Anomaly detection device, onboard charger and anomaly detection method

Abstract

An anomaly detection device according to the present disclosure comprises a sensor and a control circuit. The sensor is electrically connected to a power supply line, which bidirectionally supplies current from an external power supply when charging an onboard battery and current from the onboard battery to an external load when discharging. The sensor is configured to have an output offset such that a sensor value is output at an applied offset voltage in a state where the power supply is not supplied with charging / discharging energy, and the sensor value is output according to a current or voltage of the charging / discharging energy. The control circuit is configured to detect an anomaly of the sensor when the sensor value deviates from the offset voltage in a state where the power supply line is not supplied with the charging / discharging voltage.

Description

Technical field

[0001] The present disclosure relates to an anomaly detection device, an onboard charger and an anomaly detection method. Technical background

[0002] In an onboard charger, it is necessary to maintain constant input and output current values ​​by implementing constant current control. This ensures that the current values ​​correspond to the currents requested by the vehicle, while simultaneously monitoring the current sensor readings for both input and output currents. If an anomaly occurs in the current sensor under these circumstances, there is a risk of damage to a power supply connected to an input, an onboard battery connected to an output, and an onboard component. This could occur, for example, if the monitored sensor readings become inaccurate and the input and output current values ​​exceed the required currents. Therefore, the onboard charger must continuously monitor whether the current sensor is functioning correctly.

[0003] JP 2007-099033 A, for example, discloses a technique in which a current sensor that detects charging / discharging currents is present in each of several batteries and an anomaly of the current sensor is detected by comparing the detected values ​​of the current sensor.

[0004] However, in a design where an additional sensor is added as a redundant sensor to monitor for an anomaly, the problem arises that costs increase or the mounting area of ​​a component is enlarged by the addition. Therefore, there is a need for a technique to detect anomalies without requiring an additional sensor.

[0005] One of the problems that this disclosure aims to solve is the detection of a sensor anomaly without adding a redundant sensor. Summary

[0006] An anomaly detection device according to the present disclosure comprises a sensor and a control circuit. The sensor is electrically connected to a power supply line, which bidirectionally supplies current from an external power supply when charging an onboard battery and current from the onboard battery when discharging to an external load. The sensor is configured to have an output offset such that a sensor value is output at an applied offset voltage in a state where the power supply line is not supplied with charging / discharging energy, and the sensor value is output according to a current or voltage of the charging / discharging energy supplied to the power supply line. The control circuit is configured to detect an anomaly of the sensor when the sensor value deviates from the offset voltage in a state where the power supply line is not supplied with charging / discharging power.

[0007] According to the present disclosure, an anomaly of the sensor can be detected without the need for an additional sensor. Brief description of the drawings Fig. 1 is a diagram showing an example of the design of a charging system according to one embodiment; Fig. Figure 2 is a diagram that shows an example of the design of a current sensor. Fig. 1 shows; Fig. Figure 3 is a diagram describing the detection of a sensor anomaly based on an operating range that relates to the current sensor of Fig. 1 refers to; Fig. Figure 4 is a diagram that shows an example of the design of a voltage sensor. Fig. 1 shows; Fig. Figure 5 is a diagram describing the detection of a sensor anomaly based on an operating range relating to the voltage sensor of Fig. 1 refers to; Fig. Figure 6 is a flowchart showing an example of a processing sequence for detecting a power supply fault or a ground fault (sensor anomaly) of the current sensor, controlled by a control circuit. Fig. 1 is executed; Fig. Figure 7 is a flowchart that illustrates an example of a processing sequence for detecting a power supply fault or a ground fault (sensor anomaly) of the voltage sensor, which is controlled by the control circuit of Fig. 1 is executed; Fig. Figure 8 is a diagram that shows an example of the design of the current sensor and the voltage sensor in Fig. 1 shows; and Fig. Figure 9 is a flowchart showing an example of a processing sequence for detecting a gain error (sensor anomaly) of the current or voltage sensor, as determined by the control circuit of Fig. 1 is executed. Detailed description

[0008] The following describes embodiments of a self-diagnostic circuit, an anomaly detection device, a conversion circuit (on-board charger), a vehicle, a charging system, an anomaly detection method, a program and a recording medium according to the present disclosure with reference to the drawings.

[0009] In the description of this disclosure, components that have the same or substantially the same functions as those described above with reference to the previously described drawings are identified by the same reference numerals, and the description of these elements may be omitted accordingly. Even if the same or substantially the same part is involved, the dimensions and proportions may be represented differently in the drawings. To ensure the clarity of the drawings, only the principal components are identified by reference numerals in the description of each drawing, and even components that have the same or substantially the same functions as those described in the preceding drawings are not identified by reference numerals.

[0010] In the description of this disclosure, components that have the same or substantially the same function can be distinguished by adding alphanumeric characters to the end of the reference numerals. Alternatively, in a case where several components that have the same or substantially the same function cannot be distinguished, the components can be described jointly by omitting alphanumeric characters from the end of the reference numerals. (First embodiment)

[0011] Fig. Figure 1 is a diagram showing an example of the design of a charging system 1 according to one embodiment. As shown in Fig. As shown in Figure 1, the charging system 1 comprises a vehicle 2, a load 8, and a power supply 9. The vehicle 2 also has an onboard charger 3 and a battery 7.

[0012] In vehicle 2, the on-board charger 3 is electrically connected to battery 7 via several power supply lines L and N. A switch 61, for example, can be provided on the power supply line L between the on-board charger 3 and battery 7. Switch 61 operates, for example, based on a control signal from a control circuit 31 and switches between live and disconnected operation between the on-board charger 3 and battery 7. Switch 61 is not limited to operating according to the control signal from the control circuit 31, but can also operate according to a control signal from a control circuit located outside the on-board charger 3 in vehicle 2, such as any on-board electronic control unit (ECU). Alternatively, switch 61 can operate, for example, based on a control signal from the power supply 9 outside of vehicle 2.Furthermore, the control signals from outside the onboard charger 3 can be supplied directly to the switch 61, or the control circuit 31 can be caused to output the control signal to the switch 61. The switch 61 is not an essential component and is not strictly necessary.

[0013] The onboard charger 3 is designed to be electrically connected to both the load 8 and the power supply 9 connected to the vehicle 2. Specifically, the onboard charger 3 is electrically connected to an AC socket or a vehicle socket (not shown) of the vehicle 2 via the multiple power supply lines L and N. The load 8 or the power supply 9 is electrically connected to the AC socket of the vehicle 2 via a connecting cable, such as a charging cable.

[0014] In charging system 1, when vehicle 2 is charging, alternating current from the external power supply 9 is fed into the multiple power supply lines L and N. Simultaneously, when vehicle 2 is discharging, alternating current based on direct current (DC) from battery 7 is fed into the multiple power supply lines L and N. In other words, current from power supply 9 when charging battery 7 and current from battery 7 when discharging to load 8 or power supply 9 are supplied bidirectionally to the multiple power supply lines L and N.

[0015] The power supply lines L and N are supplied with single-phase alternating current. Power supply line L is a voltage line through which a single-phase current from a single-phase AC power supply flows. Power supply line N is, for example, a neutral line that is electrically connected to each of the single-phase AC power supplies and to earth potential.

[0016] For example, the multiple power supply lines L and N can be designed to deliver three-phase alternating current. In this case, the power supply line L comprises, for example, several power supply lines L1 to L3 (not shown). Power supply line L1 is, for example, a voltage line through which the single-phase current from the single-phase power supply or, for example, a U-phase current (first phase) from a three-phase power supply flows. Power supply line L2 is, for example, a voltage line that is not electrically connected to the single-phase power supply and through which, for example, a V-phase current (second phase) from the three-phase power supply flows.The power supply line L3, for example, is a voltage line that is not electrically connected to the single-phase power supply and through which, for example, a W-phase current (third phase) from the three-phase power supply flows. The power supply line N, for example, is a neutral line that is electrically connected to both the single-phase and three-phase AC power supplies, as well as a grounding conductor for earth potential. The grounding conductor for earth potential can, for example, be a ground wire that is functionally grounded to a metal chassis or similar component of vehicle 2.

[0017] The AC socket (not shown) of vehicle 2 is, for example, a socket for the power supply (inlet / outlet) for charging and discharging vehicle 2. The AC socket is located, for example, in a location accessible from the outside of vehicle 2. When charging vehicle 2, the AC socket is connected to power supply 9. When discharging vehicle 2, the AC socket is connected to consumer 8 or power supply 9. The AC socket of vehicle 2 supports, for example, both single-phase and three-phase AC power.

[0018] The onboard socket (not shown) of vehicle 2 is, for example, a socket for the power supply (socket) used to discharge vehicle 2. The onboard socket is located, for example, in a compartment (vehicle interior) of vehicle 2. The onboard socket is connected to consumer 8, for example, during discharge from vehicle 2. The onboard socket of vehicle 2 is designed for single-phase alternating current. However, the onboard socket of vehicle 2 can be designed for both single-phase and three-phase alternating current.

[0019] Vehicle 2 can be, for example, various electric vehicles (EVs) such as a battery electric vehicle (BEV), a hybrid electric vehicle (HEV), and a plug-in hybrid electric vehicle (PHEV). Furthermore, Vehicle 2 can be various vehicles designed to be powered by the energy of the built-in battery 7, such as a passenger car, a truck, a van, a motorcycle, and an electric scooter.

[0020] The technology according to the embodiment is not limited to the on-board charger 3 mounted on the vehicle 2 and can be applied to various power conversion devices, such as those found in an aircraft, a gaming device, an uninterruptible power supply, and the like.

[0021] Vehicle 2 can be designed to operate onboard devices (electrical components) by, for example, using power from battery 7. Examples of onboard devices include a navigation system, an audio system, an air conditioner, an electric window, a defroster, a control unit, a GPS module, an onboard camera, and similar items.

[0022] The on-board charger 3 is a power conversion device attached to the vehicle 2. The on-board charger 3 can be designed to operate, for example, with single-phase or three-phase alternating current. The on-board charger 3 converts, for example, the single-phase or three-phase alternating current supplied by the power supply 9 into direct current and supplies the battery 7 with direct current. Furthermore, the on-board charger 3 converts the direct current supplied by the battery 7 into alternating current and supplies the single-phase or three-phase alternating current to the consumer 8, which is connected to the AC socket or the on-board socket (not shown) of the vehicle 2.

[0023] The onboard charger 3 does not need to support both single-phase and three-phase AC and can be designed to operate on both. Furthermore, the onboard charger 3 is not limited to operation with single-phase and three-phase (multi-phase) AC and can be designed to operate on two-phase (multi-phase) AC.

[0024] Battery 7 is an example of an onboard battery installed in vehicle 2. Battery 7 stores power supplied by the power supply 9 via the onboard charger 3. It is sufficient for battery 7 to store power supplied to a traction motor (main electric motor), an electrical component mounted on vehicle 2, or a load 8 connected to the AC socket or the onboard socket (not shown) of vehicle 2. For example, battery 7 could be a lithium-ion battery, a nickel-hydrogen battery, or a solid-state battery.

[0025] Load 8 is an example of an external load that is supplied with power from battery 7 at the time of discharge. Load 8 is detachably connected to the AC socket or the vehicle's onboard socket (not shown) 2.

[0026] Consumer 8 can be an electronic device powered by vehicle 2, such as a household appliance or a smartphone. Load 8 can be an external energy storage device or a power source powered by vehicle 2, such as a home battery or a charging station's power pickup device. The charging station's power pickup device, acting as consumer 8, can be implemented by the power supply 9.

[0027] Power supply 9 is an example of an external power supply that provides power to battery 7 during the charging process. Power supply 9 can be any AC power supply, such as one attached to a fast-charging station or a standard commercial power supply. Power supply 9 is not limited to single-phase or three-phase (multi-phase) power supplies; a two-phase (multi-phase) power supply can also be used. Fig. Figure 1 shows as an example a case in which the single-phase AC power supply, which supplies the vehicle 2's on-board charger 3 (energy conversion device) with single-phase AC power, is used as power supply 9.

[0028] As in Fig. As shown in Figure 1, the power supply 9 comprises an AC voltage source 91 and a switch 93. The AC voltage source 91 generates alternating current, which is supplied to the vehicle 2. The switch 93 is electrically connected between a terminal of the power supply 9, which is electrically connected to the power supply line L, and the AC voltage source 91. The switch 93 operates in response to a control signal (CP) from the control circuit 31 to switch between the connection / disconnection between the AC voltage source 91 and the power supply line L. That is, the switch 93 toggles the supply / disconnection of power from the AC voltage source 91 to the power supply line L.

[0029] As in Fig. As shown in Figure 1, the onboard charger 3 comprises the control circuit 31, a power factor correction (PFC) circuit 32, and a DC / DC converter circuit 33. The onboard charger 3 according to the present disclosure is not limited to the configuration of Fig. 1 is limited, but can also have other configurations. For example, the power factor correction circuit 32 is not an essential component of the on-board charger 3, and another rectifier smoothing circuit can also be used.

[0030] The control circuit 31 controls the operation of the onboard charger 3. For example, the control circuit 31 acquires the outputs (sensor values) of the current sensors 321 and 331 and the voltage sensors 323 and 333 before and after charging and discharging, and during charging and discharging. The control circuit 31 monitors the acquired sensor values. For example, the control circuit 31 outputs a control signal to control the switching on and off of the power factor correction circuit 32 and the DC-DC converter circuit 33, as well as a certain amount of power for the power conversion. The control circuit 31 outputs a control signal, for example, to control the switching on and off of switches 61 and 93.

[0031] Furthermore, the control circuit 31 stops the charging and discharging process if the charging power or the discharging power (charging / discharging power) exceeds a predefined operating range. For example, if the charging power supplied to the power supply lines L and N exceeds the operating range at the time of charging, the control circuit 31 outputs a control signal to the power factor correction circuit 32 and / or the DC-DC converter circuit 33 to stop the power conversion (charging process). Additionally, for example, if the charging power supplied to the power supply lines L and N exceeds the operating range at the time of charging, the control circuit 31 outputs a control signal (CP signal) to the power supply unit 9 to stop the supply of AC current to the power supply lines L and N after the power conversion (the charging process) has stopped.For example, if the discharge power supplied to lines L and N of the power supply at the time of discharge exceeds the operating range, the control circuit 31 outputs a control signal to stop the current conversion (discharge process) to the power factor correction circuit 32 and / or the DC voltage converter circuit 33.

[0032] After the charging and discharging process is stopped if the charging / discharging power exceeds the specified operating range, or if the charging and discharging process is not performed, the control circuit 31 detects the sensor values ​​from the current sensors 321 and 331 and the voltage sensors 323 and 333 in a state where the power supply lines L and N are not supplied with energy for charging and discharging (charging / discharging power). Furthermore, the control circuit 31 detects an anomaly of a corresponding sensor if the sensor value deviates from an offset voltage in a state where the power supply lines L and N are not supplied with charging / discharging energy. The detection of a sensor anomaly is described below.

[0033] The control circuit 31 comprises, for example, at least one processor (not shown) and at least one memory (not shown) and has a hardware configuration similar to a standard computer. A digital signal processor (DSP) can be used as the control circuit 31. The control circuit 31 can implement any function of the control circuit 31 by, for example, the processor loading a program stored in a read-only memory (ROM) or similar into a working memory (RAM) and executing the loaded program, or by implementing some or all functions with a special hardware circuit (an integrated semiconductor circuit or similar).

[0034] The control circuit 31, which controls the operation of the power factor correction circuit 32 and the DC voltage converter circuit 33, and the control circuit 31, which detects the anomaly of the sensor, can be implemented by the same circuit or by independent, mutually independent circuits.

[0035] The control circuit 31 can be implemented by an electronic control unit (ECU) in the vehicle 2, a domain control unit (DCU) such as a cockpit domain controller (CDC) in which several ECUs are integrated, or a computer such as an on-board unit (OBU). Furthermore, the control circuit 31 can send and receive information to and from another control unit mounted in the vehicle 2 via an on-board network, which includes a controller area network (CAN), Ethernet (registered trademark), a universal serial bus (USB) (registered trademark), or similar, and the load 8 or power supply 9 connected to the vehicle 2, or communicate with an information processing device outside the vehicle 2 via a network such as the internet.

[0036] The power factor correction circuit 32 is electrically connected via the multiple power supply lines L and N between the AC socket or the vehicle's onboard socket (not shown) 2 and the DC-DC converter circuit 33. For example, when charging battery 7, the power factor correction circuit 32 rectifies and smooths an AC voltage from the power supply unit 9 to produce a DC voltage. When discharging battery 7, for example, the power factor correction circuit 32 produces an AC voltage using the DC voltage from the DC-DC converter circuit 33.

[0037] The DC-DC converter circuit 33 is electrically connected between the power factor correction circuit 32 and the battery 7 via the multiple power supply lines L and N. For example, when charging the battery 7, the DC-DC converter circuit 33 converts the DC voltage generated by the power factor correction circuit 32 back into an AC voltage and then performs rectification and smoothing to produce a DC voltage with any desired set voltage. Similarly, when discharging the battery 7, the DC-DC converter circuit 33 converts the DC voltage from the battery 7 into an AC voltage and then performs rectification and smoothing to produce a DC voltage with any desired set voltage.

[0038] The onboard charger 3 may also include a noise filter (not shown) that suppresses (removes) the ingress of noise from the power supply 9 and the emission of noise into the power supply 9. The noise filter is provided, for example, between the AC power socket or the onboard socket (not shown) of the vehicle 2 and the power factor correction circuit 32, but may also be provided at another location.

[0039] The power factor correction circuit 32 and the DC-DC converter circuit 33 according to the embodiment are examples of conversion circuits. The conversion circuit that converts the alternating current supplied by the power supply 9 to the multiple power supply lines L and N into direct current when the battery 7 is charged, and the conversion circuit that converts the direct current supplied by the battery 7 to the multiple power supply lines L and N into alternating current when discharging to the load 8 or the power supply 9, can have a common circuit design or partially or completely different circuit designs.

[0040] As in Fig. As shown in Figure 1, both the power factor correction circuit 32 and the DC voltage converter circuit 33 can contain at least one sensor. Fig. Figure 1 shows the current sensor 321 and the voltage sensor 323 as the sensors present in the power factor correction circuit 32. It also shows Fig. 1. The current sensor 331 and the voltage sensor 333 as sensors in the DC voltage converter circuit 33.

[0041] The current sensors 321 and 331 and the voltage sensors 323 and 333 may be sensors that are provided in the on-board charger 3 as external components of the power factor correction circuit 32 and the DC voltage converter circuit 33.

[0042] Furthermore, each of the current sensors 321 and 331 and the voltage sensors 323 and 333 relates to the power factor correction circuit 32 and the DC-DC converter circuit 33 and is located on the side of the battery 7 and / or the load 8 or the power supply 9. That is, the current sensor 331 and the voltage sensor 333 need not be located on the battery 7 side of the onboard charger 3. Alternatively, the current sensor 321 and the voltage sensor 323 need not be located on the load 8 or power supply 9 side of the onboard charger 3. Alternatively, the current sensor can be located at least on the battery 7 or load 8 or power supply 9 side, and the voltage sensor on the other side.

[0043] Here, each of the current sensors 321 and 331 and the voltage sensors 323 and 333 is an example of a sensor electrically connected to the power supply lines L and N. Furthermore, each of the current sensors 321 and 331 and the voltage sensors 323 and 333 is an example of a sensor that has an output offset, such that a sensor value of the applied offset voltage is output in a state where the charge / discharge voltage is not supplied to the power supply lines L and N. In addition, each of the current sensors 321 and 331 and the voltage sensors 323 and 333 is an example of a sensor configured to output a sensor value corresponding to a current or voltage of the charge / discharge power supplied to the power supply lines L and N. (Current sensor)

[0044] Fig. Figure 2 is a diagram showing an example of the design of a sensor 4a, which compares the current sensors 321 and 331 of Fig. 1 implemented. As in Fig. As shown in Figure 2, sensor 4a is a current sensor designed to detect the current flowing through the power supply line L using a shunt resistor Rs and an amplifier 51 (differential amplifier). Sensor 4a can also be a current sensor designed to detect the current using a Hall sensor.

[0045] In the example of Fig. The sensor 4a comprises the shunt resistor Rs, a first resistor R1a, a second resistor R2a, a third resistor R1b, a fourth resistor R2b, the amplifier 51, and an offset voltage 53. The shunt resistor Rs is a resistive element with a resistance value of Rs. The first resistor R1a and the third resistor R1b are resistive elements with a first resistance value of R1. The second resistor R2a and the fourth resistor R2b are resistors with a second resistance value of R2. The offset voltage source 53 is a voltage source that generates an offset voltage Voffset.

[0046] The shunt resistor Rs is electrically connected in series with the power supply line L. The shunt resistor Rs is electrically connected in parallel with a pair of input terminals of the amplifier 51. Specifically, one of the two input terminals of the amplifier 51 is electrically connected to one end of the shunt resistor Rs via the first resistor R1a. One of the two input terminals of the amplifier 51 is electrically connected to an output terminal of the amplifier 51 via the second resistor R2a. Similarly, the other input terminal of the amplifier 51 is electrically connected to the other end of the shunt resistor Rs via the third resistor R1b. The other input terminal of the amplifier 51 is electrically connected to one end of the offset voltage 53 via the fourth resistor R2b. The other end of the offset voltage 53 is electrically connected to the ground potential.The amplifier 51 is electrically connected to the control circuit 31. Additionally, a pair of power supply terminals of the amplifier 51 is electrically connected between a high-side power supply line VCC of sensor 4a and the low-side power supply line of ground potential (a line of the low-side power supply voltage VEE). That is, the power supply voltage VCC of sensor 4a provides a high-side power supply potential for the amplifier 51. Similarly, the ground potential line provides a low-side power supply potential for the amplifier 51.

[0047] Fig. Figure 3 is a diagram describing the detection of a sensor anomaly based on an operating range relating to sensor 4a, which includes current sensors 321 and 331. Fig. 1 implemented. In the example of Fig. The high-side and low-side potentials of the power supply for amplifier 51 are 3.3 V and 0 V, respectively. The offset voltage Voffset is 1.65 V.

[0048] Sensor 4a is designed to output a voltage value Vo, which corresponds to a current value I of the charging / discharging current supplied to the power supply line L, as expressed by the following formula. In sensor 4a, the offset voltage Voffset is applied to one of the two terminals of amplifier 51. Therefore, sensor 4a has an output offset such that the voltage value Vo of the offset voltage Voffset is output as a sensor value in a state where the charging / discharging current is not supplied to the power supply line L. Vo=Rs× / ×R2R1+Voffset

[0049] For example, if a current of 27.5 A or more flows through the power supply line L, the voltage value Vo (sensor value) of sensor 4a is 3.3 V, representing the high-side power supply potential for amplifier 51. In a case where, for example, a current of an upper limit (operating range max) of the operating range of the charging / discharging current of the onboard charger 3 flows through the power supply line L, the voltage value Vo (sensor value) from sensor 4a is VR1 V, representing a first voltage value. VR1 V, as the first voltage value corresponding to the charging / discharging current of the operating range max, is lower than the high-side power supply voltage VCC of sensor 4a and higher than the offset voltage Voffset. In this disclosure, the first voltage value corresponding to the charging / discharging current of the operating range max is an example of a sensing range max.

[0050] For example, if no charging / discharging current flows through the power supply line L (I = 0 [A]), the voltage value Vo (sensor value) of sensor 4a as offset voltage Voffset is 1.65 [V].

[0051] In a case where, for example, a current of a lower limit (operating range min) of the operating range of the onboard charger 3's charge / discharge current flows through the power supply line L, the voltage value Vo (sensor value) from sensor 4a is VR2 [V] as the second voltage value. VR2 [V], as the second voltage value corresponding to the charging / discharging current of the operating range min, is higher than the low-side power supply voltage VEE (e.g., 0 [V] as ground potential) and lower than the offset voltage Voffset. In this disclosure, the second voltage value corresponding to the charging / discharging current of the operating range min is an example of a sensing range min.

[0052] For example, if a current of -27.5 [A] or less flows through the power supply line L, the voltage value Vo (sensor value) from sensor 4a is 0 [V] as the low-side power supply potential VEE for amplifier 51.

[0053] In a state where the power supply lines L and N are not supplied with charging / discharging current, i.e., in a state of I = 0 [A] where the charging / discharging current does not flow through the power supply line L, a voltage value of Vo = 1.65 [V] is output as the sensor value, as expressed in formula (1). Under these circumstances, in a case where the sensor anomaly occurs and the voltage value Vo output as the sensor value is short-circuited to ground potential (power supply voltage VEE) or the power supply voltage VCC, even in a state where I = 0 [A], the charging / discharging current indicated by the sensor value will be at or below the operating range min or at or above the operating range max. That is, even in a state where I = 0 [A], the sensor value will be equal to or less than the detection range min or equal to or greater than the detection range max.

[0054] Therefore, the control circuit 31 detects a power supply fault (sensor anomaly) of sensor 4a when the sensor value, in a state where the charging / discharging current does not flow through the power supply line L, is equal to or higher than the first voltage value VR1 (maximum detection range), such as the high-side power supply potential (power supply voltage VCC) for amplifier 51. Likewise, the control circuit 31 detects a ground fault (sensor anomaly) of sensor 4a when the sensor value, in a state where the charging / discharging current does not flow through the power supply line L, is equal to or lower than the second voltage value VR2 (min detection range), such as the low-side power supply potential (ground potential) for amplifier 51.

[0055] As described above, the control circuit 31 can detect sensor anomalies, such as power supply failures or ground faults, of sensor 4a, which implements current sensors 321 and 331, based on the operating range of the charging / discharging current of the onboard charger 3. Furthermore, the control circuit 31 can determine whether an output of the high-side or low-side power supply voltage is caused by the sensor anomaly, such as the power supply failure or ground fault, or whether it is a measured value corresponding to the current value for each of the bidirectional current directions to handle both charging / discharging operations. (Voltage sensor)

[0056] Here, the main differences compared to sensor 4a are discussed. Fig. 2 described, and redundant descriptions are omitted accordingly.

[0057] Fig. Figure 4 is a diagram showing an example of the design of a sensor 4b, which compares the voltage sensors 323 and 333 of Fig. 1 implemented. Sensor 4b is a voltage sensor designed to detect a voltage value applied between the multiple power supply lines L and N using an amplifier 51. As in Fig. As shown in Figure 4, sensor 4b has the same design as sensor 4a in Figure 4. Fig. 2, except that the shunt resistor Rs is not present. Sensor 4b can be configured as a voltage sequence circuit. Each resistance value and offset voltage value of sensor 4b can be the same or different from each resistance value and offset voltage value of sensor 4a.

[0058] In the example of Fig. The sensor 4b comprises a first resistor R1a, a second resistor R2a, a third resistor R1b, a fourth resistor R2b, the amplifier 51, and an offset voltage 53. One of the two input terminals of the amplifier 51 is connected to the power supply line L via the first resistor R1a. One of the two input terminals of the amplifier 51 is electrically connected to an output terminal of the amplifier 51 via the second resistor R2a. Similarly, the other input terminal of the amplifier 51 is electrically connected to the power supply line N via the third resistor R1b. The other input terminal of the amplifier 51 is electrically connected to one end of the offset voltage 53 via the fourth resistor R2b.

[0059] Fig. Figure 5 is a diagram describing the detection of a sensor anomaly based on an operating range relating to sensor 4b, which includes voltage sensors 323 and 333. Fig. 1 implemented. In the example of Fig. 5 are the high-side and low-side potentials for the power supply of amplifier 51 and the offset voltage Voffset are the same as in the example of Fig. 2, but the high-side and low-side potentials for the power supply of amplifier 51 and the offset voltage Voffset may differ from those in the example of Fig. 2. Distinguish.

[0060] Sensor 4b is designed to output a voltage value Vo that corresponds to the voltage (VL-VN) of the charging / discharging voltage supplied to the multiple power supply lines L and N, as expressed by the following formula. In sensor 4b, the offset voltage Voffset is applied to one of the two terminals of amplifier 51. Therefore, sensor 4b has an output offset such that the voltage value Vo of the offset voltage Voffset is output as a sensor value in a state where the charging / discharging voltage is not applied between the multiple power supply lines L and N. Vo=(VL−VN)×R2R1+Voffset

[0061] For example, if a voltage of 430 V or more is applied between the multiple power supply lines L and N, the voltage value Vo (sensor value) of sensor 4b is 3.3 V, representing the high-side power supply potential for amplifier 51. In a case where, for example, a voltage at the upper limit (operating range max) of the operating range of the onboard charger 3's charge / discharge voltage is applied between the multiple power supply lines L and N, the voltage value Vo (sensor value) from sensor 4b is VR3 V, representing the third voltage value. VR3 V, representing the charging / discharging voltage of the operating range max, is lower than the high-side power supply voltage VCC of sensor 4b and higher than the offset voltage Voffset. In this disclosure, the third voltage value, representing the charging / discharging voltage of the operating range max, is an example of the sensing range max.

[0062] In a case where the charging / discharging voltage is not applied between the multiple power supply lines L and N, the voltage value Vo (sensor value) of sensor 4b is, for example, 1.65 [V] as the offset voltage Voffset.

[0063] In a case where, for example, a voltage of a lower limit (operating range min) of the operating range of the onboard charger 3's charge / discharge voltage is applied between the multiple power supply lines L and N, the voltage value Vo (sensor value) from sensor 4b VR4 [V] is a fourth voltage value. VR4 [V], as the fourth voltage value corresponding to the charging / discharging voltage of the operating range min, is higher than the low-side power supply voltage VEE (e.g., 0 [V] as ground potential) and lower than the offset voltage Voffset. In this disclosure, the fourth voltage value corresponding to the charging / discharging voltage of the operating range min is an example of the sensing range min.

[0064] For example, if a voltage of -430 [V] or less is applied between the multiple power supply lines L and N, the voltage value Vo (sensor value) from sensor 4b is 0 [V] as the low-side power supply potential VEE for amplifier 51.

[0065] In a state where the power supply lines L and N are not supplied with the charge / discharge voltage, i.e., in a state VL = VN = 0 [V], where the charge / discharge voltage is not present between the multiple power supply lines L and N, a voltage value Vo = 1.65 [V] is output as a sensor value, as specified in formula (2). Under these circumstances, in a case where the sensor anomaly occurs and the voltage value Vo output as a sensor value is short-circuited to ground potential (supply voltage VEE) or the supply voltage VCC, even in a state where VL = VN = 0 [V], the charge / discharge current indicated by the sensor value will be at or below the operating range min or at or above the operating range max. That is, even in a state where VL = VN = 0 [V], the sensor value will be equal to or less than the detection range min or equal to or greater than the detection range max.

[0066] Therefore, the control circuit 31 detects a power supply fault (sensor anomaly) of sensor 4b in a case where the sensor value, in a state where the charge / discharge voltage is not present between the multiple power supply lines L and N, is equal to or higher than the third voltage value VR3 (maximum detection range), such as the high-side power supply potential (power supply voltage VCC) for amplifier 51. Similarly, the control circuit 31 detects a ground fault (sensor anomaly) of sensor 4b if the sensor value, in a state where the charge / discharge voltage is not present between the multiple power supply lines L and N, is equal to or lower than the fourth voltage value VR4 (minim detection range), such as the low-side power supply potential (ground potential) for amplifier 51.

[0067] As described above, the control circuit 31 can detect the sensor anomaly, such as the power supply fault or the ground fault of sensor 4b, which implements the voltage sensors 323 and 333, based on the operating range of the charging / discharging voltage of the on-board charger 3.

[0068] Next, the detection of anomalies, which is carried out in the loading system 1 designed as above, will be described.

[0069] Fig. Figure 6 is a flowchart showing an example of a processing sequence for detecting a power supply fault or ground fault anomaly (sensor anomaly) of sensor 4a, which implements the current sensors 321 and 331, controlled by the control circuit 31 of Fig. 1 will be executed.

[0070] First, the control circuit 31 begins charging or discharging (S101). Then, the control circuit 31 detects the sensor value from sensor 4a and determines whether the charging / discharging current I indicated by the detected sensor value is within the operating range or not (S102). Whether the charging / discharging current I is within the operating range or not means here that the charging / discharging current I is equal to or higher than the minimum operating range and equal to or lower than the maximum operating range. This determination is not necessarily made by converting the detected sensor value into the charging / discharging current I, but can also be made by determining whether the sensor value is equal to or higher than the maximum detection range and equal to or lower than the minimum detection range. In sensor 4a, which implements the current sensor 321, the charging / discharging current I is an alternating current.In sensor 4a, which implements current sensor 331, the charging / discharging current I is a direct current. If the charging / discharging current is within the operating range (S102: Yes), the process repeats. Fig. 6 for example the processing of S102 until the charging / discharging process is complete.

[0071] If the charging / discharging current is not within the operating range (S102: No), the control circuit 31 stops the charging / discharging process (S103). That is, the control circuit 31 stops the charging / discharging process if the charging / discharging current I exceeds the maximum operating range or is below the minimum operating range. The control circuit 31 then determines whether the charging / discharging current I indicated by the sensor value is 0 "A" in a state where the charging / discharging current I is not flowing through the power supply line L, i.e., whether the sensor value in a state where the charging / discharging current I is not flowing through the power supply line L is the offset voltage Voffset or not (S104).

[0072] In a case where the detected charge / discharge current I is 0 "A", i.e., in a case where the sensor value of the charge / discharge current I corresponds to the offset voltage Voffset (S104: Yes), the control circuit 31 detects an overcurrent. In a case where the peak value of the charge / discharge current I, indicated by the detected sensor value, is low, e.g., in a case where the absolute value of the difference between the sensor value and the offset voltage Voffset is less than a predetermined threshold, the control circuit 31 can detect a current decrease (low current). The predetermined threshold is, for example, less than an absolute value of the detection range max or the detection range min. The sequence then ends. Fig. 6, and when the charging / discharging process resumes, the processing is performed again.

[0073] As described above, in the processing for sensor anomaly detection according to the present embodiment, the sensor anomaly is not detected if the sensor value is in a state where the charge / discharge current I is not flowing through the power supply line L, and the offset voltage Voffset indicates that the charge / discharge current I is 0 “A”.

[0074] On the other hand, in a case where the detected charge / discharge current I deviates from 0 "A", i.e., in a case where the sensor value of the charge / discharge current I deviates from the offset voltage Voffset (S104: No), the control circuit 31 determines that the sensor value of the charge / discharge current I is higher than the maximum detection range or lower than the minimum detection range (S106). That is, the control circuit 31 determines that the 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 anomalous (S107). In particular, in the case where the sensor value of the charging / discharging current I is higher than the detection range max, i.e. in the case where the detected charging / discharging current I is higher than the operating range max, the control circuit 31 detects a sensor anomaly of a short circuit in the power supply (power supply fault anomaly).If the sensor value of the charging / discharging current I is lower than the minimum detection range, i.e., if the detected charging / discharging current I is lower than the minimum operating range, the control circuit 31 detects a sensor anomaly of a ground short circuit (ground fault anomaly). The sequence of events then follows. Fig. 6 completed.

[0075] As described above, in the processing for the detection of sensor anomalies according to the present embodiment, in a case where the sensor value in a state in which the charging / discharging current I does not flow through the power supply line L deviates from the offset voltage Voffset, which indicates that the charging / discharging current I is 0 “A”, the power supply fault anomaly or the ground fault anomaly (sensor anomaly) is detected.

[0076] Fig. Figure 7 is a flowchart showing an example of a processing sequence for detecting anomalies in the event of power supply faults or ground faults (sensor anomalies) of sensor 4b, which implements the voltage sensors 323 and 333, controlled by the control circuit of Fig. 1 will be executed.

[0077] First, the control circuit 31 starts the power supply to the multiple power supply lines L and N and begins charging or discharging (S201). Then, the control circuit 31 detects the sensor value from sensor 4b and determines whether the charging / discharging voltage is within the operating range or not (S202). Whether the charging / discharging voltage is within the operating range or not means that the charging / discharging voltage is equal to or higher than the minimum operating range and equal to or lower than the maximum operating range. This determination is not necessarily made by converting the detected sensor value into the charging / discharging voltage, but can also be made by determining whether the sensor value is equal to or higher than the maximum detection range and equal to or lower than the minimum detection range. In sensor 4b, which implements the voltage sensor 323, the charging / discharging voltage is an alternating voltage (AC).In sensor 4b, which implements 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 process repeats. Fig. 7 for example the processing of S202 until the charging / discharging process is complete.

[0078] If the charge / discharge voltage is not within the operating range (S202: No), the control circuit 31 stops the supply of AC or DC current to the multiple power supply lines L and N and stops the charge / discharge process (S203). That is, the control circuit 31 stops the charge / discharge process if the charge / discharge voltage exceeds the maximum operating range or is lower than the minimum operating range. The control circuit 31 then determines whether the charge / discharge voltage indicated by the sensor value is 0 "V" in a state where the charge / discharge voltage is not present between the multiple power supply lines L and N, i.e., whether the sensor value is the offset voltage Voffset in a state where the charge / discharge voltage is not present between the multiple power supply lines L and N (S204).

[0079] In a case where the detected charge / discharge voltage is 0 "V", i.e., in a case where the sensor value of the charge / discharge voltage corresponds to the offset voltage Voffset (S204: Yes), the control circuit 31 detects an overvoltage. In a case where the peak value of the charge / discharge voltage indicated by the detected sensor value is low, e.g., in a case where the absolute value of the difference between the sensor value and the offset voltage Voffset is less than a predetermined threshold, the control circuit 31 can detect a voltage drop (low voltage). The predetermined threshold is, for example, less than an absolute value of the detection range max or the detection range min. The sequence then ends. Fig. 7, and when the charging / unloading process resumes, the processing is performed again.

[0080] As described above, in the processing of the sensor anomaly detection according to the present embodiment, the sensor anomaly is not detected if the sensor value in the state in which the charge / discharge voltage is not 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”.

[0081] On the other hand, in a case where the detected charge / discharge voltage deviates from 0 "V", i.e., in a case where the sensor value of the charge / discharge voltage deviates from the offset voltage Voffset (S204: No), the control circuit 31 determines that the sensor value of the charge / discharge voltage is higher than the maximum detection range or lower than the minimum detection range (S206). That is, the control circuit 31 determines that the detected charge / discharge voltage is higher than the maximum operating range or lower than the minimum operating range. In this case, the control circuit 31 determines that the sensor is anomalous (S207). Specifically, in a case where the sensor value of the charge / discharge voltage is higher than the maximum detection range, i.e., in a case where the detected charge / discharge voltage is higher than the maximum operating range, the control circuit 31 detects the sensor anomaly of a power supply short circuit (power supply fault).If the sensor value of the charging / discharging voltage is lower than the minimum detection range, i.e., if the detected charging / discharging voltage is lower than the minimum operating range, the control circuit 31 detects the sensor anomaly of a GND short circuit (ground fault anomaly). The sequence of events then follows. Fig. 7 completed.

[0082] As described above, in the processing for the detection of sensor anomalies according to the present embodiment, in a case where the sensor value deviates from the offset voltage Voffset, which indicates that the charge / discharge voltage is 0 “V”, in a state where the charge / discharge voltage is not present between the multiple power supply lines L and N, the anomaly of the power supply fault or the ground fault anomaly (sensor anomaly) is detected.

[0083] Fig. 6 and Fig. Figure 7 shows a case in which the processing is performed during charging / discharging, but the present invention is not limited to this. The sensor anomaly detection can occur at the beginning or end of the charging / discharging process, it can occur periodically during a period in which the charging / discharging process is not performed before the start of the charging / discharging process or after the end of the charging / discharging process, or it can be performed continuously or intermittently during the charging / discharging process. However, if the sensor anomaly is detected during a period in which the charging / discharging process is not performed before the start (including the start of the charging / discharging process) or after the end (including the end of the charging / discharging process), processing steps S101 to S103 of Fig. 6 or the processing steps S201 to S203 of Fig. 7 not executed.

[0084] As described above, in the charging system 1 according to the present embodiment, predetermined offset voltages are set in sensors 4a and 4b. Furthermore, the control circuit 31 acquires the sensor values ​​from sensors 4a and 4b in a state where the power supply lines L and N are not supplied with charging / discharging energy. The control circuit 31 then determines, based on whether the sensor value deviates from the offset voltage Voffset or not, whether the charging / discharging energy anomaly, such as overcurrent, overvoltage, or voltage drop, is detected by the normal sensors 4a and 4b or whether the sensor is abnormal.In particular, the control circuit 31 in the charging system 1 according to the present embodiment detects the sensor anomaly in a case in which the sensor values ​​of sensors 4a and 4b deviate from the offset voltage Voffset in a state in which the charging / discharging power is not supplied to the multiple power supply lines L and N.

[0085] Currently, the onboard charger 3 poses a risk of damage to the power supply 9 connected to an input side, the battery 7 connected to an output side, and an onboard component if a monitored sensor value becomes inaccurate and an overcurrent occurs where an input / output current exceeds a required current, or an overvoltage occurs where an input / output voltage exceeds an upper limit. Furthermore, if the monitored sensor value becomes inaccurate and a voltage drop occurs where the input / output voltage falls below a lower limit, the battery 7 may not charge or the load 8 may not function.

[0086] Therefore, the onboard charger 3 must constantly monitor whether the current sensors 321 and 331 and the voltage sensors 323 and 333 are working normally or not.

[0087] However, adding another sensor as a redundant sensor to monitor an anomaly presents the problem of increased costs or a larger mounting area for the component. Therefore, there is a need for a technique to detect anomalies without requiring an additional sensor. Furthermore, since the current directions are bidirectional to handle both charging and discharging, it is not possible to determine whether a sensor anomaly has occurred or whether a power supply anomaly has been detected by a standard sensor, even if the sensor reading is 0 [V] in a state where the power supply lines L and N are not energized (I = 0 [A], and VL = VN = 0 [V]).

[0088] Under these circumstances, the control circuit 31 in the charging system 1 according to the present embodiment can detect that the sensors 4a and 4b exhibit a power supply fault / ground fault anomaly if the charging / discharging voltage or charging / discharging current, based on the sensor value of sensor 4a or 4b for which the predetermined offset voltage is set, is not 0, even though the charging / discharging process is not taking place, e.g., after the charging / discharging process has ended. Therefore, with the charging system 1 according to the present embodiment, it is possible to detect (monitor) a sensor anomaly without adding a redundant sensor.Furthermore, it can be determined whether a sensor anomaly has occurred or a power anomaly has been detected by a normal sensor if the charge / discharge voltage or charge / discharge current is not 0 based on the sensor value, even though the charge / discharge process is not taking place. (Second embodiment)

[0089] In the embodiment described above, the charging system 1 is capable of detecting the power supply fault / ground fault anomaly as a sensor anomaly, based on the sensor value in a state where charging / discharging is not taking place and the operating range of the charging / discharging power. However, the present invention is not limited to this. The sensor anomaly is not limited to the case of a power supply short circuit or a ground short circuit, and an amplification fault, in which an amplification anomaly occurs and the sensor value becomes inaccurate, is also conceivable.

[0090] Therefore, in the present embodiment, a charging system 1 is described which is capable of detecting the gain error as an anomaly of the sensor. In the present embodiment, mainly the differences from the first embodiment are described, and redundant descriptions are accordingly omitted.

[0091] Fig. Figure 8 is a diagram showing an example of the design of a sensor 4c, which combines the current sensors 321 and 331 of Fig. 1 implemented, or a sensor 4d, which is the voltage sensors 323 and 333 of Fig. 1 implemented.

[0092] In the example of Fig. 8. Sensor 4c is the same as sensor 4a from Fig. 2, except that the first resistor R1a with the first resistance value R1, the second resistor R2a with the second resistance value R2, the third resistor R1b with the first resistance value R1, and the fourth resistor R2b with the second resistance value R2 are each expressed as a first resistor R1 with a first resistance value R1, a second resistor R2 with a second resistance value R2, a third resistor R3 with the first resistance value R1, and a fourth resistor R4 with the second resistance value R2. The sensor 4d has the same configuration as the sensor 4c, except that there is no shunt resistor Rs. Each resistance value and offset voltage value of the sensor 4d can be the same or different from each resistance value and offset voltage value of the sensor 4c.

[0093] Sensor 4c is designed to output a voltage value Vo, corresponding to the voltage (V1-V2) between shunt resistors generated in shunt resistor Rs, and a current value I, representing the charging / discharging current of the charging / discharging power supplied to a power supply line L, as expressed by the following formula. In sensor 4c, an offset voltage Voffset is applied to one of two terminals of an amplifier 51. The resistance values ​​of the first four resistors, R1 to R4, are chosen such that R1 = R2 and R3 = R4. Therefore, sensor 4c has an output offset, meaning that the voltage value Vo of the offset voltage Voffset is output as a sensor value when charging / discharging is stopped and I = 0 [A] or V1 = V2 = 0 [V]. Vo=R2R1V1−R4(R1+R2)R1(R3+R4)V2+R3(R1+R2)R1(R3+R4)Voffset

[0094] In the event of a power supply fault where the sensor value is short-circuited to the high-side power supply voltage VCC, or a ground fault where the sensor value is short-circuited 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, a control circuit 31 according to the present embodiment can detect the power supply fault or ground fault anomaly as a sensor anomaly, similar to the first embodiment.

[0095] Furthermore, in a case where an anomaly occurs in the respective resistance values ​​of the first to fourth resistors R1 to R4, i.e., an anomaly in gain, the expression R1 = R2 or R3 = R4 is not satisfied. Therefore, the coefficient of the third term on the right-hand side of formula (3) will not be 1, and the voltage value Vo will lie outside a predetermined range of variation of the offset voltage Voffset. The range of variation of the offset voltage Voffset is an example of a predetermined range based on the offset voltage Voffset. For example, the range of variation of the offset voltage Voffset is determined in advance based on the individual differences in the respective resistance values ​​of the first to fourth resistors R1 to R4 and stored in an internal memory of the control circuit 31 or the like.

[0096] Therefore, the control circuit 31 detects the gain error (sensor anomaly) of the sensor 4c in a case where the sensor value is outside the variation range of the offset voltage Voffset in a state where the charging / discharging current does not flow through the power supply line L.

[0097] Sensor 4d is described by replacing V2 with VL (voltage of the L phase) and V1 with VN (voltage of the N phase). This means that the control circuit 31 detects the gain error (sensor anomaly) of sensor 4d when the sensor value, in a state where no charge / discharge voltage is applied between multiple power supply lines L and N, lies outside the variation range of the offset voltage Voffset. Sensors 4c and 4d can have a common variation range or different variation ranges.

[0098] Fig. Figure 9 is a flowchart that illustrates an example of a processing sequence for detecting the gain error (sensor anomaly) of sensor 4a, which implements current sensors 321 and 331, or of sensor 4d, which implements voltage sensors 323 and 333, executed by control circuit 31 of Fig. 1.

[0099] The process of Fig. 9 is executed at the beginning or end of the charging / unloading process, or during a period in which the charging / unloading process is not carried out before the start of the charging / unloading process or after the end of the charging / unloading process. That is to say, the sequence of Fig. 9 is started, for example, in a state where a switch 61 of an on-board charger 3 and a switch 93 of a power supply 9 are switched off. The sequence of Fig. 9 can, for example, be understood as a series of processes preceding the expiration of Fig. 6 or Fig. 7 or, independently thereof, at another time.

[0100] The control circuit 31 determines whether the voltage value Vo output as sensor value is within the variation range (±α [%]) of the offset voltage Voffset (S301) or not.

[0101] If the voltage value Vo is outside the variation range of the offset voltage Voffset (S301: No), the control circuit 31 detects the gain error as a sensor anomaly (S302). The sequence of events is then as follows: Fig. 9 finished.

[0102] If, however, the voltage value Vo lies within the variation range of the offset voltage Voffset (S301: Yes), the control circuit 31 determines that the gain is normal (S303). After that, the sequence of Fig. 9 finished.

[0103] As described above, the charging system 1, according to the present embodiment, monitors whether the sensor value lies within the variation range of the offset voltage Voffset in a state where the power supply lines L and N are not supplied with charging / discharging power before the start of the charging process. The charging system 1 then detects the gain error (sensor anomaly) if the sensor value lies outside the variation range of the offset voltage Voffset in a state where the power supply lines L and N are not supplied with charging / discharging energy. With this design, it is possible to detect the presence or absence of a sensor anomaly and the type of sensor anomaly based on the sensor value when the charging / discharging process is stopped, without using a redundant sensor.

[0104] In the description according to each embodiment described above, the numerical values ​​of the current and voltage ranges corresponding to the offset voltage Voffset, the power supply voltages VCC and VEE, and the voltage value Vo (sensor value) of sensor 4 are merely examples and can be adjusted accordingly.

[0105] In each of the embodiments described above, the determination of whether it is A or not can be made by simply determining that it is A, or by simply determining that it is not A, or by determining whether it is A or not.

[0106] In each embodiment described above, “one of A” means “at least one of A”.

[0107] The program executed by each device of the loading system 1 according to each embodiment described above may be recorded on a computer-readable recording medium (computer program product) such as a CD-ROM, FD, CD-R or DVD as a file in an installable format or an executable format.

[0108] Furthermore, the program executed by each device of the charging system 1 according to each embodiment described above can be stored on a computer connected to a network such as the Internet and made available by downloading it over the network. In addition, the program executed by each device of the charging system 1 according to the embodiment described above can be made available or distributed via a network such as the Internet.

[0109] Furthermore, the program that is executed by each device of the charging system 1 according to each embodiment described above can be pre-stored in ROM or similar.

[0110] According to at least one of the embodiments described above, an anomaly of the sensor can be detected without the need to add a redundant sensor.

[0111] Although certain embodiments have been described, these embodiments are presented only as examples and are not intended to limit the scope of the inventions. Indeed, the novel methods and systems described herein can be embodied in a multitude of other embodiments. Furthermore, various omissions, substitutions, and modifications to the form of the methods and systems described herein can be made without departing from the spirit of the inventions. The appended claims and their equivalents are intended to cover such forms or modifications that would fall within the scope and spirit of the inventions. Additional note

[0112] The following techniques are disclosed by the above description of the above embodiments. (1) An anomaly detection device comprising: a sensor electrically connected to a power supply line that bidirectionally supplies current from an external power supply when charging an on-board battery and current from the on-board battery when discharging to an external load, wherein the sensor is configured to have an output offset such that a sensor value is output at an applied offset voltage in a state in which no charging / discharging current is supplied to the power supply line, and to output the sensor value corresponding to a current or voltage of the charging / discharging current supplied to the power supply line; and a control circuit designed to detect an anomaly of the sensor in a case where the sensor value deviates from the offset voltage in a state where the power supply line is not supplied with charging / discharging energy. (2) The anomaly detection device according to (1), in which the sensor includes a current sensor designed to output a voltage value as the sensor value, which corresponds to a current value of a charging / discharging current flowing through the power supply line, the sensor value, which corresponds to an upper limit of an operating range related to the charging / discharging current, is a first voltage value that is lower than a high-side power supply voltage of the current sensor and higher than the offset voltage, the sensor value, which corresponds to a lower limit of the operating range related to the charge / discharge current, is a second voltage value that is higher than a low-side power supply voltage of the current sensor and lower than the offset voltage, and The control circuit is designed to detect a power supply fault of the current sensor in a case where the sensor value is equal to or higher than the first voltage value in a state where the charging / discharging power is not supplied to the power supply line, and to detect a ground fault of the current sensor in a case where the sensor value is equal to or lower than the second voltage value in a state where the charging / discharging power is not supplied to the power supply line. (3) The anomaly detection device according to (1) or (2) comprising the current sensor: a shunt resistor that is electrically connected in series with the power supply line; an offset voltage source designed to generate the offset voltage; and An amplifier with an output terminal, a pair of input terminals, and a pair of power supply terminals, wherein the output terminal is electrically connected to the control circuit, wherein one of the pair of input terminals is electrically connected to one end of the shunt resistor via a first resistor with a first resistance value and electrically connected to the output terminal via a second resistor with a second resistance value, the other of the pair of input terminals is electrically connected to the other end of the shunt resistor via a third resistor with the first resistance value and electrically to the offset voltage source via a fourth resistor with the second resistance value, wherein the pair of power supply terminals is electrically connected between the high-side power supply voltage and the low-side power supply voltage of the sensor. (4) The anomaly detection device according to (2) or (3), in which The control circuit is designed to detect an amplification error of the current sensor in a case where the sensor value from the terminal is outside a predetermined range based on the offset voltage in a state where the charging / discharging power is not supplied to the power supply line. (5) The anomaly detection device according to one of (1) to (4), in which the sensor contains a voltage sensor designed to output as a sensor value a voltage value corresponding to a charging / discharging voltage that is applied between a voltage line and a neutral line contained in the power supply line, the sensor value, which corresponds to an upper limit of an operating range related to the charging / discharging 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, which corresponds to a lower limit of the operating range related to the charge / discharge voltage, is a fourth voltage value that is higher than a low-side power supply voltage of the voltage sensor and lower than the offset voltage, and The control circuit is designed to detect a power supply fault of the voltage sensor in a case where 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 to detect a ground fault of the voltage sensor in a case where the sensor value is equal to or lower than the fourth voltage value in a state where the charging / discharging power is not supplied to the power supply line. (6) The anomaly detection device according to one of (1) to (5), wherein the voltage sensor comprises: an offset voltage source designed to generate the offset voltage; and An amplifier with an output terminal, a pair of input terminals, and a pair of power supply terminals, wherein the output terminal is electrically connected to the control circuit, wherein one of the pair of input terminals is electrically connected to the voltage line via a first resistor with a first resistance value and electrically to the output terminal via a second resistor with a second resistance value, the other of the pair of input terminals is electrically connected to the neutral line via a third resistor with the first resistance value and electrically to the offset voltage source via a fourth resistor with the second resistance value, wherein the pair of power supply terminals is electrically connected between the high-side voltage and the low-side power supply voltage of the sensor. (7) The anomaly detection device according to (5) or (6), wherein The control circuit is designed to detect an amplification error of the voltage sensor in a case where the sensor value from the terminal is outside a predetermined range based on the offset voltage in a state where the power supply line is not supplied with charging / discharging power. (8) An onboard charger, comprising: the anomaly detection device according to one of (1) to (7); and a conversion circuit designed to convert alternating current supplied by the external power supply to the power supply line into direct current when the on-board battery is being charged, in which the sensor is provided in the reversing circuit for the external power supply and / or the on-board battery. (9) An onboard charger, comprising: the anomaly detection device according to one of (1) to (7); and a conversion circuit designed to convert alternating current supplied by the external power supply to the power supply line into direct current when the on-board battery is being charged, in which The control circuit is designed to output a control signal in a case where the charging power exceeds a predetermined operating range, in order to stop the supply of alternating current to the power supply line and to detect an anomaly of the sensor based on the sensor value in a state where the charging power is not supplied to the power supply line. (10) An onboard charger, comprising: the anomaly detection device according to one of (1) to (7); and a conversion circuit designed to convert direct current supplied by the on-board battery to alternating current when it discharges to the external load, at which The sensor is provided in the reversing circuit for the external power supply and / or the on-board battery. (11) An onboard charger, comprising: the anomaly detection device according to one of (1) to (7); and a conversion circuit designed to convert direct current supplied by the on-board battery to alternating current when it discharges to the external load, at which The control circuit is designed to stop the operation of the power supply line in a case where the conversion circuit exceeds a predetermined operating range and to detect a sensor anomaly based on the sensor value in a state where the power supply is not supplied to the conversion circuit. (12) An anomaly detection procedure, comprising: by a control circuit of an anomaly detection device comprising a sensor electrically connected to a power supply line, which supplies current bidirectionally from an external power supply when charging an on-board battery and current from an on-board battery when discharging to an external load, wherein the sensor is configured to have an output offset such that a sensor value of an applied offset voltage is output in a state in which no charging / discharging current is supplied to the power supply line, and to output the sensor value corresponding to a current or voltage of the charging / discharging current supplied to the power supply line, Detecting a sensor anomaly in a case where the sensor value deviates from the offset voltage in a state where the power supply line is not supplied with charging / discharging energy. (13) The anomaly detection procedure according to (12), in which the sensor includes a current sensor designed to output a voltage value as the sensor value, which corresponds to a current value of a charging / discharging current flowing through the power supply line, the sensor value, which corresponds to an upper limit of an operating range related to the charging / discharging current, is a first voltage value that is lower than a high-side power supply voltage of the current sensor and higher than the offset voltage, the sensor value, which corresponds to a lower limit of the operating range related to the charge / discharge current, is a second voltage value that is higher than a low-side power supply voltage of the current sensor and lower than the offset voltage, and a power supply fault of the current sensor is detected in a case where the sensor value is equal to or higher than the first voltage value in a state where the charging / discharging power is not supplied to the power supply line, and a ground fault of the current sensor is detected in a case where the sensor value is equal to or lower than the second voltage value in a state where the charging / discharging power is not supplied to the power supply line. (14) The anomaly detection method according to (12) or (13) wherein the current sensor comprises: a shunt resistor that is electrically connected in series with the power supply line; an offset voltage source designed to generate the offset voltage; and An amplifier with an output terminal, a pair of input terminals, and a pair of power supply terminals, wherein the output terminal is electrically connected to the control circuit, wherein one of the pair of input terminals is electrically connected to one end of the shunt resistor via a first resistor with a first resistance value and electrically connected to the output terminal via a second resistor with a second resistance value, the other of the pair of input terminals is electrically connected to the other end of the shunt resistor via a third resistor with the first resistance value and electrically to the offset voltage source via a fourth resistor with the second resistance value, wherein the pair of power supply terminals is electrically connected between the high-side power supply voltage and the low-side power supply voltage of the sensor. (15) The anomaly detection procedure according to (13) or (14), in which A gain error of the current sensor is detected in a case where the sensor value from the connection, in a state where the power supply line is not supplied with charging / discharging energy, is outside a predetermined range based on the offset voltage. (16) The anomaly detection procedure according to a section of (12) to (15), in which the sensor contains a voltage sensor designed to output as a sensor value a voltage value corresponding to a charging / discharging voltage that is applied between a voltage line and a neutral line contained in the power supply line, the sensor value, which corresponds to an upper limit of an operating range related to the charging / discharging 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, which corresponds to a lower limit of the operating range related to the charge / discharge voltage, is a fourth voltage value that is higher than a low-side power supply voltage of the voltage sensor and lower than the offset voltage, and A voltage sensor power supply fault is detected in a case where the sensor value is equal to or higher than the third voltage value in a state where the power supply line is not supplied with charging / discharging energy, and a voltage sensor ground fault is detected in a case where the sensor value is equal to or lower than the fourth voltage value in a state where the power supply line is not supplied with charging / discharging energy. (17) The anomaly detection method according to (12) to (16), wherein the voltage sensor comprises: an offset voltage source designed to generate the offset voltage; and An amplifier with an output terminal, a pair of input terminals, and a pair of power supply terminals, wherein the output terminal is electrically connected to the control circuit, wherein one of the pair of input terminals is electrically connected to the voltage line via a first resistor with a first resistance value and electrically to the output terminal via a second resistor with a second resistance value, the other of the pair of input terminals is electrically connected to the neutral line via a third resistor with the first resistance value and electrically to the offset voltage source via a fourth resistor with the second resistance value, wherein the pair of power supply terminals is electrically connected between the high-side voltage and the low-side power supply voltage of the sensor. (18) The anomaly detection procedure according to (16) or (17), in which A gain error of the voltage sensor is detected in a case where the sensor value from the connection, in a state where the power supply line is not supplied with charging / discharging energy, is outside a predetermined range based on the offset voltage. (19) The anomaly detection procedure according to a section of (12) to (18), in which the method for detecting anomalies is carried out by the control circuit in an on-board charger, which includes the anomaly detection device and a conversion circuit designed to convert alternating current supplied to the power supply line from the external power supply to direct current when charging the on-board battery, and The sensor is provided in the reversing circuit for the external power supply and / or the on-board battery. (20) The anomaly detection procedure according to a section of (12) to (19), in which in an onboard charger that includes the anomaly detection device and a conversion circuit designed to convert alternating current fed into the power supply line from the external power supply into direct current when charging the onboard battery, through the control circuit, A control signal to stop the supply of alternating current to the power supply line is issued to the converter circuit to the external power supply when the charging power exceeds a predetermined operating range, and a sensor anomaly is detected based on the sensor value in a state where the charging power is not supplied to the power supply line. (21) The anomaly detection procedure according to a section of (12) to (20), in which the method for detecting anomalies is carried out by the control circuit in an on-board charger which includes the anomaly detection device and a conversion circuit designed to convert direct current supplied by the on-board battery to alternating current when it discharges to the external load, and The sensor is provided in the reversing circuit for the external power supply and / or the on-board battery. (22) The anomaly detection procedure according to a section of (12) to (21), in which in an onboard charger that includes the anomaly detection device and a conversion circuit designed to convert a direct current supplied by the onboard battery to the power supply line into alternating current when it discharges to the external load, through the control circuit, Operation of the reversing circuit is stopped in a case where the discharge power exceeds a predetermined operating range, and an anomaly of the sensor is detected based on the sensor value in a state where the discharge power is not being supplied to the power supply line. (23) A vehicle comprising: the onboard charger after one of (8) to (11); and the onboard battery. (24) A program that causes a computer to perform the anomaly detection procedure according to one of (12) to (22). (25) A storage medium (computer program product) on which the program to be executed by a computer according to (24) is recorded. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2007-099033 A

[0003]

Claims

[1] Anomaly detection device comprising: a sensor electrically connected to a power supply line that bidirectionally supplies current from an external power supply when charging an on-board battery and current from the on-board battery when discharging to an external load, wherein the sensor is configured to have an output offset such that a sensor value is output at an applied offset voltage in a state in which no charging / discharging current is supplied to the power supply line, and to output the sensor value corresponding to a current or voltage of the charging / discharging current supplied to the power supply line; and a control circuit designed to detect an anomaly of the sensor in a case where the sensor value deviates from the offset voltage in a state where the power supply line is not supplied with charging / discharging energy. [2] Anomaly detection device according to claim 1, wherein the sensor includes a current sensor designed to output a voltage value as the sensor value, which corresponds to a current value of a charging / discharging current flowing through the power supply line, the sensor value, which corresponds to an upper limit of an operating range related to the charging / discharging current, is a first voltage value that is lower than a high-side power supply voltage of the current sensor and higher than the offset voltage, the sensor value, which corresponds to a lower limit of the operating range related to the charge / discharge current, is a second voltage value that is higher than a low-side power supply voltage of the current sensor and lower than the offset voltage, and The control circuit is designed to detect a power supply fault of the current sensor in a case where the sensor value is equal to or higher than the first voltage value in a state where charging / discharging power is not supplied to the power supply line, and to detect a ground fault of the current sensor in a case where the sensor value is equal to or lower than the second voltage value in a state where charging / discharging power is not supplied to the power supply line. [3] Anomaly detection device according to claim 2, wherein the current sensor comprises: a shunt resistor that is electrically connected in series with the power supply line; an offset voltage source designed to generate the offset voltage; and An amplifier with an output terminal, a pair of input terminals, and a pair of power supply terminals, wherein the output terminal is electrically connected to the control circuit, wherein one of the pair of input terminals is electrically connected to one end of the shunt resistor via a first resistor with a first resistance value and electrically connected to the output terminal via a second resistor with a second resistance value, the other of the pair of input terminals is electrically connected to the other end of the shunt resistor via a third resistor with the first resistance value and electrically to the offset voltage source via a fourth resistor with the second resistance value, wherein the pair of power supply terminals is electrically connected between the high-side power supply voltage and the low-side power supply voltage of the sensor. [4] Anomaly detection device according to claim 3, wherein the control circuit is configured to detect an amplification error of the current sensor in a case where the sensor value from the 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. [5] Anomaly detection device according to claim 1, wherein the sensor contains a voltage sensor designed to output as a sensor value a voltage value corresponding to a charging / discharging voltage that is applied between a voltage line and a neutral line contained in the power supply line, the sensor value, which corresponds to an upper limit of an operating range related to the charging / discharging 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, which corresponds to a lower limit of the operating range related to the charge / discharge voltage, is a fourth voltage value that is higher than a low-side power supply voltage of the voltage sensor and lower than the offset voltage, and The control circuit is designed to detect a power supply fault of the voltage sensor in a case where 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 to detect a ground fault of the voltage sensor in a case where the sensor value is equal to or lower than the fourth voltage value in a state where the charging / discharging power is not supplied to the power supply line. [6] Anomaly detection device according to claim 5, wherein the voltage sensor comprises: an offset voltage source designed to generate the offset voltage; and An amplifier with an output terminal, a pair of input terminals, and a pair of power supply terminals, wherein the output terminal is electrically connected to the control circuit, wherein one of the pair of input terminals is electrically connected to the voltage line via a first resistor with a first resistance value and electrically to the output terminal via a second resistor with a second resistance value, the other of the pair of input terminals is electrically connected to the neutral line via a third resistor with the first resistance value and electrically to the offset voltage source via a fourth resistor with the second resistance value, wherein the pair of power supply terminals is electrically connected between the high-side voltage and the low-side power supply voltage of the sensor. [7] Anomaly detection device according to claim 6, wherein the control circuit is configured to detect an amplification error of the voltage sensor in a case where the sensor value from the terminal in a state where the power supply line is not supplied with charging / discharging power is outside a predetermined range based on the offset voltage. [8] On-board charger, including: the anomaly detection device according to any one of claims 1 to 7; and a conversion circuit designed to convert alternating current supplied by the external power supply to the power supply line into direct current when the on-board battery is being charged, wherein The sensor is provided in the reversing circuit for the external power supply and / or the on-board battery. [9] Onboard charger, including: the anomaly detection device according to any one of claims 1 to 7; and a conversion circuit designed to convert alternating current supplied by the external power supply to the power supply line into direct current when the on-board battery is being charged, wherein The control circuit is designed to output a control signal in a case where the charging power exceeds a predetermined operating range, in order to stop the supply of alternating current to the power supply line and to detect an anomaly of the sensor based on the sensor value in a state where the charging power is not supplied to the power supply line. [10] Onboard charger, including: the anomaly detection device according to any one of claims 1 to 7; and a conversion circuit designed to convert direct current supplied from the on-board battery to the power supply line into alternating current when it discharges to the external load, wherein The sensor is provided in the reversing circuit for the external power supply and / or the on-board battery. [11] Onboard charger, comprising: the anomaly detection device according to any one of claims 1 to 7; and a conversion circuit designed to convert direct current supplied from the on-board battery to the power supply line into alternating current when it discharges to the external load, wherein The control circuit is designed to stop the operation of the power supply line in a case where the conversion circuit exceeds a predetermined operating range and to detect a sensor anomaly based on the sensor value in a state where the power supply is not supplied to the conversion circuit. [12] Anomaly detection procedures, including: by a control circuit of an anomaly detection device comprising a sensor electrically connected to a power supply line, which supplies current bidirectionally from an external power supply when charging an on-board battery and current from an on-board battery when discharging to an external load, wherein the sensor is configured to have an output offset such that a sensor value of an applied offset voltage is output in a state in which no charging / discharging current is supplied to the power supply line, and to output the sensor value corresponding to a current or voltage of the charging / discharging current supplied to the power supply line, Detecting a sensor anomaly in a case where the sensor value deviates from the offset voltage in a state where the power supply line is not supplied with charging / discharging energy. [13] Anomaly detection method according to claim 12, wherein the sensor includes a current sensor designed to output a voltage value as the sensor value, which corresponds to a current value of a charging / discharging current flowing through the power supply line, the sensor value, which corresponds to an upper limit of an operating range related to the charging / discharging current, is a first voltage value that is lower than a high-side power supply voltage of the current sensor and higher than the offset voltage, the sensor value, which corresponds to a lower limit of the operating range related to the charge / discharge current, is a second voltage value that is higher than a low-side power supply voltage of the current sensor and lower than the offset voltage, and a power supply fault of the current sensor is detected in a case where the sensor value is equal to or higher than the first voltage value in a state where the charging / discharging power is not supplied to the power supply line, and a ground fault of the current sensor is detected in a case where the sensor value is equal to or lower than the second voltage value in a state where the charging / discharging power is not supplied to the power supply line. [14] Anomaly detection method according to claim 13, wherein the current sensor comprises: a shunt resistor that is electrically connected in series with the power supply line; an offset voltage source designed to generate the offset voltage; and An amplifier with an output terminal, a pair of input terminals, and a pair of power supply terminals, wherein the output terminal is electrically connected to the control circuit, wherein one of the pair of input terminals is electrically connected to one end of the shunt resistor via a first resistor with a first resistance value and electrically connected to the output terminal via a second resistor with a second resistance value, the other of the pair of input terminals is electrically connected to the other end of the shunt resistor via a third resistor with the first resistance value and electrically to the offset voltage source via a fourth resistor with the second resistance value, wherein the pair of power supply terminals is electrically connected between the high-side power supply voltage and the low-side power supply voltage of the sensor. [15] Anomaly detection method according to claim 14, wherein a gain error of the current sensor is detected in a case in which the sensor value from the terminal in a state in which the power supply line is not supplied with charging / discharging energy is outside a predetermined range based on the offset voltage. [16] Anomaly detection method according to claim 12, wherein the sensor contains a voltage sensor designed to output as a sensor value a voltage value corresponding to a charging / discharging voltage that is applied between a voltage line and a neutral line contained in the power supply line, the sensor value, which corresponds to an upper limit of an operating range related to the charging / discharging 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, which corresponds to a lower limit of the operating range related to the charge / discharge voltage, is a fourth voltage value that is higher than a low-side power supply voltage of the voltage sensor and lower than the offset voltage, and A voltage sensor power supply fault is detected in a case where the sensor value is equal to or higher than the third voltage value in a state where the power supply line is not supplied with charging / discharging energy, and a voltage sensor ground fault is detected in a case where the sensor value is equal to or lower than the fourth voltage value in a state where the power supply line is not supplied with charging / discharging energy. [17] Anomaly detection method according to claim 16, wherein the voltage sensor comprises: an offset voltage source designed to generate the offset voltage; and An amplifier with an output terminal, a pair of input terminals, and a pair of power supply terminals, wherein the output terminal is electrically connected to the control circuit, wherein one of the pair of input terminals is electrically connected to the voltage line via a first resistor with a first resistance value and electrically to the output terminal via a second resistor with a second resistance value, the other of the pair of input terminals is electrically connected to the neutral line via a third resistor with the first resistance value and electrically to the offset voltage source via a fourth resistor with the second resistance value, wherein the pair of power supply terminals is electrically connected between the high-side voltage and the low-side power supply voltage of the sensor. [18] Anomaly detection method according to claim 17, wherein a gain error of the voltage sensor is detected in a case in which the sensor value from the terminal in a state in which the power supply line is not supplied with charging / discharging energy is outside a predetermined range based on the offset voltage. [19] Anomaly detection method according to any one of claims 12 to 18, wherein in an onboard charger that includes the anomaly detection device and a conversion circuit designed to convert alternating current fed into the power supply line from the external power supply into direct current when charging the onboard battery, by means of the control circuit, A control signal to stop the supply of alternating current to the power supply line is output to the converter circuit to the external power supply when the charging power exceeds a predetermined operating range, and a sensor anomaly is detected based on the sensor value in a state where the charging power is not supplied to the power supply line. [20] Anomaly detection method according to any one of claims 12 to 18, wherein in an onboard charger that includes the anomaly detection device and a conversion circuit designed to convert direct current supplied by the onboard battery to alternating current when it discharges to the external load, through the control circuit, The operation of the reversing circuit is stopped in a case where the discharge power exceeds a predetermined operating range, and a sensor anomaly is detected based on the sensor value in a state where the discharge power is not being supplied to the power supply line.

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