Power supply control device, excitation control method, power system and vehicle

Abstract

The invention relates to a power supply control device, an excitation control method, a power system and a vehicle. The power supply control device comprises an excitation circuit, a switching circuit and a charging and discharging circuit. The excitation circuit is electrically connected with a target full-bridge unit in the charging and discharging circuit through the switching circuit, and the charging and discharging circuit is used for being connected with an alternating current power supply and electrically connected with a battery pack; and the excitation circuit is used for accessing the initial direct current output by the battery pack through the target full-bridge unit when the switching circuit is in a conducting state, and performing voltage transformation and rectification on the alternating current output after inversion of the target full-bridge unit to obtain a target direct current for performing electrical excitation on the motor. The excitation circuit additionally arranged in the power supply control device only needs to be used for voltage transformation and rectification, and an inversion part is realized by multiplexing the target full-bridge unit in the charging and discharging circuit, so that a part of circuits for realizing inversion do not need to be additionally arranged, the cost is reduced, and the integration level is improved.

Description

Technical Field

[0001] The present application relates to the field of aerosol technology, and in particular to a power supply control device, an excitation control method, a power system and a vehicle. Background Art

[0002] With the development of the new energy vehicle industry and the need to improve the competitiveness of automobile brands, higher and higher performance requirements are being put forward for hybrid vehicles: such as higher motor speed, etc. Compared with permanent magnet synchronous motors, electric excitation motors have the advantages of being cheaper (the rotor of permanent magnet synchronous motors usually uses relatively expensive rare earth permanent magnet materials) and having excellent high-speed performance.

[0003] However, the electrically excited motor requires an additional excitation circuit, where the excitation circuit is mainly used for inversion, transformation and rectification, resulting in the cost advantage of the electrically excited motor solution not being reflected, and the cost is even higher than that of the permanent magnet synchronous motor. Summary of the invention

[0004] The embodiments of the present application provide a power supply control device, an excitation control method, a power system and a vehicle. The added excitation circuit only needs to be used for voltage transformation and rectification. For the inversion part, the target full-bridge unit in the charging and discharging circuit is reused to implement it, so there is no need to add additional circuits for implementing inversion, so as to at least partially solve the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned object, according to a first aspect of the present application, there is provided a power supply control device, comprising an excitation circuit, a switch circuit and a charge-discharge circuit; The excitation circuit is electrically connected to the target full-bridge unit in the charge-discharge circuit through the switch circuit, and the charge-discharge circuit is used to access the AC power supply and be electrically connected to the battery pack; The excitation circuit is used to access the initial DC power output by the battery pack through the target full-bridge unit when the switching circuit is in the on state, and to transform and rectify the AC power output by the target full-bridge unit after inversion to obtain the target DC power for electrical excitation of the motor.

[0006] Optionally, the excitation circuit includes a first excitation unit and a second excitation unit, the switch circuit includes a first switch unit and a second switch unit, and the target full-bridge unit includes a first target full-bridge and a second target full-bridge; The first excitation unit is electrically connected to the first target full bridge through the first switch unit, and is used to connect the initial direct current through the first target full bridge when the first switch unit is in the on state, and transform and rectify the first alternating current output after the first target full bridge is inverted, so as to obtain the first target direct current for electrical excitation of the generator; The second excitation unit is electrically connected to the second target full bridge through the second switch unit, and is used to connect the initial DC power through the second target full bridge when the second switch unit is in the on state, and to transform and rectify the second AC power output after the second target full bridge is inverted, so as to obtain the second target DC power for electrically exciting the drive motor.

[0007] Optionally, the charge and discharge circuit includes a rectifier / inverter full bridge, a primary full bridge, a charge and discharge transformer, and a secondary full bridge electrically connected in sequence; The input end of the rectifier / inverter full bridge is used to connect to the AC power supply, and the output end of the secondary full bridge is used to connect to the battery pack; Any two of the rectifier / inverter full bridge, the primary full bridge and the secondary full bridge are respectively used as the first target full bridge and the second target full bridge.

[0008] Optionally, the power supply control device further includes a third switch unit and a fourth switch unit, the input end of the primary full bridge is electrically connected to the output end of the secondary full bridge through the third switch unit, and the output end of the primary full bridge is electrically connected to the primary side of the charge and discharge transformer through the fourth switch unit; The first excitation unit is electrically connected to the output end of the primary full bridge through the first switch unit, and the second excitation unit is electrically connected to the input end of the secondary full bridge through the second switch unit; Among them, the primary side full bridge is used as the first target full bridge, and the secondary side full bridge is used as the second target full bridge.

[0009] Optionally, the power supply control device further includes a third switch unit and a fourth switch unit, the input end of the primary full bridge is electrically connected to the output end of the secondary full bridge through the third switch unit, and the output end of the primary full bridge is electrically connected to the primary side of the charge and discharge transformer through the fourth switch unit; The first excitation unit is electrically connected to the input end of the secondary full bridge through the first switch unit, and the second excitation unit is electrically connected to the output end of the primary full bridge through the second switch unit; Among them, the secondary side full bridge is used as the first target full bridge, and the primary side full bridge is used as the second target full bridge.

[0010] Optionally, the first excitation unit is electrically connected to the input end of the rectifier / inverter full bridge through the first switch unit, and the second excitation unit is electrically connected to the input end of the secondary full bridge through the second switch unit; Among them, the rectifier / inverter full bridge is used as the first target full bridge, and the secondary full bridge is used as the second target full bridge.

[0011] Optionally, the first excitation unit is electrically connected to the input end of the secondary full bridge through the first switch unit, and the second excitation unit is electrically connected to the input end of the rectifier / inverter full bridge through the second switch unit; Among them, the secondary full bridge is used as the first target full bridge, and the rectifier / inverter full bridge is used as the second target full bridge.

[0012] Optionally, the power supply control device further includes a fourth switch unit, and the output end of the primary full bridge is electrically connected to the primary side of the charge and discharge transformer through the fourth switch unit; The first excitation unit is electrically connected to the input end of the rectifier / inverter full bridge through the first switch unit, and the second excitation unit is electrically connected to the output end of the primary full bridge through the second switch unit; Among them, the rectifier / inverter full bridge is used as the first target full bridge, and the primary side full bridge is used as the second target full bridge.

[0013] Optionally, the power supply control device further includes a fourth switch unit, and the output end of the primary full bridge is electrically connected to the primary side of the charge and discharge transformer through the fourth switch unit; The first excitation unit is electrically connected to the output end of the primary full bridge through the first switch unit, and the second excitation unit is electrically connected to the input end of the rectifier / inverter full bridge through the second switch unit; Among them, the primary full bridge is used as the first target full bridge, and the rectifier / inverter full bridge is used as the second target full bridge.

[0014] Optionally, the power supply control device further includes a power circuit; The power circuit is used to be electrically connected to the battery pack and the motor respectively, so as to realize power control between the battery pack and the motor.

[0015] Optionally, the power circuit includes a first power unit and a second power unit; The input end of the first power unit is used to be electrically connected to the generator, and the output end of the first power unit is used to be electrically connected to the battery pack; The input end of the second power unit is used to be electrically connected to the battery pack, and the output end of the second power unit is used to be electrically connected to the drive motor.

[0016] According to a second aspect of the present application, an excitation control method is provided, which is applied to the power supply control device in the above embodiment. The excitation control method includes: Control the first switch unit and the third switch unit to be in the on state respectively and the fourth switch unit and the second switch unit to be in the off state, and perform inversion control on the primary full bridge, so that the primary full bridge inverts the initial direct current connected through the third switch unit and outputs the first alternating current to the first excitation unit; Alternatively, the second switch unit is controlled to be in the on state and the first switch unit and the third switch unit are respectively in the off state, and the secondary full bridge is controlled to be inverted so that the secondary full bridge inverts the initial direct current connected and outputs the second alternating current to the second excitation unit.

[0017] According to a third aspect of the present application, an excitation control method is provided, which is applied to the power supply control device in the above embodiment. The excitation control method includes: Control the first switch unit to be in the on state and the second switch unit to be in the off state, and perform inversion control on the rectifier / inverter full bridge, so that the rectifier / inverter full bridge inverts the initial direct current connected through the secondary full bridge, the charge-discharge transformer and the primary full bridge and outputs the first alternating current to the first excitation unit; Alternatively, the second switch unit is controlled to be in an on state and the first switch unit is in an off state, and the secondary full bridge is controlled to be inverted so that the secondary full bridge inverts the initial direct current received and outputs the second alternating current to the second excitation unit.

[0018] According to a fourth aspect of the present application, a power system is provided, comprising a motor, a battery pack, and a power supply control device in any one of the above embodiments.

[0019] According to a fifth aspect of the present application, a vehicle is provided, comprising the power supply control device in any one of the above embodiments, or comprising the power system in any one of the above embodiments.

[0020] The excitation circuit added to the power supply control device in the present application only needs to be used for voltage transformation and rectification. For the inversion part, the target full-bridge unit in the charging and discharging circuit is reused to achieve it, so there is no need to add additional circuits for achieving inversion, which reduces costs and improves integration.

[0021] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0022] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0023] Figure 1 is a schematic structural diagram of a power system including a power supply control device provided in an exemplary embodiment of the present application; Figure 2 is a schematic diagram of a structure in which excitation is respectively provided for a generator and a drive motor in an exemplary embodiment of the present application; Figure 3 is a schematic diagram of a specific structure including a charging and discharging circuit provided in an exemplary embodiment of the present application; Figure 4is a specific circuit diagram of a power supply control device in a first mode provided in an exemplary embodiment of the present application; Figure 5 is a specific circuit diagram of the power supply control device in the second mode provided in the exemplary embodiment of the present application; Figure 6 is a specific circuit diagram of the power supply control device in the third mode provided in the exemplary embodiment of the present application; Figure 7 is a schematic diagram of a first current direction of generator excitation in a first mode provided in an exemplary embodiment of the present application; Figure 8 is a schematic diagram of a second current direction of generator excitation in a first mode provided in an exemplary embodiment of the present application; Fig. 9 is a schematic diagram of a first current direction for driving the excitation of a motor in a first mode provided in an exemplary embodiment of the present application; Fig.10 is a schematic diagram of a second current direction for driving the excitation of the motor in the first mode provided in an exemplary embodiment of the present application; Fig.11 is a schematic diagram of a first current direction of generator excitation in a second mode provided in an exemplary embodiment of the present application; Fig.12 Schematic diagram of a second current direction of generator excitation in a second mode provided in an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0025] According to the first aspect of the present application, Figure 1 As shown, a power supply control device is provided, including an excitation circuit, a switch circuit and a charge and discharge circuit.

[0026] The excitation circuit is electrically connected to the target full-bridge unit in the charge and discharge circuit through the switch circuit. The charge and discharge circuit is used to access the AC power supply and be electrically connected to the battery pack.

[0027] Among them, the charging and discharging circuit includes multiple full bridges, and the target full bridge unit refers to at least one full bridge in the charging and discharging circuit. The multiple full bridges in the charging and discharging circuit play corresponding rectification and / or inversion roles when the charging and discharging circuit is charging and discharging.

[0028] When the charge and discharge circuit is connected to the AC power output by the AC power source, the multiple full bridges in the charge and discharge circuit work together to rectify the AC power into DC power, thereby charging the battery pack. Or when the charge and discharge circuit is connected to the DC power output by the battery pack, the multiple full bridges in the charge and discharge circuit work together to invert the DC power into AC power, thereby performing AC discharge to the outside.

[0029] The excitation circuit is used to access the initial DC power output by the battery pack through the target full-bridge unit when the switching circuit is in the on state, and to transform and rectify the AC power output by the target full-bridge unit after inversion to obtain the target DC power for electrical excitation of the motor.

[0030] The excitation circuit may include an excitation transformer for voltage transformation, an excitation rectifier unit for rectification, and an excitation coil for electrical excitation.

[0031] Among them, when the switching circuit is in the on state, the excitation circuit forms a discharge loop with the battery pack through the switching circuit and the target full-bridge unit in the charging and discharging circuit. At this time, under the control of the corresponding electronic control of the charging and discharging circuit, the target full-bridge unit can invert the initial DC power output by the battery pack to obtain the corresponding AC power, and transmit the AC power to the excitation circuit. The excitation transformer in the excitation circuit transforms the AC power and transmits the transformed AC power to the excitation rectifier unit in the excitation circuit. The excitation rectifier unit can rectify the AC power to obtain the corresponding target DC power, thereby applying the target DC power to the excitation coil to electrically excite the motor through the excitation coil.

[0032] It can be seen that this embodiment uses the target full-bridge unit in the charge and discharge circuit to implement the inverter process, so that the added excitation circuit can be directly connected to the AC power without setting up a corresponding inverter unit to connect the initial DC power from the battery pack.

[0033] Among them, when the switch circuit is in the off state, the charge-discharge circuit can perform charge-discharge operations according to the above-mentioned process. It should be noted that when the switch circuit is in the on state, the functions of the charge-discharge circuit are not necessarily completely affected. By reasonably setting the connection relationship between the excitation circuit and the charge-discharge circuit, when the switch circuit is in the on state, at least part of the functions in the charge-discharge circuit can still work normally, that is, the purpose of the charge-discharge circuit and the excitation circuit working at the same time is achieved.

[0034] The excitation circuit added to the power supply control device in the present application only needs to be used for voltage transformation and rectification. For the inversion part, the target full-bridge unit in the charging and discharging circuit is reused to achieve it, so there is no need to add additional circuits for achieving inversion, which reduces costs and improves integration.

[0035] like Figure 1 As shown, optionally, the power supply control device also includes a power circuit.

[0036] The power circuit is used to be electrically connected to the battery pack and the motor respectively, so as to realize power control between the battery pack and the motor.

[0037] Among them, when the motor is specifically a drive motor, the power circuit is mainly used to realize the driving power control from the battery pack to the drive motor. Similarly, when the motor is specifically a generator, the power circuit is mainly used to realize the power generation control from the generator to the battery pack, which can also be understood as charging power control.

[0038] like Figure 2 As shown, optionally, the excitation circuit includes a first excitation unit and a second excitation unit, the switch circuit includes a first switch unit and a second switch unit, and the target full-bridge unit includes a first target full-bridge and a second target full-bridge.

[0039] The first excitation unit is electrically connected to the first target full bridge through the first switch unit, and is used to connect the initial DC power through the first target full bridge when the first switch unit is in the on state, and to transform and rectify the first AC power output after the first target full bridge is inverted, so as to obtain the first target DC power for electrical excitation of the generator.

[0040] The first excitation unit may include a first excitation transformer for voltage transformation, a first excitation rectifier unit for rectification, and a first excitation coil for electrical excitation.

[0041] Among them, when the first switch unit is in the on state, the first excitation unit forms a discharge loop with the battery pack through the first switch unit and the first target full bridge in the charge and discharge circuit. At this time, under the control of the corresponding electronic control of the charge and discharge circuit, the first target full bridge can invert the initial DC power output by the battery pack to obtain the corresponding first AC power, and transmit the first AC power to the first excitation unit. The first excitation transformer in the first excitation unit transforms the first AC power and transmits the transformed first AC power to the first excitation rectifier unit in the first excitation unit. The first excitation rectifier unit can rectify the first AC power to obtain the corresponding first target DC power, so as to apply the first target DC power to the first excitation coil to electrically excite the generator through the first excitation coil.

[0042] The second excitation unit is electrically connected to the second target full bridge through the second switch unit, and is used to connect the initial DC power through the second target full bridge when the second switch unit is in the on state, and to transform and rectify the second AC power output after the second target full bridge is inverted, so as to obtain the second target DC power for electrically exciting the drive motor.

[0043] The second excitation unit may include a second excitation transformer for voltage transformation, a second excitation rectifying unit for rectification, and a second excitation coil for electrical excitation.

[0044] Among them, when the second switch unit is in the on state, the second excitation unit forms a discharge loop with the battery pack through the second switch unit and the second target full bridge in the charge and discharge circuit. At this time, under the control of the corresponding electronic control of the charge and discharge circuit, the second target full bridge can invert the initial DC power output by the battery pack to obtain the corresponding second AC power, and transmit the second AC power to the second excitation unit. The second excitation transformer in the second excitation unit transforms the second AC power and transmits the transformed second AC power to the second excitation rectifier unit in the second excitation unit. The second excitation rectifier unit can rectify the second AC power to obtain the corresponding second target DC power, so as to apply the second target DC power to the second excitation coil to electrically excite the drive motor through the second excitation coil.

[0045] like Figure 2 As shown, optionally, the power circuit includes a first power unit and a second power unit.

[0046] The input end of the first power unit is used to be electrically connected to the generator, and the output end of the first power unit is used to be electrically connected to the battery pack.

[0047] The input end of the second power unit is used to be electrically connected to the battery pack, and the output end of the second power unit is used to be electrically connected to the drive motor.

[0048] In this embodiment, in view of the simultaneous existence of the generator and the drive motor, the power circuit correspondingly includes a first power unit and a second power unit to simultaneously realize the drive power control and the power generation power control.

[0049] like Figure 3 As shown, optionally, the charge and discharge circuit includes a rectifier / inverter full bridge, a primary full bridge, a charge and discharge transformer and a secondary full bridge electrically connected in sequence.

[0050] The input end of the rectifier / inverter full bridge is used to access the AC power supply, and the output end of the secondary full bridge is used to be electrically connected to the battery pack.

[0051] Among them, the rectifier / inverter full bridge is used to realize the rectification and inversion of the charging and discharging circuit during the charging and discharging process. The primary full bridge, the charging and discharging transformer and the secondary full bridge constitute the DCDC unit, which is used to realize DC transformation.

[0052] Specifically, during the charging process, the rectifier / inverter full bridge rectifies the AC power connected to the AC power supply and transmits the rectified DC power to the primary full bridge, the primary full bridge inverts the connected DC power and transmits the inverted AC power to the charge and discharge transformer, the charge and discharge transformer transforms the connected AC power and transmits the transformed AC power to the secondary full bridge, the secondary full bridge rectifies the connected AC power and transmits the rectified DC power to the battery pack to charge the battery pack.

[0053] Specifically, during the discharge process, the secondary full bridge inverts the DC power connected to the battery pack and transmits the inverted AC power to the charge and discharge transformer, the charge and discharge transformer transforms the connected AC power and transmits the transformed AC power to the primary full bridge, the primary full bridge rectifies the connected AC power and transmits the rectified DC power to the rectifier / inverter full bridge, the rectifier / inverter full bridge inverts the connected DC power and transmits the inverted AC power to the AC power supply to achieve AC discharge.

[0054] Any two of the rectifier / inverter full bridge, the primary full bridge and the secondary full bridge are respectively used as the first target full bridge and the second target full bridge.

[0055] Among them, since the structures of the rectifier / inverter full bridge, the primary full bridge and the secondary full bridge are basically the same and can respectively realize the inverter function, any two of them can be used as the first target full bridge and the second target full bridge respectively.

[0056] Optionally, the power supply control device also includes a third switch unit and a fourth switch unit, the input end of the primary full bridge is electrically connected to the output end of the secondary full bridge through the third switch unit, and the output end of the primary full bridge is electrically connected to the primary side of the charge and discharge transformer through the fourth switch unit.

[0057] Among them, Figure 4 As shown, the first excitation unit includes a first excitation rectifying unit composed of diodes D1 to D4 and a first excitation transformer T3, and the second excitation unit includes a second excitation rectifying unit composed of diodes D5 to D8 and a second excitation transformer T4.

[0058] The first switch unit includes a relay K8 and a relay K9 , the second switch unit includes a relay K10 and a relay K11 , the third switch unit includes a relay K5 and a relay K6 , and the fourth switch unit includes a relay K7 .

[0059] The rectifier / inverter full bridge includes MOS tubes Q1 to Q4, the primary side full bridge includes MOS tubes Q5 to Q8, and the secondary side full bridge includes MOS tubes Q9 to Q12.

[0060] The first excitation transformer T3 in the first excitation unit is electrically connected to the midpoint of the bridge arm of the MOS tubes Q5 to Q8 through the relays K8 and K9, the second excitation transformer T4 in the second excitation unit is electrically connected to the midpoint of the bridge arm of the MOS tubes Q9 to Q12 through the relays K10 and K11, the relay K5 is electrically connected to the drain of the MOS tube Q5, the drain of the MOS tube Q7, the drain of the MOS tube Q9 and the drain of the MOS tube Q11 respectively, the relay K6 is electrically connected to the source of the MOS tube Q6, the source of the MOS tube Q8, the source of the MOS tube Q10 and the source of the MOS tube Q12 respectively, and the relay K7 is electrically connected to the source of the MOS tube Q7, the drain of the MOS tube Q8 and the primary side of the charge-discharge transformer T1 respectively.

[0061] Among them, since MOS tubes Q5 to Q8 and MOS tubes Q9 to Q12 are respectively used as the first target full bridge and the second target full bridge, the DC power output by the positive electrode V+ and the negative electrode V- of the battery pack needs to be transmitted to MOS tubes Q5 to Q8 and MOS tubes Q9 to Q12 respectively.

[0062] Specifically, since the MOS tubes Q9 to Q12 are directly electrically connected to the positive electrode V+ and the negative electrode V- of the battery pack, the DC power output by the battery pack can be directly obtained. As for the MOS tubes Q5 to Q8, in the charge and discharge circuit, the primary and secondary sides of the charge and discharge transformer T1 are isolated from each other. Therefore, in order to ensure that the DC power output by the battery pack can be transmitted to the MOS tubes Q5 to Q8 and does not affect the normal function of the subsequent charge and discharge circuit, relays K5 and K6 are added. When the generator needs to be electrically excited by the MOS tubes Q5 to Q8, the relays K5 and K6 are controlled to be turned on; when the generator does not need to be electrically excited by the MOS tubes Q5 to Q8, the relays K5 and K6 are controlled to be disconnected to ensure the normal function of the charge and discharge circuit.

[0063] In addition, it should be noted that when the relay K5 and the relay K6 are turned on, due to the presence of body diodes in the MOS transistors Q5 to Q8, the MOS transistors Q5 to Q8 will be connected to the MOS transistors Q5 to Q8 through the charge-discharge transformer T1, resulting in functional failure. Therefore, in this embodiment, a relay K7 is further provided to be disconnected when the relay K5 and the relay K6 are turned on.

[0064] As a supplement, in other embodiments, the electrical connection relationship between the first excitation unit and the second excitation unit can be exchanged, that is, the first excitation transformer T3 is electrically connected to the bridge arm midpoint of the MOS tubes Q9 to Q12 through the relay K8 and the relay K9, and the second excitation transformer T4 is electrically connected to the bridge arm midpoint of the MOS tubes Q5 to Q8 through the relay K10 and the relay K11. When the positions are exchanged, the same function can be achieved.

[0065] The first power unit includes IGBT tubes T1 to T6, and the second power unit includes IGBT tubes T7 to T12.

[0066] Optionally, the first excitation unit is electrically connected to the input end of the secondary full bridge through a first switch unit, and the second excitation unit is electrically connected to the input end of the rectifier / inverter full bridge through a second switch unit.

[0067] Among them, Figure 5 As shown: The first excitation transformer T3 in the first excitation unit is electrically connected to the midpoint of the bridge arm of the MOS tubes Q1 to Q4 through relays K8 and K9, and the second excitation transformer T4 in the second excitation unit is electrically connected to the midpoint of the bridge arm of the MOS tubes Q9 to Q12 through relays K10 and K11.

[0068] Specifically, since the MOS tubes Q9 to Q12 are directly electrically connected to the positive electrode V+ and the negative electrode V- of the battery pack, the DC power output by the battery pack can be directly obtained. As for the MOS tubes Q1 to Q4, the DC power output by the battery pack can also be obtained through the DCDC unit composed of the MOS tubes Q5 to Q8, the charge and discharge transformer T1 and the MOS tubes Q9 to Q12.

[0069] In this embodiment, since the isolation effect between the primary and secondary sides of the charging and discharging transformer T1 is not affected whether the DC power is transmitted to the MOS transistors Q9 to Q12 or the MOS transistors Q1 to Q4, there is no need to set Figure 4 Relay K5, relay K6 and relay K7 in.

[0070] As a supplement, in other embodiments, the electrical connection relationship between the first excitation unit and the second excitation unit can be exchanged, that is, the first excitation transformer T3 is electrically connected to the bridge arm midpoint of the MOS tubes Q9 to Q12 through the relay K8 and the relay K9, and the second excitation transformer T4 is electrically connected to the bridge arm midpoint of the MOS tubes Q1 to Q4 through the relay K10 and the relay K11. When the positions are exchanged, the same function can be achieved.

[0071] Optionally, the power supply control device further includes a fourth switch unit, and the output end of the primary full bridge is electrically connected to the primary side of the charge and discharge transformer via the fourth switch unit.

[0072] Among them, Figure 6As shown, the first excitation transformer T3 in the first excitation unit is electrically connected to the midpoint of the bridge arm of the MOS tubes Q1 to Q4 through the relays K8 and K9, the second excitation transformer T4 in the second excitation unit is electrically connected to the midpoint of the bridge arm of the MOS tubes Q5 to Q8 through the relays K10 and K11, and the relay K7 is electrically connected to the source of the MOS tube Q7, the drain of the MOS tube Q8 and the primary side of the charge-discharge transformer T1 respectively.

[0073] Among them, the above embodiment has mentioned that when MOS tubes Q5 to Q8 are used to achieve inversion, it is easy to form a path through the charge and discharge transformer T1 and MOS tubes Q9 to Q12, resulting in functional failure, so it is still necessary to set a relay K7 to achieve isolation.

[0074] As a supplement, in other embodiments, the electrical connection relationship between the first excitation unit and the second excitation unit can be exchanged, that is, the first excitation transformer T3 is electrically connected to the bridge arm midpoint of the MOS tubes Q5 to Q8 through the relay K8 and the relay K9, and the second excitation transformer T4 is electrically connected to the bridge arm midpoint of the MOS tubes Q1 to Q4 through the relay K10 and the relay K11. When the positions are exchanged, the same function can be achieved.

[0075] It should be noted that Figures 4 to 6 The devices or units not mentioned in the above embodiments are all devices or units that realize the basic functions of the circuit, including the first filtering unit, the second filtering unit, the third filtering unit, the fuse F1, the fuse F2, the relays K1 to K4, the capacitors C1 to C5, and the inductors L1 to L3.

[0076] According to a second aspect of the present application, there is provided an excitation control method, which is applied to the power supply control device in the above-mentioned embodiment (refer to Figure 4 ), the excitation control methods include: The first switch unit and the third switch unit are controlled to be in the on state and the fourth switch unit and the second switch unit are controlled to be in the off state, and the primary full bridge is controlled to be inverted so that the primary full bridge inverts the initial direct current connected through the third switch unit and outputs the first alternating current to the first excitation unit.

[0077] Among them, refer to Figure 7 and Figure 8 , control relays K5, K6, K8 and K9 to be turned on and control relays K7, K10 and K11 to be turned off, control MOS tubes Q5 to Q8 to perform inversion processing, and realize electrical excitation of generator MG1 through the first excitation transformer T3 and the first excitation rectifier unit composed of diodes D1 to D4, wherein the current path refers to Figure 7 and Figure 8 Middle red dashed line.

[0078] The second switch unit is controlled to be in the on state and the first switch unit and the third switch unit are respectively in the off state, and the secondary full bridge is controlled to be inverted so that the secondary full bridge inverts the initial direct current connected and outputs the second alternating current to the second excitation unit.

[0079] Among them, refer to Fig. 9 and Fig.10 , control relays K10 and K11 to be turned on and control relays K5, K6, K8 and K9 to be turned off, control MOS tubes Q9 to Q12 to perform inversion processing, and realize electrical excitation of the drive motor MG2 through the second excitation transformer T4 and the second excitation rectifier unit composed of diodes D5 to D8, wherein the current path refers to Fig. 9 and Fig.10 Middle red dashed line.

[0080] It should be noted that, in this embodiment, the relay K7 can be turned on or off.

[0081] According to a third aspect of the present application, there is provided an excitation control method, which is applied to the power supply control device in the above-mentioned embodiment (refer to Figure 5 ), the excitation control methods include: The first switch unit is controlled to be in the on state and the second switch unit is in the off state, and the rectifier / inverter full bridge is controlled to be inverted so that the rectifier / inverter full bridge inverts the initial direct current connected through the secondary full bridge, the charge and discharge transformer and the primary full bridge and outputs the first alternating current to the first excitation unit.

[0082] Among them, refer to Fig.11 and Fig.12 , control relays K8 and K9 to be turned on and control relays K4, K10 and K11 to be turned off, control the DCDC unit composed of MOS tubes Q1 to Q4, the charge and discharge transformer T1 and MOS tubes Q9 to Q12 to work, access the DC power output by the battery pack and transmit it to MOS tubes Q1 to Q4, control MOS tubes Q1 to Q4 to perform inversion processing, and realize the electrical excitation of the generator MG1 through the first excitation transformer T3 and the first excitation rectifier unit composed of diodes D1 to D4, wherein the current path refers to Fig.11 and Fig.12 Middle red dashed line.

[0083] The second switch unit is controlled to be in an on state and the first switch unit is in an off state, and the secondary full bridge is controlled to be inverted so that the secondary full bridge inverts the initial direct current connected and outputs the second alternating current to the second excitation unit.

[0084] For the AC output to the second excitation unit, please refer to Fig. 9and Fig.10 , I will not go into details here.

[0085] It should be noted that, in this embodiment, since the MOS tubes Q1 to Q4 and the MOS tubes Q9 to Q12 are used at the same time, the working condition that the vehicle generates electricity while discharging to the outside can be realized.

[0086] In other embodiments, when MOS transistors Q1 to Q4 and MOS transistors Q5 to Q8 are used simultaneously, the corresponding control flow may refer to the above embodiment, which will not be described in detail herein.

[0087] According to a fourth aspect of the present application, a power system is provided, comprising a motor, a battery pack, and a power supply control device in any one of the above embodiments.

[0088] According to a fifth aspect of the present application, a vehicle is provided, comprising the power supply control device in any one of the above embodiments, or comprising the power system in any one of the above embodiments.

[0089] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0090] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0091] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0092] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. In the embodiments of the present application, the description of each embodiment has its own focus. For the parts not described in detail in a certain embodiment, please refer to the relevant contents of other embodiments. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A power supply control device, characterized in that: It includes an excitation circuit, a switching circuit and a charging and discharging circuit; The excitation circuit is electrically connected to the target full-bridge unit in the charge-discharge circuit through the switch circuit, and the charge-discharge circuit is used to access the AC power supply and be electrically connected to the battery pack; The excitation circuit is used to access the initial DC power output by the battery pack through the target full-bridge unit when the switching circuit is in the on state, and to transform and rectify the AC power output by the target full-bridge unit after inversion, so as to obtain the target DC power for electrical excitation of the motor.

2. The power supply control device according to claim 1, characterized in that: The excitation circuit includes a first excitation unit and a second excitation unit, the switch circuit includes a first switch unit and a second switch unit, and the target full-bridge unit includes a first target full-bridge and a second target full-bridge; The first excitation unit is electrically connected to the first target full bridge through the first switch unit, and is used to access the initial DC power through the first target full bridge when the first switch unit is in a conducting state, and to transform and rectify the first AC power output after the first target full bridge is inverted, so as to obtain the first target DC power for electrical excitation of the generator; The second excitation unit is electrically connected to the second target full bridge through the second switch unit, and is used to access the initial DC power through the second target full bridge when the second switch unit is in the on state, and to transform and rectify the second AC power output after the second target full bridge is inverted, so as to obtain the second target DC power for electrically exciting the drive motor.

3. The power supply control device according to claim 2, characterized in that: The charging and discharging circuit comprises a rectifier / inverter full bridge, a primary full bridge, a charging and discharging transformer and a secondary full bridge which are electrically connected in sequence; The input end of the rectifier / inverter full bridge is used to access an AC power source, and the output end of the secondary full bridge is used to be electrically connected to the battery pack; Any two of the rectifier / inverter full bridge, the primary full bridge and the secondary full bridge serve as the first target full bridge and the second target full bridge, respectively.

4. The power supply control device according to claim 3, characterized in that: The power supply control device further includes a third switch unit and a fourth switch unit, the input end of the primary full bridge is electrically connected to the output end of the secondary full bridge through the third switch unit, and the output end of the primary full bridge is electrically connected to the primary side of the charge-discharge transformer through the fourth switch unit; The first excitation unit is electrically connected to the output end of the primary full bridge through the first switch unit, and the second excitation unit is electrically connected to the input end of the secondary full bridge through the second switch unit; The primary full bridge serves as the first target full bridge, and the secondary full bridge serves as the second target full bridge.

5. The power supply control device according to claim 3, characterized in that: The power supply control device further includes a third switch unit and a fourth switch unit, the input end of the primary full bridge is electrically connected to the output end of the secondary full bridge through the third switch unit, and the output end of the primary full bridge is electrically connected to the primary side of the charge-discharge transformer through the fourth switch unit; The first excitation unit is electrically connected to the input end of the secondary full bridge through the first switch unit, and the second excitation unit is electrically connected to the output end of the primary full bridge through the second switch unit; The secondary full bridge serves as the first target full bridge, and the primary full bridge serves as the second target full bridge.

6. The power supply control device according to claim 3, characterized in that: The first excitation unit is electrically connected to the input end of the rectifier / inverter full bridge through the first switch unit, and the second excitation unit is electrically connected to the input end of the secondary full bridge through the second switch unit; Among them, the rectifier / inverter full bridge serves as the first target full bridge, and the secondary full bridge serves as the second target full bridge.

7. The power supply control device according to claim 3, characterized in that: The first excitation unit is electrically connected to the input end of the secondary full bridge through the first switch unit, and the second excitation unit is electrically connected to the input end of the rectifier / inverter full bridge through the second switch unit; Among them, the secondary full bridge serves as the first target full bridge, and the rectifier / inverter full bridge serves as the second target full bridge.

8. The power supply control device according to claim 3, characterized in that: The power supply control device further includes a fourth switch unit, and the output end of the primary full bridge is electrically connected to the primary side of the charge-discharge transformer through the fourth switch unit; The first excitation unit is electrically connected to the input end of the rectifier / inverter full bridge through the first switch unit, and the second excitation unit is electrically connected to the output end of the primary full bridge through the second switch unit; Among them, the rectifier / inverter full bridge serves as the first target full bridge, and the primary side full bridge serves as the second target full bridge.

9. The power supply control device according to claim 3, characterized in that: The power supply control device further includes a fourth switch unit, and the output end of the primary full bridge is electrically connected to the primary side of the charge-discharge transformer through the fourth switch unit; The first excitation unit is electrically connected to the output end of the primary full bridge through the first switch unit, and the second excitation unit is electrically connected to the input end of the rectifier / inverter full bridge through the second switch unit; Among them, the primary full bridge serves as the first target full bridge, and the rectifier / inverter full bridge serves as the second target full bridge.

10. The power supply control device according to claim 1, characterized in that: The power supply control device also includes a power circuit; The power circuit is used to be electrically connected to the battery pack and the motor respectively, so as to realize power control between the battery pack and the motor.

11. The power supply control device according to claim 10, characterized in that: The power circuit includes a first power unit and a second power unit; The input end of the first power unit is used to be electrically connected to the generator, and the output end of the first power unit is used to be electrically connected to the battery pack; The input end of the second power unit is used to be electrically connected to the battery pack, and the output end of the second power unit is used to be electrically connected to the drive motor.

12. An excitation control method, characterized in that: Applied to the power supply control device according to claim 4, the excitation control method comprises: Controlling the first switch unit and the third switch unit to be in the on state respectively and the fourth switch unit and the second switch unit to be in the off state, and performing inversion control on the primary full bridge, so that the primary full bridge inverts the initial direct current connected through the third switch unit and outputs the first alternating current to the first excitation unit; Alternatively, the second switch unit is controlled to be in the on state and the first switch unit and the third switch unit are respectively in the off state, and the secondary full bridge is controlled to be inverted so that the secondary full bridge inverts the initial direct current connected and outputs the second alternating current to the second excitation unit.

13. An excitation control method, characterized in that: Applied to the power supply control device according to claim 6, the excitation control method comprises: Controlling the first switch unit to be in an on state and the second switch unit to be in an off state, and performing inversion control on the rectifier / inverter full bridge, so that the rectifier / inverter full bridge inverts the initial direct current connected through the secondary full bridge, the charge-discharge transformer and the primary full bridge, and outputs the first alternating current to the first excitation unit; Alternatively, the second switch unit is controlled to be in an on state and the first switch unit is in an off state, and the secondary full bridge is controlled to be inverted so that the secondary full bridge inverts the initial direct current received and outputs the second alternating current to the second excitation unit.

14. A power system, characterized in that: It comprises a motor, a battery pack and the power supply control device according to any one of claims 1 to 11.

15. A vehicle, characterized in that: It comprises the power supply control device according to any one of claims 1 to 11, or comprises the power system according to claim 14.

Images