JP2015089206A - On-vehicle charging system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle charging system which can suppress power consumption of a control device while not charging a battery in a connected state with a charging cable.SOLUTION: An on-vehicle charging system comprises: a charging apparatus 10 which charges a battery 20 with power supplied from an external power supply 90 via a charging cable 70; a CPU 34 which is started up in response to start up signals continuously transmitted via the charging cable 70 while the external power supply 90 and the charging apparatus 10 are electrically connected by the charging cable 70; and a switch 56 which is provided on a signal line L4 for receiving the start up signals input via the charging cable 70, and switches between opened state and closed state of the signal path. When the CPU 34 is started up in response to the start up signals, the CPU 34 determines whether to charge the high voltage battery 20, and when the CPU 34 determines not to charge the high battery 20, the CPU 34 outputs an instruction signal to the switch 56 to release the signal path.

Description

  The present invention relates to an in-vehicle charging system that is mounted on a vehicle and charges a battery with electric power supplied from an external power source.

  A battery mounted in an electric vehicle, a plug-in hybrid vehicle, or the like is charged in a state of being electrically connected to an external power source installed in a facility such as a house or a commercial power supply station via a charging cable. When the battery is fully charged by charging with an external power source, charging is stopped and the in-vehicle charging system is placed in a power saving standby state (sleep).

JP 2013-145735 A

  However, in a state where the charging cable and the battery are connected, a start signal (CPLT signal) that permits charging of the battery is continuously output from the charging cable regardless of the charging state of the battery. Therefore, in the control device on the in-vehicle charging system side, when the battery is not charged, the activation signal is kept while the charging cable is connected so that the battery charging operation is not started by the activation signal. It was necessary to continue monitoring. In this case, there arises a disadvantage that power consumption of the sub-battery by the control device occurs for monitoring the activation signal.

  This invention makes it a technical subject to provide the vehicle-mounted charging system which can suppress the power consumption of the control apparatus when not charging a battery in the connection state of a charging cable.

  In the present invention, in a state where the battery is charged by power supplied from an external power source through a charging cable, and the external power source and the charger are electrically connected by the charging cable, the charging A control device that is activated in response to an activation signal continuously transmitted from the cable, and a first switching unit that is provided in a signal path that takes in the activation signal that is input from the charging cable, and that switches between opening and closing the signal path; The control device includes: a charge determination unit that determines whether to charge the battery in a state where the control device is activated in response to the activation signal; and Command means for outputting a command signal for opening the signal path to the first switching means when it is determined not to perform the operation.

  In the above invention, when it is determined that charging is not performed, the control device outputs a command signal for opening the signal path to the first switching means. When the signal path is thus opened by the first switching means, the control device does not receive the start signal, and it becomes unnecessary to monitor the start signal. Thereby, the control device can be shifted to a standby state (sleep state), and power consumption can be reduced.

The schematic block diagram of a vehicle-mounted charging system. Schematic explanatory drawing of a control circuit. 6 is a flowchart of CPU activation state control. The flowchart of the stop cancellation | release process of CPU. The timing chart which shows the execution example of starting stop of CPU, and start stop cancellation.

  Hereinafter, an embodiment in which an in-vehicle charging system according to the present invention is applied to a vehicle (for example, a plug-in hybrid vehicle or an electric vehicle) including a rotating machine as an in-vehicle main unit will be described with reference to the drawings. FIG. 1 is an application example in the case where a battery provided in a vehicle is charged by power feeding from an external power supply 90 such as a charging stand. The external power supply 90 and the vehicle side are connected via a charging cable 70. Indicates the state.

  The external power supply 90 includes a power supply device 91 configured with an AC power supply, and power is output from the power supply device 91 to the outside via the charging cable 70.

  The vehicle side includes a charger 10, a high voltage battery 20, an ECU 30, and a sub battery 40.

  The charger 10 charges the high voltage battery 20 with the electric power of the external power supply 90, and includes a power conversion circuit 10a and a CPU 10b that controls the power conversion circuit 10a. The power conversion circuit 10a and the CPU 10b are connected via a signal line L5, and a command signal from the CPU 10b is input to the power conversion circuit 10a via the signal line L5.

  The power conversion circuit 10 a converts AC power supplied from the external power supply 90 into power that can charge the high-voltage battery 20. In other words, the power conversion circuit 10 a is configured to include an AC / DC circuit, a DC / DC circuit, and the like, and converts an AC voltage supplied from the external power supply 90 into a DC voltage and charges the DC voltage to the high-voltage battery 20. Boost to voltage.

  The CPU 10b is connected to the ECU 30 via the signal line L1, receives a command signal from the ECU 30 input via the signal line L1, performs power conversion by an AC / DC circuit or a DC / DC circuit, A signal indicating the state of the charger 10 is output to the ECU 30 side via the line L1. Further, in the case where the charging start time is set by the timer, the charging start time of the high voltage battery 20 is controlled.

  An inlet 12 connected to one end of the charging cable 70 is provided on the input side of the power conversion circuit 10 a of the charger 10. The inlet 12 and the charger 10 are connected via power lines P1 and P2. The inlet 12 and the ECU 30 are connected via signal lines L3 and L4. Thereby, when the inlet 12 and the charging cable 70 are connected, the electric power supplied from the external power supply 90 is supplied to the charger 10 via the power lines P1 and P2. Further, the signal output from the charging cable 70 is input to the ECU 30 via the signal lines L3 and L4.

  The signal line L3 transmits a connection signal, which is output when a later-described switch 71a included in the charging cable 70 is turned on, to the ECU 30. The signal line L4 is a signal path that is electrically connected to a signal line of a CCID 70a, which will be described later, with the charging cable 70 connected thereto, and transmits an activation signal output from the CCID 70a to the ECU 30. In the present embodiment, a switch 56 for switching the electrical connection between the CCID (Charging Circuit Interrupt Device) 70a and the ECU 30, that is, the opening and closing of the signal path, is provided in the middle of the signal line L4 that is the signal path. (See FIG. 2). By switching the switch 56 on and off, the presence / absence of an activation signal input to the ECU 30 is switched.

  The high voltage battery 20 is a secondary battery configured to be rechargeable, and is, for example, a lithium ion storage battery, a nickel hydride storage battery, or the like. The high-voltage battery 20 is an assembled battery composed of battery cells (unit cells) connected in series, and the voltage between the terminals is set to several hundred volts. The charging power of the high-voltage battery 20 is supplied to a motor generator or the like, and drive wheels connected to the rotor of the motor generator are rotated (not shown).

  A monitoring device 21 is connected to the high voltage battery 20. Based on the output voltage of the high-voltage battery 20, the monitoring device 21 detects the charge state of the high-voltage battery 20, such as whether the high-voltage battery 20 is in a chargeable state or whether it is fully charged and cannot be charged. To do. The monitoring device 21 and the ECU 30 are connected via a signal line L2. Thereby, a signal (monitoring signal) indicating the monitoring state of the high voltage battery 20 detected by the monitoring device 21 is input to the ECU 30 via the signal line L2.

  The sub-battery 40 supplies electric power to various electrical components mounted on the vehicle in addition to the ECU 30. The sub-battery 40 and the ECU 30 are connected via the power line P4, and supply power to the ECU 30 via the power line P4. The voltage between the terminals of the sub battery 40 is lower than the voltage of the high voltage battery 20 and is, for example, 12V to 14V. The sub-battery 40 is charged with regenerative power generated when the high-voltage battery 20 is charged or when the vehicle travels. That is, the sub battery 40 is not charged when the charging of the high voltage battery 20 is stopped.

  The ECU 30 includes a CPU 34, a storage device 33 that stores the state of the high-voltage battery 20 (such as a charging state), and a control circuit 50. The storage device 33 and the control circuit 50 are connected to the CPU 34, respectively. Yes.

  The state of the charger 10 is input to the CPU 34 through the signal line L1, and the monitoring signal of the high voltage battery 20 is input through the signal line L2. Further, a connection signal (PISW) is input via the signal line L3, and a start signal (CPLT) is input via the signal line L4. The CPU 34 is connected to the sub battery 40 through the power line P4 and is driven by the power of the sub battery 40. The power line P4 is provided with a switch 55 that switches the connection state between the CPU 34 and the sub battery 40 (see FIG. 2).

  The CPU 34 determines whether the high voltage battery 20 can be charged as the charge determination means in a state where the CPU 34 is activated in response to the connection signal and the activation signal input via the signal lines L3 and L4. At this time, if it is determined that the high voltage battery 20 can be charged, the charging start is permitted. On the other hand, if it is determined that charging of the high voltage battery 20 is not possible, a command signal (CPLT invalid signal) for opening the signal path of the signal line L4 is output to stop the input of the activation signal to the CPU 34. To do.

  A control circuit 50 is connected to the CPU 34. The state of the control circuit 50 is changed based on a signal output from the CPU 34. For example, in accordance with a command signal from the CPU 34, switching of the signal path of the signal line L4 connecting the CPLT circuit 76 and the CPU 34 is switched, or switching of the power path of the power line P4 connecting the sub battery 40 and the CPU 34 is switched. Or Details of the configuration of the control circuit 50 will be described later.

  The charging cable 70 includes a connector 71 connected to the vehicle inlet 12, a CCID 70 a that controls the presence / absence of power supply between the external power supply 90 and the device on the vehicle side, and members constituting the charging cable 70. The electric wire part 73 electrically connected is comprised.

  The connector 71 is provided with a switch 71 a on the connection side with the inlet 12. The switch 71a is turned on when the connector 71 and the inlet 12 are connected, and electrically connects the connector 71 and the CPU 34 via the signal line L3. A power source V1 is connected to the signal line L3, and the ECU 30 determines the charging cable 70 based on a potential change (connection signal) of the signal line L3 that occurs when the connector 71 and the inlet 12 are electrically connected. And that the charger 10 is connected. Note that the potential of the power supply V1 can be set to such a small potential that the CPU 34 can detect the voltage fluctuation of the signal. For example, it is assumed that the potential of the power supply V1 is 5V.

  The CCID 70a includes a relay 75 and a control pilot circuit (CPLT circuit 76). The relay 75 is provided for each power line in the charging cable 70. When the relay 75 is on, power can be supplied from the external power supply 90 to the charger 10 via the power line in the charging cable 70. When relay 75 is off, the power line in charging cable 70 is disconnected, and power supply from external power supply 90 to charger 10 is stopped.

  The CPLT circuit 76 outputs an activation signal (generally also referred to as an activation signal) for activating the CPU 34, and switches the relay 75 on and off according to charging permission information transmitted from the CPU 34. That is, when the charging cable 70 and the charger 10 are connected, the signal line in the charging cable 70 and the signal line L4 on the vehicle side are electrically connected, and an activation signal is sent to the CPU 34 via the signal line L4. Entered. The CPU 34 is activated in response to the activation signal, and charging by the charger 10 can be controlled.

  On the other hand, the CPU 34 determines whether or not to allow power supply from the external power source 90 based on the state of the charger 10 and the state of the high voltage battery 20 received via the signal lines L1 and L2, and determines the determination result. And output as charging permission information. That is, the CPU 34 changes the potential level of the activation signal transmitted at a predetermined duty ratio so that charging permission / prohibition is transmitted to the CPLT circuit 76 side. At this time, the CPU 34 transmits the presence / absence of power supply to the CPLT circuit 76 by changing the potential level of the start signal without changing the potential level of the start signal when permitting charging, and changing the potential level of the start signal when not permitting power supply. . For example, when the activation signal output from the CPLT circuit 76 is 12V, the potential level of the activation signal remains 12V when power supply is permitted. On the other hand, when the power supply is not permitted, the potential level of the activation signal is changed to 9 V, for example. Although not shown, the signal line L4 is provided with a resistor circuit for adjusting the potential level of the signal line L4, and the resistance adjustment of the resistor circuit is performed by the CPU.

  The CPLT circuit 76 switches the relay 75 on and off based on the potential level of the activation signal. That is, when there is no change in the potential level of the activation signal, the relay 75 is turned on so that power is supplied to the charger 10. When there is a change in the potential level of the activation signal, the relay 75 is turned off so that power supply to the charger 10 is not performed.

  By the way, in a state where the charging cable 70 and the CPU 34 are connected through the signal path of the signal line L4, the activation signal is continuously input to the CPU 34 regardless of whether or not the high voltage battery 20 is charged. In other words, the CPU 34 is activated even after it is determined that the high voltage battery 20 is fully charged or after it is determined that the operation of the charger 10 is abnormal and the high voltage battery 20 is not charged. The signal is continuously input. In this case, the CPU 34 must continue to monitor the activation signal, causing a problem that the power of the sub battery 40 is unnecessarily consumed. For example, when the high voltage battery 20 is charged at midnight or the like, it is determined that charging of the battery is unnecessary, and then the monitoring of the activation signal by the CPU 34 is continued for a long time, so that the sub battery 40 is raised. There is also a concern that this will occur.

  Therefore, in this embodiment, when the CPU 34 determines not to charge, the CPU 34 outputs a CPLT invalid command signal. As a result, the state of the control circuit 50 to be described later is switched so that the signal path (signal line L4) for supplying the activation signal from the CPLT circuit 76 to the CPU 34 is opened. In this case, when the activation signal is not input to the CPU 34, the monitoring of the activation signal by the CPU 34 is stopped. Thereby, the CPU 34 can be shifted to a standby state (sleep state), and unnecessary power consumption of the sub battery 40 can be reduced.

  Next, the control circuit 50 will be described. 2, the control circuit 50 includes an AND circuit 51, an OR circuit 52, an off-edge detection circuit 53, a latch circuit 54, and switches 55 and 56.

  The AND circuit 51 electrically connects the CPU 34 and the sub-battery 40 on condition that a connection signal indicating that the external power supply 90 and the charger 10 are electrically connected by the charging cable 70 is input. It is connected to supply power to the CPU 34. A signal line L3 and a signal line L4 are connected to the input side of the AND circuit 51, and a connection signal and an activation signal are input. The AND circuit 51 is at a high level when both the connection signal and the activation signal are at a high level, and is at a low level when either of the connection signal and the activation signal is at a low level.

  Connected to the input side of the OR circuit 52 are an output side of the AND circuit 51, an off-edge detection circuit 53, and a signal line L6 connected to a drive switch (not shown) for driving the power source of the in-vehicle electronic device. The output side of the OR circuit 52 is connected to a switch 55 that switches between opening and closing the power path of the power line P4 connecting the CPU 34 and the sub-battery 40.

  The OR circuit 52 goes high when the output of the AND circuit 51 is high, the signal line L6 is high, or the off-edge detection circuit 53 is high, and the switch 55 Turn on. When both inputs are at a low level, the OR circuit 52 is at a low level and the switch 55 is turned off. The signal line L6 is at a high level when the drive switch is on. When the switch 55 is on, the sub battery 40 and the CPU 34 are electrically connected, and the CPU 34 is driven by the power of the sub battery 40. When the switch 55 is off, the sub battery 40 and the CPU 34 are electrically disconnected, and the supply of electric power to the CPU 34 is stopped, so that the ECU 30 is stopped.

  The latch circuit 54 is connected to the CPU 34 on the input side and the switch 56 on the output side. Note that the latch circuit 54 latches the logic level (high level or low level) of the command signal from the CPU 34, and switches the switch 56 on and off by outputting the latched signal. That is, when the command signal (CPLT invalid signal) is not output from the CPU 34, the latch circuit 54 maintains the switch 56 in the ON state. In this case, the activation signal output from the CPLT circuit 76 is input to the CPU 34 by closing the signal line L4. On the other hand, when a command signal is output from the CPU 34, the latch circuit 54 latches the state of the switch 56 off. In this case, the open state of the signal line L4 is maintained, and the input of the activation signal output from the CPLT circuit 76 to the CPU 34 is stopped.

  As described above, the switching operation of the switch 56 is performed by the latch circuit 54, so that even if the operation of the CPU 34 is stopped due to the power supply stop due to the switch 56 being turned off (opened), the CPU 34 is stopped. The open state of the switch 56 after the stop (pause) is maintained, and accordingly, the CPU 34 can be maintained in a desired pause state.

  The off-edge detection circuit 53 detects a signal (off-edge) that is output when the charging cable 70 is switched to the non-connection, and the input side is connected to the signal line L3 and the output side is connected to the OR circuit 52. It is connected. The off-edge detection circuit 53 outputs a pulse signal by temporarily changing to a high level when the signal indicating the connection state of the charging cable 70 is switched from a high level (connected state) to a low level (not connected state). To do.

  When a pulse signal is output from the off-edge detection circuit 53, the OR circuit 52 temporarily switches the switch 55 from off (open) to on (closed). At this time, the power path of the power line P4 is temporarily switched from the open state to the closed state. As a result, the CPU 34 is temporarily activated by the power supplied from the sub battery 40.

  At this time, if the input of the activation signal is invalidated by the CPU 34, the CPU 34 cancels the command signal (CPLT invalid signal) and changes the state of the latch circuit 54. When the charging cable 70 is disconnected in this way, the invalidation of the activation signal by the CPU 34 is canceled, so that the normal charging process can be performed thereafter.

  In the in-vehicle charging system having the above configuration, a stop process of the CPU 34 and a stop release process of the CPU 34 will be described.

  FIG. 3 is a flowchart of the stop process of the CPU 34. First, in step S10, it is determined whether or not the charging cable 70 is connected. The connection of the charging cable 70 is determined based on the presence or absence of a connection signal. If a connection signal is input and an affirmative determination is made, the process proceeds to step S11 to determine whether the high voltage battery 20 is in a charged state. Here, based on the state of the charger 10 input via the signal line L1, it is determined whether the battery is currently charged. When an affirmative determination is made, the process proceeds to step S12, and it is determined whether or not to charge the high voltage battery 20 from now on. Whether or not charging is performed is determined based on a monitoring signal input from the monitoring device 21. For example, when the high voltage battery 20 is fully charged or when there is an abnormality in the charged state of the high voltage battery 20, it is determined that the high voltage battery 20 is not charged. If the determination is affirmative, the process proceeds to step S13, and a command signal (CPLT invalid signal) for stopping the input of the activation signal is output.

  FIG. 4 is a flowchart of the stop release process of the CPU 34. When the power supply of the CPU 34 is stopped by the CPLT invalid signal and the power supply is resumed by the off edge of the off edge detection circuit 53, the CPLT invalid signal is canceled. is there.

  First, in step S21, it is determined whether there is a command signal. Here, when the CPLT invalidation signal is output and the input of the start signal is stopped, it is determined that there is a command signal. If the determination is affirmative, the stop process is canceled in subsequent step S22. If a negative determination is made in step S21, this process ends.

  Next, an execution example of the above process will be described. FIG. 5 shows an execution example of the stop process and stop release process of the CPU 34. In the following description, it is assumed that the high voltage battery 20 is not fully charged and the charging control by the charger 10 is normal before time t1.

  When the charging cable 70 is connected at time t1, the switch 71a is turned on, and the signal line L3 becomes high level. At time t2, the activation signal from the CPLT circuit 76 is input to the CPU 34 via the signal line L4. As a result, the AND circuit 51 becomes high level, so that the switch 55 is turned on, and the power of the sub battery 40 is supplied to the CPU 34. Thereby, CPU34 will be in a drive state and will determine whether charging of high voltage battery 20 is permitted. Here, the CPU 34 determines that charging of the high voltage battery 20 is permitted. In this case, the CPLT circuit 76 switches the relay 75 on. As a result, AC power from the power supply device 91 is supplied to the charger 10. In the charger 10, the power conversion circuit 10 a converts AC power into a predetermined DC voltage to charge the high voltage battery 20.

  At time t3, the high voltage battery 20 is fully charged, and it is determined that the high voltage battery 20 is not charged. At this time, a command signal (CPLT invalid signal) is output from the CPU 34, and the potential level (logic level) of the command signal is latched by the latch circuit 54, so that the switch 56 is turned off. As a result, the signal path of the signal line L4 is opened and the input of the activation signal to the CPU 34 is stopped. Further, the AND circuit 51 becomes low level, and the switch 55 is switched off. As a result, the power path of the power line P4 is opened, and the power supply to the ECU 30 by the sub battery 40 is stopped.

  At time t4, when the user removes the charging cable 70 to detect a signal (off edge) indicating the disconnected state of the charging cable 70, the switch 55 is turned on by the pulse signal output from the off edge detection circuit 53. Then, the power path of the power line P4 is temporarily closed, and the CPU 34 is temporarily activated by the power supplied from the sub battery 40. At this time, if there is a command signal from the CPU 34, the CPU 34 cancels the output of the command signal (CPLT invalidation signal). Along with this, the state of the latch circuit 54 is switched, and the switch 56 is turned on. As a result, the signal path of the signal line L4 is closed, and the signal from the CPLT circuit 76 is returned to a state where it can be input to the CPU 34. Then, when the energization of the CPU 34 elapses for a predetermined time ΔT, that is, when the output of the pulse signal is completed, the switch 55 is turned off to stop the power supply to the CPU 34 and the CPU 34 is turned off again.

  Thereafter, the electric power of the high voltage battery 20 is used as the vehicle travels. When the charging cable 70 is connected again at time t5, a connection signal is input to the CPU 34 via the signal line L3, and an activation signal output from the CPLT circuit 76 is input to the CPU 34 via the signal line L4. Is done. In this case, the switch 55 is turned on, and the CPU 34 is driven by the power from the sub battery 40. And the determination of the charge condition of the high voltage battery 20 is started.

  According to the above, the following excellent effects can be obtained.

  (1) When the switch 56 as the first switching means is provided in the signal line L4 that is a signal path for taking in the activation signal input from the charging cable 70, and it is determined that charging is not performed, the signal path to the switch 56 A command signal for opening (signal line L4) is output. When the signal path is opened by the switch 56 in this manner, the CPU 34 does not input the activation signal, and it becomes unnecessary to monitor the activation signal. As a result, the CPU 34 can be shifted to a standby state (sleep state), and power consumption can be reduced.

  (2) When the CPLT signal path is opened by the switch 56 in response to a command signal (CPLT invalid signal) from the CPU 34, the output of the AND circuit 51 is set to low, and the switch 55 is turned off (opened) in accordance with the low output. Thus, the power supply from the sub battery 40 to the CPU 34 is stopped. Thereby, the power consumption of the sub battery 40 in the state which has stopped reception of the starting signal can be suppressed appropriately.

  (3) A latch circuit 54 that takes in a command signal (CPLT invalid signal) output from the CPU 34 is provided. The latch circuit 54 latches the logic level of the command signal and outputs the latched signal to Switching was implemented. As a result, even if the operation of the CPU 34 is suspended due to power supply stoppage due to the switch 56 being turned off (opened), the open state of the switch 56 after the suspension is maintained, and the CPU 34 can be maintained in a desired halt state.

  (4) When the connection signal (signal indicating the connection state of the charging cable 70) switches from high to low, the off-edge detection circuit 53 outputs a pulse signal, and the switch 55 is temporarily turned off (opened) by the pulse signal. ) To on (closed). Further, when the CPU 34 is temporarily activated in accordance with the switch operation, the command signal (CPLT invalid signal) is canceled (the same applies to the latch signal). Thereby, the state in which the activation signal is invalidated according to the completion of charging or the like can be canceled, and the normal charging process can be performed thereafter.

  The present invention is not limited to the description of the above embodiment, and may be implemented as follows.

  The off-edge detection circuit 53 may be omitted and the CPLT invalid state may be maintained even after the CPLT invalid command signal is output. In this case, the CPLT invalid state may be canceled on condition that the connection signal is switched from low to high.

  The power feeding device 91 may use power generated by sunlight, wind power generation, or the like.

  DESCRIPTION OF SYMBOLS 10 ... Charger, 34 ... CPU, 40 ... Sub battery, 56 ... Switch, 70 ... Charging cable, 76 ... CPLT circuit, 90 ... External power supply, V1 ... Power supply.

Claims (5)

A charger (10) for charging the battery (20) with electric power supplied from an external power source (90) via a charging cable (70);
A control device (34) activated in response to an activation signal continuously transmitted from the charging cable in a state where the external power source and the charger are electrically connected by the charging cable;
A first switching means (56) provided in a signal path for taking in the activation signal input from the charging cable, and switching between opening and closing of the signal path;
With
The controller is
Charge determination means for determining whether or not to charge the battery in a state where the control device is activated in response to the activation signal;
Command means for outputting a command signal for opening the signal path to the first switching means when the charge judging means judges that the charging is not performed;
An in-vehicle charging system comprising: A sub-battery (40) for supplying power to the control device;
A second switching means (55) provided in a power path for supplying power from the sub-battery to the control device, and switching between opening and closing of the power path;
Switching execution means (51) for switching the second switching means;
With
When the signal path is opened by the first switching unit in response to a command signal from the command unit, the switching execution unit opens the power path by the second switching unit to connect to the control device. The in-vehicle charging system according to claim 1, wherein the power supply is stopped.   A latch means (54) for taking in the command signal output by the command means, latching the logic level of the command signal, and outputting the latched signal to switch the first switching means. The in-vehicle charging system according to Item 2. The switching execution unit is configured to input the power path by the second switching unit on condition that a connection signal indicating a state in which the external power source and the charger are electrically connected by the charging cable is input. Is closed and power is supplied to the control device,
An operation means (53) for operating the second switching means from a state where the power path is opened to a state where the power path is closed when the connection signal is switched from a signal indicating the connection state to a signal indicating the non-connection state. The in-vehicle charging system according to claim 2 or 3, characterized by comprising:   The control device is configured to switch the power when the connection signal is switched from a signal indicating a connection state to a signal indicating a non-connection state in a state where a command signal for opening the signal path is output by the command means. The in-vehicle charging system according to claim 4, wherein when the route is operated in a closed state, the command signal by the command unit is canceled.

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