CN116111814A - Control method and device applied to LLC resonant circuit - Google Patents

Abstract

The invention discloses a control method and a control device applied to an LLC resonant circuit, which are used for responding to a circuit gain adjustment request, acquiring the current running state of the LLC resonant circuit, determining corresponding action instructions based on the circuit gain adjustment request and the current running state, and switching on-off states of a first switch group, a second switch group and a third switch according to the action instructions, so that the LLX resonant circuit can be switched to different circuit modes according to different gain requirements, and the problem that when the output voltage variation range of a power supply module is large, the switching frequency variation of the three-phase LLC resonant circuit is large, the waveform difference of resonant current is caused, and the running stability of the circuit is improved.

Description

Control method and device applied to LLC resonant circuit

Technical Field

The invention relates to the technical field of control of LLC resonant circuits, in particular to a control method and a control device applied to an LLC resonant circuit.

Background

With the great development of new energy automobile industry in China, the electric automobile conservation amount is rapidly increasing, and the demand of people for the electric automobile is increasing, but under the condition of the existing battery technology, the rapid development of the electric automobile is restricted by the problems of long charging time of the electric automobile, high cost of a charging pile, high failure rate and the like, and the charging module serving as a core component of the charging pile restricts the charging time of the electric automobile, the cost and reliability of the charging pile. Under the existing charging module technology, the output constant power range is narrower, so that electric vehicles of certain vehicle types cannot be charged at the maximum power point, and the charging duration is restricted. In order to widen the constant power output range of the charging module, many manufacturers realize the charging module by adding power devices, but the charging module has the advantages of greatly increasing the cost, low efficiency in a low-voltage constant power range and low reliability.

In the prior art, the charging pile module is mainly formed by a three-phase LLC resonant circuit structure, the gain linearity is high when the amplitude frequency is near, the system efficiency is high, and the constant power output can be realized in the range near the resonant point.

However, in the above prior art, when the output voltage variation range of the power supply module is large, the switching frequency of the three-phase LLC resonant circuit is greatly changed, resulting in poor resonant current waveform, and reduced stability of circuit operation.

Disclosure of Invention

The invention provides a control method and a control device applied to an LLC resonant circuit, which solve the technical problems that when the change range of the output voltage of a power module is large, the change of the switching frequency of the LLC resonant circuit is large, the waveform of resonant current is poor, and the running stability of the circuit is reduced in the prior art by adopting the traditional LLC resonant circuit.

The invention provides a control method applied to an LLC resonant circuit, wherein a first switch group, a second switch group and a third switch are arranged on the LLC resonant circuit, a primary winding of a first isolation transformer, a primary winding of a second isolation transformer and a primary winding of a third isolation transformer are connected through the first switch group, a secondary winding of the first isolation transformer is connected with two groups of power switch tubes through the third switch, and the primary winding of the first isolation transformer, the primary winding of the second isolation transformer and the primary winding of the third isolation transformer are respectively connected with two groups of power switch tubes through the second switch group, and the method comprises the following steps:

responding to a circuit gain adjustment request, and acquiring the current running state of the LLC resonant circuit;

determining a corresponding action instruction based on the circuit gain adjustment request and the current running state;

and switching on/off states of the first switch group, the second switch group and the third switch according to the action instruction.

Optionally, the step of obtaining the current operating state of the LLC resonant circuit in response to a circuit gain adjustment request includes:

responding to a circuit gain adjustment request, and acquiring the current on-off states of the first switch group, the second switch group and the third switch of the LLC resonant circuit;

if the on-off state of the first switch group is closed and the on-off state of the third switch is open, judging that the current running state is a high-voltage mode;

if the on-off state of the first switch group is off and the on-off state of the third switch is off, judging that the current running state is in a low-voltage mode;

and if the on-off state of the first switch group is open and the on-off state of the third switch is closed, judging that the current running state is in a low current mode.

Optionally, the second switch group includes a first gain switch, a second gain switch, and a third gain switch, and when the circuit gain adjustment request is a high-voltage output, the step of determining a corresponding action instruction based on the circuit gain adjustment request and the current running state includes:

if the current running state is in a low-voltage mode, determining that the action instruction is to close the first switch group, open the first gain switch, the second gain switch and the third gain switch;

and if the current running state is in a low-current mode, the action instruction is to close the first switch group, open the first gain switch and open the third switch.

Optionally, when the circuit gain adjustment request is an output low voltage, the step of determining a corresponding action instruction based on the circuit gain adjustment request and the current operation state includes:

if the current running state is in a high-voltage mode, the action instruction is to open the first switch group and close the second switch group;

and if the current running state is in a low-current mode, closing the second gain switch and the third gain switch, and opening the third switch.

Optionally, when the circuit gain adjustment request is to output a low current, the step of determining a corresponding action instruction based on the circuit gain adjustment request and the current running state includes:

if the current running state is in a high-voltage mode, the action instruction is to open the first switch group, close the first gain switch and the third switch;

and if the current running state is in a low-voltage mode, the action instruction is to close the second gain switch, the third gain switch and the third switch.

The second aspect of the present invention provides a control device applied to an LLC resonant circuit, where the LLC resonant circuit is provided with a first switch group, a second switch group, and a third switch, the primary winding of a first isolation transformer, the primary winding of a second isolation transformer, and the primary winding of a third isolation transformer are connected by the first switch group, the secondary winding of the first isolation transformer is connected with two groups of power switching tubes by the third switch, and the primary winding of the first isolation transformer, the primary winding of the second isolation transformer, and the primary winding of the third isolation transformer are respectively connected with two groups of power switching tubes by the second switch group, the device includes:

an operation state obtaining module, configured to obtain a current operation state of the LLC resonant circuit in response to a circuit gain adjustment request;

the data processing module is used for determining a corresponding action instruction based on the circuit gain adjustment request and the current running state;

and the execution module is used for switching the on-off states of the first switch group, the second switch group and the third switch according to the action instruction.

Optionally, the operation state acquisition module includes:

the switch state acquisition submodule is used for responding to a circuit gain adjustment request and acquiring the current on-off states of the first switch group, the second switch group and the third switch of the LLC resonant circuit;

the first state judging sub-module is used for judging that the current running state is a high-voltage mode if the on-off state of the first switch group is closed and the on-off state of the third switch is open;

the second state judging sub-module is used for judging that the current running state is in a low-voltage mode if the on-off state of the first switch group is off and the on-off state of the third switch is off;

and the third state judging sub-module is used for judging that the current running state is in a low current mode if the on-off state of the first switch group is open and the on-off state of the third switch is closed.

Optionally, the second switch group includes a first gain switch, a second gain switch, and a third gain switch, and when the circuit gain adjustment request is to output a high voltage, the data processing module includes:

the first state execution sub-module is used for determining that the action instruction is to close the first switch group, open the first gain switch, the second gain switch and the third gain switch if the current running state is in a low-voltage mode;

and the second state execution submodule is used for closing the first switch group, opening the first gain switch and opening the third switch if the current running state is in a low-current mode.

Optionally, when the circuit gain adjustment request is an output low voltage, the data processing module includes:

the third state execution sub-module is used for opening the first switch group and closing the second switch group if the current running state is a high-voltage mode;

and the fourth state execution submodule is used for closing the second gain switch and the third gain switch and opening the third switch if the current running state is in a low-current mode.

Optionally, when the circuit gain adjustment request is to output a low current, the data processing module includes:

a fifth state execution sub-module, configured to, if the current operation state is a high voltage mode, open the first switch group, close the first gain switch, and close the third switch;

and the sixth state execution submodule is used for closing the second gain switch, the third gain switch and the third switch if the current running state is in a low-voltage mode.

From the above technical scheme, the invention has the following advantages:

when a circuit gain adjustment request sent by a technician is received, the current running state of the LLC resonant circuit is obtained, the circuit gain adjustment request is analyzed, the running state of the LLC resonant circuit which needs to be switched is determined, the action instructions which need to be executed by the first switch group, the second switch group and the third switch are determined according to the current running state and the required switching running state of the LLC resonant circuit, and the on-off states of the first switch group, the second switch group and the third switch are switched according to the action instructions, so that the LLC resonant circuit can adjust the circuit gain according to the change of the output voltage, and the technical problems that when the change range of the output voltage of a power supply module is larger, the change of the switching frequency of the LLC resonant circuit is larger, the waveform of the resonant current is poor, and the running stability of the circuit is reduced in the prior art are solved.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a flow chart of steps of a control method applied to an LLC resonant circuit according to a first embodiment of the present invention;

fig. 2 is a flow chart of steps of a control method applied to an LLC resonant circuit according to a second embodiment of the invention;

FIG. 3 is a schematic circuit diagram of a LLC resonant circuit according to a second embodiment of the present invention;

FIG. 4 is a schematic circuit diagram of a LLC resonant circuit according to a second embodiment of the present invention;

FIG. 5 is a schematic circuit diagram of a LLC resonant circuit according to a second embodiment of the present invention;

fig. 6 is a block diagram of a control device applied to an LLC resonant circuit according to a third embodiment of the invention.

Detailed Description

The embodiment of the invention provides a control method and a control device applied to an LLC resonant circuit, which are used for solving the technical problems that when the variation range of the output voltage of a power module is large, the switching frequency of the three-phase LLC resonant circuit is large, the waveform of resonant current is poor, and the running stability of the circuit is reduced in the prior art.

In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1, fig. 1 is a flowchart illustrating steps of a control method applied to an LLC resonant circuit according to an embodiment of the invention.

The invention provides a control method applied to an LLC resonant circuit, wherein a first switch group, a second switch group and a third switch are arranged on the LLC resonant circuit, a primary winding of a first isolation transformer, a primary winding of a second isolation transformer and a primary winding of a third isolation transformer are connected through the first switch group, a secondary winding of the first isolation transformer is connected with two groups of power switch tubes through the third switch, and the primary winding of the first isolation transformer, the primary winding of the second isolation transformer and the primary winding of the third isolation transformer are respectively connected with two groups of power switch tubes through the second switch group, and the method comprises the following steps:

step 101, responding to a circuit gain adjustment request, and acquiring the current running state of the LLC resonant circuit.

The circuit gain adjustment request refers to a control request issued by a technician to input and output different gain requirements to the LLC resonant circuit. For example, when the LLC resonant circuit needs to output a high voltage, the LLC resonant circuit needs to output a low voltage, and the LLC resonant circuit needs to output a low current.

The current running state refers to the control mode of the gain of the input and output of the current LLC resonant circuit. Such as a high voltage mode, a low voltage mode, and a low current mode.

In the embodiment of the invention, when receiving the circuit gain adjustment sent by a person skilled in the art, the control mode of the LLC resonant circuit is obtained by reading the on-off states of the current first switch group, the second switch group and the third switch through the operation platform.

Step 102, determining a corresponding action instruction based on the circuit gain adjustment request and the current running state.

The action command refers to switching of the switching states of a first switch group, a second switch group and a third switch in the LLC resonant circuit. For example, a circuit breaker, a disconnector, an air switch, a knife switch, a relay, etc. are closed, and a circuit breaker, a disconnector, an air switch, a knife switch, a relay, etc. are opened.

In the embodiment of the invention, after the control mode of the current LLC resonant circuit and the control mode of the LLC resonant circuit required to be switched are obtained, the action instructions required to be executed by the first switch group, the second switch group and the third switch are adjusted according to the on-off states of the first switch group, the second switch group and the third switch of the current LLC resonant circuit and the control mode of the LLC resonant circuit required to be switched.

Step 103, switching on/off states of the first switch group, the second switch group and the third switch according to the action instruction.

In the embodiment of the invention, after the action instruction is acquired, the first switch group, the second switch group and the third switch are controlled to be closed or opened according to the action instruction.

In the embodiment of the invention, when receiving an LLC resonant circuit gain adjustment request sent by a technician, the control mode of the LLC resonant circuit is obtained by reading the on-off states of the current first switch group, the second switch group and the third switch through an operation platform, and according to the control mode of the current LLC resonant circuit and the control mode required to be switched, the action instructions required to be executed by the first switch group, the second switch group and the third switch are determined, and then the first switch group, the second switch group and the third switch are controlled to be closed or opened according to the action instructions. The technical problems that when the output voltage variation range of a power module is large, the switching frequency of the LLC resonant circuit is large, the resonant current waveform is poor, and the stability of circuit operation is reduced are solved, the wide gain adjustment of the LLC resonant circuit is realized, and the stability of circuit operation is improved.

Referring to fig. 2, fig. 2 is a flowchart illustrating steps of a control method for an LLC resonant circuit according to a second embodiment of the invention.

The invention provides a control method applied to an LLC resonant circuit, wherein a first switch group, a second switch group and a third switch are arranged on the LLC resonant circuit, a primary winding of a first isolation transformer, a primary winding of a second isolation transformer and a primary winding of a third isolation transformer are connected through the first switch group, a secondary winding of the first isolation transformer is connected with two groups of power switch tubes through the third switch, and the primary winding of the first isolation transformer, the primary winding of the second isolation transformer and the primary winding of the third isolation transformer are respectively connected with two groups of power switch tubes through the second switch group, and the method comprises the following steps:

step 201, the on-off states of the current first switch group, the second switch group and the third switch of the LLC resonant circuit are obtained in response to a circuit gain adjustment request.

The first switch group, the second switch group and the third switch refer to a relay or an intelligent short-circuiting device, etc.

The on-off state refers to the state in which the switch in the line is closed or open.

In the embodiment of the invention, when receiving a circuit gain adjustment request sent by a technician, the on-off states of the first switch group, the second switch group and the third switch are acquired through the operation platform.

Step 202, if the on-off state of the first switch group is closed and the on-off state of the third switch is open, determining that the current operation state is a high voltage mode.

Referring to fig. 3, the second switch group includes a first gain switch S21, a second gain switch S22 and a third gain switch S23, the first switch group includes S11, S12 and S13, the on-off state of the third switch S3 is off, the on-off state of the first switch group is on, the on-off states of the first gain switch S21, the second gain switch S22 and the third gain switch S23 in the second switch group are all off, and all the switching tubes in the LLC resonant circuit are used for adjusting the output voltage, so that the LLC resonant circuit has a higher circuit gain, and therefore, the operating state of the LLC resonant circuit is in a high-voltage mode.

The high voltage mode refers to an electrical connection structure when the LLC resonant circuit outputs a high voltage.

In the embodiment of the invention, when the on-off states of the first switch group are all closed and the on-off state of the third switch is open, the current running state of the LLC resonant circuit is judged to be a high-voltage mode.

Step 203, if the on-off state of the first switch group is off and the on-off state of the third switch is off, determining that the current operation state is in a low voltage mode.

Referring to fig. 4, the on/off state of the first switch set is closed, the on/off states of the first gain switch S21, the second gain switch S22 and the third gain switch S23 are all closed, the on/off state of the third switch S3 is open, at this time, the resonant cavity of the LLC resonant circuit is switched from the star connection of the conventional LLC resonant circuit to the delta connection, and under the same switching frequency, the gain of the LLC resonant circuit can be reduced, so that the operating state of the LLC resonant circuit is in a low voltage mode.

The low voltage mode refers to an electrical connection structure when the LLC resonant circuit outputs a low voltage.

In the embodiment of the invention, when the on-off state of the first switch group is the on-off state and the on-off state of the third switch is the off state, the current running state of the LLC resonant circuit is judged to be in a low voltage mode.

Step 204, if the on-off state of the first switch group is open and the on-off state of the third switch is closed, determining that the current operation state is a low current mode.

Referring to fig. 5, the on/off state of the first switch group is off, the on/off state of the first gain switch S21 is on, the on/off states of the second gain switch S22 and the third gain switch S23 are off, the on/off state of the third switch S3 is off, and the switching transistors of the LLC resonant circuit in operation are only Q1p, Q2p, Q4p, Q5p, Q1S, Q2S, Q4S and Q5S, so that the output current of the LLC resonant circuit is reduced, and therefore, the operating state of the LLC resonant circuit is in a low current mode.

In the embodiment of the invention, when the on-off state of the first switch group is open and the on-off state of the third switch is closed, the current running state of the LLC resonant circuit is determined to be in a low current mode.

Step 205, determining a corresponding action instruction based on the circuit gain adjustment request and the current operation state.

Further, step 205 may comprise the sub-steps of:

s11, when the circuit gain adjustment request is output high voltage, determining a corresponding action instruction based on the circuit gain adjustment request and the current running state, wherein the second switch group comprises a first gain switch, a second gain switch and a third gain switch, and the step comprises the following steps:

if the current running state is in a low-voltage mode, determining that the action instruction is to close the first switch group, open the first gain switch, the second gain switch and the third gain switch;

if the current running state is in a low-current mode, the action command is to close the first switch group, open the first gain switch and open the third switch.

In the embodiment of the invention, when the circuit gain adjustment request is a high-voltage output, the LLC resonant circuit is required to be switched to a high-voltage mode, if the current running state is a low-voltage mode, the action instruction is determined to be a first switch group which is closed, the first gain switch, the second gain switch and the third gain switch are opened, and if the current running state is a low-current mode, the action instruction is determined to be a first switch group which is closed, the first gain switch and the third switch are opened.

S12, when the circuit gain adjustment request is output low voltage, determining a corresponding action instruction based on the circuit gain adjustment request and the current running state, wherein the step comprises the following steps:

if the current running state is in a high-voltage mode, the action instruction is to open the first switch group and close the second switch group;

and if the current running state is in a low-current mode, closing the second gain switch and the third gain switch, and opening the third switch.

In the embodiment of the invention, when the circuit gain adjustment request is a low-voltage output, the LLC resonant circuit is required to be switched to a low-voltage mode, if the current running state is a high-voltage mode, the action command is determined to be that the first switch group is opened, the first gain switch, the second gain switch and the third gain switch are closed, and if the current running state is a low-current mode, the action command is determined to be that the second gain switch and the third gain switch are closed, and the third switch is opened.

S13, when the circuit gain adjustment request is output low current, determining a corresponding action instruction based on the circuit gain adjustment request and the current running state, wherein the step comprises the following steps:

if the current running state is in a high-voltage mode, the action instruction is to open the first switch group, close the first gain switch and close the third switch;

if the current running state is in a low-voltage mode, the action instruction is to close the second gain switch, the third gain switch and the third switch.

In the embodiment of the invention, when the circuit gain request is to output low current, the LLC resonant circuit is required to be switched to a low current mode, if the current running state is a high voltage mode, the action instruction is determined to be an opening of the first switch group, the first gain switch and the third switch are closed, and if the current running state is a low voltage mode, the action instruction is determined to be an opening of the second gain switch, the third gain switch and the third switch.

In the embodiment of the invention, after the current running state of the LLC resonant circuit and a circuit gain request are acquired, the working mode of the LLC resonant circuit which needs to be switched is determined according to the circuit gain request, if the LLC resonant circuit is switched from a low-voltage mode to a high-voltage mode, the action command is determined to be a closed first switch group, a closed first gain switch and a closed third switch, if the LLC resonant circuit is switched from a low-voltage mode to a high-voltage mode, the action command is determined to be a closed first switch group, a closed first gain switch and a closed third gain switch, if the LLC resonant circuit is switched from a low-voltage mode to a low-voltage mode, the action command is determined to be a closed second gain switch and a third gain switch, if the LLC resonant circuit is switched from a high-voltage mode to a low-voltage mode, the action command is determined to be a closed first switch group, the first gain switch and the third switch, and the second gain switch and the third gain switch are switched from a low-voltage mode, and if the LLC resonant circuit is switched from a low-voltage mode to a low-voltage mode.

And 206, switching on/off states of the first switch group, the second switch group and the third switch according to the action instruction.

In the embodiment of the invention, after the action instruction is acquired, the first switch group, the first gain switch, the second gain switch and the third switch are controlled to be closed or opened according to the action instruction.

In the embodiment of the invention, when receiving an LLC resonant circuit gain adjustment request sent by a technician, the control mode of the LLC resonant circuit to be switched is determined by analyzing the circuit gain adjustment request, the on-off state of the current first switch group, the second switch group and the third switch is acquired through an operation display interface to determine the control mode of the current LLC resonant circuit, and the action instructions to be executed by the first switch group, the second switch group and the third switch are determined according to the control mode of the current LLC resonant circuit and the control mode to be switched, and then the first switch group, the second switch group and the third switch are controlled to be closed or opened according to the action instructions. The technical problems that when the output voltage variation range of the power supply module is large, the switching frequency of the LLC resonant circuit is large, the resonant current waveform is poor, and the stability of circuit operation is reduced are solved, the wide gain adjustment of the LLC resonant circuit is realized, and the stability of circuit operation is improved.

Referring to fig. 6, fig. 6 is a block diagram of a control device for an LLC resonant circuit according to a third embodiment of the invention.

The embodiment of the invention provides a control device applied to an LLC resonant circuit, wherein a first switch group, a second switch group and a third switch are arranged on the LLC resonant circuit, a primary winding of a first isolation transformer, a primary winding of a second isolation transformer and a primary winding of a third isolation transformer are connected through the first switch group, a secondary winding of the first isolation transformer is connected with two groups of power switch tubes through the third switch, and the primary winding of the first isolation transformer, the primary winding of the second isolation transformer and the primary winding of the third isolation transformer are respectively connected with two groups of power switch tubes through the second switch group, and the device comprises:

an operation state obtaining module 601, configured to obtain a current operation state of the LLC resonant circuit in response to a circuit gain adjustment request;

a data processing module 602, configured to determine a corresponding action instruction based on the circuit gain adjustment request and the current operation state;

the execution module 603 is configured to switch on/off states of the first switch group, the second switch group, and the third switch according to the action instruction.

Further, the running state acquisition module 601 includes:

the switch state acquisition submodule is used for responding to a circuit gain adjustment request and acquiring the on-off states of the current first switch group, the second switch group and the third switch of the LLC resonant circuit;

the first state judging sub-module is used for judging that the current running state is in a high-voltage mode if the on-off state of the first switch group is closed and the on-off state of the third switch is open;

the second state judging sub-module is used for judging that the current running state is in a low-voltage mode if the on-off state of the first switch group is off and the on-off state of the third switch is off;

and the third state judging sub-module is used for judging that the current running state is in a low current mode if the on-off state of the first switch group is open and the on-off state of the third switch is closed.

Further, the second switch group includes a first gain switch, a second gain switch, and a third gain switch, and when the circuit gain adjustment request is to output a high voltage, the data processing module 602 includes:

the first state execution sub-module is used for determining that the action instruction is to close the first switch group, open the first gain switch, the second gain switch and the third gain switch if the current running state is in a low-voltage mode;

and the second state execution submodule is used for closing the first switch group and opening the first gain switch and the third switch if the current running state is in a low-current mode.

Further, when the circuit gain adjustment request is an output low voltage, the data processing module 602 further includes:

the third state execution sub-module is used for opening the first switch group and closing the second switch group according to the action instruction if the current running state is a high-voltage mode;

and the fourth state execution submodule is used for closing the second gain switch and the third gain switch and opening the third switch if the current running state is in a low-current mode.

Further, when the circuit gain adjustment request is to output a low current, the data processing module 602 further includes:

the fifth state execution sub-module is used for opening the first switch group, closing the first gain switch and closing the third switch if the current running state is in a high-voltage mode;

and the sixth state execution submodule is used for closing the second gain switch, the third gain switch and the third switch if the current running state is in a low-voltage mode.

In the embodiment of the invention, when the running state acquisition module receives a circuit gain adjustment request, the current running state of the LLC resonant circuit is acquired, then the circuit gain adjustment request is analyzed by the data processing module, the control mode of the LLC resonant circuit required to be switched is determined, the action instructions required to be executed by the first switch group, the second switch group and the third switch are determined according to the control mode of the current LLC resonant circuit and the control mode required to be switched, and the execution module controls the first switch group, the second switch group and the third switch to be closed or opened according to the action instructions. The technical problems that when the output voltage change range is large, the change of the switching frequency of the LLC resonant circuit is large, the waveform of resonant current is poor, and the stability of circuit operation is reduced are solved, the wide gain adjustment of the LLC resonant circuit is realized, and the stability of circuit operation is improved.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the apparatus and units described above may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another apparatus, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The control method applied to the LLC resonant circuit is characterized in that a first switch group, a second switch group and a third switch are arranged on the LLC resonant circuit, a primary winding of a first isolation transformer, a primary winding of a second isolation transformer and a primary winding of a third isolation transformer are connected through the first switch group, a secondary winding of the first isolation transformer is connected with two groups of power switch tubes through the third switch, and the primary winding of the first isolation transformer, the primary winding of the second isolation transformer and the primary winding of the third isolation transformer are respectively connected with two groups of power switch tubes through the second switch group, and the method comprises the following steps:

responding to a circuit gain adjustment request, and acquiring the current running state of the LLC resonant circuit;

determining a corresponding action instruction based on the circuit gain adjustment request and the current running state;

and switching on/off states of the first switch group, the second switch group and the third switch according to the action instruction.

2. The control method according to claim 1, wherein the step of obtaining a current operation state of the LLC resonant circuit in response to a circuit gain adjustment request, comprises:

responding to a circuit gain adjustment request, and acquiring the current on-off states of the first switch group, the second switch group and the third switch of the LLC resonant circuit;

if the on-off state of the first switch group is closed and the on-off state of the third switch is open, judging that the current running state is a high-voltage mode;

if the on-off state of the first switch group is off and the on-off state of the third switch is off, judging that the current running state is in a low-voltage mode;

and if the on-off state of the first switch group is open and the on-off state of the third switch is closed, judging that the current running state is in a low current mode.

3. The control method according to claim 2, wherein the second switch group includes a first gain switch, a second gain switch, and a third gain switch, and when the circuit gain adjustment request is an output high voltage, the step of determining a corresponding action instruction based on the circuit gain adjustment request and the current operation state includes:

if the current running state is in a low-voltage mode, determining that the action instruction is to close the first switch group, open the first gain switch, the second gain switch and the third gain switch;

and if the current running state is in a low-current mode, the action instruction is to close the first switch group, open the first gain switch and open the third switch.

4. A control method applied to an LLC resonant circuit according to claim 3, wherein when the circuit gain adjustment request is an output low voltage, said step of determining a corresponding action instruction based on the circuit gain adjustment request and the current operating state includes:

if the current running state is in a high-voltage mode, the action instruction is to open the first switch group and close the second switch group;

and if the current running state is in a low-current mode, closing the second gain switch and the third gain switch, and opening the third switch.

5. A control method applied to an LLC resonant circuit according to claim 3, wherein when the circuit gain adjustment request is an output low current, said step of determining a corresponding action instruction based on the circuit gain adjustment request and the current operating state includes:

if the current running state is in a high-voltage mode, the action instruction is to open the first switch group, close the first gain switch and the third switch;

and if the current running state is in a low-voltage mode, the action instruction is to close the second gain switch, the third gain switch and the third switch.

6. The utility model provides a be applied to controlling means of LLC resonant circuit, its characterized in that is provided with first switch group, second switch group and third switch on the LLC resonant circuit, first isolation transformer primary winding, second isolation transformer primary winding and third isolation transformer primary winding are through first switch group is connected, first isolation transformer secondary winding is through the third switch is connected with two sets of power switch tubes, first isolation transformer primary winding, second isolation transformer primary winding and third isolation transformer primary winding is through second switch group is connected with two sets of power switch tubes respectively, the device includes:

an operation state obtaining module, configured to obtain a current operation state of the LLC resonant circuit in response to a circuit gain adjustment request;

the data processing module is used for determining a corresponding action instruction based on the circuit gain adjustment request and the current running state;

and the execution module is used for switching the on-off states of the first switch group, the second switch group and the third switch according to the action instruction.

7. The control apparatus applied to an LLC resonant circuit according to claim 6, wherein the operating state acquisition module includes:

the switch state acquisition submodule is used for responding to a circuit gain adjustment request and acquiring the current on-off states of the first switch group, the second switch group and the third switch of the LLC resonant circuit;

the first state judging sub-module is used for judging that the current running state is a high-voltage mode if the on-off state of the first switch group is closed and the on-off state of the third switch is open;

the second state judging sub-module is used for judging that the current running state is in a low-voltage mode if the on-off state of the first switch group is off and the on-off state of the third switch is off;

and the third state judging sub-module is used for judging that the current running state is in a low current mode if the on-off state of the first switch group is open and the on-off state of the third switch is closed.

8. The control apparatus applied to an LLC resonant circuit according to claim 7, wherein the second switch group includes a first gain switch, a second gain switch, and a third gain switch, and the data processing module includes, when the circuit gain adjustment request is to output a high voltage:

the first state execution sub-module is used for determining that the action instruction is to close the first switch group, open the first gain switch, the second gain switch and the third gain switch if the current running state is in a low-voltage mode;

and the second state execution submodule is used for closing the first switch group, opening the first gain switch and opening the third switch if the current running state is in a low-current mode.

9. The control apparatus applied to an LLC resonant circuit according to claim 8, wherein when the circuit gain adjustment request is an output low voltage, the data processing module includes:

the third state execution sub-module is used for opening the first switch group and closing the second switch group if the current running state is a high-voltage mode;

and the fourth state execution submodule is used for closing the second gain switch and the third gain switch and opening the third switch if the current running state is in a low-current mode.

10. The control apparatus applied to an LLC resonant circuit according to claim 8, wherein when the circuit gain adjustment request is an output low current, the data processing module includes:

a fifth state execution sub-module, configured to, if the current operation state is a high voltage mode, open the first switch group, close the first gain switch, and close the third switch;

and the sixth state execution submodule is used for closing the second gain switch, the third gain switch and the third switch if the current running state is in a low-voltage mode.

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