JP4665890B2 - Power supply device and vehicle equipped with power supply device - Google Patents

Description

  The present invention relates to a power supply device and a vehicle including the power supply device, and more particularly to a power supply device including a plurality of voltage converters and a vehicle including the power supply device.

  In recent years, environmentally friendly vehicles such as electric vehicles, fuel cell vehicles, and hybrid vehicles using both a motor and an engine have attracted attention. In a vehicle equipped with such a power supply device, it is also considered to install a plurality of batteries.

In general, in order to control a plurality of batteries, a plurality of current sensors are provided corresponding to each of the plurality of batteries. For example, Japanese Patent Laid-Open No. 9-233710 (Patent Document 1) discloses a charging rectifier circuit, a plurality of batteries, a plurality of voltage converters that perform voltage conversion between each battery and the charging rectifier circuit, and a plurality of voltages. Disclosed is a charging / discharging device including a plurality of current sensors provided corresponding to converters.
JP-A-9-233710 JP 2006-136167 A JP-A-8-223798 Japanese Patent Laid-Open No. 11-69880

  In order to extend the travel distance while maintaining the maximum output when traveling with only the electric power of the battery, it is considered to install a plurality of types of batteries in the hybrid vehicle. Even in such a case, it is conceivable to use a plurality of voltage converters.

  As described above, in order to perform independent current control for a plurality of converters, it is usually necessary to install a current sensor in each converter. However, it is not preferable to increase the number of current sensors because the cost of the current sensor itself is high and it takes effort and cost to maintain the reliability of the current sensor.

  An object of the present invention is to provide a power supply device capable of suppressing an increase in the number of current sensors and a vehicle including the power supply device.

  In summary, the present invention is a power supply device capable of supplying power to a load device. The power supply device is provided between the first and second power storage devices, a power line configured to exchange power between the power supply device and the load device, and the first power storage device and the power line, A first converter that performs voltage conversion between the first power storage device and the power line, and a voltage converter that is provided between the second power storage device and the power line, and performs voltage conversion between the second power storage device and the power line. A second converter; a first current detection unit that detects a current input to and output from the first power storage device and outputs a first detection result; and a second current that detects a current flowing through the load device. A second current detection unit that outputs the detection result of the first and second control units that control the first and second converters based on the first and second detection results.

  Preferably, the control device calculates a current value input / output to / from the second power storage device from the first and second detection results. Based on the calculation result, the control device controls the second converter so that the current value input / output to / from the second power storage device becomes the first current target value.

  More preferably, the control device controls the first converter so that the voltage value of the power line becomes the voltage target value when the load device is driven. When charging the first power storage device with the load device stopped, the control device controls the first converter so that the current value of the first power storage device becomes the second current target value.

  More preferably, the second current detection unit outputs a result of detecting a current value between the power line and the load device as a second detection result.

  More preferably, the load device includes an inverter connected to the power line and a three-phase AC rotating electric machine driven by the inverter. A 2nd electric current detection part outputs the result of having detected the alternating current which flows into a three-phase alternating current rotating electrical machine as a 2nd detection result. The power supply apparatus further includes a voltage sensor that detects a voltage of the power line. The control device calculates a current value between the power line and the inverter using the AC voltage of the three-phase AC rotating electric machine, the second detection result, and the detection voltage from the voltage sensor. The control device calculates a current value input / output to / from the second power storage device using the calculated current value and the first detection result.

  More preferably, each of the first and second current detection units includes at least first and second current sensors. The control device performs failure detection by comparing the outputs of the first and second current sensors with respect to each of the first and second current detection units. The control device controls the second converter so that the voltage value of the power line becomes the voltage target value when a failure of one of the first and second current detection units is detected. When it is detected that both the first and second current detectors have failed, the control device executes a predetermined abnormality process.

Preferably, the voltage value of the first power storage device is smaller than the voltage value of the second power storage device.
Preferably, the capacity value of the first power storage device is smaller than the capacity value of the second power storage device.

Preferably, another load device different from the load device is connected to the first power storage device.
When the other situation of this invention is followed, it is a power supply device which can supply electric power to a load apparatus. The power supply device is provided between the power storage device, the power line configured to be able to transfer power between the power supply device and the load device, the power storage device and the power line, and the voltage between the power storage device and the power line. A converter that performs conversion, a current detection unit that detects a current flowing through the load device, and a control device that controls the converter based on a detection result of the current detection unit are provided.

  Preferably, the load device includes an inverter connected to the power line and a three-phase AC rotating electric machine driven by the inverter. A current detection part outputs the result of having detected the alternating current which flows into a three-phase alternating current rotating electrical machine as a detection result. The power supply apparatus further includes a voltage sensor that detects a voltage of the power line. The control device calculates a current value between the power line and the inverter using the AC voltage of the three-phase AC rotating electric machine, the detection result, and the detection voltage from the voltage sensor. The control device controls the converter using the calculation result.

  According to still another aspect of the present invention, a vehicle is provided with the power supply device described above.

  According to the present invention, it is possible to realize a power supply device capable of suppressing an increase in the number of current sensors.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
FIG. 1 is an overall block diagram of a vehicle according to Embodiment 1 of the present invention.

  Referring to FIG. 1, vehicle 100 includes a power supply device 1 and a driving force generation unit 3 that is a load device. The driving force generator 3 includes inverters 30-1 and 30-2, motor generators 34-1 and 34-2, a power transmission mechanism 36, a drive shaft 38, and a drive ECU (Electronic Control Unit) 32. .

  Inverters 30-1 and 30-2 are connected in parallel to main positive bus MPL and main negative bus MNL. Inverters 30-1 and 30-2 convert driving power (DC power) supplied from power supply device 1 into AC power and output the AC power to motor generators 34-1 and 34-2, respectively. Inverters 30-1 and 30-2 convert AC power generated by motor generators 34-1 and 34-2 into DC power and output it to power supply device 1 as regenerative power.

  In addition, each inverter 30-1, 30-2 consists of a bridge circuit containing the switching element for three phases, for example. Inverters 30-1 and 30-2 drive corresponding motor generators by performing a switching operation in accordance with drive signals PWM1 and PWM2 from drive ECU 32, respectively.

  Motor generators 34-1 and 34-2 receive the AC power supplied from inverters 30-1 and 30-2, respectively, and generate rotational driving force. Motor generators 34-1 and 34-2 generate AC power in response to external rotational force. For example, motor generators 34-1 and 34-2 are made of a three-phase AC rotating electric machine including a rotor in which permanent magnets are embedded. Motor generators 34-1 and 34-2 are connected to power transmission mechanism 36, and a rotational driving force is transmitted to wheels (not shown) via drive shaft 38 further connected to power transmission mechanism 36. .

  When driving force generating unit 3 is applied to a hybrid vehicle, motor generators 34-1 and 34-2 are also connected to an engine (not shown) via power transmission mechanism 36 or driving shaft 38. The Control is executed by drive ECU 32 so that the drive force generated by the engine and the drive force generated by motor generators 34-1 and 34-2 have an optimal ratio. When applied to such a hybrid vehicle, either one of the motor generators 34-1 and 34-2 may function exclusively as an electric motor, and the other motor generator may function exclusively as a generator.

  Drive ECU 32 obtains torque target values TR1 and TR2 and rotation speed target values MRN1 and MRN2 of motor generators 34-1 and 34-2 based on signals transmitted from respective sensors (not shown), travel conditions, accelerator opening, and the like. calculate. Then, drive ECU 32 generates drive signal PWM1 and controls inverter 30-1 so that the generated torque and the rotation speed of motor generator 34-1 become torque target value TR1 and rotation speed target value MRN1, respectively. Drive signal PWM2 is generated to control inverter 30-2 so that the generated torque and the rotational speed of 34-2 become torque target value TR2 and rotational speed target value MRN2, respectively. Further, drive ECU 32 outputs calculated torque target values TR1, TR2 and rotation speed target values MRN1, MRN2 to converter ECU 2 (described later) of power supply device 1.

  On the other hand, the power supply device 1 includes a main body unit 20 and a current detection unit 16. Main body 20 includes power storage devices 6-1 and 6-2, converters 8-1 and 8-2, smoothing capacitor C, converter ECU 2, battery ECU 4, current detection unit 10, and voltage sensor 12-1. , 12-2, 18 and temperature sensors 14-1, 14-2.

  The power storage devices 6-1 and 6-2 are DC power sources that can be charged and discharged, and include, for example, secondary batteries such as nickel metal hydride batteries and lithium ion batteries. Power storage device 6-1 is connected to converter 8-1 via positive line PL1 and negative line NL1, and power storage device 6-2 is connected to converter 8-2 via positive line PL2 and negative line NL2. Is done. Note that the power storage devices 6-1 and 6-2 may be configured by electric double layer capacitors.

  Converter 8-1 is provided between power storage device 6-1 and main positive bus MPL and main negative bus MNL, and based on drive signal PWC1 from converter ECU 2, power storage device 6-1 and main positive bus MPL and Voltage conversion is performed with the main negative bus MNL. Converter 8-2 is provided between power storage device 6-2 and main positive bus MPL and main negative bus MNL, and based on drive signal PWC2 from converter ECU 2, power storage device 6-2 and main positive bus MPL and Voltage conversion is performed with the main negative bus MNL.

  Smoothing capacitor C is connected between main positive bus MPL and main negative bus MNL, and reduces power fluctuation components contained in main positive bus MPL and main negative bus MNL. Voltage sensor 18 detects a voltage value Vh between main positive bus MPL and main negative bus MNL, and outputs the detection result to converter ECU 2.

  Current detection unit 10 detects current value Ib1 input / output to / from power storage device 6-1, and outputs the detection result to converter ECU 2 and battery ECU 4. Current detection unit 10 detects a current (discharge current) output from the corresponding power storage device as a positive value, and detects a current (charge current) input to the corresponding power storage device as a negative value. In addition, although the case where the current detection unit 10 detects the current value of the positive electrode line PL1 is shown in the figure, the current detection unit 10 may detect the current of the negative electrode line NL1.

  The current detection unit 16 includes current sensors 16-1 and 16-2. Current sensor 16-1 detects a current value Im1 between main positive bus MPL and inverter 30-1. Current sensor 16-2 detects a current value Im2 between main positive bus MPL and inverter 30-2.

  Converter ECU 2 calculates current value Ib2 input / output to / from power storage device 6-2 using current values Ib1, Im1, and Im2. Converter ECU 2 uses current value Ib2 for internal control processing and outputs it to battery ECU 4.

  Voltage sensors 12-1 and 12-2 detect voltage value Vb1 of power storage device 6-1 and voltage value Vb2 of power storage device 6-2, respectively, and output the detection results to converter ECU 2 and battery ECU 4. Temperature sensors 14-1 and 14-2 detect temperature Tb1 inside power storage device 6-1 and temperature Tb2 inside power storage device 6-2, respectively, and output the detection results to battery ECU 4.

  The battery ECU 4 determines the state of charge (SOC: State) of the power storage device 6-1 based on the current value Ib1 from the current detection unit 10, the voltage value Vb1 from the voltage sensor 12-1, and the temperature Tb1 from the temperature sensor 14-1. Of charge), state quantity SOC1 is calculated, and the calculated state quantity SOC1 is output to converter ECU 2 together with temperature Tb1.

  Battery ECU 4 also provides state quantity SOC2 indicating the SOC of power storage device 6-2 based on current value Ib2 from converter ECU2, voltage value Vb2 from voltage sensor 12-2, and temperature Tb2 from temperature sensor 14-2. And the calculated state quantity SOC2 is output to converter ECU 2 together with temperature Tb2. Various known methods can be used for calculating the state quantities SOC1 and SOC2.

  Converter ECU 2 detects detected values from current detection units 10, 16 and voltage sensors 12-1, 12-2, 18, temperatures Tb 1, Tb 2 and state quantities SOC 1, SOC 2 from battery ECU 4, and torque target from drive ECU 32. Based on values TR1 and TR2 and rotation speed target values MRN1 and MRN2, drive signals PWC1 and PWC2 for driving converters 8-1, 8-2 are generated. Then, converter ECU 2 outputs the generated drive signals PWC1, PWC2 to converters 8-1, 8-2, respectively, to control converters 8-1, 8-2. The configuration of converter ECU 2 will be described in detail later.

  FIG. 2 is a schematic configuration diagram of converters 8-1, 8-2 shown in FIG. Since the configuration and operation of converter 8-2 are the same as those of converter 8-1, the configuration and operation of converter 8-1 will be described below.

  Referring to FIG. 2, converter 8-1 includes a chopper circuit 40-1, a positive bus LN1A, a negative bus LN1C, a wiring LN1B, and a smoothing capacitor C1. Chopper circuit 40-1 includes transistors Q1A and Q1B, diodes D1A and D1B, and an inductor L1.

  Positive bus LN1A has one end connected to the collector of transistor Q1B and the other end connected to main positive bus MPL. Negative bus LN1C has one end connected to negative electrode line NL1 and the other end connected to main negative bus MNL.

  Transistors Q1A and Q1B are connected in series between negative bus LN1C and positive bus LN1A. Specifically, the emitter of transistor Q1A is connected to negative bus LN1C, and the collector of transistor Q1B is connected to positive bus LN1A. Diodes D1A and D1B are connected in antiparallel to transistors Q1A and Q1B, respectively. Inductor L1 is connected to a connection point between transistor Q1A and transistor Q1B.

  Line LN1B has one end connected to positive electrode line PL1 and the other end connected to inductor L1. Smoothing capacitor C1 is connected between line LN1B and negative bus LN1C, and reduces the AC component included in the DC voltage between line LN1B and negative bus LN1C.

  Chopper circuit 40-1 receives DC power (driving power) received from positive line PL1 and negative line NL1 when power storage device 6-1 is discharged in response to drive signal PWC1 from converter ECU 2 (not shown). When the power storage device 6-1 is charged, the DC power (regenerative power) received from the main positive bus MPL and the main negative bus MNL is reduced.

  Hereinafter, the voltage conversion operation (step-up operation and step-down operation) of converter 8-1 will be described. During the boosting operation, converter ECU 2 maintains transistor Q1B in the off state, and turns on / off transistor Q1A at a predetermined duty ratio. In the on period of transistor Q1A, the discharge current flows from power storage device 6-1 to main positive bus MPL through wiring LN1B, inductor L1, diode D1B, and positive bus LN1A in this order. At the same time, a pump current flows from power storage device 6-1 through wiring LN1B, inductor L1, transistor Q1A, and negative bus LN1C in this order. The inductor L1 accumulates electromagnetic energy by this pump current. When transistor Q1A transitions from the on state to the off state, inductor L1 superimposes the accumulated electromagnetic energy on the discharge current. As a result, the average voltage of the DC power supplied from converter 8-1 to main positive bus MPL and main negative bus MNL is boosted by a voltage corresponding to the electromagnetic energy stored in inductor L1 according to the duty ratio.

  On the other hand, during the step-down operation, converter ECU 2 turns on / off transistor Q1B at a predetermined duty ratio and maintains transistor Q1A in the off state. In the on-period of transistor Q1B, the charging current flows from main positive bus MPL through positive bus LN1A, transistor Q1B, inductor L1, and wiring LN1B in this order to power storage device 6-1. When the transistor Q1B transitions from the on state to the off state, magnetic flux is generated so that the inductor L1 prevents a change in current. Therefore, the charging current continues to flow through the diode D1A, the inductor L1, and the wiring LN1B in order. On the other hand, in terms of electrical energy, since the DC power is supplied from the main positive bus MPL and the main negative bus MNL only during the ON period of the transistor Q1B, it is assumed that the charging current is kept constant (inductor). Assuming that the inductance of L1 is sufficiently large), the average voltage of the DC power supplied from converter 8-1 to power storage device 6-1 is obtained by multiplying the DC voltage between main positive bus MPL and main negative bus MNL by the duty ratio. Value.

  In order to control such a voltage conversion operation of converter 8-1, converter ECU 2 uses drive signal PWC1A for controlling on / off of transistor Q1A and drive signal PWC1B for controlling on / off of transistor Q1B. A drive signal PWC1 is generated.

  FIG. 3 is a functional block diagram of converter ECU 2 of FIG. Note that converter ECU 2 shown in FIG. 3 may be realized by hardware or software.

  Referring to FIG. 3, converter ECU 2 includes a mode / target value determination unit 50, subtraction units 52, 56, 60-1, 60-2, 64-1, 64-2, and PI control units 54, 62-. 1, 62-2, division units 58-1 and 58-2, selection units 66-1 and 66-2, modulation units (MOD) 68-1 and 68-2, and a current value calculation unit 70. Including.

  The mode / target value determination unit 50 controls the control mode (voltage control mode or current control mode) in the converter 8-1 based on the state quantities SOC1, SOC2, torque target values TR1, TR2 and rotation speed target values MRN1, MRN2. In addition, the control mode (current control mode or control stop mode) in converter 8-2 is determined. Then, the mode / target value determination unit 50 outputs mode selection commands SEL1, SEL2 to the selection units 66-1, 66-2 according to the determined modes.

  Further, the mode / target value determination unit 50 determines a voltage target value and / or a power target value according to each determined mode. Specifically, when mode / target value determination unit 50 determines the control mode of converter 8-1 to be the voltage control mode, driving force generation unit 3 based on torque target values TR1, TR2 and rotation speed target values MRN1, MRN2. The voltage target value (target value Vh *) of (FIG. 1) is determined. On the other hand, when mode / target value determining unit 50 determines the control mode of converter 8-1 to be the current control mode, power target value (to which converter 8-1 should share) among the actual power values in the range of state quantity SOC1 or less. A target value P1 *) is determined.

  Further, during the period in which converter 8-1 is controlled in the current control mode, mode / target value determination unit 50 subtracts target value P1 * from the actual power value to obtain target value P2 that is the power target value of converter 8-2. * Is determined. On the other hand, in the period in which converter 8-1 is controlled in the voltage control mode, mode / target value determination unit 50 determines target value P2 * based on state quantity SOC2.

  The target values P1 * and P2 * can be arbitrarily determined as long as they are within a range that does not exceed the limit value. Target value Vh * is output to subtraction unit 52, and target values P1 * and P2 * are output to division units 58-1 and 58-2, respectively.

  The subtraction unit 52 subtracts the voltage value Vh from the target value Vh * and outputs the calculation result to the PI control unit 54. The PI control unit 54 performs a proportional integration calculation with the deviation between the target value Vh * and the voltage value Vh as an input, and outputs the calculation result to the subtraction unit 56. That is, the PI control unit 54 is a voltage feedback (hereinafter also referred to as “FB”) compensation term using a deviation between the target value Vh * and the voltage value Vh.

  Subtraction unit 56 subtracts the output of PI control unit 54 from the inverse of the theoretical boost ratio of converter 8-1 indicated by voltage value Vb1 / target value Vh *, and selects the calculation result as duty command # Ton1 as selection unit 66- Output to 1. The input term (voltage value Vb1 / target value Vh *) in the subtracting unit 56 is a voltage feedforward (hereinafter also referred to as “FF”) compensation term based on the theoretical boost ratio of the converter 8-1.

  Division unit 58-1 calculates target value Ib1 * of power storage device 6-1 by dividing target value P1 * by voltage value Vb1, and outputs the calculation result (target value Ib1 *) to subtraction unit 60-1. To do.

  Subtraction unit 60-1 subtracts current value Ib1 from target value Ib1 * and outputs the calculation result to PI control unit 62-1. The PI control unit 62-1 performs a proportional integration calculation with the deviation between the target value Ib1 * and the current value Ib1 as an input, and outputs the calculation result to the subtraction unit 64-1.

  Subtraction unit 64-1 subtracts the output of PI control unit 62-1 from the reciprocal of the theoretical boost ratio of converter 8-1 indicated by voltage value Vb1 / target value Vh *, and the operation result is output as a duty command (current control). Mode) is output to the selection unit 66-1 as% Ton1.

  The selection unit 66-1 selects one of the duty command (voltage control mode) # Ton1 and the duty command (current control mode)% Ton1 as the duty command Ton1 according to the mode selection command SEL1, and sends it to the modulation unit 68-1. Outputs a duty command Ton1.

  The modulation unit 68-1 compares the carrier wave (carrier wave) generated by the oscillation unit (not shown) with the duty command Ton1, and generates the drive signal PWC1.

  Division unit 58-2 calculates target value Ib2 * of power storage device 6-2 by dividing target value P2 * by voltage value Vb2, and outputs the calculation result (target value Ib2 *) to subtraction unit 60-2. To do.

  Subtraction unit 60-2 subtracts current value Ib2 from target value Ib2 * and outputs the calculation result to PI control unit 62-2. The PI control unit 62-2 performs a proportional integration calculation with the deviation between the target value Ib2 * and the current value Ib2 as an input, and outputs the calculation result to the subtraction unit 64-2.

  Subtraction unit 64-2 subtracts the output of PI control unit 62-2 from the reciprocal of the theoretical boost ratio of converter 8-2 indicated by voltage value Vb2 / target value Vh *, and outputs the calculation result as a duty command (current control). Mode) Output to% selecting unit 66-2 as% Ton2.

  The selection unit 66-2 selects one of the duty command (current control mode)% Ton1 and the value “0” as the duty command Ton2 according to the mode selection command SEL2, and outputs the duty command Ton2 to the modulation unit 68-2. To do. The value “0” is used to set the duty command Ton2 to zero when the selection unit 66-2 is selected in the control stop mode.

  The modulation unit 68-2 compares the carrier wave (carrier wave) generated by the oscillation unit (not shown) with the duty command Ton2, and generates the drive signal PWC2.

  The current value calculation unit 70 calculates a current value Ib2 based on the current values Ib1, Im1, and Im2. However, since the current values Im1, Im2 are constantly changing, it is necessary to obtain the current values Ib1, Im1, Im2 in a steady state in order to calculate the current value Ib2.

  For example, the current value calculation unit 70 calculates the current Ib2 using the average value of each of the current values Ib1, Im1, and Im2 in a predetermined period (for example, 10 milliseconds or 100 milliseconds). In a steady state, the relationship of Ib2 = (Im1 + Im2) −Ib1 is established for the current values Ib1, Ib2, Im1, and Im2. The current value calculation unit 70 calculates the current value Ib2 based on the above relationship. Note that the current values Ib1, Im1, and Im2 in the following description are values in a steady state.

  FIG. 4 is a flowchart of converter control by converter ECU 2 shown in FIG. Note that the flowchart shown in FIG. 4 is executed when a predetermined condition is satisfied or for each predetermined period.

  Referring to FIGS. 4 and 3, in step S1, converter ECU 2 obtains current value Ib1. In step S2, converter ECU 2 obtains current values Im1, Im2. In step S3, converter ECU 2 (more specifically, current value calculation unit 70) calculates current value Ib2 from current values Ib1, Im1, and Im2 according to the above relationship. In step S4, converter ECU 2 generates control signals PWM1C and PWM2C based on current values Ib1 and Ib2, and controls converters 8-1 and 8-2 shown in FIG. When the process of step S4 ends, the entire process returns to step S1.

  Next, the control of converters 8-1, 8-2 shown in step S4 of FIG. 4 will be described in more detail.

FIG. 5 is a diagram illustrating a control mode of converters 8-1 and 8-2 in FIG. 1.
FIG. 5A is a schematic diagram illustrating a first control mode of converters 8-1 and 8-2.

  Referring to FIG. 5A, converters 8-1, 8-2 operate in a voltage control mode and a current control mode, respectively. Such control is executed, for example, when the vehicle is traveling.

  By managing converters 8-1 and 8-2 in the voltage control mode and the current control mode, respectively, the power input / output to / from power storage devices 6-1 and 6-2 is managed while managing the voltage of the motor generator. Can do. As a result, the motor generator can be stably operated, so that the running performance of the vehicle can be improved, for example.

FIG. 5B is a schematic diagram showing a second control mode of converters 8-1 and 8-2.
Referring to FIG. 5 (b), converters 8-1, 8-2 both operate in the current control mode. Such control is executed, for example, when charging power storage devices 6-1 and 6-2 with the vehicle stopped.

  That the vehicle is stopped means that the motor generator included in the driving force generator 3 is stopped. Therefore, it is not necessary to manage the voltage of the motor generator. By operating both converters 8-1 and 8-2 in the current control mode, the power input to power storage devices 6-1 and 6-2 can be managed. Thereby, it is possible to charge each of power storage devices 6-1 and 6-2 so that the charging amount does not become excessive or insufficient.

  5A and 5B, a relationship is obtained in which the sum of the current values Ib1 and Ib2 is substantially equal to the sum of the current values Im1 and Im2.

  As described above, in Embodiment 1, power supply device 1 mounted on vehicle 100 detects a current input / output to / from power storage device 6-1 and outputs current value Ib1. Current detection Im1 detects current value Im1 between main positive bus MPL and inverter 30-1, and current value Im2 between main positive bus MPL and inverter 30-2, and outputs current values Im1 and Im2. Unit 16 and converter ECU 2 that controls converters 8-1 and 8-2 based on current values Ib 1, Im 1, and Im 2.

  Preferably, converter ECU 2 calculates current value Ib2 input / output to / from power storage device 6-2 based on current values Ib1, Im1, and Im2. Based on current value Ib2, converter ECU 2 controls converter 6-2 such that current value Ib2 input / output to / from power storage device 6-2 becomes target value Ib2 *.

  More preferably, converter ECU 2 controls converter 8-1 so that the voltage value between main positive bus MPL and main negative bus MNL becomes target value Vh * when driving force generating unit 3 is driven. Converter ECU 2 controls converter 8-1 so that current value Ib1 of power storage device 6-1 becomes target value Ib1 * when power storage device 6-1 is charged in a state where driving force generation unit 3 is stopped.

  More preferably, current detection unit 16 outputs a result (current values Im1, Im2) of detecting a current value between main positive bus MPL and driving force generation unit 3.

  Accordingly, it is not necessary to provide a current sensor in the power storage device 6-2, so that the number of current sensors can be reduced as a whole power supply device. Accordingly, the cost of the current sensor and the cost for maintaining the reliability of the current sensor (such as detection of a failure) can be reduced.

  Note that only one current sensor for detecting the current (that is, current values Im1, Im2) flowing through both inverters 30-1, 30-2 may be provided in main positive bus MPL. In this case, the current value detected by the current sensor is equal to the sum of the current values Im1 and Im2. Therefore, the current value Ib2 can be calculated based on the detection value of the current sensor and the current value Ib1. In addition, the number of current sensors can be further reduced.

[Embodiment 2]
FIG. 6 is an overall block diagram of a vehicle according to Embodiment 2 of the present invention.

  Referring to FIGS. 6 and 1, vehicle 100 </ b> A is different from vehicle 100 in that power supply device 1 is included instead of power supply device 1.

  The power supply device 1A is different from the power supply device 1 in that it includes a main body portion 20A instead of the main body portion 20 and a current detection portion 16A instead of the current detection portion 16. Main body portion 20A is different from main body portion 20 in that it includes a current detection unit 10A instead of current detection unit 10 and a converter ECU 2A in place of converter ECU 2.

  Current detection unit 10A includes current sensors 10-1 and 10-1A. Current sensors 10-1 and 10-1A both detect a current value input / output to / from power storage device 6-1. Current sensors 10-1 and 10-1A output current values Ib1 and Ib1A, respectively.

  The current detection unit 16A includes current sensors 16-1, 16-1A, 16-2, and 16-2A. Current sensor 16-1A detects a current value between main positive bus MPL and inverter 30-1, and outputs current value Im1A. Current sensor 16-2A detects a current value between main positive bus MPL and inverter 30-2 and outputs a current value Im2A.

  Thus, in Embodiment 2, a current sensor is installed twice with respect to the power line. Thereby, the failure of the current detection unit can be detected. For example, when an abnormality occurs in one of the current sensor 10-1 and the current sensor 10-1A, a difference occurs in the current values Ib1 and Ib1A. If the difference is greater than or equal to a predetermined value, converter ECU 2A determines that failure of current detection unit 10 has occurred. Similarly, converter ECU 2A determines current detector 16A when there is a difference of a predetermined value or more between current values Im1 and Im1A, or when a difference of a predetermined value or more is generated between current values Im2 and Im2A. Is determined to have failed. When converter ECU 2A determines that a failure has occurred in either of current detection units 10A and 16A, converter ECU 2A changes the control mode of converters 8-1 and 8-2.

  FIG. 7 is a functional block diagram of converter ECU 2A of FIG. Note that converter ECU 2A shown in FIG. 7 may be implemented by hardware or software.

  Referring to FIGS. 7 and 3, converter ECU 2 </ b> A is different from converter ECU 2 in that it includes a mode / target value determination unit 50 </ b> A instead of mode / target value determination unit 50. Converter ECU 2A differs from converter ECU 2 in that it further includes subtraction units 52A and 56A, PI control unit 54A, and switching units 55-1 and 55-2.

  The switching unit 55-1 is provided between the PI control unit 54 and the subtraction unit 56. When the switching signal SW1 output from the mode / target value determination unit 50A is activated, the switching unit 55-1 outputs the calculation result of the PI control unit 54 to the subtraction unit 56. On the other hand, when the switching signal SW1 is inactivated, the switching unit 55-1 outputs the value 0 to the subtracting unit 56 instead of the calculation result of the PI control unit 54-1. That is, the switching unit 55-1 turns on the function of voltage FB control by the PI control unit 54-1 when the switching signal SW1 is activated, and performs PI control when the switching signal SW1 is deactivated. The function of the voltage FB control by the unit 54-1 is turned off.

  Subtraction unit 52A subtracts voltage value Vh from target value Vh * and outputs the calculation result to PI control unit 54A. The PI control unit 54A performs a proportional integration calculation with the deviation between the target value Vh * and the voltage value Vh as an input, and outputs the calculation result to the switching unit 55-2. That is, the PI control unit 54A is a voltage feedback compensation term using a deviation between the target value Vh * and the voltage value Vh.

  When the switching signal SW2 output from the mode / target value determination unit 50A is activated, the switching unit 55-2 outputs the calculation result of the PI control unit 54A to the subtraction unit 56A. On the other hand, when the switching signal SW1 is inactivated, the switching unit 55-1 outputs the value 0 to the subtracting unit 56A instead of the calculation result of the PI control unit 54-1. That is, the switching unit 55-2 turns on the voltage FB control function by the PI control unit 54A when the switching signal SW2 is activated, and the PI control unit 54A when the switching signal SW2 is deactivated. The function of voltage FB control by is turned off.

  Subtraction unit 56A subtracts the output of PI control unit 54A from the inverse of the theoretical boost ratio of converter 8-2 indicated by voltage value Vb2 / target value Vh *, and selects the calculation result as duty command # Ton2 as selection unit 66- Output to 2. The input term (voltage value Vb2 / target value Vh *) in subtraction unit 56A is a voltage feedforward compensation term based on the theoretical boost ratio of converter 8-2.

  The mode / target value determination unit 50A determines whether or not the current detection unit 10A shown in FIG. 6 is normal based on the input current values Ib1 and Ib1A. Further, the mode / target value determination unit 50A determines whether or not the current sensors 16-1 and 16-1A shown in FIG. 6 are both normal based on the input current values Im1 and Im1A. Further, the mode / target value determination unit 50A determines whether or not the current sensors 16-2 and 16-2A shown in FIG. 6 are both normal based on the input current values Im2 and Im2A.

  If the mode / target value determination unit 50A determines that the current detection unit 10A has failed, the mode / target value determination unit 50A deactivates the switching signal SW1 and activates the switching signal SW2. Further, the mode / target value determination unit 50A sets the mode selection command SEL1 so that the selection unit 66-1 outputs the duty command # Ton1 as the duty command Ton1, and the selection unit 66-2 sets the duty command # Ton2 to duty. The mode selection command SEL2 is set so as to be output as the command Ton2.

  The mode / target value determination unit 50A determines that a failure has occurred in the current detection unit 16A (when it is determined that one of the current sensors 16-1 and 16-1A is abnormal, or the current sensor 16-2, When it is determined that one of 16-2A is abnormal), the selection unit 66-2 sets the mode selection command SEL2 so that the duty command # Ton2 is output as the duty command Ton2.

  FIG. 8 is a flowchart of converter control by converter ECU 2A shown in FIG. The flowchart shown in FIG. 8 is executed when a predetermined condition is satisfied or for each predetermined period.

  Referring to FIGS. 8 and 7, in step S11, converter ECU 2A determines whether or not current detection unit 10A is normal. If the difference between current values Ib1 and Ib1A is less than a predetermined value, converter ECU 2A determines that current detection unit 10A is normal. On the other hand, if the difference between current values Ib1 and Ib1A is equal to or greater than a predetermined value, converter ECU 2A determines that a failure has occurred in current detection unit 10A.

  When current detection unit 10A is normal (YES in step S11), converter ECU 2A determines whether or not current detection unit 16A is normal (step S12). When the difference between current values Im1 and Im1A and the difference between current values Im2 and Im2A are both less than a predetermined value, converter ECU 2A determines that current detection unit 16A is normal. In this case (YES in step S12), converter ECU 2A controls converters 8-1 and 8-2 without changing the control mode (step S13). Thereby, for example, converters 8-1 and 8-2 operate according to the control mode shown in FIG. 5A or FIG.

  On the other hand, if at least one of the difference between current values Im1 and Im1A and the difference between current values Im2 and Im2A is equal to or greater than a predetermined value, converter ECU 2A determines that a failure has occurred in current detector 16A. In this case (NO in step S12), converter ECU 2A sets the control mode of converter 8-2 to the voltage control mode (step S14). The control mode (voltage control mode or current control mode) of converter 8-1 is not changed.

  In step S14, the mode / target value determination unit 50A sets the mode selection command SEL2 so that the selection unit 66-2 outputs the duty command # Ton2 as the duty command Ton2. If the current detector 16A fails, the current value Ib2 becomes inaccurate. However, if the control mode of converter 8-2 is set to the voltage control mode, current value Ib2 is not used when generating duty command # Ton2. Therefore, control of converter 8-2 can be continued even if current value Ib2 is inaccurate.

  On the other hand, when it is determined in step S11 that failure has occurred in current detection unit 10A (NO in step S11), converter ECU 2A performs the same process as the process in step S12 to determine whether or not current detection unit 16A is normal. (Step S15). If current detection unit 16A is normal, that is, if the difference between current values Im1 and Im1A and the difference between current values Im2 and Im2A are both less than a predetermined value (YES in step S15), converter ECU 2A causes converter 8- The control mode 1 is set to the voltage control mode (FF control), and the control mode of the converter 8-2 is set to the voltage control mode (FB control) (step S16).

  Specifically, the mode / target value determination unit 50A sets the mode selection command SEL1 so that the switching signal SW1 is deactivated and the selection unit 66-1 outputs the duty command # Ton1 as the duty command Ton1. Thereby, the control mode of converter 8-1 is set to the voltage control mode (FF control). The mode / target value determination unit 50A activates the switching signal SW2 and sets the mode selection command SEL2 so that the selection unit 66-2 outputs the duty command # Ton2 as the duty command Ton2. Thereby, the control mode of converter 8-2 is set to the voltage control mode (FB control).

  When any one of steps S13, S14, and S16 ends, the entire process returns to step S11. On the other hand, when it is determined in step S15 that a failure has occurred in current detection unit 16A (NO in step S15), converter ECU 2A executes an abnormality process such as turning on a warning lamp (step S17). When the abnormal process is executed, the entire process is terminated.

  As described above, according to the second embodiment, each of current detection units 10A and 16A includes at least two current sensors. Converter ECU 2A detects the failure of current detectors 10A and 16A by comparing the outputs of the two current sensors. When a failure in either one of current detectors 10A and 16A is detected, converter ECU 2A causes voltage (voltage value Vh) between main positive bus MPL and main negative bus MNL to be a target value Vh *. The converter 8-2 is controlled. When converter ECU 2A detects that both current detection units 10A and 16A have failed, it executes a predetermined abnormality process.

  As a result, according to the second embodiment, it is possible to reduce the number of current sensors even in the power supply device in which the current sensors are installed twice with respect to the power line. Conventionally, in the configuration shown in FIG. 6, it is necessary to install two current sensors on positive line PL2, but in Embodiment 2, it is not necessary to install a current sensor on positive line PL2. Therefore, according to the second embodiment, the number of current sensors installed in the power supply device can be greatly reduced.

[Embodiment 3]
FIG. 9 is an overall block diagram of a vehicle according to Embodiment 3 of the present invention.

  9 and 1, vehicle 100B differs from vehicle 100 in that it further includes rotational position sensors 37-1 and 37-2. The rotational position sensor 37-1 detects the rotational angle θ1 of the rotor of the motor generator 34-1. The rotational position sensor 37-2 detects the rotational angle θ2 of the rotor of the motor generator 34-2.

  Vehicle 100B is different from vehicle 100 in that power supply device 1B is included instead of power supply device 1. The power supply device 1B is different from the power supply device 1 in that it includes a main body portion 20B instead of the main body portion 20 and includes a current detection portion 17 instead of the current detection portion 16.

  The current detection unit 17 includes current sensors 17-1 and 17-2. Current sensor 17-1 detects a current value Iu1 of the u-phase coil of motor generator 34-1, and a current value Iv1 of the v-phase coil of motor generator 34-1. Current sensor 17-2 detects current value Iu2 of the u-phase coil of motor generator 34-2 and current value Iv2 of the v-phase coil of motor generator 34-1.

  The current sensors 17-1 and 17-2 are both provided in the u and v phases of the three phases of the motor generator, but the current sensors are provided in any two phases of the three phases of the motor generator. What is necessary is just to be provided.

  Main body 20B is different from main body 20 in that it includes converter ECU 2B instead of converter ECU 2. Converter ECU 2B calculates a current value (current value Im1) between main positive bus MPL and inverter 30-1 based on rotation angle θ1 and current values Iu1 and Iv1. Further, converter ECU 2B calculates a current value (current value Im2) between main positive bus MPL and inverter 30-2 based on rotation angle θ2 and current values Iu2 and Iv2. Converter ECU 2 </ b> B calculates current value Ib <b> 2 based on current values Im <b> 1 and Im <b> 2 that are calculation results and current value Ib <b> 1 from current detection unit 10.

  FIG. 10 is a functional block diagram of converter ECU 2B of FIG. Note that converter ECU 2B shown in FIG. 10 may be implemented by hardware or software.

  Referring to FIGS. 10 and 3, converter ECU 2 </ b> B is different from converter ECU 2 in that it further includes a coordinate conversion unit 72, a current value calculation unit 74, a current command calculation unit 76, and a current control unit 78.

  The coordinate conversion unit 72 calculates the w-phase current value Iw1 of the motor generator 34-1 shown in FIG. 9 from the current values Iu1 and Iv1. Then, the coordinate conversion unit 72 performs three-phase to two-phase conversion on the current values Iu1, Iv1, and Iw1 using the rotation angle θ1 to obtain a d-axis current value Id1 and a q-axis current value Iq1. Similarly, coordinate conversion unit 72 calculates w-phase current value Iw2 of motor generator 34-2 shown in FIG. 9 from current values Iu2 and Iv2. The coordinate conversion unit 72 performs three-phase to two-phase conversion on the current values Iu2, Iv2, and Iw2 using the rotation angle θ2, and obtains a d-axis current value Id2 and a q-axis current value Iq2.

The current command calculation unit 76 obtains a q-axis current command value Iq1 ^* corresponding to the torque target value TR1, and obtains a d-axis current command value Id1 ^* based on the q-axis current command value Iq1 ^* . Similarly, the current command calculation unit 76 calculates a q-axis current command value Iq2 ^* corresponding to the torque target value TR2, and calculates a d-axis current command value Id2 ^* based on the q-axis current command value Iq2 ^* .

The current control unit 78 performs a proportional-integral calculation on a deviation between the q-axis current command value Iq1 ^* and the d-axis current command value Id1 ^* and the q-axis current value Iq1 and the d-axis current value Id1 output from the coordinate conversion unit 72. Thus, the q-axis voltage command value Vq1 and the d-axis voltage command value Vd1 are obtained. Similarly, the current control unit 78 proportionally integrates the deviation between the q-axis current command value Iq2 ^* and the d-axis current command value Id2 ^* and the q-axis current value Iq2 and the d-axis current value Id2 output from the coordinate conversion unit 72. By calculating, q-axis voltage command value Vq2 and d-axis voltage command value Vd2 are obtained.

  The current value calculator 74 calculates the d-axis current values Id1, Id2, the q-axis current values Iq1, Iq2, the d-axis voltage command values Vd1, Vd2, the q-axis voltage command values Vq1, Vq2, and the voltage value Vh. In response, current values Im1 and Im2 are calculated according to the following equations (1) and (2). In the following formulas (1) and (2), sqrt represents a square root.

Im1 = sqrt {(Id1) ² + (Iq1) ² } × sqrt {(Vd1) ² + (Vq1) ² } / Vh (1)
Im2 = sqrt {(Id2) ² + (Iq2) ² } × sqrt {(Vd2) ² + (Vq2) ² } / Vh (2)
Similar to the first embodiment, the current value calculation unit 70 calculates the current value Ib2 from the relationship of Ib2 = (Im1 + Im2) −Ib1.

  FIG. 11 is a flowchart of converter control by converter ECU 2B shown in FIG. The flowchart shown in FIG. 11 is executed when a predetermined condition is satisfied or every predetermined period.

  Referring to FIGS. 11 and 4, the flowchart shown in FIG. 11 is different in that the process of step S2A is included instead of the process of step S2 in the flowchart shown in FIG. In step S2A, converter ECU 2B shown in FIG. 10 calculates current values Im1 and Im2 according to the above-described equations (1) and (2). The processing of other steps in the flowchart shown in FIG. 11 is the same as the processing of the corresponding steps in the flowchart shown in FIG.

  Thus, according to the third embodiment, converter ECU 2B has an AC voltage (d-axis voltage command value and q-axis voltage command value) of the motor generator and a detection result (AC current flowing in the motor generator) by current detector 17. And the detected voltage (voltage value Vh) from voltage sensor 18, current value Im1 between main positive bus MPL and inverter 3-1 and current between main positive bus MPL and inverter 3-2. The value Im2 is calculated. Converter ECU 2B calculates current value Ib2 input / output to / from power storage device 8-2 using current values Im1, Im2 and current value Ib1 detected by current detection unit 10. As a result, it is not necessary to provide a current sensor on main positive bus MPL or main negative bus MNL, so the number of current sensors can be reduced as in the first embodiment.

  In the above description, it is assumed that the current detection unit 10 is installed in the power storage device 6-1 among the power storage devices 6-1 and 6-2. FIG. 12 shows a method for identifying the power storage device that is the installation target of the current detection unit among the two power storage devices.

FIG. 12 is a diagram illustrating a method for specifying a power storage device to be installed in the current detection unit 10.
FIG. 12A is a diagram illustrating an example of a method for specifying a power storage device that is an installation target of the current detection unit 10.

  12A, when voltage value Vb1 of power storage device 6-1 is smaller than voltage value Vb2 of power storage device 6-2, current detection unit 10 is installed on the power storage device 6-1 side. By realizing the management of the voltage value Vh by the control of the converter 8-2, the converter 8-1 can be stopped. Thereby, the loss in converter 8-1 can be reduced.

  Further, when the capacity value of power storage device 6-1 is smaller than the capacity value of power storage device 6-2, current detection unit 10 is installed on the power storage device 6-1 side. In this case, power storage device 6-2 serves as a smoothing capacitor by managing voltage value Vh by controlling converter 8-2. As a result, the voltage value Vh can be smoothed even if the capacity of the smoothing capacitor C shown in FIG. Therefore, it is possible to use a capacitor having a smaller capacitance value than that of the conventional one, so that the cost of the power supply device can be reduced.

  In any of the two cases described above, the power storage device 6-2 supplies power for driving the motor generator included in the driving force generation unit 3. In this case, since converter 8-2 is driven in the voltage control mode, converter 8-2 can be controlled without measuring the value of the current flowing through power storage device 6-2. For this reason, the electric current detection part 10 is installed in the electrical storage apparatus 6-1 side.

  FIG. 12B is a diagram illustrating another example of a method for identifying a power storage device that is an installation target of the current detection unit 10.

  Referring to FIG. 12B, auxiliary machinery 7 is provided as another load device different from driving force generating unit 3 between power storage device 6-1 and converter 8-1. Note that the power storage device 6-1 and the power storage device 6-2 have the same voltage value and capacitance value. In such a case, the current detection unit 10 is installed in the power storage device in which the auxiliary machinery 7 (for example, a DC / DC converter) is installed out of the two power storage devices. In such a configuration, in order to ensure the power supplied to the auxiliary machinery 7, it is preferable to detect the current flowing through the power storage device 6-1 and control the power of the power storage device 6-1. Therefore, the current detection unit 10 is installed on the power storage device 6-1 side.

[Embodiment 4]
FIG. 13 is an overall block diagram of a vehicle according to Embodiment 4 of the present invention.

  Referring to FIGS. 13 and 9, vehicle 100 </ b> C is different from vehicle 100 in that power supply device 1 </ b> C is included instead of power supply device 1 </ b> B. The power supply device 1C is different from the power supply device 1B in that it includes a main body portion 20C instead of the main body portion 20B.

  Main unit 20C is different from main unit 20B in that it has only one power storage device. The difference between the main body 20C and the main body 20B will be described in more detail. The power storage device 6-2, the converter 8-2, the voltage sensor 12-2, and the temperature sensor 14- included in the main body 20B. 2, the positive electrode line PL2, and the negative electrode line NL2 are not included in the main body portion 20C. Main body portion 20C is different from main body portion 20B in that it includes converter ECU 2C instead of converter ECU 2B. Furthermore, the main body portion 20C is different from the main body portion 20B in that the current detection portion 10 is not included.

  Similarly to converter ECU 2B, converter ECU 2C calculates a current value (current value Im1) between main positive bus MPL and inverter 30-1 based on rotation angle θ1 and current values Iu1 and Iv1. Further, converter ECU 2C calculates a current value (current value Im2) between main positive bus MPL and inverter 30-2 based on rotation angle θ2 and current values Iu2 and Iv2. Converter ECU 2C calculates the sum of current values Im1 and Im2, and estimates that the calculation result is equal to the current value input to and output from power storage device 6-1.

  FIG. 14 is a functional block diagram of converter ECU 2C of FIG. Note that converter ECU 2C shown in FIG. 14 may be realized by hardware or software.

  Referring to FIGS. 14 and 10, the configuration of converter ECU 2C is the same as the configuration of converter ECU 2B. However, in converter ECU 2C, current value calculation unit 70 adds current values Im1 and Im2 to generate current value Ib1. In this respect, converter ECU 2C is different from converter ECU 2B.

  FIG. 15 is a flowchart of converter control by converter ECU 2C shown in FIG. The flowchart shown in FIG. 15 is executed when a predetermined condition is satisfied or every predetermined period.

  Referring to FIGS. 15 and 14, in step S21, converter ECU 2C calculates current values Im1 and Im2. In step S22, converter ECU 2C calculates current value Ib1 based on current values Im1 and Im2. In step S23, converter ECU 2C controls converter 8-1 based on current value Ib1 and the like. When the process of step S23 ends, the entire process ends.

  As described above, according to the fourth embodiment, in the power supply device provided with only one power storage device, converter ECU 2C detects the AC voltage of the motor generator, the detection result by current detection unit 17, and the detection from voltage sensor 18. Using the voltage, current value Im1 between main positive bus MPL and inverter 3-1 and current value Im2 between main positive bus MPL and inverter 3-2 are calculated. Converter ECU 2C controls converter 8-1 using current values Im1 and Im2. This eliminates the need to provide a current sensor in the power storage device, so that the number of current sensors can be reduced as in the first embodiment.

  In the present embodiment, an example is shown in which the present invention is applied to a series / parallel type hybrid system in which the power of the engine can be divided and transmitted to the axle and the generator by the power split mechanism. However, the present invention is applied to a series type hybrid vehicle in which an engine is used only for driving a generator and an axle driving force is generated only by a motor that uses electric power generated by the generator, or an electric vehicle that runs only by a motor. Is also applicable.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 is an overall block diagram of a vehicle according to a first embodiment of the present invention. FIG. 2 is a schematic configuration diagram of converters 8-1 and 8-2 shown in FIG. 1. It is a functional block diagram of converter ECU2 of FIG. It is a flowchart of converter control by converter ECU2 shown in FIG. It is a figure explaining the control aspect of the converters 8-1 and 8-2 of FIG. It is a whole block diagram of the vehicle by Embodiment 2 of this invention. It is a functional block diagram of converter ECU2A of FIG. It is a flowchart of converter control by converter ECU2A shown in FIG. It is a whole block diagram of the vehicle by Embodiment 3 of this invention. FIG. 10 is a functional block diagram of converter ECU 2 </ b> B of FIG. 9. It is a flowchart of converter control by converter ECU2B shown in FIG. 3 is a diagram illustrating a method for specifying a power storage device that is a target for installation of the current detection unit 10. It is a whole block diagram of the vehicle by Embodiment 4 of this invention. It is a functional block diagram of converter ECU2C of FIG. It is a flowchart of converter control by converter ECU2C shown in FIG.

Explanation of symbols

  1, 1A to 1C power supply device, 2, 2A to 2C converter ECU, 3 driving force generator, 4 battery ECU, 6-1, 6-2 power storage device, 7 accessories, 8-1, 8-2 converter, 10, 10A, 16, 16A, 17 Current detection unit, 12-1, 12-2 Voltage sensor, 14-1, 14-2 Temperature sensor, 10-1, 10-1A, 16-1, 16-1, 16 -1A, 16-2, 16-2A, 17-1, 17-2 Current sensor, 18 Voltage sensor, 20, 20A to 20C Main body, 30-1, 30-2 Inverter, 34-1, 34-2 Motor Generator, 32 drive ECU, 36 power transmission mechanism, 37-1, 37-2 rotational position sensor, 38 drive shaft, 40-1, 40-2 chopper circuit, 50, 50A mode / target value determination unit, 52, 56, 60-1,6 -2, 64-1, 64-2 Subtraction unit, 54, 54A, 62-1, 62-2 PI control unit, 55-1, 55-2 switching unit, 58-1, 58-2 Division unit, 66- 1, 66-2 selector, 68-1, 68-2 modulator, 70, 74 current value calculator, 72 coordinate converter, 76 current command calculator, 78 current controller, 100, 100A to 100C vehicle, C , C1 smoothing capacitor, D1A, D1B diode, L1 inductor, LN1A positive bus, LN1B wiring, LN1C negative bus, MNL main negative bus, MPL main positive bus, NL1, NL2 negative line, PL1, PL2 positive line, Q1A, Q1B transistor .

Claims (8)

A power supply device capable of supplying power to a load device,
First and second power storage devices;
A power line configured to be able to transfer power between the power supply device and the load device;
A first converter provided between the first power storage device and the power line and performing voltage conversion between the first power storage device and the power line;
A second converter provided between the second power storage device and the power line, and performing voltage conversion between the second power storage device and the power line;
A first current detector that detects a current input to and output from the first power storage device and outputs a first detection result;
A second current detector that detects a current flowing through the load device and outputs a second detection result;
A control device for controlling the first and second converters based on the first and second detection results ;
Each of the first and second current detection units includes:
Including at least first and second current sensors;
The control device calculates a current value input / output to / from the second power storage device from the first and second detection results, and based on the calculation result, calculates the current value for the second power storage device. Controlling the second converter so that the input / output current value becomes the first current target value;
The control device performs failure detection by comparing outputs of the first and second current sensors with respect to the first and second current detection units, respectively, and the first and second current detection units. If any one of the failures is detected, the second converter is controlled so that the voltage value of the power line becomes the voltage target value, and both the first and second current detection units have failed. A power supply device that executes predetermined abnormality processing when it is detected. When the load device is driven, the control device controls the first converter so that the voltage value of the power line becomes a voltage target value, and charges the first power storage device with the load device stopped. when, the current value of the first power storage device to control said first converter such that the second target current value, the power supply device according to claim 1. The power supply device according to claim 1 , wherein the second current detection unit outputs a result of detecting a current value between the power line and the load device as the second detection result. The load device is:
An inverter connected to the power line;
Including a three-phase AC rotating electric machine driven by the inverter,
The second current detection unit outputs a result of detecting an alternating current flowing through the three-phase AC rotating electric machine as the second detection result,
The power supply device
A voltage sensor for detecting a voltage of the power line;
The control device calculates a current value between the power line and the inverter using an AC voltage of the three-phase AC rotating electric machine, the second detection result, and a detection voltage from the voltage sensor. using the calculated current value and the first detection result to calculate a current value to be input to and output from the second power storage device, a power supply device according to claim 1.   The power supply device according to claim 1, wherein a voltage value of the first power storage device is smaller than a voltage value of the second power storage device.   The power supply device according to claim 1, wherein a capacity value of the first power storage device is smaller than a capacity value of the second power storage device.   The power supply device according to claim 1, wherein another load device different from the load device is connected to the first power storage device. A vehicle provided with the power supply device of any one of Claim 1 to 7 .

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