Electric vehicles

Abstract

The electric vehicle includes an electric motor and a storage battery, travels while using as a motive power source the electric motor driven by electric power supplied from the storage battery, and charges the storage battery by means of regenerative electric power generated by the electric motor during regenerative braking. This electric vehicle is provided with an electric power converter, a bidirectional electric power conversion device, and a regenerative brake circuit. The electric vehicle is configured such that a first operation voltage for starting an electric power processing operation of the regenerative brake circuit is larger than a second operation voltage for starting charging electric power control of the bidirectional electric power conversion device.

Description

[Technical Field]

[0001] The present invention relates to an electric vehicle. [Background Art]

[0002] The electric vehicle in Patent Document 1 includes an engine, a generator, a power converter, an electric motor, and a power processing unit. The power processing unit is a device that converts regenerative energy (electrical energy) from the electric motor (induction machine) into heat for consumption, and can obtain a desired regenerative braking force through power consumption control. [Prior Art] [Patent Literature]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2020-124001 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] The inventors of the present application have studied an electric vehicle including a storage battery that stores electric power for driving a motor, and a regenerative braking circuit. In this electric vehicle, charging power control of the storage battery is performed during regenerative operation. When the regenerative power is greater than the chargeable power of the storage battery, the surplus power is consumed by the regenerative braking circuit.

[0005] In an electric vehicle (e.g., an electric dump truck), since the vehicle travels on uneven terrain, the regenerative power is not constant due to road surface disturbances. In addition, the chargeable power of the storage battery is also not constant because it depends on the SOC (State Of Charge). Therefore, if the regenerative power is not properly distributed between the charging power of the storage battery and the power consumption of the regenerative braking circuit, the DC bus voltage may become unstable.

[0006] The present invention has been made to solve the above problem. That is, one object of the present invention is to provide an electric vehicle that can reduce the possibility that the DC bus voltage becomes unstable. [Means for solving the problem]

[0007] To solve the above problems, the present invention provides an electric vehicle equipped with an electric motor and a storage battery, which runs using the electric motor driven by power supplied from the storage battery as a power source, and which is capable of charging the storage battery with regenerative power generated by the electric motor during regenerative braking, which is capable of converting input DC power into AC power and outputting it to the electric motor, and a power converter capable of converting the regenerative power input by the electric motor into DC power and outputting it, and a power converter connected to the power converter that takes DC power from the storage battery and converts the voltage, and converts The system includes a bidirectional power converter capable of operating in either a state in which it outputs the DC power of a given voltage to the power converter, or a state in which it receives the DC power from the power converter, converts the voltage, and performs charging power control by outputting the DC power of the converted voltage to the storage battery, and a regenerative brake circuit that performs power processing operations to store or consume the DC power input from the power converter, wherein the first operating voltage at which the regenerative brake circuit starts the power processing operations is greater than the second operating voltage at which the bidirectional power converter starts the charging power control. [Effects of the Invention]

[0008] According to the present invention, the possibility of the DC bus voltage becoming unstable can be reduced. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a block diagram showing an example of the internal structure of a dump truck. [Figure 2A] Figure 2A is a graph showing examples of changes in regenerative power, charging power, power consumption of the regenerative braking circuit, and DC bus voltage. [Figure 2B] Figure 2B is a graph showing examples of changes in regenerative power, charging power, power consumption of the regenerative braking circuit, and DC bus voltage. [Figure 3A]Figure 3A is a graph showing examples of changes in regenerative power, charging power, power consumption of the regenerative braking circuit, and DC bus voltage. [Figure 3B] Figure 3B is a graph showing examples of changes in regenerative power, charging power, power consumption of the regenerative braking circuit, and DC bus voltage. [Figure 4] Figure 4 is a graph showing examples of changes in regenerative power, charging power, power consumption of the regenerative braking circuit, and DC bus voltage. [Figure 5] Figure 5 is a flowchart showing the processing flow performed by the control unit of a dump truck. [Modes for carrying out the invention]

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings of the embodiments, the same or corresponding parts may be denoted by the same reference numerals. <<First Embodiment>> A dump truck 1, which is an example of an electric vehicle according to the first embodiment of the present invention, will be described. Figure 1 is a block diagram showing an example of the internal configuration of the dump truck 1. As shown in Figure 1, the dump truck 1 includes a storage battery 2 as a power source, a bidirectional power converter 3 connected to the storage battery 2, an electric motor 4, a DC reactor 5, a voltage detector 6, a DC bus capacitor 7, a power converter 8, a gear 9, wheels 10, a regenerative braking circuit 11, a control device 12, a voltage command switching command unit 13, and a DC bus current sensor 14.

[0011] Dump truck 1 is an electric dump truck, which is an electric vehicle that runs on an electric motor 4 powered by electricity supplied from a storage battery 2.

[0012] Battery 2 is a battery module that includes a battery pack composed of multiple rechargeable secondary batteries.

[0013] The bidirectional power converter 3 is connected to the storage battery 2. The bidirectional power converter 3 is connected to the power converter 8 via a power line. The bidirectional power converter 3 is controlled by the control device 12.

[0014] The bidirectional power converter 3 is, for example, a bidirectional DC-DC converter (bidirectional chopper). When the dump truck 1 is driven using the power of the storage battery 2, the bidirectional power converter 3 converts the DC power input from the storage battery 2 into a voltage conforming to a voltage command, and outputs the converted voltage. When performing a charging operation (charging power control) for the storage battery 2, the bidirectional power converter 3 converts the DC power input from the power converter 8 into a voltage conforming to a voltage command and outputs the converted voltage to the storage battery 2.

[0015] The DC reactor smoothes current. The voltage detector 6 is connected to both terminals of the bidirectional power converter 3. When the voltage detector 6 detects a DC voltage (DC bus voltage), the detected DC voltage value is transmitted to the control device 12.

[0016] The DC bus capacitor 7 is connected in parallel to the bidirectional power converter 3. The DC bus capacitor 7 charges and smoothes the DC voltage supplied from the bidirectional power converter 3.

[0017] The power converter 8 is connected in parallel to the DC bus capacitor 7, and converts the smoothed DC power output from the DC bus capacitor 7 into AC power.

[0018] The electric motor 4 is driven by the AC power output from the power converter 8, and drives the gear 9. The wheels 10 are driven by the electric motor 4 via the gear 9. Accordingly, the dump truck 1 travels. Note that the electric motor 4 operates as a generator during regenerative braking.

[0019] The DC bus current sensor 14 is connected between one terminal of the bidirectional power converter 3 and the connection point P1. The DC bus current sensor 14 outputs, to the control device 12, a DC current value input to the bidirectional power converter 3 that is detected between the bidirectional power converter 3 and the connection point P1.

[0020] The regenerative brake circuit 11 includes a step-down chopper 15 and a brake resistor 16. The regenerative brake circuit 11 converts electric power into thermal energy and consumes the energy via the brake resistor 16. The step-down chopper 15 is capable of controlling power consumption or current of the brake resistor 16 (voltage applied to the brake resistor 16). The step-down chopper 15 operates in accordance with instructions from the control device 12, and performs a power consumption operation in which current is passed through the brake resistor 16 to consume power. For convenience, the power consumption operation of the regenerative brake circuit 11 may also be referred to as a "power processing operation".

[0021] The control device 12 receives a DC current value from the DC bus current sensor 14 and receives a DC voltage value from the voltage detector 6.

[0022] The control device 12 controls the bidirectional power converter 3 and the regenerative brake circuit 11. The control device 12 is, for example, an ECU (Electronic Control Unit). An ECU is a control unit (Electronic Control Unit) that includes a microcomputer as its main component, and is also referred to as a controller. The microcomputer includes a CPU, ROM, RAM, an interface (I / F), and the like. The CPU realizes various functions by executing instructions (programs, routines) stored in the ROM. The control device 12 may also be partially or entirely configured by hardware. For example, the control device 12 may use an FPGA (Field Programmable Gate Array) or the like to realize at least part of the various functions of the control device 12.

[0023] The voltage command switching command unit 13 instructs the control device 12 to switch the operation of the bidirectional power converter 3. The voltage command switching command unit 13 is configured of, for example, an ECU.

[0024] The basic operation of the dump truck 1 will be described. <During Power Running> During operation, the dump truck 1 discharges the battery 2 via the bidirectional power converter 3 and uses the power from the battery 2 supplied via the power converter 8 to drive the electric motor 4 and propel itself. Specifically, the dump truck 1 outputs DC power from the battery 2 via the bidirectional power converter 3. The DC power output by the bidirectional power converter 3 is smoothed by the DC bus capacitor 7 and converted into AC power by the power converter 8. This AC power is output to the electric motor 4. The electric motor 4, which is connected to the power converter 8, is connected to the wheels 10 via the gear 9. When the electric motor 4 drives the gear 9, the wheels 10 rotate, causing the dump truck 1 to move forward or backward or accelerate. <During regenerative braking> The dump truck 1 is braked by regenerative braking, which generates a desired braking force by converting kinetic energy into electrical energy using the electric motor 4 as a generator, in response to commands from an ECU (not shown) for controlling the electric motor. The dump truck 1 performs regenerative braking in response to commands from the ECU based on the driver's operation of an auxiliary brake (retard brake) control device (not shown).

[0025] The power generated by the electric motor 4 through regenerative braking is called "regenerative power." The regenerative power is input to the power converter 8, where it is converted from AC power to DC power and output. The regenerative power is used to supply power to the battery 2 and is consumed by the regenerative braking circuit 11 as needed. The dump truck 1 charges the battery 2 with regenerative power using the bidirectional power converter 3. The dump truck 1 consumes any surplus regenerative power that exceeds the rechargeable power through the regenerative braking circuit 11. <Summary of the Invention> The outline of the present invention will now be described. Because the dump truck 1 travels on uneven terrain and on slopes of various inclines, the regenerative power is constantly changing. Also, since the rechargeable power of the battery 2 depends on the State of Charge (SOC), the rechargeable power is also constantly changing. In a system in which the regenerative power and rechargeable power are constantly changing, it is necessary to optimally distribute the regenerative power of the electric motor 4 to the charging power of the battery 2 and the power consumption of the regenerative brake circuit 11, and to stably control the DC bus voltage.

[0026] Therefore, in the dump truck 1 according to the first embodiment, the operating voltage at which the bidirectional power converter 3 starts charging operation (control of the charging power of the storage battery 2) and the operating voltage at which the regenerative braking circuit 11 starts power consumption operation are separated. Specifically, in the dump truck 1, the operating voltage of the regenerative braking circuit 11 is set higher than the operating voltage of the bidirectional power converter 3. The operating voltage of the regenerative braking circuit 11 may also be referred to as the "first operating voltage" for convenience. The operating voltage at which the bidirectional power converter 3 starts charging operation may also be referred to as the "second operating voltage" for convenience. Furthermore, the operating voltage at which the bidirectional power converter 3 starts charging operation may also be referred to as the "charging power control operating voltage".

[0027] As a result, when the regenerative power is less than the rechargeable power of the battery 2, the charging power control of the bidirectional power converter 3 can stably control the DC bus voltage without causing fluctuations.

[0028] On the other hand, if the regenerated power is greater than the rechargeable power of the battery 2, excess power will be generated. This excess power is stored in the DC bus capacitor 7, causing the DC bus voltage to rise. When the DC bus voltage reaches the operating voltage of the regenerative braking circuit 11, the regenerative braking circuit 11 operates, consuming the excess power and suppressing the rise in the DC bus voltage.

[0029] Furthermore, as will be described later, the dump truck 1 according to the embodiment can stably control the DC bus voltage even when the regenerative power drops sharply while the regenerative brake circuit 11 is operating and consuming excess power. The dump truck 1 according to the first embodiment can increase the power consumption of the regenerative brake circuit 11 and stably control the DC bus voltage when the rechargeable power drops sharply. Thus, the dump truck 1 according to the first embodiment can stably control the DC bus voltage.

[0030] The effects and advantages of the present invention will be explained in more detail below. Figure 2A is a graph showing an example of the changes in regenerative power, charging power, power consumption of the regenerative braking circuit 11, and DC bus voltage when the operating voltage of the regenerative braking circuit 11 and the charging power control operating voltage are the same.

[0031] When the retard is initiated at time t1 while dump truck 1 is in motion, regenerative braking force is generated, and at the same time, regenerative power is generated by electric motor 4.

[0032] During the period from time t1 to the time immediately preceding time t2, the regenerative power increases. At time t2, when the regenerative power exceeds the rechargeable power (the maximum power that can be input to the battery 2), the regenerative braking circuit 11 is activated.

[0033] From time t2, dump truck 1 distributes the rechargeable portion of the regenerated power to battery 2, charges battery 2, and consumes the regenerated power exceeding the rechargeable portion in the regenerative braking circuit 11.

[0034] At time t3, a phenomenon occurs where the regenerative power decreases sharply. In this case, the regenerative power is not properly distributed between the power used to charge the battery 2 and the power consumed by the regenerative braking circuit 11. As a result, the battery is charged and consumed in excess of the regenerative power, causing the DC bus voltage to drop.

[0035] Figure 2B is a graph showing another example of the changes in regenerative power, charging power, power consumption of the regenerative braking circuit 11, and DC bus voltage when the operating voltage of the regenerative braking circuit 11 and the charging power control operating voltage are the same.

[0036] When the retard is initiated at time t1 while dump truck 1 is in motion, regenerative braking force is generated, and at the same time, regenerative power is generated from electric motor 4.

[0037] During the period from time t1 to the time immediately preceding time t2, the regenerative power increases. At time t2, when the regenerative power exceeds the rechargeable power (the maximum power that can be input to the battery 2), the regenerative braking circuit 11 is activated.

[0038] From time t2, dump truck 1 distributes the rechargeable portion of the regenerated power to battery 2, charges battery 2, and consumes the regenerated power exceeding the rechargeable portion in the regenerative braking circuit 11.

[0039] At time t3, when the State of Charge (SOC) reaches a predetermined value, the available power for charging decreases rapidly. In this case, the DC bus voltage rises because the regenerative power cannot be properly distributed and consumed.

[0040] Figure 3A is a graph showing an example of the changes in regenerative power, charging power, power consumption of the regenerative braking circuit 11, and DC bus voltage when the operating voltage of the regenerative braking circuit 11 is greater than the charging power control operating voltage.

[0041] When the retard is initiated at time t1 while dump truck 1 is in motion, regenerative braking force is generated, and at the same time, regenerative power is generated from electric motor 4.

[0042] During the period from time t1 to the time immediately preceding time t2, if regenerative power is generated, the DC bus voltage reaches the charging power control operating voltage, so the bidirectional power converter 3 starts charging the battery 2, and as the regenerative power increases, the charging power of the battery 2 also increases.

[0043] When the regenerative power exceeds the rechargeable power (the maximum power that can be input to the battery 2) at time t2, the DC bus voltage rises and, when it reaches the operating voltage of the regenerative brake circuit 11, the regenerative brake circuit 11 activates. The regenerative brake circuit 11 begins its power consumption operation, and the power consumption in the regenerative brake circuit 11 increases and stabilizes. When the regenerative brake circuit 11 begins its power consumption operation, the dump truck 1 distributes the rechargeable portion of the regenerative power to the battery 2 to charge the battery 2, and consumes the regenerative power exceeding the rechargeable power in the regenerative brake circuit 11.

[0044] At time t3, a sharp decrease in regenerative power occurs. At this time, the operating voltage of the regenerative brake circuit 11 becomes lower than the DC bus voltage, so the power consumption operation of the regenerative brake circuit 11 stops, and the power consumption of the regenerative brake circuit 11 is suppressed. As a result, the DC bus voltage decreases gradually, and once it drops to the charging power control operating voltage, it becomes constant and stabilizes.

[0045] According to Figure 3A, in the embodiment, the dump truck 1 can stably control the DC bus voltage by suppressing power consumption in the regenerative braking circuit 11 when the regenerative power decreases rapidly.

[0046] Figure 3B is a graph showing another example of the changes in regenerative power, charging power, power consumption of the regenerative braking circuit 11, and DC bus voltage when the operating voltage of the regenerative braking circuit 11 is greater than the charging power control operating voltage.

[0047] When the retard is initiated at time t1 while dump truck 1 is in motion, regenerative braking force is generated, and at the same time, regenerative power is generated from electric motor 4.

[0048] During the period from time t1 to the time immediately preceding time t2, if regenerative power is generated, the DC bus voltage reaches the charging power control operating voltage, so the bidirectional power converter 3 starts charging the battery 2, and as the regenerative power increases, the charging power of the battery 2 also increases.

[0049] When the regenerative power exceeds the rechargeable power (the maximum power that can be input to the battery 2) at time t2, the DC bus voltage rises and, when it reaches the operating voltage of the regenerative brake circuit 11, the regenerative brake circuit 11 activates. The regenerative brake circuit 11 begins its power consumption operation, and the power consumption in the regenerative brake circuit 11 increases and stabilizes. When the regenerative brake circuit 11 begins its power consumption operation, the dump truck 1 distributes the rechargeable portion of the regenerative power to the battery 2 to charge the battery 2, and consumes the regenerative power exceeding the rechargeable power in the regenerative brake circuit 11.

[0050] At time t3, when the State of Charge (SOC) of battery 2 reaches a predetermined value, the rechargeable power decreases rapidly. In this case, the power consumption of the regenerative braking circuit 11 increases accordingly, so the linear bus voltage is controlled to remain constant.

[0051] According to Figure 3B, in the embodiment, even if the rechargeable power of the dump truck 1 decreases rapidly, the power consumption of the regenerative braking circuit 11 increases accordingly, and the DC bus voltage is controlled to remain constant. <Effects> As described above, the dump truck 1 according to the first embodiment of the present invention appropriately distributes regenerative power to power for charging and power for the regenerative braking circuit 11, thereby enabling stable control of the DC bus voltage. <<Second Embodiment>> A dump truck 1 according to a second embodiment of the present invention will now be described. The dump truck 1 according to the second embodiment differs from the dump truck 1 according to the first embodiment only in the following respects. The potential difference between the bidirectional power converter 3 and the DC current is calculated by detecting / estimating the DC current, and the operating voltage of the regenerative braking circuit 11 is corrected according to the potential difference. This allows for stable control of the DC bus voltage.

[0052] The following explanation will focus on these differences.

[0053] Even when the operating voltage of the bidirectional power converter 3 and the operating voltage of the regenerative braking circuit 11 are separated, a potential difference may occur between the bidirectional power converter 3 and the regenerative braking circuit 11 due to the influence of the impedance implemented in the DC bus.

[0054] In this case, by detecting / estimating the DC current, the potential difference between the bidirectional power converter 3 and the regenerative braking circuit 11 is calculated, and the operating voltage of the regenerative braking circuit 11 is corrected according to the potential difference, thereby achieving more stable control of the DC bus voltage.

[0055] Figure 4 is a graph showing an example of the changes in regenerative power, charging power, power consumption of the regenerative brake circuit 11, and DC bus voltage when the operating voltage of the regenerative brake circuit 11 is made greater than the charging power control operating voltage, and the potential difference between it and the bidirectional power converter 3 is calculated by detecting / estimating the DC current, and the operating voltage of the regenerative brake circuit 11 is corrected according to the potential difference.

[0056] As shown in Figure 4, when the retard is initiated at time t1 while the dump truck 1 is in motion, regenerative braking force is generated, and at the same time, regenerative power is generated from the electric motor 4.

[0057] During the period from time t1 to the time immediately preceding time t2, when regenerative power is generated, the DC bus voltage reaches the charging power control operating voltage, so the bidirectional power converter 3 starts charging the battery 2, and as the regenerative power increases, the charging power of the battery 2 also increases. During this period, the potential difference between the bidirectional power converter 3 and the regenerative brake circuit 11 is calculated by detecting / estimating the DC current, and the operating voltage of the regenerative brake circuit 11 is corrected (added) according to the potential difference. Therefore, the operating voltage of the regenerative brake circuit 11 increases from time t1.

[0058] When the regenerative power exceeds the rechargeable power (the maximum power that can be input to the battery 2) at time t2, the DC bus voltage rises and, when it reaches the operating voltage of the regenerative brake circuit 11, the regenerative brake circuit 11 activates. The regenerative brake circuit 11 begins its power consumption operation, and the power consumption in the regenerative brake circuit 11 increases and stabilizes. When the regenerative brake circuit 11 begins its power consumption operation, the dump truck 1 distributes the rechargeable portion of the regenerative power to the battery 2 to charge the battery 2, and consumes the regenerative power exceeding the rechargeable power in the regenerative brake circuit 11.

[0059] At time t3, when the regenerative power decreases and the State of Charge (SOC) reaches a predetermined value, the rechargeable power decreases rapidly, and the potential difference also decreases. In this case, the operating voltage of the regenerative braking circuit 11 decreases, so the regenerative braking circuit 11 operates, and the DC bus voltage decreases steadily.

[0060] According to the dump truck 1 of the second embodiment, the DC bus voltage can be controlled more stably between the operating voltage of the regenerative braking circuit 11 and the operating voltage of the charging power control. <Specific operation> The specific operation of the dump truck 1 according to the second embodiment will now be described. Figure 5 is a flowchart showing the processing flow executed by the control device 12 of the dump truck 1.

[0061] The control device 12 starts processing from step 500 in Figure 5 and proceeds to step 505 to determine whether or not the storage battery 2 is being charged.

[0062] If the battery 2 is not being charged, the control device 12 determines "NO" in step 505 and executes the process in step 705 again. If the battery 2 is being charged, the control device 12 determines "YES" in step 505 and executes the processes in steps 510 to 520 described below in order.

[0063] Step 510: The control device 12 calculates (estimates) the potential difference between the bidirectional power converter 3 and the regenerative braking circuit 11 according to the value detected by the DC bus current sensor. For example, the control device 12 calculates the potential difference by referring to a map that defines the relationship between current and potential difference. The potential difference is calculated (estimated) so that the potential difference increases as the current increases.

[0064] Step 515: The control device 12 adds a potential difference to a predetermined reference operating voltage of the regenerative braking circuit 11. The predetermined reference operating voltage is set to be greater than, for example, the charging power control operating voltage.

[0065] Step 520: The control device 12 sets the voltage obtained by adding a potential difference to a predetermined reference operating voltage to the operating voltage of the regenerative braking circuit 11.

[0066] Subsequently, the control device 12 proceeds to step 595 and terminates this processing flow.

[0067] The control device 12 may perform step A below instead of steps 515 and 520.

[0068] Step A: The control device 12 increases or decreases the operating voltage based on the potential difference. <Effects> As described above, the dump truck 1 according to the second embodiment of the present invention appropriately distributes regenerative power to charging power and power for the regenerative braking circuit 11, taking into account the potential difference, so that the DC voltage of the DC bus can be stably controlled between the operating voltage of the regenerative braking circuit 11 and the operating voltage of the charging power control. <<Variation>> The present invention is not limited to the embodiments described above, and various modifications can be adopted within the scope of the present invention. Furthermore, the embodiments described above can be combined with each other as long as they do not depart from the scope of the present invention. The regenerative braking circuit 11 may be a power storage circuit that includes a battery 2 for driving a device other than the electric motor 4. In this case, the regenerative braking circuit 11 stores a portion of the regenerated power by performing an operation to store power by charging the battery 2 instead of consuming power. For convenience, the operation in which the regenerative braking circuit 11 stores power may also be referred to as a "power processing operation". [Explanation of symbols]

[0069] 1...Dump truck, 2...Battery, 3...Bidirectional power converter, 4...Electric motor, 5...DC reactor, 6...Voltage detector, 7...DC bus capacitor, 8...Power converter, 9...Gear, 10...Wheel, 11...Regenerative braking circuit, 12...Control device, 13...Voltage command switching command unit, 14...DC bus current sensor

Claims

1. An electric vehicle equipped with an electric motor and a storage battery, which runs using the electric motor, driven by power supplied from the storage battery, as its power source, and which is capable of charging the storage battery with regenerative power generated by the electric motor during regenerative braking, A power converter capable of converting input DC power into AC power and outputting it to the motor, and capable of converting the regenerative power input by the motor into DC power and outputting it, A bidirectional power converter connected to the power converter, capable of operating in either a state in which it receives DC power from the battery, converts the voltage, and outputs the DC power of the converted voltage to the power converter, or a state in which it receives DC power from the power converter, converts the voltage, and outputs the DC power of the converted voltage to the battery to perform charging power control, A regenerative braking circuit that performs power processing operations to store or consume the DC power input from the power converter, The regenerative braking circuit includes a control device capable of changing the first operating voltage at which the power processing operation is initiated, A current detection device for detecting the current input to the aforementioned bidirectional power converter, Equipped with, The first operating voltage is configured to be greater than the second operating voltage at which the bidirectional power converter starts the charging power control. The control device is Based on the current detected by the current detection device, the potential difference between the bidirectional power converter and the regenerative braking circuit is calculated. The first operating voltage is corrected according to the aforementioned potential difference. Electric vehicle.

2. In the electric vehicle according to claim 1, A voltage detection device for detecting DC bus voltage, Equipped with, The control device is Based on the DC bus voltage detected by the voltage detection device, the operation of the regenerative braking circuit and the bidirectional power converter is controlled. When the DC bus voltage reaches the first operating voltage, the regenerative braking circuit is controlled to perform the power processing operation. It is configured in such a way. Electric vehicle.

3. In the electric vehicle described in claim 2, The control device is When the DC bus voltage becomes less than the first operating voltage, the regenerative brake circuit is controlled to stop the power processing operation of the regenerative brake circuit. It is configured in such a way. Electric vehicle.

4. In the electric vehicle according to claim 1, The control device is The first operating voltage is corrected by setting the voltage obtained by adding the potential difference to the reference operating voltage of the regenerative braking circuit to the first operating voltage. It is configured in such a way. Electric vehicle.

5. In the electric vehicle according to claim 1, The control device is The system determines whether the battery is being charged, and if the battery is being charged, it performs a process to correct the first operating voltage. It is configured in such a way. Electric vehicle.

6. In the electric vehicle according to claim 1, The regenerative braking circuit is a circuit for consuming power, and performs the power processing operation that consumes the DC power input from the power converter. Electric vehicle.

7. In the electric vehicle according to claim 1, The regenerative braking circuit is a circuit for storing power, and performs the power processing operation for storing the DC power input from the power converter. Electric vehicle.

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