Abnormality detection device, in-vehicle charger, and abnormality detection method

Abstract

To detect a sensor abnormality without adding a redundant sensor.SOLUTION: An abnormality detection device comprises a sensor and a control circuit. The sensor is electrically connected to a power line. The power line is bi-directionally supplied with power from an external power source during charging of an in-vehicle battery and from an in-vehicle battery to an external load during discharging. The sensor is configured such that, when no charging or discharging power is supplied to the power line, the output is offset so that a sensor value of an applied offset voltage is output, and a sensor value according to the current or voltage of the charging or discharging power supplied to the power line is output. The control circuit detects an abnormality of the sensor when the sensor value in a state where no charging or discharging power is supplied to the power line differs from the offset voltage.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present disclosure relates to an abnormality detection device, an on-board charger, and an abnormality detection method. [Background technology]

[0002] On-board chargers must maintain constant input and output current values ​​by monitoring the current sensor's detected values ​​(sensor values) and performing constant current control to ensure that the current value is equal to the requested current requested by the vehicle. If an abnormality occurs in the current sensor, the monitored sensor value may become inaccurate, causing the input and output current values ​​to exceed the requested current, potentially damaging the power supply device connected to the input side and the on-board battery and on-board components connected to the output side. For this reason, on-board chargers must constantly monitor the current sensor to ensure that it is operating normally.

[0003] For example, Patent Document 1 discloses a technique in which a current sensor is provided for detecting charge / discharge current in each of a plurality of batteries, and an abnormality in the current sensor is detected by comparing the detected values ​​of the current sensors. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-099033 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in a configuration where another sensor is added as a redundant sensor to monitor sensor abnormalities, there are problems such as increased costs and an increased component mounting area. For this reason, there is a demand for technology that can detect sensor abnormalities without adding a redundant sensor.

[0006] One of the problems that the present disclosure aims to solve is to detect a sensor abnormality without adding a redundant sensor. [Means for solving the problem]

[0007] The abnormality detection device according to the present disclosure includes a sensor and a control circuit. The sensor is electrically connected to a power supply line. The power supply line receives power bidirectionally from an external power source when charging an on-board battery and from the on-board battery when discharging to an external load. The sensor is configured to offset its output so that a sensor value of an applied offset voltage is output when no charging or discharging power is supplied to the power supply line, and to output the sensor value corresponding to the current or voltage of the charging or discharging power supplied to the power supply line. The control circuit detects an abnormality in the sensor when the sensor value when no charging or discharging power is supplied to the power supply line differs from the offset voltage.

[0008] According to the present disclosure, a sensor abnormality can be detected without adding a redundant sensor. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a charging system according to an embodiment. [Figure 2] FIG. 2 is a diagram illustrating an example of the configuration of the current sensor of FIG. [Figure 3] FIG. 3 is a diagram for explaining detection of a sensor abnormality based on the operating range of the current sensor of FIG. [Figure 4] FIG. 4 is a diagram illustrating an example of the configuration of the voltage sensor of FIG. [Figure 5] FIG. 5 is a diagram for explaining detection of a sensor abnormality based on the operating range of the voltage sensor of FIG. [Figure 6]FIG. 6 is a flowchart showing an example of the flow of a process executed by the control circuit of FIG. 1 to detect a power short-to-power or ground short-to-ground abnormality (sensor abnormality) of the current sensor. [Figure 7] FIG. 7 is a flowchart showing an example of the flow of a process executed by the control circuit of FIG. 1 to detect a power short-to-ground abnormality or a ground short-to-voltage abnormality (sensor abnormality) of the voltage sensor. [Figure 8] FIG. 8 is a diagram illustrating an example of the configuration of each of the current sensor and the voltage sensor in FIG. [Figure 9] FIG. 9 is a flowchart showing an example of the flow of a process for detecting a gain error (sensor abnormality) in a current sensor or a voltage sensor, which is executed by the control circuit of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, with reference to the drawings, embodiments of a self-diagnosis circuit, an abnormality detection device, a power conversion device (on-board charger), a vehicle, a charging system, an abnormality detection method, a program, and a recording medium according to the present disclosure will be described.

[0011] In the description of the present disclosure, components having the same or substantially the same functions as those described above with respect to the previously-mentioned drawings may be given the same reference numerals, and descriptions thereof may be omitted as appropriate. Furthermore, even when the same or substantially the same parts are shown, the dimensions and proportions may be different depending on the drawing. Furthermore, for example, in order to ensure the visibility of the drawings, reference numerals may be given to only the main components in the description of each drawing, and reference numerals may not be given to components having the same or substantially the same functions as those described above with respect to the previously-mentioned drawings.

[0012] In the description of the present disclosure, components having the same or substantially the same functions may be distinguished by adding an alphanumeric character to the end of the reference symbol. Alternatively, when multiple components having the same or substantially the same functions are not distinguished, they may be collectively described by omitting the alphanumeric character at the end of the reference symbol.

[0013] (First embodiment) Fig. 1 is a diagram showing an example of the configuration of a charging system 1 according to an embodiment. As shown in Fig. 1, the charging system 1 includes a vehicle 2, a load 8, and a power supply device 9. The vehicle 2 also includes an on-board charger 3 and a battery 7.

[0014] In the vehicle 2, the on-board charger 3 is electrically connected to the battery 7 via multiple power supply lines L and N. For example, a switch 61 may be provided on the power supply line L between the on-board charger 3 and the battery 7. The switch 61 operates in accordance with a control signal from, for example, a control circuit 31 to switch between conduction and interruption between the on-board charger 3 and the battery 7. The switch 61 is not limited to the control circuit 31, but may also operate in accordance with a control signal from a control circuit mounted outside the on-board charger 3 in the vehicle 2, such as an arbitrary on-board ECU (Electronic Control Unit). Alternatively, the switch 61 may operate in accordance with a control signal from outside the vehicle 2, such as the power supply device 9. The control signal from outside the on-board charger 3 may be supplied directly to the switch 61, or may cause the control circuit 31 to output a control signal to the switch 61. The switch 61 is not an essential component and may not be provided.

[0015] The on-board charger 3 is configured to be electrically connectable to a load 8 and a power supply device 9 connected to the vehicle 2. Specifically, the on-board charger 3 is electrically connected to an AC socket of the vehicle 2 or an in-vehicle socket (not shown) via a plurality of power supply lines L and N. The load 8 or the power supply device 9 is electrically connected to the AC socket of the vehicle 2 via a connection cable such as a charging cable.

[0016] In the charging system 1, AC power is supplied to the multiple power supply lines L, N from an external power supply device 9 when charging the vehicle 2. Furthermore, AC power based on DC power from the battery 7 is supplied to the multiple power supply lines L, N when discharging the vehicle 2. In other words, power is supplied to the multiple power supply lines L, N in both directions: from the power supply device 9 when charging the battery 7, and from the battery 7 when discharging to the load 8 or the power supply device 9.

[0017] As an example, single-phase AC power is supplied to a plurality of power supply lines L and N. For example, the power supply line L is a voltage line through which a single-phase current from a single-phase AC power supply flows. For example, the power supply line N is a neutral line electrically connected to both the single-phase AC power supply and the ground potential.

[0018] As an example, the multiple power supply lines L and N may be configured to be able to supply three-phase AC power. In this case, the power supply line L includes, for example, multiple power supply lines L1 to L3 (not shown). For example, the power supply line L1 is a voltage line through which a single-phase current from a single-phase AC power supply or, for example, a U-phase (first phase) current from a three-phase AC power supply flows. For example, the power supply line L2 is not electrically connected to the single-phase AC power supply and is a voltage line through which, for example, a V-phase (second phase) current from a three-phase AC power supply flows. For example, the power supply line L3 is not electrically connected to the single-phase AC power supply and is a voltage line through which, for example, a W-phase (third phase) current from a three-phase AC power supply flows. For example, the power supply line N is a neutral line electrically connected to each of the single-phase or three-phase AC power supply and a ground wire at ground potential. This ground wire at ground potential may be, for example, a ground wire that is functionally grounded to a metal chassis of the vehicle 2.

[0019] As an example, the AC socket (not shown) of the vehicle 2 is, for example, a power socket (inlet / outlet) for charging and discharging the vehicle 2. The AC socket is provided, for example, in a position accessible from outside the vehicle 2. For example, the AC socket is connected to a power supply device 9 when charging the vehicle 2. For example, the AC socket is connected to a load 8 or a power supply device 9 when discharging power from the vehicle 2. As an example, the AC socket of the vehicle 2 is compatible with both single-phase and three-phase AC power, but may be compatible with either one of the AC powers.

[0020] As an example, the in-vehicle socket (not shown) of the vehicle 2 is a power socket (outlet) for discharging power in the vehicle 2. The in-vehicle socket is provided, for example, inside the passenger compartment (inside the vehicle) of the vehicle 2. For example, the in-vehicle socket is connected to the load 8 when discharging power from the vehicle 2. As an example, the in-vehicle socket of the vehicle 2 is compatible with single-phase AC power, but may be compatible with both single-phase and three-phase AC power.

[0021] The vehicle 2 may be any of various electric vehicles (EVs), such as a battery electric vehicle (BEV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV).The vehicle 2 may also be any of various mobile bodies configured to be driven using power from an on-board battery 7, such as a passenger car, a freight vehicle, a van, a motorcycle, or an electric kick scooter.

[0022] The technology according to the embodiment is not limited to the on-board charger 3 mounted on the vehicle 2, but may also be applied to various power conversion devices provided in, for example, aircraft, amusement facilities, uninterruptible power supplies, and the like.

[0023] The vehicle 2 may be configured to operate on-board equipment (electrical equipment) using power from the battery 7, for example. Examples of the on-board equipment include a navigation system, an audio system, an air conditioner, power windows, a defogger, an ECU, a GPS (Global Positioning System) module, and an on-board camera.

[0024] The on-board charger 3 is a power conversion device mounted on the vehicle 2. The on-board charger 3 may be configured to be operable with either single-phase AC power or three-phase AC power, for example. For example, the on-board charger 3 converts single-phase or three-phase AC power supplied from the power supply device 9 into DC power and supplies the DC power to the battery 7. The on-board charger 3 also converts DC power from the battery 7 into AC power and supplies the single-phase or three-phase AC power to a load 8 connected to an AC socket or an in-vehicle socket (not shown) of the vehicle 2.

[0025] The on-board charger 3 does not have to be compatible with both single-phase and three-phase, and may be configured to be operable with either one. Furthermore, the on-board charger 3 is not limited to single-phase and three-phase (multiple-phase) AC power, and may be configured to be operable with two-phase (multiple-phase) AC power.

[0026] The battery 7 is an example of an on-board battery mounted on the vehicle 2. The battery 7 stores power supplied from the power supply device 9 via the on-board charger 3. The battery 23 only needs to store power to supply power to a traction motor (main motor) and electrical components mounted on the vehicle 2, or to a load 8 connected to an AC socket or an in-vehicle socket (not shown) of the vehicle 2. Any battery, such as a lithium-ion battery, a nickel-metal hydride battery, or an all-solid-state battery, can be used as the battery 7.

[0027] The load 8 is an example of an external load to which power is supplied from the battery 7 during discharge. The load 8 is detachably connected to an AC socket or an in-vehicle socket (not shown) of the vehicle 2. The load 8 may be an electronic device that receives power from the vehicle 2, such as a home appliance or a smartphone. The load 8 may also be an external power storage device or power facility that receives power from the vehicle 2, such as a home storage battery or a power purchasing device of a charging station. The power purchasing device of a charging station serving as the load 8 may be realized by a power supply device 9.

[0028] The power supply device 9 is an example of an external power source that supplies power to the battery 7 during charging. The power supply device 9 is any AC power source, such as a power source installed in a quick charging facility or a commercial power source. Note that the power supply device 9 is not limited to a single-phase AC power source or a three-phase AC power source (multiple-phase AC power source), and a two-phase AC power source (multiple-phase AC power source) may also be used. As an example, FIG. 1 illustrates a case where a single-phase AC power source that supplies single-phase AC power to an on-board charger 3 (power conversion device) of a vehicle 2 is used as the power supply device 9.

[0029] As shown in FIG. 1 , power supply device 9 has an AC voltage source 91 and a switch 93. AC voltage source 91 generates AC power to be supplied to vehicle 2. Switch 93 is electrically connected between AC voltage source 91 and an output terminal of power supply device 9 electrically connected to power supply line L. Switch 93 operates in accordance with a control pilot (CP) signal from control circuit 31, and switches between conduction and interruption between AC voltage source 91 and power supply line L. In other words, switch 93 switches between supplying and not supplying AC power from AC voltage source 91 to power supply line L.

[0030] As shown in Fig. 1, the on-board charger 3 has a control circuit 31, a power factor correction (PFC) circuit 32, and a DC-DC conversion circuit 33. Note that the on-board charger 3 according to the present disclosure is not limited to the configuration shown in Fig. 1 and may have other configurations. For example, the power factor correction circuit 32 is not an essential component of the on-board charger 3, and other rectifying and smoothing circuits may be used.

[0031] The control circuit 31 controls the operation of the on-board charger 3. For example, the control circuit 31 acquires outputs (sensor values) of the current sensors 321, 331 and the voltage sensors 323, 333 before, during, and after charging and discharging. For example, the control circuit 31 monitors the acquired sensor values. For example, the control circuit 31 controls the on / off of the power factor correction circuit 32 and the DC-DC conversion circuit 33 and the amount of power conversion by outputting a control signal. For example, the control circuit 31 controls the on / off of the switches 61, 93 by outputting a control signal.

[0032] Furthermore, the control circuit 31 stops charging and discharging when the charging power or discharging power (charging and discharging power) exceeds a predetermined operating range. For example, when the charging power supplied to the power supply lines L and N during charging exceeds the operating range, the control circuit 31 outputs a control signal to the power factor correction circuit 32 and / or the DC-DC conversion circuit 33 to stop power conversion (charging operation). For example, when the charging power supplied to the power supply lines L and N during charging exceeds the operating range, the control circuit 31 stops the power conversion (charging operation), and then outputs a control signal (CP signal) to the power supply device 9 to stop (disrupt) the supply of AC power to the power supply lines L and N. For example, when the discharging power supplied to the power supply lines L and N during discharging exceeds the operating range, the control circuit 31 outputs a control signal to the power factor correction circuit 32 and / or the DC-DC conversion circuit 33 to stop power conversion (discharging operation).

[0033] Furthermore, after charging and discharging are stopped because charging and discharging power exceeds a predetermined operating range, or when charging and discharging is not being performed, the control circuit 31 acquires sensor values ​​from the current sensors 321, 331 and voltage sensors 323, 333 when charging and discharging power (charging and discharging power) is not being supplied to the power supply lines L and N. Furthermore, when the sensor value when charging and discharging power is not being supplied to the power supply lines L and N is different from the offset voltage, the control circuit 31 detects an abnormality in the corresponding sensor. The detection of a sensor abnormality will be described later.

[0034] The control circuit 31 has, for example, at least one processor (not shown) and at least one memory (not shown), and has a hardware configuration using a normal computer. For example, a DSP (Digital Signal Processor) can be used as the control circuit 31. The control circuit 31 may implement each function of the control circuit 31 by, for example, having a processor load a program stored in a ROM (Read Only Memory) or the like into a RAM (Random Access Memory) and executing the loaded program, or may implement some or all of the functions using dedicated hardware circuits (such as semiconductor integrated circuits).

[0035] The control circuit 31 that controls the operation of the power factor correction circuit 32 and the DCDC conversion circuit 33 and the control circuit 31 that detects sensor abnormalities may be realized by the same circuit, or may be realized by different independent circuits.

[0036] The control circuit 31 may be realized by a computer such as an ECU (Electronic Control Unit) provided inside the vehicle 2, a DCU (Domain Control Unit) such as a CDC (Cockpit Domain Controller) integrating multiple ECUs, or an OBU (On Board Unit). The control circuit 31 may also transmit and receive information to and from other ECUs mounted on the vehicle 2, and the load 8 and power supply device 9 connected to the vehicle 2, via an in-vehicle network including a CAN (Controller Area Network), Ethernet (registered trademark), or USB (Universal Serial Bus (registered trademark)) within the vehicle, or may communicate with an information processing device outside the vehicle 2 via a network such as the Internet.

[0037] The power factor correction circuit 32 is electrically connected between an AC socket or an in-vehicle socket (not shown) of the vehicle 2 and the DCDC conversion circuit 33 via a plurality of power supply lines L and N. For example, when the battery 7 is being charged, the power factor correction circuit 32 rectifies and smoothes the AC voltage from the power supply device 9 to generate a DC voltage. For example, when the battery 7 is being discharged, the power factor correction circuit 32 uses the DC voltage from the DCDC conversion circuit 33 to generate an AC voltage.

[0038] The DCDC conversion circuit 33 is electrically connected between the power factor correction circuit 32 and the battery 7 via a plurality of power supply lines L and N. For example, when charging the battery 7, the DCDC conversion circuit 33 converts the DC voltage generated by the power factor correction circuit 32 back into an AC voltage, and then rectifies and smooths the converted AC voltage, thereby generating a DC voltage of an arbitrary set voltage. For example, when discharging the battery 7, the DCDC conversion circuit 33 converts the DC voltage from the battery 7 into an AC voltage, and then rectifies and smooths the converted AC voltage, thereby generating a DC voltage of an arbitrary set voltage.

[0039] The on-board charger 3 may further include a noise filter (not shown) that suppresses (removes) noise from entering from the power supply device 9 and noise from leaking to the power supply device 9. This noise filter is provided, for example, between the AC socket or in-vehicle socket (not shown) of the vehicle 2 and the power factor correction circuit 32, but may also be provided in other locations.

[0040] Here, the power factor correction circuit 32 and the DC-DC conversion circuit 33 according to the embodiment are examples of power conversion circuits. Note that the power conversion circuit that converts AC power supplied from the power supply device 9 to the multiple power supply lines L and N into DC power when charging the battery 7, and the power conversion circuit that converts DC power supplied from the battery 7 to the multiple power supply lines L and N into AC power when discharging to the load 8 or the power supply device 9 may have a common circuit configuration, or may have a partially or entirely different circuit configuration.

[0041] 1, the power factor correction circuit 32 and the DC-DC conversion circuit 33 may each have at least one sensor. Fig. 1 illustrates a current sensor 321 and a voltage sensor 323 as examples of sensors provided in the power factor correction circuit 32. Fig. 1 also illustrates a current sensor 331 and a voltage sensor 333 as examples of sensors provided in the DC-DC conversion circuit 33.

[0042] The current sensors 321 and 331 and the voltage sensors 323 and 333 may be sensors provided in the on-board charger 3 as external components of the power factor correction circuit 32 and the DC-DC conversion circuit 33.

[0043] Furthermore, the current sensors 321, 331 and the voltage sensors 323, 333 are provided on at least one of the battery 7 side and the load 8 or power supply device 9 side with respect to the power factor correction circuit 32 and the DC-DC conversion circuit 33. That is, the current sensor 331 and the voltage sensor 333 do not have to be provided on the battery 7 side of the on-board charger 3. Alternatively, the current sensor 321 and the voltage sensor 323 do not have to be provided on the load 8 or power supply device 9 side of the on-board charger 3. Alternatively, a current sensor may be provided on at least one of the battery 7 side and the load 8 or power supply device 9 side, and a voltage sensor may be provided on the other side.

[0044] Here, the current sensors 321, 331 and the voltage sensors 323, 333 are each an example of a sensor electrically connected to the power supply lines L, N. Furthermore, the current sensors 321, 331 and the voltage sensors 323, 333 are each an example of a sensor whose output is offset so that a sensor value of an applied offset voltage is output when no charging / discharging power is supplied to the power supply lines L, N. Furthermore, the current sensors 321, 331 and the voltage sensors 323, 333 are each an example of a sensor configured to output a sensor value corresponding to the current or voltage of the charging / discharging power supplied to the power supply lines L, N.

[0045] (Current sensor) Fig. 2 is a diagram showing an example of the configuration of a sensor 4a that realizes the current sensors 321 and 331 in Fig. 1. As shown in Fig. 2, the sensor 4a is a current sensor configured to be able to detect the current value of a current flowing through the power supply line L using a shunt resistor Rs and an amplifier 51 (differential amplifier). Note that the sensor 4a may also be a current sensor configured to be able to detect the current value using a Hall sensor.

[0046] In the example of FIG. 2, the sensor 4a includes a shunt resistor Rs, a first resistor R1a, a second resistor R2a, a third resistor R1b, a fourth resistor R2b, an amplifier 51, and an offset voltage source 53. Here, the shunt resistor Rs is a resistive element with a resistance value Rs. The first resistor R1a and the third resistor R1b are resistive elements with a first resistance value R1. The second resistor R2a and the fourth resistor R2b are resistors with a second resistance value R2. The offset voltage source 53 is a voltage source that generates an offset voltage Voffset.

[0047] The shunt resistor Rs is electrically connected in series to the power supply line L. The shunt resistor Rs is also electrically connected in parallel to a pair of input terminals of an amplifier 51. Specifically, one of the pair of input terminals of the amplifier 51 is electrically connected to one end of the shunt resistor Rs via a first resistor R1a. One of the pair of input terminals of the amplifier 51 is electrically connected to an output terminal of the amplifier 51 via a second resistor R2a. Similarly, the other of the pair of input terminals of the amplifier 51 is electrically connected to the other end of the shunt resistor Rs via a third resistor R1b. The other of the pair of input terminals of the amplifier 51 is electrically connected to one end of an offset voltage source 53 via a fourth resistor R2b. The other end of the offset voltage source 53 is electrically connected to a ground line at ground potential. The output terminal of the amplifier 51 is also electrically connected to the control circuit 31. Furthermore, a pair of power supply terminals of the amplifier 51 are electrically connected between the wiring for the high-side power supply voltage VCC of the sensor 4a and the ground wire for the ground potential (the wiring for the low-side power supply voltage VEE). That is, the power supply voltage VCC of the sensor 4a provides the high-side power supply potential of the amplifier 51. Similarly, the ground wire for the ground potential provides the low-side power supply potential of the amplifier 51.

[0048] Fig. 3 is a diagram for explaining detection of a sensor abnormality based on the operating range of a sensor 4a that realizes the current sensors 321 and 331 in Fig. 1. In the example of Fig. 3, the power supply potentials on the high and low sides of the amplifier 51 are 3.3 [V] and 0 [V], respectively. The offset voltage Voffset is 1.65 [V].

[0049] The sensor 4a is configured to output, as a sensor value, a voltage value Vo corresponding to the current value I of the current (charge / discharge current) of the charge / discharge power supplied to the power supply line L, as shown in the following equation. In addition, the sensor 4a has an offset voltage Voffset applied to one of a pair of input terminals of the amplifier 51. Therefore, when no charge / discharge current is supplied to the power supply line L, the output of the sensor 4a is offset so that the voltage value Vo of the offset voltage Voffset is output as the sensor value.

[0050]

number

[0051] For example, when a current of 27.5 A or more flows through the power supply line L, the voltage value Vo (sensor value) from the sensor 4a is 3.3 V, which is the power supply potential on the high side of the amplifier 51. For example, when a current at the upper limit (max operating range) of the operating range of the charge / discharge current of the on-board charger 3 flows through the power supply line L, the voltage value Vo (sensor value) from the sensor 4a is a first voltage value VR1 V. The first voltage value VR1 V corresponding to the charge / discharge current at the max operating range is smaller than the power supply voltage VCC on the high side of the sensor 4a and larger than the offset voltage Voffset. In the present disclosure, the first voltage value corresponding to the charge / discharge current at the max operating range is an example of the max detection range.

[0052] For example, when no charge / discharge current flows through the power supply line L (I=0 [A]), the voltage value Vo (sensor value) from the sensor 4a is 1.65 [V], which is the offset voltage Voffset.

[0053] For example, when a current at the lower limit (operating range min) of the operating range of the charge / discharge current of the on-board charger 3 flows through the power supply line L, the voltage value Vo (sensor value) from the sensor 4a is the second voltage value VR2 [V]. The second voltage value VR2 [V] corresponding to the charge / discharge current at the operating range min is greater than the low-side power supply voltage VEE (e.g., ground potential 0 [V]) and less than the offset voltage Voffset. In the present disclosure, the second voltage value corresponding to the charge / discharge current at the operating range min is an example of the detection range min.

[0054] For example, when a current of −27.5 A or less flows through the power supply line L, the voltage value Vo (sensor value) from the sensor 4a is 0 V, which is the low-side power supply potential VEE of the amplifier 51.

[0055] When no charge / discharge power is supplied to the power supply lines L and N, i.e., when no charge / discharge current flows through the power supply line L (I=0[A]), a voltage value of Vo=1.65[V] is output as the sensor value, as shown in equation (1). In this situation, if a sensor abnormality occurs and the voltage value Vo output as the sensor value is shorted to the ground potential (power supply voltage VEE) or power supply voltage VCC, the charge / discharge current indicated by the sensor value will be below the minimum operating range or above the maximum operating range, even when I=0[A]. In other words, even when I=0[A], the sensor value will be below the minimum detection range or above the maximum detection range.

[0056] For this reason, the control circuit 31 detects a power fault (sensor abnormality) of the sensor 4a when the sensor value in a state where no charge / discharge current flows through the power supply line L is equal to or greater than a first voltage value VR1 (detection range max), such as the power supply potential (power supply voltage VCC) on the high side of the amplifier 51. Similarly, the control circuit 31 detects a ground fault (sensor abnormality) of the sensor 4a when the sensor value in a state where no charge / discharge current flows through the power supply line L is equal to or less than a second voltage value VR2 (detection range min), such as the power supply potential (ground potential) on the low side of the amplifier 51.

[0057] In this way, the control circuit 31 can detect a sensor abnormality such as a short to power or a short to ground of the sensor 4a that realizes the current sensors 321, 331, based on the operating range of the charge / discharge current of the on-board charger 3. Furthermore, the control circuit 31 can determine whether the output of the power supply voltage on the high side or the low side is due to a sensor abnormality such as a short to power or a short to ground, or is a measurement value corresponding to the current value, for each of the bidirectional current directions that are made to accommodate both charging and discharging.

[0058] (Regarding voltage sensors) Here, differences from the sensor 4a in FIG. 2 will be mainly described, and overlapping descriptions will be omitted as appropriate.

[0059] FIG. 4 is a diagram showing an example of the configuration of a sensor 4b that realizes the voltage sensors 323 and 333 in FIG. 1. The sensor 4b is a voltage sensor configured to be able to detect the voltage value of a voltage applied between a plurality of power supply lines L and N using an amplifier 51. As shown in FIG. 4, the sensor 4b has the same configuration as the sensor 4a in FIG. 2, except that the shunt resistor Rs is not provided. The sensor 4b may be configured as a voltage follower circuit. The resistance values ​​and offset voltage values ​​of the sensor 4b may be the same as or different from the resistance values ​​and offset voltage values ​​of the sensor 4a.

[0060] In the example of FIG. 4, the sensor 4b includes a first resistor R1a, a second resistor R2a, a third resistor R1b, a fourth resistor R2b, an amplifier 51, and an offset voltage source 53. One of a pair of input terminals of the amplifier 51 is electrically connected to a power supply line L via a first resistor R1a. One of the pair of input terminals of the amplifier 51 is electrically connected to an output terminal of the amplifier 51 via a second resistor R2a. Similarly, the other of the pair of input terminals of the amplifier 51 is electrically connected to a power supply line N via a third resistor R1b. The other of the pair of input terminals of the amplifier 51 is electrically connected to one end of the offset voltage source 53 via a fourth resistor R2b.

[0061] Fig. 5 is a diagram for explaining detection of a sensor abnormality based on the operating range of sensor 4b that realizes voltage sensors 323 and 333 in Fig. 1. In the example of Fig. 5, the power supply potentials on the high and low sides of amplifier 51 and the offset voltage Voffset are the same as those in the example of Fig. 2, but may be different.

[0062] The sensor 4b is configured to output, as a sensor value, a voltage value Vo corresponding to the voltage value (VL-VN) of the voltage of the charge / discharge power (charge / discharge voltage) supplied to the multiple power supply lines L and N, as shown in the following equation. In addition, the sensor 4b has an offset voltage Voffset applied to one of a pair of input terminals of the amplifier 51. Therefore, when no charge / discharge voltage is applied between the multiple power supply lines L and N, the output of the sensor 4b is offset so that the sensor value is the voltage value Vo of the offset voltage Voffset.

[0063]

number

[0064] For example, when a voltage of 430 V or more is applied between the multiple power supply lines L and N, the voltage value Vo (sensor value) from the sensor 4b is 3.3 V, which is the power supply potential on the high side of the amplifier 51. For example, when a voltage at the upper limit (operating range max) of the operating range of the charge / discharge voltage of the on-board charger 3 is applied between the multiple power supply lines L and N, the voltage value Vo (sensor value) from the sensor 4b is a third voltage value VR3 V. The third voltage value VR3 V corresponding to the charge / discharge voltage at the operating range max is smaller than the power supply voltage VCC on the high side of the sensor 4b and larger than the offset voltage Voffset. In the present disclosure, the third voltage value corresponding to the charge / discharge voltage at the operating range max is an example of the detection range max.

[0065] For example, when no charge / discharge voltage is applied between the plurality of power supply lines L and N, the voltage value Vo (sensor value) from the sensor 4b is 1.65 [V], which is the offset voltage Voffset.

[0066] For example, when a voltage at the lower limit (operating range min) of the operating range of the charge / discharge voltage of the on-board charger 3 is applied between the multiple power supply lines L and N, the voltage value Vo (sensor value) from the sensor 4b is a fourth voltage value VR4 [V]. The fourth voltage value VR4 [V] corresponding to the charge / discharge current of this operating range min is greater than the low-side power supply voltage VEE (e.g., ground potential 0 [V]) and less than the offset voltage Voffset. In the present disclosure, the fourth voltage value corresponding to the charge / discharge voltage of the operating range min is an example of the detection range min.

[0067] For example, when a voltage of −430 V or less is applied between multiple power supply lines L and N, the voltage value Vo (sensor value) from the sensor 4b is 0 V, which is the low-side power supply potential VEE of the amplifier 51.

[0068] When no charge / discharge power is supplied to the power supply lines L and N, i.e., when no charge / discharge voltage is applied between the multiple power supply lines L and N, VL = VN = 0 [V], a voltage value of Vo = 1.65 [V] is output as the sensor value, as shown in equation (2). Under these circumstances, if a sensor abnormality occurs and the voltage value Vo output as the sensor value is short-circuited to the ground potential (power supply voltage VEE) or power supply voltage VCC, the charge / discharge current indicated by the sensor value will be below the minimum operating range or above the maximum operating range, even when VL = VN = 0 [V]. In other words, even when VL = VN = 0 [V], the sensor value will be below the minimum detection range or above the maximum detection range.

[0069] For this reason, the control circuit 31 detects a power fault (sensor abnormality) of the sensor 4b when the sensor value in a state where no charge / discharge voltage is applied between the multiple power supply lines L and N is equal to or greater than the third voltage value VR3 (detection range max), such as in the case of the power supply potential (power supply voltage VCC) on the high side of the amplifier 51. Similarly, the control circuit 31 detects a ground fault (sensor abnormality) of the sensor 4b when the sensor value in a state where no charge / discharge voltage is applied between the multiple power supply lines L and N is equal to or less than the fourth voltage value VR4 (detection range min), such as in the case of the power supply potential (ground potential) on the low side of the amplifier 51.

[0070] In this way, the control circuit 31 can detect a sensor abnormality such as a short circuit to the power or a short circuit to the ground of the sensor 4b that realizes the voltage sensors 323, 333 based on the operating range of the charge / discharge voltage of the on-board charger 3.

[0071] Next, an abnormality detection process executed in the charging system 1 configured as above will be described.

[0072] FIG. 6 is a flowchart showing an example of the flow of a process executed by the control circuit 31 of FIG. 1 to detect a power fault or a ground fault (sensor fault) of the sensor 4a that implements the current sensors 321 and 331.

[0073] First, the control circuit 31 starts charging or discharging (charging / discharging) (S101). Then, the control circuit 31 acquires a sensor value from the sensor 4a and determines whether the charge / discharge current I indicated by the detected sensor value is within the operating range (S102). Here, whether the charge / discharge current I is within the operating range refers to whether the charge / discharge current I is equal to or greater than the operating range min and equal to or less than the operating range max. Note that this determination does not necessarily have to be made by converting the detected sensor value to the charge / discharge current I, but may be made by determining whether the sensor value is within the detection range, equal to or greater than the detection range max and equal to or less than the detection range min. Furthermore, for the sensor 4a realizing the current sensor 321, the charge / discharge current I is an alternating current (AC) current. Furthermore, for the sensor 4a realizing the current sensor 331, the charge / discharge current I is a direct current (DC). If the charge / discharge current is within the operating range (S102: Yes), the flow of FIG. 6 repeats the process of S102, for example, until charging / discharging is completed.

[0074] If the charge / discharge current I is not within the operating range (S102: No), the control circuit 31 stops the charge / discharge (S103). That is, the control circuit 31 stops the charge / discharge operation when the charge / discharge current I exceeds the operating range max or is less than the operating range min. Then, the control circuit 31 determines whether the charge / discharge current I indicated by the sensor value when no charge / discharge current I is flowing through the power supply line L is 0 "A", that is, whether the sensor value when no charge / discharge current I is flowing through the power supply line L is the offset voltage Voffset (S104).

[0075] If the detected charge / discharge current I is 0 "A," that is, if the sensor value of the charge / discharge current I is the offset voltage Voffset (S104: Yes), the control circuit 31 detects an overcurrent. The control circuit 31 may also detect a reduced current (low current) if the peak value of the charge / discharge current I indicated by the detected sensor value is small, for example, if the absolute value of the difference between the sensor value and the offset voltage Voffset is less than a predetermined threshold value. This predetermined threshold value is smaller than the absolute value of the detection range max or min, for example. The flow of FIG. 6 then ends, and is executed again when charging / discharging is resumed.

[0076] In this way, in the sensor abnormality detection process according to this embodiment, if the sensor value when no charge / discharge current I is flowing through the power supply line L is an offset voltage Voffset indicating that the charge / discharge current I is 0 "A", no sensor abnormality is detected.

[0077] On the other hand, if the detected charge / discharge current I is different from 0 "A," i.e., if the sensor value of the charge / discharge current I is different from the offset voltage Voffset (S104: No), the control circuit 31 determines that the sensor value of the charge / discharge current I is greater than the maximum detection range or less than the minimum detection range (S106). That is, the control circuit 31 determines that the detected charge / discharge current I is greater than the maximum operating range or less than the minimum operating range. In this case, the control circuit 31 determines that the sensor is abnormal (S107). Specifically, if the sensor value of the charge / discharge current I is greater than the maximum detection range, i.e., if the detected charge / discharge current I is greater than the maximum operating range, the control circuit 31 detects a sensor abnormality due to a power supply short (power short abnormality). If the sensor value of the charge / discharge current I is less than the minimum detection range, i.e., if the detected charge / discharge current I is less than the minimum operating range, the control circuit 31 detects a sensor abnormality due to a GND short (ground short abnormality). Then, the flow of FIG. 6 ends.

[0078] Thus, in the sensor abnormality detection process according to this embodiment, if the sensor value when no charge / discharge current I is flowing through the power supply line L is different from the offset voltage Voffset which indicates that the charge / discharge current I is 0 "A", it is detected as a power short or ground short abnormality (sensor abnormality).

[0079] FIG. 7 is a flowchart showing an example of the flow of a process executed by the control circuit of FIG. 1 to detect a power fault or a ground fault (sensor fault) in the sensor 4b that implements the voltage sensors 323 and 333.

[0080] First, the control circuit 31 starts supplying power to the multiple power supply lines L and N and starts charging or discharging (charging / discharging) (S201). Then, the control circuit 31 acquires a sensor value from the sensor 4b and determines whether the charging / discharging voltage is within the operating range (S202). Here, whether the charging / discharging voltage is within the operating range refers to whether the charging / discharging voltage is equal to or greater than the operating range min and equal to or less than the operating range max. Note that this determination does not necessarily have to be made by converting the detected sensor value to the charging / discharging voltage, but may be made by determining whether the sensor value is within the detection range, equal to or greater than the detection range max and equal to or less than the detection range min. Furthermore, for the sensor 4b that realizes the voltage sensor 323, the charging / discharging voltage is an alternating current (AC) voltage. Furthermore, for the sensor 4b that realizes the voltage sensor 333, the charging / discharging voltage is a direct current (DC) voltage. If the charging / discharging voltage is within the operating range (S202: Yes), the flow of FIG. 7 repeats the process of S202, for example, until charging / discharging is completed.

[0081] If the charge / discharge voltage is not within the operating range (S202: No), the control circuit 31 stops the supply of AC power or DC power to the multiple power supply lines L and N, and stops charging and discharging (S203). That is, the control circuit 31 stops the charge / discharge operation when the charge / discharge voltage exceeds the operating range max or is below the operating range min. Then, the control circuit 31 determines whether the charge / discharge voltage indicated by the sensor value when no charge / discharge voltage is applied between the multiple power supply lines L and N is 0 "V", that is, whether the sensor value when no charge / discharge voltage is applied between the multiple power supply lines L and N is the offset voltage Voffset (S204).

[0082] If the detected charge / discharge voltage is 0 "V," that is, if the sensor value of the charge / discharge voltage is the offset voltage Voffset (S204: Yes), the control circuit 31 detects an overvoltage. The control circuit 31 may also detect an undervoltage (low voltage) if the peak value of the charge / discharge voltage indicated by the detected sensor value is small, for example, if the absolute value of the difference between the sensor value and the offset voltage Voffset is less than a predetermined threshold value. This predetermined threshold value is smaller than the absolute value of the detection range max or min, for example. The flow of FIG. 7 then ends, and is executed again when charging / discharging is resumed.

[0083] In this way, in the sensor abnormality detection process according to this embodiment, if the sensor value when no charge / discharge voltage is applied between the multiple power supply lines L and N is the offset voltage Voffset, which indicates that the charge / discharge voltage is 0 "V", then no sensor abnormality is detected.

[0084] On the other hand, if the detected charge / discharge voltage is different from 0 "V," i.e., if the sensor value of the charge / discharge voltage is different from the offset voltage Voffset (S204: No), the control circuit 31 determines that the sensor value of the charge / discharge voltage is greater than the maximum detection range or less than the minimum detection range (S206). That is, the control circuit 31 determines that the detected charge / discharge voltage is greater than the maximum operating range or less than the minimum operating range. In this case, the control circuit 31 determines that the sensor is abnormal (S207). Specifically, if the sensor value of the charge / discharge voltage is greater than the maximum detection range, i.e., if the detected charge / discharge voltage is greater than the maximum operating range, the control circuit 31 detects a sensor abnormality due to a power supply short (power short abnormality). If the sensor value of the charge / discharge voltage is less than the minimum detection range, i.e., if the detected charge / discharge voltage is less than the minimum operating range, the control circuit 31 detects a sensor abnormality due to a GND short (ground short abnormality). Then, the flow in FIG. 7 ends.

[0085] Thus, in the sensor abnormality detection process according to this embodiment, if the sensor value when no charge / discharge voltage is applied between the multiple power supply lines L and N is different from the offset voltage Voffset which indicates that the charge / discharge voltage is 0 "V", it is detected as a power short or ground short abnormality (sensor abnormality).

[0086] 6 and 7 illustrate cases where the process is performed during charging / discharging, but this is not limiting. Detection of a sensor abnormality may be performed at the start or end of charging / discharging, or may be performed periodically during a period when no charging / discharging is occurring before the start or after the end of charging / discharging, or may be performed continuously or intermittently during charging / discharging. However, if detection of a sensor abnormality is performed during a period when no charging / discharging is occurring before the start or after the end of charging / discharging, including the start of charging / discharging, or during a period when no charging / discharging is occurring after the end or before the end of charging / discharging, the processes of S101 to S103 in FIG. 6 or the processes of S201 to S203 in FIG. 7 are not performed.

[0087] As described above, in the charging system 1 according to this embodiment, a predetermined offset voltage is set for the sensors 4a and 4b. The control circuit 31 acquires sensor values ​​from the sensors 4a and 4b when no charging or discharging power is supplied to the multiple power supply lines L and N. The control circuit 31 then determines whether a charging or discharging power abnormality, such as an overcurrent, an overvoltage, or an undervoltage, has been detected by the normal sensors 4a and 4b, or whether a sensor abnormality has occurred, based on whether the sensor values ​​from the sensors 4a and 4b when no charging or discharging power is supplied to the multiple power supply lines L and N differ from the offset voltage Voffset. Specifically, in the charging system 1 according to this embodiment, the control circuit 31 detects a sensor abnormality when the sensor values ​​from the sensors 4a and 4b when no charging or discharging power is supplied to the multiple power supply lines L and N differ from the offset voltage Voffset.

[0088] Conventionally, in an on-board charger 3, if the monitored sensor values ​​become inaccurate, causing an overcurrent in which the input / output current value exceeds the requested current, or an overvoltage in which the input / output voltage value exceeds the upper limit, there is a risk of damaging the power supply device 9 connected to the input side and the battery 7 and on-board components connected to the output side. Also, if the monitored sensor values ​​become inaccurate, causing an undervoltage in which the input / output voltage value falls below the lower limit, there is a risk that the battery 7 cannot be charged or the load 8 will not operate. For this reason, in the on-board charger 3, it is necessary to constantly monitor that the current sensors 321, 331 and voltage sensors 323, 333 are operating normally.

[0089] However, adding a redundant sensor to monitor sensor abnormalities increases costs and the component mounting area. Therefore, there is a demand for technology to detect sensor abnormalities without adding a redundant sensor. Furthermore, because the current direction is bidirectional to accommodate both charging and discharging, even if the sensor value is 0 V when no charging or discharging power is supplied to multiple power lines L and N (I = 0 A, VL = VN = 0 V), it is difficult to determine whether a sensor abnormality has occurred or a power abnormality has been detected by a normal sensor.

[0090] In this situation, in the charging system 1 according to the present embodiment, the control circuit 31 can determine that the sensors 4a and 4b have a power / ground fault abnormality when the charge / discharge voltage or charge / discharge current based on the sensor values ​​from the sensors 4a and 4b, to which a predetermined offset voltage is set, is not zero even when no charging or discharging is occurring, such as after the charging or discharging operation has stopped. Therefore, the charging system 1 according to the present embodiment can detect (monitor) a sensor abnormality without adding a redundant sensor. Furthermore, when the charge / discharge voltage or charge / discharge current based on the sensor values ​​is not zero even when no charging or discharging is occurring, it can determine whether a sensor abnormality has occurred or whether a power abnormality has been detected by a normal sensor.

[0091] (Second embodiment) In the above embodiment, the charging system 1 is described as being capable of detecting a power short / ground fault as a sensor abnormality based on the sensor value when no charging or discharging is being performed and the operating range of the charging and discharging power, but this is not limiting.Sensor abnormalities are not limited to power supply shorts or GND shorts, but may also include gain errors in which an abnormality occurs in the gain, causing the sensor value to become inaccurate.

[0092] Therefore, in this embodiment, a charging system 1 that can also detect a gain error as a sensor abnormality will be described. Note that in this embodiment, differences from the first embodiment will be mainly described, and overlapping descriptions will be omitted as appropriate.

[0093] FIG. 8 is a diagram showing an example of the configuration of a sensor 4c that realizes the current sensors 321 and 331 in FIG. 1 or a sensor 4d that realizes the voltage sensors 323 and 333 in FIG.

[0094] In the example of FIG. 8, sensor 4c is identical to sensor 4a of FIG. 2 except that the first resistor R1a having the first resistance value R1, the second resistor R2a having the second resistance value R2, the third resistor R1b having the first resistance value R1, and the fourth resistor R2b having the second resistance value R2 are represented as the first resistor R1 having the first resistance value R1, the second resistor R2 having the second resistance value R2, the third resistor R3 having the first resistance value R1, and the fourth resistor R4 having the second resistance value R2, respectively. Sensor 4d has the same configuration as sensor 4c except that it does not include shunt resistor Rs. The resistance values ​​and offset voltage values ​​of sensor 4d may be the same as or different from the resistance values ​​and offset voltage values ​​of sensor 4c.

[0095] The sensor 4c is configured to output, as a sensor value, a voltage value Vo corresponding to the shunt resistor voltage (V1-V2) generated across the shunt resistor Rs by the current value I of the current (charge / discharge current) of the charge / discharge power supplied to the power supply line L, as shown in the following equation. Furthermore, in the sensor 4c, an offset voltage Voffset is applied to one of a pair of input terminals of the amplifier 51. The resistance values ​​of the first to fourth resistors R1 to R4 are designed such that R1=R2 and R3=R4. Therefore, when charging / discharging is stopped and I=0 [A] or V1=V2=0 [V], the output of the sensor 4c is offset so that the voltage value Vo of the offset voltage Voffset is output as the sensor value.

[0096]

number

[0097] On the other hand, if a power fault occurs in which the sensor value is shorted to the high-side power supply voltage VCC or a ground fault occurs in which the sensor value is shorted to the low-side power supply voltage VEE (ground potential), the voltage value Vo becomes the high-side or low-side power supply voltage. Therefore, the control circuit 31 according to this embodiment can detect a power fault or a ground fault as a sensor fault, similar to the first embodiment.

[0098] Furthermore, if an abnormality occurs in the resistance values ​​of the first to fourth resistors R1 to R4, i.e., if a gain abnormality occurs, then R1=R2 or R3=R4 will no longer be true. As a result, the coefficient of the third term on the right side of equation (3) will not be 1, and the voltage value Vo will fall outside the predetermined variation range of the offset voltage Voffset. Here, the variation range of the offset voltage Voffset is an example of a predetermined range based on the offset voltage Voffset, and is predetermined based on, for example, individual differences in the resistance values ​​of the first to fourth resistors R1 to R4 and stored in the internal memory of the control circuit 31.

[0099] For this reason, when the sensor value in a state where no charge / discharge current flows through the power supply line L is outside the variation range of the offset voltage Voffset, the control circuit 31 detects a gain error (sensor abnormality) of the sensor 4c.

[0100] The sensor 4d can be explained by replacing V2 with VL (L-phase voltage) and V1 with VN (N-phase voltage). That is, the control circuit 31 detects a gain error (sensor abnormality) of the sensor 4d when the sensor value in a state where no charge / discharge voltage is applied between the multiple power supply lines L and N is outside the variation range of the offset voltage Voffset. The variation ranges may be the same for the sensors 4c and 4d, or may be different.

[0101] FIG. 9 is a flowchart showing an example of the flow of a process executed by the control circuit 31 of FIG. 1 to detect a gain error (sensor abnormality) in the sensor 4a that realizes the current sensors 321 and 331 or the sensor 4d that realizes the voltage sensors 323 and 333.

[0102] The flow in Fig. 9 is performed at the start or end of charging or discharging, or during a period when charging or discharging is not being performed before or after the start or end of charging or discharging. That is, the flow in Fig. 9 is started, for example, when the switch 61 of the on-board charger 3 or the switch 93 of the power supply device 9 is turned off. Note that the flow in Fig. 9 may be performed as a series of steps prior to the flow in Fig. 6 or Fig. 7, or may be performed independently at a different timing.

[0103] The control circuit 31 determines whether the voltage value Vo output as the sensor value is within the variation range (±α [%]) of the offset voltage Voffset (S301).

[0104] If the voltage value Vo is outside the variation range of the offset voltage Voffset (S301: No), the control circuit 31 detects a gain error as a sensor abnormality (S302), and then the flow of FIG. 9 ends.

[0105] On the other hand, if the voltage value Vo is within the variation range of the offset voltage Voffset (S301: Yes), the control circuit 31 determines that the gain is normal (S303), and then the flow in FIG. 9 ends.

[0106] In this way, the charging system 1 according to this embodiment monitors whether the sensor value before charging starts or not when charge / discharge power is not being supplied to the multiple power supply lines L and N is within the variation range of the offset voltage Voffset. If the sensor value before charging starts or not when charge / discharge power is not being supplied to the multiple power supply lines L and N is outside the variation range of the offset voltage Voffset, the charging system 1 according to this embodiment detects a gain error (sensor abnormality). With this configuration, it is possible to detect whether or not a sensor abnormality has occurred and its type based on the sensor value when charge / discharge is stopped, without using a redundant sensor.

[0107] In the explanations of each of the above embodiments, the numerical values ​​of the offset voltage Voffset of the sensor 4, the power supply voltages VCC and VEE, and the ranges of current and voltage corresponding to the voltage value Vo (sensor value) are merely examples and can be set as appropriate.

[0108] In each of the above-mentioned embodiments, the determination of "whether it is A or not" may be realized by determining only that it is A, or by determining only that it is not A, or by determining both of these.

[0109] In each of the above-described embodiments, "any of A" means "at least one of A."

[0110] In addition, the programs executed by each device of the charging system 1 according to each of the above-described embodiments may be provided by being recorded in an installable or executable format on a computer-readable recording medium (Computer Program Product) such as a CD-ROM, FD, CD-R, or DVD.

[0111] The programs executed by the devices of the charging system 1 according to the above-described embodiments may be stored on a computer connected to a network such as the Internet and provided by being downloaded via the network. The programs executed by the devices of the charging system 1 according to the above-described embodiments may be provided or distributed via a network such as the Internet.

[0112] Furthermore, the programs executed by the devices of the charging system 1 according to the above-described embodiments may be provided by being pre-installed in a ROM or the like.

[0113] According to at least one of the embodiments described above, a sensor abnormality can be detected without adding a redundant sensor.

[0114] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, as well as within the scope of the invention described in the claims and their equivalents.

[0115] (Addendum) The above description of the embodiments discloses the following techniques. (1) a sensor electrically connected to a power supply line through which power is supplied in both directions, that is, from an external power supply when an on-board battery is being charged and from the on-board battery when it is being discharged to an external load, the sensor being configured to offset its output so that a sensor value of an applied offset voltage is output when no charging or discharging power is being supplied to the power supply line, and to output the sensor value corresponding to the current or voltage of the charging or discharging power supplied to the power supply line; a control circuit that detects an abnormality in the sensor when the sensor value in a state in which the charging / discharging power is not supplied to the power supply line is different from the offset voltage. Anomaly detection device. (2) the sensor includes a current sensor configured to output, as the sensor value, a voltage value corresponding to a current value of a charge / discharge current flowing through the power supply line; the sensor value corresponding to the upper limit of the operating range of the charging / discharging current is a first voltage value that is smaller than a high-side power supply voltage of the current sensor and larger than the offset voltage; the sensor value corresponding to the lower limit of the operating range of the charging / discharging current is a second voltage value that is greater than a low-side power supply voltage of the current sensor and less than the offset voltage; the control circuit detects a power fault of the current sensor when the sensor value is equal to or greater than the first voltage value in a state where the charging / discharging power is not supplied to the power supply line, and detects a ground fault of the current sensor when the sensor value is equal to or less than the second voltage value. The abnormality detection device according to (1) above. (3) the sensor includes a current sensor configured to output, as the sensor value, a voltage value corresponding to a current value of a charge / discharge current flowing through the power supply line; The current sensor a shunt resistor electrically connected in series to the power supply line; an offset voltage source that generates the offset voltage; an amplifier having an output terminal electrically connected to the control circuit, one of a pair of input terminals electrically connected to one end of the shunt resistor via a first resistor having a first resistance value and electrically connected to the output terminal via a second resistor having a second resistance value, the other of the pair of input terminals electrically connected to the other end of the shunt resistor via a third resistor having the first resistance value and electrically connected to the offset voltage source via a fourth resistor having the second resistance value, and a pair of power supply terminals electrically connected between power supply voltages on a high side and a low side of the sensor, The abnormality detection device according to (1) or (2) above. (4) the control circuit detects a gain error of the current sensor when the sensor value from the output terminal in a state in which the charging / discharging power is not supplied to the power supply line is outside a predetermined range based on the offset voltage. The abnormality detection device according to (2) or (3) above. (5) the sensor includes a voltage sensor configured to output, as the sensor value, a voltage value corresponding to a charge / discharge voltage applied between a voltage conductor and a neutral conductor included in the power supply line; the sensor value corresponding to the upper limit of the operating range of the charge / discharge voltage is a third voltage value that is lower than a high-side power supply voltage of the voltage sensor and higher than the offset voltage; the sensor value corresponding to the lower limit of the operating range of the charge / discharge voltage is a fourth voltage value that is greater than a low-side power supply voltage of the voltage sensor and less than the offset voltage; the control circuit detects a power fault of the voltage sensor when the sensor value is equal to or higher than the third voltage value in a state where the charging / discharging power is not supplied to the power supply line, and detects a ground fault of the voltage sensor when the sensor value is equal to or lower than the fourth voltage value. The abnormality detection device according to any one of (1) to (4) above. (6) the sensor includes a voltage sensor configured to output, as the sensor value, a voltage value corresponding to a charge / discharge voltage applied between a voltage conductor and a neutral conductor included in the power supply line; The voltage sensor an offset voltage source that generates the offset voltage; an amplifier having an output terminal electrically connected to the control circuit, one of a pair of input terminals electrically connected to the voltage line via a first resistor having a first resistance value and electrically connected to the output terminal via a second resistor having a second resistance value, the other of the pair of input terminals electrically connected to the neutral line via a third resistor having the first resistance value and electrically connected to the offset voltage source via a fourth resistor having the second resistance value, and a pair of power supply terminals electrically connected between power supply voltages on the high side and the low side of the sensor, The abnormality detection device according to any one of (1) to (5) above. (7) the control circuit detects a gain error of the voltage sensor when the sensor value from the output terminal in a state in which the charging / discharging power is not supplied to the power supply line is outside a predetermined range based on the offset voltage. The abnormality detection device according to (5) or (6) above. (8) An abnormality detection device according to any one of (1) to (7) above; a power conversion circuit that converts AC power supplied from the external power supply to the power supply line into DC power when the in-vehicle battery is being charged, the sensor is provided on at least one of the external power supply side and the vehicle battery side in the power conversion circuit; On-board charger. (9) An abnormality detection device according to any one of (1) to (7) above; a power conversion circuit that converts AC power supplied from the external power supply to the power supply line into DC power when the in-vehicle battery is being charged, When the charging power exceeds a predetermined operating range, the control circuit outputs a control signal to the external power supply to stop the supply of the AC power to the power conversion circuit, and detects an abnormality of the sensor based on the sensor value in a state where the charging power is not supplied to the power supply line. On-board charger. (10) An abnormality detection device according to any one of (1) to (7) above; a power conversion circuit that converts DC power supplied from the vehicle battery to the power supply line into AC power when discharging to the external load, the sensor is provided on at least one of the external power supply side and the vehicle battery side in the power conversion circuit; On-board charger. (11) An abnormality detection device according to any one of (1) to (7) above; a power conversion circuit that converts DC power supplied from the vehicle battery to the power supply line into AC power when discharging to the external load, the control circuit stops operation of the power conversion circuit when the discharge power exceeds a predetermined operating range, and detects an abnormality in the sensor based on the sensor value in a state where the discharge power is not supplied to the power supply line. On-board charger. (12) a control circuit for an abnormality detection device including a sensor electrically connected to a power supply line through which power from an external power supply when an on-board battery is charged and power from the on-board battery when discharging to an external load are supplied in both directions, the output of which is offset so that a sensor value of an applied offset voltage is output when no charging / discharging power is supplied to the power supply line, and the control circuit for an abnormality detection device including a sensor configured to output the sensor value corresponding to the current or voltage of the charging / discharging power supplied to the power supply line; an abnormality of the sensor is detected when the sensor value in a state where the charging / discharging power is not supplied to the power supply line is different from the offset voltage; Anomaly detection methods. (13) the sensor includes a current sensor configured to output, as the sensor value, a voltage value corresponding to a current value of a charge / discharge current flowing through the power supply line; the sensor value corresponding to the upper limit of the operating range of the charging / discharging current is a first voltage value that is smaller than a high-side power supply voltage of the current sensor and larger than the offset voltage; the sensor value corresponding to the lower limit of the operating range of the charging / discharging current is a second voltage value that is greater than a low-side power supply voltage of the current sensor and less than the offset voltage; With respect to the sensor value in a state in which the charging / discharging power is not supplied to the power supply line, if the sensor value is equal to or higher than the first voltage value, a power fault of the current sensor is detected, and if the sensor value is equal to or lower than the second voltage value, a ground fault of the current sensor is detected. The anomaly detection method according to (12) above. (14) the sensor includes a current sensor configured to output, as the sensor value, a voltage value corresponding to a current value of a charge / discharge current flowing through the power supply line; The current sensor a shunt resistor electrically connected in series to the power supply line; an offset voltage source that generates the offset voltage; an amplifier having an output terminal electrically connected to the control circuit, one of a pair of input terminals electrically connected to one end of the shunt resistor via a first resistor having a first resistance value and electrically connected to the output terminal via a second resistor having a second resistance value, the other of the pair of input terminals electrically connected to the other end of the shunt resistor via a third resistor having the first resistance value and electrically connected to the offset voltage source via a fourth resistor having the second resistance value, and a pair of power supply terminals electrically connected between power supply voltages on a high side and a low side of the sensor, The abnormality detection method according to (12) or (13) above. (15) a gain error of the current sensor is detected when the sensor value from the output terminal in a state where the charging / discharging power is not supplied to the power supply line is outside a predetermined range based on the offset voltage; The abnormality detection method according to (13) or (14) above. (16) the sensor includes a voltage sensor configured to output, as the sensor value, a voltage value corresponding to a charge / discharge voltage applied between a voltage conductor and a neutral conductor included in the power supply line; the sensor value corresponding to the upper limit of the operating range of the charge / discharge voltage is a third voltage value that is lower than a high-side power supply voltage of the voltage sensor and higher than the offset voltage; the sensor value corresponding to the lower limit of the operating range of the charge / discharge voltage is a fourth voltage value that is greater than a low-side power supply voltage of the voltage sensor and less than the offset voltage; With respect to the sensor value in a state in which the charging / discharging power is not supplied to the power supply line, if the sensor value is equal to or higher than the third voltage value, a power fault of the voltage sensor is detected, and if the sensor value is equal to or lower than the fourth voltage value, a ground fault of the voltage sensor is detected. The abnormality detection method according to any one of (12) to (15) above. (17) the sensor includes a voltage sensor configured to output, as the sensor value, a voltage value corresponding to a charge / discharge voltage applied between a voltage conductor and a neutral conductor included in the power supply line; The voltage sensor an offset voltage source that generates the offset voltage; an amplifier having an output terminal electrically connected to the control circuit, one of a pair of input terminals electrically connected to the voltage line via a first resistor having a first resistance value and electrically connected to the output terminal via a second resistor having a second resistance value, the other of the pair of input terminals electrically connected to the neutral line via a third resistor having the first resistance value and electrically connected to the offset voltage source via a fourth resistor having the second resistance value, and a pair of power supply terminals electrically connected between power supply voltages on the high side and the low side of the sensor, The abnormality detection method according to any one of (12) to (16) above. (18) a gain error of the voltage sensor is detected when the sensor value from the output terminal in a state where the charging / discharging power is not supplied to the power supply line is outside a predetermined range based on the offset voltage; The abnormality detection method according to (16) or (17) above. (19) a method executed by the control circuit in an on-board charger including the abnormality detection device and a power conversion circuit that converts AC power supplied from the external power supply to the power supply line into DC power when charging the on-board battery, the method comprising: the sensor is provided on at least one of the external power supply side and the vehicle battery side in the power conversion circuit; The abnormality detection method according to any one of (12) to (18) above. (20) In an on-board charger including the abnormality detection device and a power conversion circuit that converts AC power supplied from the external power source to the power supply line into DC power when charging the on-board battery, When the charging power exceeds a predetermined operating range, a control signal is output to the external power supply to stop the supply of the AC power to the power conversion circuit, and an abnormality of the sensor is detected based on the sensor value in a state where the charging power is not supplied to the power supply line. The abnormality detection method according to any one of (12) to (19) above. (twenty one) a method executed by the control circuit in an on-board charger including the abnormality detection device and a power conversion circuit that converts DC power supplied from the on-board battery to the power supply line during discharge to the external load into AC power, the method comprising: the sensor is provided on at least one of the external power supply side and the vehicle battery side in the power conversion circuit; The abnormality detection method according to any one of (12) to (20) above. (twenty two) In an on-board charger including the abnormality detection device and a power conversion circuit that converts DC power supplied from the on-board battery to the power supply line during discharge to the external load into AC power, When the discharge power exceeds a predetermined operating range, the operation of the power conversion circuit is stopped, and an abnormality of the sensor is detected based on the sensor value in a state where the discharge power is not supplied to the power supply line. The abnormality detection method according to any one of (12) to (21) above. (twenty three) An on-board charger according to any one of (8) to (11) above; The vehicle battery. vehicle. (twenty four) A program for causing a computer to execute the anomaly detection method according to any one of (12) to (22) above. (twenty five) A storage medium (Computer Program Product) on which the program described in (24) above is recorded, the program being executed by a computer. [Explanation of symbols]

[0116] 1 Charging System 2 vehicles 3. On-board charger (fault detection device, power conversion device) 31 Control circuit 32 Power factor correction circuit (power conversion circuit) 321 Current sensor (sensor) 323 Voltage Sensor (Sensor) 33 DC-DC converter circuit (power conversion circuit) 331 Current sensor (sensor) 333 Voltage Sensor (Sensor) 61 Switch 7 Battery 8 Load (external load) 9 Power supply device (external power supply) 91 AC voltage source 93 Switch

Claims

1. a sensor electrically connected to a power supply line through which power is supplied in both directions, that is, from an external power supply when an on-board battery is being charged and from the on-board battery when it is being discharged to an external load, the sensor being configured to offset its output so that a sensor value of an applied offset voltage is output when no charging or discharging power is being supplied to the power supply line, and to output the sensor value corresponding to the current or voltage of the charging or discharging power supplied to the power supply line; a control circuit that detects an abnormality in the sensor when the sensor value in a state in which the charging / discharging power is not supplied to the power supply line is different from the offset voltage. Anomaly detection device.

2. the sensor includes a current sensor configured to output, as the sensor value, a voltage value corresponding to a current value of a charge / discharge current flowing through the power supply line; the sensor value corresponding to the upper limit of an operating range for the charging / discharging current is a first voltage value that is smaller than a high-side power supply voltage of the current sensor and larger than the offset voltage; the sensor value corresponding to the lower limit of the operating range of the charging / discharging current is a second voltage value that is greater than a low-side power supply voltage of the current sensor and less than the offset voltage; the control circuit detects a power fault of the current sensor when the sensor value is equal to or greater than the first voltage value in a state where the charging / discharging power is not supplied to the power supply line, and detects a ground fault of the current sensor when the sensor value is equal to or less than the second voltage value. The abnormality detection device according to claim 1 .

3. The current sensor a shunt resistor electrically connected in series to the power supply line; an offset voltage source that generates the offset voltage; an amplifier having an output terminal electrically connected to the control circuit, one of a pair of input terminals electrically connected to one end of the shunt resistor via a first resistor having a first resistance value and electrically connected to the output terminal via a second resistor having a second resistance value, the other of the pair of input terminals electrically connected to the other end of the shunt resistor via a third resistor having the first resistance value and electrically connected to the offset voltage source via a fourth resistor having the second resistance value, and a pair of power supply terminals electrically connected between power supply voltages on a high side and a low side of the sensor, The abnormality detection device according to claim 2 .

4. the control circuit detects a gain error of the current sensor when the sensor value from the output terminal in a state in which the charging / discharging power is not supplied to the power supply line is outside a predetermined range based on the offset voltage. The abnormality detection device according to claim 3 .

5. the sensor includes a voltage sensor configured to output, as the sensor value, a voltage value corresponding to a charge / discharge voltage applied between a voltage conductor and a neutral conductor included in the power supply line; the sensor value corresponding to the upper limit of the operating range of the charge / discharge voltage is a third voltage value that is lower than a high-side power supply voltage of the voltage sensor and higher than the offset voltage; the sensor value corresponding to the lower limit of the operating range of the charge / discharge voltage is a fourth voltage value that is greater than a low-side power supply voltage of the voltage sensor and less than the offset voltage; the control circuit detects a power fault of the voltage sensor when the sensor value is equal to or greater than the third voltage value in a state where the charging / discharging power is not supplied to the power supply line, and detects a ground fault of the voltage sensor when the sensor value is equal to or less than the fourth voltage value. The abnormality detection device according to claim 1 .

6. The voltage sensor an offset voltage source that generates the offset voltage; an amplifier having an output terminal electrically connected to the control circuit, one of a pair of input terminals electrically connected to the voltage line via a first resistor having a first resistance value and electrically connected to the output terminal via a second resistor having a second resistance value, the other of the pair of input terminals electrically connected to the neutral line via a third resistor having the first resistance value and electrically connected to the offset voltage source via a fourth resistor having the second resistance value, and a pair of power supply terminals electrically connected between power supply voltages on the high side and the low side of the sensor, The abnormality detection device according to claim 5 .

7. the control circuit detects a gain error of the voltage sensor when the sensor value from the output terminal in a state in which the charging / discharging power is not supplied to the power supply line is outside a predetermined range based on the offset voltage. The abnormality detection device according to claim 6.

8. The abnormality detection device according to any one of claims 1 to 7; a power conversion circuit that converts AC power supplied from the external power supply to the power supply line into DC power when the in-vehicle battery is being charged, the sensor is provided on at least one of the external power supply side and the vehicle battery side in the power conversion circuit; On-board charger.

9. The abnormality detection device according to any one of claims 1 to 7; a power conversion circuit that converts AC power supplied from the external power supply to the power supply line into DC power when the in-vehicle battery is being charged, When the charging power exceeds a predetermined operating range, the control circuit outputs a control signal to the external power supply to stop the supply of the AC power to the power conversion circuit, and detects an abnormality of the sensor based on the sensor value in a state where the charging power is not supplied to the power supply line. On-board charger.

10. The abnormality detection device according to any one of claims 1 to 7; a power conversion circuit that converts DC power supplied from the vehicle battery to the power supply line into AC power when discharging to the external load, the sensor is provided on at least one of the external power supply side and the vehicle battery side in the power conversion circuit; On-board charger.

11. The abnormality detection device according to any one of claims 1 to 7; a power conversion circuit that converts DC power supplied from the vehicle battery to the power supply line into AC power when discharging to the external load, the control circuit stops operation of the power conversion circuit when the discharge power exceeds a predetermined operating range, and detects an abnormality in the sensor based on the sensor value in a state where the discharge power is not supplied to the power supply line. On-board charger.

12. a control circuit for an abnormality detection device including a sensor electrically connected to a power supply line through which power from an external power supply when an on-board battery is charged and power from the on-board battery when discharging to an external load are supplied in both directions, the output of which is offset so that a sensor value of an applied offset voltage is output when no charging / discharging power is supplied to the power supply line, and the control circuit for an abnormality detection device including a sensor configured to output the sensor value corresponding to the current or voltage of the charging / discharging power supplied to the power supply line; an abnormality of the sensor is detected when the sensor value in a state where the charging / discharging power is not supplied to the power supply line is different from the offset voltage; Anomaly detection methods.

13. the sensor includes a current sensor configured to output, as the sensor value, a voltage value corresponding to a current value of a charge / discharge current flowing through the power supply line; the sensor value corresponding to the upper limit of an operating range for the charging / discharging current is a first voltage value that is smaller than a high-side power supply voltage of the current sensor and larger than the offset voltage; the sensor value corresponding to the lower limit of the operating range of the charging / discharging current is a second voltage value that is greater than a low-side power supply voltage of the current sensor and less than the offset voltage; With respect to the sensor value in a state in which the charging / discharging power is not supplied to the power supply line, if the sensor value is equal to or higher than the first voltage value, a power fault of the current sensor is detected, and if the sensor value is equal to or lower than the second voltage value, a ground fault of the current sensor is detected. The anomaly detection method according to claim 12.

14. The current sensor a shunt resistor electrically connected in series to the power supply line; an offset voltage source that generates the offset voltage; an amplifier having an output terminal electrically connected to the control circuit, one of a pair of input terminals electrically connected to one end of the shunt resistor via a first resistor having a first resistance value and electrically connected to the output terminal via a second resistor having a second resistance value, the other of the pair of input terminals electrically connected to the other end of the shunt resistor via a third resistor having the first resistance value and electrically connected to the offset voltage source via a fourth resistor having the second resistance value, and a pair of power supply terminals electrically connected between power supply voltages on a high side and a low side of the sensor, The anomaly detection method according to claim 13.

15. a gain error of the current sensor is detected when the sensor value from the output terminal in a state where the charging / discharging power is not supplied to the power supply line is outside a predetermined range based on the offset voltage; The anomaly detection method according to claim 14.

16. the sensor includes a voltage sensor configured to output, as the sensor value, a voltage value corresponding to a charge / discharge voltage applied between a voltage conductor and a neutral conductor included in the power supply line; the sensor value corresponding to the upper limit of the operating range of the charge / discharge voltage is a third voltage value that is lower than a high-side power supply voltage of the voltage sensor and higher than the offset voltage; the sensor value corresponding to the lower limit of the operating range of the charge / discharge voltage is a fourth voltage value that is greater than a low-side power supply voltage of the voltage sensor and less than the offset voltage; With respect to the sensor value in a state in which the charging / discharging power is not supplied to the power supply line, if the sensor value is equal to or higher than the third voltage value, a power fault of the voltage sensor is detected, and if the sensor value is equal to or lower than the fourth voltage value, a ground fault of the voltage sensor is detected. The anomaly detection method according to claim 12.

17. The voltage sensor an offset voltage source that generates the offset voltage; an amplifier having an output terminal electrically connected to the control circuit, one of a pair of input terminals electrically connected to the voltage line via a first resistor having a first resistance value and electrically connected to the output terminal via a second resistor having a second resistance value, the other of the pair of input terminals electrically connected to the neutral line via a third resistor having the first resistance value and electrically connected to the offset voltage source via a fourth resistor having the second resistance value, and a pair of power supply terminals electrically connected between power supply voltages on the high side and the low side of the sensor, The anomaly detection method according to claim 16.

18. a gain error of the voltage sensor is detected when the sensor value from the output terminal in a state where the charging / discharging power is not supplied to the power supply line is outside a predetermined range based on the offset voltage; The anomaly detection method of claim 17.

19. In an on-board charger including the abnormality detection device and a power conversion circuit that converts AC power supplied from the external power source to the power supply line into DC power when charging the on-board battery, When the charging power exceeds a predetermined operating range, a control signal is output to the external power supply to stop the supply of the AC power to the power conversion circuit, and an abnormality of the sensor is detected based on the sensor value in a state where the charging power is not supplied to the power supply line. The anomaly detection method according to any one of claims 12 to 18.

20. In an on-board charger including the abnormality detection device and a power conversion circuit that converts DC power supplied from the on-board battery to the power supply line during discharge to the external load into AC power, When the discharge power exceeds a predetermined operating range, the operation of the power conversion circuit is stopped, and an abnormality of the sensor is detected based on the sensor value in a state where the discharge power is not supplied to the power supply line. The anomaly detection method according to any one of claims 12 to 18.

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