Generator controller, power assembly and power generation control method

Abstract

The invention discloses a generator controller, a power assembly and a power generation control method, and relates to the field of new energy automobiles. The generator controller comprises an inverter circuit comprising three phases of bridge arms, the two ends of any phase of bridge arm are used for being connected with the positive electrode and the negative electrode of a power battery respectively, any phase of bridge arm comprises an upper bridge arm switching tube and a lower bridge arm switching tube, and the middle point of the bridge arm is used for being connected with a phase winding of a generator through a first on-off device; and the control circuit is used for controlling the first on-off device corresponding to any phase of bridge arm to be switched off in response to the situation that the current of any phase of bridge arm is greater than a first preset current threshold value in the process of controlling the three-phase bridge arm to convert the received winding current of the generator into direct current to charge the power battery. Therefore, by controlling the first on-off device connected between the bridge arm midpoint of any phase of bridge arm and the generator to be switched off when the bridge arm is short-circuited, the faulted bridge arm can be isolated, so that the generator controller is kept in a normal working state, and the endurance mileage of the electric vehicle is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicles, and in particular to a generator controller, a powertrain, and a power generation control method. Background Art

[0002] With the development of electric vehicles, the generators in range-extended electric vehicles (REEVs) have attracted widespread attention for their ability to convert other forms of energy (such as mechanical energy generated by fuel combustion) into electrical energy during startup, thereby increasing the vehicle's range. The generator controller unit (GCU) is the component in an electric vehicle that controls the generator. The GCU is also connected to the power battery and is used to convert the alternating current (AC) provided by the generator into DC power for charging the power battery. Specifically, the GCU includes an inverter circuit that controls the on / off switching of the switching transistors in the inverter's bridge arms, converting the AC power received from the generator into DC power for charging the power battery.

[0003] However, when a short circuit occurs in one arm of the inverter circuit during the operation of the generator controller, the generator controller stops working and the generator can no longer supply power to the power battery through the generator controller, resulting in the problem of being unable to guarantee the cruising range of the electric vehicle where the generator controller is located. Summary of the Invention

[0004] Embodiments of the present application provide a generator controller, a powertrain, and a power generation control method, which are used to isolate the faulty bridge arm in the inverter circuit so that the generator controller can maintain a phase-loss working state and ensure the cruising range of the electric vehicle.

[0005] In the first aspect, the present application provides a generator controller, which includes an inverter circuit, a control circuit and a first disconnecting device, wherein: the inverter circuit includes a three-phase bridge arm, the first end of any phase bridge arm of the three-phase bridge arm is used to connect to the positive pole of the power battery, the second end of any phase bridge arm is used to connect to the negative pole of the power battery, any phase bridge arm includes an upper bridge arm switch tube and a lower bridge arm switch tube, the midpoint of any phase bridge arm is used to connect to a phase winding of the generator through a first disconnecting device, and a first disconnecting device is used to connect and disconnect the connection between the midpoint of any phase bridge arm and the corresponding phase winding of the generator; the control circuit is used to control the three-phase bridge arm to convert the received generator winding current into direct current to charge the power battery; in the process of the three-phase bridge arm charging the power battery, the control circuit is used to: in response to the current of any phase bridge arm being greater than a first preset current threshold, control the first disconnecting device corresponding to any phase bridge arm to disconnect.

[0006] In the power supply device provided in an embodiment of the present application, a first disconnecting device is provided in the generator controller between the midpoint of each phase bridge arm and the generator winding. During the process of each phase bridge arm controlling the three-phase bridge arm to convert the received generator winding current into direct current to charge the power battery, if the current of any phase bridge arm is detected to be greater than a first preset current threshold, that is, a short-circuit fault occurs in any phase bridge arm of the three-phase bridge arm, the first disconnecting device of any phase bridge arm is controlled to disconnect from the generator, so that the short-circuit current in any phase bridge arm does not flow back into the generator winding. In this way, controlling the disconnection of the first disconnecting device corresponding to any phase bridge arm can isolate the phase bridge arm of the three-phase bridge arm that has a short-circuit fault, so that the faulty phase bridge arm does not affect the normal operation of other phase bridge arms and the normal operation of the generator, thereby allowing the inverter circuit connected to the generator to enter a phase-loss operation state, ensuring that the generator controller can maintain an operating state to continuously charge the power battery, thereby ensuring the cruising range of the electric vehicle.

[0007] In one embodiment, each of the above-mentioned phase bridge arms is connected to a corresponding drive circuit, and a drive circuit is used to respectively drive the conduction and disconnection of the upper bridge arm switch tube and the lower bridge arm switch tube of the corresponding any phase bridge arm; in the process of the three-phase bridge arm charging the power battery, a drive circuit is used to: when the current of any phase bridge arm is greater than the first preset current threshold, before the first breaking device corresponding to any phase bridge arm is disconnected, in response to the short circuit of the upper bridge arm switch tube of any phase bridge arm, control the disconnection of the lower bridge arm switch tube of any phase bridge arm.

[0008] In this embodiment, by providing independent drive circuits for each of the three-phase bridge arms, a fault in any bridge arm or in the corresponding drive circuit of any bridge arm does not affect the normal drive control of the upper and lower bridge arm switches by the corresponding drive circuits of the other bridge arms, thereby improving the reliability and stability of the generator controller. Furthermore, when a short-circuit fault occurs in the upper bridge arm switch of any bridge arm, the unshorted lower bridge arm switch is controlled to shut off, thereby preventing a short-circuit fault in the power battery. Furthermore, by controlling the first disconnect device corresponding to any bridge arm to disconnect, the bridge arm experiencing the short-circuit fault is isolated, ensuring that the faulty bridge arm does not affect the normal operation of the other bridge arms, the generator, and the power battery. This also ensures that the generator controller can maintain its operating state and continuously charge the power battery.

[0009] In one embodiment, the above-mentioned generator controller also includes a second disconnecting device, and the first end of any phase bridge arm is used to connect to the positive pole of the power battery through a second disconnecting device, and the second disconnecting device is used to connect and disconnect the connection between any phase bridge arm and the positive pole of the power battery, or the second end of any phase bridge arm is used to connect to the negative pole of the power battery through a second disconnecting device, and the second disconnecting device is used to connect and disconnect the connection between any phase bridge arm and the negative pole of the power battery.

[0010] In this embodiment, the second disconnecting device is used to connect the bridge arm switch tube and the power battery. The setting of the second disconnecting device in any phase bridge arm can disconnect the connection between any phase bridge arm and the power battery when a short circuit fault occurs in any phase bridge arm, so that the faulty phase bridge arm will not affect the normal operation of other bridge arms and the power battery.

[0011] In one embodiment, during the process of the three-phase bridge arm charging the power battery, the above-mentioned control circuit is also used to: in response to the current of any phase bridge arm being greater than a second preset current threshold, control the first breaking device and the second breaking device corresponding to any phase bridge arm to disconnect, and the second preset current threshold is greater than or equal to the first preset current threshold.

[0012] In this embodiment, by controlling the simultaneous disconnection of the first and second disconnecting devices corresponding to any phase bridge arm, the connection between the phase bridge arm experiencing a short circuit fault and the generator and power battery can be disconnected, ensuring that the faulty phase bridge arm does not affect the normal operation of other phase bridge arms, the generator, and the power battery, and allowing the inverter circuit connected to the generator to enter a phase-loss operation state. Furthermore, if the first disconnecting device becomes stuck and cannot be disconnected, the provision of the second disconnecting device ensures that the control circuit can isolate the faulty phase bridge arm by controlling the disconnection of the second disconnecting device.

[0013] In one embodiment, the above-mentioned control circuit is also used to: in response to the current rising rate of any phase bridge arm being greater than a first preset rate, control the second breaking device corresponding to any phase bridge arm to disconnect, and then control the first breaking device corresponding to any phase bridge arm to disconnect.

[0014] In this embodiment, when the current rise rate of any phase bridge arm exceeds a first predetermined rate, the control circuit first controls the corresponding second disconnecting device of that phase bridge arm to disconnect, promptly severing the connection with the power battery. This prevents short-circuit current from damaging the power battery, thereby protecting the safety and lifespan of the power battery. Furthermore, by first disconnecting any phase bridge arm from the power battery, the generator has a buffer period, preventing overvoltage at the generator output due to a sudden loss of load and reducing the risk of overvoltage in the generator.

[0015] In one embodiment, the above-mentioned generator controller also includes a third disconnecting device, and the midpoint of the bridge arm of any phase is connected to the upper bridge arm switch tube of any phase bridge arm through a third disconnecting device, and a third disconnecting device is used to connect and disconnect the connection between the midpoint of the bridge arm of any phase and the upper bridge arm switch tube of any phase bridge arm, or the midpoint of the bridge arm of any phase is connected to the lower bridge arm switch tube of any phase bridge arm through a third disconnecting device, and a third disconnecting device is used to connect and disconnect the midpoint of the bridge arm of any phase and the lower bridge arm switch tube of any phase bridge arm.

[0016] In this embodiment, the third breaking device is used to connect the bridge arm switching tube and the midpoint of the bridge arm. By controlling the third breaking device corresponding to any phase bridge arm to disconnect, the connection between the upper bridge arm switching tube and the lower bridge arm switching tube in any phase bridge arm is disconnected. When the upper bridge arm switching tube in any phase bridge arm is short-circuited, the third breaking device is controlled to disconnect, and the connection between the normal lower bridge arm switching tube and the short-circuited upper bridge arm switching tube is disconnected, thereby preventing the fault from spreading to the lower bridge arm switching tube, thereby achieving protection of the components in the inverter circuit.

[0017] In one embodiment, during the process of the three-phase bridge arm charging the power battery, the above-mentioned control circuit is also used to: in response to the current of any phase bridge arm being greater than a third preset current threshold, control the first breaking device, the second breaking device and the third breaking device corresponding to any phase bridge arm to be disconnected, and the third preset current threshold is greater than or equal to the second preset current threshold.

[0018] In this embodiment, by controlling the first breaking device, the second breaking device and the third breaking device corresponding to any phase bridge arm to be disconnected at the same time, the connection between any phase bridge arm where a short circuit fault occurs and the generator and the power battery can be disconnected, and the connection between the upper bridge arm switch tube and the lower bridge arm switch tube of any phase bridge arm can be disconnected, thereby avoiding the expansion of the fault range in the inverter circuit, ensuring that the fault in any phase bridge arm will not affect the normal operation of other bridge arms, generators and power batteries, and allowing the inverter circuit connected to the generator to enter the phase-loss operation state.

[0019] In one embodiment, the above-mentioned control circuit is also used to: in response to the current rising rate of any phase bridge arm being greater than the second preset rate, control the second breaking device and the third breaking device corresponding to any phase bridge arm to be disconnected, and then control the first breaking device to be disconnected, and the second preset rate is greater than or equal to the first preset rate.

[0020] In this embodiment, when the current rising rate of any phase bridge arm is greater than the second preset rate, the second disconnecting device connected between any phase bridge arm and the power battery and the third disconnecting device connected between the upper bridge arm switch tube and the lower bridge arm switch tube in the bridge arm are disconnected first, and then the first disconnecting device is disconnected. This can avoid the expansion of the fault range, allow the generator to have a certain buffer time, avoid overvoltage at the output end of the generator due to sudden loss of load, and reduce the risk of overvoltage generated by the generator.

[0021] In one embodiment, during the process of the three-phase bridge arm charging the power battery, the above-mentioned control circuit is also used to: in response to the current of any phase bridge arm being greater than a fourth preset current threshold, control the first breaking device corresponding to each phase bridge arm of the three-phase bridge arm to disconnect, and the fourth preset current threshold is greater than or equal to the third preset current threshold.

[0022] In this embodiment, if the current of any phase bridge arm increases to exceed the fourth preset current threshold, it indicates that a serious fault has occurred in any phase bridge arm and may affect other phase bridge arms. At this time, only isolating any phase bridge arm and continuing to allow the other two phases to work may cause the other two phase bridge arms to also bear excessive current, causing damage to the entire inverter circuit. Therefore, by controlling the first breaking device corresponding to each phase bridge arm of the three-phase bridge arm to disconnect, the connection between the inverter circuit and the generator is cut off, which can effectively protect the inverter circuit, power battery and generator.

[0023] In one embodiment, during the process of the three-phase bridge arm charging the power battery, the control circuit is also used to: in response to the current of at least two phase bridge arms in the three-phase bridge arm being greater than a first preset current threshold, control the first breaking device corresponding to each phase bridge arm of the three-phase bridge arm to disconnect.

[0024] In this embodiment, it is detected that at least two of the three-phase bridge arms of the inverter circuit are short-circuited. Since it is difficult to convert the winding current of the generator into direct current and charge the power battery normally when the inverter circuit has a single-phase bridge arm working, the control circuit controls the first breaking device corresponding to each phase of the three-phase bridge arm to disconnect, thereby avoiding the inverter circuit from being in an abnormal working state and realizing protection of the components of the inverter circuit.

[0025] In one embodiment, during the process of the three-phase bridge arm charging the power battery, the above-mentioned control circuit is also used to: in response to the temperature of the power battery being greater than the first preset temperature or the temperature of the generator being greater than the second preset temperature, control the first breaking device corresponding to each phase arm of the three-phase bridge arm to disconnect, and the first preset temperature is lower than the second preset temperature.

[0026] In this embodiment, when the temperature of the power battery is greater than the first preset temperature, it indicates that the power battery is operating abnormally. When the temperature of the generator is greater than the second preset temperature, it indicates that the generator is operating abnormally. When the control circuit detects that the power battery or the generator is operating abnormally, the control circuit controls the first breaking device corresponding to each phase arm of the three-phase bridge arm to be disconnected, thereby cutting off the connection between the inverter circuit and the generator. At this time, the three-phase bridge arm no longer charges the power battery in the abnormal working state because it cannot receive the winding current of the generator, thereby achieving protection for the power battery and the generator.

[0027] In one embodiment, the first breaking device includes at least one of a thyristor, an insulated gate bipolar transistor, a triode, and a field effect transistor.

[0028] In this embodiment, when the first disconnecting device is set as a transistor or a field-effect transistor, since the thyristor, insulated gate bipolar transistor, transistor and field-effect transistor have fast turn-on and turn-off speeds, the isolation speed of the control circuit for any phase bridge arm with a short-circuit fault can be improved, thereby improving the safety of the generator and the generator controller.

[0029] In a second aspect, the present application provides a powertrain, which includes a generator and a generator controller as provided in the above embodiment, and the generator controller is used to control the generator.

[0030] In the third aspect, the present application provides a power generation control method, which is applied to the generator controller provided in the above embodiment. The generator controller includes an inverter circuit and a first disconnecting device. The inverter circuit includes a three-phase bridge arm. The first end of any phase bridge arm of the three-phase bridge arm is used to connect the positive pole of the power battery, and the second end of any phase bridge arm is used to connect the negative pole of the power battery. Any phase bridge arm includes an upper bridge arm switch tube and a lower bridge arm switch tube. The midpoint of any phase bridge arm is used to connect a phase winding of the generator through a first disconnecting device. A first disconnecting device is used to connect and disconnect the connection between the midpoint of any phase bridge arm and the corresponding phase winding of the generator. The power generation control method includes: controlling the three-phase bridge arm to convert the received generator winding current into direct current to charge the power battery; in response to the current of any phase bridge arm being greater than a first preset current threshold, controlling the first disconnecting device corresponding to any phase bridge arm to disconnect.

[0031] In one embodiment, any of the above-mentioned phase bridge arms is connected to a corresponding driving circuit, and a driving circuit is used to respectively drive the conduction and disconnection of the upper bridge arm switching tube and the lower bridge arm switching tube of the corresponding any phase bridge arm; the above-mentioned response to the current of any phase bridge arm being greater than the first preset current threshold, controlling the first breaking device corresponding to any phase bridge arm to disconnect, including: in response to the current of any phase bridge arm being greater than the first preset current threshold and the upper bridge arm switching tube of any phase bridge arm being short-circuited, controlling the driving circuit corresponding to any phase bridge arm to drive the lower bridge arm switching tube of any phase bridge arm to disconnect, and then controlling the first breaking device corresponding to any phase bridge arm to disconnect.

[0032] In this embodiment, the beneficial effects of the second and third aspects can be referred to the description of the first aspect and any implementation thereof, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic structural diagram of an electric vehicle provided in an embodiment of the present application;

[0034] Figure 2 A schematic structural diagram of a powertrain provided in an embodiment of the present application;

[0035] Figure 3 A schematic diagram of the structure of a generator controller provided in an embodiment of the present application;

[0036] Figure 4 A schematic flow chart of a power generation control method provided in an embodiment of the present application;

[0037] Figure 5 A schematic structural diagram of another generator controller provided in an embodiment of the present application;

[0038] Figure 6 A flow chart of another power generation control method provided in an embodiment of the present application;

[0039] Figure 7 A schematic structural diagram of another generator controller provided in an embodiment of the present application;

[0040] Figure 8 A schematic structural diagram of another generator controller provided in an embodiment of the present application;

[0041] Figure 9 A schematic structural diagram of another generator controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of the electric vehicle 1 provided in the embodiment of the present application. Figure 1 As shown, the electric vehicle 1 includes a powertrain 100 and a power battery 200 , and the powertrain 100 is used to supply power to the power battery 200 .

[0044] In some embodiments, the power battery 200 is used to power the driving motor ( Figure 1 The powertrain 100 supplies power to the power battery 200, which in turn powers the drive motor 1 to output torque. This powertrain converts the electrical energy provided by the power battery 200 into kinetic energy that drives the electric vehicle 1. For extended-range electric vehicles, the powertrain 100 supplies power to the power battery 200, ensuring the battery's charge and improving the vehicle's endurance.

[0045] It is understood that the power battery 200 in the embodiment of the present application can be a lithium-ion battery, a lithium metal battery, a lead-acid battery, a nickel-cadmium battery, a nickel-metal hydride battery, a lithium-sulfur battery, a lithium-air battery, or a sodium-ion battery, etc., without limitation herein. In terms of scale, the power battery 200 in the embodiment of the present application can be a single cell, a battery module, or a battery pack, without limitation herein. The power battery 200 can also power other electrical devices in the electric vehicle 1, such as the in-vehicle air conditioner, an in-vehicle audio player, etc.

[0046] In this embodiment, if Figure 2 As shown, the powertrain 100 includes a generator 300 and a generator controller 400. One end of the generator controller 400 is connected to the generator controller 400, and the other end of the generator controller 400 is connected to the power battery 200. The generator controller 400 is used to control the generator 300. When the generator 300 is started, the generator controller 400 converts the AC power provided by the generator 300 into DC power to charge the power battery, ensuring that the power level of the power battery 200 can meet the power requirements of the electric vehicle. In addition, the generator controller 400 can be integrated with the motor controller used to control the drive motor. Compared to designing and configuring the generator controller 400 and the motor controller separately, the integrated controller can reduce the controller space occupied and realize hardware resource sharing, thereby reducing system complexity and cost.

[0047] In some embodiments, if a short circuit fault, such as a short-circuited switch, occurs in any phase bridge arm of the inverter circuit of the generator controller 400 during operation, in order to avoid damage to the generator 300, it is necessary to control the motor controller so that the generator controller 400 no longer draws winding current from the generator 300 and stops charging the power battery 200. At this point, the generator controller 400 stops operating, but this may also cause the power level of the power battery 200 to drop to a level that is unable to meet the power requirements of the electric vehicle 1. Consequently, since the generator controller 400 no longer charges the power battery, the range of the electric vehicle 1 in which the generator controller 400 is located cannot be guaranteed.

[0048] To address the aforementioned issues, an embodiment of the present application provides a generator controller 400. When a bridge arm in the inverter circuit of the generator controller 400 fails, the generator controller 400 isolates the failed bridge arm, allowing the generator controller 400 to maintain operation and continue charging the power battery, thereby ensuring the range of the electric vehicle 1.

[0049] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0050] See also Figure 3 , Figure 3 A schematic diagram of the structure of the generator controller 400 provided in the embodiment of the present application. Figure 3 As shown, the generator controller 400 includes an inverter circuit 410, a control circuit 420 and a first breaking device K1.

[0051] In this embodiment, the inverter circuit 410 in the generator controller 400 includes a three-phase bridge arm 411. The first end of any phase bridge arm 411 of the three-phase bridge arm 411 is connected to the positive electrode of the power battery 200, and the second end of any phase bridge arm 411 is connected to the negative electrode of the power battery 200. Any phase bridge arm 411 includes an upper bridge arm switch Q1 and a lower bridge arm switch Q2. The bridge arm midpoint P of any phase bridge arm 411 is connected to a phase winding of the generator 300. The upper bridge arm switch Q1 and the lower bridge arm switch Q2 can at least be semiconductor components, such as insulated-gate bipolar transistors (IGBTs) or silicon carbide (SiC). Furthermore, the inverter circuit 410 is not limited to a conventional three-phase bridge arm 411 structure. The inverter circuit 410 can also have a multi-bridge arm structure, such as a six-phase bridge arm, without limitation herein.

[0052] The control circuit 420 can be electrically connected to the control ends of the upper bridge arm switch tube Q1 and the lower bridge arm switch tube Q2 corresponding to any phase bridge arm 411. The control circuit 420 is used to control the conduction and disconnection of the upper bridge arm switch tube Q1 and the lower bridge arm switch tube Q2 corresponding to any phase bridge arm 411, so that the three-phase bridge arm 411 converts the received generator 300 winding current into direct current to charge the power battery 200, so that the power of the power battery 200 can meet the power requirements of the electric vehicle and improve the cruising range of the electric vehicle.

[0053] Specifically, during normal operation of the inverter circuit 410, since the winding current output by the generator 300 is three-phase alternating current, its voltage and current vary sinusoidally over time, and the currents output by the three-phase windings are 120° out of phase with each other. The winding current output by each phase winding is input into the bridge arm midpoint P of the bridge arm to which it is connected. For example, for each phase bridge arm 411, when the control circuit 420 controls the upper bridge arm switch Q1 to be turned on, the lower bridge arm switch Q2 to be turned off. The current output by a phase winding of the generator 300 flows through the bridge arm midpoint P and then flows through the turned-on upper bridge arm switch Q1 to the positive electrode of the power battery 200. When the control circuit 420 controls the lower bridge arm switch Q2 to be turned on, the control circuit 420 controls the upper bridge arm switch Q1 to be turned off. The current flows from the negative electrode of the power battery 200 through the turned-on lower bridge arm switch Q2 to the bridge arm midpoint P and then flows back to the same phase winding of the generator 300. In this way, the control circuit 420 can control the direction and magnitude of the current by controlling the on-time and off-time of the upper bridge arm switch tube Q1 and the lower bridge arm switch tube Q2 of each phase bridge arm 411 in the inverter circuit 410. Moreover, when the control circuit 420 controls the upper bridge arm switch tube Q1 and the lower bridge arm switch tube Q2 of the three-phase bridge arm 411 in an orderly manner, at any moment of control, there are two bridge arm switch tubes turned on and one bridge arm switch tube turned off, so that the three-phase bridge arm 411 will rectify the received winding current of the generator 300 into direct current to charge the power battery 200.

[0054] In this embodiment, the bridge arm midpoint P of any phase bridge arm 411 is connected to a single-phase winding of the generator 300 via a first disconnecting device K1. The first disconnecting device K1 is used to connect and disconnect the bridge arm midpoint P of any phase bridge arm 411 and the corresponding single-phase winding of the generator 300. The control circuit 420 is electrically connected not only to the control terminals of the upper-arm switching transistor Q1 and the lower-arm switching transistor Q2 corresponding to any phase bridge arm 411, but also to the control terminal of the first disconnecting device K1 corresponding to any phase bridge arm 411. The control circuit 420 is used to control the conduction and disconnection of the upper-arm switching transistor Q1, the lower-arm switching transistor Q2, and the first disconnecting device K1 corresponding to any phase bridge arm 411.

[0055] In some embodiments, as Figure 4As shown, Figure 4 This is a flow chart of a power generation control method provided in an embodiment of the present application, which is applied to the above-mentioned generator controller 400. The power generation control method provided in this embodiment includes the following S510 and S520:

[0056] S510: Control the three-phase bridge arm to convert the received generator winding current into direct current to charge the power battery.

[0057] In this embodiment, the control circuit controls the three-phase bridge arm to convert the received winding current of the generator into direct current to charge the power battery. The control circuit is used to control the first breaking device corresponding to each phase bridge arm of the three-phase bridge arm to be turned on, so that the winding current output by each phase winding is input into the midpoint of the bridge arm to which it is connected through the turned-on first breaking device.

[0058] S520: In response to the current of any phase bridge arm being greater than a first preset current threshold, controlling the first breaking device corresponding to any phase bridge arm to disconnect.

[0059] In this embodiment, if a short circuit occurs in any phase bridge arm, such as a short circuit in the upper or lower bridge arm switching transistor of any phase bridge arm, and the control circuit detects that the current in any phase bridge arm is greater than a first preset current threshold, where the first preset current threshold is greater than the operating current of each phase bridge arm during normal operation, the control circuit controls the first disconnecting device corresponding to any phase bridge arm to open, thereby disconnecting the phase bridge arm from the corresponding generator winding. This prevents the short-circuit current in any phase bridge arm from flowing back into the generator winding, thereby protecting the generator.

[0060] In some embodiments, the control circuit 420 is further configured to control the remaining two-phase bridge arms 411 in the inverter circuit 410 to convert the received winding current of the generator 300 into direct current, thereby ensuring that the inverter circuit 410 experiencing a short-circuit fault can normally charge the power battery 200. The control circuit 420 is further configured to issue an alarm to the vehicle controller to notify the user of a fault in the inverter circuit 410 and to remind the user to promptly inspect and repair the vehicle. In this way, by isolating any phase bridge arm 411 experiencing a short-circuit fault, the faulty phase bridge arm 411 does not affect the normal operation of the other bridge arms and the normal operation of the generator 300, thereby allowing the inverter circuit 410 connected to the generator 300 to enter a phase-loss operation state, thereby ensuring that the generator controller 400 can maintain its working state to continuously charge the power battery 200.

[0061] In this embodiment, the first disconnecting device K1 includes at least one of a thyristor, an insulated gate bipolar transistor, a triode, and a field-effect transistor. Since thyristors, insulated gate bipolar transistors, triodes, and field-effect transistors have fast turn-on and turn-off speeds, they can improve the speed with which the control circuit 420 isolates any phase bridge arm 411 experiencing a short-circuit fault, thereby enhancing the operational safety of the generator 300 and the generator controller 400. Furthermore, the first disconnecting device K1 can be an active disconnecting device or a controlled disconnecting device. An active disconnecting device, such as a relay, is used to actively disconnect the circuit connection in response to an external control signal or instruction, thereby controlling the conduction and shutdown of the circuit. A controlled disconnecting device, such as the thyristors, insulated gate bipolar transistors, triodes, and field-effect transistors, is constrained by specific control conditions or signals, such as determining whether to disconnect the circuit based on a program or a signal input by an external sensor. Furthermore, the first disconnecting device K1 may also be a fuse, the melting of which is caused by heat accumulation caused by current overload. It is not an active disconnecting device based on an active control signal or instruction, nor is it a controlled disconnecting device directly constrained by specific control conditions.

[0062] In some embodiments, when the control circuit 420 controls the three-phase bridge arm 411 to charge the power battery 200, the control circuit 420 is also used to respond to the current of at least two phase bridge arms 411 in the three-phase bridge arm 411 being greater than a first preset current threshold, that is, it is detected that at least two phase bridge arms 411 in the three-phase bridge arm 411 of the inverter circuit 410 are short-circuited. Since it is difficult to convert the winding current of the generator 300 into direct current and charge the power battery 200 normally when a single-phase bridge arm 411 of the inverter circuit 410 is working, the control circuit 420 controls the first breaking device K1 corresponding to each phase bridge arm 411 of the three-phase bridge arm 411 to disconnect, so that the inverter circuit 410 no longer works.

[0063] In some embodiments, when the control circuit 420 controls the three-phase bridge arm 411 to charge the power battery 200, the control circuit 420 is also used to control the first breaking device K1 corresponding to each phase bridge arm 411 of the three-phase bridge arm 411 to disconnect in response to the temperature of the power battery 200 being greater than a first preset temperature or the temperature of the generator 300 being greater than a second preset temperature, wherein the first preset temperature is lower than the second preset temperature. When the temperature of the power battery 200 is greater than the first preset temperature, it indicates that the power battery 200 is operating abnormally. When the temperature of the generator 300 is greater than the second preset temperature, it indicates that the generator 300 is operating abnormally. When the control circuit 420 detects that the power battery 200 or the generator 300 is operating abnormally, in order to prevent the power battery 200 and the generator 300 from being continuously in an abnormal operating state and being damaged, the control circuit 420 controls the first breaking device K1 corresponding to each phase bridge arm 411 of the three-phase bridge arm 411 to be disconnected, cutting off the connection between the inverter circuit 410 and the generator 300. At this time, the three-phase bridge arm 411 no longer charges the power battery 200 in an abnormal operating state because it cannot receive the winding current of the generator 300, thereby protecting the power battery 200 and the generator 300.

[0064] In this embodiment, a first disconnecting device K1 is provided between the midpoint P of each phase bridge arm 411 and the winding of the generator 300 in the generator controller 400. When each phase bridge arm 411 controls the three-phase bridge arm 411 to convert the received winding current of the generator 300 into direct current to charge the power battery 200, if it is detected that the current of any phase bridge arm 411 is greater than the first preset current threshold, that is, when a short circuit fault occurs in any phase bridge arm 411 of the three-phase bridge arm 411, the first disconnecting device K1 of any phase bridge arm 411 is controlled to disconnect the connection with the generator 300, so that the short-circuit current appearing in any phase bridge arm 411 will not flow back to the winding of the generator 300. Based on this, controlling the disconnection of the first disconnecting device K1 corresponding to any phase bridge arm 411 can isolate any phase bridge arm 411 experiencing a short circuit fault in the three-phase bridge arm 411, ensuring that the faulty phase bridge arm 411 does not affect the normal operation of the other bridge arms and the normal operation of the generator 300. This allows the inverter circuit 410 connected to the generator 300 to enter a phase-loss operation state, ensuring that the generator controller 400 can maintain its operation to continuously charge the power battery 200, thereby ensuring the range of the electric vehicle. In addition, when the control circuit 420 detects that the current of at least two phase bridge arms 411 is greater than a first preset current threshold, the temperature of the power battery 200 is greater than a first preset temperature, or the temperature of the generator 300 is greater than a second preset temperature, it controls the disconnection of the first disconnecting device K1 corresponding to each phase bridge arm 411 of the three-phase bridge arm 411. This prevents the inverter circuit 410, the power battery 200, and the generator 300 from operating in an abnormal state, thereby protecting the inverter circuit 410, the power battery 200, and the generator 300.

[0065] See also Figure 5 , Figure 5 This is another structural diagram of the generator controller provided in the embodiment of the present application. Figure 5 As shown, the generator controller includes an inverter circuit 410, a control circuit 420 and a first breaking device K1.

[0066] In this embodiment, the inverter circuit 410 includes a three-phase bridge arm, and any one of the three-phase bridge arms includes an upper bridge arm switch tube Q1 and a lower bridge arm switch tube Q2. One end of the upper bridge arm switch tube Q1 of any one phase bridge arm is used to connect to the positive electrode of the power battery 200, and the other end of the upper bridge arm switch tube Q1 of any one phase bridge arm is used to connect to the bridge arm midpoint P. One end of the lower bridge arm switch tube Q2 of any one phase bridge arm is used to connect to the bridge arm midpoint P, and the other end of the lower bridge arm switch tube Q2 of any one phase bridge arm is used to connect to the negative electrode of the power battery 200. The bridge arm midpoint P of any one phase bridge arm is used to connect to a phase winding of the generator 300 through a first disconnecting device K1. In addition, in addition to the upper bridge arm switch tube Q1 and the lower bridge arm switch tube Q2 of the three-phase bridge arm, the inverter circuit 410 may also include a detection module ( Figure 5 Not shown), such as a temperature detection module, a current detection module, a voltage detection module, a short circuit detection module and a disconnection detection module.

[0067] In some embodiments, the generator controller further includes three drive circuits 430 , one for each phase bridge arm. Each drive circuit 430 is connected to the control terminals of the upper-arm switch Q1 and the lower-arm switch Q2 of the corresponding phase bridge arm. Each drive circuit 430 is configured to respectively drive the upper-arm switch Q1 and the lower-arm switch Q2 of the corresponding phase bridge arm to turn on and off. Specifically, the drive circuit 430 provides drive current to the upper-arm switch Q1 and the lower-arm switch Q2 connected thereto, enabling the upper-arm switch Q1 and the lower-arm switch Q2 to be turned on and off accurately and quickly. For example, when the upper arm switch tube Q1 and the lower arm switch tube Q2 are insulated gate bipolar transistors, the drive circuit 430 provides sufficient drive current to the control end of the bridge arm switch tube, so that the bridge arm switch tube can reach a saturated conduction or cut-off state in a short time, thereby reducing the conduction loss of the bridge arm switch tube and improving the efficiency of the inverter circuit 410. In addition, when the bridge arm switch tube works abnormally, the drive circuit 430 drives the bridge arm switch tube to turn off quickly, thereby protecting the bridge arm switch tube and the entire inverter circuit 410 from damage, thereby improving the safety and reliability of the use of the inverter circuit 410.

[0068] In this embodiment, the current detection module corresponding to any phase bridge arm is connected in series with the upper bridge arm switch Q1 and the lower bridge arm switch Q2 of any phase bridge arm. The current detection module is configured to determine whether the upper bridge arm switch Q1 and the lower bridge arm switch Q2 have a short circuit fault by detecting the current flowing through the upper bridge arm switch Q1 and the lower bridge arm switch Q2. During the process of controlling the three-phase bridge arm to convert the received winding current of the generator 300 into direct current to charge the power battery 200, the control circuit 420 determines that a short circuit fault has occurred in any phase bridge arm in response to detecting that the current in any phase bridge arm is greater than a first preset current threshold. The control circuit 420 is further configured to obtain the current value flowing through the upper bridge arm switch Q1 and the lower bridge arm switch Q2 detected by the current detection module of any phase bridge arm. If the current flowing through the upper bridge arm switch Q1 is greater than the first preset current threshold, the upper bridge arm switch Q1 in any phase bridge arm is determined to be short-circuited.

[0069] Since one end of any phase bridge arm is connected to the positive electrode of the power battery 200, and the other end of any phase bridge arm is connected to the negative electrode of the power battery 200, when a short circuit fault occurs in the upper bridge arm switch tube Q1 in any phase bridge arm, if the lower bridge arm switch tube Q2 in any phase bridge arm is driven to be turned on by the drive circuit 430, the positive electrode of the power battery 200 is connected to the negative electrode through the short-circuited any phase bridge arm, which is equivalent to short-circuiting the positive and negative electrodes of the power battery 200, and the power battery 200 is prone to short circuit faults.

[0070] In this embodiment, if Figure 6 As shown, Figure 6 This is a flow chart of another power generation control method provided in an embodiment of the present application, which is applied to the above-mentioned generator controller. The power generation control method provided in this embodiment includes the following S510 and S521:

[0071] S510: Control the three-phase bridge arm to convert the received generator winding current into direct current to charge the power battery.

[0072] In this embodiment, the specific steps of S510 may refer to the contents of S510 in the above embodiment, which will not be repeated here.

[0073] S521: In response to the current of any phase bridge arm being greater than a first preset current threshold and the upper bridge arm switch tube of any phase bridge arm being short-circuited, the drive circuit corresponding to any phase bridge arm is controlled to drive the lower bridge arm switch tube of any phase bridge arm to disconnect, and then the first breaking device corresponding to any phase bridge arm is controlled to disconnect.

[0074] In this embodiment, in response to the current of any phase bridge arm being greater than a first preset current threshold, before the control circuit controls the first breaking device corresponding to any phase bridge arm to disconnect, if it is detected that the upper bridge arm switch tube of any phase bridge arm is short-circuited, the control circuit is used to output a control instruction to the drive circuit correspondingly connected to any phase bridge arm, so that the drive circuit correspondingly connected to any phase bridge arm controls the lower bridge arm switch tube of any phase bridge arm to disconnect, so as to avoid a short circuit fault in the power battery, and then controls the first breaking device corresponding to any phase bridge arm to disconnect, so as to protect the generator.

[0075] In other embodiments, in response to the current in any phase bridge arm being greater than a first preset current threshold, before controlling the first disconnecting device corresponding to any phase bridge arm to disconnect, if the control circuit detects a short circuit in the lower bridge arm switch of any phase bridge arm, the control circuit is configured to output a control instruction to the corresponding drive circuit connected to any phase bridge arm, causing the corresponding drive circuit to control the upper bridge arm switch of any phase bridge arm to disconnect. This not only isolates the short-circuited phase bridge arm, ensuring that the faulty phase bridge arm does not affect the normal operation of other bridge arms, the generator, and the power battery, but also ensures that the generator controller can maintain an operating state to continuously charge the power battery, thereby improving the range of the electric vehicle.

[0076] In this embodiment, since the driving circuit 430 of each phase bridge arm in the three-phase bridge arm of the inverter circuit 410 is independent of each other, when any phase bridge arm fails or the driving circuit 430 corresponding to any phase bridge arm fails, it will not affect the normal driving control of the upper bridge arm switch tube Q1 and the lower bridge arm switch tube Q2 by the driving circuit 430 corresponding to other bridge arms, thereby improving the reliability and stability of the generator controller.

[0077] In some embodiments, the control circuit 420 is further configured to obtain a fault signal output by a detection module connected to any phase bridge arm. For example, when a temperature detection module in the detection module corresponding to any phase bridge arm detects an abnormal temperature of the bridge arm switching tube, or when a voltage detection module detects an abnormal voltage of the bridge arm switching tube, the control circuit 420 generates and outputs a fault signal to the control circuit 420. In this case, the control circuit 420 is configured to control the first disconnecting device K1 corresponding to any phase bridge arm to disconnect in response to the fault signal of any phase bridge arm.

[0078] In some embodiments, the control circuit 420 is further configured to obtain the drive current output by the drive circuit 430 connected to any phase bridge arm. When the bridge arm switch tube is short-circuited, the drive circuit 430 may provide a higher drive current to maintain the on state of the bridge arm switch tube, resulting in an abnormal increase in the drive current. In this case, the control circuit 420 is configured to control the first disconnect device K1 corresponding to any phase bridge arm to disconnect in response to the increase in the drive current of the drive circuit 430 corresponding to any phase bridge arm.

[0079] In some embodiments, the generator controller further includes a DC bus 440 , and the generator controller is configured to be connected to the power battery 200 via the DC bus 440 . Any phase bridge arm in the inverter circuit 410 is connected in parallel to the DC bus 440 to be connected to the power battery 200 via the DC bus 440 .

[0080] In this embodiment, the generator controller further includes a filter 450 and a bus capacitor 460, both of which are connected in parallel with the DC bus 440. Because the DC power output by the inverter circuit 410 is not ideally smooth after being rectified by the three-phase bridge arms of the inverter circuit 410, the filter 450, disposed between the inverter circuit 410 and the power battery 200, is used to filter the DC power output by the inverter circuit 410 to smooth out voltage and current fluctuations in the DC power, thereby providing relatively stable and smooth DC power to the power battery 200. During operation of the inverter circuit 410, the bus capacitor 460 is used to store electrical energy. When the DC power output by the inverter circuit 410 experiences transient changes or voltage fluctuations, the bus capacitor 460 acts as a buffer by releasing or absorbing electrical energy, maintaining the voltage stability of the DC bus 440.

[0081] In other embodiments, Figure 7 As shown, the driving circuit 430 corresponding to any phase bridge arm includes an upper bridge arm driving circuit 431 and a lower bridge arm driving circuit 432 .

[0082] In this embodiment, an upper-arm drive circuit 431 is connected to the control terminal of the upper-arm switch Q1 of any corresponding phase bridge arm, and is used to drive the corresponding upper-arm switch Q1 on and off. A lower-arm drive circuit 432 is connected to the control terminal of the lower-arm switch Q2 of any corresponding phase bridge arm, and is used to drive the corresponding lower-arm switch Q2 on and off. In this case, the drive circuits corresponding to the upper-arm switch Q1 and lower-arm switch Q2 of each phase bridge arm are independent of each other, enabling more precise and independent drive control of the upper-arm switch Q1 and lower-arm switch Q2.

[0083] Furthermore, in response to the current in any phase bridge arm being greater than a first preset current threshold, before controlling the first disconnecting device K1 corresponding to any phase bridge arm to disconnect, if the control circuit 420 detects that the upper bridge arm switch Q1 of any phase bridge arm is short-circuited, the control circuit 420 is configured to output a control instruction to the lower bridge arm drive circuit 432 connected to the corresponding phase bridge arm, causing the lower bridge arm drive circuit 432 connected to the corresponding phase bridge arm to control the lower bridge arm switch Q2 of any phase bridge arm to disconnect, and then control the first disconnecting device K1 corresponding to any phase bridge arm to disconnect. In this way, the upper bridge arm switch Q1 and the lower bridge arm switch Q2 of the same bridge arm may have different operating states during operation. The independent upper bridge arm drive circuit 431 and the lower bridge arm drive circuit 432 can cooperate with each other and respectively adopt corresponding control mechanisms based on the actual operating states of the upper bridge arm switch Q1 and the lower bridge arm switch Q2, thereby further improving the reliability and stability of the generator controller.

[0084] In this embodiment, by providing independent drive circuits 430 for each of the three-phase bridge arms, a fault in any bridge arm or in the corresponding drive circuit 430 of any bridge arm does not affect the normal drive control of the upper bridge arm switch Q1 and the lower bridge arm switch Q2 by the corresponding drive circuits 430 of the other bridge arms, thereby improving the reliability and stability of the generator controller. Furthermore, when a short-circuit fault occurs in the upper bridge arm switch Q1 of any bridge arm, the unshorted lower bridge arm switch Q2 is controlled to be turned off, thereby preventing a short-circuit fault in the power battery 200. Furthermore, by controlling the first disconnect device K1 corresponding to any bridge arm to open, the bridge arm experiencing a short-circuit fault is isolated, ensuring that the faulty bridge arm does not affect the normal operation of the other bridge arms, the generator 300, and the power battery 200. This also ensures that the generator controller can maintain its operating state and continuously charge the power battery 200.

[0085] In some embodiments, as Figure 8 As shown, Figure 8 This is another structural diagram of a generator controller provided in an embodiment of the present application. The generator controller provided in this embodiment includes an inverter circuit 410 , a control circuit 420 , a first breaking device K1 , and a drive circuit 430 .

[0086] In this embodiment, the inverter circuit 410 includes three-phase bridge arms. Each of the three-phase bridge arms includes an upper-arm switching transistor Q1 and a lower-arm switching transistor Q2. One end of the upper-arm switching transistor Q1 of each phase bridge arm is connected to the positive electrode of the power battery 200, and the other end of the upper-arm switching transistor Q1 of each phase bridge arm is connected to the bridge arm midpoint P. One end of the lower-arm switching transistor Q2 of each phase bridge arm is connected to the bridge arm midpoint P, and the other end of the lower-arm switching transistor Q2 of each phase bridge arm is connected to the negative electrode of the power battery 200. The bridge arm midpoint P of each phase bridge arm is connected to a single-phase winding of the generator 300 via a first disconnect device K1. In addition, each phase bridge arm is connected to a corresponding drive circuit 430, which is used to respectively drive the upper-arm switching transistor Q1 and the lower-arm switching transistor Q2 of each phase bridge arm to turn on and off.

[0087] Furthermore, the generator controller may further include a second disconnecting device K2, which is used to connect the bridge arm switch tube and the power battery 200. Figure 8 As shown in (a), the first end of any phase bridge arm is used to connect to the positive electrode of the power battery 200 through a second disconnecting device K2, that is, the upper bridge arm switch Q1 in any phase bridge arm is used to connect to the positive electrode of the power battery 200 through the second disconnecting device K2, and a second disconnecting device K2 is used to connect and disconnect any phase bridge arm and the positive electrode of the power battery 200. Or, as Figure 8 As shown in (b), the second end of any phase bridge arm is used to connect to the negative pole of the power battery 200 through a second disconnecting device K2, that is, the lower bridge arm switch tube Q2 in any phase bridge arm is used to connect to the negative pole of the power battery 200 through the second disconnecting device K2, and a second disconnecting device K2 is used to connect and disconnect the connection between any phase bridge arm and the negative pole of the power battery 200.

[0088] In some embodiments, when the control circuit 420 controls the three-phase bridge arms to charge the power battery 200, the control circuit 420 is further configured to control the first disconnecting device K1 and the second disconnecting device K2 corresponding to any phase bridge arm to disconnect in response to the current of any phase bridge arm being greater than a second preset current threshold, where the second preset current threshold is greater than or equal to the first preset current threshold. Specifically, the second preset current threshold may be equal to the first preset current threshold. When the second preset current threshold is greater than the first preset current threshold, the second preset current threshold may be 1.1 times the first preset current threshold, without limitation herein. Because the first disconnecting device K1 is used to connect the bridge arm midpoint P of any phase bridge arm with the corresponding single-phase winding of the generator 300, and the second disconnecting device K2 is used to connect any phase bridge arm with the power battery 200, when the control circuit 420 detects a short-circuit fault in any phase bridge arm and the short-circuit current is greater than a second preset current threshold, it can disconnect the connection between the phase bridge arm experiencing the short-circuit fault and the generator 300 and the power battery 200 by controlling the first disconnecting device K1 and the second disconnecting device K2 corresponding to any phase bridge arm to be simultaneously disconnected. This ensures that the faulty phase bridge arm does not affect the normal operation of other bridge arms, the generator 300, and the power battery 200, and allows the inverter circuit 410 connected to the generator 300 to enter a phase-loss operation state, ensuring that the generator controller can maintain its operating state and continuously charge the power battery 200. At the same time, the setting of the second breaking device K2 in any phase bridge arm can ensure that when a short circuit fault occurs in any phase bridge arm and the first breaking device K1 is sintered and cannot be disconnected, the control circuit 420 can isolate any faulty phase bridge arm by controlling the disconnection of the second breaking device K2.

[0089] In some embodiments, when controlling the three-phase bridge arms to charge the power battery 200, the control circuit 420 is further configured to, in response to a current rise rate in any phase bridge arm exceeding a first preset rate, control the first disconnecting device K1 corresponding to any phase bridge arm to disconnect after controlling the second disconnecting device K2 corresponding to any phase bridge arm to disconnect. The current rise rate reflects the rate of change of the current flowing through any phase bridge arm per unit time. At the moment of a short circuit, the current will rapidly rise from a normal operating value to a large value. The speed of this rise is the current rise rate. Due to differences in materials, structures, and processes, different bridge arm switches can withstand different rates of current change. Based on the critical value of the current rise rate that the upper bridge arm switch Q1 and the lower bridge arm switch Q2 in any phase bridge arm can withstand, which is set to a first preset rate, if the current rise rate passing through the bridge arm switch exceeds the first preset rate, the bridge arm switch may overheat and be damaged.

[0090] In this embodiment, when the current rise rate of any phase bridge arm exceeds a first preset rate, the control circuit 420 first controls the second disconnecting device K2 corresponding to any phase bridge arm to disconnect and promptly disconnect from the power battery 200. This prevents short-circuit current from damaging the power battery 200, thereby protecting the safety and lifespan of the power battery 200. The control circuit 420 then controls the first disconnecting device K1 corresponding to any phase bridge arm to disconnect from the windings of the generator 300. This prevents the short-circuit current from further affecting the generator 300 and damaging the generator 300 due to overcurrent, thereby helping to maintain stable operation of the generator 300. Furthermore, first disconnecting any phase bridge arm from the power battery 200 provides the generator 300 with a buffer period, preventing overvoltage at the output of the generator 300 due to a sudden loss of load and reducing the risk of overvoltage generation in the generator 300.

[0091] In some embodiments, as Figure 9 As shown, Figure 9 This is another structural diagram of a generator controller provided in an embodiment of the present application. The generator controller provided in this embodiment includes an inverter circuit 410 , a control circuit 420 , a first breaking device K1 , a second breaking device K2 , and a drive circuit 430 .

[0092] In this embodiment, the inverter circuit 410 includes three-phase bridge arms. Each of the three-phase bridge arms includes an upper bridge arm switching transistor Q1 and a lower bridge arm switching transistor Q2. One end of the upper bridge arm switching transistor Q1 of each phase bridge arm is connected to the positive electrode of the power battery 200, and the other end of the upper bridge arm switching transistor Q1 of each phase bridge arm is connected to the bridge arm midpoint P. One end of the lower bridge arm switching transistor Q2 of each phase bridge arm is connected to the bridge arm midpoint P, and the other end of the lower bridge arm switching transistor Q2 of each phase bridge arm is connected to the negative electrode of the power battery 200. The bridge arm midpoint P of each phase bridge arm is connected to a phase winding of the generator 300 via a first disconnecting device K1. The generator controller also includes a second disconnecting device K2. The first end of each phase bridge arm is connected to the positive electrode of the power battery 200 via the second disconnecting device K2, or the second end of each phase bridge arm is connected to the negative electrode of the power battery 200 via the second disconnecting device K2. In addition, each phase bridge arm is correspondingly connected to a driving circuit 430 , and each driving circuit 430 is used to respectively drive the upper bridge arm switch Q1 and the lower bridge arm switch Q2 of each corresponding phase bridge arm to be turned on and off.

[0093] In this embodiment, the generator controller may further include a third disconnecting device K3, which is used to connect the bridge arm switch tube and the bridge arm midpoint P.

[0094] In some embodiments, the second breaking device K2 and the third breaking device K3 in any phase bridge arm are respectively provided in the upper bridge arm and the lower bridge arm. For example, when the second breaking device K2 is provided in the upper bridge arm, the third breaking device K3 is provided in the lower bridge arm; and when the second breaking device K2 is provided in the lower bridge arm, the third breaking device K3 is provided in the upper bridge arm. In response to the current in any phase bridge arm being greater than a first current threshold, the second breaking device K2 and the third breaking device K3 corresponding to any phase bridge arm are controlled to be disconnected, thereby not only disconnecting the phase bridge arm from the power battery 200 and the generator 300, but also disconnecting the upper bridge arm switch Q1 and the lower bridge arm switch Q2 in any phase bridge arm, thereby protecting the upper bridge arm switch Q1 and the lower bridge arm switch Q2 in any phase bridge arm, as well as protecting the power battery 200 and the generator 300.

[0095] As an implementation method, Figure 9 As shown in (a), the midpoint P of any phase bridge arm is connected to the upper bridge arm switch Q1 of any phase bridge arm via a third disconnecting device K3. The third disconnecting device K3 is used to connect and disconnect the midpoint P of any phase bridge arm and the upper bridge arm switch Q1 of any phase bridge arm. At this time, the lower bridge arm switch Q2 in any phase bridge arm is connected to the negative electrode of the power battery 200 via a second disconnecting device K2. The second disconnecting device K2 is used to connect and disconnect the connection between any phase bridge arm and the negative electrode of the power battery 200.

[0096] As an implementation method, Figure 9 As shown in (b), the midpoint P of any phase bridge arm is connected to the lower bridge arm switch Q2 of any phase bridge arm via a third disconnecting device K3. The third disconnecting device K3 is used to connect and disconnect the midpoint P of any phase bridge arm and the lower bridge arm switch Q2 of any phase bridge arm. At this time, the upper bridge arm switch Q1 in any phase bridge arm is used to connect to the positive electrode of the power battery 200 via the second disconnecting device K2. The second disconnecting device K2 is used to connect and disconnect the connection between any phase bridge arm and the positive electrode of the power battery 200.

[0097] In some embodiments, the second breaking device K2 and the third breaking device K3 in any phase bridge arm are simultaneously provided in the upper bridge arm or simultaneously provided in the lower bridge arm; or, the second breaking device K2 is provided in both the upper bridge arm and the lower bridge arm in any phase bridge arm; or, the third breaking device K3 is provided in both the upper bridge arm and the lower bridge arm in any phase bridge arm, and no limitation is made here.

[0098] In some embodiments, when controlling the three-phase bridge arms to charge the power battery 200, the control circuit 420 is further configured to control the first disconnecting device K1, the second disconnecting device K2, and the third disconnecting device K3 corresponding to any phase bridge arm to disconnect in response to the current in any phase bridge arm being greater than a third preset current threshold, where the third preset current threshold is greater than or equal to the second preset current threshold. Specifically, the third preset current threshold may be equal to the second preset current threshold. When the third preset current threshold is greater than the second preset current threshold, the third preset current threshold may be 1.1 times the second preset current threshold, without limitation herein. Because the first disconnecting device K1 is used to connect the bridge arm midpoint P of any phase bridge arm with the corresponding single-phase winding of the generator 300, the second disconnecting device K2 is used to connect any phase bridge arm with the power battery 200, and the third disconnecting device K3 is used to connect the upper bridge arm switch Q1 with the lower bridge arm switch Q2, when the control circuit 420 detects a short-circuit fault in any phase bridge arm and the short-circuit current is greater than a third preset current threshold, it can simultaneously disconnect the first, second, and third disconnecting devices K1, K2, and K3 corresponding to any phase bridge arm. This disconnection can also be achieved by disconnecting the upper bridge arm switch Q1 from the generator 300 and the power battery 200, and by disconnecting the lower bridge arm switch Q2 from the upper bridge arm switch Q1. For example, if the upper bridge arm switch Q1 in any phase bridge arm is short-circuited, disconnecting the third disconnecting device K3 disconnects the normal lower bridge arm switch Q2 from the short-circuited upper bridge arm switch Q1, thereby preventing the fault from spreading to the lower bridge arm switch Q2. At the same time, it ensures that a fault in any phase bridge arm will not affect the normal operation of other bridge arms, the generator 300 and the power battery 200, and enables the inverter circuit 410 connected to the generator 300 to enter a phase-missing operation state to ensure that the generator controller can maintain the working state to continuously charge the power battery 200.

[0099] In some embodiments, during the process of controlling the three-phase bridge arms to charge the power battery 200, the control circuit 420 is further configured to, in response to a current rise rate in any phase bridge arm being greater than a second preset rate, control the first disconnecting device K1 to disconnect after controlling the second disconnecting device K2 and the third disconnecting device K3 corresponding to any phase bridge arm to disconnect, wherein the second preset rate is greater than or equal to the first preset rate. That is, the second preset rate may be equal to the first preset rate. When the second preset rate is greater than the first preset rate, the second preset rate may be approximately 5% higher than the first preset rate, without limitation herein.

[0100] In this embodiment, when the current rise rate of any phase bridge arm exceeds a second predetermined rate, the control circuit 420 first controls the second and third disconnecting devices K2 and K3 corresponding to any phase bridge arm to disconnect, thereby promptly severing the connection with the power battery 200 and disconnecting the upper bridge arm switch Q1 from the lower bridge arm switch Q2. This prevents the short-circuit current from damaging the power battery 200 and the normal bridge arm switches, thereby protecting the safety and lifespan of the power battery 200 and preventing the expansion of the fault range. The control circuit 420 then controls the first disconnecting device K1 corresponding to any phase bridge arm to disconnect from the windings of the generator 300, thereby preventing the short-circuit current from further affecting the generator 300 and damaging the generator 300 due to overcurrent, thereby helping to maintain stable operation of the generator 300. In addition, first disconnecting the connection between any phase bridge arm and the power battery 200 and the connection between the upper bridge arm switch tube Q1 and the lower bridge arm switch tube Q2 in the bridge arm can avoid the expansion of the fault range and allow the generator 300 to have a certain buffer time, thereby avoiding overvoltage at the output end of the generator 300 due to sudden loss of load, thereby reducing the risk of overvoltage generated by the generator 300.

[0101] In some embodiments, when the control circuit 420 controls the three-phase bridge arm to charge the power battery 200, the control circuit 420 is further configured to control the first disconnecting device K1 corresponding to each phase bridge arm of the three-phase bridge arm to disconnect in response to the current of any phase bridge arm being greater than a fourth preset current threshold. The fourth preset current threshold is greater than or equal to the third preset current threshold. That is, the fourth preset current threshold may be equal to the third preset current threshold. When the fourth preset current threshold is greater than the third preset current threshold, the fourth preset current threshold may be 1.1 times the third preset current threshold, without limitation. When a short circuit fault occurs in any phase bridge arm, if the short circuit current of any phase bridge arm increases to exceed the fourth preset current threshold, it indicates that the fault may be more serious. A serious fault in any phase bridge arm may affect other phase bridge arms. At this time, isolating only one phase bridge arm and continuing to operate the other two phases may cause the other two phase bridge arms to also be subjected to excessive current, causing damage to the entire inverter circuit 410. Therefore, when a fault is detected in any phase bridge arm and its current is greater than the fourth preset current threshold, the control circuit 420 is used to control the first breaking device K1 corresponding to each phase bridge arm of the three-phase bridge arm to be disconnected, cutting off the connection between the inverter circuit 410 and the generator 300, thereby effectively protecting the inverter circuit 410, the power battery 200 and the generator 300.

[0102] The above is only a specific embodiment of the present application, but the scope of protection of this application is not limited to this. Any changes or substitutions within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A generator controller, characterized in that: The generator controller includes an inverter circuit, a control circuit and a first breaking device, wherein: The inverter circuit includes a three-phase bridge arm, wherein a first end of any phase bridge arm of the three-phase bridge arm is used to connect to the positive electrode of the power battery, and a second end of any phase bridge arm is used to connect to the negative electrode of the power battery. The bridge arm of any phase includes an upper bridge arm switching tube and a lower bridge arm switching tube. The midpoint of the bridge arm of any phase is used to connect to a phase winding of a generator through a first disconnecting device, and the first disconnecting device is used to connect and disconnect the connection between the midpoint of the bridge arm of any phase and the corresponding phase winding of the generator; The control circuit is used to control the three-phase bridge arm to convert the received winding current of the generator into direct current to charge the power battery; During the process of the three-phase bridge arm charging the power battery, the control circuit is used to: In response to the current of any phase bridge arm being greater than a first preset current threshold, the first breaking device corresponding to any phase bridge arm is controlled to be disconnected.

2. The generator controller according to claim 1, characterized in that: Each of the phase bridge arms is correspondingly connected to a driving circuit, and the driving circuit is used to respectively drive the upper bridge arm switching tube and the lower bridge arm switching tube of the corresponding any of the phase bridge arms to be turned on and off; During the process of the three-phase bridge arm charging the power battery, the one driving circuit is used for: When the current of any phase bridge arm is greater than the first preset current threshold, before the first breaking device corresponding to any phase bridge arm is disconnected, in response to the short circuit of the upper arm switch tube of any phase bridge arm, the lower arm switch tube of any phase bridge arm is controlled to be disconnected.

3. The generator controller according to claim 1 or 2, characterized in that: The generator controller also includes a second disconnecting device, wherein the first end of any phase bridge arm is used to connect to the positive pole of the power battery through a second disconnecting device, and the second disconnecting device is used to connect and disconnect the connection between any phase bridge arm and the positive pole of the power battery, or the second end of any phase bridge arm is used to connect to the negative pole of the power battery through a second disconnecting device, and the second disconnecting device is used to connect and disconnect the connection between any phase bridge arm and the negative pole of the power battery.

4. The generator controller according to claim 3, characterized in that: During the process of the three-phase bridge arm charging the power battery, the control circuit is further configured to: In response to the current of any phase bridge arm being greater than a second preset current threshold, the first breaking device and the second breaking device corresponding to any phase bridge arm are controlled to be disconnected, and the second preset current threshold is greater than or equal to the first preset current threshold.

5. The generator controller according to claim 4, characterized in that: The control circuit is further configured to: In response to a current rising rate of any phase bridge arm being greater than a first preset rate, after controlling the second breaking device corresponding to any phase bridge arm to disconnect, the first breaking device corresponding to any phase bridge arm is controlled to disconnect.

6. The generator controller according to any one of claims 3 to 5, characterized in that: The generator controller also includes a third disconnecting device, wherein the midpoint of the bridge arm of any phase is connected to the upper bridge arm switch tube of any phase bridge arm through the third disconnecting device, and the third disconnecting device is used to connect and disconnect the connection between the midpoint of the bridge arm of any phase and the upper bridge arm switch tube of any phase bridge arm, or the midpoint of the bridge arm of any phase is connected to the lower bridge arm switch tube of any phase bridge arm through the third disconnecting device, and the third disconnecting device is used to connect and disconnect the midpoint of the bridge arm of any phase and the lower bridge arm switch tube of any phase bridge arm.

7. The generator controller according to claim 6, characterized in that: During the process of the three-phase bridge arm charging the power battery, the control circuit is further configured to: In response to the current of any phase bridge arm being greater than a third preset current threshold, the first breaking device, the second breaking device and the third breaking device corresponding to any phase bridge arm are controlled to be disconnected, and the third preset current threshold is greater than or equal to the second preset current threshold.

8. The generator controller according to claim 7, characterized in that: The control circuit is further configured to: In response to the current rising rate of any phase bridge arm being greater than a second preset rate, after controlling the second breaking device and the third breaking device corresponding to any phase bridge arm to disconnect, the first breaking device is controlled to disconnect, and the second preset rate is greater than or equal to the first preset rate.

9. The generator controller according to any one of claims 1 to 8, characterized in that: During the process of the three-phase bridge arm charging the power battery, the control circuit is further configured to: In response to the current of any phase bridge arm being greater than a fourth preset current threshold, the first breaking device corresponding to each phase bridge arm of the three-phase bridge arm is controlled to be disconnected, and the fourth preset current threshold is greater than or equal to the third preset current threshold.

10. The generator controller according to any one of claims 1 to 9, characterized in that: During the process of the three-phase bridge arm charging the power battery, the control circuit is further configured to: In response to the current of at least two phase bridge arms in the three-phase bridge arms being greater than the first preset current threshold, the first breaking device corresponding to each phase bridge arm of the three-phase bridge arms is controlled to be disconnected.

11. The generator controller according to any one of claims 1 to 10, characterized in that: During the process of the three-phase bridge arm charging the power battery, the control circuit is further configured to: In response to the temperature of the power battery being greater than a first preset temperature or the temperature of the generator being greater than a second preset temperature, the first breaking device corresponding to each phase arm of the three-phase bridge arm is controlled to be disconnected, and the first preset temperature is lower than the second preset temperature.

12. The generator controller according to any one of claims 1 to 11, characterized in that: The first breaking device includes at least one of a thyristor, an insulated gate bipolar transistor, a triode and a field effect transistor.

13. A powertrain, characterized in that: The powertrain includes a generator and a generator controller according to any one of claims 1 to 12, wherein the generator controller is used to control the generator.

14. A power generation control method, characterized in that: Applicable to a generator controller according to any one of claims 1 to 12, the generator controller comprising an inverter circuit and a first disconnecting device, the inverter circuit comprising a three-phase bridge arm, the first end of any phase bridge arm of the three-phase bridge arm being used to connect to the positive electrode of a power battery, the second end of any phase bridge arm being used to connect to the negative electrode of the power battery, the bridge arm of any phase comprising an upper bridge arm switching tube and a lower bridge arm switching tube, the midpoint of the bridge arm of any phase being used to connect to a phase winding of a generator via one of the first disconnecting devices, one of the first disconnecting devices being used to connect and disconnect the connection between the midpoint of the bridge arm of any phase and the corresponding one-phase winding of the generator, the power generation control method comprising: Controlling the three-phase bridge arm to convert the received winding current of the generator into direct current to charge the power battery; In response to the current of any phase bridge arm being greater than a first preset current threshold, the first breaking device corresponding to any phase bridge arm is controlled to be disconnected.

15. The power generation control method according to claim 14, characterized in that: Each of the phase bridge arms is correspondingly connected to a driving circuit, and the driving circuit is used to respectively drive the upper bridge arm switching tube and the lower bridge arm switching tube of the corresponding any of the phase bridge arms to be turned on and off; In response to the current of any phase bridge arm being greater than a first preset current threshold, controlling the first breaking device corresponding to any phase bridge arm to disconnect, comprises: In response to the current of any phase bridge arm being greater than the first preset current threshold and the upper arm switch tube of any phase bridge arm being short-circuited, the drive circuit corresponding to any phase bridge arm is controlled to drive the lower arm switch tube of any phase bridge arm to disconnect, and then the first breaking device corresponding to any phase bridge arm is controlled to disconnect.

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