CN114696623A - Soft switching method and system for charging and discharging of switching power supply - Google Patents
Soft switching method and system for charging and discharging of switching power supply Download PDFInfo
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- CN114696623A CN114696623A CN202210134960.1A CN202210134960A CN114696623A CN 114696623 A CN114696623 A CN 114696623A CN 202210134960 A CN202210134960 A CN 202210134960A CN 114696623 A CN114696623 A CN 114696623A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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Abstract
The invention discloses a soft switching method and a system for charging and discharging of a switching power supply, wherein the method comprises the following steps: judging the current working mode of the switching power supply; in a charging mode and a discharging mode, controlling the driving duty ratio of the primary side bridge type switch group to be a preset first target value; in the charging mode, controlling the driving duty ratio of the secondary bridge type switch group to be continuously adjusted to a second target value at a preset speed, and controlling the driving duty ratio of the secondary bridge type switch group to be kept at the second target value; in the discharging mode, controlling the driving duty ratio of the secondary bridge type switch group to be continuously adjusted to a first target value at a preset speed rate, and keeping the driving duty ratio of the secondary bridge type switch group at the first target value; by the switching method, two sets of different drives are respectively configured for the charging mode and the discharging mode of the switching power supply, so that the working efficiency of the switching power supply in the charging mode and the discharging mode is effectively ensured, the problem of discontinuous switching of the working modes is solved, and the working stability of the switching power supply is effectively improved.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a switching power supply charging and discharging soft switching method and system based on a bidirectional LLC resonant converter.
Background
The LLC resonant converter has the characteristics of high efficiency and easy realization of bidirectional flow of energy, and is widely used in bidirectional power supplies. The synchronous rectification of the LLC resonant converter is different from the conventional synchronous rectification, when the LLC resonant converter works in the forward direction, when the LLC resonant converter works above a higher resonance point of two resonance points, the secondary side current is in a continuous state, when the LLC resonant converter works at the higher resonance point, the secondary side current is in a critical state, and when the LLC resonant converter works below the higher resonance point, the secondary side current is in an intermittent state. The drive of the secondary switch tube can be kept consistent with the primary side in a continuous state, and the duty ratio of the secondary switch tube in an intermittent state is required to be smaller than that of the primary side, so that synchronous rectification is closed before the current is zero, and otherwise, the current is caused to flow back to the explosion machine.
Therefore, because of the special feature of the synchronous rectification of the LLC resonant converter, the existing control strategy is to set the secondary duty cycle to fix a value smaller than the primary duty cycle, leave sufficient margin, and ensure that the synchronous rectification is turned off in advance when the secondary current is zero.
However, during the reverse discharge operation, the LLC resonant converter will degrade into an LC resonant converter, in which case the primary side acts as a synchronous rectifier and the secondary side acts as a resonant generator. In this reverse operation state, in order to ensure the operation efficiency, the primary side drive and the secondary side drive of the LC resonant converter need to be configured such that the duty ratio of the two-side drive is fixed to be close to 50%.
In summary, since the drive configurations of the LLC resonant converter operating in the forward and reverse states are different, the drive configurations are also switched synchronously when charging and discharging are switched mutually. The current switching mode is hard switching, the hard switching cannot realize continuous and seamless switching, and forced continuity can cause the drive to change back and forth at the critical point of charge-discharge switching, so that the system is unstable. In addition, the driving is not changed when the forward charging mode is changed into the reverse working mode, and the driving of the forward charging mode is still used, so that the charging and discharging switching can be continuous, and seamless switching can be realized, but the charging driving is still adopted for discharging, and the driving of the secondary side is a fixed value and less than 50%, which is not beneficial to the improvement of the discharging efficiency, because the duty ratio of the secondary side in the discharging mode should be close to 50%, which is more suitable, and the efficiency is higher at the moment.
Disclosure of Invention
The present invention aims to solve the above-mentioned technical problems and provide a method and a system for soft switching of charging and discharging of a switching power supply based on a bidirectional LLC resonant converter, which can realize continuous soft switching of charging and discharging states, and can also configure different drives for forward charging operation and reverse operation respectively to ensure working efficiency.
In order to achieve the above object, the present invention discloses a soft switching method for charging and discharging of a switching power supply based on a bidirectional LLC resonant converter, where the switching power supply includes an LLC resonant circuit, a primary side bridge switch set disposed on a primary side of the LLC resonant circuit, and a secondary side bridge switch set disposed on a secondary side of the LLC resonant circuit, the switching power supply includes a charging mode and a discharging mode, and the soft switching method for charging and discharging of the switching power supply includes:
judging the current working mode of the switching power supply;
in the charging mode and the discharging mode, controlling the driving duty ratio of the primary side bridge type switch group to be a preset first target value;
in the charging mode, judging whether the driving duty ratio of the secondary bridge type switch group reaches a preset second target value, wherein the second target value is smaller than the first target value, if not, controlling the driving duty ratio of the secondary bridge type switch group to be continuously adjusted to the second target value at a preset speed, and controlling the driving duty ratio of the secondary bridge type switch group to be kept at the second target value;
and in the discharging mode, judging whether the driving duty ratio of the secondary bridge type switch group reaches the first target value, if not, controlling the driving duty ratio of the secondary bridge type switch group to be continuously adjusted to the first target value at a preset speed, and keeping the driving duty ratio of the secondary bridge type switch group at the first target value.
Preferably, in the charging mode, the second target value is a variation interval, duty ratios with different magnitudes in the variation interval correspond to the operating frequency of the secondary bridge switch set, and the driving duty ratio of the secondary bridge switch set is controlled to dynamically vary along with the operating frequency of the secondary bridge switch set in the variation interval.
Preferably, the method for determining the operating mode of the switching power supply includes:
and judging whether the current is greater than or equal to a first preset current, if so, enabling the switching power supply to be in the charging mode, and if not, enabling the switching power supply to be in the discharging mode.
Preferably, the method for determining the operating mode of the switching power supply further includes:
if the current is smaller than the first preset current, judging whether the current is smaller than or equal to a second preset current again, wherein the second preset current is smaller than the first preset current, if so, the switching power supply is in the discharging mode, and if not, the switching power supply is judged to be kept in the current working state.
Preferably, the first target value is 50%, and the variation interval is [ 35%, 41% ].
The invention also discloses a switch power supply charging and discharging soft switching system based on the bidirectional LLC resonant converter, wherein the switch power supply comprises an LLC resonant circuit, a primary side bridge type switch group arranged on the primary side of the LLC resonant circuit and a secondary side bridge type switch group arranged on the secondary side of the LLC resonant circuit, the switch power supply comprises a charging mode and a discharging mode, and the switching system comprises a working mode judging module, a charging driving adjusting module and a discharging driving adjusting module;
the working mode judging module is used for judging the current working mode of the switching power supply;
the charging driving adjustment module is used for continuously adjusting the driving duty ratio of the secondary side bridge switch group to a second target value at a preset rate in the charging mode, and controlling the driving duty ratio of the primary side bridge switch group to be a preset first target value, wherein the second target value is smaller than the first target value;
and the discharge driving adjustment module is used for continuously adjusting the driving duty ratio of the secondary bridge type switch group to a second target value at a preset speed in the discharge mode, controlling the driving duty ratio of the secondary bridge type switch group to be continuously adjusted to the first target value at the preset speed, and keeping the driving duty ratio of the secondary bridge type switch group at the first target value.
Preferably, in the charging mode, the second target value is a variation interval, duty ratios with different magnitudes in the variation interval correspond to operating frequencies of the secondary bridge switch sets, and the charging driving adjustment module controls driving duty ratios of the secondary bridge switch sets to dynamically vary with the operating frequencies of the secondary bridge switch sets in the variation interval.
Preferably, the working mode determining module includes a first determining module and a second determining module, the first determining module is configured to determine whether a current is greater than or equal to a first preset current, if so, the switching power supply is in the charging mode, and if not, the switching power supply is in the discharging mode; the second judging module is used for judging whether the current is smaller than or equal to a second preset current when the current is smaller than the first preset current, the second preset current is smaller than the first preset current, if so, the switching power supply is in the discharging mode, and if not, the switching power supply is judged to be kept in the current working state.
The invention also discloses another switch power supply charging and discharging soft switching system, which comprises:
one or more processors;
a memory;
and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs including instructions for performing the bidirectional LLC resonant converter-based switching power supply charge-discharge soft-switching method as described above.
The invention also discloses a computer readable storage medium, which is characterized by comprising a computer program, wherein the computer program can be executed by a processor to complete the charge and discharge soft switching method of the switching power supply based on the bidirectional LLC resonant converter.
Compared with the prior art, the soft switching method for charging and discharging of the switching power supply has the advantages that in the discharging mode, the driving duty ratios of the primary side bridge type switch group and the secondary side bridge type switch group are both fixed first target values, in the charging mode, the driving duty ratio of the primary side bridge type switch group is the first target value, the secondary side bridge type switch group is a smaller second target value, and in addition, the duty ratios are continuously adjusted to achieve the purpose of switching no matter the charging mode enters the discharging mode or the discharging mode enters the charging mode; therefore, according to the switching method, firstly, two sets of different drives are respectively configured for the charging mode and the discharging mode of the switching power supply, so that the working efficiency of the switching power supply in the charging mode and the discharging mode is effectively ensured, in addition, a strategy of soft switching of charging and discharging is adopted, the problem of discontinuous switching of the working modes is solved, and the working stability of the switching power supply is effectively improved.
Drawings
Fig. 1 is a flowchart of a soft switching method for charging and discharging a switching power supply according to an embodiment of the invention.
Fig. 2 is a flowchart of a soft switching method for charging and discharging of a switching power supply according to another embodiment of the invention.
Fig. 3 is a schematic diagram of a resonant conversion topology of the switching power supply operating in the forward charging mode according to the embodiment of the present invention.
Fig. 4 is a schematic diagram of a resonant conversion topology of the switching power supply operating in the reverse discharge mode according to the embodiment of the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
The embodiment discloses a switching power supply charging and discharging soft switching method based on a bidirectional LLC resonant converter, which is used for switching the operating mode of a switching power supply, and as shown in fig. 3, the switching power supply in the embodiment includes an LLC resonant circuit P0, a primary side bridge switch group Q1 disposed on the primary side of the LLC resonant circuit, and a secondary side bridge switch group Q2 disposed on the secondary side of the LLC resonant circuit. The switching power supply comprises a charging mode, in which current flows from the primary side to the secondary side of the LLC resonant circuit, as shown in fig. 3, and a discharging mode, in which current flows from the secondary side to the primary side of the LLC resonant circuit, as shown in fig. 4.
As shown in fig. 1, the soft switching method for charging and discharging of the switching power supply in this embodiment includes the following steps:
s1: judging the current working mode of the switching power supply;
s20: in the charging mode, controlling the driving duty ratio of the primary side bridge switch group Q1 to be a preset first target value, and judging whether the driving duty ratio of the secondary side bridge switch group Q2 reaches a preset second target value, wherein the second target value is smaller than the first target value, if not, entering S21, and if so, entering S22;
s21: controlling the driving duty ratio of the secondary side bridge type switch group Q2 to be continuously adjusted to a second target value at a preset speed;
s22: controlling the driving duty ratio of the secondary side bridge type switch group Q2 to be kept at a second target value;
s30: in the discharging mode, controlling the driving duty ratio of the primary side bridge switch group Q1 to be a preset first target value, judging whether the driving duty ratio of the secondary side bridge switch group Q2 reaches the first target value, if not, entering S31, and if so, entering S32;
s31: controlling the driving duty ratio of the secondary side bridge type switch group Q2 to be continuously adjusted to a first target value at a preset speed;
s32: the driving duty ratio of the secondary-side bridge switch group Q2 is controlled to be maintained at the first target value.
The first target value in the present embodiment is preferably 50%.
According to the switching method, the switching power supply realizes continuous seamless switching of the forward charging mode and the reverse discharging mode, the problem of discontinuous switching of the working modes of the switching power supply is solved, two sets of different drives are respectively configured for the discharging mode and the charging mode, the working efficiency of the switching power supply in the discharging mode and the charging mode is effectively ensured, and therefore stable constant voltage output of the switching power supply is realized.
The initial default working mode is used as a charging mode, after the power is on, the switching power supply enters the charging mode, the initial value of the driving duty ratio of the secondary side bridge type switch group Q2 is zero, then the driving duty ratio is continuously increased to a second target value according to a preset speed, and the second target value is smaller than the driving duty ratio (50%) of the primary side bridge type switch group Q1, so that synchronous rectification can be closed before the current is zero, and the current anti-explosion machine is avoided. When it is determined that the switching power supply enters the discharging mode from the charging mode, since the driving duty ratio of the secondary-side bridge switch group Q2 is less than 50% at this time, the driving duty ratio of the secondary-side bridge switch group Q2 is continuously increased to 50% at a predetermined rate, and the 50% operation state is maintained. When the switching power supply enters the charging mode from the discharging mode, at this time, since the driving duty ratio of the secondary-side bridge switch group Q2 is 50%, which is greater than the second target value, the driving duty ratio of the secondary-side bridge switch group Q2 is continuously decreased to the second target value at a predetermined rate, and the driving duty ratio of the secondary-side bridge switch group Q2 is controlled to be maintained at the second target value, thereby achieving soft switching of the operation mode.
Further, in the charging mode, the second target value is a variation interval, and duty ratios with different magnitudes in the variation interval correspond to the operating frequency of the secondary bridge switch group Q2. As shown in fig. 2, the method for switching between the charging modes further includes S23: the driving duty ratio of the secondary side bridge switch group Q2 is controlled to follow the dynamic change of the working frequency of the secondary side bridge switch group Q2 in a change interval. In this embodiment, the variation interval of the second target value is preferably [ 35%, 41% ], and after the switching power supply enters the charging mode, the driving duty ratio of the secondary-side bridge switch group Q2 is controlled to be within the variation interval according to the current operating frequency of the switching power supply, and the driving duty ratio of the secondary-side bridge switch group Q2 dynamically varies within the variation interval along with the variation of the operating frequency of the switching power supply, and the driving duty ratio of the secondary-side bridge switch group Q2 is controlled to be positively correlated with the operating frequency of the switching power supply. In the actual working process, the working frequency of the switching power supply correspondingly changes along with the size of the load, and the change of the load directly influences the change of the current, so that the switching method in the embodiment can realize that the driving duty ratio of the secondary side bridge type switching group Q2 changes along with the change of the loop current, and when the loop current is smaller, a smaller driving duty ratio is generated, so that a smaller turn-off current is kept, and the turn-off loss is reduced.
Further, as shown in fig. 2, the method for determining the operating mode of the switching power supply includes:
s10: and judging whether the current is greater than or equal to a first preset current, if so, determining that the switching power supply is in a charging mode, and if not, determining that the switching power supply is in a discharging mode.
In addition, in order to avoid frequent adjustment of the switching power supply due to current fluctuation, the method for determining the operating mode of the switching power supply further includes S11: if the current is smaller than the first preset current, judging whether the current is smaller than or equal to a second preset current again, if so, 7A, wherein the second preset current is smaller than the first preset current, if so, the switching power supply is in a discharging mode, and if not, the switching power supply is judged to be kept in the current working state. In this embodiment, a hysteresis region with a certain width is formed between the first preset current and the second preset current, and when the current fluctuates into the hysteresis region, the switching power supply is still considered to be in the current operating mode, and the strategy for driving the duty ratio is not adjusted, so that frequent adjustment of the switching power supply due to current fluctuation is avoided, and the working performance of the switching power supply is more stable.
In summary, the working process of the soft switching method for charging and discharging of the switching power supply disclosed by the above embodiment is as follows:
after power is on, the system automatically enters a positive charging state, the loop current is larger than-2A, the driving duty ratio of the primary side bridge type switch group Q1 is controlled to work at a fixed first target value (namely 50%), and the driving duty ratio of the secondary side bridge type switch group Q2 is controlled to be continuously adjusted from zero to within a variation interval [ 35%, 41% ] at a preset speed. In the process of charging, along with the change of the charging power of the load, the working frequency of the switching power supply changes along with the positive direction, and correspondingly, the driving duty ratio of the secondary side bridge type switch group Q2 changes along with the change in the change interval according to the preset corresponding relation. When the switching power supply is switched to the discharging mode, the loop current is smaller than-7A, the switching power supply is judged to enter the discharging mode according to the detected current loop current value, at the moment, the driving duty ratio of the secondary side bridge switch group Q2 is smaller than the first target value (50%) in the changing interval [ 35%, 41% ], therefore, the driving duty ratio of the secondary side bridge switch group Q2 is controlled to be continuously increased to 50% at a preset rate, and the driving duty ratio of the secondary side bridge switch group Q2 is fixed at 50%. When the switching power supply enters the charging mode from the discharging mode, the loop current returns to the value above-2A, at this time, the driving duty ratio of the secondary bridge switch group Q2 is 50%, and then the driving duty ratio of the secondary bridge switch group Q2 is controlled to be continuously reduced from 50% to the changing interval [ 35%, 41% ] at a preset rate. With this, the switching power supply switches between the charging mode and the discharging mode.
It should be noted that, in the above embodiments, the specific adjustment manner of the driving duty ratio of the primary side bridge switch group Q1 and the secondary side bridge switch group Q2 belongs to the common technical knowledge in the art, and details are not described herein, for example, the frequency of the switching tube is adjusted by a PWM wave or a PFM wave, so as to achieve the purpose of adjusting the driving duty ratio.
The invention also discloses a switch power supply charging and discharging soft switching system based on the bidirectional LLC resonant converter, the switch power supply comprises an LLC resonant circuit, a primary side bridge type switch group arranged on the primary side of the LLC resonant circuit and a secondary side bridge type switch group arranged on the secondary side of the LLC resonant circuit, the switch power supply comprises a charging mode and a discharging mode, the switching system comprises a working mode judging module, a charging driving adjusting module, a discharging driving adjusting module, a charging voltage regulating module, a voltage regulating module and a voltage regulating module,
The working mode judging module is used for judging the current working mode of the switching power supply.
The charging driving adjustment module is configured to continuously adjust the driving duty ratio of the secondary side bridge switch group to a second target value at a predetermined rate in the charging mode, and control the driving duty ratio of the primary side bridge switch group to be a preset first target value, where the second target value is smaller than the first target value.
And the discharge driving adjustment module is used for continuously adjusting the driving duty ratio of the secondary bridge type switch group to a second target value at a preset speed in the discharge mode, controlling the driving duty ratio of the secondary bridge type switch group to be continuously adjusted to the first target value at the preset speed, and keeping the driving duty ratio of the secondary bridge type switch group at the first target value.
In the charging mode, the second target value is a variation interval, duty ratios with different sizes in the variation interval correspond to the working frequency of the secondary bridge switch set, and the charging driving adjustment module controls the driving duty ratio of the secondary bridge switch set to dynamically vary along with the working frequency of the secondary bridge switch set in the variation interval.
The working mode judging module comprises a first judging module and a second judging module, the first judging module is used for judging whether the current is greater than or equal to a first preset current, if so, the switching power supply is in the charging mode, and if not, the switching power supply is in the discharging mode; the second judging module is used for judging whether the current is smaller than or equal to a second preset current when the current is smaller than the first preset current, the second preset current is smaller than the first preset current, if so, the switching power supply is in the discharging mode, and if not, the switching power supply is judged to be kept in the current working state.
The working principle and the working mode of the switching power supply charging and discharging soft switching system in this embodiment are described in detail in the above switching power supply charging and discharging soft switching method, and are not described herein again.
The invention also discloses another switching power supply charging and discharging soft switching system, which comprises one or more processors, a memory and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the programs comprise instructions for executing the switching power supply charging and discharging soft switching method. The processor may be a general Central Processing Unit (CPU), a microprocessor, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits, and is configured to execute related programs to implement functions required to be executed by modules in the soft switching system for charging and discharging the switching power supply, or to execute the soft switching method for charging and discharging the switching power supply according to the embodiment of the present Application.
The invention also discloses a computer readable storage medium, which comprises a computer program, wherein the computer program can be executed by a processor to complete the soft switching method for charging and discharging the switching power supply. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more of the available media. The usable medium may be a read-only memory (ROM), or a Random Access Memory (RAM), or a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape, a magnetic disk, or an optical medium, such as a Digital Versatile Disk (DVD), or a semiconductor medium, such as a Solid State Disk (SSD).
The embodiment of the application also discloses a computer program product or a computer program, which comprises computer instructions, and the computer instructions are stored in a computer readable storage medium. The processor of the electronic device reads the computer instruction from the computer readable storage medium, and the processor executes the computer instruction, so that the electronic device executes the switching power supply charging and discharging soft switching method.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (10)
1. A switching power supply charging and discharging soft switching method based on a bidirectional LLC resonant converter is characterized in that the switching power supply charging and discharging soft switching method comprises an LLC resonant circuit, a primary side bridge type switch set arranged on a primary side of the LLC resonant circuit and a secondary side bridge type switch set arranged on a secondary side of the LLC resonant circuit, and comprises a charging mode and a discharging mode, and comprises the following steps:
judging the current working mode of the switching power supply;
in the charging mode and the discharging mode, controlling the driving duty ratio of the primary side bridge type switch group to be a preset first target value;
in the charging mode, judging whether the driving duty ratio of the secondary bridge type switch group reaches a preset second target value, wherein the second target value is smaller than the first target value, if not, controlling the driving duty ratio of the secondary bridge type switch group to be continuously adjusted to the second target value at a preset speed, and controlling the driving duty ratio of the secondary bridge type switch group to be kept at the second target value;
and in the discharging mode, judging whether the driving duty ratio of the secondary bridge type switch group reaches the first target value, if not, controlling the driving duty ratio of the secondary bridge type switch group to be continuously adjusted to the first target value at a preset speed, and keeping the driving duty ratio of the secondary bridge type switch group at the first target value.
2. The method according to claim 1, wherein in the charging mode, the second target value is a variation interval, duty ratios with different magnitudes in the variation interval correspond to operating frequencies of the secondary bridge switch sets, and the driving duty ratios of the secondary bridge switch sets are controlled to dynamically vary along with the operating frequencies of the secondary bridge switch sets in the variation interval.
3. The method according to claim 1, wherein the method for determining the operating mode of the switching power supply comprises:
and judging whether the current is greater than or equal to a first preset current, if so, enabling the switching power supply to be in the charging mode, and if not, enabling the switching power supply to be in the discharging mode.
4. The method according to claim 3, wherein the method for determining the operating mode of the switching power supply further comprises:
if the current is smaller than the first preset current, judging whether the current is smaller than or equal to a second preset current again, wherein the second preset current is smaller than the first preset current, if so, the switching power supply is in the discharging mode, and if not, the switching power supply is judged to be kept in the current working state.
5. The method according to claim 2, wherein the first target value is 50% and the variation interval is [ 35%, 41% ].
6. A switch power supply charge-discharge soft switching system based on a bidirectional LLC resonant converter is disclosed, wherein the switch power supply comprises an LLC resonant circuit, a primary side bridge type switch group arranged on the primary side of the LLC resonant circuit and a secondary side bridge type switch group arranged on the secondary side of the LLC resonant circuit, and the switch power supply comprises a charging mode and a discharging mode;
the working mode judging module is used for judging the current working mode of the switching power supply;
the charging driving adjustment module is used for continuously adjusting the driving duty ratio of the secondary side bridge switch group to a second target value at a preset rate in the charging mode, and controlling the driving duty ratio of the primary side bridge switch group to be a preset first target value, wherein the second target value is smaller than the first target value;
and the discharge driving adjustment module is used for continuously adjusting the driving duty ratio of the secondary bridge type switch group to a second target value at a preset speed in the discharge mode, controlling the driving duty ratio of the secondary bridge type switch group to be continuously adjusted to the first target value at the preset speed, and keeping the driving duty ratio of the secondary bridge type switch group at the first target value.
7. The system according to claim 6, wherein in the charging mode, the second target value is a variation interval, duty ratios with different magnitudes in the variation interval correspond to operating frequencies of the secondary bridge switch sets, and the charging driving adjustment module controls driving duty ratios of the secondary bridge switch sets to dynamically vary along with the operating frequencies of the secondary bridge switch sets in the variation interval.
8. The system according to claim 6, wherein the operating mode determining module comprises a first determining module and a second determining module, the first determining module is configured to determine whether a current is greater than or equal to a first preset current, if so, the switching power supply is in the charging mode, and if not, the switching power supply is in the discharging mode; the second judging module is used for judging whether the current is smaller than or equal to a second preset current when the current is smaller than the first preset current, the second preset current is smaller than the first preset current, if so, the switching power supply is in the discharging mode, and if not, the switching power supply is judged to be kept in the current working state.
9. A soft switching system for charging and discharging of a switching power supply is characterized by comprising:
one or more processors;
a memory;
and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs comprising instructions for performing the bidirectional LLC resonant converter-based switching power supply charging and discharging soft-switching method according to any one of claims 1 to 5.
10. A computer readable storage medium comprising a computer program executable by a processor to perform the method of any of claims 1 to 5 for charge-discharge soft-switching of a bidirectional LLC resonant converter based switching power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210134960.1A CN114696623A (en) | 2022-02-14 | 2022-02-14 | Soft switching method and system for charging and discharging of switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210134960.1A CN114696623A (en) | 2022-02-14 | 2022-02-14 | Soft switching method and system for charging and discharging of switching power supply |
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| CN202210134960.1A Pending CN114696623A (en) | 2022-02-14 | 2022-02-14 | Soft switching method and system for charging and discharging of switching power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116155117A (en) * | 2023-04-20 | 2023-05-23 | 西安图为电气技术有限公司 | Bidirectional LLC resonant circuit, design method and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116155117A (en) * | 2023-04-20 | 2023-05-23 | 西安图为电气技术有限公司 | Bidirectional LLC resonant circuit, design method and electronic equipment |
| CN116155117B (en) * | 2023-04-20 | 2023-06-23 | 西安图为电气技术有限公司 | Bidirectional LLC resonant circuit, design method and electronic equipment |
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