as the first embodiment except that the position of the current sensor 2 is changed. In FIG. 8, the circuit board 1 shown in FIG. 1 is not shown, and the backup battery charger 8, the switch 10, the backflow prevention diode 9, and the backup battery 11 shown in FIG. 2 are omitted. By arranging the current sensor 2 as shown in FIG. 8, the DC power supplied from the EV battery is converted into AC power by the bidirectional power converter 5, and the AC power converted by the bidirectional power converter 5 is In addition to being supplied to the in-home load 300, the control power generation unit 7 is supplied via the rectification unit 6. Therefore, the current sensor 2 detects the current value of the alternating current supplied to both the home load 300 and the rectifying unit 6. For example, when the power supplied to the home load 300 is 5 kW and the power supplied to the control power generation unit 7 is 200 W, the output voltage of the bidirectional power conversion unit 5 is AC 200 V. That is, it is possible to detect the sum of the currents supplied to the home load 300 and the control power generation unit 7. As a result, in addition to the same effects as those of the first embodiment, the cooling fan 3 can be controlled more accurately.

Embodiment 4 FIG.
FIG. 9 is a configuration diagram of a power supply system according to the fourth embodiment. In the power supply system 100B of the fourth embodiment, a voltage sensor 20 that detects a voltage applied from the EV battery to the bidirectional power conversion unit 5 is used instead of the current sensor 2 of the first embodiment. The cooling fan control unit 4 controls the cooling fan 3 according to the detected voltage value detected by the voltage sensor 20. 9, illustration of the circuit board 1 shown in FIG. 1 is omitted, and illustration of the backup battery charging unit 8, the switch 10, the backflow prevention diode 9, and the backup battery 11 shown in FIG. 2 is omitted. When power supply from the EV battery to the in-house load 300 is continued during a power failure, the capacity of the battery, that is, the state of charge (SOC) of the battery decreases with time, and the output voltage of the EV battery also decreases. In the fourth embodiment, the output voltage of the EV battery is monitored, the upper limit value of the output power of the bidirectional power converter 5 is changed according to the detected voltage value with respect to the threshold value b in FIG. 10, and the control of the cooling fan controller 4 is performed. As a result, the power consumption of the cooling fan 3 is reduced.

  The operation of the power supply system 100B according to the fourth embodiment will be specifically described with reference to FIGS.

  FIG. 10 is a diagram for explaining the operation of the power supply system according to the fourth embodiment. The horizontal axis represents the voltage detection value detected by the voltage sensor 20, and the vertical axis represents the fan air volume. b is a threshold value for determining the voltage detection value. a1 is the air volume setting value of the cooling fan 3 when the voltage detection value is less than the threshold value b, and a2 is the air volume setting value of the cooling fan 3 when the voltage detection value is greater than or equal to the threshold value b. The air volume setting value a2 is higher than the air volume setting value a1. The threshold value b and the air volume setting values a1 and a2 may be set in the cooling fan control unit 4 in advance, or may be input from the outside to the power supply system 100B. In the example of FIG. 10, when the voltage detection value is less than the threshold value b, the cooling fan 3 is controlled so that the air volume of the cooling fan 3 becomes the air volume setting value a1. When the detected voltage value is equal to or greater than the threshold value b, the cooling fan 3 is controlled so that the air volume of the cooling fan 3 becomes the air volume setting value a2.

  A specific example will be described below. When the output voltage of the EV battery is 400 V, which is higher than the threshold value b, the SOC can be regarded as 100%, for example. When the output voltage of the EV battery is sufficient, the capacity of the EV battery is sufficient, so the bidirectional power converter 5 supplies power to the home load 300 without setting the upper limit value of the output power. For example, when the in-home load 300 is 6,000 W, the bidirectional power conversion unit 5 can supply up to 6,000 W to the in-house load 300, but the bidirectional power conversion unit 5 has a high heat generation amount. Therefore, it is necessary to increase the air volume of the cooling fan 3. Therefore, the cooling fan control unit 4 controls the cooling fan 3 with the air volume setting value a2 so that the air volume of the cooling fan 3 is maximized when the output voltage of the EV battery is 400V higher than the threshold value b.

  When the output voltage of the EV battery is 360 V, which is lower than the threshold value b, the SOC can be regarded as 20%, for example. Since the capacity of the EV battery is small at the output voltage of the EV battery, the bidirectional power conversion unit 5 sets an upper limit value of the output power so that, for example, only up to 2,000 W can be supplied to the residential load 300. To do. By limiting the amount of output power that can be supplied to the home load 300, the amount of heat generated by the bidirectional power converter 5 is suppressed. In this case, since the amount of heat generated by the bidirectional power conversion unit 5 is low, even if the amount of cooling air for the bidirectional power conversion unit 5 is reduced, the bidirectional power conversion unit 5 is not affected by the heat generation. Moreover, since the heat generation amount of the control power generation unit 7 is also reduced by reducing the air volume of the cooling fan 3, the air volume of the cooling air to the control power generation unit 7 can also be reduced. Therefore, when the output voltage of the EV battery is 360 V, which is lower than the threshold value b, the cooling fan control unit 4 controls the cooling fan 3 with the air volume setting value a1 in order to reduce the air volume of the cooling fan 3.

  FIG. 11 is a flowchart for changing the output power of the bidirectional power conversion unit and the air flow rate of the cooling fan in accordance with the voltage detection value in the power supply system according to the fourth embodiment. When the power supply system 100B is activated, the voltage sensor 20 detects the output voltage of the bidirectional power converter 5 (step S41), and the voltage detection value detected by the voltage sensor 20 is less than the threshold value b (step S42). , Yes), the bidirectional power conversion unit 5 limits the output power (step S43), and the cooling fan control unit 4 sets the cooling fan 3 so that the air volume of the cooling fan 3 becomes the air volume setting value a1, as shown in FIG. 3 is controlled (step S44). When the detected voltage value is not less than the threshold value b (step S42, No), the bidirectional power conversion unit 5 does not limit the output power (step S45), and the cooling fan control unit 4 determines that the air volume of the cooling fan 3 is the air volume setting value. The cooling fan 3 is controlled to become a2 (step S46). The cooling fan control unit 4 of the fourth embodiment estimates the remaining amount of the EV battery based on the voltage detection value of the voltage applied from the EV battery to the bidirectional power conversion unit 5, and the estimated remaining amount decreases. You may comprise so that the electric power supplied to the cooling fan 3 may be reduced as it goes. In addition, the power supply system 100B of the fourth embodiment uses a remaining amount detection unit that detects the remaining amount of the EV battery instead of the voltage sensor 20, and the remaining amount detection value detected by the remaining amount detection unit decreases. Accordingly, the power supplied to the cooling fan 3 may be reduced.

  As described above, the power supply system 100B according to the fourth embodiment reduces the upper limit value of the output power of the bidirectional power conversion unit 5 by the bidirectional power conversion unit 5 as the SOC value of the EV battery decreases. The amount of generated heat is suppressed, and as the SOC value of the EV battery decreases, the air volume of the cooling fan 3 is reduced to reduce the power supplied from the control power generation unit 7 to the cooling fan 3 for cooling. The power consumption of the fan 3 is suppressed. With this configuration, the amount of power stored in the EV battery decreases as the capacity of the EV battery decreases and power supply becomes impossible, and the EV battery can last longer. In addition, noise reduction can be achieved by reducing the air volume of the cooling fan 3.

Embodiment 5. FIG.
FIG. 12 is a configuration diagram of a power supply system according to the fifth embodiment. In the power supply system 100C of the fifth embodiment, a temperature sensor 30 that detects heat generated in the bidirectional power converter 5 is used instead of the current sensor 2 of the first embodiment. The cooling fan control unit 4 controls the cooling fan 3 according to the temperature detection value detected by the temperature sensor 30. 12, illustration of the circuit board 1 shown in FIG. 1 is omitted, and illustration of the backup battery charger 8, the switch 10, the backflow prevention diode 9, and the backup battery 11 shown in FIG. 2 is omitted.

  The operation of the power supply system 100C according to the fifth embodiment will be specifically described with reference to FIGS.

  FIG. 13 is a diagram for explaining the operation of the power supply system according to the fifth embodiment. The horizontal axis represents the temperature detection value detected by the temperature sensor 30, and the vertical axis represents the fan air volume. d is a threshold value for determining the temperature detection value. a1 is the air volume setting value of the cooling fan 3 when the temperature detection value is less than the threshold value d, and a2 is the air volume setting value of the cooling fan 3 when the temperature detection value is the threshold value d or more. The air volume setting value a2 is higher than the air volume setting value a1. The threshold value d and the air volume setting values a1 and a2 may be set in advance in the cooling fan control unit 4, or may be input to the power supply system 100C from the outside. In the example of FIG. 13, when the temperature detection value is less than the threshold value d, the cooling fan 3 is controlled so that the air volume of the cooling fan 3 becomes the air volume setting value a1. When the detected temperature value is equal to or higher than the threshold value d, the cooling fan 3 is controlled so that the air volume of the cooling fan 3 becomes the air volume setting value a2.

  A specific example will be described below. As the power consumption of the home load 300 increases, the output current amount of the bidirectional power conversion unit 5 increases, so the amount of heat generated by the bidirectional power conversion unit 5 also increases. However, the cooling fan control unit 4 is detected by the temperature sensor 30. Until the temperature detection value exceeds the threshold value d, the cooling fan 3 is driven with the airflow setting value a1 in order to suppress the fan airflow. Thereby, the bidirectional | two-way power converter 5 and the control power generation part 7 are cooled with the wind sent from the cooling fan 3 driven by the airflow setting value a1. When the detected temperature value exceeds the threshold value d, the cooling fan control unit 4 drives the cooling fan 3 with the airflow setting value a2 in order to operate the cooling fan 3 with the maximum airflow. Thereby, the bidirectional | two-way power converter 5 and the control power generation part 7 are cooled with the wind sent from the cooling fan 3 driven with the airflow setting value a2.

  FIG. 14 is a flowchart when changing the air volume of the cooling fan in accordance with the detected temperature value in the power supply system according to the fifth embodiment. When the power supply system 100C is activated, the temperature sensor 30 detects the temperature of the bidirectional power conversion unit 5 (step S51), and the temperature detection value detected by the temperature sensor 30 is less than the threshold value d (step S52, As shown in FIG. 13, the cooling fan control unit 4 controls the cooling fan 3 so that the air volume of the cooling fan 3 becomes the air volume setting value a1 (step S53). When the detected temperature value is not less than the threshold value d (step S52, No), the cooling fan control unit 4 controls the cooling fan 3 so that the air volume of the cooling fan 3 becomes the air volume setting value a2 (step S54).

  As described above, in power supply system 100C of the fifth embodiment, the temperature of bidirectional power conversion unit 5 is monitored, and the air volume of cooling fan 3 is decreased as the temperature value of bidirectional power conversion unit 5 decreases. The cooling fan 3 is controlled. With this configuration, when the heat generation amount of the bidirectional power conversion unit 5 is small, that is, when the output current amount of the bidirectional power conversion unit 5 is small, the power consumption of the cooling fan 3 can be suppressed, and the electric power stored in the EV battery Can be reduced. In addition, noise reduction can be achieved by reducing the air volume of the cooling fan 3.

  In the first to fifth embodiments, the cooling fan 3 is used as a cooling means for the bidirectional power conversion unit 5 and the control power generation unit 7, and the amount of air generated in the cooling fan 3 is varied by the cooling fan control unit 4. However, the cooling method of the bidirectional power conversion unit 5 and the control power supply generation unit 7 is not limited to the air cooling method, and may be a water cooling method. When the cooling method using the water cooling method is used, in the power supply systems according to the first to fifth embodiments, for example, a water cooling pump that is a cooling unit is used instead of the cooling fan 3, and the water cooling pump control is performed instead of the cooling fan control unit 4. Part is used. In this case, the water cooling pump is disposed in a flow path through which the liquid refrigerant flows, and the flow path is disposed so as to be able to absorb heat generated in the bidirectional power conversion unit 5 and the control power generation unit 7. . In the power supply system using the current sensor 2, as in the first, second, and third embodiments, the water cooling pump control unit is controlled so that the rotation speed of the water cooling pump decreases as the current detection value decreases. That is, when the detected current value is small, the loss generated in the control power generation unit 7 that supplies power to the water-cooled pump can be reduced, and wasteful power loss can be reduced. In the power supply system using the voltage sensor 20, as in the fourth embodiment, the water cooling pump control unit is controlled so that the rotation speed of the water cooling pump decreases as the voltage detection value decreases, and wasteful power loss is reduced. Can be reduced. Further, in the power supply system using the temperature sensor 30, as in the fifth embodiment, the water cooling pump control unit is controlled so that the rotation speed of the water cooling pump decreases as the temperature detection value decreases, and wasteful power loss is reduced. Can be reduced. Moreover, although the EV battery which is a DC power source is connected to the power supply systems of Embodiments 1 to 5, the DC power source is not limited to the EV battery, and a DC power source such as a solar cell or a stationary storage battery installed in a house. A power source may be used, and the same effect can be obtained even when these storage batteries are used. Moreover, these storage batteries are not limited to those provided outside the power supply system, but may be those provided inside the power supply system. Moreover, although the rectifier 6 and the control power generator 7 are used in the power supply systems of the first to fifth embodiments, functions similar to those of the rectifier 6 instead of using the rectifier 6 and the control power generator 7 are used. A control power generation unit incorporating the above may be used as the control power generation unit 7. In the first, second, and third embodiments, the AC current is detected by the current sensor provided outside the cooling fan control unit 4, but the AC current is detected by the current detection means provided inside the cooling fan control unit 4. It may be configured to detect. In Embodiment 4, the voltage applied to the bidirectional power conversion unit is detected by the voltage sensor provided outside the cooling fan control unit 4. However, the voltage detection provided inside the cooling fan control unit 4 is detected. The voltage applied to the bidirectional power converter may be detected by the means. In the fifth embodiment, the temperature of the bidirectional power conversion unit is detected by a temperature sensor provided outside the cooling fan control unit 4, but both are detected by the temperature detection means provided inside the cooling fan control unit 4. The configuration may be such that the temperature of the direct power converter is detected.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  DESCRIPTION OF SYMBOLS 1 Circuit board, 2 Current sensor, 3 Cooling fan, 3a Air path, 4 Cooling fan control part, 5 Bidirectional power conversion part, 6 Rectification part, 7 Control power generation part, 8 Backup battery charging part, 9 Backflow prevention diode 10 switches, 11 backup batteries, 20 voltage sensors, 30 temperature sensors, 100, 100A, 100B, 100C power supply system, 200 EV, 300 residential load, 400 systems.

Claims (3)

A bi-directional power converter that converts and outputs DC power supplied from a DC power supply to AC power, converts AC power supplied from the system to DC power, and outputs;
A rectifying unit that outputs DC power for a control power source by AC power output from the bidirectional power converter or the system;
A control power source generating unit that generates a control power source using the power output from the rectifying unit;
A cooling means that operates with power supplied from the control power generation unit and cools at least one of the bidirectional power conversion unit and the control power generation unit;
As the current detection value of the alternating current output from the bidirectional power conversion unit or the current detection value of the alternating current input to the bidirectional power conversion unit decreases, the control power generation unit supplies the current to the cooling unit. A cooling means control unit for reducing power,
A current sensor for detecting an alternating current supplied from the bidirectional power converter to a residential load;
Equipped with a,
It said current sensor, said output stage of the bidirectional power conversion unit, a power supply system that will be disposed between the input stage of the control power generation unit. A current sensor for detecting an alternating current supplied from the system to the bidirectional power converter;
The cooling means control unit, a power supply system according to claim 1 for controlling the cooling means in response to a current detection value detected by the current sensor. The cooling means control unit, a power supply system according to claim 1 for controlling the cooling means in response to a current detection value detected by the current sensor.

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