Self-adaptive current sharing control method, system, equipment and medium

Abstract

The invention provides a self-adaptive current sharing control method, system and device and a medium. The control method comprises the following steps: acquiring output voltage and output current of each LLC module connected in parallel; subtracting the output voltage of each LLC module from the voltage reference value to obtain a first error signal; subtracting the output current of each LLC module from the current reference value to obtain a second error signal; according to the first error signal and the second error signal, a duty ratio control signal and a frequency control signal are generated through a double-feedback channel; and finally, based on the duty ratio control signal and the frequency control signal, dynamically selecting or superposing a PWM control mode and a PFM control mode to generate a driving signal, and adjusting a switching tube of each LLC module through the driving signal, thereby realizing uniform distribution of output current, ensuring stable output voltage, avoiding the situation that a single module bears all loads, and improving the reliability of the system. The service life of power devices is prolonged, and the overall operation reliability of the system is improved.

Description

Technical Field

[0001] This application relates to the field of power electronics control technology, and particularly relates to an adaptive current sharing control method, system, device, and medium. Background Art

[0002] With the rapid development of new energy technology, the scale of energy storage devices and various new energy grid connections is gradually expanding. Due to its high efficiency characteristics, the LLC resonant converter has become one of the mainstream converter modules. However, the capacity of a single LLC resonant converter is limited by component parameters and topological structures, making it difficult to meet large-capacity requirements. Although parallel operation can increase the overall system capacity and reduce the output current ripple, in actual engineering, due to manufacturing process deviations, component aging, and other factors, the parameter differences among modules are significant, resulting in serious unevenness of the output current of the parallel system.

[0003] In the prior art, there are significant defects in single pulse width modulation (PWM) or pulse frequency adjustment (PFM) control. PWM control is inefficient and has large losses under light load, and PFM control has insufficient dynamic response under heavy load, making it difficult to adapt to a wide load range. In addition, the current sharing error of traditional parallel systems can reach 100% under light load (i.e., a single module bears all the loads), shortening the lifespan of power devices and reducing system reliability. Summary of the Invention

[0004] The purpose of this application is to address the above problems and provide an adaptive current sharing control method, system, device, and medium.

[0005] In a first aspect, this application provides an adaptive current sharing control method, including the following steps: S1: Collect the output voltage and output current of each LLC module connected in parallel; S2: Compare the output voltage of each LLC module with a voltage reference value, calculate the difference, and obtain a first error signal; S3: Compare the output current of each LLC module with a current reference value, calculate the difference, and obtain a second error signal; S4: According to the first error signal and the second error signal, generate a duty cycle control signal and a frequency control signal respectively through double feedback channels; S5: Based on the duty cycle control signal and the frequency control signal, dynamically select or superimpose the PWM control mode and the PFM control mode to generate a drive signal; S6: Adjust the switching tubes of each LLC module through the drive signal to achieve equal sharing of the output current and stabilize the output voltage.

[0006] According to the technical solution provided by the present application, the dual feedback channels include: a voltage control loop and a current sharing control loop; the voltage control loop is used to stabilize the output voltage, and the current sharing control loop is used to ensure that the output currents of each LLC module are evenly distributed; Step S4 includes the following steps: S41: Based on the first error signal, generate the frequency control signal through the voltage control loop; S42: Based on the second error signal, generate the duty cycle control signal through the current sharing control loop.

[0007] According to the technical solution provided by the present application, before step S2, the following steps are further included: S11: According to the output currents of each LLC module, calculate the current reference value using formula one; Formula one; Where: is the current reference value, is the number of LLC modules, is the total value of the output currents of n LLC modules.

[0008] According to the technical solution provided by the present application, the voltage control loop includes: a first PI module and a VCO module; Step S41 includes the following steps: S411: Based on the first error signal, control the first PI module to generate a frequency adjustment signal; S412: Based on the frequency adjustment signal, control the VCO module to generate the frequency control signal.

[0009] According to the technical solution provided by the present application, the current sharing control loop includes: a second PI module and a duty cycle control module; Step S42 includes the following steps: S421: Based on the second error signal, control the second PI module to generate a duty cycle adjustment signal; S422: Based on the duty cycle adjustment signal, control the duty cycle control module to generate the duty cycle control signal.

[0010] According to the technical solution provided by the present application, the dynamic selection or superposition of the PWM control mode and the PFM control mode includes: The PFM control mode is preferentially adopted under light load conditions, the PWM control mode is preferentially adopted under heavy load conditions, and a fast dynamic response is achieved through a PWM and PFM hybrid control mode during load mutation.

[0011] According to the technical solution provided by the present application, the voltage reference value is a fixed target value.

[0012] In a second aspect, the present application provides an adaptive current sharing control system, including: An acquisition module, which is used to acquire the output voltage and output current of each parallel-connected LLC module; A first processing module, which is used to compare the output voltage of each LLC module with a voltage reference value, calculate the difference, and obtain a first error signal; A second processing module, which is used to compare the output current of each LLC module with a current reference value, calculate the difference, and obtain a second error signal; A dual feedback channel, which is used to generate a duty cycle control signal and a frequency control signal according to the first error signal and the second error signal; A driving module, which is used to dynamically select or superimpose a PWM control mode and a PFM control mode based on the duty cycle control signal and the frequency control signal, generate a driving signal, and adjust the switching tubes of each LLC module through the driving signal to achieve equal sharing of the output current and stabilize the output voltage.

[0013] In a third aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the adaptive current sharing control method according to any one of the first aspect.

[0014] In a fourth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, wherein when the computer program is executed by a processor, it implements the adaptive current sharing control method according to any one of the first aspect.

[0015] Compared with the prior art, the beneficial effects of the present application are: The present application provides an adaptive current sharing control method, system, device and medium. The adaptive current sharing control method includes the following steps: First, collect the output voltages and output currents of each parallel-connected LLC module; Subsequently, compare the output voltage of each LLC module with the voltage reference value, calculate the difference, and obtain the first error signal; Compare the output current of each LLC module with the current reference value, calculate the difference, and obtain the second error signal; According to the first error signal and the second error signal, generate a duty cycle control signal and a frequency control signal respectively through a dual feedback channel; Finally, based on the duty cycle control signal and the frequency control signal, dynamically select or superimpose the PWM control mode and the PFM control mode to generate a drive signal, and adjust the switching tubes of each LLC module through the drive signal to achieve an even distribution of the output current and ensure a stable output voltage. It can be seen from this that the present application generates a duty cycle control signal and a frequency control signal respectively through a dual feedback channel, and dynamically selects or superimposes the PWM control mode and the PFM control mode, overcoming the problems of low efficiency and large losses in the single PWM control under light load, and insufficient dynamic response in the single PFM control under heavy load, and can adapt to the control requirements of a wide load range. At the same time, it realizes the precise equal sharing of the output currents of each LLC module in the parallel system, avoids the situation where a single module bears all the loads, reduces the power device losses, prolongs the service life of the power devices, and improves the overall operation reliability of the system.

[0016] It should be understood that the description of technical features, technical solutions, beneficial effects or similar languages in the present application does not imply that all features and advantages can be achieved in any single embodiment. On the contrary, it can be understood that the description of features or beneficial effects means that at least one embodiment includes specific technical features, technical solutions or beneficial effects. Therefore, the description of technical features, technical solutions or beneficial effects in this specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and beneficial effects described in this embodiment can be combined in any appropriate manner. Those skilled in the art will understand that an embodiment can be implemented without one or more specific technical features, technical solutions or beneficial effects of a specific embodiment. In other embodiments, additional technical features and beneficial effects can also be identified in specific embodiments that do not embody all embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in this embodiment, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1Flowchart of an adaptive current sharing control method provided by an embodiment of the present application; Figure 2 Schematic diagram of two LLC modules connected in parallel provided by an embodiment of the present application; Figure 3 Schematic diagram of the PWM and PFM hybrid control mode provided by an embodiment of the present application; Figure 4 Schematic diagram of an adaptive current sharing control system provided by an embodiment of the present application; Figure 5 Schematic diagram of a computer system of an electronic device provided by an embodiment of the present application.

[0019] In the figure: 1. Acquisition module; 2. First processing module; 3. Second processing module; 4. Third processing module; 5. First PI module; 6. Second PI module; 7. VCO module; 8. Duty cycle control module; 9. Driver module; 401. CPU; 402. ROM; 403. RAM; 404. Bus; 405. I / O interface; 406. Input part; 407. Output part; 408. Storage part; 409. Communication part; 410. Driver; 411. Removable medium. Detailed implementation manners

[0020] In order to enable those skilled in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any restrictive effect on the protection scope of the present application. Specifically, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these process, method, product or device.

[0022] In order to make the technical solutions of the present application clearer and easier to understand, an adaptive current sharing control method provided by an embodiment of the present application will be introduced below.

[0023] It should be noted that this method can be executed by a terminal. For the sake of easy understanding, the method will be introduced from the perspective of the terminal below.

[0024] As Figure 1 shown, this embodiment provides an adaptive current sharing control method, which includes the following steps: S1: Collect the output voltages and output currents of each parallel-connected LLC module; S2: Compare the output voltage of each LLC module with the voltage reference value, calculate the difference, and obtain the first error signal; S3: Compare the output current of each LLC module with the current reference value, calculate the difference, and obtain the second error signal; S4: According to the first error signal and the second error signal, generate a duty cycle control signal and a frequency control signal respectively through double feedback channels; S5: Based on the duty cycle control signal and the frequency control signal, dynamically select or superimpose the PWM control mode and the PFM control mode to generate a drive signal; S6: Adjust the switching tubes of each LLC module through the drive signal to achieve equal sharing of the output current and stabilize the output voltage.

[0025] Specifically, in the PWM control mode, the drive signal is mainly determined by the duty cycle control signal; the duty cycle control signal adjusts the conduction time (duty cycle) of the switching tube, thereby controlling the output voltage or output current; Specifically, in the PFM control mode, the drive signal is mainly determined by the frequency control signal; the frequency control signal adjusts the switching frequency of the switching tube, thereby controlling the output power, and further controlling the output voltage or output current; Specifically, in the PWM and PFM hybrid control mode, the frequency control signal and the duty cycle control signal can be superimposed through mathematical operations (such as addition or multiplication) to generate a composite signal; this composite signal can then be converted into a drive signal through a digital-to-analog converter (DAC), and the drive signal is a square wave signal, and the high-level signal of the square wave controls the conduction of the switching tube (in this embodiment, the switching tube is Figure 2 S1, S2, S3, S4, S5, S6, S7, S8 in), and the low-level signal controls the turn-off of the switching tube; Specifically, in this embodiment, the output voltages of each parallel-connected LLC module are collected in real time through a voltage sensor; the output currents of each parallel-connected LLC module are collected in real time through a current sensor; Specifically, in this embodiment, as Figure 2As shown, two LLC modules are connected in parallel. Therefore, the output voltages of the two LLC modules are the same. However, due to factors such as component parameter differences and control strategy effects, the output currents of the two LLC modules are not the same. Therefore, in this application, the voltage reference value is a fixed target value to meet the load demand and stabilize the output voltage, thereby ensuring the stability of the output voltage under different load conditions and avoiding the impact of voltage fluctuations on the load.

[0026] Working principle: This application generates a duty cycle control signal and a frequency control signal through two feedback channels, dynamically selects or superimposes the PWM control mode and the PFM control mode, overcomes the problems of low efficiency and large losses in the single PWM control under light load, and insufficient dynamic response in the single PFM control under heavy load, and can adapt to the control requirements of a wide load range. At the same time, it realizes the accurate equal sharing of the output currents of each LLC module in the parallel system, avoids the situation where a single module bears all the loads, reduces the power device losses, prolongs the service life of the power devices, and improves the overall operation reliability of the system.

[0027] In some embodiments, before step S2, the following steps are further included: S11: Calculate the current reference value according to the output currents of each LLC module using Formula 1; Formula 1; Where: is the current reference value, is the number of LLC modules, is the total value of the output currents of n LLC modules.

[0028] Specifically, the load current may change with the load conditions. Therefore, the current reference value needs to be dynamically adjusted according to the output current detected in real time to ensure the real-time performance and accuracy of the current sharing control. Therefore, in this embodiment, before step S2, first calculate the average value of the output currents according to the output currents of each LLC module using the formula as the current reference value. Subsequently, calculate the difference between the output current of each LLC module and the current reference value, and adjust the output current of each LLC module to the current reference value through the current sharing control loop to achieve the equal distribution of the output currents of each LLC module.

[0029] In some embodiments, the two feedback channels include: a voltage control loop and a current sharing control loop; the voltage control loop is used to stabilize the output voltage, and the current sharing control loop is used to ensure the equal sharing of the output currents of each LLC module; Step S4 includes the following steps: S41: Generate a frequency control signal through the voltage control loop based on the first error signal; S42: Generate a duty cycle control signal through a current sharing control loop based on the second error signal.

[0030] Specifically, the voltage control loop is implemented as follows: First, collect the output voltages of each LLC module, calculate the difference between the actual output voltage and the voltage reference value to form a first error signal; based on the first error signal, dynamically adjust the switching frequency through the frequency modulation logic of the voltage control loop to generate a frequency control signal; this frequency control signal is used to control the operating frequency of the switching transistor, and the output voltage is stabilized through frequency adjustment. Specifically, the working process of the current sharing control loop is as follows: First, collect the output currents of each LLC module, calculate the difference between the output currents of each LLC module and the current reference value to form a second error signal; this signal reflects the degree of current imbalance, and after being processed by the current sharing control loop, a duty cycle control signal is generated; the duty cycle control signal adjusts the duty cycle to real-time adjust the power output of each LLC module, forcing the output currents of each module to tend to be consistent, ensuring the current sharing accuracy when multiple modules are connected in parallel, and improving the system reliability and power density. Specifically, based on the above dual feedback channel design, the voltage control loop generates a frequency control signal to achieve stable control of the output voltage, and the current sharing control loop generates a duty cycle control signal to ensure current sharing among multiple modules. The two work together to significantly improve the system performance: on the one hand, the voltage control loop ensures the output voltage accuracy to meet the load's demand for voltage stability; on the other hand, the current sharing control loop improves the current sharing accuracy of multiple modules connected in parallel through PWM control, reduces the problem of uneven thermal stress, expands the system power capacity, and is applicable to high-reliability power supply system scenarios.

[0031] In some embodiments, the voltage control loop includes: a first PI module and a VCO module; Step S41 includes the following steps: S411: Control the first PI module to generate a frequency adjustment signal based on the first error signal; S412: Control the VCO module to generate a frequency control signal based on the frequency adjustment signal.

[0032] Specifically, as Figure 4 shown, the voltage control loop includes: a first PI module (proportional-integral module) and a VCO module (voltage-controlled oscillator module); the input end of the first PI module is used to receive the first error signal, and the output end of the first PI module is connected to the input end of the VCO module; the specific process is as follows: First, collect the output voltages of each LLC module, calculate the difference between the output voltage and the voltage reference value to form a first error signal , and the first PI module receives the first error signal , a frequency adjustment signal is generated through a proportional-integral algorithm , and its transfer function can be expressed as: , where is the proportional coefficient, is the integral coefficient; the proportional term provides a fast response and suppresses the instantaneous fluctuation of the output voltage; the integral term eliminates the steady-state error and ensures the long-term stability of the output voltage; Subsequently, the VCO module generates a frequency control signal according to the frequency adjustment signal , and generates a switching frequency by using Equation 2; Equation 2; where is the gain coefficient of the VCO module; When increases, decreases, and the energy transfer is increased to boost the output voltage; when decreases, increases, and the energy transfer is reduced to suppress the output voltage.

[0033] In some embodiments, the current sharing control loop includes: a second PI module and a duty cycle control module; Step S42 includes the following steps: S421: Based on the second error signal, control the second PI module to generate a duty cycle adjustment signal; S422: Based on the duty cycle adjustment signal, control the duty cycle control module to generate a duty cycle control signal.

[0034] Specifically, the current sharing control loop includes: a second PI module (proportional-integral module) and a duty cycle control module; the input end of the second PI module is used to receive the second error signal, and the output end of the second PI module is connected to the input end of the duty cycle control module; the specific process is as follows: First, collect the output currents of each LLC module, calculate the difference between the output current and the current reference value, and form a second error signal , the second PI module receives the second error signal , and generates a duty cycle adjustment signal through a proportional-integral algorithm, and its transfer function is: where is the gain of the PI link, is the proportional coefficient, is the integral coefficient; Subsequently, the duty cycle control module generates a duty cycle control signal D by using Equation 3, that is, the duty cycle Formula Three; Wherein, is the gain coefficient of the duty cycle control module; When the output current of a certain module is too large (for example ), the duty cycle adjustment signal decreases, and the duty cycle D decreases accordingly, reducing the energy transfer of this module; When the output current of a certain module is too small (for example ), the duty cycle adjustment signal increases, and the duty cycle D increases accordingly, increasing the energy transfer of this module; Specifically, in this embodiment, two LLC modules operate in parallel. The output current of module 1 is too large, and the output current of module 2 is too small; The voltage relationship after introducing the current sharing link is: ; The current difference is defined as ; The circulating current impedance characterizes the uneven degree of current distribution and is defined as:

[0035] Wherein: is the output voltage of module 1; is the output voltage of module 2; is the on-resistance of the secondary side diode; U ab is the input voltage of the resonant cavity; G PI is the gain of the PI link in the current sharing link; M is the gain of the resonant cavity; n is the turns ratio of the transformer in the LLC module; When the circulating current impedance approaches infinity, the system achieves ideal current sharing.

[0036] In some embodiments, dynamically selecting or superimposing the PWM control mode and the PFM control mode includes: Preferably adopt the PFM control mode under light load conditions, preferably adopt the PWM control mode under heavy load conditions, and achieve fast dynamic response through the PWM and PFM hybrid control mode during load mutation.

[0037] Specifically, the division between light load and heavy load is generally based on 50% of the system rated power, or it can also be divided by 50% of the module. When the load is lower than 50% of the system rated power, it is determined that the load is in the light load state; when the load is higher than 50% of the system rated power, it is determined that the load is in the heavy load state. The generation of load mutation may be due to a series of reasons such as sudden accidents, manual regulation of the load, or a fault in a certain module in the parallel system. Specifically, in applications with different working conditions such as wide-range output, there are limitations in the current sharing control for both the single PFM control mode and the PWM control mode. Through an independent current sharing control loop, it acts on the LLC module simultaneously with the voltage control loop to accelerate the dynamic response, and through a hybrid control mode of PWM and PFM, the defects of each control mode are complemented. This hybrid control mode also has high adaptability and flexibility, and can flexibly switch the control mode according to different working states and load conditions to achieve the best control effect, enabling the LLC module to have a fast response speed and high current sharing accuracy under load changes and wide output conditions. The principle of the hybrid control strategy is as Figure 3 shown. It can be seen from the figure that from t0 - t1 is the time period of PFM control. In this stage, the carrier signal can be a signal with a fixed frequency; from t1 - t2 is the time period of hybrid control of PWM and PFM. The output current and output voltage are used as feedback signals mainly for generating the modulation wave signal, and the reference values of the relevant current and voltage can be used for generating the carrier signal. These two signals are compared to generate the final drive signal.

[0038] As Figure 4 shown, this figure is a schematic diagram of an adaptive current sharing control system provided by this application. The system includes: The acquisition module 1 is used to acquire the output voltage and output current of each parallel-connected LLC module. The first processing module 2 is used to compare the output voltage of each LLC module with the voltage reference value, calculate the difference, and obtain the first error signal. The second processing module 3 is used to compare the output current of each LLC module with the current reference value, calculate the difference, and obtain the second error signal. The dual feedback channel is used to generate a duty cycle control signal and a frequency control signal according to the first error signal and the second error signal. The drive module 9 is used to dynamically select or superimpose the PWM control mode and the PFM control mode based on the duty cycle control signal and the frequency control signal, generate a drive signal, and adjust the switching tubes of each LLC module through the drive signal to achieve the equal sharing of the output current and stabilize the output voltage.

[0039] In this embodiment, optionally, it further includes: The dual feedback channels include a voltage control loop and a current sharing control loop. The voltage control loop is used to stabilize the output voltage, and the current sharing control loop is used to ensure that the output currents of each LLC module are evenly distributed; The voltage control loop is used to generate a frequency control signal according to the first error signal; The current sharing control loop is used to generate a duty cycle control signal according to the second error signal; In this embodiment, optionally, it further includes: The third processing module 4 is used to calculate the current reference value according to the output currents of each LLC module by using Formula 1; Formula 1; Where: is the current reference value, is the number of LLC modules, is the total value of the output currents of n LLC modules; In this embodiment, optionally, it further includes: The voltage control loop includes a first PI module 5 and a VCO module 7; The first PI module 5 is used to generate a frequency adjustment signal based on the first error signal; The VCO module 7 is used to generate a frequency control signal based on the frequency adjustment signal.

[0040] In this embodiment, optionally, it further includes: The current sharing control loop includes a second PI module 6 and a duty cycle control module 8; The second PI module 6 is used to generate a duty cycle adjustment signal based on the second error signal; The duty cycle control module 8 is used to generate a duty cycle control signal based on the duty cycle adjustment signal.

[0041] In this embodiment, optionally, it further includes: Dynamically selecting or superimposing the PWM control mode and the PFM control mode includes: The PFM control mode is preferentially adopted under light load conditions, the PWM control mode is preferentially adopted under heavy load conditions, and a fast dynamic response is achieved through a mixed PWM and PFM control mode during load mutation.

[0042] In this embodiment, optionally, it further includes: The voltage reference value is a fixed target value.

[0043] This application embodiment also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the adaptive current sharing control method as described in the above embodiment.

[0044] As shown Figure 5 in FIG., the computer system of the electronic device includes a CPU 401, which can perform various appropriate actions and processes according to the program stored in the ROM 402 or the program loaded into the RAM 403 from the storage section 408. In the RAM 403, various programs and data required for system operation are also stored. The CPU 401, ROM 402, and RAM 403 are connected to each other via a bus 404. An I / O interface 405 is also connected to the bus 404. Among them, the CPU 401 represents the central processing unit, the ROM 402 represents the read-only memory, the RAM 403 represents the random access memory, and I / O represents input / output.

[0045] The following components are connected to the I / O interface 405: an input section 406 including a keyboard, a mouse, etc.; an output section 407 including a cathode ray tube, a liquid crystal display, etc. and a speaker, etc.; a storage section 408 including a hard disk, etc.; and a communication section 409 including a network interface card such as a LAN card, a modem, etc. The communication section 409 performs communication processing via a network such as the Internet. A drive 410 is also connected to the I / O interface 405 as needed. A removable medium 411, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 410 as needed, so that a computer program read from it can be installed into the storage section 408 as needed.

[0046] Specifically, the process of the adaptive current sharing control method described in the above embodiments can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable storage medium, and the computer program contains program codes for executing the adaptive current sharing control method in the above embodiments. In such an embodiment, the computer program can be downloaded and installed from the network through the communication section 409, and / or installed from the removable medium 411. When the computer program is executed by the CPU 401, the above functions defined in this computer system are executed.

[0047] An embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the adaptive current sharing control method as described in the above embodiments is implemented.

[0048] Specifically, the computer-readable storage medium may be included in the electronic device described in the above embodiments; or it may exist separately without being assembled into the electronic device. The above computer-readable storage medium carries one or more programs, and when the above one or more programs are executed by an electronic device, the electronic device implements the adaptive current sharing control method as described in the above embodiments.

[0049] It should be noted that the computer-readable storage medium shown in the present application can be a computer-readable signal medium, a computer-readable storage medium, or any combination of the above two. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of the computer-readable storage medium can include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical fiber, a portable compact disk read-only memory, an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, the computer-readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or in combination with an instruction execution system, apparatus, or device. And in the present application, the computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, in which the computer-readable program code is carried. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above.

[0050] In this article, specific examples are used to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. The above is only the preferred implementation manner of the present application. It should be noted that due to the limited nature of language expression and the objectively infinite specific structures, for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements, refinements, or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes, or combinations, or directly applying the inventive concept and technical solution to other occasions without improvement, should all be regarded as the protection scope of the present application.

Claims

1. An adaptive current sharing control method, characterized in that: The steps include: S1: Collect the output voltage and output current of each LLC module connected in parallel; S2: Compare the output voltage of each LLC module with the voltage reference value, calculate the difference, and obtain a first error signal; S3: Compare the output current of each LLC module with the current reference value, calculate the difference, and obtain a second error signal; S4: Generate a frequency control signal and a duty cycle control signal through dual feedback channels according to the first error signal and the second error signal respectively; S5: Based on the duty cycle control signal and the frequency control signal, dynamically select or superimpose the PWM control mode and the PFM control mode to generate a drive signal; S6: adjusting the switch tubes of each LLC module through the driving signal to achieve even distribution of the output current and stabilize the output voltage.

2. The adaptive current sharing control method according to claim 1, characterized in that: The dual feedback channel includes: a voltage control loop and a current sharing control loop; the voltage control loop is used to stabilize the output voltage, and the current sharing control loop is used to ensure that the output current of each LLC module is evenly distributed; Step S4 includes the following steps: S41: generating the frequency control signal through the voltage control loop based on the first error signal; S42: Based on the second error signal, generate the duty cycle control signal through the current sharing control loop.

3. The adaptive current sharing control method according to claim 2, characterized in that: The following steps are also included before step S2: S11: Calculate the current reference value using formula 1 according to the output current of each LLC module; Formula 1; in: is the current reference value, is the number of LLC modules, is the total output current of n LLC modules.

4. The adaptive current sharing control method according to claim 2, characterized in that: The voltage control loop includes: a first PI module and a VCO module; Step S41 includes the following steps: S411: Based on the first error signal, control the first PI module to generate a frequency adjustment signal; S412: Based on the frequency adjustment signal, control the VCO module to generate the frequency control signal.

5. The adaptive current sharing control method according to claim 3, characterized in that: The current sharing control loop includes: a second PI module and a duty cycle control module; Step S42 includes the following steps: S421: Based on the second error signal, control the second PI module to generate a duty cycle adjustment signal; S422: Based on the duty cycle adjustment signal, control the duty cycle control module to generate a duty cycle control signal.

6. The adaptive current sharing control method according to claim 1, characterized in that: The dynamic selection or superposition of the PWM control mode and the PFM control mode includes: The PFM control mode is preferentially adopted under light load conditions, while the PWM control mode is preferentially adopted under heavy load conditions. In addition, a mixed control mode of PWM and PFM is used to achieve fast dynamic response when the load changes suddenly.

7. The adaptive current sharing control method according to claim 1, characterized in that: The voltage reference value is a fixed target value.

8. An adaptive current sharing control system, characterized in that: include: A collection module (1), the collection module (1) is used to collect the output voltage and output current of each LLC module connected in parallel; A first processing module (2), the first processing module (2) being used to compare the output voltage of each LLC module with a voltage reference value, calculate a difference, and obtain a first error signal; A second processing module (3), the second processing module (3) being used to compare the output current of each LLC module with the current reference value, calculate the difference, and obtain a second error signal; A dual feedback channel, the dual feedback channel is used to generate a duty cycle control signal and a frequency control signal according to the first error signal and the second error signal; A drive module (9), the drive module (9) being used to dynamically select or superimpose a PWM control mode and a PFM control mode based on a duty cycle control signal and a frequency control signal, generate a drive signal, and adjust the switch tubes of each LLC module through the drive signal to achieve even distribution of the output current and stabilize the output voltage.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the adaptive current sharing control method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the adaptive current sharing control method as described in any one of claims 1 to 7 is implemented.

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