WO2017126047A1

WO2017126047A1 - Power conditioner

Info

Publication number: WO2017126047A1
Application number: PCT/JP2016/051523
Authority: WO
Inventors: 佐々木　宏
Original assignee: 三菱電機株式会社
Priority date: 2016-01-20
Filing date: 2016-01-20
Publication date: 2017-07-27
Also published as: JP6505258B2; JPWO2017126047A1

Abstract

The power conditioner is equipped with: a main circuit which converts DC voltage into AC voltage and outputs the AC voltage to a first terminal; an AC/DC voltage converter which converts the AC voltage into a first DC voltage and outputs the first DC voltage to a second terminal; a secondary battery which is charged with the first DC voltage; a first DC/DC voltage converter which converts the first DC voltage into a second DC voltage; a control circuit which, upon detecting whether or not a voltage of the first terminal indicates a power failure state, generates a sleep signal; a voltage detection circuit which outputs as a voltage detection signal a magnitude relation between a voltage of the second terminal and a reference voltage; a second DC/DC voltage converter which converts a voltage of the secondary battery into a third DC voltage and supplies the third DC voltage to an external device; a current detection circuit outputs as a current detection signal a magnitude relation between a current of the external device and a reference current; and switches which open/close connection between the second terminal and the secondary battery on the basis of the sleep signal, the voltage detection signal, and the current detection signal, thereby connecting the second terminal with the secondary battery when a change in the current detection signal is detected while the voltage of the first terminal is in the power failure state and the second terminal and the secondary battery are in a non-connected state.

Description

Inverter

The present invention relates to a power conditioner used for an electric vehicle (hereinafter referred to as EV).

The EV power conditioner has a function of converting a DC voltage generated by a lithium ion storage battery built in an electric vehicle into an AC system voltage and supplying it to a domestic distribution board at the time of a system power failure. Electric power consumed by the EV power conditioner itself is also obtained from the AC system voltage. However, in the event of a power outage, if the electric vehicle has not returned to the home, or if it has returned, but has not started discharging, the EV power conditioner itself will be able to obtain power from the electric vehicle. Standby power is obtained from the storage battery built in the battery.

When the capacity of the storage battery is 12 Ah and the voltage of the storage battery is 24 V, if the standby power of the EV power conditioner including the microcomputer that is always operating is 24 W, a current of 24 W / 24 V = 1 A flows, The storage battery can maintain the standby operation only for 12 Ah / 1A = 12 h, that is, 12 hours. If the standby operation cannot be maintained, the EV power conditioner cannot be started, and an AC system voltage cannot be obtained even if an electric vehicle is connected thereafter.

To prevent this, when a power failure is detected, only the device start-up circuit is energized and the other control circuits are stopped to enter the sleep mode to reduce standby power. From the sleep mode state, the power failure recovery switch is pressed. A method has been proposed to return to the normal mode. Patent Document 1 describes a method of reducing standby power by shutting off the power supply of a microcomputer with a transistor in a sleep mode.

JP 2009-44841 A

However, in the case of equipment that is normally activated like an EV power conditioner, pressing an emergency switch that is not normally used when a power failure occurs means that a quick operation can be performed in an emergency. There was a problem of inhibiting. In addition, if a manual switch is used to start from the sleep state, standby power is not necessary, but there is a problem that a power failure is detected and the device cannot be automatically put into the sleep state.

The present invention has been made in view of the above, and an object of the present invention is to provide an EV power conditioner that can cancel a sleep state without newly providing a switch or button for canceling the sleep state. .

In order to solve the above-described problems and achieve the object, the present invention converts a DC voltage into an AC voltage and outputs it to a first terminal to which a system is connected, and is connected to the first terminal. The AC voltage output from the main circuit or system is converted to a first DC voltage and output to the second terminal; a storage battery stored by the first DC voltage; and a second terminal. Connected and operated by the first DC / DC voltage converter that converts the first DC voltage to the second DC voltage and the second DC voltage, and detects whether or not the voltage at the first terminal is in a power failure state And a voltage detection circuit that outputs a magnitude relationship between the voltage of the second terminal and the reference voltage as a voltage detection signal. The present invention provides a second DC / DC voltage converter that converts the voltage of the storage battery into a third DC voltage and supplies it to an external device, and an external device current that the second DC / DC voltage converter supplies to the external device; A current detection circuit that outputs a magnitude relationship with a reference current as a current detection signal; a switch that opens and closes a connection between the second terminal and the storage battery based on the sleep command signal, the voltage detection signal, and the current detection signal; A switch for connecting the second terminal and the storage battery when a change in the current detection signal is detected when the voltage at one terminal is in a power failure state and the second terminal and the storage battery are not connected; It is characterized by providing.

According to the present invention, it is possible to cancel the sleep state without newly providing a switch or button for canceling the sleep state.

The figure which shows the structure of the power conditioner 100 for EV concerning Embodiment 1 of this invention. Timing chart explaining state transition from normal time to occurrence of power failure and sleep state according to the first embodiment Timing chart explaining state transition from sleep state to start of independent operation according to first embodiment

Hereinafter, a power conditioner 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 diagram illustrating a configuration of an EV power conditioner 100 according to the first embodiment of the present invention. The EV power conditioner 100 includes a main circuit 16 that is a bidirectional power converter, and a power failure stop / recovery circuit 30 that controls operations when a power failure occurs and when the power failure occurs. The main circuit 16 and the power outage stop / return circuit 30 are connected together to the first terminal 18 connected to the system 20. The main circuit 16 which is a bidirectional power converter has both functions of converting an AC voltage into a DC voltage and converting a DC voltage into an AC voltage. An in-house distribution board 15 is also connected to the first terminal 18.

The power failure stop / recovery circuit 30 includes an AC (Alternating Current) / DC (Direct Current) power source 1 that is an AC / DC voltage converter, a switch A2 that is a first switch, and a DC that is a first DC / DC voltage converter. / DC power supply A3, storage battery 4, control circuit 5, AND circuit 10, current detection circuit 11, DC / DC power supply B12 as a second DC / DC voltage converter, and switch B13 as a second switch And a voltage V1 detection circuit 14 which is a voltage detection circuit. The control circuit 5 includes a power failure detection circuit 6, a sleep signal generation circuit 7, and a microcomputer 8.

The AC / DC power source 1 is connected to the first terminal 18. The AC / DC power supply 1 receives a system voltage V0, which is an AC voltage from the system 20, from the first terminal 18, and AC / DC converts the system voltage V0 to a battery voltage V1 that is a first DC voltage. Output to the two terminal 19. The DC / DC power supply A3 connected to the second terminal 19 and inputted with the battery voltage V1 DC / DC converts the battery voltage V1 into a control circuit power supply voltage V2 which is a second DC voltage suitable for the control circuit 5. .

The power failure detection circuit 6 detects the voltage at the first terminal 18 to detect whether or not a power failure occurs, and if it is in a power failure state, notifies the microcomputer 8 of a power failure detection signal indicating that a power failure has been detected. . The microcomputer 8 determines whether or not to put the storage battery 4 in the energized state based on the information on whether or not the power failure is given from the power failure detection circuit 6 and the elapsed time since the detection of the power failure. 7 to send a sleep command. The sleep command is a command for instructing to enter a sleep state. The sleep state is a microcomputer in which the second terminal 19 and the storage battery 4 are disconnected and the DC / DC power supply A3 is disconnected from the storage battery 4. 8 is the state which stopped operation | movement. The sleep state is a state for suppressing consumption of the storage battery 4 during a power failure. The sleep command signal output in response to the sleep command by the sleep signal generation circuit 7 that has received the sleep command is input to the AND circuit 10. The sleep command signal is a normal high signal, and is normally pulled up to be “H”. However, the sleep command signal is “L” only during a period when the sleep signal generation circuit 7 receives the sleep command from the microcomputer 8. . Thereafter, when the microcomputer 8 actually shifts to the sleep state, the microcomputer 8 stops its operation, so that the sleep command signal returns to “H”.

The voltage V1 detection circuit 14 detects the battery voltage V1, which is the voltage at the second terminal 19 input to the DC / DC power supply A3, and determines the magnitude relationship between the battery voltage V1 and a predetermined reference voltage Vref as a voltage detection signal. Output as. Specifically, it is determined whether or not the battery voltage V1 is equal to or higher than the reference voltage Vref, and a V1 detection signal that is a voltage detection signal is output to the AND circuit 10 as a determination result. Specifically, when V1 ≧ Vref, the V1 detection signal is “H”, and when V1 <Vref, the V1 detection signal is “L”.

The AND circuit 10 receives the sleep command signal from the sleep signal generation circuit 7 and the V1 detection signal from the voltage V1 detection circuit 14, calculates the logical product of both, and outputs the logical product to the switch A2.

The switch A2 performs an operation of connecting or disconnecting the DC / DC power source A3 and the storage battery 4 based on the output signal of the AND circuit 10. Specifically, when the output signal of the AND circuit 10 is “H”, it is switched to a short state, that is, a connected state, and when the output signal of the AND circuit 10 is “L”, it is opened, that is, switched to a disconnected state.

The storage battery 4 is a backup battery, and when the second terminal 19 and the storage battery 4 are connected, when the AC / DC power supply 1 outputs, the storage battery 4 is charged by the supplied battery voltage V1, and the AC / DC When the power source 1 is stopped, the battery voltage V1 is supplied to the DC / DC power source A3.

The DC / DC power supply B12 is a DC / DC converter that converts the voltage of the storage battery 4 into a third direct current voltage that is an appropriate voltage and supplies the third direct current voltage to the display device 9 that is an external device via the power supply line 21. Therefore, when the second terminal 19 and the storage battery 4 are connected and the voltage of the second terminal 19 is the battery voltage V1, the voltage of the storage battery 4 is also the battery voltage V1, so the DC / DC power supply B12 is The voltage V1 is converted into the appropriate voltage and supplied to the display 9.

The display unit 9 displays the operating state of the EV power conditioner 100 by a communication signal from the microcomputer 8. The display 9 also has a function of accepting a user operation and transmitting an instruction to the microcomputer 8. The display device 9 is composed of a device such as a touch panel, and operates as a user input / output device.

The current detection circuit 11 detects an external device current I1, which is an output current supplied from the DC / DC power supply B12 to the display 9, and determines the magnitude relationship between the external device current I1 and a predetermined reference current Iref as a current detection signal. Output as. Specifically, it is determined whether or not the external device current I1 is greater than or equal to the reference current Iref, and an I1 detection signal that is a current detection signal is output to the switch B13 as a determination result. Specifically, the I1 detection signal is “H” when I1 ≧ Iref, and the I1 detection signal is “L” when I1 <Iref. When the user operates the display 9, the external device current I1 consumed by the display 9 increases. Therefore, when the user operates the display 9, the external device current I1 changes, and when the current becomes equal to or higher than Iref, the I1 detection signal becomes “H”.

The switch B13 is connected between the second terminal 19 and the storage battery 4 in parallel with the switch A2, and is connected or disconnected between the second terminal 19 and the storage battery 4 based on the I1 detection signal. Perform the action. Specifically, when the I1 detection signal is “H”, the switch is switched to a short state, that is, a connection state, and when the I1 detection signal is “L”, the switch is switched to an open state, that is, a disconnection state. Since the switch B13 and the switch A2 are connected in parallel, the switch A2 and the switch B13 are actually disconnected between the second terminal 19 and the storage battery 4, that is, between the DC / DC power supply A3 and the storage battery 4. This is a case where “L” is input to both of them.

The microcomputer 8 controls the main circuit 16 by sending a main circuit control signal. The main circuit 16 is connected to the system 20 and the residential distribution board 15 via the first terminal 18. The main circuit 16 is also connected to the storage battery 17 in the electric vehicle via another terminal that is not connected to the first terminal 18. The main circuit 16 performs AC / DC conversion on the system voltage V0 output from the system 20 to the first terminal 18 to generate an EV battery voltage V3 and charges the storage battery 17 in the electric vehicle. Alternatively, the main circuit 16 performs DC / AC conversion from the EV battery voltage V3 generated by the storage battery 17 in the electric vehicle, generates a system voltage V0 and outputs it to the first terminal 18, and supplies power to the residential distribution board 15 Supply. Thus, the main circuit 16 functions as a bidirectional power converter.

When the system 20 is in a normal state where there is no power failure, the system voltage V0 is input from the system 20 to the AC / DC power source 1, and the AC / DC power source 1 outputs the battery voltage V1. The battery voltage V1 is input to the DC / DC power supply A3, and the DC / DC power supply A3 outputs the control circuit power supply voltage V2 and supplies it to the control circuit 5.

In the control circuit 5, when the system voltage V0 is a normal voltage, the power failure detection circuit 6 does not output a power failure detection signal to the microcomputer 8, and the microcomputer 8 sends a command to the sleep signal generation circuit 7 as a sleep command signal. Outputs “H”. In the normal state, since the battery voltage V1 is equal to or higher than the reference voltage Vref, the voltage V1 detection circuit 14 outputs “H” to the AND circuit 10 as a V1 detection signal. Since the AND circuit 10 to which “H” is given as the sleep command signal and “H” as the V1 detection signal outputs “H” to the switch A2, the switch A2 is short-circuited. Thereby, the battery voltage V1 is also supplied to the storage battery 4 via the switch A2, and the storage battery 4 is charged.

The switch B13 is connected between the second terminal 19 and the storage battery 4 in parallel with the switch A2. Therefore, since the switch A2 is short-circuited when the system 20 is in the normal state where there is no power outage, the storage battery 4 is connected to the DC / DC regardless of the connection state of the switch B13 regardless of the value of the external device current I1. It will be in the state connected with DC power supply A3.

At the time of power failure of the system 20, the EV power conditioner 100 detects the power failure and displays the power failure state on the display 9. Specifically, the power failure detection circuit 6 outputs a power failure detection signal to the microcomputer 8, and based on this, the microcomputer 8 displays on the display device 9 that the power failure has occurred.

In the event of a power failure, the user operates the display 9 and the microcomputer 8 transmits a main circuit control signal to the main circuit 16, whereby the main circuit 16 generates the system voltage V0 from the storage battery 17 in the electric vehicle. Is started immediately, the main circuit 16 outputs the system voltage V0.

On the other hand, if the electric vehicle cannot be immediately connected to the EV power conditioner 100 at the time of a power failure, the electric vehicle storage battery 17 cannot be immediately connected to the main circuit 16. If the system voltage V0 disappears for this reason, the output of the AC / DC power supply 1 stops because the system voltage V0 is not input to the AC / DC power supply 1, but the battery voltage V1 is output before the power failure. Therefore, since the V1 detection signal output from the voltage V1 detection circuit 14 is “H” and the switch A2 is in a short-circuit state, discharging starts from the storage battery 4 and the battery voltage V1 is supplied to the DC / DC power supply A3. The control circuit power supply voltage V2 is supplied from the DC / DC power supply A3 to the control circuit 5 in the same manner as before the power failure. In this state, since the control circuit 5 performs a standby operation using the storage battery 4 as a power source, the amount of power stored in the storage battery 4 continues to decrease, but the electric vehicle is connected to the EV power conditioner 100 and the user operates the display unit 9. When the autonomous operation is started, the AC / DC power supply 1 operates and outputs the battery voltage V1, so that the storage battery 4 is charged again.

On the other hand, when the self-sustained operation cannot be started immediately because the electric vehicle does not exist near the EV power conditioner 100 installation location, the main circuit 16 does not generate the system voltage V0 from the storage battery 17 in the electric vehicle. Is continued for a predetermined time Tref or longer, the microcomputer 8 detects this by the power failure detection signal of the power failure detection circuit 6, and sends a sleep command to the sleep signal generation circuit 7 to set the sleep command signal to "L". Instruct. Upon receiving the sleep command, the sleep signal generation circuit 7 outputs “L” as a sleep command signal to the AND circuit 10. Thus, the AND circuit 10 outputs “L” to the switch A2 regardless of the state of the V1 detection signal which is another input of the AND circuit 10. When the switch A2 to which "L" is input from the AND circuit 10 is in an open state and the switch B13 is also in an open state, the DC / DC power source A3 is disconnected from the storage battery 4 and the sleep state in which the microcomputer 8 stops operating. become. In the sleep state, neither the main circuit 16 nor the control circuit 5 operates, and the storage battery 4 supplies power to a limited circuit including the display 9 and the current detection circuit 11 via the DC / DC power supply B12.

When the electric vehicle becomes connectable to the EV power conditioner 100 and the user operates the indicator 9 to display the state of the EV power conditioner 100, the increase in the external device current I1 is detected by the current detection circuit 11. Is detected, "H" is output as the I1 detection signal, and the switch B13 is short-circuited. When the switch B13 is short-circuited, the storage battery 4 supplies power to the DC / DC power supply A3, and the DC / DC power supply A3 supplies power to the control circuit 5, so that the microcomputer 8 starts operating and sleeps. Is released.

FIG. 2 shows a timing chart of the state change from the normal time according to the first embodiment to the sleep state after the occurrence of a power failure. The horizontal axis in FIG. 2 is time, and the system voltage V0, power failure detection signal, sleep command signal, output of the AND circuit 10, switch A2, battery voltage V1, V1 detection signal, I1 detection signal, and switch B13 change over time. The situation is shown.

In FIG. 2, when a power failure occurs at time t1 and the system voltage V0 changes from a normal voltage to an abnormal voltage, the power failure detection signal output from the power failure detection circuit 6 to the microcomputer 8 changes from a non-detected state to a detected state. The microcomputer 8 sends a sleep command to the sleep signal generation circuit 7 at the time t2 when the detection state has been maintained for a predetermined time Tref from the time when the power failure detection signal changes from the non-detection state to the detection state. The sleep command signal output from the received sleep signal generation circuit 7 changes from “H” to “L” and maintains the state of “L” for a certain period. The V1 detection signal that is the output of the voltage V1 detection circuit 14 is “H” until time t2, and the output of the AND circuit 10 is “H” until time t2. However, since the sleep command signal becomes “L” after time t2, the output of the AND circuit 10 becomes “L”, and the switch A2 is opened. On the other hand, since the display 9 is not operated during the period from time t1 to time t2, the I1 detection signal output from the current detection circuit 11 is always “L” and the switch B13 is open. Therefore, since both the switch A2 and the switch B13 are opened at time t2, the DC / DC power supply A3 is disconnected from the storage battery 4 and enters the sleep state. When the sleep state is entered at time t2, the voltage of the battery voltage V1 becomes smaller than Vref, so the V1 detection signal that is the output of the voltage V1 detection circuit 14 becomes “L”. After the time t2, the control circuit power supply voltage V2 is not supplied to the microcomputer 8, so that the sleep command signal becomes “H” after maintaining the state of “L” for a certain period as described above, but V1 detection Since the signal is “L”, the output of the AND circuit 10 remains “L”, and the switch A2 maintains the open state. Further, since the control circuit power supply voltage V2 is not supplied to the control circuit 5 in the sleep state, the power failure detection signal that is the output of the power failure detection circuit 6 is “L”. Thus, after time t2, the sleep state is maintained.

FIG. 3 is a timing chart for explaining the state transition from the sleep state to the start of independent operation according to the first embodiment. The horizontal axis of FIG. 3 is time, system voltage V0, power failure detection signal, sleep command signal, output of AND circuit 10, switch A2, I1 detection signal, switch B13, battery voltage V1, V1 detection signal, control circuit power supply voltage The time changes of V2 and the main circuit control signal are shown.

The first state in FIG. 3 is the sleep state, which is the last state in FIG. That is, the system voltage V0 is an abnormal voltage, the power failure detection signal is not detected, the sleep command signal is “H”, the output of the AND circuit 10 is “L”, and the switch A2 and the switch B13 are Both are open. As described above, since the control circuit power supply voltage V2 is not supplied to the control circuit 5 in the sleep state, the control circuit power supply voltage V2 is “L” and the main circuit control signal is in the stop state in the first state of FIG. .

At time t3 in FIG. 3, when the user operates the display 9, the current detection circuit 11 detects an increase in the external device current I1, and sets the I1 detection signal to “H”. The switch B13 to which “H” is input as the I1 detection signal is in a short state, and the sleep state is released by connecting the storage battery 4 and the DC / DC power source A3. When the sleep state is released, the battery voltage V1 becomes “H” and becomes a voltage higher than Vref. Therefore, the V1 detection signal output from the voltage V1 detection circuit 14 becomes “H”. Further, when the battery voltage V1 becomes “H”, the control circuit power supply voltage V2 output from the DC / DC power supply A3 becomes “H”. When the control circuit power supply voltage V2 becomes “H”, the circuit operation of the control circuit 5 becomes possible, and the user can operate the display 9 to send an instruction to start a self-sustaining operation to the microcomputer 8.

Thereafter, at time t4 in FIG. 3, when the user operates the display 9 and sends an instruction to start the autonomous operation to the microcomputer 8, the main circuit control signal becomes the autonomous operation state, and the electric vehicle storage battery 17 The main circuit 16 generates the system voltage V0. Thereby, although the system | strain 20 is still a power failure state, the system voltage V0 returns to a normal voltage, and a power failure detection signal returns to a non-detection state.

The EV power conditioner 100 according to the first embodiment sleeps at the time of a power failure when the user displays an operation state of the EV power conditioner 100 or when the user operates the EV power conditioner 100. It has a circuit configuration that is recognized as an operation for returning from the state. As a result, the sleep state can be canceled without specially performing an operation necessary for returning from the sleep state at the time of a power failure that rarely occurs.

That is, without providing an emergency special switch, a change caused by a user operating the display unit 9 for operating during normal operation in the sleep state at the time of a power failure is detected, and the sleep state is canceled. . Thus, in the event of an emergency such as a power failure, the user can cancel the sleep state without requiring operations such as operating switches or buttons that are not operated during normal times or looking at a special manual.

As described above, according to the EV power conditioner 100 according to the first embodiment, a new device such as a switch or a button for releasing sleep while having a function of automatically shifting to the sleep state at the time of a power failure. Do not need. In the sleep state, only the activation circuit needs to be energized, and thus there is a problem that power used for that is consumed. However, according to the EV power conditioner 100 according to the first embodiment, the sleep circuit is in the sleep state. In the state, since it is not necessary to supply power to the control circuit 5 and only the limited power consumed by the display unit 9 is consumed, the power consumed by the power failure stop and recovery circuit 30 can be suppressed. In addition, since the operation performed on the display device 9 for canceling the sleep state is a normally performed operation, there is an effect that even if the operation is performed when the sleep state is not set, no malfunction is caused.

In the above description, the control circuit 5 has been described as having a configuration in which the power failure detection circuit 6, the sleep signal generation circuit 7, and the microcomputer 8 are mounted. However, the control circuit 5 needs to be realized with such a configuration. There is no. Specifically, the microcomputer 8 may realize the functions of the power failure detection circuit 6 and the sleep signal generation circuit 7. In this case, only the microcomputer 8 is mounted on the control circuit 5.

In FIG. 1, the switch between the second terminal 19 and the storage battery 4 is composed of two switches including a switch A2 and a switch B13 connected in parallel. As a result, when the main switch A2 is configured to consume a large amount of power even in the standby state, the power supply to the switch A2 is completely cut off in the sleep state, and only the circuit of the switch B13 that requires a small amount of power consumption is used. An effect of reducing power consumption by supplying power can be obtained.

However, the switch between the second terminal 19 and the storage battery 4 is not necessarily composed of two switches. Specifically, one switch may be controlled using output signals of the AND circuit 10 and the current detection circuit 11. That is, it suffices to realize the same operation as when two switches are used by controlling one switch based on the sleep command signal, the V1 detection signal, and the I1 detection signal.

If the display 9 displays the operation state of the EV power conditioner 100 by a signal from the microcomputer 8, a display operation can be performed by a wired remote controller or at a remote location via a wireless transceiver. It can also be realized with a wireless remote control. In particular, when using a wireless remote controller, if the power source of the wireless transceiver is DC / DC power supply B12, radio waves from the wireless remote controller are received by the wireless transceiver by the operation of the wireless remote controller by the user. Since the power supply current of the wireless transceiver changes, the same effect as in the case of wired wiring can be obtained by causing the current detection circuit 11 to detect the change.

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.

1 AC / DC power supply, 2 switch A, 3 DC / DC power supply A, 4 storage battery, 5 control circuit, 6 power failure detection circuit, 7 sleep signal generation circuit, 8 microcomputer, 9 display, 10 AND circuit, 11 current detection Circuit, 12 DC / DC power supply B, 13 switch B, 14 voltage V1 detection circuit, 15 residential distribution board, 16 main circuit, 17 electric vehicle storage battery, 18 first terminal, 19 second terminal, 20 system, 21 power supply Line, 30 Power outage stop and return circuit, 100 EV power conditioner.

Claims

A main circuit that converts a DC voltage into an AC voltage and outputs it to a first terminal to which the system is connected;
An AC / DC voltage converter connected to the first terminal, converting the AC voltage output from the main circuit or the system into a first DC voltage and outputting the first DC voltage to the second terminal;
A storage battery stored by the first DC voltage;
A first DC / DC voltage converter connected to the second terminal for converting the first DC voltage into a second DC voltage;
A control circuit that operates with the second DC voltage, detects whether the voltage at the first terminal is in a power failure state, and generates a sleep command signal;
A voltage detection circuit that outputs a magnitude relationship between the voltage of the second terminal and a reference voltage as a voltage detection signal;
A second DC / DC voltage converter for converting the voltage of the storage battery into a third DC voltage and supplying the converted voltage to an external device;
A current detection circuit for outputting, as a current detection signal, a magnitude relationship between an external device current supplied by the second DC / DC voltage converter to the external device and a reference current;
Based on the sleep command signal, the voltage detection signal, and the current detection signal, a switch that opens and closes a connection between the second terminal and the storage battery, wherein the voltage at the first terminal is in a power failure state, and In a case where the second terminal and the storage battery are in a disconnected state, a switch that connects the second terminal and the storage battery when detecting a change in the current detection signal;
A power conditioner comprising:
The power conditioner according to claim 1, wherein the control circuit includes a power failure detection circuit that detects whether or not the voltage of the first terminal is in a power failure state, and a microcomputer that controls the main circuit.
The switch includes a first switch and a second switch connected in parallel between the second terminal and the storage battery,
The first switch is controlled by the sleep command signal and the voltage detection signal,
The power conditioner according to claim 1 or 2, wherein the second switch is controlled by the current detection signal.