CN114268213A - Soft switching circuit based on LLC circuit, control method and control device - Google Patents
Soft switching circuit based on LLC circuit, control method and control device Download PDFInfo
- Publication number
- CN114268213A CN114268213A CN202210189667.5A CN202210189667A CN114268213A CN 114268213 A CN114268213 A CN 114268213A CN 202210189667 A CN202210189667 A CN 202210189667A CN 114268213 A CN114268213 A CN 114268213A
- Authority
- CN
- China
- Prior art keywords
- circuit
- llc
- trigger
- trigger voltages
- controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a soft switching circuit, a control method and a control device based on an LLC circuit. The circuit comprises a primary side, a transformer, a secondary side and a controller; the primary side is a full-bridge circuit and comprises a direct-current input source, a first bridge arm switching tube consisting of Q2A and Q2B, a second bridge arm switching tube consisting of Q3A and Q3B, and an LLC resonance tank consisting of a resonance capacitor, a resonance inductor and an excitation inductor; a center tap is arranged in the transformer; the secondary side is a rectifying circuit consisting of Q4A, Q5A and an output filter capacitor; Q2A, Q2B, Q3A, Q3B, Q4A, Q5A are MOSFETs; the controller is used for acquiring a voltage interval of the LLC circuit; when the LLC circuit is operating in reverse and the primary side is in a Boost interval, the controller is further configured to send trigger voltages to Q2B, Q3A, Q4A, and Q5A, wherein the controller sends trigger voltages to Q2B and Q3A ahead of sending trigger voltages to Q4A and Q5A, respectively. In this way, EMI noise may be reduced, further improving the reverse operation performance of conventional LLC.
Description
Technical Field
The present disclosure relates to the field of power electronic converter technology, and more particularly, to the field of soft switching implementation based on LLC circuits.
Background
The traditional LLC circuit can realize soft switching of a switching tube while carrying out wide-range voltage regulation, thereby being widely applied to occasions with higher requirements on efficiency.
However, when the LLC circuit is in Boost mode, if the primary side switching tube and the secondary side switching tube are turned on at the same time, the secondary side switching tube is in hard switching at this time, the switching loss is large, and at the same time, the hard switching causes large noise, which is likely to cause interference, and has high requirements for the EMI filtering design of the converter as a whole.
Disclosure of Invention
The disclosure provides a soft switching circuit, a control method and a control device based on an LLC circuit.
According to a first aspect of the present disclosure, a soft switching circuit based on an LLC circuit is provided, including a primary side, a transformer, a secondary side, and a controller; the primary side is a full bridge circuit and comprises a direct current input source, a first bridge arm switching tube consisting of Q2A and Q2B and a second bridge arm switching tube consisting of Q3A and Q3B, wherein Q2A, Q2B, Q3A and Q3B are MOSFETs, diodes D2A, D2B, D3A and D3B are respectively connected in parallel between the source and drain electrodes of Q2A, Q2B, Q3A and Q3B, and an LLC resonance tank consisting of a resonance capacitor, a resonance inductor and an excitation inductor; a center tap is arranged in the transformer; the secondary side is a rectifying circuit consisting of Q4A, Q5A, D4A, D5A and an output filter capacitor, Q4A and Q5A are also MOSFETs, and diodes D4A and D5A are respectively connected in parallel between the source and drain electrodes of Q4A and Q5A; the controller is used for acquiring a voltage interval of the LLC circuit; when the LLC circuit is operating in reverse and the primary side is in a Boost interval, the controller is further configured to send trigger voltages to Q2B, Q3A, Q4A, and Q5A, wherein the controller sends trigger voltages to Q2B and Q3A ahead of sending trigger voltages to Q4A and Q5A, respectively.
In some implementations of the first aspect, the controller is further to send the trigger voltage to Q4A and Q5A at a fifty percent duty cycle and in a complementary manner to the dead band.
In some implementations of the first aspect, the trigger voltages sent to Q2B and Q3A are determined according to the load and a preset reverse gain, and if the reverse gain is larger and the load is heavier, the sending time duration of the trigger voltages sent to Q2B and Q3A is longer, so that the on-time of Q2B and Q3A is longer.
According to a second aspect of the present disclosure, there is provided a control method for a soft switching circuit in some implementations based on the first aspect and the first aspect, the control method including:
acquiring a voltage interval of the LLC circuit;
when the LLC circuit is operating in reverse and the primary side is in a Boost interval, trigger voltages are sent to Q2B, Q3A, Q4A, and Q5A, where sending trigger voltages to Q2B and Q3A is earlier than sending trigger voltages to Q4A and Q5A, respectively.
In some implementations of the second aspect, sending the trigger voltage to Q4A and Q5A includes:
the trigger voltages are sent to Q4A and Q5A in a fifty percent duty cycle and dead band complementary fashion.
In some implementations of the second aspect, the trigger voltage transmitted to Q2B and Q3A is determined according to the load and a preset reverse gain, and if the reverse gain is larger and the load is heavier, the transmission time length of the trigger voltage transmitted to Q2B and Q3A is longer, so that the on-time of Q2B and Q3A is longer.
According to a third aspect of the present disclosure, there is provided a control apparatus based on the first aspect and the soft switching circuit in some implementations of the first aspect, the control apparatus including:
the acquisition module is used for acquiring a voltage interval of the LLC circuit;
and the trigger voltage sending module is used for sending trigger voltages to Q2B, Q3A, Q4A and Q5A when the LLC circuit runs in the reverse direction and the primary side is in a Boost interval, wherein the trigger voltages sent to Q2B and Q3A are respectively earlier than the trigger voltages sent to Q4A and Q5A.
In some implementations of the third aspect, the trigger voltage sending module is further configured to send the trigger voltages to Q4A and Q5A at a fifty percent duty cycle and in a complementary manner to the dead band.
According to a fourth aspect of the present disclosure, an electronic device is provided. The electronic device includes: a memory having a computer program stored thereon and a processor that, when executing the program, implements a control method as described above in the second aspect, as well as in some implementations of the second aspect.
According to a fifth aspect of the present disclosure, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the second aspect as described above, and the control method in some implementations of the second aspect.
According to a sixth aspect of the present disclosure, there is provided a computer program product comprising a computer program which, when executed by a processor, implements the second aspect as described above, and the control method in some implementations of the second aspect.
According to the soft switching circuit based on the LLC circuit, the control method and the control device, when the LLC circuit runs in the reverse direction and the primary side is in a Boost interval, the controller sends trigger voltages to Q2B, Q3A, Q4A and Q5A, wherein the trigger voltages sent by the controller to Q2B and Q3A are respectively earlier than the trigger voltages sent to Q4A and Q5A. According to the invention, on the basis of not changing the traditional LLC circuit structure, a Boost operation mode is utilized, on the basis of realizing reverse wide-range voltage regulation, soft switching of a secondary side switching tube is realized by changing the switching-on time of a primary side switching tube, the switching loss of devices is reduced, the working efficiency of reverse operation is improved, EMI noise is reduced, and the reverse operation performance of the traditional LLC is further improved.
It should be understood that the statements herein reciting aspects are not intended to limit the critical or essential features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
The above and other features, advantages and aspects of various embodiments of the present disclosure will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. The accompanying drawings are included to provide a further understanding of the present disclosure, and are not intended to limit the disclosure thereto, and the same or similar reference numerals will be used to indicate the same or similar elements, where:
fig. 1 shows a schematic structural diagram of a soft switching circuit based on an LLC circuit according to an embodiment of the present disclosure;
FIG. 2 illustrates a schematic diagram of waveforms of drive/current etc. of a soft switching circuit in a reverse boost mode of operation in accordance with an embodiment of the present disclosure;
FIG. 3 shows a flow diagram of a control method of an embodiment of the present disclosure;
FIG. 4 shows a schematic structural diagram of a control device of an embodiment of the present disclosure;
FIG. 5 illustrates a block diagram of an exemplary electronic device capable of implementing embodiments of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
In addition, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The traditional LLC circuit can realize soft switching of a switching tube while carrying out wide-range voltage regulation, thereby being widely applied to occasions with higher requirements on efficiency.
However, when the LLC circuit is in Boost mode, if the primary side switching tube and the secondary side switching tube are turned on at the same time, the secondary side switching tube is in hard switching at this time, the switching loss is large, and at the same time, the hard switching causes large noise, which is likely to cause interference, and has high requirements for the EMI filtering design of the converter as a whole.
In order to solve the problem that the overall EMI filtering design requirement of a converter is high when an LLC circuit is in a Boost mode, the disclosure provides a soft switching circuit, a control method, a control device, electronic equipment and a computer readable storage medium based on the LLC circuit, and the voltage interval of the LLC circuit is obtained; when the LLC circuit is operating in reverse and the primary side is in a Boost interval, the controller sends trigger voltages to Q2B, Q3A, Q4A, and Q5A, where the controller sends trigger voltages to Q2B and Q3A ahead of the trigger voltages to Q4A and Q5A, respectively. According to the invention, on the basis of not changing the traditional LLC circuit structure, a Boost operation mode is utilized, on the basis of realizing reverse wide-range voltage regulation, soft switching of a secondary side switching tube is realized by changing the switching-on time of a primary side switching tube, the switching loss of devices is reduced, the working efficiency of reverse operation is improved, EMI noise is reduced, and the reverse operation performance of the traditional LLC is further improved.
The technical solutions provided by the embodiments of the present disclosure are described below with reference to the accompanying drawings.
As shown in fig. 1, the soft switching circuit based on the LLC circuit includes a primary side, a transformer, a secondary side, and a controller; the primary side is a full-bridge circuit and comprises a direct-current input source, a first bridge arm switching tube consisting of Q2A and Q2B and a second bridge arm switching tube consisting of Q3A and Q3B, wherein Q2A, Q2B, Q3A and Q3B are MOSFETs, diodes D2A, D2B, D3A and D3B are respectively connected between the source and drain electrodes of Q2A, Q2B, Q3A and Q3B in parallel, and an LLC resonance tank consisting of a resonance capacitor, a resonance inductor and an excitation inductor; a center tap is arranged in the transformer;
the secondary side is a rectifying circuit consisting of Q4A, Q5A, D4A, D5A and an output filter capacitor, Q4A and Q5A are also MOSFETs, and diodes D4A and D5A are respectively connected in parallel between the source and drain electrodes of Q4A and Q5A; the secondary side of the invention adopts a mode that one MOSFET transistor Q4A is connected with one diode D4A in parallel and one MOSFET transistor Q5A is connected with one diode D5A in parallel to form a rectifying circuit, thereby realizing the function of freewheeling. Specifically, in the conventional rectifier circuit, a full-bridge rectifier circuit is generally used, which is formed by connecting two diodes in series and then connecting another two diodes in series. Such a rectifier circuit cannot realize a freewheel function. In the present invention, if the MOSFET transistors Q4A and Q5A are turned off, current can still flow through the diodes D4A and D5A, thereby allowing freewheeling.
The controller is used for acquiring a voltage interval of the LLC circuit;
when the LLC circuit is operating in reverse and the primary side is in a Boost interval, the controller is further configured to send trigger voltages to Q2B, Q3A, Q4A, and Q5A, wherein the controller sends trigger voltages to Q2B and Q3A ahead of sending trigger voltages to Q4A and Q5A, respectively.
In one embodiment, the drains of Q2A and Q3B are connected with the positive pole of an input direct current source, the sources of Q2A and Q3B are connected with the drains of Q2B and Q3A, respectively, the sources of Q2B and Q3A are connected with the negative pole of the input direct current source, one end of a resonant inductor Lr is connected with the source of Q2A and the drain of Q2B, and the other end is connected with one end of an excitation inductor Lm and one end of a transformer T0One end of a resonant capacitor Cr is connected with the source electrode of Q3B and the drain electrode of Q3A, and the other end is connected with the other end of an excitation inductor Lm and a transformer T0And the gates of Q2A, Q2B, Q3A, and Q3B are also connected to the controller.
In one embodiment, the controller is further connected in parallel with the filter capacitor Co and the dc input source, respectively, for obtaining the voltage range of the LLC circuit.
In one embodiment, transformer T0One end of the secondary side of the transformer is connected with the drain electrode of the Q4A and the transformer T0The center tap on the secondary side of the transformer is connected with one end of an output filter capacitor Co; transformer T0The other end of the secondary side of the transistor is connected with the drain electrode of Q5A; the source of Q4A is connected to the source of Q5A and to the other end of the output filter capacitor Co.
In one embodiment, the controller is further configured to send trigger voltages to Q4A and Q5A at a fifty percent duty cycle and in a complementary manner to the dead band.
In one embodiment, the trigger voltages transmitted to Q2B and Q3A are determined according to the load and the preset reverse gain, and if the reverse gain is larger and the load is heavier, the transmission time length of the trigger voltages transmitted to Q2B and Q3A is longer, so that the on-time of Q2B and Q3A is longer.
That is to say, in the present disclosure, a driving manner with a fixed duty ratio of 50% and a dead zone complementary may be adopted, a Boost manner is adopted for the primary side, the primary side lower tube drives the advanced secondary side switching tube to drive on, the conduction time (Ton) of the primary side lower tube is automatically adjusted according to the required gain, the larger the reverse gain that needs to be realized is, the heavier the load is, the larger Ton is, and the advanced time Tadvance may be set to a certain value, or may be adjusted according to a voltage interval and a load interval.
Fig. 2 is a schematic diagram showing waveforms of drive/current and the like in the reverse boost operation mode in the soft switching circuit described above. When the LLC circuit is running in reverse and the primary side is in a Boost interval, the controller sends trigger voltages to Q2B, Q3A, Q4A and Q5A, wherein the controller sends trigger voltages to Q2B and Q3A ahead of the trigger voltages to Q4A and Q5A, respectively. The time of advance is determined according to the voltage interval. Specifically, in the present invention, a preferred advance time is shown in FIG. 2; firstly, in the first 1/2 period, the time for sending the trigger voltage to the Q2B is 12 time units earlier than the time for sending the trigger voltage to the Q4A, and the controller does not send the trigger voltage to the Q3A and the Q5A in the first 1/2 period; then, during the second 1/2 cycle, the controller turns off the trigger voltage to Q2B and Q4A, and in turn sends the trigger voltage to Q3A and Q5A, the time that the controller sends the trigger voltage to Q3A is 12 time units earlier than the time that the trigger voltage is sent to Q5A. The time unit is frequency dependent, in the present invention the preferred frequency is 60MHz, and then in conversion the 12 time units are 12/60MHz, i.e. 0.2 microseconds. It is further noted that the numbers shown beside the square wave in fig. 2, such as 12, 18, and 22, represent 12 time units, 18 time units, and 22 time units, respectively.
According to the soft switching circuit based on the LLC circuit, on the basis that the structure of the traditional LLC circuit is not changed, the Boost operation mode is utilized, on the basis that reverse wide-range voltage regulation is realized, the soft switching of the secondary side switching tube is realized by changing the moment of opening the primary side switching tube, the switching loss of devices is reduced, the work efficiency of reverse operation is improved, EMI noise is reduced, and the reverse operation performance of the traditional LLC is further improved.
In addition, on the basis of the LLC reverse Boost operation mode, soft switching of the secondary side switching tube can be realized by changing the switching-on time of the primary side switching tube, so that the switching loss of devices is reduced, and the work efficiency of reverse operation is improved; by realizing the soft switch, the circuit parasitic parameters are prevented from causing larger voltage oscillation at the moment of switching the switch tube, the EMI noise is reduced, the voltage withstand requirement of the switch tube is reduced, and the cost of the converter is reduced. The traditional advantage of forward operation of the LLC is kept, and meanwhile, the reverse operation performance of the traditional LLC is further improved, so that the LLC topology has more advantages in the situation of bidirectional flow of electric energy, and the application scene of the LLC topology is widened.
Corresponding to the soft switching circuit based on the LLC circuit shown in fig. 1, the present disclosure also provides a control method, and fig. 3 is a flowchart of a control method provided in an embodiment of the present disclosure, where the control method includes:
s301: and acquiring a voltage interval of the LLC circuit.
S302: when the LLC circuit is operating in reverse and the primary side is in a Boost interval, trigger voltages are sent to Q2B, Q3A, Q4A, and Q5A, where sending trigger voltages to Q2B and Q3A is earlier than sending trigger voltages to Q4A and Q5A, respectively.
In one embodiment, sending the trigger voltage to Q4A and Q5A includes sending the trigger voltage to Q4A and Q5A at a fifty percent duty cycle and in a complementary manner to the dead band.
In one embodiment, the trigger voltages transmitted to Q2B and Q3A are determined according to the load and the preset reverse gain, and if the reverse gain is larger and the load is heavier, the transmission time length of the trigger voltages transmitted to Q2B and Q3A is longer, so that the on-time of Q2B and Q3A is longer.
According to the control method provided by the soft switching circuit based on the LLC circuit, on the basis of not changing the structure of the traditional LLC circuit, the Boost operation mode is utilized, on the basis of realizing reverse wide-range voltage regulation, the soft switching of the secondary side switching tube is realized by changing the moment of switching on the primary side switching tube, the switching loss of devices is reduced, the working efficiency of reverse operation is improved, the EMI noise is reduced, and the reverse operation performance of the traditional LLC is further improved.
It is noted that while for simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present disclosure is not limited by the order of acts, as some steps may, in accordance with the present disclosure, occur in other orders and concurrently. Further, those skilled in the art should also appreciate that the embodiments described in the specification are exemplary embodiments and that acts and modules referred to are not necessarily required by the disclosure.
Corresponding to the control method of the soft switching circuit based on the LLC circuit shown in fig. 3, the present disclosure also provides a control apparatus.
Fig. 4 shows a schematic structural diagram of a control apparatus, which may include an obtaining module 401, as shown in fig. 4, for obtaining a voltage range of an LLC circuit;
the trigger voltage sending module 402 may be configured to send the trigger voltages to Q2B, Q3A, Q4A, and Q5A when the LLC circuit operates in a reverse direction and the primary side is in a Boost interval, where sending the trigger voltages to Q2B and Q3A is earlier than sending the trigger voltages to Q4A and Q5A, respectively.
In one embodiment, the trigger voltage sending module 402 may be further configured to send the trigger voltages to Q4A and Q5A at a fifty percent duty cycle and in a complementary manner to the dead band.
In one embodiment, the trigger voltages transmitted to Q2B and Q3A are determined according to the load and the preset reverse gain, and if the reverse gain is larger and the load is heavier, the transmission time length of the trigger voltages transmitted to Q2B and Q3A is longer, so that the on-time of Q2B and Q3A is longer.
According to the control device provided by the soft switching circuit based on the LLC circuit, on the basis of not changing the structure of the traditional LLC circuit, the Boost operation mode is utilized, on the basis of realizing reverse wide-range voltage regulation, the soft switching of the secondary side switching tube is realized by changing the time when the primary side switching tube is switched on, the switching loss of devices is reduced, the working efficiency of reverse operation is improved, the EMI noise is reduced, and the reverse operation performance of the traditional LLC is further improved.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the described module may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
It can be understood that each module in the control device of the soft switching circuit based on the LLC circuit shown in fig. 4 has a function of implementing each step in fig. 3, and can achieve its corresponding technical effect, and for brevity, no further description is provided herein.
In the technical scheme of the disclosure, the acquisition, storage, application and the like of the personal information of the related user all accord with the regulations of related laws and regulations, and do not violate the good customs of the public order.
The present disclosure also provides an electronic device, a readable storage medium, and a computer program product according to embodiments of the present disclosure.
FIG. 5 shows a schematic block diagram of an electronic device 500 that may be used to implement embodiments of the present disclosure. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be examples only, and are not meant to limit implementations of the disclosure described and/or claimed herein.
The device 500 comprises a computing unit 501 which may perform various suitable actions and processes in accordance with a computer program stored in a Read Only Memory (ROM) 502 or a computer program loaded from a storage unit 508 into a Random Access Memory (RAM) 503. In the RAM503, various programs and data required for the operation of the device 500 can also be stored. The calculation unit 501, the ROM502, and the RAM503 are connected to each other by a bus 504. An input/output (I/O) interface 505 is also connected to bus 504.
A number of components in the device 500 are connected to the I/O interface 505, including: an input unit 506 such as a keyboard, a mouse, or the like; an output unit 507 such as various types of displays, speakers, and the like; a storage unit 508, such as a magnetic disk, optical disk, or the like; and a communication unit 509 such as a network card, modem, wireless communication transceiver, etc. The communication unit 509 allows the device 500 to exchange information/data with other devices through a computer network such as the internet and/or various telecommunication networks.
The computing unit 501 may be a variety of general-purpose and/or special-purpose processing components having processing and computing capabilities. Some examples of the computing unit 501 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various dedicated Artificial Intelligence (AI) computing chips, various computing units running machine learning model algorithms, a Digital Signal Processor (DSP), and any suitable processor, controller, microcontroller, and so forth. The calculation unit 501 performs the various methods and processes described above, such as the control method of the LLC circuit-based soft switching circuit in fig. 3. For example, in some embodiments, the control method of the LLC circuit-based soft switching circuit in fig. 3 can be implemented as a computer software program tangibly embodied in a machine-readable medium, such as the storage unit 508. In some embodiments, part or all of the computer program may be loaded and/or installed onto the device 500 via the ROM502 and/or the communication unit 509. When the computer program is loaded into the RAM503 and executed by the computing unit 501, one or more steps of the control method of the soft switching circuit based on the LLC circuit described above may be performed. Alternatively, in other embodiments, the computing unit 501 may be configured by any other suitable means (e.g., by means of firmware) to perform the control method of the LLC circuit-based soft switching circuit in fig. 3.
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, Field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.
Program code for implementing the methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowchart and/or block diagram to be performed. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user can provide input to the computer. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), Wide Area Networks (WANs), and the Internet.
The computer system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server may be a cloud server, a server of a distributed system, or a server with a combined blockchain.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present disclosure may be executed in parallel, sequentially, or in different orders, as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved, and the present disclosure is not limited herein.
The above detailed description should not be construed as limiting the scope of the disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present disclosure should be included in the scope of protection of the present disclosure.
Claims (10)
1. A soft switching circuit based on an LLC circuit comprises a primary side, a transformer, a secondary side and a controller; the primary side is a full-bridge circuit and comprises a direct-current input source, a first bridge arm switching tube consisting of Q2A and Q2B, a second bridge arm switching tube consisting of Q3A and Q3B, and an LLC resonance tank consisting of a resonance capacitor, a resonance inductor and an excitation inductor;
a center tap is arranged in the transformer;
the secondary side is a rectifying circuit consisting of Q4A, Q5A and an output filter capacitor;
Q2A, Q2B, Q3A, Q3B, Q4A, Q5A are MOSFETs;
diodes D2A, D2B, D3A and D3B are respectively connected in parallel between the source and drain electrodes of Q2A, Q2B, Q3A and Q3B; diodes D4A and D5A are connected between the source and drain electrodes of Q4A and Q5A in parallel respectively;
the controller is used for acquiring a voltage interval of the LLC circuit;
when the LLC circuit is operated in reverse and the primary side is in a Boost interval, the controller is further configured to send trigger voltages to Q2B, Q3A, Q4A and Q5A, wherein the controller sends trigger voltages to Q2B and Q3A ahead of sending trigger voltages to Q4A and Q5A, respectively.
2. The soft switching circuit of claim 1, wherein the controller is further configured to send trigger voltages to Q4A and Q5A at a fifty percent duty cycle and in a complementary dead band manner.
3. The soft switch circuit of claim 2, wherein the trigger voltage transmitted to the Q2B and the Q3A is determined according to a load and a preset reverse gain, and if the reverse gain is larger and the load is heavier, the transmission time period for transmitting the trigger voltage to the Q2B and the Q3A is longer, so that the on-time of the Q2B and the Q3A is longer.
4. A control method for a soft switching circuit according to any one of claims 1 to 3, wherein the control method comprises:
acquiring a voltage interval of the LLC circuit;
when the LLC circuit is operated in reverse and the primary side is in a Boost interval, sending trigger voltages to Q2B, Q3A, Q4A and Q5A, wherein sending trigger voltages to Q2B and Q3A is earlier than sending trigger voltages to Q4A and Q5A, respectively.
5. The control method of claim 4, wherein sending the trigger voltage to Q4A and Q5A comprises:
the trigger voltages are sent to Q4A and Q5A in a fifty percent duty cycle and dead band complementary fashion.
6. The control method according to claim 4, wherein the trigger voltage transmitted to the Q2B and the Q3A is determined according to a load and a preset reverse gain, and if the reverse gain is larger and the load is heavier, the transmission time length of the trigger voltage transmitted to the Q2B and the Q3A is longer, so that the conduction time of the Q2B and the Q3A is longer.
7. A control device based on the soft switching circuit of any one of claims 1 to 3, wherein the control device comprises:
the obtaining module is used for obtaining a voltage interval of the LLC circuit;
and the trigger voltage sending module is used for sending trigger voltages to the Q2B, the Q3A, the Q4A and the Q5A when the LLC circuit runs in a reverse direction and the primary side is in a Boost interval, wherein the trigger voltages sent to the Q2B and the Q3A are respectively earlier than the trigger voltages sent to the Q4A and the Q5A.
8. The control device of claim 7, wherein the trigger voltage sending module is further configured to send the trigger voltages to Q4A and Q5A at a fifty percent duty cycle complementary to the dead band.
9. An electronic device, comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any of claims 4-6.
10. A non-transitory computer readable storage medium having stored thereon computer instructions for causing the computer to perform the method of any of claims 4-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210189667.5A CN114268213B (en) | 2022-03-01 | 2022-03-01 | Soft switching circuit, control method and control device based on LLC circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210189667.5A CN114268213B (en) | 2022-03-01 | 2022-03-01 | Soft switching circuit, control method and control device based on LLC circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114268213A true CN114268213A (en) | 2022-04-01 |
| CN114268213B CN114268213B (en) | 2022-05-10 |
Family
ID=80833847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210189667.5A Active CN114268213B (en) | 2022-03-01 | 2022-03-01 | Soft switching circuit, control method and control device based on LLC circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114268213B (en) |
Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0665633A2 (en) * | 1994-01-27 | 1995-08-02 | Vlt Corporation | Power conversion |
| US20080074905A1 (en) * | 2006-09-22 | 2008-03-27 | Kabushiki Kaisha Toyota Jidoshokki | Method for Controlling Bidirectional DC-DC Converter |
| JP2010206858A (en) * | 2009-02-27 | 2010-09-16 | Tdk Corp | Switching power supply |
| US20120262954A1 (en) * | 2011-04-15 | 2012-10-18 | Power Integrations, Inc. | Off line resonant converter with merged line rectification and power factor correction |
| CN103944396A (en) * | 2014-04-11 | 2014-07-23 | 燕山大学 | LLC resonance type three-port DC-DC converter and control method thereof |
| CN204465374U (en) * | 2015-03-18 | 2015-07-08 | 深圳市保益新能电气有限公司 | A kind of high-frequency isolation ac-dc conversion circuit |
| CN105896986A (en) * | 2014-12-11 | 2016-08-24 | 南京航空航天大学 | Resonant converter and control method thereof |
| EP3098956A1 (en) * | 2015-05-26 | 2016-11-30 | Hitachi, Ltd. | Power conversion device and power conversion control method for the same |
| US20170141691A1 (en) * | 2014-05-26 | 2017-05-18 | Zte Corporation | Switch Power Source and Method for Controlling Switch Power Source |
| CN107733236A (en) * | 2017-10-27 | 2018-02-23 | 深圳市保益新能电气有限公司 | A kind of two-way Sofe Switch DC transfer circuit of wide scope and its control method |
| CN111010043A (en) * | 2019-12-25 | 2020-04-14 | 湖北工业大学 | Full-bridge LLC resonant converter fixed-frequency control method |
| CN112202336A (en) * | 2020-09-17 | 2021-01-08 | 华南理工大学 | Control method of bidirectional CLLLC type converter capable of automatically switching power directions |
| WO2021027675A1 (en) * | 2019-08-09 | 2021-02-18 | 海信视像科技股份有限公司 | Switching power supply device |
| CN113595383A (en) * | 2020-04-30 | 2021-11-02 | 华为技术有限公司 | Switched capacitor circuit, charging control system and terminal equipment |
| CN113765405A (en) * | 2021-09-28 | 2021-12-07 | 国网江苏省电力有限公司泰州供电分公司 | Novel three-phase interleaved parallel DC-DC converter |
| CN113965093A (en) * | 2021-12-21 | 2022-01-21 | 江苏由甲申田新能源科技有限公司 | DC-DC converter circuit and operating method |
| CN114123801A (en) * | 2022-01-25 | 2022-03-01 | 常州索维尔电子科技有限公司 | Boost circuit based on LLC circuit, control method, control device and electronic equipment |
-
2022
- 2022-03-01 CN CN202210189667.5A patent/CN114268213B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0665633A2 (en) * | 1994-01-27 | 1995-08-02 | Vlt Corporation | Power conversion |
| US20080074905A1 (en) * | 2006-09-22 | 2008-03-27 | Kabushiki Kaisha Toyota Jidoshokki | Method for Controlling Bidirectional DC-DC Converter |
| JP2010206858A (en) * | 2009-02-27 | 2010-09-16 | Tdk Corp | Switching power supply |
| US20120262954A1 (en) * | 2011-04-15 | 2012-10-18 | Power Integrations, Inc. | Off line resonant converter with merged line rectification and power factor correction |
| CN103944396A (en) * | 2014-04-11 | 2014-07-23 | 燕山大学 | LLC resonance type three-port DC-DC converter and control method thereof |
| US20170141691A1 (en) * | 2014-05-26 | 2017-05-18 | Zte Corporation | Switch Power Source and Method for Controlling Switch Power Source |
| CN105896986A (en) * | 2014-12-11 | 2016-08-24 | 南京航空航天大学 | Resonant converter and control method thereof |
| CN204465374U (en) * | 2015-03-18 | 2015-07-08 | 深圳市保益新能电气有限公司 | A kind of high-frequency isolation ac-dc conversion circuit |
| EP3098956A1 (en) * | 2015-05-26 | 2016-11-30 | Hitachi, Ltd. | Power conversion device and power conversion control method for the same |
| CN107733236A (en) * | 2017-10-27 | 2018-02-23 | 深圳市保益新能电气有限公司 | A kind of two-way Sofe Switch DC transfer circuit of wide scope and its control method |
| WO2021027675A1 (en) * | 2019-08-09 | 2021-02-18 | 海信视像科技股份有限公司 | Switching power supply device |
| CN111010043A (en) * | 2019-12-25 | 2020-04-14 | 湖北工业大学 | Full-bridge LLC resonant converter fixed-frequency control method |
| CN113595383A (en) * | 2020-04-30 | 2021-11-02 | 华为技术有限公司 | Switched capacitor circuit, charging control system and terminal equipment |
| CN112202336A (en) * | 2020-09-17 | 2021-01-08 | 华南理工大学 | Control method of bidirectional CLLLC type converter capable of automatically switching power directions |
| CN113765405A (en) * | 2021-09-28 | 2021-12-07 | 国网江苏省电力有限公司泰州供电分公司 | Novel three-phase interleaved parallel DC-DC converter |
| CN113965093A (en) * | 2021-12-21 | 2022-01-21 | 江苏由甲申田新能源科技有限公司 | DC-DC converter circuit and operating method |
| CN114123801A (en) * | 2022-01-25 | 2022-03-01 | 常州索维尔电子科技有限公司 | Boost circuit based on LLC circuit, control method, control device and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114268213B (en) | 2022-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10411700B2 (en) | Method and apparatus for driving power switch tube | |
| US20150194909A1 (en) | Zvs voltage source inverter | |
| CN108599549B (en) | Totem pole PFC circuit, pulse width control method, air conditioner and storage medium | |
| CN108809075B (en) | Totem pole PFC circuit, pulse width control method, air conditioner and storage medium | |
| CN115224952B (en) | Control method of bidirectional power converter and bidirectional power converter | |
| CN114123801B (en) | Control method and control device of boost circuit based on LLC circuit | |
| CN112803780A (en) | Converter and power adapter | |
| US20200403496A1 (en) | Two-stage converter and method for starting the same, llc converter, and application system | |
| CN114268213B (en) | Soft switching circuit, control method and control device based on LLC circuit | |
| CN108696116B (en) | Totem pole PFC circuit, pulse width control method, air conditioner and storage medium | |
| CN114123740A (en) | Control method and control device of switching power supply and electronic equipment | |
| WO2016177031A1 (en) | High voltage input control method and apparatus | |
| CN111342684B (en) | Single-phase three-level Buck PFC rectifier and control method thereof | |
| WO2016082418A1 (en) | Power factor control method and apparatus | |
| CN111030443A (en) | Totem-pole bridgeless PFC circuit, control method, electronic device and medium | |
| US11616446B1 (en) | Power supply having a resonant topology, method of operating a power supply having a resonant topology and apparatus | |
| CN209911804U (en) | Aging feedback load control circuit of pulse current working state | |
| JP2015122903A (en) | Switching power-supply device and power conversion device | |
| CN113224931B (en) | Rectifier control method, device, equipment and storage medium | |
| Vuchev et al. | Analysis of continuous current mode of an LLC resonant DC-DC converter at ZVS | |
| CN215378784U (en) | Inverter bridge control circuit and electric control equipment | |
| CN114337310B (en) | Control method, device and medium for reducing voltage stress | |
| CN114337232B (en) | Soft start circuit, soft start method, switching power supply, device, and storage medium | |
| CN204597791U (en) | A kind of digital switch power supply based on DSP | |
| CN215580939U (en) | Thing networking device power supply unit for commodity circulation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 213300 building 19, No. 618, wharf West Street, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province Patentee after: Changzhou Shiwei Electronics Co.,Ltd. Address before: 213300 building 19, No. 618, wharf West Street, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province Patentee before: CHANGZHOU SOARWHALE ELECTRONIC TECHNOLOGY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |