Charger control method, device, charger and vehicle

Abstract

The present disclosure relates to a charger control method, device, charger and vehicle. The method is applied to a charger, which is an on-board charger or a charging pile charger, and includes: obtaining the current voltage, current current and bus capacitor voltage on the AC side of the charger; determining the steady-state target current and current correction amount on the AC side; determining the target current value on the AC side according to the current voltage and steady-state target current; correcting the target current value using the current correction amount; controlling the current on the AC side according to the corrected target current value, current voltage, current current and bus capacitor voltage, so that the current on the AC side follows the corrected target current value. Correcting the target current value using the current correction amount can ensure the accuracy of the corrected target current value, so that the current on the AC side closely follows the corrected target current value, and avoids deviations in the positive and negative half-cycle currents on the AC side, so as to adjust the actual current balance on the AC side.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular, to a charger control method, a charger, and a vehicle. Background Art

[0002] An on-board charger is an electronic device that converts AC power into DC power. It is used as an on-board charger for electric vehicles to charge batteries. Existing on-board chargers mostly use a two-stage topology, with a power factor correction circuit in the front stage and an isolated DCDC circuit (LLC, short for resonant circuit) in the back stage. The bus capacitor is used to balance the instantaneous power difference between the AC side and the DC side between the two stages.

[0003] Among them, the on-board charger controls charging according to the sampled voltage and sampled current on the AC side collected by the AC side sampling circuit. Due to the hardware sampling error of the sampling circuit, deviations may occur in the positive and negative half-cycle currents on the AC side, which may cause AC current imbalance. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present disclosure provides a charger control method, a charger device, a charger and a vehicle.

[0005] In order to achieve the above-mentioned object, in a first aspect, the present disclosure provides a charger control method, which is applied to a charger, wherein the charger is a vehicle-mounted charger or a charging pile charger, and the method comprises:

[0006] Obtain the current voltage, current and bus capacitor voltage on the AC side of the charger;

[0007] Determining a steady-state target current and a current correction amount on the AC side;

[0008] Determining a target current value of the AC side according to the current voltage and the steady-state target current;

[0009] Correcting the target current value using the current correction amount;

[0010] According to the target current value obtained after correction, the current voltage, the current and the bus capacitor voltage, the current on the AC side is controlled so that the current on the AC side follows the target current value obtained after correction.

[0011] Optionally, determining the current correction amount on the AC side includes:

[0012] Continuously collecting the current on the AC side a first preset number of times according to a first sampling period;

[0013] The current correction amount of the AC side is determined according to the current of the AC side for the first preset number of times.

[0014] Optionally, determining the current correction amount on the AC side according to the current on the AC side for the first preset number of times includes:

[0015] An average value of the current on the AC side for the first preset number of times is determined as the current correction amount on the AC side.

[0016] Optionally, the first preset number is an integer multiple of a quotient of the AC side current cycle and the first sampling cycle, wherein the first sampling cycle is much smaller than the AC side current cycle.

[0017] Optionally, obtaining the current voltage and current of the AC side of the charger includes:

[0018] The current voltage on the AC side is determined by the current voltage AD value on the AC side of the charger collected by the AC side sampling circuit, and the current current on the AC side is determined by the current current AD value on the AC side collected by the AC side sampling circuit;

[0019] The method further comprises:

[0020] When the charger is powered on, a zero point calibration is performed on the AC side sampling circuit.

[0021] Optionally, the performing zero point correction on the AC side sampling circuit includes:

[0022] The sampled voltage AD value and / or the sampled current AD value of the AC side sampling circuit are corrected to achieve zero point correction of the AC side sampling circuit.

[0023] Optionally, the correcting the sampled voltage AD value and / or the sampled current AD value of the AC side sampling circuit includes:

[0024] Continuously collecting the voltage AD value and / or current AD value of the AC side a second preset number of times according to a second sampling period;

[0025] Determine the correction amount of the sampled voltage AD value of the AC side sampling circuit according to the voltage AD value of the AC side for the second preset number of times, and / or determine the correction amount of the sampled current AD value of the AC side sampling circuit according to the current AD value of the AC side for the second preset number of times;

[0026] The sampled voltage AD value is corrected according to the correction amount of the sampled voltage AD value, and / or the sampled current AD value is corrected according to the correction amount of the sampled current AD value.

[0027] In a second aspect, the present disclosure provides a charger control device, comprising:

[0028] a memory having a computer program stored thereon;

[0029] A controller, wherein when the computer program is executed by the controller, the steps of the charger control method provided in the first aspect of the present disclosure are implemented.

[0030] In a third aspect, the present disclosure provides a charger, including a power factor correction circuit, a bus capacitor, and an LLC circuit connected in sequence, and the charger further includes:

[0031] The charger control device provided in the second aspect of the present disclosure is connected to the power factor correction circuit and the LLC circuit respectively.

[0032] In a fourth aspect, the present disclosure provides a vehicle, comprising a battery and the charger provided in the third aspect of the present disclosure.

[0033] In the above technical solution, first, the target current value of the AC side is determined according to the current voltage and steady-state target current of the AC side of the charger; then, the target current value is corrected using the current correction amount; finally, the current on the AC side is controlled according to the target current value obtained after correction, the current voltage on the AC side, the current current on the AC side, and the bus capacitor voltage, so that the current on the AC side follows the target current value obtained after correction, thereby achieving power factor correction. Among them, correcting the target current value using the current correction amount can ensure the accuracy of the target current value obtained after correction, so that the current on the AC side closely follows the target current value obtained after correction, avoiding deviations in the positive and negative half-cycle currents on the AC side, and achieving the ultimate purpose of adjusting the actual current balance of the AC side, that is, achieving dynamic balance of the AC current.

[0034] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0036] Figure 1 The figure is a structural block diagram of a charger according to an exemplary embodiment.

[0037] Figure 2 The figure is a circuit topology diagram of a charger according to an exemplary embodiment.

[0038] Figure 3 The figure is a flow chart of a charger control method according to an exemplary embodiment.

[0039] Figure 4 is a schematic diagram of a charger control method according to an exemplary embodiment. DETAILED DESCRIPTION

[0040] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0041] The present disclosure provides a charger, wherein the charger can be a vehicle-mounted charger or a charging pile charger, and the charging pile charger can adopt the same circuit topology as the vehicle-mounted charger (such as Figure 2 As shown in Figure 1 As shown, 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 connected in sequence, wherein the power factor correction circuit 2 is connected to the power grid 1, the LLC circuit 3 is used to connect to the battery 4, and the bus capacitor C1 can be an electrolytic capacitor, a film capacitor, a ceramic capacitor, etc., for DC voltage filtering.

[0042] The charger control device 5 is connected to the power factor correction circuit 2 and the LLC circuit 3 respectively, and is used to execute the charger control method applied to the above charger to control the power factor correction circuit 2 and the LLC circuit 3 to work, thereby realizing battery charging. Among them, the power factor correction circuit 2 is used to perform power factor correction on the input signal of the power grid and output the current signal after power factor correction; the LLC circuit 3 is used to perform DC conversion on the current signal after power factor correction to obtain DC power to charge the battery of the vehicle.

[0043] like Figure 2 As shown, the power factor correction circuit 2 may include: a third phase bridge arm composed of a first switch tube T1 and a second switch tube T2, and a fourth phase bridge arm composed of a third switch tube T3 and a fourth switch tube T4, wherein the midpoint of the third phase bridge arm is connected to the positive electrode of the power grid 1 through the inductor L1, and the midpoint of the fourth phase bridge arm is connected to the negative electrode of the power grid 1; the third bus terminals of the third phase bridge arm and the fourth phase bridge arm are connected to one end of the bus capacitor C1, and the fourth bus terminals of the third phase bridge arm and the fourth phase bridge arm are connected to the other end of the bus capacitor C1.

[0044] Among them, the current voltage on the AC side of the charger is u a , the current on the AC side of the charger is i a , the bus capacitor voltage is Ubus.

[0045] like Figure 2 As shown, the LLC circuit 3 includes an inverter circuit 31, a resonant circuit 32 and a rectifier circuit 33 which are connected in sequence.

[0046] Among them, the inverter circuit 31 includes: a first phase bridge arm composed of a fifth switch tube T5 and a sixth switch tube T6, and a second phase bridge arm composed of a seventh switch tube T7 and an eighth switch tube T8, the first bus ends of the first phase bridge arm and the second phase bridge arm are respectively connected to one end of the bus capacitor C1 and the above-mentioned third bus end, and the second bus ends of the first phase bridge arm and the second phase bridge arm are respectively connected to the other end of the bus capacitor C1 and the above-mentioned fourth bus end.

[0047] The resonant circuit 32 adopts an LLC type resonant cavity, including a resonant inductor L2, a resonant capacitor C2 and a transformer M1. Among them, the resonant inductor L2 has one end connected to the midpoint of the first phase bridge arm, and the other end connected to the first input end of the primary side of the transformer M1, wherein the resonant inductor L2 can be magnetically integrated with the transformer M1 and participate in the resonance in the resonant circuit; the resonant capacitor C2 has one end connected to the midpoint of the second phase bridge arm, and the other end connected to the second input end of the primary side of the transformer M1, and the resonant capacitor C2 can be selected from a film capacitor or a ceramic capacitor to prevent the transformer M1 from having a DC bias and participating in the resonance in the resonant circuit; the transformer M1 can be a tapped transformer, which is used to perform power isolation transmission.

[0048] The rectifier circuit 33 includes a fifth-phase bridge arm composed of a first diode D1 and a second diode D2, a sixth-phase bridge arm composed of a third diode D3 and a fourth diode D4, and a filter capacitor C3. The midpoint of the fifth-phase bridge arm is connected to the first output terminal of the secondary side of the transformer M1, and the midpoint of the sixth-phase bridge arm is connected to the second output terminal of the secondary side of the transformer M1; the fifth bus terminals of the fifth-phase bridge arm and the sixth-phase bridge arm are respectively connected to one end of the filter capacitor C3 and the positive electrode of the battery 4, and the sixth bus terminals of the fifth-phase bridge arm and the sixth-phase bridge arm are respectively connected to the other end of the filter capacitor C3 and the negative electrode of the battery 4. The filter capacitor C3 is a battery-side capacitor used for battery-side DC voltage filtering.

[0049] In addition, it should be noted that the rectifier circuit 33 can be a switch tube device or a rectifier diode (such as Figure 2 ), to achieve the transmission of electrical energy.

[0050] The following is a detailed description of the charger control method applied to the charger. Figure 3 As shown, the method may include the following S301 to S305.

[0051] In S301, the current voltage, current current and bus capacitor voltage of the AC side of the charger are obtained.

[0052] In the present disclosure, the current voltage on the AC side can be determined by the current voltage digital signal (Analog to Digital, AD) value of the AC side of the charger collected by the AC side sampling circuit, and the current current on the AC side can be determined by the current current digital signal (Analog to Digital, AD) value of the AC side collected by the AC side sampling circuit. Among them, the voltage AD value is converted by an analog to digital converter (Analog to Digital Converter, ADC) to obtain the corresponding digital signal value, and the current AD value is converted by ADC to obtain the corresponding digital signal value.

[0053] In one implementation, the current voltage corresponding to the current voltage AD can be determined by utilizing the conversion relationship between the voltage on the AC side and the voltage AD value; the current current corresponding to the current current AD can be determined by utilizing the conversion relationship between the current on the AC side and the current AD value.

[0054] For example, the voltage on the AC side=k1*the voltage AD value on the AC side+b1; the current on the AC side=k2*the current AD value on the AC side+b2.

[0055] In S302 , the steady-state target current and the current correction amount on the AC side are determined.

[0056] In the present disclosure, the steady-state target current is the current value that the AC side of the charger should correspond to when the charger is in a stable and efficient optimal working state.

[0057] In S303, the target current value of the AC side is determined according to the current voltage and the steady-state target current.

[0058] In the present disclosure, the current voltage u a (i.e., the voltage of the grid output current), extract the phase of the AC output of the grid; for example, the product of the steady-state target current and the phase of the AC output of the grid can be determined as the target current value. Figure 4 As shown, if the steady-state target current is I a_ref , the phase of the AC power output from the power grid determined by the phase-locked loop is coswt, then I a_ref *coswt is the target current value I a_ref1 .

[0059] In S304, the target current value is corrected using the current correction amount.

[0060] For example, Figure 4 As shown, the target current value I a_ref1 The difference between the current correction value IacAjust and the target current value IacAjust after correction is determined as a_ref2 .

[0061] In S305 , the current on the AC side is controlled according to the target current value obtained after correction, the current voltage, the current current and the bus capacitor voltage, so that the current on the AC side follows the target current value obtained after correction.

[0062] Specifically, if Figure 4 As shown, the bus capacitor voltage Ubus and the current voltage u a Input into the divider to obtain the feedforward u of the closed-loop control result a / Ubus; at the same time, the target current value I a_ref2 With the current i a , input into the controller to obtain the feedback of the closed-loop control result; then, the difference between the feedforward amount and the feedback amount is used as the modulation wave, and is transmitted to the PWM generator together with the carrier to obtain the duty cycle of the power factor correction circuit (PFC). Finally, the duty cycle of the power factor correction circuit can be adjusted so that the current on the AC side follows the corrected target current value, thereby realizing power factor correction.

[0063] In the above technical solution, first, the target current value of the AC side is determined according to the current voltage and steady-state target current of the AC side of the charger; then, the target current value is corrected using the current correction amount; finally, the current on the AC side is controlled according to the target current value obtained after correction, the current voltage on the AC side, the current current on the AC side, and the bus capacitor voltage, so that the current on the AC side follows the target current value obtained after correction, thereby achieving power factor correction. Among them, correcting the target current value using the current correction amount can ensure the accuracy of the target current value obtained after correction, so that the current on the AC side closely follows the target current value obtained after correction, avoiding deviations in the positive and negative half-cycle currents on the AC side, and achieving the ultimate purpose of adjusting the actual current balance of the AC side, that is, achieving dynamic balance of the AC current.

[0064] The specific implementation method of determining the steady-state target current of the AC side in the above S302 is described in detail below. Specifically, it can be achieved by the following steps (1) and (2):

[0065] (1) Determine the target charging power on the AC side.

[0066] In the present disclosure, the target charging power refers to the power on the AC side of the charger when the charger is in a stable and efficient optimal working state. Specifically, the target charging power can be determined as the minimum value of the maximum output power of the power grid, the current output power of the power grid, the maximum charging power allowed by the battery management system, the maximum power allowed by the cable, and the maximum charging power of the charger.

[0067] For example, the maximum output power of the power grid and the maximum power allowed by the cable can be determined according to the content of the national standard GBT18487.1-2015; the current output power of the power grid can be determined by the power sensor pre-set on the power grid; the maximum charging power allowed by the battery management system can be determined according to the relevant parameter information of the battery; the maximum charging power of the charger can be determined according to the hardware device selection of the charger, that is, it belongs to the inherent attribute parameter of the charger. The above-mentioned powers to be selected are the maximum power corresponding to the power grid, battery, cable, charger and the current output power of the power grid. Therefore, the minimum value is selected as the target charging power. On the one hand, it can ensure that the power grid, battery and cables used to connect the various parts of the charger are in a safe working state when the charger is working, reducing the possibility of damage to the electronic components on the related circuits; on the other hand, it can ensure that the power on the AC side of the charger can reach its maximum value while ensuring the safety of work. Therefore, if the power on the AC side of the charger is the target charging power, the charger can be in a stable and efficient optimal working state.

[0068] (2) Determine the steady-state target current on the AC side based on the target charging power.

[0069] In the present disclosure, the steady-state target current on the AC side is a current value determined according to the target charging power. The steady-state target current can be determined according to the quotient of the target charging power and the effective value of the AC voltage output by the power grid.

[0070] The following is a detailed description of the specific implementation of determining the current correction amount on the AC side in the above S302. Specifically, it can be achieved by the following steps [1] and [2]:

[0071] [1] Continuously sampling the current on the AC side a first preset number of times according to a first sampling period.

[0072] In the present disclosure, the first preset number of times may be any set value, for example, 100, or an integer multiple of the quotient of the AC side current cycle and the first sampling cycle, wherein the first sampling cycle is much smaller than the AC side current cycle.

[0073] [2] Determine a current correction amount on the AC side based on the current on the AC side for a first preset number of times.

[0074] In one implementation, an average value of the current on the AC side for a first preset number of times may be determined as the current correction amount on the AC side.

[0075] In addition, from the analysis of the sampling circuit principle on the AC side, the key factors affecting sampling include the resistance of the voltage-divider resistor in the sampling circuit and the power supply of the sampling Hall or operational amplifier. The difference in the resistance of the voltage-divider resistor can be compensated by modifying the sampling formula, but the Hall or operational amplifier will be affected by the board-level power supply. The output characteristics are affected because of the AC voltage and current. Since both AC voltage and current are AC quantities, the identification of the zero-crossing point is very important. If the power supply voltage deviates, it will cause the zero-point reference deviation of the sampling, resulting in control errors, causing deviations in the current of the positive and negative half cycles, and resulting in an imbalance in the AC current.

[0076] Therefore, in order to further improve the dynamic balance of the AC current, in addition to correcting the target current value during the charger operation, the AC side sampling circuit can also be zero-calibrated before the charger starts working to avoid zero-point offset caused by voltage instability and improve the dynamic balance of the AC current. Specifically, the above method can also include the following steps:

[0077] When the charger is powered on, the AC side sampling circuit is calibrated to zero point.

[0078] In the present disclosure, the charger includes three processes, namely power-on, operation, and power-off. The AC voltage (i.e., the power grid) is connected to the charger to power on the charger, and the AC voltage is disconnected to power off the charger. The process of the charger charging the vehicle battery is the work process.

[0079] Specifically, the zero point correction of the AC side sampling circuit can be performed in a variety of ways.

[0080] In one implementation, the sampling voltage AD value of the AC side sampling circuit is corrected to achieve zero point correction of the AC side sampling circuit.

[0081] Specifically, the voltage AD value of the AC side can be continuously collected for a second preset number of times according to the second sampling period; then, the correction amount of the sampled voltage AD value of the AC side sampling circuit is determined according to the voltage AD value of the AC side for the second preset number of times; finally, the sampled voltage AD value is corrected according to the correction amount of the sampled voltage AD value.

[0082] The second preset number may be any set value, for example, 100, or an integer multiple of the quotient of the AC side current cycle and the second sampling cycle, wherein the second sampling cycle is much smaller than the AC side current cycle.

[0083] By way of example, the average value of the voltage AD value on the AC side for a second preset number of times can be determined as the correction amount of the sampled voltage AD value of the AC side sampling circuit; and the difference between the sampled voltage AD value and the correction amount of the sampled voltage AD value can be determined as the sampled voltage AD value obtained after correction.

[0084] In another implementation, the sampling current AD value of the AC side sampling circuit is corrected to achieve zero point correction of the AC side sampling circuit.

[0085] Specifically, the current AD value of the AC side can be continuously collected for a second preset number of times according to the second sampling period; then, the correction amount of the sampling current AD value of the AC side sampling circuit is determined according to the current AD value of the AC side for the second preset number of times; finally, the sampling current AD value is corrected according to the correction amount of the sampling current AD value.

[0086] By way of example, the average value of the current AD value on the AC side for a second preset number of times can be determined as the correction amount of the sampling current AD value of the AC side sampling circuit; and the difference between the sampling current AD value and the correction amount of the sampling current AD value can be determined as the sampling current AD value obtained after correction.

[0087] In yet another implementation, the sampled voltage AD value and the sampled current AD value of the AC side sampling circuit are corrected to achieve zero point correction of the AC side sampling circuit.

[0088] Specifically, the voltage AD value and current AD value of the AC side can be continuously collected for a second preset number of times according to the second sampling period; then, the correction amount of the sampled voltage AD value of the AC side sampling circuit is determined according to the voltage AD value of the AC side for the second preset number of times, and the correction amount of the sampled current AD value of the AC side sampling circuit is determined according to the current AD value of the AC side for the second preset number of times; finally, the sampled voltage AD value is corrected according to the correction amount of the sampled voltage AD value, and the sampled current AD value is corrected according to the correction amount of the sampled current AD value.

[0089] In addition, the charger control device 5 may include:

[0090] a memory having a computer program stored thereon;

[0091] The computer program, when executed by the controller, implements the steps of the charger control method provided by the present disclosure.

[0092] The present disclosure also provides a vehicle, comprising the above charger provided by the present disclosure.

[0093] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0094] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0095] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A charger control method, applied to a charger, wherein the charger is a vehicle charger or a charging pile charger, characterized in that: include: Obtain the current voltage, current and bus capacitor voltage on the AC side of the charger; Determining a steady-state target current and a current correction amount on the AC side; Determining a target current value of the AC side according to the current voltage and the steady-state target current; Correcting the target current value using the current correction amount; According to the target current value obtained after correction, the current voltage, the current current and the bus capacitor voltage, the current on the AC side is controlled so that the current on the AC side follows the target current value obtained after correction; The controlling of the current on the AC side according to the target current value obtained after correction, the current voltage, the current current and the bus capacitor voltage so that the current on the AC side follows the target current value obtained after correction comprises: Inputting the bus capacitor voltage and the current voltage into a divider to obtain a feedforward amount of a closed-loop control result, and inputting the corrected target current value and the current current into a controller to obtain a feedback amount of the closed-loop control result, wherein the feedforward amount is equal to the current voltage divided by the bus capacitor voltage; The difference between the feedforward amount and the feedback amount is used as a modulation wave and transmitted to a PWM generator together with a carrier wave to obtain a duty cycle of a power factor correction circuit; By adjusting the duty cycle of the power factor correction circuit, the current on the AC side follows the target current value obtained after the correction, so as to achieve power factor correction.

2. The method according to claim 1, characterized in that The determining of the current correction amount on the AC side includes: Continuously collecting the current on the AC side a first preset number of times according to a first sampling period; The current correction amount of the AC side is determined according to the current of the AC side for the first preset number of times.

3. The method according to claim 2, characterized in that The step of determining the current correction amount on the AC side according to the current on the AC side for the first preset number of times includes: An average value of the current on the AC side for the first preset number of times is determined as the current correction amount on the AC side.

4. The method according to claim 2, characterized in that: The first preset number is an integer multiple of the quotient of the AC side current cycle and the first sampling cycle, wherein the first sampling cycle is much smaller than the AC side current cycle.

5. The method according to any one of claims 1 to 4, characterized in that The obtaining of the current voltage and current of the AC side of the charger includes: The current voltage on the AC side is determined by the current voltage AD value on the AC side of the charger collected by the AC side sampling circuit, and the current current on the AC side is determined by the current current AD value on the AC side collected by the AC side sampling circuit; The method further comprises: When the charger is powered on, a zero point calibration is performed on the AC side sampling circuit.

6. The method according to claim 5, characterized in that The zero point correction of the AC side sampling circuit comprises: The sampled voltage AD value and / or the sampled current AD value of the AC side sampling circuit are corrected to achieve zero point correction of the AC side sampling circuit.

7. The method according to claim 6, characterized in that The correcting of the sampled voltage AD value and / or the sampled current AD value of the AC side sampling circuit includes: Continuously collecting the voltage AD value and / or current AD value of the AC side a second preset number of times according to a second sampling period; Determine the correction amount of the sampled voltage AD value of the AC side sampling circuit according to the voltage AD value of the AC side for the second preset number of times, and / or determine the correction amount of the sampled current AD value of the AC side sampling circuit according to the current AD value of the AC side for the second preset number of times; The sampled voltage AD value is corrected according to the correction amount of the sampled voltage AD value, and / or the sampled current AD value is corrected according to the correction amount of the sampled current AD value.

8. A charger control device, characterized in that: include: a memory having a computer program stored thereon; A controller, wherein when the computer program is executed by the controller, the steps of the method according to any one of claims 1 to 7 are implemented.

9. A charger, comprising a power factor correction circuit, a bus capacitor and an LLC circuit connected in sequence, characterized in that: The charger also includes: The charger control device according to claim 8, wherein the charger control device is connected to the power factor correction circuit and the LLC circuit respectively.

10. A vehicle, characterized in that: The device comprises a battery and a charger according to claim 9.

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