WO2024045365A1

WO2024045365A1 - Control method for resonant circuit, and control apparatus and readable storage medium

Info

Publication number: WO2024045365A1
Application number: PCT/CN2022/134076
Authority: WO
Inventors: 邱禹; 曾贤杰; 江海昊; 黄招彬
Original assignee: 广东美的制冷设备有限公司
Priority date: 2022-08-31
Filing date: 2022-11-24
Publication date: 2024-03-07
Also published as: CN117674604A

Abstract

Disclosed in the present invention are a control method for a resonant circuit, and a control apparatus and a readable storage medium. The control method comprises: acquiring a pulse width modulation response time (S100); controlling the operation of a primary full-bridge circuit according to the pulse width modulation response time (S200); each time an interruption control signal is detected, performing inverse accumulation on the pulse width modulation response time according to a preset threshold value (S300); and controlling the operation of the primary full-bridge circuit according to the pulse width modulation response time which has been subjected to inverse accumulation (S400).

Description

Control method, device and readable storage medium of resonant circuit

Cross-references to related applications

This application claims priority to the Chinese patent application with application number 202211052816. in this application.

Technical field

The present invention relates to the technical field related to resonant circuits, and in particular, to a control method, device and readable storage medium for a resonant circuit.

Background technique

In household energy storage converters (energy storage DC/DC), LLC resonant circuits are often used for multi-level conversion. LLC circuit, also known as series-parallel resonant circuit, is often used in the field of high-frequency power conversion. Because it is not suitable for wide input voltage range when used alone, it is often used in occasions with PFC in the front stage. Unlike traditional pulse width regulation converters, LLC is a resonant circuit that achieves constant output voltage by controlling the switching frequency. Therefore, it often uses a fixed duty cycle output during startup.

The traditional application scenarios based on fixed duty cycle output are limited, and if there are large capacitors at both ends of the circuit, a large current will flow through the switch tube when charging and discharging are started, causing burnout. Soft start can be achieved based on the full-bridge phase shifting method, but the configuration is complex, requires a lot of chip resources (3 MTU), and the implementation cost is high.

Contents of the invention

The present invention aims to solve one of the above technical problems at least to a certain extent. To this end, the present invention proposes a control method for a resonant circuit, which realizes soft start and effectively protects the switching tube without adding additional chip resources.

The present invention also provides a control device, an energy storage device, and a computer-readable storage medium for executing the above control method of a resonant circuit.

According to the control method of the resonant circuit according to the first embodiment of the present invention, the resonant circuit includes a primary side full-bridge circuit, and the control method includes:

Get pulse width modulation response time;

Control the operation of the primary-side full-bridge circuit according to the pulse width modulation response time;

Each time an interrupt control signal is detected, the pulse width modulation response time is cumulatively reduced according to a preset threshold;

The operation of the primary side full-bridge circuit is controlled according to the reduced pulse width modulation response time.

The control method according to the embodiment of the present invention has at least the following beneficial effects:

The pulse width modulation response time of this embodiment can control the operation of the primary-side full-bridge circuit according to its size. However, when the pulse width modulation response time is large, it will cause distortion of the output waveform and reduce the output efficiency, and pulse width modulation When the response time is small, the output waveform is better, but if the pulse width modulation response time is too small, it may cause problems such as burning of the switch tube and output short circuit. Therefore, this embodiment reduces the pulse width modulation response time cumulatively by interrupting the control signal. Continuously reducing the pulse width modulation response time can not only avoid the problem of switch tube burnout and output short circuit, but also continuously reduce the pulse width modulation response time, achieve the purpose of soft start, and make the output waveform better; this embodiment does not increase Any chip resources, low implementation cost.

According to some embodiments of the present invention, controlling the operation of the primary-side full-bridge circuit according to the pulse width modulation response time includes:

Calculate the operating duty cycle of the primary-side full-bridge circuit based on the pulse width modulation response time;

The operation of the primary side full-bridge circuit is controlled according to the operation duty cycle.

According to some embodiments of the present invention, controlling the operation of the primary-side full-bridge circuit based on the cumulative pulse width modulation response time includes:

Adjust the operating duty cycle according to the reduced pulse width modulation response time;

Control the operation of the primary side full-bridge circuit according to the adjusted operating duty cycle.

According to some embodiments of the present invention, the primary-side full-bridge circuit operates in a complementary pulse width modulation mode according to the pulse width modulation response time;

The adjusting the operating duty cycle according to the reduced pulse width modulation response time includes:

suspend operation of said complementary pulse width modulation mode;

The pulse width modulation response time after load accumulation and subtraction;

The complementary pulse width modulation mode is restarted, so that the accumulated pulse width modulation response time adjusts the operating duty cycle.

According to some embodiments of the present invention, controlling the operation of the primary-side full-bridge circuit according to the adjusted operating duty cycle further includes:

When the adjusted operating duty cycle reaches a preset duty cycle threshold, the cumulative reduction of the pulse width modulation response time is stopped.

According to some embodiments of the present invention, the operating duty cycle is calculated according to the following formula:

Wherein, the D is the operating duty cycle, the t is the pulse width, and the DT is the pulse width modulation response time.

According to some embodiments of the present invention, the primary side full-bridge circuit includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, and the first switch tube and the third switch tube operate In the complementary pulse width modulation mode, the closing time of the first switching tube and the opening time of the third switching tube are separated by the pulse width modulation response time; the second switching tube and the fourth switching tube operate in In the complementary pulse width modulation mode, the closing time of the second switching tube and the opening time of the fourth switching tube are separated by the pulse width modulation response time.

According to the control device of the resonant circuit according to the second embodiment of the present invention, the resonant circuit includes a primary-side full-bridge circuit, the control device includes a controller, and the controller is electrically connected to the primary-side full-bridge circuit, in:

The controller is used to obtain the pulse width modulation response time, control the operation of the primary-side full-bridge circuit according to the pulse width modulation response time, and each time an interrupt control signal is detected, control the operation of the primary-side full-bridge circuit according to a preset threshold. The pulse width modulation response time is cumulatively reduced, and the operation of the primary side full-bridge circuit is controlled according to the cumulatively reduced pulse width modulation response time.

Since the control device of the resonant circuit adopts all the technical solutions of the control method of the resonant circuit of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments.

An energy storage device according to a third embodiment of the present invention includes the control device as described in the above-mentioned second embodiment. Since the energy storage equipment adopts all the technical solutions of the control devices of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments.

According to the computer-readable storage medium according to the fourth embodiment of the present invention, computer-executable instructions are stored therein, and the computer-executable instructions are used to execute the control method of the resonant circuit as described in the above-mentioned first embodiment. Since the computer-readable storage medium adopts all the technical solutions of the resonant circuit control method of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

Figure 1 is a flow chart of a method for controlling a resonant circuit according to an embodiment of the present invention;

Figure 2 is a flow chart for controlling the operation of the primary-side full-bridge circuit based on the pulse width modulation response time according to an embodiment of the present invention;

Figure 3 is a flow chart for controlling the operation of the primary-side full-bridge circuit based on the cumulative pulse width modulation response time according to an embodiment of the present invention;

Figure 4 is a flow chart for adjusting the operating duty cycle according to the cumulative pulse width modulation response time according to an embodiment of the present invention;

Figure 5 is a flow chart of an embodiment of the present invention in which the adjusted operating duty cycle reaches a preset duty cycle threshold;

Figure 6 is a schematic diagram of a full-bridge LLC circuit according to an embodiment of the present invention;

Figure 7 is a schematic diagram of the calculation of operating duty cycle according to an embodiment of the present invention; and

FIG. 8 is a flowchart of a control method of a resonant circuit according to another embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and cannot be understood as limiting the present invention.

In the description of the present invention, if the first, second, etc. are described, they are only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implying Indicate the sequence relationship of the indicated technical features.

In the description of the present invention, it should be understood that the orientation descriptions involved, such as the orientation or positional relationship indicated by up, down, etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. , rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

In the description of the present invention, it should be noted that, unless otherwise clearly defined, words such as setting, installation, and connection should be understood in a broad sense. Those skilled in the art can reasonably determine the use of the above words in the present invention in combination with the specific content of the technical solution. specific meaning.

The traditional application scenarios based on fixed duty cycle output are limited, and if there are large capacitors at both ends of the circuit, a large current will flow through the switch tube when charging and discharging is started, causing burnout. Soft start can be achieved based on the full-bridge phase-shifting method, but the configuration is complex and requires a lot of chip resources.

Based on this, the control method of the resonant circuit provided by the embodiment of the present invention is suitable for realizing full-bridge LLC soft start without adding additional chip resources, effectively protecting the switch tube, enhancing reliability, and expanding application scenarios.

The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some, but not all, of the embodiments of the present invention.

Referring to Figure 1, there is a flow chart of a control method for a resonant circuit provided by an embodiment of the present invention. The control method includes but is not limited to the following steps:

Step S100, obtain the pulse width modulation response time;

Step S200, control the operation of the primary-side full-bridge circuit according to the pulse width modulation response time;

Step S300, when each interrupt control signal is detected, the pulse width modulation response time is cumulatively reduced according to the preset threshold;

Step S400: Control the operation of the primary-side full-bridge circuit according to the reduced pulse width modulation response time.

It should be noted that since power devices such as IGBTs have a certain junction capacitance, it will cause a delay in turning on and off the device. Generally, this effect has been reduced as much as possible when designing the circuit, such as increasing the control electrode drive voltage and current as much as possible, setting up a junction capacitance release loop, etc. In order to make the IGBT work reliably and avoid the upper and lower bridge arm cut-through due to the turn-off delay effect, it is necessary to set the pulse width modulation response time, which is the simultaneous turn-off time of the upper and lower bridge arms. The pulse width modulation response time can effectively avoid the delay effect caused by one bridge arm not being completely turned off while the other bridge arm is in a conductive state, thus preventing the module from being blown through. Pulse width modulation has a long response time and the module works more reliably, but it will cause distortion of the output waveform and reduce output efficiency. The pulse width modulation response time is small and the output waveform is better, but it will reduce reliability. Therefore, a better setting for setting the pulse width modulation response time is: on the premise of ensuring safety, the smaller the better.

Referring to Figure 2, a flow chart is shown for controlling the operation of the primary-side full-bridge circuit according to the pulse width modulation response time according to an embodiment of the present invention. Step S200 controls the operation of the primary-side full-bridge circuit according to the pulse width modulation response time, including but not limited to Following steps:

Step S201, calculate the operating duty cycle of the primary full-bridge circuit based on the pulse width modulation response time;

Step S202: Control the operation of the primary full-bridge circuit according to the operating duty cycle.

It should be noted that the pulse width modulation response time can be set independently. In order to achieve the purpose of soft start, on the premise that the switching period remains unchanged, by increasing/decreasing the pulse width modulation response time, the turn-on time of the two complementary tubes can be compressed/increased, thereby changing the operating duty cycle. In this embodiment, The initial pulse width modulation response time is generally set to a larger pulse width modulation response time, but smaller than the switching period of the switch tube. This embodiment does not place any specific limit on the specific value of the initial pulse width modulation response time.

Referring to Figure 3, it is a flow chart for controlling the operation of the primary-side full-bridge circuit based on the accumulated pulse width modulation response time according to an embodiment of the present invention. Step S400 controls the primary-side full-bridge circuit based on the accumulated reduced pulse width modulation response time. Bridge circuit operation includes but is not limited to the following steps:

Step S410, adjust the operating duty cycle according to the reduced pulse width modulation response time;

Step S420: Control the operation of the primary full-bridge circuit according to the adjusted operating duty cycle.

It should be noted that every time an interrupt control signal is detected, the pulse width modulation response time is reduced by a preset value, and the operating duty cycle of the switching tube can gradually increase from the initial pulse width modulation response time, thereby achieving The frequency of soft start and interrupt signals is determined by different scene tasks, and is not specifically limited in this embodiment.

This embodiment adjusts the operating duty cycle based on the reduced pulse width modulation response time. It is different from the full-bridge phase shifting method and does not require complex configuration and more chip resources. The primary side is controlled based on the adjusted operating duty cycle. When the full-bridge circuit is running, the output can be gradually increased from a small duty cycle to a large duty cycle to achieve soft start.

Referring to Figure 4, a flow chart is shown for adjusting the operating duty cycle according to the cumulative pulse width modulation response time according to an embodiment of the present invention. The primary side full bridge circuit operates in the complementary pulse width modulation mode according to the pulse width modulation response time. , step S420 adjusts the operating duty cycle according to the reduced pulse width modulation response time, including but not limited to the following steps:

Step S421, suspend the complementary pulse width modulation mode;

Step S422, load the reduced pulse width modulation response time;

Step S423, restart the complementary pulse width modulation mode, so that the cumulative pulse width modulation response time adjusts the operating duty cycle.

It should be noted that the complementary pulse width modulation mode uses pulse width control technology. The pulse width control technology can extremely effectively suppress harmonics. It has obvious advantages in frequency and efficiency, which improves the technical performance and reliability of the inverter circuit. has been significantly improved. The input of an inverter composed of pulse width control technology is a fixed DC voltage, which can achieve both voltage regulation and frequency regulation in the same inverter through pulse width control technology. Since this kind of inverter has only one controllable power stage, it simplifies the structure of the main loop and control loop, so it is small in size, light in weight and high in reliability. And because it integrates voltage regulation and frequency regulation, the regulation speed is fast and the system has good dynamic response. In addition, the use of pulse width control technology not only provides better inverter output voltage and current waveforms, but also improves the power factor of the inverter to the AC grid. When adjusting the frequency, the amplitude of the DC voltage is not changed, but the duty cycle of the output voltage pulse is changed. The effect of frequency conversion and voltage conversion can also be achieved. This embodiment uses changing the duty cycle of the output voltage pulse to achieve Soft start purpose.

It can be understood that based on the actual driving waveform of the pulse width modulation response time adjustment process, it can be found that when adjusting the pulse width modulation response time, it is necessary to first suspend the complementary pulse width modulation mode, load the accumulated and reduced pulse width modulation response time, and then Restarting causes the reduced pulse width modulation response time to adjust the operating duty cycle.

When the pulse width modulation response time is cumulatively reduced each time, the reduced pulse width modulation response time needs to be loaded, and the complementary pulse width modulation mode will be suspended to ensure a stable output of the waveform and avoid the need to load the pulse width modulation response time at each pulse width modulation response time. When changing, the waveform output is abnormal; at the same time, after the cumulative pulse width modulation response time is loaded, the complementary pulse width modulation mode is restarted. There will be a stop time when the waveform changes before and after, which can facilitate monitoring of the changing trend of the waveform.

Referring to Figure 5, a flow chart is shown in which the adjusted operating duty cycle reaches the preset duty cycle threshold according to an embodiment of the present invention. Step S420 controls the operation of the primary side full-bridge circuit according to the adjusted operating duty cycle, and further Including but not limited to the following steps:

Step S430: When the adjusted operating duty cycle reaches the preset duty cycle threshold, the cumulative reduction of the pulse width modulation response time is stopped.

It should be noted that the application scenarios of the fixed operating duty cycle are limited. For the adjusted operating duty cycle, the duty cycle threshold needs to be set according to different application scenarios to prevent the duty cycle from being too small when charging and discharging is started, resulting in large The current passing through the switch tube causes the switch tube to burn out.

The preset duty cycle threshold expands the application scenarios, effectively protects the switching tube, and enhances reliability.

Referring to Figure 7, which is a schematic diagram of the calculation of the operating duty cycle according to an embodiment of the present invention, the operating duty cycle is calculated according to the following formula:

Among them, D is the operating duty cycle, t is the pulse width, and DT is the pulse width modulation response time.

It should be noted that to calculate the operating duty cycle, it is necessary to quantify the pulse width of a periodic signal or the duty cycle of a pulse width modulation signal in different scenarios. In some scenarios, it is necessary to measure non-periodic pulses, such as the measurement of capacitors. For the pulses in the discharge ignition circuit, there are no specific restrictions on how to obtain the parameters required to calculate the operating duty cycle.

The continuously decreasing pulse width modulation response time is obtained through the calculation method of this embodiment to obtain an ever-increasing operating duty cycle, and the ever-increasing operating duty cycle is used to achieve the purpose of soft start without adding any chip resources and realizing cost Low, it can not only avoid the problems of switch tube burnout and output short circuit, but also make the output waveform better.

Refer to Figure 6, which is a schematic diagram of a full-bridge LLC circuit according to an embodiment of the present invention. In this embodiment, the primary full-bridge circuit includes a first switch tube, a second switch tube, a third switch tube and a fourth switch. tube, the first switching tube and the third switching tube operate in the complementary pulse width modulation mode, the closing time of the first switching tube and the opening time of the third switching tube are separated by the pulse width modulation response time; the second switching tube and the fourth switching tube When operating in the complementary pulse width modulation mode, the closing time of the second switching tube and the opening time of the fourth switching tube are separated by the pulse width modulation response time.

It should be noted that the left part of the circuit is the LLC primary side circuit, which is an H-bridge structure, also called a full bridge, with 4 controllable switching tubes (MOS tubes, IGBTs); the right part is the LLC secondary side circuit, which is uncontrollable. Rectifier structure with 4 uncontrollable diodes. For full-bridge LLC control, the primary full-bridge circuit includes switch tube G1, switch G2, switch tube G3 and switch tube G4. Switch tube G1 and switch tube G3 operate in the complementary pulse width modulation mode. Switch tube G1 is turned off. The time is separated from the turn-on time of switch G3 by the pulse width modulation response time; switch G2 and switch G4 operate in the complementary pulse width modulation mode, and the closing time of switch G2 is separated from the turn-on time of switch G4 by the pulse width modulation response time.

Through the complementary pulse width modulation mode, the operating duty cycle can be further changed by adjusting the pulse width modulation response time without adding additional chip resources, which reduces a large amount of resource costs; and the operating duty cycle can be further changed by adjusting the pulse width modulation response time. The configuration is not high compared to the implementation, the implementation is not complicated, it can be applied to different scenarios on a large scale, and it is very practical.

After the above description, this embodiment is also explained using a specific example. As shown in Figure 8, the control method of the resonant circuit specifically includes the following steps:

The first step is to power on the chip (MCU) and enter the initial configuration. Initialization is mainly to configure the underlying functions, including setting the complementary pulse width modulation mode. For full-bridge LLC control, the primary full-bridge circuit includes switch tube G1, switch G2, switch tube G3 and switch tube G4. Switch tube G1 and switch tube G3 operate in the complementary pulse width modulation mode. Switch tube G1 is turned off. The time is separated from the turn-on time of switch G3 by the pulse width modulation response time; switch G2 and switch G4 operate in the complementary pulse width modulation mode, and the closing time of switch G2 is separated from the turn-on time of switch G4 by the pulse width modulation response time.

It should be pointed out in particular that diodes, as rectifier components, should be selected according to different rectification methods and load sizes. If the selection is improper, it may not work safely or even burn the diode, or overuse materials and cause waste. This embodiment does not specifically limit this.

The second step is to set a larger initial pulse width modulation response time when initializing the configuration. The initial pulse width modulation response time is smaller than the switching period.

Step 3: After the initialization ends S1, the program officially starts running; during the running of the program, every time an interrupt control signal is detected, the pulse width modulation response time of the complementary pulse width modulation mode is adjusted as follows:

Each time interrupt S2 is entered, the pulse width modulation response time is adjusted to reduce the preset value.

When adjusting the pulse width modulation response time, you need to pause the complementary pulse width modulation mode first, load the reduced pulse width modulation response time, and then restart to adjust the operating duty cycle with the reduced pulse width modulation response time.

Step 4: As the pulse width modulation response time decreases, the operating duty cycle of the primary full-bridge circuit gradually increases to achieve soft start; when the operating duty cycle reaches the duty cycle threshold, the interrupt adjustment is exited and entered. Stable operating mode.

Through the above control steps, first through the complementary pulse width modulation mode, there is no need to increase chip resources, ensuring low implementation cost; then by detecting the interrupt control signal, the pulse width modulation response time of the complementary pulse width modulation mode is adjusted during interruption, which can ensure that Soft start is achieved under the premise of effectively protecting the switching tube. Since the preset value can be adjusted, the application scenarios are also expanded; finally, the duty cycle threshold is set to ensure that the duty cycle will not be too small when charging and discharging are started. It causes a large current to pass through the switch tube and cause the switch tube to burn out, which enhances the reliability, and is related to the fixed dead time (the dead time of the M0S tube is determined in the early stage of design, under the worst conditions and in a wide range It can meet the requirement that two power tubes are not turned on at the same time and realize alternate turn-on of two MOS tubes). Compared with the method of this specific embodiment, the method of this specific embodiment can maintain the same threshold dead time under different loads, processes and other external conditions. , the application scenarios have also been expanded.

In addition, an embodiment of the present invention also provides a control device for a resonant circuit. The resonant circuit includes a primary full-bridge circuit. The control device includes a controller. The controller is electrically connected to the primary full-bridge circuit, wherein:

The controller is used to obtain the pulse width modulation response time, control the operation of the primary-side full-bridge circuit based on the pulse width modulation response time, and cumulatively decrease the pulse width modulation response time according to the preset threshold every time an interrupt control signal is detected. , and control the operation of the primary-side full-bridge circuit based on the reduced pulse width modulation response time.

The control device of the resonant circuit also includes: a memory, a controller, and a computer program stored in the memory and executable on the controller. The controller and memory can be connected via a bus or other means.

As a non-transitory computer-readable storage medium, memory can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory may include high-speed random access memory and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory may include memory located remotely relative to the controller, and the remote memory may be connected to the controller via a network. Examples of the above-mentioned networks include but are not limited to the Internet, intranets, local area networks, mobile communication networks and combinations thereof.

The non-transient software programs and instructions required to implement the control method of the resonant circuit control device of the above embodiment are stored in the memory. When executed by the controller, the control method of the resonant circuit in the above embodiment is executed. For example, the above The method steps S100 to S400 in Figure 1, the method steps S201 to S202 in Figure 2, the method steps S410 to S420 in Figure 3, the method steps S421 to S423 in Figure 4, and the method in Figure 5 are described Step S430.

The device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separate, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, an embodiment of the present invention also provides an energy storage device, including the control device as in the above embodiment. Since the energy storage equipment adopts all the technical solutions of the control devices of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments.

In addition, an embodiment of the present invention also provides a computer-readable storage medium that stores computer-executable instructions, and the computer-executable instructions are executed by a processor or controller, for example, by the above-mentioned Execution by a processor in the embodiment of the energy storage device can cause the above-mentioned processor to execute the control method of the resonant circuit in the above-mentioned embodiment, for example, execute the above-described method steps S100 to S400 in Figure 1 and the method in Figure 2 Steps S201 to S202, method steps S410 to S420 in FIG. 3 , method steps S421 to S423 in FIG. 4 , and method step S430 in FIG. 5 .

Those of ordinary skill in the art can understand that all or some steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit . Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As is known to those of ordinary skill in the art, the term computer storage media includes volatile and nonvolatile media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. removable, removable and non-removable media. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disk (DVD) or other optical disk storage, magnetic cassettes, tapes, disk storage or other magnetic storage devices, or may Any other medium used to store the desired information and that can be accessed by a computer. Additionally, it is known to those of ordinary skill in the art that communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media .

The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various modifications can be made without departing from the purpose of the present invention. Variety.

Claims

A control method for a resonant circuit, wherein the resonant circuit includes a primary full-bridge circuit, and the control method includes:

Get pulse width modulation response time;

Control the operation of the primary-side full-bridge circuit according to the pulse width modulation response time;

Each time an interrupt control signal is detected, the pulse width modulation response time is cumulatively reduced according to a preset threshold; and

The operation of the primary side full-bridge circuit is controlled according to the reduced pulse width modulation response time.
The control method of a resonant circuit according to claim 1, wherein the controlling the operation of the primary-side full-bridge circuit according to the pulse width modulation response time includes:

Calculate the operating duty cycle of the primary-side full-bridge circuit based on the pulse width modulation response time; and

The operation of the primary side full-bridge circuit is controlled according to the operation duty cycle.
The control method of a resonant circuit according to claim 2, wherein the controlling the operation of the primary full-bridge circuit according to the cumulative pulse width modulation response time includes:

Adjust the operating duty cycle according to the reduced pulse width modulation response time; and

Control the operation of the primary side full-bridge circuit according to the adjusted operating duty cycle.
The control method of a resonant circuit according to claim 3, wherein the primary side full bridge circuit operates in a complementary pulse width modulation mode according to the pulse width modulation response time; and

The adjusting the operating duty cycle according to the reduced pulse width modulation response time includes:

suspend operation of said complementary pulse width modulation mode;

Loading the pulse width modulation response time after cumulative reduction; and

The complementary pulse width modulation mode is restarted, so that the accumulated pulse width modulation response time adjusts the operating duty cycle.
The control method of the resonant circuit according to claim 3, wherein the controlling the operation of the primary full-bridge circuit according to the adjusted operating duty cycle further includes:

When the adjusted operating duty cycle reaches a preset duty cycle threshold, the cumulative reduction of the pulse width modulation response time is stopped.
The control method of a resonant circuit according to claim 2, wherein the operating duty cycle is calculated according to the following formula:

Wherein, the D is the operating duty cycle, the t is the pulse width, and the DT is the pulse width modulation response time.
The control method of a resonant circuit according to claim 1, wherein the primary side full-bridge circuit includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, and the first switch tube and The third switching tube operates in a complementary pulse width modulation mode, and the closing time of the first switching tube and the opening time of the third switching tube are separated by the pulse width modulation response time; the second switching tube and the opening time of the third switching tube are separated by the pulse width modulation response time; The fourth switching tube operates in a complementary pulse width modulation mode, and the closing time of the second switching tube and the opening time of the fourth switching tube are separated by the pulse width modulation response time.
A control device for a resonant circuit, wherein the resonant circuit includes a primary full-bridge circuit, the control device includes a controller, and the controller is electrically connected to the primary full-bridge circuit, wherein:

The controller is used to obtain the pulse width modulation response time, control the operation of the primary-side full-bridge circuit according to the pulse width modulation response time, and each time an interrupt control signal is detected, control the operation of the primary-side full-bridge circuit according to a preset threshold. The pulse width modulation response time is cumulatively reduced, and the operation of the primary side full-bridge circuit is controlled according to the cumulatively reduced pulse width modulation response time.
An energy storage device includes the control device as claimed in claim 8.
A computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to execute the control method of the resonant circuit according to any one of claims 1 to 7.