Method for Controlling an On-Board Charger, On-Board Charger, and Vehicle

Abstract

The present invention discloses a method for controlling an on-vehicle charger, an on-vehicle charger, and a vehicle. The method for controlling the on-vehicle charger includes: obtaining an output current value of a DCDC module, a first output voltage value on a bus capacitor, a second output voltage value of a resonant circuit, a grid voltage value, and a grid current value; controlling a PFC module according to the output current value of the DCDC module, the grid current value, the grid voltage value, and the first output voltage value, so that the output current value of the DCDC module is within a target current value range; controlling the DCDC module according to the first output voltage value or the second output voltage value, so that the first output voltage value is within a target voltage value range. By adopting this method, the capacitance value of the bus capacitor can be reduced while ensuring the normal function of the on-vehicle charger, and the purpose of replacing an electrolytic capacitor with a smaller bus capacitor such as a thin-film capacitor can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular, to a method for controlling an on-vehicle charger, an on-vehicle charger, and a vehicle. Background Art

[0002] An on-vehicle charger is a power supply system that converts alternating current into direct current, and is used as an on-vehicle charging device for a vehicle to charge a battery pack of the vehicle.

[0003] In related technologies, an on-vehicle charger usually adopts a two-stage topology, with a PFC (Power Factor Correction) circuit in the front stage and a DCDC circuit in the rear stage. A relatively large-capacity electrolytic capacitor is selected as the bus capacitor between the two-stage circuits to balance the instantaneous power difference between the AC side and the DC side. However, the electrolytic capacitor has a short working life and poor high-temperature resistance, and is not suitable for the harsh working environment inside the vehicle. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide a method for controlling an on-vehicle charger. By using this method, the capacitance value of the bus capacitor can be reduced while ensuring the normal function of the on-vehicle charger, and the purpose of replacing the electrolytic capacitor with a smaller bus capacitor such as a thin-film capacitor can be achieved.

[0005] A second object of the present invention is to provide an on-vehicle charger.

[0006] A third object of the present invention is to provide a vehicle.

[0007] To solve the above problems, a method for controlling an on-vehicle charger according to an embodiment of the first aspect of the present invention, the on-vehicle charger includes a PFC module, a bus capacitor, and a DCDC module, the DCDC module includes a resonant circuit, and an input end of the resonant circuit is connected to an output end of the bus capacitor. The method includes: obtaining an output current value of the DCDC module, a first output voltage value on the bus capacitor, a second output voltage value of the resonant circuit, a grid voltage value, and a grid current value; controlling the PFC module according to the output current value of the DCDC module, the grid current value, the grid voltage value, and the first output voltage value, so that the output current value of the DCDC module is within a target current value range; controlling the DCDC module according to the first output voltage value or the second output voltage value, so that the first output voltage value is within a target voltage value range.

[0008] A method for controlling an on-vehicle charger according to an embodiment of the present invention controls a PFC module based on the output current value, grid current value, grid voltage value, and first output voltage value of a DCDC module, that is, adjusts the active power on the AC side of the on-vehicle charger through the output quantity on the DC side in the on-vehicle charger, so that the output current value of the DCDC module is within the target current value range, thereby playing a role in balancing the instantaneous power difference between the AC side and the DC side in the on-vehicle charger. In addition, the DCDC module is controlled by the first output voltage value or the second output voltage value to control the first output voltage value within the target voltage value range, so that the DCDC module can operate at a fixed gain, ensuring the normal operation of the on-vehicle charger and avoiding the problem of device damage. Thus, through the above control method, the effect of balancing the instantaneous power difference between the AC side and the DC side in the on-vehicle charger can be achieved while ensuring the normal function of the on-vehicle charger, thereby reducing the capacity requirement of the bus capacitor at the output end of the PFC module, reducing the capacitance value of the bus capacitor, and achieving the purpose of replacing the electrolytic capacitor with a smaller bus capacitor such as a thin film capacitor.

[0009] In some embodiments, controlling the DCDC module according to the first output voltage value or the second output voltage value to make the first output voltage value within the target voltage value range includes: when the first output voltage value is greater than the upper voltage limit value of the target voltage value range, reducing the switching frequency of the switching tube in the resonant circuit; when the first output voltage value is less than the lower voltage limit value of the target voltage value range, increasing the switching frequency of the switching tube in the resonant circuit.

[0010] In some embodiments, the DCDC module further includes a BUCK circuit, the input end of the BUCK circuit is connected to the output end of the resonant circuit, and controlling the DCDC module according to the first output voltage value or the second output voltage value to make the first output voltage value within the target voltage value range includes: when the second output voltage value is greater than the upper voltage limit value of the target voltage value range, reducing the duty cycle of the control signal of the switching tube in the BUCK circuit; when the second output voltage value is less than the lower voltage limit value of the target voltage value range, increasing the duty cycle of the control signal of the switching tube in the BUCK circuit.

[0011] In some embodiments, the method further includes: controlling the resonant circuit to operate in an open-loop mode, where the switching frequency of the resonant circuit in the open-loop mode is the resonant frequency.

[0012] In some embodiments, the output current of the resonant circuit is the output current of the DCDC module, or the output current of the BUCK circuit is the output current of the DCDC module;

[0013] Control the PFC module according to the output current value, grid current value, grid voltage value of the DCDC module and the first output voltage value, so that the output current value of the DCDC module is within the target current value range, including: obtaining an AC current difference according to the output current value of the DCDC module, the target current value within the target current value range and the grid voltage value, and obtaining a first modulation value according to the AC current difference and the grid current value; performing a division operation on the grid voltage value and the first output voltage value to obtain a second modulation value; obtaining a PFC control signal according to the first modulation value and the second modulation value to control the PFC module.

[0014] In some embodiments, obtaining an AC current difference according to the output current value of the DCDC module, the target current value within the target current value range and the grid voltage value, and obtaining a first modulation value according to the AC current difference and the grid current value, includes: performing a subtraction operation on the output current value of the DCDC module and the target current value to obtain a DC current difference; extracting the phase value of the grid voltage value; performing a multiplication operation on the DC current difference and the phase value to obtain the AC current difference; performing a subtraction operation on the AC current difference and the grid current value to obtain the first modulation value.

[0015] An embodiment of the second aspect of the present invention provides an on-vehicle charger, including: a PFC module for performing power factor correction on an input AC signal; a bus capacitor connected to the PFC module; a DCDC module including a resonant circuit, the input end of the resonant circuit is connected to the bus capacitor, and the DCDC module is used to convert the AC signal into an electrical signal required by the battery; a control module connected to the PFC module and the DCDC module, and used to control the PFC module and the DCDC module according to the method for controlling the on-vehicle charger described in the above embodiments.

[0016] According to the on-vehicle charger of the embodiment of the present invention, the control module controls the PFC module and the DCDC module by using the method for controlling the on-vehicle charger provided in the above embodiments, which can reduce the capacitance value of the bus capacitor while ensuring the normal function of the on-vehicle charger, and achieve the purpose of using a smaller bus capacitor such as a thin film capacitor to replace the electrolytic capacitor.

[0017] In some embodiments, the bus capacitor is a thin film capacitor.

[0018] In some embodiments, the DCDC module further includes a BUCK circuit, the input end of the BUCK circuit is connected to the output end of the resonant circuit, and is used to convert the electrical signal output by the resonant circuit into an electrical signal required by the battery.

[0019] The third aspect embodiment of the present invention provides a vehicle, including: a battery; the on-vehicle charger described in the above embodiment, the on-vehicle charger is connected to the battery; a detection device, the detection device is connected to the on-vehicle charger, and is used to detect the current signal, voltage signal and grid electrical signal in the on-vehicle charger.

[0020] For the vehicle according to the embodiment of the present invention, by adopting the on-vehicle charger provided in the above embodiment, the capacitance value of the bus capacitor can be reduced while ensuring the normal function of the on-vehicle charger, so as to achieve the purpose of using a smaller bus capacitor such as a film capacitor to replace the electrolytic capacitor.

[0021] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0022] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0023] Figure 1 is a schematic structural diagram of an on-vehicle charger according to an embodiment of the present invention;

[0024] Figure 2 is a flowchart of a method for controlling an on-vehicle charger according to an embodiment of the present invention;

[0025] Figure 3 is a schematic circuit diagram of an on-vehicle charger according to an embodiment of the present invention;

[0026] Figure 4 is a schematic circuit diagram of an on-vehicle charger according to another embodiment of the present invention;

[0027] Figure 5 is a schematic control flow diagram of a method for controlling an on-vehicle charger according to an embodiment of the present invention;

[0028] Figure 6 is a schematic structural diagram of an on-vehicle charger according to another embodiment of the present invention;

[0029] Figure 7 is a schematic control flow diagram of a method for controlling an on-vehicle charger according to an embodiment of the present invention;

[0030] Figure 8 is a structural block diagram of a vehicle according to an embodiment of the present invention.

[0031] Reference Signs:

[0032] On-vehicle charger 10; Vehicle 20;

[0033] PFC module 1; bus capacitor C0; DCDC module 2; control module 3; resonant circuit 21; BUCK circuit 22; battery 4; detection device 5. Specific Embodiments

[0034] Embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention will be described in detail below.

[0035] In related technologies, the capacitance requirement of the bus capacitor in an on-vehicle charger is large. For example, electrolytic capacitors are usually used, but they have poor high-temperature resistance, large ESR (Equivalent Series Resistance), poor overall efficiency of the machine, and high cost.

[0036] To solve the above problems, an embodiment of the first aspect of the present invention provides a method for controlling an on-vehicle charger. By using this method, the capacitance value of the bus capacitor can be reduced while ensuring the normal function of the on-vehicle charger, achieving the purpose of replacing electrolytic capacitors with smaller bus capacitors such as thin-film capacitors.

[0037] In some embodiments, as Figure 1 shown, the on-vehicle charger 10 includes a PFC module 1, a bus capacitor C0, and a DCDC module 2. The DCDC module 2 includes a resonant circuit 21, and the input end of the resonant circuit 21 is connected to the output end of the bus capacitor C0.

[0038] Figure 2 Shown is a flowchart of the method for controlling an on-vehicle charger according to an embodiment of the present invention. As Figure 2 shown, the method at least includes step S1-step S3.

[0039] Step S1, obtain the output current value of the DCDC module, the first output voltage value on the bus capacitor, the second output voltage value of the resonant circuit, the grid voltage value, and the grid current value.

[0040] Specifically, referring to Figure 3 and Figure 4 shown, a detection device can be set to sample the grid voltage value u a and the grid current value i a on the AC side of the on-vehicle charger, as well as sample the first output voltage value U bus on the bus capacitor, and sample the output current value I o of the DCDC module on the AC side of the on-vehicle charger and the second output voltage value U llc of the resonant circuit, and send the sampled data to the control module for controlling the on-vehicle charger.

[0041] Step S2, control the PFC module according to the output current value, grid current value, grid voltage value, and first output voltage value of the DCDC module, so that the output current value of the DCDC module is within the target current value range.

[0042] In the embodiment, the target current value range can be understood as the range of the output current value of the DCDC module when the instantaneous AC power on the AC side and the instantaneous DC power on the DC side in the on-vehicle charger are balanced. That is to say, when the output current value I of the DCDC module o is within this target current value range, it is determined that the instantaneous power difference between the AC side and the DC side in the on-vehicle charger reaches balance; conversely, when the output current value I of the DCDC module o is not within this target current value range, it is determined that the instantaneous power difference between the AC side and the DC side in the on-vehicle charger does not reach balance.

[0043] Specifically, in the embodiment of the present invention, by the output quantity on the DC side in the on-vehicle charger, that is, the output current value I of the DCDC module o and the first output voltage value U bus , and combined with the grid current value i on the AC side in the on-vehicle charger a and the grid voltage value u a to control the PFC module to adjust the AC side power, so that the output current value of the DCDC module is controlled within the target current value range. By this control method, the purpose of balancing the instantaneous power difference between the AC side and the DC side in the on-vehicle charger is achieved, and there is no need to configure a bus capacitor with a large capacitance value to solve the problem of instantaneous unequal power between the AC side and the DC side. Thus, the capacity requirement of the bus capacitor can be reduced, and then a capacitor with a smaller capacitance value can be selected as the bus capacitor when designing the on-vehicle charger, achieving the purpose of replacing the electrolytic capacitor with a smaller bus capacitor such as a film capacitor and reducing the cost.

[0044] Step S3, control the DCDC module according to the first output voltage value or the second output voltage value, so that the first output voltage value is within the target voltage value range.

[0045] In the embodiment, the target voltage value range can be understood as the working voltage range on the bus capacitor when each component in the on-vehicle charger operates normally. That is to say, when the first output voltage value U bus is within this target voltage value range, each component in the on-vehicle charger operates within the safe operating range; conversely, when the first output voltage value U bus is not within this target voltage value range, each component in the on-vehicle charger does not operate within the safe operating range, and there is a risk of device damage.

[0046] Specifically, by the first output voltage value U bus or the second output voltage value Ullc Control the DCDC module to adjust the energy stored in the bus capacitor and control the first output voltage value U bus within the target voltage value range, so that the DCDC module operates at a fixed gain, thereby ensuring the normal operation of the on-vehicle charger and avoiding the problem of device damage.

[0047] According to the method for controlling an on-vehicle charger in an embodiment of the present invention, the PFC module is controlled by the output current value, grid current value, grid voltage value, and first output voltage value of the DCDC module, that is, the active power on the AC side in the on-vehicle charger is adjusted by the output quantity on the DC side in the on-vehicle charger, so that the output current value of the DCDC module is within the target current value range, thereby playing a role in balancing the instantaneous power difference between the AC side and the DC side in the on-vehicle charger. In addition, the DCDC module is controlled by the first output voltage value or the second output voltage value to control the first output voltage value within the target voltage value range, so that the DCDC module can operate at a fixed gain, ensuring the normal operation of the on-vehicle charger and avoiding the problem of device damage. Thus, through the above control method, the effect of balancing the instantaneous power difference between the AC side and the DC side in the on-vehicle charger can be achieved while ensuring the normal function of the on-vehicle charger, thereby reducing the capacity requirement of the bus capacitor at the output end of the PFC module, reducing the capacitance value of the bus capacitor, and achieving the purpose of replacing the electrolytic capacitor with a smaller bus capacitor such as a thin-film capacitor.

[0048] In some embodiments, to ensure the normal operation of the on-vehicle charger, when the first output voltage value U bus is greater than the upper limit voltage value of the target voltage value range, it is necessary to transfer the energy stored in the bus capacitor to the output side of the on-vehicle charger, that is, reduce the switching frequency of the switching tube in the resonant circuit and increase the gain of the DCDC module to limit the further increase of the first output voltage value U bus on the bus capacitor; or, when the first output voltage value U bus is less than the lower limit voltage value of the target voltage value range, it is necessary to limit the transfer of the energy stored in the bus capacitor to the output side of the on-vehicle charger, that is, increase the switching frequency of the switching tube in the resonant circuit and reduce the gain of the DCDC module to limit the further decrease of the first output voltage value U bus on the bus capacitor. For example, as Figure 5 shown, the target voltage value U ref within the target voltage value range and the first output voltage value U busThe comparison is made by subtraction operation to obtain the working cycle signal of the switching tube in the resonant circuit, so as to adjust the switching frequency of the resonant circuit. Thus, in the above way, the first output voltage value can be effectively controlled within the target voltage value range, so that the DCDC module operates at a fixed gain, thereby avoiding the problem of device damage and ensuring the normal operation of the on-vehicle charger.

[0049] In some embodiments, to expand the output voltage range of the on-vehicle charger, the DCDC module of the embodiment of the present invention further includes a BUCK circuit. As Figure 4 or Figure 6 shown, the input end of the BUCK circuit is connected to the output end of the resonant circuit.

[0050] For Figure 4 or Figure 6 shown circuit topology diagram of the on-vehicle charger, when the second output voltage value U llc is greater than the upper limit value of the target voltage value range, it is necessary to transfer the energy stored in the bus capacitor to the output side of the on-vehicle charger, that is, to reduce the duty cycle of the control signal of the switching tube in the BUCK circuit and increase the gain of the DCDC module to limit the first output voltage value U bus on the bus capacitor from rising further; when the second output voltage value U llc is less than the lower limit value of the target voltage value range, it is necessary to limit the transfer of the energy stored in the bus capacitor to the output side of the on-vehicle charger, that is, to increase the duty cycle of the control signal of the switching tube in the BUCK circuit and reduce the gain of the DCDC module to limit the first output voltage value U bus from decreasing further. For example, as Figure 7 shown, the target voltage value U ref within the target voltage value range is compared with the second output voltage value U llc by subtraction operation to obtain the duty cycle of the control signal of the switching tube in the BUCK circuit, so as to adjust the PWM duty cycle of the BUCK circuit. Thus, in the above way, the first output voltage value can be effectively controlled within the target voltage value range, so that the DCDC module operates at a fixed gain, thereby avoiding the problem of device damage and ensuring the normal operation of the on-vehicle charger.

[0051] In some embodiments, to improve the efficiency of the on-vehicle charger, the method of the embodiment of the present invention further includes controlling the resonant circuit to operate in an open-loop mode to fix the output voltage of the resonant circuit, where the switching frequency of the resonant circuit in the open-loop mode is the resonant frequency.

[0052] Specifically, in the open-loop mode, the resonant circuit is determined only by its front-end input, and no longer readjusts its own state with reference to the actual situation of its rear-end BUCK circuit, that is, the actual situation of the BUCK circuit will not produce a counter-effect control process on the resonant circuit. Therefore, when the resonant circuit works in the open-loop mode, the first output voltage value U is adjusted by controlling the duty cycle of the control signal of the switch tube in the BUCK circuit. bus When the resonant circuit is not affected by the interference, the first output voltage value U bus The target voltage is controlled within the range so that the DCDC module works at a fixed gain, thereby avoiding damage to the device and ensuring the normal operation of the on-board charger. Optionally, when the resonant circuit is controlled to work in an open-loop mode, a square wave signal can be used to control the resonant circuit.

[0053] In some embodiments, the on-board charger uses Figure 3 When the circuit schematic diagram is shown, the output current of the resonant circuit is used as the output current of the DCDC module. When the output current value of the resonant circuit is I o The target current value I is lower than the target current value range o-ref When , it means that the active power on the AC side is lower than the active power on the DC side, then the given active power on the AC side needs to be increased, that is, the power on the AC side needs to be increased so that the output current value I of the resonant circuit o Adjust in the increasing direction; when the output current value of the resonant circuit I o Higher than the target current value I within the target current value range o-ref When , it means that the active power on the AC side is higher than the active power on the DC side, then the given active power on the AC side needs to be reduced, that is, the power on the AC side needs to be controlled to decrease, so that the output current value I of the resonant circuit o Adjust in the decreasing direction.

[0054] Alternatively, the on-board charger uses Figure 4 When the circuit schematic diagram is shown, the output current of the BUCK circuit is used as the output current of the DCDC module. When the output current value of the BUCK circuit is I o The target current value I is lower than the target current value range o-ref When , it means that the active power on the AC side is lower than the active power on the DC side, then the given active power on the AC side needs to be increased, that is, the power on the AC side needs to be increased so that the output current value I of the BUCK circuit o Adjust in the increasing direction; when the output current value of the BUCK circuit I o Higher than the target current value I within the target current value range o-refWhen it indicates that the active power on the AC side is higher than the active power on the DC side, it is necessary to reduce the given active power on the AC side, that is, control the reduction of the AC side power so that the output current value I of the BUCK circuit o is adjusted in the decreasing direction.

[0055] Specifically, when controlling the PFC module, the output current value I of the DCDC module o , the target current value I within the target current value range o-ref and the grid voltage value u a are used to obtain the AC current difference I a-ref . According to the AC current difference I a-ref and the grid current value i a , the first modulation value is obtained; according to the grid voltage value u a and the first output voltage value U bus , a division operation is performed to obtain the second modulation value; the PFC control signal is obtained according to the first modulation value and the second modulation value to control the PFC module.

[0056] In some embodiments, according to the output current value I of the DCDC module o and the target current value I o-ref , a subtraction operation is performed to obtain the DC current difference I a-ref ; the phase value cosωt of the grid voltage value u a is extracted; according to the DC current difference I a-ref and the phase value cosωt, a multiplication operation is performed to obtain the AC current difference I a-ref ; according to the AC current difference I a-ref and the grid current value i a , a subtraction operation is performed to obtain the first modulation value.

[0057] For example, as Figure 5 shown, the grid voltage value u a obtains the feedforward amount of the PFC module modulation wave, that is, the second modulation value, after passing through the feedforward gain, and calculates the difference between the output current value I o of the DCDC module and the target current value I o-ref to obtain the DC current difference I a-ref , that is, I a-ref =I o-ref —I o , and at the same time, the sampled grid voltage value u a is divided by its effective value to extract the phase value cosωt. The DC current difference I a-ref and the phase value cosωt are multiplied to obtain the AC current difference I a-ref . The AC current difference I a-ref and the grid current value i aThe difference is used to obtain the first modulation value of the feedback quantity of the PFC module modulation wave. Then, the feedforward quantity of the modulation wave and the feedback of the modulation wave are synthesized to obtain the difference between the feedforward quantity of the modulation wave and the feedback quantity of the modulation wave, that is, the modulation wave. And the modulation wave is controlled to pass through carrier modulation to obtain a PFC control signal, and the PFC control signal can be a pulse adjustment signal. Optionally, a triangular carrier wave can be used to perform carrier modulation on the modulation wave to obtain the control signal of the switching device in the PFC module.

[0058] An embodiment of the second aspect of the present invention provides an on-vehicle charger, as Figure 1 shown. The on-vehicle charger 10 includes a PFC module 1, a bus capacitor C0, a DCDC module 2, and a control module 3.

[0059] Among them, the PFC module 1 is used to perform power factor correction on the input AC signal; the bus capacitor C0 is connected to the PFC module 1; the DCDC module 2 includes a resonant circuit 21, and the input end of the resonant circuit 21 is connected to the bus capacitor C0. The DCDC module 2 is used to convert the AC signal into the electrical signal required by the battery; the control module 3 is connected to the PFC module 1 and the DCDC module 2, and is used to control the PFC module 1 and the DCDC module 2 according to the method for controlling the on-vehicle charger provided in the above embodiment.

[0060] In the embodiment, as Figure 3 shown, the PFC module 1 includes an inductor L1, a switching tube T1, a switching tube T2, a switching tube T3, and a switching tube T4; the resonant circuit 21 includes a switching tube T5, a switching tube T6, a switching tube T7, a switching tube T8, a resonant inductor L2, a resonant capacitor C2, a transformer M1, diodes D1, D2, D3, D4, and an output capacitor C3.

[0061] According to the on-vehicle charger 10 of the embodiment of the present invention, the control module 3 controls the PFC module 1 and the DCDC module 2 by using the method for controlling the on-vehicle charger provided in the above embodiment. Under the condition of ensuring the normal function of the on-vehicle charger, the capacitance value of the bus capacitor can be reduced, and the purpose of replacing the electrolytic capacitor with a smaller bus capacitor such as a thin film capacitor can be achieved.

[0062] In some embodiments, based on the control module 3 using the method for controlling the on-vehicle charger provided in the above embodiment to control the PFC module 1 and the DCDC module 2, the capacitance requirement of the bus capacitor C0 can be small. Therefore, the bus capacitor C0 can be selected as a thin film capacitor, which has good high-temperature resistance, small ESR, improves the overall efficiency of the machine, and has low cost. Optionally, the capacitance value range of the thin film capacitor is 4uf - 10uf.

[0063] In some embodiments, as Figure 6As shown, the DCDC module 2 further includes a BUCK circuit 22. The input end of the BUCK circuit 22 is connected to the output end of the resonant circuit 21 and is used to convert the electrical signal output by the resonant circuit 21 into the electrical signal required by the battery.

[0064] For example, as Figure 4 shown, the BUCK circuit 22 includes a switching transistor T9, a switching transistor T10, an inductor L3, and a capacitor C4.

[0065] An embodiment of the third aspect of the present invention provides a vehicle. As Figure 8 shown, the vehicle 20 includes a battery 4, the on-vehicle charger 10 provided in the above embodiment, and a detection device 5.

[0066] Among them, the on-vehicle charger 10 is connected to the battery 4; the detection device 5 is connected to the on-vehicle charger 10 and is used to detect the current signal, voltage signal, and grid electrical signal in the on-vehicle charger 10.

[0067] For the vehicle 20 according to the embodiment of the present invention, by adopting the on-vehicle charger 10 provided in the above embodiment, the capacitance value of the bus capacitor can be reduced while ensuring the normal function of the on-vehicle charger 10, and the purpose of replacing the electrolytic capacitor with a smaller bus capacitor, such as a film capacitor, can be achieved.

[0068] An embodiment of the fourth aspect of the present invention proposes a non-transitory computer storage medium, on which a computer program is stored. When the computer program is executed, the method for controlling the on-vehicle charger provided in the above embodiment is implemented.

[0069] In the description of this specification, any process or method description in the flowchart or described in other ways herein can be understood as representing a module, segment, or part of code including one or more executable instructions for implementing a customized logical function or process. The scope of the preferred embodiments of the present invention includes additional implementations, in which the functions can be executed in a substantially simultaneous manner or in a reverse order according to the involved functions, rather than in the order shown or discussed, and this should be understood by those skilled in the technical field to which the embodiments of the present invention belong.

[0070] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or in conjunction with these instruction execution systems, apparatuses, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection portion having one or more wirings (electronic device), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then storing it in a computer memory.

[0071] It should be understood that various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0072] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the method of the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0073] In addition, each functional unit in various embodiments of the present invention may be integrated into a processing module, or each unit may exist physically alone, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0074] The above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disc, etc. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0075] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0076] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for controlling an on-vehicle charger, characterized in that, the on-vehicle charger includes a PFC module, a bus capacitor and a DCDC module, the DCDC module includes a resonant circuit, an input end of the resonant circuit is connected to an output end of the bus capacitor, and the method includes: acquiring an output current value of the DCDC module, a first output voltage value on the bus capacitor, a second output voltage value of the resonant circuit, a grid voltage value and a grid current value; controlling the PFC module according to the output current value of the DCDC module, the grid current value, the grid voltage value and the first output voltage value, so that the output current value of the DCDC module is within a target current value range; controlling the DCDC module according to the first output voltage value or the second output voltage value, so that the first output voltage value is within a target voltage value range; wherein, controlling the PFC module according to the output current value of the DCDC module, the grid current value, the grid voltage value and the first output voltage value, so that the output current value of the DCDC module is within a target current value range, includes: obtaining an AC current difference according to the output current value of the DCDC module, a target current value within the target current value range and the grid voltage value, and obtaining a first modulation value according to the AC current difference and the grid current value; performing a division operation according to the grid voltage value and the first output voltage value to obtain a second modulation value; obtaining a PFC control signal according to the first modulation value and the second modulation value to control the PFC module; wherein, obtaining an AC current difference according to the output current value of the DCDC module, a target current value within the target current value range and the grid voltage value, and obtaining a first modulation value according to the AC current difference and the grid current value, includes: performing a subtraction operation on the output current value of the DCDC module and the target current value to obtain a DC current difference; extracting a phase value of the grid voltage value; performing a multiplication operation on the DC current difference and the phase value to obtain the AC current difference; performing a subtraction operation on the AC current difference and the grid current value to obtain the first modulation value; wherein, obtaining a difference between a feedforward amount of a modulation wave and a feedback amount of the modulation wave, that is, the modulation wave, and controlling the modulation wave to pass through carrier modulation to obtain a PFC control signal.

2. The method for controlling an on-vehicle charger according to claim 1, characterized in that, controlling the DCDC module according to the first output voltage value or the second output voltage value, so that the first output voltage value is within a target voltage value range, includes: when the first output voltage value is greater than an upper voltage limit value of the target voltage value range, reducing a switching frequency of a switching tube in the resonant circuit; when the first output voltage value is less than a lower voltage limit value of the target voltage value range, increasing a switching frequency of a switching tube in the resonant circuit.

3. The method for controlling an on-vehicle charger according to claim 1, characterized in that, The DCDC module further includes a BUCK circuit. The input end of the BUCK circuit is connected to the output end of the resonant circuit. Controlling the DCDC module according to the first output voltage value or the second output voltage value to make the first output voltage value within the target voltage value range includes: When the second output voltage value is greater than the upper voltage limit value of the target voltage value range, reducing the duty cycle of the control signal of the switching tube in the BUCK circuit; When the second output voltage value is less than the lower voltage limit value of the target voltage value range, increasing the duty cycle of the control signal of the switching tube in the BUCK circuit.

4. The method for controlling an on-vehicle charger according to claim 3, wherein, The method further includes: controlling the resonant circuit to operate in an open-loop mode, wherein the switching frequency of the resonant circuit in the open-loop mode is the resonant frequency.

5. The method for controlling an on-vehicle charger according to claim 2, wherein, The output current of the resonant circuit is the output current of the DCDC module.

6. The method for controlling an on-vehicle charger according to claim 3, wherein, The output current of the BUCK circuit is the output current of the DCDC module.

7. An on-vehicle charger, wherein, including: A PFC module for performing power factor correction on the input AC signal; A bus capacitor, the bus capacitor is connected to the PFC module; A DCDC module, the DCDC module includes a resonant circuit, the input end of the resonant circuit is connected to the bus capacitor, and the DCDC module is used to convert the AC signal into an electric signal required by the battery; A control module, the control module is connected to the PFC module and the DCDC module, and is used to control the PFC module and the DCDC module according to the method for controlling an on-vehicle charger according to any one of claims 1-6.

8. The on-vehicle charger according to claim 7, wherein, The bus capacitor is a thin film capacitor.

9. The on-vehicle charger according to claim 7, wherein, The DCDC module further includes a BUCK circuit, the input end of the BUCK circuit is connected to the output end of the resonant circuit, and is used to convert the electric signal output by the resonant circuit into an electric signal required by the battery.

10. A vehicle, wherein, including: A battery; The on-vehicle charger according to any one of claims 7-9, the on-vehicle charger is connected to the battery; A detection device, the detection device is connected to the on-vehicle charger, and is used to detect the current signal, voltage signal and grid electric signal in the on-vehicle charger.

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