Current balancing method, controller and related components of interleaved parallel LLC circuit

Abstract

The present invention discloses a current balancing method, controller and related components of an interleaved parallel LLC circuit, relates to the technical field of interleaved parallel LLC circuits, and solves the current balancing problem caused by device differences in an interleaved parallel LLC resonant circuit. By sampling the current difference or voltage difference of two resonant cavities for closed-loop calculation, a duty cycle adjustment variable is generated in real time, and then it is determined which resonant cavity is not balancing the current, so as to determine the target resonant cavity to be balancing the current; the current operating frequency is compared with the resonant frequency to determine whether the current operating frequency is within the first preset range or exceeds the range, so as to select a suitable switch tube for duty cycle adjustment to balance the current of the two resonant cavities. It can be seen that the present application can accurately locate the switch tube that needs to be adjusted in the full frequency range, ensure the accuracy of the current balancing control, effectively reduce the output current ripple, and prevent a certain resonant cavity from being overloaded, thereby improving the stability and reliability of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of interleaved parallel LLC circuits, and in particular to a current equalization method, a controller and related components of an interleaved parallel LLC circuit. Background Art

[0002] The application of LLC (Inductor-Inductor-Capacitor Resonant Circuit) circuit in high-power charging module usually adopts staggered series-parallel design to reduce output current ripple. Specifically, the control signals of the two resonant cavities are of the same frequency and staggered at a certain angle, so that the output ripple can be reduced, thereby achieving the effect of reducing cost and size. However, in the actual application of staggered parallel connection, due to objective factors such as device differences, the problem of uneven current in the two paths often occurs. If this uneven current phenomenon is not handled, it may cause one of the resonant cavities to overload, thereby damaging the system.

[0003] As the voltage regulation range continues to expand, how to control the current equalization of the resonant circuit within the full frequency range has become a key technical difficulty. Summary of the invention

[0004] The purpose of the present invention is to provide a current balancing method, a controller and related components for an interleaved parallel LLC circuit, which can accurately locate the switch tube that needs to be adjusted for duty cycle within the full frequency range, thereby ensuring the accuracy of current balancing control, effectively reducing output current ripple, and preventing a certain resonant cavity from overloading, thereby improving the stability and reliability of the system.

[0005] In a first aspect, the present application provides a current balancing method for an interleaved parallel LLC circuit, wherein the LLC circuit includes two resonant cavities, and the current balancing method for the interleaved parallel LLC circuit includes:

[0006] Performing a closed-loop operation on the real-time current difference or voltage difference of the two resonant cavities of the LLC circuit to obtain a duty cycle adjustment variable; wherein the current difference is the difference between the current of the first resonant cavity and the current of the second resonant cavity, and the voltage difference is the difference between the voltage of the first resonant cavity and the voltage of the second resonant cavity;

[0007] Acquire a current operating frequency of the LLC circuit, compare the current operating frequency with the resonant frequency of the LLC circuit, and obtain a frequency comparison result, wherein the frequency comparison result includes one of the following: the current operating frequency is within a first preset range of the resonant frequency, is less than a minimum value within the first preset range, and is greater than a maximum value within the first preset range;

[0008] Determine a target resonant cavity to be processed for current balancing according to the duty cycle adjustment variable, and determine a target switch tube to be adjusted in the target resonant cavity according to the frequency comparison result and a first preset relationship, wherein the first preset relationship includes a corresponding relationship between the frequency comparison result and the switch tube to be adjusted;

[0009] The duty cycle of the target switch tube is adjusted so that the current difference or voltage difference between the two resonant cavities is within a second preset range.

[0010] Optionally, adjusting the duty cycle of the target switch tube so that the current difference or voltage difference between the two resonant cavities is within a second preset range includes:

[0011] A target adjustment method is determined according to the frequency comparison result and a second preset relationship, and the duty cycle of the target switch tube is adjusted in the target adjustment method according to the duty cycle adjustment variable.

[0012] Optionally, determining a target resonant cavity to be processed for current balancing according to the duty cycle adjustment variable includes:

[0013] When the duty cycle adjustment variable is greater than zero, determining the first resonant cavity as the target resonant cavity;

[0014] When the duty cycle adjustment variable is less than zero, the second resonant cavity is determined to be the target resonant cavity.

[0015] Optionally, determining a target switch tube to be adjusted in the target resonant cavity according to the frequency comparison result and a first preset relationship includes:

[0016] When the current operating frequency is less than the minimum value within the first preset range, or when the current operating frequency is within the first preset range, determining that all switch tubes in the target resonant cavity are the target switch tubes;

[0017] When the current operating frequency is greater than the maximum value of the first preset range, it is determined that the switch tube corresponding to the upper bridge arm in the target resonant cavity is the target switch tube.

[0018] Optionally, adjusting the duty cycle of the target switch tube in the target adjustment manner according to the duty cycle adjustment variable includes:

[0019] When the current operating frequency is not less than the minimum value of the first preset range, determining the effective duty cycle according to the current operating frequency and the preset adjustment slope;

[0020] The duty cycle of the target switch tube is adjusted in the target adjustment manner according to the effective duty cycle and the duty cycle adjustment variable.

[0021] Optionally, determining the effective duty cycle according to the current operating frequency and a preset adjustment slope includes:

[0022] Determining an effective duty cycle to be compared according to a preset duty cycle, the current operating frequency and a preset adjustment slope;

[0023] The effective duty cycle is determined according to the effective duty cycle to be compared and a lower limit value of a preset effective duty cycle.

[0024] Optionally, adjusting the duty cycle of the target switch tube in the target adjustment manner according to the effective duty cycle and the duty cycle adjustment variable includes:

[0025] When the current operating frequency is within the first preset range, the duty cycle of the first target switch tube is adjusted according to the formula Dpwm1=Deff-|Dreg|; wherein the first target switch tube is the switch tube of the upper bridge arm in the target resonant cavity, Dpwm1 is the duty cycle of the first target switch tube after adjustment, Deff is the effective duty cycle, and Dreg is the duty cycle adjustment variable;

[0026] The duty cycle of the second target switch tube is adjusted according to the formula Dpwm2=a-|Dreg|×b, where the second target switch tube is the switch tube of the lower bridge arm in the target resonant cavity;

[0027] Among them, Dpwm2 is the adjusted duty cycle of the second target switch tube, a is the preset duty cycle of the target switch tube, b is the transition factor, b is negatively correlated with the current operating frequency, and b is a value between 0 and 1.

[0028] Optionally, adjusting the duty cycle of the target switch tube in the target adjustment manner according to the effective duty cycle and the duty cycle adjustment variable includes:

[0029] When the current operating frequency is greater than the maximum value within the first preset range, the duty cycle of the target switch tube is adjusted according to the formula Dpwm3=Deff-|Dreg|, and the duty cycles of other switch tubes in the target resonant cavity except the target switch tube are determined to be a;

[0030] Wherein, Dpwm3 is the duty cycle of the target switch tube after adjustment, a is the preset duty cycle of the target switch tube, Deff is the effective duty cycle, and Dreg is the duty cycle adjustment variable.

[0031] Optionally, adjusting the duty cycle of the target switch tube in the target adjustment manner according to the duty cycle adjustment variable includes:

[0032] When the current operating frequency is less than the minimum value within the first preset range, the duty cycle of the target switch is adjusted according to the formula Dpwm4=a-Dreg;

[0033] Wherein, Dpwm4 is the duty cycle of the target switch tube after adjustment, a is the preset duty cycle of the target switch tube, and Dreg is the duty cycle adjustment variable.

[0034] Optionally, after performing a closed-loop operation on the real-time current difference or voltage difference of the two resonant cavities of the LLC circuit to obtain the duty cycle adjustment variable, the method further includes:

[0035] comparing the duty cycle adjustment variable with a duty cycle adjustment maximum value and a duty cycle adjustment minimum value;

[0036] When the duty cycle adjustment variable is greater than the duty cycle adjustment maximum value, assigning the duty cycle adjustment maximum value to the duty cycle adjustment variable;

[0037] When the duty cycle adjustment variable is less than the duty cycle adjustment minimum value, the duty cycle adjustment minimum value is assigned to the duty cycle adjustment variable.

[0038] In a second aspect, the present application provides a current sharing controller for a resonant circuit, comprising:

[0039] Memory for storing computer programs;

[0040] The processor is used to implement the steps of the current sharing method of the staggered parallel LLC circuit as described above when storing the computer program.

[0041] In a third aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the current equalization method for the staggered parallel LLC circuit as described above are implemented.

[0042] In a fourth aspect, the present application provides an interleaved parallel LLC circuit, comprising a current sharing controller of the resonant circuit as described above, wherein the current sharing controller of the resonant circuit is connected to the interleaved parallel LLC circuit.

[0043] The present invention provides a current balancing method, controller and related components of an interleaved parallel LLC circuit, which relates to the technical field of interleaved parallel LLC circuits, and solves the current balancing problem caused by device differences in interleaved parallel LLC resonant circuits. By sampling the current difference or voltage difference of the two resonant cavities for closed-loop calculation, a duty cycle adjustment variable is generated in real time, and then it is determined which resonant cavity is not balancing the current, so as to determine the target resonant cavity to be balancing the current; the current operating frequency is compared with the resonant frequency to determine whether the current operating frequency is within the first preset range or exceeds the range, so as to select a suitable switch tube for duty cycle adjustment to balance the current of the two resonant cavities. It can be seen that the present application can accurately locate the switch tube that needs to be duty cycle adjusted within the full frequency range, ensure the accuracy of the current balancing control, effectively reduce the output current ripple, and prevent a certain resonant cavity from being overloaded, thereby improving the stability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 A structural topology diagram of an LLC circuit provided by the present invention;

[0046] Figure 2 A switch tube driving waveform diagram during frequency modulation control of an LLC circuit provided by the present invention;

[0047] Figure 3 A switch tube driving waveform diagram during limited bipolar control of an LLC circuit provided by the present invention;

[0048] Figure 4 A flow chart of a current sharing method for an interleaved parallel LLC circuit provided by the present invention;

[0049] Figure 5 The present invention provides a specific flow chart of a current sharing method for an interleaved parallel LLC circuit. DETAILED DESCRIPTION

[0050] The core of the present invention is to provide a current balancing method, controller and related components for an interleaved parallel LLC circuit, which can accurately locate the switch tube that needs to be adjusted for duty cycle within the full frequency range, thereby ensuring the accuracy of current balancing control, effectively reducing output current ripple, and preventing a certain resonant cavity from overloading, thereby improving the stability and reliability of the system.

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Publication No. CN108365755B provides a current balancing method when working above the resonant frequency under the premise of ensuring the same frequency interleaving. The method realizes current balancing by inserting a zero vector to change the input voltage of the resonant cavity. However, this method can only correctly balance the current when working above the resonant frequency. Although the input voltage is changed when working below the resonant frequency, current balancing is still not correctly achieved.

[0053] Publication No. CN113098278A also provides a full-frequency range current balancing method under the premise of ensuring the same-frequency interleaving. The adjustment increment of each phase is calculated by obtaining the branch current of each phase LLC branch, and then the duty cycle of the driving signal of the secondary synchronous rectifier of each phase is adjusted. This method can effectively achieve power balance of each phase LLC branch at a low cost. However, this method does not act on the switching devices of the LLC circuit, but utilizes the adjustment function of the secondary synchronous rectifier. Therefore, this solution is obviously only applicable to circuits using synchronous rectifiers on the secondary side, which increases the cost of the secondary circuit. This solution is not applicable to circuits using rectifier diodes on the secondary side that cannot control the turn-on angle.

[0054] When a wider voltage range regulation is required, the operating frequency of the LLC will be below or above the resonant frequency. In the prior art, when an uncontrolled rectifier circuit is used on the secondary side of the parallel LLC circuit, current balancing cannot be correctly achieved in the full frequency range.

[0055] To solve the above technical problems, in the first aspect, the present application provides a current balancing method for an interleaved parallel LLC circuit, wherein the LLC circuit includes two resonant cavities. Figure 1 The structure of the LLC circuit in the scheme is introduced and explained. It can be understood that in addition to Figure 1 In addition to adjusting the LLC circuit of the structure shown, LLC circuits of other structures can also be adjusted. Figure 1In the two resonant cavities, the upper bridge arm switch tubes (such as Q1 and Q3, Q5 and Q7 are used for frequency modulation and width modulation), the lower bridge arm switch tubes (such as Q2 and Q4, Q6 and Q7 are used for frequency modulation), and the corresponding PWM (Pulse Width Modulation) signal under each switch tube is its corresponding control signal. For example, the control signal of Q1 is PWM1A. Figure 2 and Figure 3 In the embodiment, PWM1A corresponds to EPWM1A, and so on. The description of other switch tubes and their corresponding control signals will not be repeated in this application.

[0056] The wave generation strategy used below the resonant frequency is frequency modulation control, such as Figure 2 As shown, Figure 2 for Figure 1 From the signal waveforms of PWM1A, PWM1B, PWM2A, PWM2B, PWM3A, PWM3B, PWM4A, and PWM4B in one switching cycle, we can see that in the resonant cavity where L1 is located, the transmission angles of PWM1 and PWM2 differ by 180°, and the duty cycles are both 50%. In the resonant cavity where L2 is located, the transmission angles of PWM3 and PWM4 differ by 180°, and the duty cycles are both 50%. The total driving signal phase difference of the two resonant cavities is 90°. In general, Figure 2 In the resonant cavity, PFM (Pulse Frequency Modulation) control is adopted. The duty cycle of the switch tube in the same bridge arm in the same resonant cavity is 50%. The circuit gain is changed by synchronously adjusting the operating frequency of the switch tube. The switch tubes in the same bridge arm of the resonant cavity are adjusted by the equal current adjustment amount Dreg together. The switch tubes in different bridge arms of the same resonant cavity are staggered 180 degrees to generate waves. When the switch tubes in different resonant cavities generate waves, they are staggered 90 degrees to generate waves, so that the output current ripple can be minimized.

[0057] The wave generation strategy adopted above the resonant frequency is limited bipolar, such as Figure 3 As shown, Figure 2 for Figure 1From the signal waveforms of PWM1A, PWM1B, PWM2A, PWM2B, PWM3A, PWM3B, PWM4A, and PWM4B in one switching cycle, we can see that the total phase difference of the driving signals of the two resonant cavities is still 90°. The difference is: in the resonant cavity where L1 is located, the pulse width of the driving signals PWM1A and PWM2A of the upper bridge arms Q1 and Q3 is adjustable, while the pulse width of the driving signals PWM2B and PWM1B of the lower bridge arms Q2 and Q4 is not adjustable (fixed at 50% duty cycle); in the resonant cavity where L2 is located, the pulse width of the driving signals PWM3A and PWM4A of the upper bridge arms Q5 and Q7 is adjustable, while the pulse width of the driving signals PWM4B and PWM3B of the lower bridge arms Q6 and Q8 is not adjustable (fixed at 50% duty cycle). In general, Figure 3 In the resonant cavity, PFM+PWM control (pulse frequency modulation + pulse width modulation) is adopted. The operating frequency of the switch tubes in the same bridge arm in the same resonant cavity is synchronously adjusted (PFM). The duty cycle of the switch tubes in the frequency-modulated bridge arm is always 50%, and the duty cycle of the switch tubes in the frequency-modulated bridge arm is also adjusted by the effective duty cycle Deff while the frequency is modulated. In the same bridge arm of the resonant cavity subject to the current equalization adjustment amount Dreg, the switch tubes in different bridge arms in the same resonant cavity are staggered 180 degrees to generate waves. When the switch tubes in different resonant cavities generate waves, they are staggered 90 degrees to generate waves, so that the output current ripple can be minimized.

[0058] like Figure 4 As shown, the current sharing method of the interleaved parallel LLC circuit includes:

[0059] S11: Perform closed-loop calculation on the real-time current difference or voltage difference of the two resonant cavities of the LLC circuit to obtain a duty cycle adjustment variable; wherein the current difference is the difference between the current of the first resonant cavity and the current of the second resonant cavity, and the voltage difference is the difference between the voltage of the first resonant cavity and the voltage of the second resonant cavity.

[0060] This step monitors the current or voltage difference between the two resonant cavities in real time, which is the basis for realizing current sharing control. Through closed-loop operation, the current difference or voltage difference between the first resonant cavity and the second resonant cavity can be accurately calculated, and these differences reflect the load conditions of each resonant cavity. When the difference is detected, the duty cycle adjustment variable will be obtained according to the closed-loop operation of the difference, so that the LLC circuit can be processed for current sharing based on this duty cycle adjustment variable in the subsequent steps.

[0061] Among them, when the LLC circuit (that is, the resonant circuit) is controlled to share the current, it is necessary to sample the current or voltage of the two resonant cavities of the resonant circuit to obtain the real-time current difference or voltage difference of each resonant cavity in the LLC circuit. Taking the sampling current as an example, it can be but not limited to sampling the current of the two resonant cavities of the resonant circuit through the sampling unit A (for example, a sampling circuit or a current transformer), and the obtained sampling currents are I1 and I2 respectively. A closed-loop operation is performed based on the difference between I1 and I2 to obtain the duty cycle adjustment variable. Specifically, the real-time current difference of the two resonant cavities of the LLC circuit is obtained, including: based on the formula e (0) = I1-I2, the real-time current difference e (0) of the two resonant cavities of the resonant circuit in the current adjustment cycle is calculated, wherein I1 is the sampling current of the first resonant cavity of the resonant circuit, and I2 is the sampling current of the second resonant cavity of the resonant circuit. The difference e (0) is directly used as the error factor during PI adjustment.

[0062] Furthermore, when performing closed-loop calculation on the sampled current of the resonant cavity of the resonant circuit, those skilled in the art may select an appropriate calculation method to perform closed-loop calculation, for example, Figure 5 As shown, in this scheme, the PI algorithm can be used to perform closed-loop operation on the sampling current of the resonant cavity of the resonant circuit. At this time, the specific process of the closed-loop operation includes: taking the difference of the sampling current of the current cycle and the difference of the sampling current collected in the previous cycle as input variables, performing PI calculation, and taking the calculation result of the PI calculation as the duty cycle adjustment variable. Specifically, based on the difference of the sampling current in the current adjustment cycle and the difference of the sampling current collected in the previous cycle, the PI calculation is performed, including: using the formula Dreg (0) = Dreg (1) + kp × e (0) - ki × e (1) to perform PI calculation to obtain the duty cycle adjustment variable Dreg, wherein Dreg (1) is the duty cycle adjustment variable of the previous cycle, kp is the proportional adjustment coefficient, ki is the integral adjustment coefficient, e (0) is the real-time current difference in the current adjustment cycle, and e (1) is the current difference collected in the previous cycle. In this embodiment, in order to ensure the reliability of the sampling result, the sampling current can be filtered, and then the filtered sampling data can be calculated by PI.

[0063] S12: Obtain the current operating frequency of the LLC circuit, compare the current operating frequency with the resonant frequency of the LLC circuit, and obtain a frequency comparison result, wherein the frequency comparison result includes one of the current operating frequency being within a first preset range of the resonant frequency, being less than a minimum value within the first preset range, and being greater than a maximum value within the first preset range.

[0064] This step obtains the current operating frequency of the LLC circuit and compares it with the resonant frequency of the circuit. The core purpose of this process is to divide the operating frequency into different frequency bands. Specifically, it can include but is not limited to the three frequency bands of the current operating frequency within the first preset range of the resonant frequency, less than the minimum value within the first preset range, and greater than the maximum value within the first preset range, so as to adopt appropriate current balancing processing methods for each frequency band. Since the LLC circuit has different dynamic characteristics and load responses at different frequencies, the current operating frequency is identified and classified into specific frequency bands so that the control method can be more accurate. Through the division of this frequency band, different adjustment methods can be applied in a targeted manner, so as to more effectively achieve current balancing, reduce output current ripple, improve the stability and reliability of the system, and ensure the current balancing control effect within the full frequency range.

[0065] S13: determining a target resonant cavity to be processed for current balancing according to the duty cycle adjustment variable, and determining a target switch tube to be adjusted in the target resonant cavity according to the frequency comparison result and a first preset relationship, wherein the first preset relationship includes a corresponding relationship between the frequency comparison result and the switch tube to be adjusted.

[0066] This step determines the target switch in the target resonant cavity based on the frequency comparison result of the duty cycle adjustment variable obtained in the previous step and the current operating frequency. The purpose of this step is to identify the uneven load and select the resonant cavity that needs to be adjusted most (usually the resonant cavity with a larger current value or a larger voltage value is used as the target resonant cavity, so as to reduce the current or voltage of the target resonant cavity), so as to perform more targeted current sharing control. By combining the duty cycle adjustment variable with the state of the resonant cavity, the system can ensure that the most relevant resonant cavity is adjusted at the appropriate time, thereby effectively improving the load balance of the overall circuit.

[0067] Specifically, the target resonant cavity is determined according to the duty cycle adjustment variable. The design idea of ​​this process is to preferentially identify the resonant cavity with uneven load. The duty cycle adjustment variable is positive or negative, which reflects which resonant cavity has a larger current or voltage. Through the pre-set adjustment strategy (such as only adjusting the resonant cavity with a larger current to reduce the current of the resonant cavity), this variable can be effectively pointed to the resonant cavity that needs to be adjusted first to achieve current sharing control. Next, the target switch tube in the target resonant cavity is further determined according to the frequency comparison result and the first preset relationship. The role of this step is to optimize the specific adjustment method. The frequency comparison result provides the relationship between the current operating frequency and the resonant frequency, and can identify the dynamic response characteristics of the resonant cavity at different frequencies. By combining these two information, not only can the resonant cavity that needs to be adjusted the most be selected, but also the target switch tube that should be adjusted can be accurately locked in the resonant cavity. This method effectively improves the flexibility and response speed of current sharing control, ensures that the system can maintain good load balancing under various working conditions, reduce current ripple, and enhance the stability and reliability of the overall system.

[0068] It should be understood that the first preset relationship provides a clear correspondence between the frequency comparison result and the switch tube to be adjusted, ensuring that the appropriate switch tube can be accurately selected and adjusted at different frequencies. The use of this preset relationship enables the system to reasonably allocate resources by analyzing the frequency state and current difference in actual applications, thereby effectively reducing output ripple and preventing device overload.

[0069] As a preferred embodiment, the target resonant cavity to be processed by current balancing is determined according to the duty cycle adjustment variable, including: when the duty cycle adjustment variable is greater than zero, determining the first resonant cavity as the target resonant cavity; when the duty cycle adjustment variable is less than zero, determining the second resonant cavity as the target resonant cavity.

[0070] In this preferred embodiment, the target resonant cavity is dynamically selected by the duty cycle adjustment variable, and the specific design idea is to indicate the resonant cavity that needs to be adjusted by judging the sign of the variable. When the duty cycle adjustment variable is greater than zero, it means that the output of the first resonant cavity is relatively high, so the first resonant cavity is determined to be the target resonant cavity, so as to make appropriate adjustments, reduce its output and achieve load balancing; conversely, when the duty cycle adjustment variable is less than zero, the output of the second resonant cavity is relatively high, and the second resonant cavity is determined to be the target resonant cavity for adjustment. This selection mechanism based on the duty cycle adjustment variable can quickly respond to changes in circuit state, realize real-time current sharing control, avoid overload and damage of a single resonant cavity, and improve the overall stability and reliability of the system. Through this precise determination method, it can be flexibly adjusted under different working conditions to ensure that the load distribution between the resonant cavities is more reasonable, thereby effectively reducing the output current ripple.

[0071] S14: adjusting the duty cycle of the target switch tube so that the current difference or voltage difference between the two resonant cavities is within a second preset range.

[0072] This step actually adjusts the duty cycle of the target switch tube in the target resonant cavity to dynamically adjust the working state of the switch tube. By real-time monitoring of the current or voltage difference and combining it with the formulated adjustment method, the working conditions of the resonant cavity can be effectively optimized within the full frequency range, thereby achieving current equalization control, reducing output current ripple, and improving system stability and reliability.

[0073] It should be noted that due to the wave structure, the duty cycle of each switch in the LLC circuit cannot be greater than 50% (actually, the dead zone must be considered). Therefore, in this solution, no duty cycle increase is made, only duty cycle reduction is made. Therefore, after the target switch is determined, the duty cycle of the target switch is reduced based on the original duty cycle, and the amount of reduction is determined according to the duty cycle adjustment variable.

[0074] In summary, the current balancing method for the staggered parallel LLC circuit provided in the present application can accurately locate the switch tube that needs to be duty cycle adjusted within the full frequency range, thereby ensuring the accuracy of current balancing control, effectively reducing the output current ripple, and preventing a certain resonant cavity from overloading, thereby improving the stability and reliability of the system.

[0075] Based on the above embodiments:

[0076] As a preferred embodiment, the target switch tube to be adjusted in the target resonant cavity is determined according to the frequency comparison result and the first preset relationship, including: when the current operating frequency is less than the minimum value within the first preset range, or when the current operating frequency is within the first preset range, all the switch tubes in the target resonant cavity are determined to be the target switch tubes; when the current operating frequency is greater than the maximum value of the first preset range, the switch tube corresponding to the upper bridge arm in the target resonant cavity is determined to be the target switch tube.

[0077] Specifically, the first preset range of the resonant frequency is set to be greater than the difference between the resonant frequency and the preset frequency variable and less than the sum of the resonant frequency and the preset frequency variable, the resonant frequency is fr, the preset frequency variable is , the current operating frequency is f, if f <fr- , or, fr- <f<fr+ , then all the switch tubes in the target resonant cavity are adjusted, that is, all the switch tubes are used as the target switch tubes. , then only the two switch tubes corresponding to the upper bridge arm in the target resonant cavity are used as target switch tubes, and only the duty ratio of the two switch tubes in the upper bridge arm is adjusted.

[0078] As a preferred embodiment, the duty cycle of the target switch tube is adjusted in a target adjustment manner according to the duty cycle adjustment variable, including: when the current operating frequency is not less than the minimum value of the first preset range, the effective duty cycle is determined according to the current operating frequency and the preset adjustment slope; the duty cycle of the target switch tube is adjusted in a target adjustment manner according to the effective duty cycle and the duty cycle adjustment variable.

[0079] In this preferred embodiment, the duty cycle of the target switch tube in the target resonant cavity is dynamically adjusted by combining the duty cycle adjustment variable and the frequency comparison result. When the current operating frequency is not less than the minimum value of the first preset range (that is, the difference between the resonant frequency and the preset frequency variable), the effective duty cycle is first calculated based on the current operating frequency and the preset adjustment slope. The effective duty cycle refers to the optimal duty cycle value allowed under specific operating conditions to ensure the normal operation of the circuit. It takes into account the impact of frequency changes on the performance of the resonant cavity and is used to optimize the working state of the switch tube. By combining the effective duty cycle with the duty cycle adjustment variable, the duty cycle of the switch tube in the target resonant cavity can be accurately adjusted in a determined target adjustment manner to achieve current sharing control.

[0080] This embodiment ensures that under different frequencies, it can quickly adapt to load changes, effectively reduce output current ripple, and avoid damage to the switch tube due to overload, thereby improving the stability and reliability of the entire circuit. Through real-time adjustment, the system can maintain the optimal performance of the resonant cavity and ensure efficient energy conversion and distribution.

[0081] As a preferred embodiment, the effective duty cycle is determined according to the current operating frequency and the preset adjustment slope, including: determining the effective duty cycle to be compared according to the preset duty cycle, the current operating frequency and the preset adjustment slope; determining the effective duty cycle according to the effective duty cycle to be compared and the lower limit value of the preset effective duty cycle.

[0082] In this preferred embodiment, the effective duty cycle to be compared is calculated by a preset duty cycle, a current operating frequency, and a preset adjustment slope. The design idea of ​​this step is to dynamically adjust the duty cycle according to the change of the current operating frequency and the set adjustment slope to optimize the performance of the resonant cavity. The effective duty cycle to be compared represents the optimal duty cycle value expected by the system under the current operating conditions. Next, the system compares the effective duty cycle to be compared with the lower limit value of the preset effective duty cycle to ensure that the calculated effective duty cycle is not lower than this lower limit value.

[0083] Specifically, in a preferred embodiment, the effective duty cycle is determined according to the formula Deff=af×Kf and Deff=max(Deff, Deff_min); wherein Deff is the effective duty cycle, a is the preset duty cycle, f is the current operating frequency, Kf is the preset adjustment slope, Def_min is the lower limit of the effective duty cycle, and max(Deff, Deff_min) means taking the larger value of Deff and Deff_min.

[0084] In this embodiment, the determination of the effective duty cycle is intended to prevent the system from having too low a duty cycle when the load fluctuates or the operating frequency changes, thereby causing the resonant cavity to fail to work properly or become unstable. This method can ensure that the target switch tube always remains within a reasonable duty cycle range under various working conditions, thereby improving the stability and reliability of the circuit, while effectively reducing the output current ripple and ensuring the efficient operation of the resonant circuit.

[0085] As a preferred embodiment, the duty cycle of the target switch tube is adjusted in a target adjustment manner according to the duty cycle adjustment variable, including: when the current operating frequency is less than the minimum value within the first preset range, the duty cycle of the target switch tube is adjusted according to the formula Dpwm4=a-Dreg; wherein Dpwm4 is the adjusted duty cycle of the target switch tube, a is the preset duty cycle of the target switch tube, and Dreg is the duty cycle adjustment variable.

[0086] Specifically, when the current operating frequency is less than the minimum value in the first preset range (ie, the difference between the resonant frequency and the preset frequency variable) (ie, f <fr- ), Dreg simultaneously reduces the duty cycle of the frequency modulation bridge arm and the frequency modulation width modulation bridge arm switch tubes (that is, simultaneously reduces the two switch tubes of the upper bridge arm and the two switch tubes of the lower bridge arm), and the duty cycle of the two is consistent. When Dreg is greater than 0, the duty cycle of Q1, Q2, Q3, and Q4 of the first resonant cavity is adjusted to decrease, and when Dreg is less than 0, the duty cycle of Q5, Q6, Q7, and Q8 of the second resonant cavity is adjusted to decrease.

[0087] When designing a resonant circuit, the duty cycle of the switch tubes in the same bridge arm in the same resonant cavity is 50%, and the switch tubes in different bridge arms in the same resonant cavity are staggered 180 degrees to generate waves. When the switch tubes in different resonant cavities generate waves, they are staggered 90 degrees to generate waves, so that the current ripple output by the resonant circuit can be minimized. Therefore, in the above scheme disclosed in this embodiment, the value of a can be defined as 50%. Of course, users can also configure a to other values ​​according to their actual needs.

[0088] As a preferred embodiment, the duty cycle of the target switch tube is adjusted in a target adjustment manner according to the effective duty cycle and the duty cycle adjustment variable, including: when the current operating frequency is greater than the maximum value within the first preset range, the duty cycle of the target switch tube is adjusted according to the formula Dpwm3=Deff-|Dreg|, and the duty cycles of other switch tubes in the target resonant cavity except the target switch tube are determined to be a; wherein Dpwm3 is the duty cycle of the target switch tube after adjustment, a is the preset duty cycle of the target switch tube, Deff is the effective duty cycle, and Dreg is the duty cycle adjustment variable.

[0089] Specifically, when the current operating frequency is greater than the maximum value within the first preset range (that is, the sum of the resonant frequency and the preset frequency variable) (f>fr+ ), the effective duty cycle Deff is calculated according to the current operating frequency and the preset adjustment slope, and Dreg directly reduces the duty cycle of the frequency modulation and width modulation bridge arm switch tube (that is, adjusts the two switch tubes of the lower bridge arm). Specifically, when Dreg is greater than 0, the duty cycle of Q1 and Q3 of the first resonant cavity is adjusted; when Dreg is less than 0, the duty cycle of Q5 and Q7 of the second resonant cavity is adjusted, and the duty cycle a of the frequency modulation bridge arm switch tube remains unchanged at 50%.

[0090] As a preferred embodiment, the duty cycle of the target switch tube is adjusted in a target adjustment manner according to the effective duty cycle and the duty cycle adjustment variable, including: when the current operating frequency is within the first preset range, the duty cycle of the first target switch tube is adjusted according to the formula Dpwm1=Deff-|Dreg|; wherein the first target switch tube is the switch tube of the upper bridge arm in the target resonant cavity, Dpwm1 is the duty cycle of the first target switch tube after adjustment, Deff is the effective duty cycle, and Dreg is the duty cycle adjustment variable; according to the formula Dpwm2=a-|Dreg|×b, the duty cycle of the second target switch tube is adjusted, and the second target switch tube is the switch tube of the lower bridge arm in the target resonant cavity; wherein Dpwm2 is the duty cycle of the second target switch tube after adjustment, a is the preset duty cycle of the target switch tube, and b is a transition factor, b is negatively correlated with the current operating frequency, and b is a value between 0 and 1.

[0091] In this preferred embodiment, the duty cycle of the target switch tubes of the upper bridge arm and the lower bridge arm in the target resonant cavity is adjusted according to the effective duty cycle, the duty cycle adjustment variable and the frequency comparison result. When the current operating frequency is in a specific interval, the first target switch tube (the switch tube of the upper bridge arm) is adjusted to optimize its working state according to the difference between the effective duty cycle and the duty cycle adjustment variable, thereby reducing the output current of the resonant cavity. This adjustment strategy ensures that the switch tube of the upper bridge arm can operate under the best working conditions through the dynamic adjustment of the effective duty cycle, effectively reduces the current ripple and improves the stability of the system. At the same time, the second target switch tube (the switch tube of the lower bridge arm) is adjusted. By adjusting the preset duty cycle and the transition factor, the duty cycle of the lower bridge arm switch tube can be dynamically adjusted according to the change of the current operating frequency to achieve smoother current distribution. The transition factor is negatively correlated with the current operating frequency, which means that when the frequency is high, the duty cycle of the lower bridge arm switch tube will be reduced to avoid possible overload and instability.

[0092] Specifically, when the current operating frequency is in the transition stage, that is, when the current operating frequency is not less than the difference between the resonant frequency and the preset frequency variable and not greater than the sum of the resonant frequency and the preset frequency variable (fr- <f<fr+ ), the transition factor b is smoothed from 1 to 0. The effective duty cycle Deff is calculated according to the current operating frequency and the preset adjustment slope, and Dreg directly reduces the duty cycle of the frequency modulation and width modulation bridge arm switch tube (that is, adjusts the duty cycle of the two switch tubes in the upper bridge arm). Specifically, when Dreg is greater than 0, the duty cycle of Q1 and Q3 in the first resonant cavity is adjusted, and when Dreg is less than 0, the duty cycle of Q5 and Q7 in the second resonant cavity is adjusted. Dreg×b reduces the duty cycle of the frequency modulation bridge arm switch tube (that is, adjusts the duty cycle of the two switch tubes in the lower bridge arm). Specifically, when Dreg is greater than 0, the duty cycle of Q2 and Q4 in the first resonant cavity is adjusted, and when Dreg is less than 0, the duty cycle of Q6 and Q8 in the second resonant cavity is adjusted.

[0093] In general, this dual-switch duty cycle adjustment method aims to effectively balance the current output of the target resonant cavity and reduce its current amplitude, thereby avoiding uneven current and overload, and ensuring the stability and reliability of the system under various working conditions. In addition, in this transition stage, the transition factor b is set to make the current change smoother and avoid current mutations.

[0094] As a preferred embodiment, after performing closed-loop calculation on the real-time current difference or voltage difference between the two resonant cavities of the LLC circuit to obtain the duty cycle adjustment variable, it also includes: comparing the duty cycle adjustment variable with the duty cycle adjustment maximum value and the duty cycle adjustment minimum value; when the duty cycle adjustment variable is greater than the duty cycle adjustment maximum value, assigning the duty cycle adjustment maximum value to the duty cycle adjustment variable; when the duty cycle adjustment variable is less than the duty cycle adjustment minimum value, assigning the duty cycle adjustment minimum value to the duty cycle adjustment variable.

[0095] In this preferred embodiment, after closed-loop operation of the sampled currents of the two resonant cavities of the LLC circuit, a duty cycle adjustment variable is obtained, and then the variable needs to be compared with the preset maximum and minimum values. The design idea of ​​this step is to ensure that the duty cycle adjustment variable is always within a reasonable range to avoid instability or damage to the circuit due to extreme values.

[0096] When the duty cycle adjustment variable is greater than the maximum value of the duty cycle adjustment, the duty cycle adjustment variable is assigned to the maximum value of the duty cycle adjustment to ensure that the adjusted duty cycle does not exceed the safety limit, thereby protecting the normal operation of the switch tube and the resonant cavity; on the contrary, when the duty cycle adjustment variable is less than the minimum value of the duty cycle adjustment, it is assigned to the minimum value to prevent the duty cycle from being too low, which may cause the resonant cavity to fail to work normally or reduce efficiency.

[0097] This method of limiting the duty cycle adjustment variable can maintain the stability and reliability of the system during the dynamic adjustment process, while optimizing the performance of the resonant cavity to ensure that good current characteristics can be maintained under various working conditions, thereby reducing current ripple and improving the safety and efficiency of the overall circuit. Through this mechanism, the system can adapt to different operating conditions and effectively avoid potential failure risks.

[0098] In a specific embodiment, the specific implementation process of the current balancing method can be but is not limited to the following: Figure 5 As shown:

[0099] (1) Calculate the real-time current difference between the two resonant cavities, that is, e(0) = I1-I2;

[0100] (2) Perform a closed-loop operation on the real-time current difference to obtain the duty cycle adjustment variable, that is, Dreg(0) = Dreg(1) + kp × e(0) - ki × e(1); let Dreg(1) = Dreg(0), e(1) = e(0), so as to enter the current sharing control of the next cycle.

[0101] (3) Compare the duty cycle adjustment variable Dreg(0) with the maximum value Dmax and the minimum value Dmin of the duty cycle adjustment variable. If Dreg(0) > Dmax, assign Dmax to the duty cycle adjustment variable. If Dreg(0) < Dmin, assign Dmin to the duty cycle adjustment variable to obtain the final duty cycle adjustment variable Dreg.

[0102] (4) Determine whether Dreg is greater than 0. If Dreg > 0, use the first resonant cavity as the target resonant cavity (i.e., Figure 1 the upper part), and determine the duty cycle adjustment amount of the target resonant cavity as |Dreg|. If Dreg < 0, use the second resonant cavity as the target resonant cavity (i.e., Figure 1 the lower part), and determine the duty cycle adjustment amount of the target resonant cavity as |Dreg|. The duty cycle adjustment amount of the non-target resonant cavity is 0.

[0103] (5) Further determine which frequency stage is in according to the current operating frequency, that is, determine whether f < fr - . If so, it indicates that the current operating frequency is below the resonant frequency, and perform frequency modulation control (PWM) on the target resonant cavity. Specifically, regard each switching tube in the target resonant cavity as the target switching tube, and reduce the duty cycle of each target switching tube by the duty cycle adjustment variable on the basis of the original 0.5.

[0104] (6) If f is not less than fr - , it is necessary to calculate the effective duty cycle Deff and adjust the duty cycle of the target switching tube according to the effective duty cycle and the frequency range of the current operating frequency.

[0105] (7) Specifically, if f > fr + , it indicates that the current operating frequency is below the resonant frequency, and perform finite bipolar control (PWM + PFM) on the target resonant cavity. At this time, determine the switching tube of the upper bridge arm in the target resonant cavity as the target switching tube, and reduce the duty cycle of the target switching tube by the duty cycle adjustment variable on the basis of the effective duty cycle. The duty cycle of the non-target switching tube remains 0.5 unchanged.

[0106] (8) If f > fr - , and f < fr + , it indicates that the current operating frequency is in the resonant frequency transition stage, and PWM+PFM control is adopted. At this time, all the switch tubes in the target resonant cavity are determined as the target switch tubes, but the duty cycle adjustment method for the switch tube in the upper bridge arm is: reduce the duty cycle adjustment variable on the basis of the effective duty cycle; the duty cycle adjustment method for the switch tube in the lower bridge arm is: subtract the product of the duty cycle adjustment variable and the transition factor b from the original 0.5, b is a value between 0-1, and as the current operating frequency gradually increases, b gradually decreases, making the duty cycle adjustment smoother.

[0107] In summary, the current balancing method provided in the present application can keep the current of the two resonant cavities of the LLC circuit with two parallel inputs balanced within the full frequency range, and by introducing a transition factor in the transition stage, the duty cycle adjustment is smoother, thereby improving the stability of the LLC circuit operation.

[0108] In a second aspect, the present application provides a current sharing controller for a resonant circuit, comprising:

[0109] Memory for storing computer programs;

[0110] The processor is used to implement the steps of the current balancing method of the resonant circuit as described above when storing the computer program. For other introductions to the current balancing controller of the resonant circuit, please refer to the above embodiments, and this application will not repeat them here.

[0111] In a third aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the current balancing method of the staggered parallel LLC circuit as described above are implemented. For other introductions to the computer-readable storage medium, please refer to the above embodiments, and the present application will not repeat them here.

[0112] In a fourth aspect, the present application provides an interleaved parallel LLC circuit, including a current balancing controller of the resonant circuit as described above, wherein the current balancing controller of the resonant circuit is connected to the interleaved parallel LLC circuit.

[0113] For further introduction to the staggered parallel LLC circuit, please refer to the above embodiments, which will not be described in detail in this application.

[0114] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0115] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A current balancing method for an interleaved parallel LLC circuit, wherein the LLC circuit comprises two resonant cavities, characterized in that: The current sharing method of the staggered parallel LLC circuit includes: Performing a closed-loop operation on the real-time current difference or voltage difference of the two resonant cavities of the LLC circuit to obtain a duty cycle adjustment variable; wherein the current difference is the difference between the current of the first resonant cavity and the current of the second resonant cavity, and the voltage difference is the difference between the voltage of the first resonant cavity and the voltage of the second resonant cavity; Acquire a current operating frequency of the LLC circuit, compare the current operating frequency with the resonant frequency of the LLC circuit, and obtain a frequency comparison result, wherein the frequency comparison result includes one of the following: the current operating frequency is within a first preset range of the resonant frequency, is less than a minimum value within the first preset range, and is greater than a maximum value within the first preset range; Determine a target resonant cavity to be processed for current balancing according to the duty cycle adjustment variable, and determine a target switch tube to be adjusted in the target resonant cavity according to the frequency comparison result and a first preset relationship, wherein the first preset relationship includes a corresponding relationship between the frequency comparison result and the switch tube to be adjusted; The duty cycle of the target switch tube is adjusted so that the current difference or voltage difference between the two resonant cavities is within a second preset range.

2. The current sharing method of the interleaved parallel LLC circuit according to claim 1, characterized in that: Adjusting the duty cycle of the target switch tube so that the current difference or voltage difference between the two resonant cavities is within a second preset range includes: A target adjustment method is determined according to the frequency comparison result and the second preset relationship, and the duty cycle of the target switch tube is adjusted in the target adjustment method according to the duty cycle adjustment variable, so that the current difference or voltage difference between the two resonant cavities is within the second preset range.

3. The current sharing method of the interleaved parallel LLC circuit according to claim 2, characterized in that: Determining a target resonant cavity to be processed for current balancing according to the duty cycle adjustment variable includes: When the duty cycle adjustment variable is greater than zero, determining the first resonant cavity as the target resonant cavity; When the duty cycle adjustment variable is less than zero, the second resonant cavity is determined to be the target resonant cavity.

4. The current sharing method of the interleaved parallel LLC circuit according to claim 2, characterized in that: Determining a target switch tube to be adjusted in the target resonant cavity according to the frequency comparison result and the first preset relationship includes: When the current operating frequency is less than the minimum value within the first preset range, or when the current operating frequency is within the first preset range, determining that all switch tubes in the target resonant cavity are the target switch tubes; When the current operating frequency is greater than the maximum value of the first preset range, it is determined that the switch tube corresponding to the upper bridge arm in the target resonant cavity is the target switch tube.

5. The current sharing method of the interleaved parallel LLC circuit according to claim 4, characterized in that: Adjusting the duty cycle of the target switch tube in the target adjustment manner according to the duty cycle adjustment variable includes: When the current operating frequency is not less than the minimum value of the first preset range, determining the effective duty cycle according to the current operating frequency and the preset adjustment slope; The duty cycle of the target switch tube is adjusted in the target adjustment manner according to the effective duty cycle and the duty cycle adjustment variable.

6. The current sharing method of the interleaved parallel LLC circuit according to claim 5, characterized in that: Determining an effective duty cycle according to the current operating frequency and a preset adjustment slope includes: Determining an effective duty cycle to be compared according to a preset duty cycle, the current operating frequency and a preset adjustment slope; The effective duty cycle is determined according to the effective duty cycle to be compared and a lower limit value of a preset effective duty cycle.

7. The current sharing method of the interleaved parallel LLC circuit according to claim 5, characterized in that: The method further comprises: adjusting the duty cycle of the target switch tube in the target adjustment manner according to the effective duty cycle and the duty cycle adjustment variable, comprising: When the current operating frequency is within the first preset range, the duty cycle of the first target switch tube is adjusted according to the formula Dpwm1=Deff-|Dreg|; wherein the first target switch tube is the switch tube of the upper bridge arm in the target resonant cavity, Dpwm1 is the duty cycle of the first target switch tube after adjustment, Deff is the effective duty cycle, and Dreg is the duty cycle adjustment variable; The duty cycle of the second target switch tube is adjusted according to the formula Dpwm2=a-|Dreg|×b, where the second target switch tube is the switch tube of the lower bridge arm in the target resonant cavity; Among them, Dpwm2 is the adjusted duty cycle of the second target switch tube, a is the preset duty cycle of the target switch tube, b is the transition factor, b is negatively correlated with the current operating frequency, and b is a value between 0 and 1.

8. The current sharing method of the interleaved parallel LLC circuit according to claim 5, characterized in that: The method further comprises: adjusting the duty cycle of the target switch tube in the target adjustment manner according to the effective duty cycle and the duty cycle adjustment variable, comprising: When the current operating frequency is greater than the maximum value within the first preset range, the duty cycle of the target switch tube is adjusted according to the formula Dpwm3=Deff-|Dreg|, and the duty cycles of other switch tubes in the target resonant cavity except the target switch tube are determined to be a; Wherein, Dpwm3 is the duty cycle of the target switch tube after adjustment, a is the preset duty cycle of the target switch tube, Deff is the effective duty cycle, and Dreg is the duty cycle adjustment variable.

9. The current sharing method of the interleaved parallel LLC circuit according to claim 4, characterized in that: Adjusting the duty cycle of the target switch tube in the target adjustment manner according to the duty cycle adjustment variable includes: When the current operating frequency is less than the minimum value within the first preset range, the duty cycle of the target switch is adjusted according to the formula Dpwm4=a-Dreg; Wherein, Dpwm4 is the duty cycle of the target switch tube after adjustment, a is the preset duty cycle of the target switch tube, and Dreg is the duty cycle adjustment variable.

10. The current sharing method of the interleaved parallel LLC circuit according to any one of claims 1 to 9, characterized in that: After performing a closed-loop operation on the real-time current difference or voltage difference of the two resonant cavities of the LLC circuit to obtain a duty cycle adjustment variable, the method further includes: comparing the duty cycle adjustment variable with a duty cycle adjustment maximum value and a duty cycle adjustment minimum value; When the duty cycle adjustment variable is greater than the duty cycle adjustment maximum value, assigning the duty cycle adjustment maximum value to the duty cycle adjustment variable; When the duty cycle adjustment variable is less than the duty cycle adjustment minimum value, the duty cycle adjustment minimum value is assigned to the duty cycle adjustment variable.

11. A current sharing controller for a resonant circuit, characterized in that: include: Memory for storing computer programs; A processor, used for implementing the steps of the current sharing method of the staggered parallel LLC circuit as described in any one of claims 1 to 10 when storing a computer program.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the current sharing method for the interleaved parallel LLC circuit as described in any one of claims 1 to 10 are implemented.

13. An interleaved parallel LLC circuit, characterized in that: It comprises a current sharing controller of the resonant circuit as claimed in claim 11, wherein the current sharing controller of the resonant circuit is connected to the staggered parallel LLC circuit.

Images