Power control circuit, electric vehicle, vehicle-mounted charger and control method thereof

Abstract

The invention provides a power control circuit, an electric vehicle, a vehicle-mounted charger and a control method thereof, and the control circuit of the vehicle-mounted charger can control a voltage conversion circuit to work in different working modes, so that the voltage conversion circuit can achieve the basic function of energy interaction between a power grid and at least one energy storage device. The voltage conversion circuit can also control the output power of the high-voltage battery when the high-voltage battery in the at least one energy storage device supplies power to the first electric device. Therefore, the functions which can be realized by the vehicle-mounted charger are enriched, the vehicle-mounted charger can be applied to different scenes, and the vehicle-mounted charger can meet the requirements of higher integration and high power density.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a power control circuit, an electric vehicle, an on-board charger and a control method thereof. Background Art

[0002] With the continuous development of electric vehicles, on-board electronic equipment is also showing a trend of miniaturization, integration, and high power density. As the core component of energy conversion in electric vehicles, on-board chargers (OBC) are also in urgent need of meeting more needs of electric vehicles with smaller size and higher power density.

[0003] In the prior art, on-board chargers usually have limited functions. For example, they can convert the AC power of the power grid into DC power and provide it to high-voltage batteries or low-voltage batteries for charging, or they can provide the voltage of the high-voltage battery to external loads of the electric vehicle.

[0004] However, the functions that can be provided by the on-board charger in the prior art are relatively limited. Therefore, how to enrich the functions of the on-board charger is a technical problem that needs to be solved in this field. Summary of the invention

[0005] The present application provides a power control circuit, an electric vehicle, an on-board charger and a control method thereof, so as to overcome the technical problem that the functions of the on-board charger in the prior art are relatively limited.

[0006] In a first aspect, the present application provides an on-board charger, comprising: a PFC circuit, connected to a power grid and a voltage conversion circuit, respectively; the voltage conversion circuit, connected to the PFC circuit, a first electrical device and at least one energy storage device, respectively; and a control circuit, used to control the voltage conversion circuit to operate in an on-board charger mode for converting the voltage between the PFC circuit and the at least one energy storage device, or in a power control mode for controlling the power supplied by the at least one energy storage device to the first electrical device.

[0007] A second aspect of the present application provides an electric vehicle, comprising the on-board charger provided in the first aspect of the present application.

[0008] The third aspect of the present application provides a power control circuit, including a first battery pack, a second battery pack, a third bridge arm, a fourth bridge arm, a capacitor, a third control switch, a fourth control switch, a first inductor, a second inductor and a third inductor; wherein, the load, the capacitor, the third bridge arm and the fourth bridge arm are connected in parallel in sequence, the midpoint of the third bridge arm is connected between the first battery pack and the second battery pack through the fourth control switch and the second inductor, the midpoint of the fourth bridge arm is connected between the first battery pack and the second battery pack through the third control switch and the first inductor, and the third inductor is arranged between the fourth bridge arm and the positive electrode of the first battery pack.

[0009] In a fourth aspect, the present application provides a control method for a vehicle charger, comprising a first battery pack, a second battery pack, a third bridge arm, a fourth bridge arm, a capacitor, a third control switch, a fourth control switch, a first inductor, a second inductor and a third inductor; wherein, the load, the capacitor, the third bridge arm and the fourth bridge arm are connected in parallel in sequence, the midpoint of the third bridge arm is connected between the first battery pack and the second battery pack through the fourth control switch and the second inductor, the midpoint of the fourth bridge arm is connected between the first battery pack and the second battery pack through the third control switch and the first inductor, and the third inductor is arranged between the fourth bridge arm and the positive electrode of the first battery pack.

[0010] In summary, in the power control circuit, electric vehicle, on-board charger and control method provided by the present application, the control circuit of the on-board charger can control the voltage conversion circuit to operate in different working modes, so that the voltage conversion circuit can realize the basic function of energy interaction between the power grid and at least one energy storage device. The voltage conversion circuit can also realize the output power of the high-voltage battery when the high-voltage battery in at least one energy storage device supplies power to the first power-consuming device. Therefore, the power control circuit, electric vehicle, on-board charger and control method provided by the present application enable the on-board charger to provide different working modes, enrich the functions that the on-board charger can realize, so that the on-board charger can be applied to different scenarios, and then the on-board charger can meet the requirements for more integration and high power density. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0012] Figure 1A schematic structural diagram of an embodiment of an electric vehicle provided in this application;

[0013] Figure 2 A schematic diagram of the structure of an embodiment of a vehicle-mounted charger provided in this application;

[0014] Figure 3 A schematic diagram of the structure of an embodiment of a voltage conversion circuit provided by the present application;

[0015] Figure 4 A schematic diagram of the circuit structure of the first voltage conversion module provided in this application;

[0016] Figure 5 A schematic diagram of the circuit structure of the second voltage conversion module provided in this application;

[0017] Figure 6 A schematic diagram of the circuit structure of the third voltage conversion module provided in this application;

[0018] Figure 7 A schematic diagram of the circuit structure of another voltage conversion circuit provided in the present application;

[0019] Figure 8 A schematic diagram of the circuit structure of a power control circuit provided in this application. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] Figure 1 A schematic diagram of the structure of an embodiment of an electric vehicle provided in this application, such as Figure 1As shown, the electric vehicle 1 used in the present application includes an on-board charger 10 and at least one energy storage device. The on-board charger 10 (OBC) is a core component for energy conversion in the electric vehicle 1. In one embodiment, Figure 1 The at least one energy storage device shown includes a high voltage battery 11 and a low voltage battery 12, or in another embodiment, the at least one energy storage device may include a high voltage battery 11. In one embodiment, the low voltage battery 12 may also be a load provided in the electric vehicle 1.

[0023] When the electric vehicle 1 is connected to the external power grid 2, the on-board charger 10 can be used to receive the AC power provided by the external power grid 2, convert the AC power into DC power, and perform voltage conversion and other processing before charging the high-voltage battery 11 or the low-voltage battery 12. Alternatively, when the electric vehicle 1 is connected to a second power-consuming device 3 outside the electric vehicle 1, the on-board charger 10 can be used to perform voltage conversion and other processing on the DC power provided by the high-voltage battery 11 before supplying power to the second power-consuming device 3.

[0024] However, in the prior art, the on-board charger 10 generally does not have other functions except for the above functions, so that the on-board charger 10 can be relatively limited. Under the current trend of integration and high power density of on-board equipment of electric vehicles 1, how to enrich the functions of the on-board charger 10 so that the on-board charger 10 can be used in more scenarios, thereby improving the utilization rate of the on-board charger 10 to meet the demand for integration and high power density of the on-board charger 10 is a technical problem that needs to be solved in this field.

[0025] Based on the technical problems to be solved in the above-mentioned prior art, the present application provides a vehicle charger, a battery power control circuit and an electric vehicle. The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0026] Figure 2 This is a structural diagram of an embodiment of a vehicle charger provided in this application, as shown in Figure 2 The vehicle charger 10 shown can be applied to Figure 1 In the electric vehicle 1 shown.

[0027] Specifically, Figure 2The on-board charger in the electric vehicle 1 shown includes: a PFC circuit 101, a voltage conversion circuit 102 and a control circuit 100. The PFC circuit 101 is connected to the power grid 2 and the voltage conversion circuit 102 respectively, and the voltage conversion circuit 102 is connected to the PFC circuit 101, the high-voltage battery 11, the low-voltage battery 12 and the first electrical device 14 provided inside the electric vehicle 1 respectively.

[0028] The control circuit 100 is connected to the PFC circuit 101 and the voltage conversion circuit 102 respectively, and the control circuit 100 can be used to execute the control method of the on-board charger, thereby realizing the control of the PFC circuit 101 and the voltage conversion circuit 102. In the embodiment of the present application, when the control circuit 100 executes the control method of the on-board charger, it can be used to control the voltage conversion circuit 102 to work in different modes.

[0029] The PFC circuit 101 can be used to convert the alternating current on the grid 2 side into the direct current on the voltage conversion circuit 102 side and improve the power factor.

[0030] The voltage conversion circuit 102 includes two working modes, which are recorded as the on-board charger mode and the power control mode. The control circuit 100 can be used to control the voltage conversion circuit 102 to work in the on-board charger mode, or to control the voltage conversion circuit 102 to work in the power control mode. In a specific implementation, the on-board charger mode can also be called the OBC mode, and the power control mode can also be called the battery energy control (Bettery Energy Control, BEC) mode, etc.

[0031] Among them, when the voltage conversion circuit 102 works in the vehicle charger mode, the voltage conversion circuit 102 can be used to convert the voltage between the PFC circuit and at least one energy storage device; when the voltage conversion circuit 102 works in the power control mode, the voltage conversion circuit 102 can be used to control the power supplied by the high-voltage battery 11 in at least one energy storage device to the first electrical device.

[0032] In one embodiment, when the electric vehicle 1 is driving, the voltage conversion circuit 102 operates in the on-board charger mode; when the electric vehicle 1 is parked, the voltage conversion circuit 102 operates in the power control mode. The control circuit 100 can control the voltage conversion circuit 102 according to the state of the electric vehicle, so that the voltage conversion circuit 102 operates in the working state corresponding to the state of the electric vehicle 1.

[0033] Therefore, in the on-board charger 10 provided in this embodiment, the control circuit 100 can control the voltage conversion circuit 102 to work in different working modes, so that the voltage conversion circuit 102 can realize the basic function of energy interaction between the power grid 2 and at least one energy storage device. On this basis, the voltage conversion circuit 102 can also realize the control of the output power of the high-voltage battery 12 when the high-voltage battery 12 in at least one energy storage device supplies power to the first power-consuming device 14. Therefore, the on-board charger 10 provided in this embodiment can provide different working modes, enrich the functions that the on-board charger 10 can realize, so that the on-board charger 10 can be applied to different scenarios, and further enable the on-board charger 10 to meet the requirements for more integration and high power density.

[0034] More specifically, in one embodiment of the present application, when the voltage conversion circuit 102 works in the on-board charger mode, the control circuit 100 can specifically control the voltage conversion circuit 102 so that the voltage conversion circuit 102 is in 6 different working states and realizes different functions respectively. The 6 working states that the voltage conversion circuit 102 can realize are:

[0035] Working state 1: the grid 2 charges the high-voltage battery 11 through the PFC circuit 101 and the voltage conversion circuit 102 .

[0036] Working state 2: the grid 2 charges the low-voltage battery 12 through the PFC circuit 101 and the voltage conversion circuit 102 .

[0037] Working state 3: the high-voltage battery 11 supplies power to the grid 2 through the voltage conversion circuit 102 .

[0038] Working state 4: the high-voltage battery 11 supplies power to the second power-consuming device 3 through the voltage conversion circuit 102 and the PFC circuit 101 .

[0039] Working state 5: the high-voltage battery 11 discharges to the low-voltage battery 12 through the voltage conversion circuit 102 , thereby charging the low-voltage battery 12 .

[0040] Working state 6: the low-voltage battery 12 discharges to the high-voltage battery 11 through the voltage conversion circuit 102 , thereby charging the high-voltage battery 11 .

[0041] In one embodiment, the high-voltage battery 11 in at least one energy storage device provided in the present application supports multiple different output powers. When the voltage conversion circuit 102 operates in the power control mode, the control circuit 100 can specifically control the voltage conversion circuit 102 so that the high-voltage battery 11 can supply power to the first electrical device 14 through the voltage conversion circuit 102 at a target output power among multiple different output powers.

[0042] In one embodiment, if Figure 2 The high-voltage battery 11 shown specifically includes a first battery pack 111 and a second battery pack 112, wherein the first battery pack 111 can be used to bear the peak output power of the high-voltage battery 11, and has a higher power density and a higher discharge rate, so the power density of the first battery pack 111 is greater than the power density of the second battery pack 112. The second battery pack 112 can be used to bear the main energy storage capacity of the high-voltage battery 11, and has a higher energy density and can store more energy, so the energy density of the second battery pack 112 is greater than the energy density of the first battery pack 111.

[0043] When the voltage conversion circuit 102 works in the power control mode, the control circuit 100 can specifically control the voltage conversion circuit 102 according to the power demand of the first power-consuming device 14 or the power of the first battery pack 111, so that the first battery pack 111 and the second battery pack 112 in the high-voltage battery 11 are in different charge and discharge states, and power is supplied to the first power-consuming device 14 with different target output powers. The voltage conversion circuit 102 can achieve three different working states, respectively:

[0044] Working state 7: the second battery pack 112 supplies power to the first power-consuming device 14 through the voltage conversion circuit 102 .

[0045] Working state 8: the first battery pack 111 and the second battery pack 112 jointly supply power to the first power-consuming device 14 through the voltage conversion circuit 102 .

[0046] Working state 9: the second battery pack 112 discharges to the first battery pack 111 through the voltage conversion circuit 102 , thereby charging the first battery pack 111 .

[0047] In one embodiment, when the power demand of the first power-consuming device 14 is less than or equal to the preset power, it means that the power demand of the first power-consuming device 14 is not large, and the power demand of the first power-consuming device 14 can be met by using the second battery pack 112 with a lower power density. Therefore, the control circuit 100 controls the voltage conversion circuit 102 to work in working state 7, so that the second battery pack 112 supplies power to the first power-consuming device 14. When the power of the first power-consuming device 14 is greater than the preset power, it means that the power demand of the first power-consuming device 14 is large, and the power demand of the first power-consuming device 14 needs to be met by using the first battery pack 111 with a higher power density in combination with the second battery pack 112. Therefore, the control circuit 100 controls the voltage conversion circuit 102 to work in working state 8, so that the first battery pack 111 and the second battery pack 112 supply power to the first power-consuming device 14 together.

[0048] In one embodiment, when the power of the first battery pack 111 is less than the preset power, it means that the first battery pack 111 needs to be charged, and the control circuit 100 controls the voltage conversion circuit 102 to operate in working state 8, so that the second battery pack 112 charges the first battery pack 111.

[0049] In summary, the on-board charger 10 provided in this embodiment can realize a total of 9 different working states based on two working modes, thereby realizing more working states based on different working modes, further enriching and refining the functions that the on-board charger 10 can realize, and further improving the integration and intelligence of the on-board charger 10.

[0050] At the same time, the high-voltage battery 11 provided in this embodiment supports multiple different output powers through the setting of the first battery pack 111 and the second battery pack 112, so that the high-voltage battery 11 as a whole has a higher power density. Combined with the control of the voltage conversion circuit 102 by the control circuit 100, the high-voltage battery 11 can not only meet the energy density requirements, but also guarantee the power to a certain extent and increase the battery life.

[0051] The on-board charger 10 provided in this embodiment can be connected to different battery packs, so that batteries of different life systems and different chemical systems can be shared, so that the high-voltage battery 11 is not constrained by the energy density and power density of the battery cell, and is electrically connected through a relatively simple circuit topology, so that the potential capacity of the entire high-voltage battery 11 can be fully utilized through the joint control of multiple battery packs.

[0052] Figure 3 The structure of the voltage conversion circuit provided in this application is shown as follows: Figure 3 The voltage conversion circuit 102 shown can be applied to Figure 2 In the vehicle-mounted charger 10 shown.

[0053] Specifically, Figure 3 The voltage conversion circuit 102 shown includes: a first voltage conversion module 1021, a transformer 1020, a second voltage conversion module 1022 and a third voltage conversion module 1023. The transformer 1020 includes a primary winding, a first secondary winding and a second secondary winding. The first voltage conversion module 1021 is respectively connected to the PFC circuit 101 and the primary winding, the second voltage conversion module 1022 is respectively connected to the first secondary winding, the first battery pack 111 of the high-voltage battery 11, the second battery pack and the internal load 14, and the third DC / DC module 1023 is respectively connected to the second secondary winding and the low-voltage battery 12.

[0054] Furthermore, the voltage conversion circuit 102 provided in the present application can realize a vehicle charger mode for converting the voltage between the PFC circuit 101 and at least one energy storage device, and a power control mode for controlling the power supplied by at least one energy storage device to the first power-consuming device 14. Figure 3 In the voltage conversion circuit 102 shown, the second voltage conversion module 1022 includes two functional units, a voltage conversion unit and a power supply unit, and components can be reused between the two functional units. For example, the voltage conversion unit and the power supply unit can reuse at least two bridge arms.

[0055] Among them, when the voltage conversion circuit 102 is in the vehicle charger mode, the voltage conversion unit of the second voltage conversion module 1022 can be used to convert the alternating current of the first secondary winding and the direct current between the high-voltage battery 11, and the power supply unit is in a non-working state at this time; when the voltage conversion circuit 102 is in the power control mode, the power supply unit of the second voltage conversion module 1022 can be used to control the power supplied by the high-voltage battery 11 to the first electrical equipment 14, and the voltage conversion unit is in a non-notification state at this time.

[0056] Therefore, the voltage conversion circuit 102 provided in this embodiment combines the on-board charger mode and the power control mode supported by the voltage conversion circuit 102 through the reuse of the second voltage conversion module 1022, and combines them in the same conversion module, thereby effectively improving the integration of the on-board charger and enriching the functions without significantly increasing the design complexity and cost of the circuit.

[0057] Figure 4 A schematic diagram of the circuit structure of the first voltage conversion module provided in this application, such as Figure 4 Shows Figure 3 A specific implementation of the first voltage conversion module 1021 in the voltage conversion circuit 102 shown. Specifically, the first voltage conversion module 1021 includes: a first switch K4, a first resonant capacitor Cr1, a first resonant inductor Lr1, a first bridge arm and a second bridge arm, the first bridge arm includes an upper bridge arm Q5 and a lower bridge arm Q7, and the second bridge arm includes an upper bridge arm Q6 and a lower bridge arm Q8. Among them, the first bridge arm, the first switch K4, the primary winding 1220a, the first resonant capacitor Cr1 and the second bridge arm are connected in sequence.

[0058] In one embodiment, if Figure 4 The PFC circuit shown includes: capacitor L1, inductor C1, inductor C2, fourth switch K1, fifth switch K2, sixth switch K3, seventh bridge arm and eighth bridge arm, the seventh bridge arm includes upper bridge arm Q1 and lower bridge arm Q3, the eighth bridge arm includes upper bridge arm Q2 and lower bridge arm Q4. The fourth switch K1 is used to connect to the grid 2, which is connected to the grid 2 at Figure 4The fifth switch K2 is used to connect the external second power-consuming device 3. Figure 4 The sixth switch K3 is equivalent to the resistor R1, and is used to connect the capacitor C1. After the voltage source Vin, the resistor R1 and the capacitor C1 are connected in parallel, they are sequentially connected to the capacitor L1, the seventh bridge arm, the inductor C2, and the eighth bridge arm.

[0059] Figure 5 A schematic diagram of the circuit structure of the second voltage conversion module provided in this application, such as Figure 5 Shows Figure 3 A specific implementation of the second voltage conversion module 1022 in the voltage conversion circuit 102 shown. Specifically, the second voltage conversion module 1022 includes: a second switch K5, a second resonant capacitor Cr2, a second resonant inductor Lr2, a first control switch K10, a second control switch K9, a third control switch K7, a fourth control switch K8, a capacitor C3, a first inductor Boost1, a second inductor Boost2, a third inductor Boost3, a third bridge arm and a fourth bridge arm, the third bridge arm includes an upper bridge arm Q9 and a lower bridge arm Q11, and the fourth bridge arm includes an upper bridge arm Q10 and a lower bridge arm Q12.

[0060] Among them, the second switch K5, the second resonant inductor Lr2, the middle point of the third bridge arm, the confluence point of the two ends of the third bridge arm, the first control switch K10, the first battery pack 111 and the second battery pack 112 of the high-voltage battery 11, the confluence point of the two ends of the fourth bridge arm, the second resonant capacitor Cr2 and the second secondary winding 1220b are connected in sequence. At the same time, the first electrical device 14, the capacitor C3, the third bridge arm and the fourth bridge arm are connected in parallel in sequence, the second control switch K9 is set between the capacitor C3 and the third bridge arm, the middle point of the third bridge arm is connected to the first battery pack 111 and the second battery pack 112 of the high-voltage battery 11 through the fourth control switch K8 and the second inductor Boost2, the middle point of the fourth bridge arm is connected to the first battery pack 111 and the second battery pack 112 of the high-voltage battery 11 through the third control switch K7 and the first inductor Boost1, and the third inductor Boost3 and the first control switch K10 are connected in parallel and are set between the fourth bridge arm and the positive electrode of the first battery pack 111.

[0061] When the voltage conversion circuit 102 is in the on-board charger mode, the second switch K5, the second resonant capacitor Cr2, the second resonant inductor Lr2, the first control switch K10, the third bridge arm and the fourth bridge arm in the second voltage conversion module 1022 form a voltage conversion unit. When the voltage conversion circuit 102 is in the power control mode, the third bridge arm, the fourth bridge arm, the capacitor C3, the second control switch K9, the third control switch K7, the fourth control switch K8, the first inductor Boost1, the second inductor Boost2 and the third inductor Boost3 in the second voltage conversion module 1022 form a power supply unit.

[0062] Figure 6 A schematic diagram of the circuit structure of the third voltage conversion module provided in this application, such as Figure 6 Shows Figure 3 A specific implementation of the third voltage conversion module 1023 in the voltage conversion circuit 102 shown. Specifically, the third voltage conversion module 1023 includes: a third switch K6, a fourth resonant capacitor Cr3, a third resonant inductor Lr3, a fifth bridge arm and a sixth bridge arm, the fifth bridge arm includes an upper bridge arm Q13 and a lower bridge arm Q15, and the sixth bridge arm includes an upper bridge arm Q14 and a lower bridge arm Q16. Among them, the third switch K5, the third resonant inductor Lr3, the fifth bridge arm, the low-voltage battery 12, the sixth bridge arm, the third resonant capacitor Cr3 and the second secondary winding 1220c are connected in sequence.

[0063] Combination Figure 4 , Figure 5 and Figure 6 As shown in the circuit structure of the complete voltage conversion circuit 102, the control circuit 100 can specifically control different bridge arms in the voltage conversion circuit 102 to control the voltage conversion circuit 102 to work in different modes and be in different working states in different modes.

[0064] In one embodiment, the control circuit 100 specifically controls the second switch K5 and the first control switch K10 to be turned on, and controls the second control switch K7, the third control switch K8 and the fourth control switch K9 to be turned off, so that the voltage conversion circuit 102 operates in the vehicle charger mode.

[0065] In one embodiment, the control circuit 100 specifically controls the second switch K5 and the first control switch K10 to be disconnected, and controls the second control switch K7, the third control switch K8 and the fourth control switch K9 to be turned on, so that the voltage conversion circuit 102 operates in the power control mode.

[0066] More specifically, when the voltage conversion circuit 102 operates in the vehicle charger mode:

[0067] The control circuit 100 specifically controls the third switch K6 to be disconnected, controls the first switch K4 and the third switch K5 to be turned on, controls the fourth switch K1 in the PFC circuit 101 to be turned on, and controls the fifth switch K2 and the sixth switch K3 to be disconnected, thereby controlling the first bridge arm, the second bridge arm, the seventh bridge arm and the eighth bridge arm, so that the voltage conversion circuit 102 operates in the working state 1.

[0068] The control circuit 100 specifically controls the second switch K5 to be disconnected, controls the first switch K4 and the third switch K5 to be turned on, controls the fourth switch K1 in the PFC circuit 101 to be turned on, and controls the fifth switch K2 and the sixth switch K3 to be disconnected, thereby controlling the first bridge arm, the second bridge arm, the seventh bridge arm and the eighth bridge arm, so that the voltage conversion circuit 102 operates in the working state 2.

[0069] The control circuit 100 specifically controls the third switch K6 to be disconnected, controls the first switch K4 and the second switch K5 to be turned on, controls the fourth switch K1 in the PFC circuit 101 to be turned on, and controls the fifth switch K2 and the sixth switch K3 to be disconnected, thereby controlling the upper bridge arm of the third bridge arm and the upper bridge arm of the fourth bridge arm, so that the voltage conversion circuit 102 operates in the working state 3.

[0070] The control circuit 100 specifically controls the first switch K4 to be disconnected, controls the second switch K5 and the third switch K6 to be turned on, and controls the fourth switch K1 in the PFC circuit 101 to be disconnected, controls the fifth switch K2 and the sixth switch K3 to be turned on, thereby controlling the upper bridge arm of the third bridge arm and the upper bridge arm of the fourth bridge arm, so that the voltage conversion circuit 102 operates in the working state 4.

[0071] The control circuit 100 specifically controls the first switch K4 to be turned off, and controls the second switch K5 and the third switch K6 to be turned on, thereby controlling the third bridge arm and the fourth bridge arm to make the voltage conversion circuit 102 work in the working state 5.

[0072] The control circuit 100 specifically controls the first switch K4 to be turned off, and controls the second switch K5 and the third switch K6 to be turned on, thereby controlling the fifth bridge arm and the sixth bridge arm to make the voltage conversion circuit 102 work in the working state 6.

[0073] More specifically, when the voltage conversion circuit 102 operates in the power control mode:

[0074] The control circuit 100 specifically controls the third bridge arm and the fourth bridge arm to be alternately turned on and off according to the first switching frequency, so that the second battery pack 112 supplies power to the first electrical device 14 through the third bridge arm and the fourth bridge arm, and the voltage conversion circuit 102 operates in working state 7.

[0075] The control circuit 100 specifically controls the upper bridge arm Q9 of the third bridge arm and the lower bridge arm Q12 of the fourth bridge arm to be turned on, so that the first battery pack 111 and the second battery pack 112 are connected in series, and then power is supplied to the first electrical device 14 through the third bridge arm and the fourth bridge arm, so that the voltage conversion circuit 102 operates in working state 8.

[0076] The control circuit 100 specifically controls the third bridge arm and the fourth bridge arm to be alternately turned on and off according to the second switching frequency, so that the second battery pack 112 charges the first battery pack 111 through the third bridge arm and the fourth bridge arm, and the voltage conversion circuit 102 operates in working state 9.

[0077] In summary, the control circuit 100 controls the switches and bridge arms in the voltage conversion circuit 102 so that the voltage conversion circuit 102 can operate in at least 9 different working states, which greatly enriches the functions of the voltage conversion circuit 102 and the on-board charger 10 in which it is located. The control logic of the control circuit 100 is also relatively simple and efficient, which can reduce the time cost and computing power cost required for the control circuit 100, and is conducive to the application and promotion of the on-board charger 10 provided in this application and the control method executed by the control circuit 100.

[0078] In a specific implementation, the control circuit 100 can control the voltage conversion circuit 102 to operate in different operating modes according to instructions from other devices or users of the electric vehicle. Alternatively, the control circuit 100 can also control the voltage conversion circuit 102 to operate in different operating modes according to advance configurations when certain preset conditions are met, so as to improve the degree of automation and intelligence of the control method.

[0079] In addition, the present application also provides another implementation of the voltage conversion circuit 102, wherein the structure of the another voltage conversion circuit 102 is similar to Figure 3 The first voltage conversion module 1021 , the transformer and the third voltage conversion module 1023 are the same as shown, and the difference lies in the second voltage conversion module 1022 .

[0080] Specifically, Figure 7 A schematic diagram of the circuit structure of another voltage conversion circuit provided in this application is shown in FIG. Figure 7 The second voltage conversion module 1022 shown includes: a second switch K5, a second resonant capacitor Cr2, a second resonant inductor Lr2, a capacitor C3, a third bridge arm and a fourth bridge arm, the third bridge arm includes an upper bridge arm Q9 and a lower bridge arm Q11, and the fourth bridge arm includes an upper bridge arm Q10 and a lower bridge arm Q12. Among them, the second switch K5, the second resonant inductor Lr2, the midpoint of the third bridge arm, the confluence point of the two ends of the third bridge arm, the high-voltage battery 11, the confluence point of the two ends of the fourth bridge arm, the second resonant capacitor Cr2 and the second secondary winding 1220b are connected in sequence.

[0081] By Figure 4 , Figure 6 and Figure 7 The formed voltage conversion circuit 102 can also be controlled by the control circuit 100 to operate in any one of working state 1, working state 2, working state 3, working state 4, working state 5 or working state 6.

[0082] Based on the aforementioned Figure 5 The second voltage conversion module 1022 provided in the embodiment shown integrates a voltage conversion unit and a power supply unit in the second voltage conversion module 1022 to realize different working modes respectively. The power supply unit for controlling power in the power control mode can also exist in a separate circuit form.

[0083] For example, Figure 8 A schematic diagram of a circuit structure of a power control circuit provided in this application, such as Figure 8 The power control circuit shown includes: a first battery pack 111, a second battery pack 112, a capacitor C3, a third control switch K7, a fourth control switch K8, a first inductor Boost1, a second inductor Boost2, a third inductor Boost3, a third bridge arm and a fourth bridge arm, the third bridge arm includes an upper bridge arm Q9 and a lower bridge arm Q11, the fourth bridge arm includes an upper bridge arm Q10 and a lower bridge arm Q12, and R is the equivalent load of the battery.

[0084] The battery load, capacitor C3, third bridge arm and fourth bridge arm are connected in parallel in sequence, the midpoint of the third bridge arm is connected between the first battery pack 111 and the second battery pack 112 through the fourth control switch K8 and the second inductor Boost2, the midpoint of the fourth bridge arm is connected between the first battery pack 111 and the second battery pack 112 through the third control switch K7 and the first inductor Boost1, and the third inductor Boost3 is arranged between the fourth bridge arm and the positive electrode of the first battery pack 111.

[0085] like Figure 8The control circuit of the power control circuit shown can control the states of the third control switch K7, the fourth control switch K8, the third bridge arm and the fourth bridge arm to enable the power control circuit to achieve different working states. For example, the control circuit specifically controls the third bridge arm and the fourth bridge arm to be alternately turned on and off according to the first switching frequency, so that the third bridge arm and the fourth bridge arm of the second battery pack 112 supply power to the first power device 14. The control circuit 100 specifically controls the upper bridge arm Q9 of the third bridge arm and the lower bridge arm Q12 of the fourth bridge arm to be turned on, so that the first battery pack 111 and the second battery pack 112 are connected in series, and then supply power to the first power device 14 through the third bridge arm and the fourth bridge arm. The control circuit 100 specifically controls the third bridge arm and the fourth bridge arm to be alternately turned on and off according to the second switching frequency, so that the second battery pack 112 charges the first battery pack 111 through the third bridge arm and the fourth bridge arm.

[0086] Finally, it should be noted that in the aforementioned embodiments of the present application, the structure and different working modes and working states of the on-board charger 10 provided in the embodiments of the present application are introduced, and in order to realize the control of each working mode and working state in the on-board charger 10 provided in the above embodiments of the present application, the control circuit 100 as the execution subject can be implemented by hardware structure and / or software module, for example, in the form of hardware structure, software module, or hardware structure plus software module to realize the above functions. Whether one of the above functions is executed in the form of hardware structure, software module, or hardware structure plus software module depends on the specific application and design constraints of the technical solution.

[0087] In the above embodiments, the control performed by the control circuit 100 can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0088] For example, the present application also provides a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are executed, they can be used to implement the control method or steps performed by any control circuit 100 in the aforementioned embodiments of the present application.

[0089] An embodiment of the present application also provides a chip for executing instructions, wherein the chip is used to execute a control method or step as executed by any control circuit 100 described above in the present application.

[0090] An embodiment of the present application further provides a computer program product, including a computer program, which, when executed, implements the control method or steps performed by any control circuit 100 described above in the present application.

[0091] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A vehicle-mounted charger, characterized in that: include: A PFC circuit, connected to a power grid and a voltage conversion circuit respectively; The voltage conversion circuit is respectively connected to the PFC circuit, the first power-consuming device and at least one energy storage device; A control circuit is used to control the voltage conversion circuit to operate in a vehicle charger mode for converting the voltage between the PFC circuit and the at least one energy storage device, or in a power control mode for controlling the power supplied by the at least one energy storage device to the first electrical device.

2. The vehicle-mounted charger according to claim 1, characterized in that: The at least one energy storage device includes a high-voltage battery; when the voltage conversion circuit operates in the power control mode, the control circuit is specifically used for: By controlling the voltage conversion circuit, the high-voltage battery supplies power to the first power-consuming device at a target output power among a plurality of output powers supported by the high-voltage battery.

3. The vehicle-mounted charger according to claim 2, characterized in that: The control circuit is specifically used for: According to the power demand of the first electric device, the voltage conversion circuit is controlled so that the high-voltage battery supplies power to the first electric device at the target output power.

4. The vehicle-mounted charger according to claim 3, characterized in that: The high-voltage battery includes a first battery pack and a second battery pack; wherein the power density of the first battery pack is greater than the power density of the second battery pack, and the energy density of the second battery pack is greater than the energy density of the first battery pack.

5. The vehicle-mounted charger according to claim 4, characterized in that: The control circuit is specifically used for: When the power demand of the first power-consuming device is less than or equal to a preset power, controlling the voltage conversion circuit so that the second battery pack supplies power to the first power-consuming device; When the power demand of the first power-consuming device is greater than the preset power, the voltage conversion circuit is controlled so that the first battery pack and the second battery pack jointly supply power to the first power-consuming device.

6. The vehicle-mounted charger according to claim 4 or 5, characterized in that: The control circuit is also used for: When the power of the first battery pack is less than a preset power, the voltage conversion circuit is controlled to allow the second battery pack to charge the first battery pack.

7. The vehicle-mounted charger according to any one of claims 2 to 6, characterized in that: The at least one energy storage device further includes a low-voltage battery. When the voltage conversion circuit operates in the on-board charger mode, the control circuit is specifically configured to: Control the voltage conversion circuit to enable the grid to charge the high-voltage battery, or to enable the grid to charge the low-voltage battery, or to enable the high-voltage battery to supply power to the grid, or to enable the high-voltage battery to supply power to a second electrical device, or to enable the high-voltage battery to charge the low-voltage battery, or to enable the low-voltage battery to charge the high-voltage battery.

8. The vehicle-mounted charger according to claim 7, characterized in that: The voltage conversion circuit comprises: A transformer, comprising a primary winding, a first secondary winding and a second secondary winding; A first voltage conversion module, connected to the PFC circuit and the primary winding respectively; a second voltage conversion module, connected to the first secondary winding, the high voltage battery and an internal load respectively; The third voltage conversion module is connected to the second secondary winding and the low-voltage battery respectively.

9. The vehicle-mounted charger according to claim 8, characterized in that: The second voltage conversion module includes: a voltage conversion unit, used for converting the alternating current of the first secondary winding and the direct current of the high-voltage battery; A power supply unit is used to control the power supplied by the high-voltage battery to the first electrical device.

10. The vehicle-mounted charger according to claim 9, characterized in that: The voltage conversion unit comprises: A second switch, a second resonant capacitor, a second resonant inductor, a first control switch, a third bridge arm and a fourth bridge arm; Among them, the second switch, the second resonant inductor, the midpoint of the third bridge arm, the confluence point of the two ends of the third bridge arm, the first control switch, the high-voltage battery, the confluence point of the two ends of the fourth bridge arm, the second resonant capacitor and the second secondary winding are connected in sequence.

11. The vehicle-mounted charger according to claim 10, characterized in that: The power supply unit comprises: The third bridge arm, the fourth bridge arm, a capacitor, a second control switch, a third control switch, a fourth control switch, a first inductor, a second inductor and a third inductor; Among them, the first electrical device, the capacitor, the third bridge arm and the fourth bridge arm are connected in parallel in sequence, the second control switch is arranged between the capacitor and the third bridge arm, the midpoint of the third bridge arm is connected to between the first battery pack and the second battery pack through the fourth control switch and the second inductor, the midpoint of the fourth bridge arm is connected to between the first battery pack and the second battery pack through the third control switch and the first inductor, and the third inductor and the first control switch are connected in parallel and arranged between the fourth bridge arm and the positive electrode of the first battery pack.

12. The vehicle-mounted charger according to claim 11, characterized in that: The control circuit is specifically used for: The third bridge arm and the fourth bridge arm are controlled according to the first switching frequency, so that the second battery pack supplies power to the first electrical device through the third bridge arm and the fourth bridge arm.

13. The vehicle-mounted charger according to claim 11, characterized in that: The control circuit is specifically used for: The upper bridge arm of the third bridge arm and the lower bridge arm of the fourth bridge arm are controlled to be turned on, so that after the first battery pack and the second battery pack are connected in series, power is supplied to the first electrical device through the third bridge arm and the fourth bridge arm.

14. The vehicle-mounted charger according to claim 11, characterized in that: The control circuit is specifically used for: The third bridge arm and the fourth bridge arm are controlled according to a second switching frequency, so that the second battery pack charges the first battery pack through the third bridge arm and the fourth bridge arm.

15. The vehicle-mounted charger according to any one of claims 10 to 14, characterized in that: The first voltage conversion module comprises: A first switch, a first resonant capacitor, a first resonant inductor, a first bridge arm and a second bridge arm; The first bridge arm, the first resonant inductor, the first switch, the primary winding, the first resonant capacitor and the second bridge arm are connected in sequence.

16. The vehicle-mounted charger according to claim 15, characterized in that: The third voltage conversion module comprises: a third switch, a third resonant capacitor, a third resonant inductor, a fifth bridge arm and a sixth bridge arm; Among them, the third switch, the third resonant inductor, the fifth bridge arm, the low-voltage battery, the sixth bridge arm, the third resonant capacitor and the second secondary winding are connected in sequence.

17. The vehicle-mounted charger according to claim 16, characterized in that: The control circuit is specifically used for: The second switch and the first control switch are controlled to be turned on, and the second control switch, the third control switch and the fourth control switch are controlled to be turned off, so that the voltage conversion circuit operates in a vehicle charger mode.

18. The vehicle-mounted charger according to claim 16, characterized in that: The control circuit is specifically used for: The second switch and the first control switch are controlled to be disconnected, and the second control switch, the third control switch and the fourth control switch are controlled to be turned on, so that the voltage conversion circuit operates in a power control mode.

19. The vehicle-mounted charger according to claim 17 or 18, characterized in that: The control circuit is specifically used for: The third switch is controlled to be disconnected, the first switch and the third switch are controlled to be turned on, and the first bridge arm and the second bridge arm are controlled, so that the grid charges the high-voltage battery.

20. The vehicle-mounted charger according to claim 17 or 18, characterized in that: The control circuit is specifically used for: The second switch is controlled to be disconnected, the first switch and the second switch are controlled to be turned on, and the first bridge arm and the second bridge arm are controlled, so that the grid charges the low-voltage battery.

21. The vehicle-mounted charger according to claim 17 or 18, characterized in that: The control circuit is specifically used for: The third switch is controlled to be disconnected, the first switch and the second switch are controlled to be turned on, and the upper bridge arm of the third bridge arm and the upper bridge arm of the fourth bridge arm are controlled, so that the high-voltage battery supplies power to the power grid.

22. The vehicle-mounted charger according to claim 17 or 18, characterized in that: The control circuit is specifically used for: The first switch and the second switch are controlled to be turned on, and the upper bridge arm of the third bridge arm and the upper bridge arm of the fourth bridge arm are controlled, so that the high-voltage battery supplies power to the second electrical device.

23. The vehicle-mounted charger according to claim 17 or 18, characterized in that: The control circuit is specifically used for: The first switch is controlled to be disconnected, the second switch and the third switch are controlled to be turned on, and the third bridge arm and the fourth bridge arm are controlled, so that the high-voltage battery charges the low-voltage battery.

24. The vehicle-mounted charger according to claim 17 or 18, characterized in that: The control circuit is specifically used for: The first switch is controlled to be disconnected, the second switch and the third switch are controlled to be turned on, and the fifth bridge arm and the sixth bridge arm are controlled, so that the low-voltage battery charges the high-voltage battery.

25. An electric vehicle, characterized in that: It comprises the on-board charger as described in any one of claims 1-24.

26. A power control circuit, characterized in that: include: A first battery pack, a second battery pack, a third bridge arm, a fourth bridge arm, a capacitor, a third control switch, a fourth control switch, a first inductor, a second inductor, and a third inductor; Among them, the load, the capacitor, the third bridge arm and the fourth bridge arm are connected in parallel in sequence, the midpoint of the third bridge arm is connected to between the first battery pack and the second battery pack through the fourth control switch and the second inductor, the midpoint of the fourth bridge arm is connected to between the first battery pack and the second battery pack through the third control switch and the first inductor, and the third inductor is arranged between the fourth bridge arm and the positive electrode of the first battery pack.

27. A control method for a vehicle charger, characterized in that: The on-board charger includes a PFC circuit and a voltage conversion circuit, the PFC circuit is connected to the power grid and the voltage conversion circuit respectively, and the voltage conversion circuit is connected to the PFC circuit, the first power-consuming device and at least one energy storage device respectively; the control method includes: The voltage conversion circuit is controlled to operate in a vehicle charger mode for converting the voltage between the PFC circuit and the at least one energy storage device, or in a power control mode for controlling the power supplied by the at least one energy storage device to the first electrical device.

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