CN107517006A - A kind of LLC resonant converter with mixing control and overcurrent protection measure - Google Patents
A kind of LLC resonant converter with mixing control and overcurrent protection measure Download PDFInfo
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- CN107517006A CN107517006A CN201710873514.1A CN201710873514A CN107517006A CN 107517006 A CN107517006 A CN 107517006A CN 201710873514 A CN201710873514 A CN 201710873514A CN 107517006 A CN107517006 A CN 107517006A
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Classifications
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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
- H02M3/33569—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 several active switching elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of LLC resonant converter with mixing control and overcurrent protection measure, it includes power supply A, power supply A is just, the negative pole source electrode with first switch pipe Q1 respectively, second switch pipe Q2 drain electrode is connected, first switch pipe Q1 drain electrode and second switch pipe Q2 source electrode are connected with the input of resonance circuit respectively, the output end of resonance circuit and power supply A negative pole are connected with the input of transformer respectively, the output end of transformer passes through rectifier and load parallel connection, the input of control circuit is respectively by detecting circuit, voltage comparator circuit and resonance circuit, load is connected, the output end of control circuit respectively with first switch pipe Q1, second switch pipe Q2 grid is connected.The present invention, which realizes LLC resonant converter and automatically switches PWM or PFM according to load change, mixes control model, improve its underloading or it is unloaded when operating efficiency, overload or it is short-circuit when overcurrent protection and startup when dash current limitation.
Description
Technical field
The invention belongs to electronic circuit technology field, and in particular to a kind of to have mixing control and overcurrent protection measure
LLC resonant converter.
Background technology
Modularization, miniaturization, high frequency, high efficiency, high power density have become the research and development of Switching Power Supply in recent years
Trend, traditional Switching Power Supply topological sum control method can not meet, be arisen at the historic moment for this soft switch technique.Resonant transformation
Device utilizes the principle of resonance, the switching tube curtage of switch converters is converted according to sinusoidal or quasi sine rule, when
Switching tube is turned off during electric current natural zero-crossing, or makes switching tube open-minded when voltage is zero, so that switching tube loss reduces
To close to zero.So as to realize reduction switching loss, the purpose of switch converters efficiency is improved.
The advantages of LLC resonant converter, includes：
(1) there is ZVS functions in zero to full-load range, and MOSFET cut-off currents are low, turn-off power loss is low,
(2) there is high efficiency under high input voltage, optimized design can be carried out to converter in normal working conditions,
(3) converter is secondary does not have filter inductance, exports that the voltage stress of commutation diode is low, can be reduced to twice defeated
Go out voltage,
(4) becoming the magnetic device of device can easily be integrated on a magnetic core.And magnetizing inductance and the leakage of transformer
Sense can be also utilized.
But due to LLC resonant converter using frequency conversion PFM control, underloading and it is unloaded when for output voltage not
Become, switch converters necessarily be in BUCK patterns, and the frequency of switching tube now is very high, and the equiva lent impedance of primary side is very big, makes
Efficiency into switch converters is very low.
Overload and short circuit in the case of, dutycycle can limit electric current, LLC during different from traditional pwm converter excessively stream
Resonance cavity impedance is minimum when controlled resonant converter is operated in resonant frequency, may be very which results in the electric current of resonator during short circuit
The short time reaches very high.
The content of the invention
According to above the deficiencies in the prior art, the technical problems to be solved by the invention are to propose that one kind has mixing control
With the LLC resonant converter of overcurrent protection measure, by detecting circuit, voltage comparator circuit and control circuit, solve light
LLC resonant converter efficiency is very low when carrying and be unloaded and is overloading the cavity current with LLC resonant converter under short-circuit conditions
Reach the problem of very high in the very short time, have and realize that the control circuit for changing LLC resonant converter according to load is automatic
The control mode of operation that switching is mixed using PWM or PFM, improve LLC resonant converter underloading or it is unloaded when work effect
Rate and overload or it is short-circuit when LLC resonant converter electric current overcurrent protection and startup when dash current limitation.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of LLC resonant converter with mixing control and overcurrent protection measure provided by the invention, it includes power supply
A, in addition to first switch pipe Q1, second switch pipe Q2, resonance circuit, transformer, rectifier, load, detection circuit, voltage ratio
Compared with circuit and control circuit, the positive and negative electrode of the power supply A source electrode with the first switch pipe Q1, second switch pipe Q2 respectively
Drain electrode be connected, the first switch pipe Q1 drain electrode and the second switch pipe Q2 source electrode respectively with the resonance circuit
Electrode input end be connected, the cathode output end of the resonance circuit and power supply A negative pole respectively with the transformer
Input be connected, the output end of the transformer passes through the rectifier and the load parallel connection, the control electricity
The input on road is connected by the detection circuit, voltage comparator circuit with the resonance circuit, load respectively, the control
Grid of the output end of circuit respectively with the first switch pipe Q1, second switch pipe Q2 is connected.
Further, the detection circuit includes voltage detecting circuit and current detection circuit, the voltage detecting circuit
It is connected between the load and the control circuit, the current detection circuit includes resonance electric current detection circuit and load electricity
Current detection circuit, the resonance electric current detection circuit are connected between the resonance circuit and the control circuit, the load
Current detection circuit is connected between the load and the control circuit.
Further, the resonance circuit includes the resonant capacitance Cr and equivalent inductance Lr being sequentially connected in series, the transformer
Including magnetizing inductance Lm and transformer body, the magnetizing inductance Lm and the transformer body input are connected in parallel, institute
Stating load includes output capacitance C0 and load resistance R0, and the output capacitance C0 is connected in parallel with the load resistance R0.
Further, the control circuit includes micro-control unit MCU and control information output module, the microcontroller list
First MCU includes AD acquisition modules, PI adjustment modules, PWM module and PFM modules, the inputs of the AD acquisition modules respectively with
The output end of the resonance electric current detection circuit, the output end of load current detection circuit, the output end phase of voltage detecting circuit
Connection, the input of the PI adjustment modules are connected with the voltage comparator circuit output end, the PWM module and PFM moulds
Input of the output end of block respectively with the control information output module is connected, the output of the control information output module
The grid respectively with the first switch pipe Q1, second switch pipe Q2 is held to be connected.
Further, the voltage comparator circuit includes current transformer T1, bridge-type uncontrollable rectifier device LN and comparator LM,
Input CT+, CT- of current transformer T1 connections corresponding with the both positive and negative polarity of the load resistance R0 respectively, the electric current
Transformer T1 output end is connected with the input of the bridge-type uncontrollable rectifier device LN, and the bridge-type uncontrollable rectifier device LN's is defeated
Go out end respectively by output capacitance C2, resistance Req with the inverting input of the comparator LM to be connected, the comparator LM's
Normal phase input end passes sequentially through output capacitance C1, output resistance R2, output resistance R1 and is connected with power supply VCC, the comparator
LM output ends pass sequentially through output resistance R4, output resistance R5, output capacitance C4 and are connected with the input of the PI adjustment modules
Connect.
Further, between the output end of the bridge-type uncontrollable rectifier device LN and the inverting input of the comparator LM also
Output resistance R3 and output capacitance C3 are connected with turn, for being filtered processing to output voltage.
Further, the first switch pipe Q1, second switch pipe Q2 are n-channel MOSFET switch pipe, the transformation
Device is the centre-tapped transformer of secondary equal turn numbers.
Present invention has the advantages that:By detecting circuit, voltage comparator circuit and control circuit, solve in underloading and sky
LLC resonant converter efficiency is very low during load and is overloading the cavity current with LLC resonant converter under short-circuit conditions very short
Time reach the problem of very high, realize and changed according to load, the control circuit of LLC resonant converter automatically switches use
PWM or PFM mixing control mode of operation, improve LLC resonant converter underloading or it is unloaded when operating efficiency and
The limitation of dash current when overloading or be short-circuit when the overcurrent protection and startup of LLC resonant converter electric current.In addition, this hair
Bright circuit connection is simple, integrates easy to control, service life length.
Brief description of the drawings
The content expressed by this specification accompanying drawing and the mark in figure are briefly described below：
Fig. 1 is the LLC resonant converter with mixing control and overcurrent protection measure of the embodiment of the present invention
Control block diagram.
Fig. 2 is the LLC resonant converter with mixing control and overcurrent protection measure of the embodiment of the present invention
Mixing control and overcurrent protection measure algorithm block diagram.
Fig. 3 is the LLC resonant converter with mixing control and overcurrent protection measure of the specific embodiment of the invention
The hardware circuit diagram of overcurrent protection.
Fig. 4 is LnWhen constant, the output gain curve map under different quality factor and switching frequency.
Embodiment
Below against accompanying drawing, by the description to embodiment, for example involved each component of embodiment of the invention
Shape, construction, the mutual alignment and annexation between each several part, the effect of each several part and operation principle, manufacturing process and
Operate with method etc., is described in further detail, to help those skilled in the art to inventive concept of the invention, technology
Scheme has more complete, accurate and deep understanding.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
Under traditional PFM control the voltage gain of LLC resonant converter when circuit parameter determines only by derailing switch
The influence of the switching frequency of part, expression formula are as follows：
L in formulanFor resonant inductance and the ratio of transformer leakage inductance, fnTo normalize switching frequency, Q is quality factor.
It can obtain accordingly in LnWhen constant, the output gain curve under different quality factor and switching frequency, such as Fig. 4 institutes
Show.
It can be seen that when being Q larger in underloading, input voltage is constant, constant for maintenance output voltage, now fnIt is remote
The efficiency of LLC resonant converter can be caused very low from 1.So introduce PWM and PFM mixing control methods, the voltage gain of output
Expression formula is as follows：
Wherein, tdFor the ON time of switching device, TsFor the cycle time of switching device.
It can thus be concluded that open frequency it is constant under conditions of, with the increase of dutycycle, output gain is also increasing.
It is theoretical based on more than, the LLC resonant converter with mixing control and overcurrent protection measure provided by the invention, its
Including power supply A, in addition to first switch pipe Q1, second switch pipe Q2, resonance circuit, transformer, rectifier, load, detection electricity
Road, voltage comparator circuit and control circuit, power supply A the positive and negative electrode source electrode with first switch pipe Q1, second switch pipe Q2 respectively
Drain electrode be connected, first switch pipe Q1 drain electrode and second switch pipe Q2 the source electrode electrode input end with resonance circuit respectively
Be connected, the cathode output end of resonance circuit and power supply A negative pole are connected with the input of transformer respectively, transformer it is defeated
Go out end and pass through rectifier and load parallel connection, the input of control circuit respectively by detect circuit, voltage comparator circuit and
Resonance circuit, load are connected, and the grid of the output end of control circuit respectively with first switch pipe Q1, second switch pipe Q2 is connected
Connect.
The present invention by detecting circuit, voltage comparator circuit and control circuit, solve underloading and it is unloaded when LLC resonance
Transducer effciency is very low and reaches very in the very short time with the cavity current of LLC resonant converter under short-circuit conditions overloading
The problem of high, realize and changed according to load, the control circuit of LLC resonant converter automatically switches is mixed using PWM or PFM
The control mode of operation of conjunction, improve LLC resonant converter underloading or it is unloaded when operating efficiency and overload or short circuit
When LLC resonant converter electric current overcurrent protection and startup when dash current limitation.In addition, circuit connection letter of the present invention
It is single, integrate easy to control, service life length.
Specifically, detection circuit includes voltage detecting circuit and current detection circuit, and voltage detecting circuit is connected to load
Between control circuit, current detection circuit includes resonance electric current detection circuit and load current detection circuit, resonance current inspection
Slowdown monitoring circuit is connected between resonance circuit and control circuit, and load current detection circuit is connected between load and control circuit.
Specifically, resonance circuit includes the resonant capacitance Cr and equivalent inductance Lr being sequentially connected in series, and transformer includes excitation electricity
Feel Lm and transformer body, the input of magnetizing inductance Lm and transformer body is connected in parallel, load include output capacitance C0 with
Load resistance R0, output capacitance C0 are connected in parallel with load resistance R0.
Specifically, control circuit includes micro-control unit MCU and control information output module, and micro-control unit MCU includes
AD acquisition modules, PI adjustment modules, PWM module and PFM modules, the input of AD acquisition modules detect electricity with resonance current respectively
The output end on road, the output end of load current detection circuit, the output end of voltage detecting circuit are connected, PI adjustment modules it is defeated
Enter end with voltage comparator circuit output end to be connected, the output end of PWM module and PFM modules respectively with control information output module
Input be connected, the output end of control information output module respectively with first switch pipe Q1, second switch pipe Q2 grid
It is connected.
Specifically, voltage comparator circuit includes current transformer T1, bridge-type uncontrollable rectifier device LN and comparator LM, electric current are mutual
Sensor T1 input CT+, CT- respectively it is corresponding with load resistance R0 both positive and negative polarity connection, current transformer T1 output end with
Bridge-type uncontrollable rectifier device LN input is connected, and bridge-type uncontrollable rectifier device LN output end passes through output capacitance C2, electricity respectively
Resistance Req is connected with comparator LM inverting input, and comparator LM normal phase input end passes sequentially through output capacitance C1, output
Resistance R2, output resistance R1 are connected with power supply VCC, comparator LM output ends pass sequentially through output resistance R4, output resistance R5,
Output capacitance C4 is connected with the input of PI adjustment modules.Preferably, bridge-type uncontrollable rectifier device LN output end and comparator
Output resistance R3 and output capacitance C3 are also connected between LM inverting input in turn, for being filtered place to output voltage
Reason.In the present invention, as can be known from Fig. 3Wherein CT+, CT- are connected on the secondary side of LLC resonant converter,
By current transformer T1 and bridge-type uncontrollable rectifier device LN, the ac current signal in current signal is converted into DC current letter
Number, and current signal is converted into by C3 pairs of voltage signal, output resistance R3 and output capacitance by output capacitance C2 and resistance Req
Output voltage is filtered processing, VoutWith VrefCompare, if VoutLess than Vref, comparator LM output high level, by output electricity
The PI adjustment modules that resistance R4, output resistance R5, output capacitance C4 output filtering are passed the signal along in MCU；If VoutMore than Vref,
Comparator exports low level, and OCP moments can be pulled low, now MCU also can snap action, until VoutLess than Vref, OCP can be
High level, release overcurrent protection.
Preferably, in the present invention, first switch pipe Q1, second switch pipe Q2 are n-channel MOSFET switch pipe, transformer
For the centre-tapped transformer of secondary equal turn numbers.
Specific implementation is as follows：During beginning, PFM module output switching signals, until reaching preset value, PWM module dutycycle
Gradually increase makes the output of LLC resonance circuits complete system soft start, during this period AD acquisition modules until reaching systemic presupposition value
Timing carries out sampling by voltage detecting circuit and judges whether to reach preset value, simultaneously to the output voltage of LLC resonant converter
Sampling is timed by load current detection circuit and resonance electric current detection circuit respectively to output current resonant cavity electric current,
Output loading situation is judged by the numerical value of output voltage and output current, if the output calculated by output voltage and output current
Resistance is larger, or approach infinity, then is judged to underloading or open circuit.If output resistance is smaller, or close to zero, is then judged to
Overload or short circuit.If output resistance is normal, normal operation mode is judged to.
System passes through voltage comparator circuit and setting a reference value ratio if normal mode, the voltage of AD acquisition modules collection
Compared with error is amplified to PI compensators, and PFM module output signals give control information output module driving power switching tube Q1, Q2.
System is if underloading or open circuit mode, and in order to maintain the constant of output voltage, switching frequency keeps constant, now
The efficiency highest of LLC resonant converter, the dutycycle of switching signal is reduced until reaching preset value, judge output in the process
Whether voltage meets scope, and if meeting compared with output voltage a reference value, PWM waveform is exported to control by PI compensators
Message output module driving power switching tube Q1, Q2；If voltage, which can not still arrive, it is expected voltage, now change switching frequency output again
PWM gives control information output module driving power switching tube Q1, Q2 with PFM hybrid waveforms.
When system is if overload and short-circuit mode, switching frequency rapidly rises to preset value so that LLC resonant converter work
Make in BUCK patterns, resonance electric current detection circuit detects the electric current of resonator, if excessive but still less than VrefA reference value, now
PWM module reduces electric current in output voltage resonant cavity by reducing dutycycle.If electric current is still larger than Vref, then PFM
No longer worked with PWM module, system closedown, so as to realize the overcurrent protection to LLC resonant converter.
The present invention is exemplarily described above in conjunction with accompanying drawing, it is clear that present invention specific implementation is not by aforesaid way
Limitation, as long as the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress is employed, or without changing
Enter and the design of the present invention and technical scheme are directly applied into other occasions, within protection scope of the present invention.This hair
Bright protection domain should be determined by the scope of protection defined in the claims.
Claims (7)
1. a kind of LLC resonant converter with mixing control and overcurrent protection measure, including power supply A, it is characterised in that also wrap
Include first switch pipe Q1, second switch pipe Q2, resonance circuit, transformer, rectifier, load, detection circuit, voltage comparator circuit
And control circuit, the positive and negative electrode drain electrode with the source electrode, second switch pipe Q2 of the first switch pipe Q1 respectively of the power supply A
It is connected, the drain electrode of the first switch pipe Q1 and the source electrode positive pole with the resonance circuit respectively of the second switch pipe Q2
Input is connected, the cathode output end of the resonance circuit and the power supply A negative pole input with the transformer respectively
End is connected, the output end of the transformer by the rectifier and the load parallel connection, the control circuit it is defeated
Enter end respectively by the detection circuit, voltage comparator circuit with the resonance circuit, load to be connected, the control circuit
Grid of the output end respectively with the first switch pipe Q1, second switch pipe Q2 is connected.
2. the LLC resonant converter with mixing control and overcurrent protection measure as claimed in claim 1, it is characterised in that
The detection circuit includes voltage detecting circuit and current detection circuit, and the voltage detecting circuit is connected to the load and institute
Between stating control circuit, the current detection circuit includes resonance electric current detection circuit and load current detection circuit, described humorous
The current detection circuit that shakes is connected between the resonance circuit and the control circuit, and the load current detection circuit is connected to
Between the load and the control circuit.
3. the LLC resonant converter with mixing control and overcurrent protection measure as claimed in claim 1 or 2, its feature exist
In the resonance circuit includes the resonant capacitance Cr and equivalent inductance Lr being sequentially connected in series, and the transformer includes magnetizing inductance Lm
And transformer body, the magnetizing inductance Lm and the transformer body input are connected in parallel, the load includes output
Electric capacity C0 and load resistance R0, the output capacitance C0 are connected in parallel with the load resistance R0.
4. the LLC resonant converter with mixing control and overcurrent protection measure as claimed in claim 3, it is characterised in that
The control circuit includes micro-control unit MCU and control information output module, and the micro-control unit MCU includes AD collection moulds
Block, PI adjustment modules, PWM module and PFM modules, the input of the AD acquisition modules detect electricity with the resonance current respectively
The output end on road, the output end of load current detection circuit, the output end of voltage detecting circuit are connected, the PI adjustment modules
Input be connected with the voltage comparator circuit output end, the output end of the PWM module and PFM modules respectively with it is described
The input of control information output module is connected, the output end of the control information output module respectively with the first switch
Pipe Q1, second switch pipe Q2 grid are connected.
5. the LLC resonant converter with mixing control and overcurrent protection measure as described in claim 1 or 4, its feature exist
In the voltage comparator circuit includes current transformer T1, bridge-type uncontrollable rectifier device LN and comparator LM, the current transformer
T1 input CT+, CT- connections corresponding with the both positive and negative polarity of the load resistance R0 respectively, the output of the current transformer T1
End is connected with the input of the bridge-type uncontrollable rectifier device LN, and the output end of the bridge-type uncontrollable rectifier device LN is respectively by defeated
The inverting input for going out electric capacity C2, resistance Req with the comparator LM is connected, and the normal phase input end of the comparator LM is successively
It is connected by output capacitance C1, output resistance R2, output resistance R1 with power supply VCC, the comparator LM output ends are led to successively
Output resistance R4, output resistance R5, output capacitance C4 is crossed with the input of the PI adjustment modules to be connected.
6. the LLC resonant converter with mixing control and overcurrent protection measure as claimed in claim 5, it is characterised in that
Also it is connected with output electricity between the output end of the bridge-type uncontrollable rectifier device LN and the inverting input of the comparator LM in turn
R3 and output capacitance C3 is hindered, for being filtered processing to output voltage.
7. the LLC resonant converter with mixing control and overcurrent protection measure as claimed in claim 1, it is characterised in that
The first switch pipe Q1, second switch pipe Q2 are n-channel MOSFET switch pipe, and the transformer is secondary equal turn numbers
Centre-tapped transformer.
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| CN115514194A (en) * | 2022-11-24 | 2022-12-23 | 成都市易冲半导体有限公司 | Load resistance value determining method and device, electronic equipment and storage medium |
| CN117394672A (en) * | 2023-12-11 | 2024-01-12 | 苏州博创集成电路设计有限公司 | Soft start control circuit, chip and control method of resonant converter |
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| CN203387407U (en) * | 2013-07-17 | 2014-01-08 | 潘海铭 | LLC resonant converter light load control device |
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Cited By (11)
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| CN111869079B (en) * | 2018-02-12 | 2024-04-02 | 阿帕尔斯电力股份有限公司 | Switch type power supply controller with multi-mode starting function |
| CN108242891A (en) * | 2018-03-20 | 2018-07-03 | 山东大学 | A kind of PWM and PFM hybrid control system and method that two-way DC/DC is isolated |
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| US11870357B2 (en) | 2018-04-26 | 2024-01-09 | Byd Company Limited | Dc-dc converter, on-board charger, and electric vehicle |
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| CN113708627A (en) * | 2021-07-26 | 2021-11-26 | 苏州浪潮智能科技有限公司 | Resonant converter |
| CN115514194A (en) * | 2022-11-24 | 2022-12-23 | 成都市易冲半导体有限公司 | Load resistance value determining method and device, electronic equipment and storage medium |
| CN115514194B (en) * | 2022-11-24 | 2023-02-28 | 成都市易冲半导体有限公司 | Load resistance value determining method and device, electronic equipment and storage medium |
| CN117394672A (en) * | 2023-12-11 | 2024-01-12 | 苏州博创集成电路设计有限公司 | Soft start control circuit, chip and control method of resonant converter |
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