WO2024045363A1

WO2024045363A1 - Rectifier circuit control method and apparatus, and energy storage device

Info

Publication number: WO2024045363A1
Application number: PCT/CN2022/133694
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: 2022-11-23
Publication date: 2024-03-07
Also published as: CN117674246A

Abstract

Disclosed in the present invention are a rectifier circuit control method and apparatus, and an energy storage device. The rectifier circuit comprises a primary full-bridge circuit and a secondary full-bridge circuit. The control method comprises: acquiring first pulse width modulation response time and second pulse width modulation response time, wherein the first pulse width modulation response time is less than the second pulse width modulation response time; and controlling first on-time of the primary full-bridge circuit according to the first pulse width modulation response time, and controlling second on-time of the secondary full-bridge circuit according to the second pulse width modulation response time.

Description

Control method, device and energy storage equipment of rectifier circuit

Cross-references to related applications

This application claims priority to the Chinese patent application with application number 202211062123.9 and titled "Control method, device and energy storage equipment of rectifier circuit" submitted on August 31, 2022, the entire content of which is incorporated into this application by reference. .

Technical field

The present invention relates to the technical field related to energy storage converters, and in particular to a control method, device and energy storage equipment for a rectifier circuit.

Background technique

In household energy storage converters, LLC resonant circuits are often used for multi-level conversion. The LLC circuit is called a series-parallel resonant circuit, which is mainly divided into half-bridge resonance and full-bridge resonance. Full bridge means that the primary side of the circuit is an H bridge with 4 controllable switch tubes, while half bridge is only half of the H bridge and has only 2 controllable switch tubes. The secondary side of the circuit is divided into uncontrollable rectification and synchronous rectification. Synchronous rectification refers to replacing diodes with MOS tubes with built-in diodes. Diodes generally have a standard conduction voltage drop of 0.7V or 0.3V. As the current increases, the conduction voltage drop will also increase. The on-resistance of the MOS tube is milliohm level, and the on-voltage drop is equal to the current multiplied by the on-resistance, which is very small. Therefore, using synchronous rectification can reduce diode losses and improve power conversion efficiency.

However, in the current common technical solutions, due to the leakage inductance, coil resistance, actual losses, hysteresis losses, eddy current losses, etc. in the actual transformer, the primary and secondary currents will have a phase difference, causing the secondary current to lag the primary current. However, LLC switching frequency is generally high in most application scenarios, making it difficult to track current phase changes, making it difficult to implement synchronous rectification.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in some cases. To this end, the present invention proposes a control method for a rectifier circuit, which can effectively realize synchronous rectification and improve user experience.

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 the rectifier circuit.

According to the control method of the rectifier circuit according to the first embodiment of the present invention, the rectifier circuit includes a primary side full bridge circuit and a secondary side full bridge circuit. The control method includes:

Obtain a first pulse width modulation response time and a second pulse width modulation response time, wherein the first pulse width modulation response time is less than the second pulse width modulation response time;

The conduction time of the primary side full bridge circuit is controlled according to the first pulse width modulation response time, and the conduction time of the secondary side full bridge circuit is controlled according to the second pulse width modulation response time, so that the The turn-on time of the switch tube in the secondary full-bridge circuit is later than the turn-on time of the corresponding switch tube in the primary full-bridge circuit, and the turn-on time of the switch tube in the secondary full-bridge circuit is earlier than the original switch tube. The closing time of the corresponding switch tube in the side full-bridge circuit.

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

The control method of the full-bridge rectifier circuit of the embodiment is applicable to the full-bridge rectifier circuit, and obtains the first pulse width modulation response time that controls the conduction time of the primary-side full-bridge circuit, and obtains the second pulse-width modulation response time that controls the conduction time of the secondary-side full-bridge circuit. Pulse width modulation response time. The first pulse width modulation response time is shorter than the second pulse width response time, so that the turn-on time of the switch tube in the secondary full-bridge circuit is later than the turn-on time of the corresponding switch tube in the primary full-bridge circuit, and the secondary side The closing time of the switching tube in the full-bridge circuit is earlier than the closing time of the corresponding switching tube in the primary full-bridge circuit, thereby avoiding the phenomenon of tube explosion in the straight-through situation, effectively implementing synchronous rectification, and ensuring the safety of the rectifier circuit . The full-bridge rectifier circuit of this embodiment can effectively reduce losses and improve power conversion efficiency without increasing additional costs.

According to some embodiments of the present invention, the turn-on time of the switch tube in the secondary full-bridge circuit is later than the turn-on time of the corresponding switch tube in the primary full-bridge circuit, and the turn-on time of the switch tube in the secondary full-bridge circuit The closing time of the switching tube is earlier than the closing time of the corresponding switching tube in the primary side full-bridge circuit.

According to some embodiments of the present invention, the second pulse width modulation response time is obtained by the following steps:

Get the first preset time;

The first pulse width modulation response time and the first preset time are added to obtain the second pulse width modulation response time.

According to some embodiments of the present invention, the first conduction time is obtained by the following formula:

t1＝(T1-2*DT1)/2;

Wherein, the t1 is the first conduction time, the T1 is the switching period of the primary full-bridge circuit, and the DT1 is the first pulse width modulation response time.

According to some embodiments of the present invention, the second conduction time is obtained by the following formula:

t2＝(T2-2*DT2)/2;

Wherein, the t2 is the second conduction time, the T2 is the switching period of the secondary full-bridge circuit, and the DT2 is the second 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 first pulse width modulation response time; the second switching tube and the fourth switching tube are When operating in the complementary pulse width modulation mode, the closing time of the second switching transistor and the opening time of the fourth switching transistor are separated by the first pulse width modulation response time.

According to some embodiments of the present invention, the secondary full-bridge circuit includes a fifth switch tube, a sixth switch tube, a seventh switch tube, and an eighth switch tube, and the fifth switch tube and the seventh switch tube operate In the complementary pulse width modulation mode, the closing time of the fifth switching tube and the opening time of the seventh switching tube are separated by the second pulse width modulation response time; the sixth switching tube and the eighth switching tube are When operating in the complementary pulse width modulation mode, the closing time of the sixth switching transistor and the opening time of the eighth switching transistor are separated by the second pulse width modulation response time.

According to the control device according to the second embodiment of the present invention, the rectifier circuit includes a primary side full bridge circuit and a secondary side full bridge circuit, the control device includes a controller, and the controller is respectively connected to the primary side full bridge circuit. The circuit is electrically connected to the secondary full-bridge circuit, where:

The controller is used to obtain the first pulse width modulation response time and the second pulse width modulation response time, control the first conduction time of the primary side full bridge circuit according to the first pulse width modulation response time, and according to the The second pulse width modulation response time controls the second conduction time of the secondary full bridge circuit, wherein the first pulse width modulation response time is smaller than the second pulse width modulation response time.

Since the control device adopts all the technical solutions of the control method of the rectifier circuit in the above embodiment, the control device at least includes all the beneficial effects brought by the technical solutions in the above embodiment.

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, the energy storage equipment at least includes 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, and the computer-executable instructions are used to execute the control method of the rectifier circuit as described in the above-mentioned first embodiment. Since the computer-readable storage medium adopts all the technical solutions of the control method of the rectifier circuit in the above embodiments, it has at least all the beneficial effects brought by the technical solutions in 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 rectifier circuit control method according to an embodiment of the present invention;

Figure 2 is a rectifier circuit diagram according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the driving waveforms of the primary full-bridge circuit switch tube and the secondary full-bridge circuit switch tube according to an embodiment of the present invention.

Reference signs:

Primary side full bridge circuit 100, first switch tube 110, second switch tube 120, third switch tube 130, fourth switch tube 140,

The secondary full bridge circuit 200, the fifth switch tube 210, the sixth switch tube 220, the seventh switch tube 230, and the eighth switch tube 240.

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.

Based on the increasing user requirements for household energy storage converters (energy storage DC/DC), the most important functional element in energy storage converters is the LLC resonant circuit. LLC resonant circuits are often used for multi-level conversion. The LLC resonant circuit is called a series-parallel resonant circuit, which is mainly divided into half-bridge resonance and full-bridge resonance. Full bridge means that the primary side of the circuit is an H bridge with 4 controllable switch tubes. Half bridge is only half of the H bridge and has only 2 controllable switch tubes. The secondary side of the circuit is divided into uncontrollable rectification and synchronous rectification. Synchronous rectification refers to replacing diodes with MOS tubes with built-in diodes. Diodes generally have a standard conduction voltage drop of 0.7V or 0.3V. If the current increases, the conduction voltage drop will also increase. The on-resistance of the MOS tube is milliohm level, and the on-voltage drop is equal to the current multiplied by the on-resistance, which is very small. Therefore, using synchronous rectification can reduce diode losses and improve power conversion efficiency. There are currently two commonly used technical solutions. One takes into account the cost and uses diodes on the secondary side, which is an uncontrollable rectification; the other takes into account the needs of charging and discharging and uses a MOS tube on the secondary side, which is a controllable rectification. Corresponding to the first type, a diode is used on the secondary side, which is an uncontrollable rectifier. Diodes generally have a standard conduction voltage drop of 0.7V or 0.3V. As the current increases, the conduction voltage drop will also increase, so the conversion efficiency is low. Corresponding to the second type, the secondary side uses a MOS tube. Due to leakage inductance, coil resistance, actual losses, hysteresis losses, eddy current losses, etc. in actual transformers, there will be a phase difference in the primary and secondary currents, and the secondary current will lag behind the primary current. Therefore, if synchronous rectification is implemented, there needs to be a time difference between the opening and closing times of the corresponding switching tubes on the primary and secondary sides. That is, the switching tubes on the secondary side are turned on later than the corresponding switching tubes on the primary side and closed earlier than the corresponding switching tubes on the primary side. Otherwise, shoot-through will occur. Pipe explosion phenomenon. The LLC switching frequency is generally high (40, 50K or above) in most application scenarios, making it difficult to track current phase changes using conventional methods (such as Hall sensors), making it difficult to implement synchronous rectification. Therefore, the control method, control device and energy storage device of the rectifier circuit proposed in this embodiment emerge as the times require, and realize synchronous rectification control through differentiated settings of the primary and secondary switch transistors.

Figure 1 is a flow chart of a rectifier circuit control method according to an embodiment of the present invention; the rectifier circuit includes a primary full-bridge circuit 100 and a secondary full-bridge circuit 200. The control method includes:

Obtaining a first pulse width modulation response time and a second pulse width modulation response time, wherein the first pulse width modulation response time is less than the second pulse width modulation response time;

The first conduction time of the primary side full bridge circuit 100 is controlled according to the first pulse width modulation response time, and the second conduction time of the secondary side full bridge circuit 200 is controlled according to the second pulse width modulation response time.

The rectifier circuit includes a primary-side full-bridge circuit 100 and a secondary-side full-bridge circuit 200. There will be a phase difference in the primary-side and secondary-side currents of the transformer, and the secondary-side current will lag behind the primary-side current. From this, it can be seen that the switch tube on the primary side is larger than the corresponding switch tube on the secondary side. The switch tube is turned on in advance. After the first group of primary-side switches in the full-bridge circuit is turned off, in order to prevent the other group of switches from being turned on, the corresponding first group of secondary-side switches are not turned off at this time, and current will accumulate in the opposite direction, causing an abnormality. Phenomenon. Therefore, the secondary switch tube is turned off earlier than the corresponding switch tube on the primary side. Corresponding to the control method, the obtained first pulse width modulation response time is smaller than the obtained second pulse width modulation response time to ensure that synchronous rectification is achieved. And it effectively avoids the phenomenon of direct pipe explosion and effectively ensures the safety of the rectifier circuit. The full-bridge rectifier circuit of this embodiment can effectively reduce losses and improve power conversion efficiency without increasing additional costs.

The control method of the full-bridge rectifier circuit of the embodiment is applicable to the full-bridge rectifier circuit, obtaining the first pulse width modulation response time that controls the conduction time of the primary-side full-bridge circuit 100, and obtaining the first pulse width modulation response time that controls the conduction time of the secondary-side full-bridge circuit 200. Second pulse width modulation response time. The first pulse width modulation response time is less than the second pulse width response time, so that the turn-on time of the switch tube in the secondary full-bridge circuit 200 is later than the turn-on time of the corresponding switch tube in the primary-side full bridge circuit 100, and The closing time of the switching tube in the secondary full-bridge circuit 200 is earlier than the closing time of the corresponding switching tube in the primary full-bridge circuit 100, thereby avoiding the phenomenon of direct tube explosion, effectively implementing synchronous rectification, and ensuring the safety of the rectification circuit. The full-bridge rectifier circuit of this embodiment can effectively reduce losses and improve power conversion efficiency without increasing additional costs.

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, Figure 1 is a flow chart of a rectifier circuit control method provided by one embodiment of the present invention. The control method of the rectifier circuit includes but is not limited to the following steps:

Step S100, obtain the first pulse width modulation response time and the second pulse width modulation response time, wherein the first pulse width modulation response time is less than the second pulse width modulation response time;

It should be noted that the first pulse width modulation response time corresponds to the dead time of the waveform of the complementary switch tube in the primary side switch tube of the full-bridge rectifier circuit, and the second pulse width modulation response time corresponds to the secondary-side switch tube of the full-bridge rectifier circuit. The dead time of the complementary switching tube waveform in .

Step S200: Control the first conduction time of the primary full-bridge circuit 100 according to the first pulse width modulation response time, and control the second conduction time of the secondary full-bridge circuit 200 according to the second pulse width modulation response time.

It should be noted that since the switching period of the primary and secondary switching tubes is a certain value, the primary-side full-bridge circuit 100 can be determined accordingly by setting the first pulse width modulation response time and the second pulse-width modulation response time. The first conduction time and the second conduction time of the secondary full bridge circuit 200. After determining the first conduction time of the primary side full bridge circuit 100 and the second conduction time of the secondary side full bridge circuit 200, the first duty cycle and the secondary side full bridge circuit 100 can be calculated correspondingly. The second duty cycle of the bridge circuit 200 can thereby better realize synchronous control of the switching tubes in the primary full bridge circuit 100 and the secondary full bridge circuit 200, effectively improve the control efficiency, and achieve synchronous rectification.

Referring to Figure 3, in some embodiments of the present invention, the turn-on time of the switch tube in the secondary full-bridge circuit 200 is later than the turn-on time of the corresponding switch tube in the primary full-bridge circuit 100, and the secondary full-bridge The turn-off time of the switch in the circuit 200 is earlier than the turn-off time of the corresponding switch in the primary full-bridge circuit 100 . Since the actual transformer has leakage inductance, coil resistance, actual losses, hysteresis losses, eddy current losses, etc., the primary and secondary currents will have a phase difference, so the switching tube in the secondary full-bridge circuit 200 needs to be controlled later than the primary full-bridge circuit. The corresponding switch tube in 100 is turned on, and the switch tube in the secondary full-bridge circuit 200 is turned off earlier than the corresponding switch tube in the primary-side full bridge circuit 100 to ensure synchronous rectification on the basis of safety.

In some embodiments of the present invention, the second pulse width modulation response time is obtained by the following steps:

Get the first preset time;

The first preset time is a time value set by the controller for time differentiation of the rectifier circuit. The first preset time is a positive number. The second pulse width modulation response time is determined by the first pulse width modulation response time and the first preset time. It is obtained by adding up, thus ensuring that the original and secondary switch tubes are turned on and off at the corresponding time point.

In some embodiments of the invention, the first on-time is obtained by the following formula:

t1＝(T1-2*DT1)/2;

Wherein, t1 is the first conduction time, T1 is the switching period of the primary full-bridge circuit 100, and DT1 is the first pulse width modulation response time.

The first conduction time t1 is the conduction time of the primary switch transistor. Its calculation formula is as shown above. It is determined by the switching period of the primary full bridge circuit 100 and the first pulse width modulation response time. According to the first conduction time t1 The first duty cycle D1 of the primary switching tube can also be determined. The calculation formula of the first duty cycle D1 is:

D1=t1/T;

Therefore, the opening and closing time of the primary switching tube can be reasonably determined based on the first duty cycle D1 of the primary switching tube.

In some embodiments of the invention, the second conduction time is obtained by the following formula:

t2＝(T2-2*DT2)/2;

Wherein, t2 is the second conduction time, T2 is the switching period of the secondary full-bridge circuit 200, and DT2 is the second pulse width modulation response time.

The second conduction time t2 is the conduction time of the secondary switch transistor. Its calculation formula is as shown above. It is determined by the switching period of the secondary full bridge circuit 200 and the second pulse width modulation response time. According to the second conduction time t2 The second duty cycle D2 of the secondary side switch tube can also be determined. The calculation formula of the second duty cycle D2 is:

D1=t1/T;

Therefore, the turn-on and turn-off time of the secondary switch can be reasonably determined based on the second duty cycle D2 of the secondary switch.

Referring to Figures 2 and 3, in some embodiments of the present invention, the primary full-bridge circuit 100 includes a first switching tube 110, a second switching tube 120, a third switching tube 130 and a fourth switching tube 140. The first switching tube 110 and the third switching tube 130 operate in the complementary pulse width modulation mode. The closing time of the first switching tube 110 and the opening time of the third switching tube 130 are separated by the first pulse width modulation response time; the second switching tube 120 and The fourth switching transistor 140 operates in the complementary pulse width modulation mode, and the closing time of the second switching transistor 120 and the opening time of the fourth switching transistor 140 are separated by the first pulse width modulation response time.

Referring to Figure 2, the first switch tube 110 is the switch tube G1, the second switch tube 120 is the switch tube G2, the third switch tube 130 is the switch tube G3, and the fourth switch tube 140 is the switch tube G4. For a full-bridge rectifier circuit, the primary switching transistor first switching transistor 110 and the third switching transistor 130 are in a complementary relationship, and the second switching transistor 120 and the fourth switching transistor 140 are also in a complementary relationship. As shown in Figure 3, the closing time of the first switching transistor 110 and the opening time of the third switching transistor 130 are separated by the first pulse width modulation response time DT1. The same applies to the second switching transistor 120 and the fourth switching transistor 140. The two switches The turn-on time of the tube is also separated from the first pulse width modulation response time DT1.

Referring to FIGS. 2 and 3 , in some embodiments of the present invention, the secondary full-bridge circuit 200 includes a fifth switch 210 , a sixth switch 220 , a seventh switch 230 and an eighth switch 240 . The fifth switching tube 210 and the seventh switching tube 230 operate in the complementary pulse width modulation mode. The closing time of the fifth switching tube 210 and the opening time of the seventh switching tube 230 are separated by the second pulse width modulation response time; the sixth switching tube 220 and The eighth switching transistor 240 operates in the complementary pulse width modulation mode, and the closing time of the sixth switching transistor 220 and the opening time of the eighth switching transistor 240 are separated by the second pulse width modulation response time.

Referring to Figure 2, the fifth switch tube 210 is the switch tube M1, the sixth switch tube 220 is the switch tube M2, the seventh switch tube 230 is the switch tube M3, and the eighth switch tube 240 is the switch tube M4. The fifth switch transistor 210 and the seventh switch transistor 230 in the secondary side switch transistor are in a complementary relationship, and the sixth switch transistor 220 and the eighth switch transistor 240 are in a complementary relationship. As shown in Figure 3, the closing time of the fifth switching transistor 210 and the opening time of the seventh switching transistor 230 are separated by the second pulse width modulation response time DT2. The sixth switching transistor 220 and the eighth switching transistor 240 are the same. The two switches The turn-on time of the tube is also separated by the second pulse width modulation response time DT2.

In order to better understand the control method of the rectifier circuit in this embodiment, the working process of synchronous rectification of the entire rectifier circuit is described here:

The controller is powered on and enters initial configuration. The initial configuration is mainly to configure the underlying functions of the controller, mainly including setting the complementary PWM mode. For a full-bridge rectifier circuit, the first switch tube 110 and the third switch tube 130 in the primary switch tube have a complementary relationship, that is, only one of the first switch tube 110 and the third switch tube 130 can be turned on at the same time. The second switch transistor 120 and the fourth switch transistor 140 are also in a complementary relationship. Similarly, the fifth switch transistor 210 and the seventh switch transistor 230 in the corresponding secondary side switch transistors are in a complementary relationship. At the same time, the fifth switch transistor 210 and the seventh switch transistor 230 are in a complementary relationship. Only one of the seventh switching tubes 230 can be turned on. The sixth switching transistor 220 and the eighth switching transistor 240 have a complementary relationship and have the same working principle, which will not be described again here. The complementary PWM mode set by the controller can achieve the above working effects.

It should be noted that when configuring the complementary PWM mode, due to the leakage inductance, coil resistance, actual losses, hysteresis losses, eddy current losses, etc. in the actual transformer, there will be a phase difference in the primary and secondary currents, and the secondary current will lag behind the primary current. , so if synchronous rectification is implemented, there will be a time difference between the opening and closing times of the switching tubes corresponding to the primary and secondary sides, so that the switching tubes on the secondary side are turned on later than the corresponding switching tubes on the primary side and closed earlier than the corresponding switching tubes on the primary side. However, the usual control method cannot track the current phase changes, so it cannot achieve precise control, and it is difficult to implement synchronous rectification. Therefore, in this embodiment, the driving signals for driving the primary and secondary switch transistors are set separately, that is, the first pulse width modulation response time of the primary side and the second pulse width modulation response time of the secondary side need to be set differentially. The first pulse width modulation response time DT1 is shorter than the second pulse width modulation response time DT2, DT2=DT1+a, a is the time preset by the controller. After the initial configuration is completed, the driving signal is started to complete synchronous rectification.

In addition, an embodiment of the present invention also provides a control device. The rectifier circuit includes a primary full-bridge circuit 100 and a secondary full-bridge circuit 200. The control device includes a controller, and the controller is respectively connected to the primary full-bridge circuit 100 and the secondary full-bridge circuit 200. The secondary full bridge circuit 200 is electrically connected, among which:

The controller is used to obtain the first pulse width modulation response time and the second pulse width modulation response time, control the first conduction time of the primary side full bridge circuit 100 according to the first pulse width modulation response time, and according to the second pulse width modulation response time The second conduction time of the secondary full-bridge circuit 200 is time controlled, wherein the first pulse width modulation response time is smaller than the second pulse width modulation response time.

The control device includes a controller and the above-mentioned full-bridge rectifier circuit in this embodiment. The control method of the full-bridge rectifier circuit in the embodiment is suitable for the full-bridge rectifier circuit to obtain the first pulse width that controls the conduction time of the primary full-bridge circuit. modulation response time, and obtain the second pulse width modulation response time that controls the conduction time of the secondary full-bridge circuit. The first pulse width modulation response time is shorter than the second pulse width response time, so that the turn-on time of the switch tube in the secondary full-bridge circuit is later than the turn-on time of the corresponding switch tube in the primary full-bridge circuit, and the secondary side The closing time of the switching tube in the full-bridge circuit is earlier than the closing time of the corresponding switching tube in the primary full-bridge circuit, thereby avoiding the phenomenon of direct tube explosion, effectively implementing synchronous rectification, and ensuring the safety of the rectifier circuit. The full-bridge rectifier circuit of this embodiment can effectively reduce losses and improve power conversion efficiency without increasing additional costs.

It should be noted that since the control device needs to obtain and control the first pulse width modulation response time of the primary side full bridge circuit conduction time and the second pulse width modulation response time of the secondary side full bridge circuit conduction time, and the third The second pulse width modulation response time is obtained by adding the first pulse width modulation response time and the first preset time pre-stored in the memory of the control device. Therefore, the control device also includes a memory, a processor and a device stored in the memory. A computer program that runs on a processor. The processor and memory may 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 from the processor, and the remote memory may be connected to the processor through 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 energy storage device control method in the above embodiment are stored in the memory. When executed by the processor, the energy storage device control method in the above embodiment is executed. For example, the above described Method steps S100 to S200 in Figure 1 .

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 device adopts all the technical solutions of the control device of the above embodiment, the energy storage device at least includes the control method of the full-bridge rectifier circuit of the embodiment, which is suitable for the full-bridge rectifier circuit to obtain the control of the primary-side full-bridge circuit conduction time. The first pulse width modulation response time, and the second pulse width modulation response time that controls the conduction time of the secondary full bridge circuit are obtained. The first pulse width modulation response time is shorter than the second pulse width response time, so that the turn-on time of the switch tube in the secondary full-bridge circuit is later than the turn-on time of the corresponding switch tube in the primary full-bridge circuit, and the secondary side The closing time of the switching tube in the full-bridge circuit is earlier than the closing time of the corresponding switching tube in the primary full-bridge circuit, thereby avoiding the phenomenon of direct tube explosion, effectively implementing synchronous rectification, and ensuring the safety of the rectifier circuit. The full-bridge rectifier circuit of this embodiment can effectively reduce losses and improve power conversion efficiency without increasing additional costs.

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 may cause the processor to execute the control method of the rectifier circuit in the above embodiment, for example, execute the above-described method steps S100 to S200 in FIG. 1 .

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 rectifier circuit, wherein the rectifier circuit includes a primary full-bridge circuit and a secondary full-bridge circuit, and the control method includes:

Obtaining a first pulse width modulation response time and a second pulse width modulation response time, wherein the first pulse width modulation response time is less than the second pulse width modulation response time;

The first conduction time of the primary side full bridge circuit is controlled according to the first pulse width modulation response time, and the second conduction time of the secondary side full bridge circuit is controlled according to the second pulse width modulation response time. .
The control method of the rectifier circuit according to claim 1, wherein the turn-on time of the switch tube in the secondary full-bridge circuit is later than the turn-on time of the corresponding switch tube in the primary full-bridge circuit, and the The closing time of the switching tube in the secondary full-bridge circuit is earlier than the closing time of the corresponding switching tube in the primary full-bridge circuit.
The control method of a rectifier circuit according to claim 1, wherein the second pulse width modulation response time is obtained by the following steps:

Get the first preset time;

The first pulse width modulation response time and the first preset time are added to obtain the second pulse width modulation response time.
The control method of the rectifier circuit according to claim 1, wherein the first conduction time is obtained by the following formula:

t1＝(T1-2*DT1)/2;

Wherein, the t1 is the first conduction time, the T1 is the switching period of the primary full-bridge circuit, and the DT1 is the first pulse width modulation response time.
The control method of the rectifier circuit according to claim 1, wherein the second conduction time is obtained by the following formula:

t2＝(T2-2*DT2)/2;

Wherein, the t2 is the second conduction time, the T2 is the switching period of the secondary full-bridge circuit, and the DT2 is the second pulse width modulation response time.
The control method of the rectifier 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 first pulse width modulation response time; the second switching tube The fourth switching transistor operates in the complementary pulse width modulation mode, and the closing time of the second switching transistor and the opening time of the fourth switching transistor are separated by the first pulse width modulation response time.
The control method of the rectifier circuit according to claim 1, wherein the secondary full-bridge circuit includes a fifth switch tube, a sixth switch tube, a seventh switch tube and an eighth switch tube, and the fifth switch tube and The seventh switching tube operates in a complementary pulse width modulation mode, and the closing time of the fifth switching tube and the opening time of the seventh switching tube are separated by the second pulse width modulation response time; the sixth switching tube The eighth switching transistor operates in the complementary pulse width modulation mode, and the closing time of the sixth switching transistor and the opening time of the eighth switching transistor are separated by the second pulse width modulation response time.
A control device for a rectifier circuit, wherein the rectifier circuit includes a primary full-bridge circuit and a secondary full-bridge circuit, the control device includes a controller, and the controller is respectively connected to the primary full-bridge circuit and the secondary full-bridge circuit. Describe the electrical connections of the secondary full-bridge circuit, where:

The controller is used to obtain the first pulse width modulation response time and the second pulse width modulation response time, control the first conduction time of the primary side full bridge circuit according to the first pulse width modulation response time, and according to the The second pulse width modulation response time controls the second conduction time of the secondary full bridge circuit, wherein the first pulse width modulation response time is smaller than the second 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 rectifier circuit according to any one of claims 1 to 7.