Charger control method, charger control device, charger, and vehicle

Abstract

A charger control method, a charger control device, a charger, and a vehicle. This method is applicable to a charger, where the charger is an on-board charger or a charging station charger, and the method includes determining a target operating mode of an LLC circuit according to a first voltage of a battery, where the target operating mode is a full-bridge mode or a half-bridge mode, and controlling the LLC circuit to operate according to the target operating mode. According to this method, the operating mode of the LLC circuit can be dynamically switched according to the battery voltage without generating uncontrollable rectification current. As a result, the charger operates safely, stably, and reliably under various operating conditions, and the control mode is simple and efficient.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to and the benefit of Chinese Patent Application No. 202211059072.4, entitled "Charger Control Method and Charger Control Device, Charger, and Vehicle," filed on August 30, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the field of vehicle technology, and in particular to a charger control method and charger control device, a charger, and a vehicle. [Background technology]

[0003] A charger is an electrical device that converts AC current to DC current and is used as a charging device for electric vehicles to supply power to batteries. A two-stage topology is typically used in existing chargers, with the front-stage circuit being a power factor correction circuit and the back-stage circuit being an isolated DC / DC circuit (i.e., an LCC circuit (resonant circuit)), and the instantaneous power difference between the AC and DC sides is balanced by a bus capacitor between the two stages.

[0004] Currently, in the charger manufacturing process, the upper and lower bridge arms of the isolated DC-DC circuit are turned on in a complementary manner to supply power to the vehicle battery. However, if the AC voltage of the charger is high but the battery voltage is low, an uncontrollable rectification current will occur, resulting in a risk to the charger. Summary of the Invention [Problem to be solved by the invention]

[0005] To overcome the problems existing in the related art, the present disclosure provides a charger control method and a charger control device, a charger, and a vehicle. [Means for solving the problem]

[0006] To achieve the above object, according to a first aspect, the present disclosure provides a charger control method, which is applied to a charger, the charger being an on-board charger or a charger at a charging station, the charger including an LLC circuit, and the LLC circuit being connected to a battery. The method includes: determining a target operating mode of the LLC circuit according to a first voltage of the battery, the target operating mode being a full-bridge mode or a half-bridge mode; Controlling the LLC circuit to operate in accordance with a target operating mode; Includes.

[0007] Optionally, determining a target operation mode of the LLC circuit according to the first voltage comprises: determining a target operating mode to be a half-bridge mode when the first voltage is less than a first preset voltage; determining a target operation mode to be a full-bridge mode when the first voltage is equal to or greater than a first preset voltage; Includes.

[0008] Optionally, the LLC circuit includes an inverter circuit, a resonant circuit, and a rectifier circuit connected in series, the inverter circuit including a first phase bridge arm and a second phase bridge arm; Controlling the LLC circuit to operate in accordance with the target operating mode includes: When the target operation mode is a half-bridge mode, the control circuit includes controlling an upper bridge arm and a lower bridge arm of a first-phase bridge arm to be complementarily turned on at a first duty ratio, controlling an upper bridge arm of a second-phase bridge arm to be turned off, and controlling a lower bridge arm of the second-phase bridge arm to be turned on; When the target operating mode is the full-bridge mode, the control includes controlling the upper bridge arm and the lower bridge arm of the first-phase bridge arm to be turned on complementarily at a first duty ratio, and controlling the upper bridge arm and the lower bridge arm of the second-phase bridge arm to be turned on complementarily at a first duty ratio, wherein the upper bridge arm of the first-phase bridge arm and the lower bridge arm of the second-phase bridge arm are turned on simultaneously, and the lower bridge arm of the first-phase bridge arm and the upper bridge arm of the second-phase bridge arm are turned on simultaneously.

[0009] Optionally, the charger further includes a bus capacitor, wherein first bus ends of the first phase bridge arm and the second phase bridge arm are connected to an end of the bus capacitor, and second bus ends of the first phase bridge arm and the second phase bridge arm are connected to another end of the bus capacitor; When the target operation mode is a full-bridge mode, before the step of controlling the upper bridge arm and the lower bridge arm of the first phase bridge arm to be complementarily turned on at a first duty ratio, controlling the LLC circuit to operate in accordance with the target operation mode obtaining a second voltage on the bus capacitor; performing a step of controlling an upper bridge arm and a lower bridge arm of the first phase bridge arm to be complementarily turned on with a first duty ratio when the second voltage is less than a second preset voltage, wherein a ratio of the second preset voltage to the first preset voltage is equal to a turns ratio of a transformer in the resonant circuit; Further includes:

[0010] Optionally, controlling the LLC circuit to operate in accordance with the target operating mode comprises: When the second voltage is equal to or greater than a second preset voltage, the control circuit further includes controlling the upper bridge arm and the lower bridge arm of the first-phase bridge arm to be turned on complementarily with a second duty ratio, and controlling the upper bridge arm and the lower bridge arm of the second-phase bridge arm to be turned on complementarily with a second duty ratio, wherein the upper bridge arm of the first-phase bridge arm and the lower bridge arm of the second-phase bridge arm are turned on simultaneously, and the lower bridge arm of the first-phase bridge arm and the upper bridge arm of the second-phase bridge arm are turned on simultaneously, and the second duty ratio is less than the first duty ratio.

[0011] Optionally, the charger further includes a power factor correction circuit and a bus capacitor, the power factor correction circuit being connected to the LLC circuit via the bus capacitor; This method is acquiring current electrical information of the AC side of the charger and a second voltage of the bus capacitor, the electrical information including a current and a current voltage of the AC side; determining a steady-state target current on the AC side; Determining a target current value on the AC side according to the current voltage and the steady-state target current; controlling the power factor correction circuit to perform power factor correction according to the target current value, the present current, the present voltage, and the second voltage; Further includes:

[0012] Optionally, determining a steady state target current on the AC side comprises: determining a target charging power on the AC side; determining a target current for a steady state on the AC side according to the target charging power; Includes.

[0013] According to a second aspect, the present disclosure provides a charger control device, the charger control device comprising: a memory containing a computer program; a controller that, when executing a computer program, performs steps of a charger control method according to the first aspect of the present disclosure; Includes.

[0014] According to a third aspect, the present disclosure provides a charger including a power factor correction circuit, a bus capacitor, and an LLC circuit, which are connected in series. A charger control device according to a second aspect of the present disclosure, wherein the charger control device is connected to both a power factor correction circuit and an LLC circuit. Further includes:

[0015] According to a fourth aspect, the present disclosure provides a vehicle including a battery and a charger according to the third aspect of the present disclosure.

[0016] In the above technical solution, the target operating mode of the LLC circuit can be determined according to the battery voltage, and the LLC circuit is controlled to operate according to the target operating mode. The target operating mode is full-bridge mode or half-bridge mode. Therefore, the operating mode of the LLC circuit can be dynamically switched according to the battery voltage without generating uncontrollable rectification current. As a result, the charger operates safely, stably, and reliably under various operating conditions, and the control mode is simple and efficient.

[0017] Other features and advantages of the present disclosure are described in detail in the following specific implementations.

[0018] The accompanying drawings are provided to provide a further understanding of the present disclosure and constitute a part of this specification. The accompanying drawings, together with specific implementations, are used to explain the present disclosure and are not to be construed as limiting the present disclosure in any way. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 2 is a block diagram of the architecture of a charger according to an exemplary embodiment. [Figure 2]FIG. 2 is a diagram of a circuit topology structure of a charger according to an exemplary embodiment. [Figure 3] 4 is a flow diagram of a charger control method according to an exemplary embodiment. [Figure 4] FIG. 1 is a schematic diagram of a method for controlling a power factor correction circuit in a charger according to an exemplary embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] Specific implementations of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific implementations described herein are merely used to describe and explain the present disclosure, and are not intended to limit the present disclosure.

[0021] The present disclosure provides a charger. The charger may be an on-board charger or a charging station charger, and the charging station charger and the on-board charger may adopt the same topology structure (as shown in FIG. 2). As shown in FIG. 1, the charger 100 includes a charger control device 5, and a power factor correction circuit 2, a bus capacitor C1, and an LLC circuit 3, which are connected in series. The power factor correction circuit 2 is connected to a power grid 1, the LLC circuit 3 is configured to be connected to a battery 4, and the bus capacitor C1, which may be an electrolytic capacitor, a thin-film capacitor, a ceramic capacitor, or the like, is configured to filter a DC voltage.

[0022] The charger control device 5 is connected to both the power factor correction circuit 2 and the LLC circuit 3, and is configured to perform a charger control method applied to a charger in order to control the power factor correction circuit 2 and the LLC circuit 3 to operate in a manner that charges the battery. The power factor correction circuit 2 is configured to perform power factor correction on an input signal from the power system and output a current signal obtained by the power factor correction, and the LLC circuit 3 is configured to perform DC current conversion on the current signal obtained by the power factor correction to obtain a DC current for charging the vehicle battery.

[0023] As shown in FIG. 2, the power factor correction circuit 2 may include a third-phase bridge arm formed by a first switch tube T1 and a second switch tube T2, and a fourth-phase bridge arm formed by a third switch tube T3 and a fourth switch tube T4, where the midpoint of the third-phase bridge arm is connected to the anode of the power grid 1 via an inductor L1, the midpoint of the fourth-phase bridge arm is connected to the cathode of the power grid 1, the third bus ends of the third-phase bridge arm and the fourth-phase bridge arm are connected to one end of a bus capacitor C1, and the fourth bus ends of the third-phase bridge arm and the fourth-phase bridge arm are connected to another end of the bus capacitor C1.

[0024] The current voltage on the AC side of the charger is u a and the current on the AC side of the charger is i a and the voltage across the two ends of the bus capacitor C1 is Ubus (i.e., the second voltage).

[0025] As shown in FIG. 2, the LLC circuit includes an inverter circuit 31, a resonant circuit 32, and a rectifier circuit 33, which are connected in series.

[0026] The inverter circuit 31 includes a first phase bridge arm formed by the fifth switch tube T5 and the sixth switch tube T6, and a second phase bridge arm formed by the seventh switch tube T7 and the eighth switch tube T8, and first bus ends of the first phase bridge arm and the second phase bridge arm are connected to an end of the bus capacitor C1 and a third bus end, and second bus ends of the first phase bridge arm and the second phase bridge arm are connected to another end of the bus capacitor C1 and a fourth bus end.

[0027] The resonant circuit 32 employs an LLC resonant cavity and includes a resonant inductor L2, a resonant capacitor C2, and a transformer M1. One end of the resonant inductor L2 is connected to the midpoint of the first phase bridge arm, and the other end is connected to a first input end of the primary side of the transformer M1. The resonant inductor L2 may be magnetically integrated with the transformer M1 and participate in resonance in the resonant circuit. The resonant capacitor C2 is connected to the midpoint of the second phase bridge arm, and the other end is connected to a second input end of the primary side of the transformer M1. The resonant capacitor C2 may be a thin-film capacitor or a ceramic capacitor, which prevents DC offset in the transformer M1 and participates in resonance in the resonant circuit. The transformer M1 may be a tapped transformer and configured to provide isolated transmission of electrical energy.

[0028] The rectifier circuit 33 includes a fifth-phase bridge arm formed by a first diode D1 and a second diode D2, a sixth-phase bridge arm formed by a third diode D3 and a fourth diode D4, and a thin-film capacitor C3. The midpoint of the fifth-phase bridge arm is connected to a first input end of the secondary side of a transformer M1, and the midpoint of the sixth-phase bridge arm is connected to a second input end of the secondary side of the transformer M1. Fifth bus ends of the fifth-phase bridge arm and the sixth-phase bridge arm are connected to an end of the thin-film capacitor C3 and the positive terminal of a battery 4, and sixth bus ends of the fifth-phase bridge arm and the sixth-phase bridge arm are connected to another end of the thin-film capacitor C3 and the negative terminal of a battery 4. The thin-film capacitor C3 is a battery-side capacitor configured to filter the DC voltage on the battery side.

[0029] In addition, it should be noted that the rectifier circuit 33 may use a switch tube device or a rectifier diode (as shown in FIG. 2) to implement the transmission of electrical energy.

[0030] The charger control method is described in detail below. As shown in Figure 3, the method may include S301 and S302.

[0031] S301. A target operating mode of an LLC circuit is determined according to a first voltage of a battery.

[0032] In the present disclosure, the first voltage of the battery is the voltage between two ends of the battery, that is, the DC voltage, and may be obtained by sampling using a voltage sensor or in the form of packet communication from the vehicle.

[0033] The target operating mode is full-bridge mode or half-bridge mode.

[0034] S302. The LLC circuit is controlled to operate according to a target operating mode.

[0035] In the above technical solution, the target operating mode of the LLC circuit can be determined according to the battery voltage, and the LLC circuit is controlled to operate according to the target operating mode. The target operating mode is full-bridge mode or half-bridge mode. Therefore, the operating mode of the LLC circuit can be dynamically switched according to the battery voltage without generating uncontrollable rectification current. As a result, the charger operates safely, stably, and reliably under various operating conditions, and the control mode is simple and efficient.

[0036] The following describes in detail the specific implementation of determining the target operation mode of the LLC circuit according to the first voltage of the battery in S301.

[0037] Specifically, if the first voltage is less than the first preset voltage, the target operating mode is determined to be the half-bridge mode, and if the first voltage is equal to or greater than the first preset voltage, the target operating mode is determined to be the full-bridge mode.

[0038] As can be known based on the circuit principle of the circuit topology shown in Figure 2, to ensure that the charger operates within a safe range, the voltage between the two ends of the bus capacitor C1 (i.e., the second voltage) should be

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number

[0039] Therefore, the first preset voltage is:

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number

[0040] The first voltage of the battery

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[0041] The specific implementation of controlling the LLC circuit to operate in accordance with the target operating mode in S302 will be described in detail below.

[0042] Specifically, when the target operating mode is the half-bridge mode, the upper bridge arm and the lower bridge arm of the first-phase bridge arm are controlled to be turned on in a complementary manner at a first duty ratio, the upper bridge arm of the second-phase bridge arm is controlled to be turned off, and the lower bridge arm of the second-phase bridge arm is controlled to be turned on; when the target operating mode is the full-bridge mode, the upper bridge arm and the lower bridge arm of the first-phase bridge arm are controlled to be turned on in a complementary manner at a first duty ratio, the upper bridge arm and the lower bridge arm of the second-phase bridge arm are controlled to be turned on in a complementary manner at a first duty ratio, the upper bridge arm of the first-phase bridge arm and the lower bridge arm of the second-phase bridge arm are turned on simultaneously, and the lower bridge arm of the first-phase bridge arm and the upper bridge arm of the second-phase bridge arm are turned on simultaneously.

[0043] For example, the LLC circuit is shown in Figure 2. In this case, when the target operating mode is a half-bridge mode, the fifth switch tube T5 and the sixth switch tube T6 are controlled to be turned on complementarily with a first duty ratio, the seventh switch tube T7 is controlled to be continuously turned off, and the eighth switch tube T8 is controlled to be continuously turned on; when the target operating mode is a full-bridge mode, the fifth switch tube T5 and the sixth switch tube T6 are controlled to be turned on complementarily with a first duty ratio, the seventh switch tube T7 and the eighth switch tube T8 are controlled to be turned on complementarily with a first duty ratio, the fifth switch tube T5 and the eighth switch tube are turned on simultaneously, and the sixth switch tube T6 and the seventh switch tube T7 are turned on simultaneously.

[0044] In addition, according to the abnormality analysis, the operating modes of the LLC circuit are distinguished by using the first preset voltage as a critical point. Therefore, the voltage Ubus between the two ends of the bus capacitor C1 in the two operating modes (i.e., full-bridge mode and half-bridge mode) is significantly different. It can be estimated that Ubus = 2*K*Udc in half-bridge mode and Ubus = K*Udc in full-bridge mode. Thus, when the LLC circuit switches from half-bridge mode to full-bridge mode, the input voltage (i.e., Ubus) of the LLC circuit becomes excessively high, resulting in an excessively large current in the resonant cavity, which may damage the charger. For the same on-time, a higher input voltage of the LLC circuit indicates a larger current flowing through the resonant circuit.

[0045] To avoid the generation of large currents in the resonant cavity when the LLC circuit is switched from half-bridge mode to full-bridge mode, the following method is proposed.

[0046] To ensure that the charger operates within a safe range, the voltage across the two ends of the bus capacitor C1 should be

number

number

[0047] Specifically, when the target operation mode is the full-bridge mode, the LLC circuit operates in accordance with the target operation mode (S302) before the step of controlling the upper bridge arm and the lower bridge arm of the first phase bridge arm to be turned on complementarily at a first duty ratio. a second voltage of the bus capacitor is obtained; When the second voltage is less than a second preset voltage, controlling the upper bridge arm and the lower bridge arm of the first phase bridge arm to be turned on complementarily with a first duty ratio, and controlling the upper bridge arm and the lower bridge arm of the second phase bridge arm to be turned on complementarily with the first duty ratio, wherein the ratio of the second preset voltage to the first preset voltage is equal to the turns ratio of a transformer in the resonant circuit; a step of controlling the upper bridge arm and the lower bridge arm of the first-phase bridge arm to be turned on complementarily with a second duty ratio when the second voltage is equal to or greater than a second preset voltage, and controlling the upper bridge arm and the lower bridge arm of the second-phase bridge arm to be turned on complementarily with a second duty ratio, wherein the upper bridge arm of the first-phase bridge arm and the lower bridge arm of the second-phase bridge arm are turned on simultaneously, the lower bridge arm of the first-phase bridge arm and the upper bridge arm of the second-phase bridge arm are turned on simultaneously, and the second duty ratio is smaller than the first duty ratio; For example, the first duty ratio is 50% and the second duty ratio is 10%.

[0048] In the above implementation, when the Ubus is equal to or greater than the second preset voltage, the LLC circuit does not directly switch from half-bridge mode to full-bridge mode. Instead, the upper and lower bridge arms of each phase bridge arm in the inverter circuit are controlled to be complementarily turned on at a duty ratio smaller than the first duty ratio. This limits the duty ratio of the upper and lower bridge arms of each phase bridge arm in the inverter circuit, i.e., reduces the on-time of the upper and lower bridge arms of each phase bridge arm in the inverter circuit. This effectively suppresses the current in the resonant cavity and prevents a large current from being generated in the resonant cavity when the LLC circuit switches from half-bridge mode to full-bridge mode, thereby improving the safety and stability of the charger.

[0049] In addition, the above-mentioned method may further include the following steps (1) to (4).

[0050] (1) The current electrical information of the AC side of the charger and the second voltage of the bus capacitor are acquired.

[0051] In this disclosure, electrical information includes the current and voltage present on the AC side.

[0052] For example, the current of the AC side of the charger may be acquired by a current sensor, and the current voltage of the AC side of the charger and the second voltage of the bus capacitor may be acquired by a current sensor. In this way, the current electrical information of the AC side of the charger and the second voltage of the bus capacitor are clear and can provide data support for adjusting the current on the AC side.

[0053] (2) The steady-state target current on the AC side is determined.

[0054] For purposes of this disclosure, the steady state target current is the current value that corresponds to the AC side of the charger when the charger is in its best stable and efficient operating condition.

[0055] (3) The target current on the AC side is determined according to the current voltage and the steady-state target current.

[0056] For example, the phase of the AC output by the power grid is the current voltage u a (i.e., the voltage of the current output by the power grid). For example, the product of the steady-state target current and the phase of the AC current output by the power grid can be determined as the target current value. As shown in FIG. 4, when the steady-state target current is I a_ref and the phase of the AC output by the power system and determined by the phase-locked loop is cos wt, then I a_ref *cos wt is the target current value I a_ref1 can be determined as:

[0057] (4) The power factor correction circuit is controlled to perform power factor correction according to the target current value, the current current, the current voltage, and the second voltage.

[0058] Specifically, as shown in FIG. 4, the feedforward amount u a To obtain / Ubus, the second voltage Ubus and the current voltage u a can be input to the divider. The target current value I a_ref1 and the current i a is input to the controller to obtain the feedback amount of the closed-loop control result. Then, the difference between the feedforward amount and the feedback amount is used as a modulating wave and transmitted to the PWM generator to obtain the duty ratio of the power factor correction (PFC) circuit, and the current on the AC side changes with the target current value by adjusting the duty ratio of the power factor correction circuit, so that the power factor correction can be performed.

[0059] The following describes a specific implementation of determining the steady-state target current of the AC side in the above step (2). Specifically, this step can be implemented by the following steps (21) and (22).

[0060] (21) The target charging power on the AC side is determined.

[0061] In the present disclosure, the target charging power on the AC side is the AC power of the charger when the charger is in the best stable and efficient operating state. Specifically, the target charging power is determined as the minimum value among the maximum output power of the power grid, the current output power of the power grid, the maximum charging power of the battery allowed by the battery management system, the maximum power allowed by the power line, and the maximum charging power of the charger.

[0062] For example, the maximum output power of the power grid and the maximum power allowed by the power lines can be determined in accordance with the contents of the national standard GBT 18487.1-2015. The current output power of the power grid can be determined by a power sensor pre-installed in the power grid. The maximum charging power of the battery allowed by the battery management system can be determined according to relevant parameter information of the battery. The maximum charging power of the charger can be determined according to the selection of the charger's hardware devices, i.e., it can belong to the parameters of the charger's unique attributes. The powers to be selected are the maximum powers corresponding to the power of the power grid, battery, power lines, and charger, respectively, and the current output power of the power grid. Therefore, by selecting a minimum value as the target charging power, it can be ensured that the power grid, battery, and power lines connected to the various parts of the charger are all in a safe operating state during charger operation, thereby reducing the possibility of damage to electronic components in the associated circuits. In addition, it can be ensured that the power on the AC side of the charger reaches its maximum value while ensuring operational safety. Therefore, when the power on the AC side of the charger is at the target charging power, the charger can be in the best stable and efficient operating state.

[0063] (22) The steady-state target current on the AC side is determined according to the target charging power.

[0064] In the present disclosure, the steady-state target current on the AC side is a current value determined according to the target charging power, and may be determined according to the quotient of the target charging power and the effective value of the AC voltage output by the power grid.

[0065] In addition, the charger control device 5 a memory containing a computer program; a controller that, when executing a computer program, performs steps of a charger control method according to the present disclosure; may include:

[0066] The present disclosure further provides a vehicle including a battery and a charger according to the present disclosure.

[0067] Although the exemplary implementations of the present disclosure have been described in detail above with reference to the accompanying drawings, the present disclosure is not limited to the specific details of the above implementations.Various simple modifications can be made to the technical solutions of the present disclosure within the technical idea of ​​the present disclosure, and all such simple modifications shall fall within the protection scope of the present disclosure.

[0068] In addition, it should be noted that the specific technical features described in the above specific implementations may be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the various possible combinations will not be further described in this disclosure.

[0069] In addition, various implementations of the present disclosure may be combined in any manner without departing from the spirit of the present disclosure, and such combinations shall also be considered to be disclosed in the present disclosure.

Claims

1. A charger control method applied to a charger, the charger being an on-board charger or a charger at a charging station, the charger including an LLC circuit battery, the LLC circuit being connected to the charger, the method comprising: determining a target operating mode of the LLC circuit according to a first voltage of the battery, wherein the target operating mode is a full-bridge mode or a half-bridge mode; controlling the LLC circuit to operate in accordance with the target operating mode; A charger control method comprising:

2. determining a target operating mode of the LLC circuit according to a first voltage; determining the target operating mode to be the half-bridge mode if the first voltage is less than a first preset voltage; determining the target operating mode to be the full-bridge mode when the first voltage is equal to or greater than the first preset voltage; The method of claim 1 , comprising:

3. the LLC circuit comprises an inverter circuit, a resonant circuit, and a rectifier circuit, which are connected in series, the inverter circuit comprising a first phase bridge arm and a second phase bridge arm; The controlling of the LLC circuit to operate in accordance with the target operating mode includes: When the target operation mode is the half-bridge mode, controlling an upper bridge arm and a lower bridge arm of the first phase bridge arm to be complementarily turned on at a first duty ratio, controlling an upper bridge arm of the second phase bridge arm to be turned off, and controlling a lower bridge arm of the second phase bridge arm to be turned on, when the target operation mode is the full-bridge mode, controlling the upper bridge arm and the lower bridge arm of the first phase bridge arm to be turned on complementarily at the first duty ratio, and controlling the upper bridge arm and the lower bridge arm of the second phase bridge arm to be turned on complementarily at the first duty ratio, wherein the upper bridge arm of the first phase bridge arm and the lower bridge arm of the second phase bridge arm are turned on simultaneously, and the lower bridge arm of the first phase bridge arm and the upper bridge arm of the second phase bridge arm are turned on simultaneously.

3. The method according to claim 1 or 2.

4. the charger further includes a bus capacitor, wherein first bus ends of the first phase bridge arm and the second phase bridge arm are connected to one end of the bus capacitor, and second bus ends of the first phase bridge arm and the second phase bridge arm are connected to another end of the bus capacitor; When the target operation mode is the full-bridge mode, before the step of controlling the upper bridge arm and the lower bridge arm of the first phase bridge arm to be complementarily turned on at the first duty ratio, controlling the LLC circuit to operate in accordance with the target operation mode includes: obtaining a second voltage of the bus capacitor; performing the step of controlling the upper bridge arm and the lower bridge arm of the first phase bridge arm to be complementarily turned on at the first duty ratio when the second voltage is less than a second preset voltage, wherein a ratio of the second preset voltage to the first preset voltage is equal to a turns ratio of a transformer in the resonant circuit; The method of claim 3 further comprising:

5. The controlling of the LLC circuit to operate in the target operating mode includes:

5. The method of claim 4, further comprising: controlling the upper bridge arm and the lower bridge arm of the first phase bridge arm to be turned on in a complementary manner with a second duty ratio when the second voltage is equal to or greater than the second preset voltage; and controlling the upper bridge arm and the lower bridge arm of the second phase bridge arm to be turned on in a complementary manner with the second duty ratio, wherein the upper bridge arm of the first phase bridge arm and the lower bridge arm of the second phase bridge arm are turned on simultaneously, the lower bridge arm of the first phase bridge arm and the upper bridge arm of the second phase bridge arm are turned on simultaneously, and the second duty ratio is less than the first duty ratio.

6. the charger further comprises a power factor correction circuit and the bus capacitor, the power factor correction circuit being connected to the LLC circuit via the bus capacitor; The method comprises: obtaining current electrical information of the AC side of the charger and the second voltage of the bus capacitor, the electrical information comprising a current and a current voltage of the AC side; determining a steady-state target current on the AC side; determining a target current value on the AC side according to the current voltage and the steady-state target current; controlling the power factor correction circuit to perform power factor correction according to the target current value, the present current, the present voltage, and the second voltage; The method of claim 1 , further comprising:

7. Determining the steady-state target current of the AC side includes: determining a target charging power on the AC side; determining the steady-state target current of the AC side according to the target charging power; The method of claim 6 , comprising:

8. a memory having a computer program stored therein; a controller which, when executing said computer program, carries out the steps of the method according to any one of claims 1 to 7; A charger control device (5) comprising:

9. A charger (100) comprising a power factor correction circuit (2), a bus capacitor (C1), and an LLC circuit (3) connected in series, 9. The charger control device (5) according to claim 8, wherein the charger control device (5) is connected to both the power factor correction circuit (2) and the LLC circuit (3). The charger (100) further comprises:

10. A vehicle comprising a battery (4) and a charger (100) according to claim 9.

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