CN107070240A - A kind of Switching Power Supply LLC series resonances translation circuit control device and method - Google Patents
A kind of Switching Power Supply LLC series resonances translation circuit control device and method Download PDFInfo
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- CN107070240A CN107070240A CN201710335274.XA CN201710335274A CN107070240A CN 107070240 A CN107070240 A CN 107070240A CN 201710335274 A CN201710335274 A CN 201710335274A CN 107070240 A CN107070240 A CN 107070240A
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- Prior art keywords
- llc
- voltage
- control
- threshold voltage
- frequency
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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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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 present invention discloses a kind of Switching Power Supply LLC series resonances translation circuit control device and method, including：Loop voltage detection module：Loop voltage for detection switch power supply；LLC frequency control modules：Loop voltage value for being detected according to loop power detection module controls the switching frequency of LLC series resonance translation circuit switching tubes；LLC mode control modules：Loop voltage value for being detected according to loop power detection module controls the mode of operation of LLC series resonance translation circuits.Under the conditions of unloaded and underloading, the problem of switching frequency is too high, the stabilization of output voltage when being conducive to underloading, and realize simple, circuit is smooth when switch between different control modes, it is ensured that the reliability that circuit works.
Description
Technical field
The present invention relates to Switching Power Supply control field, and in particular to a kind of Switching Power Supply LLC series resonances translation circuit control
Device and method processed.
Background technology
Now with developing rapidly for switch power technology, high-power, high efficiency, high power density have become switch electricity
A kind of development trend in source.And it is a kind of effective solution to improve switching frequency, but switching frequency rise is brought
The problem of switching tube loss is excessive, this is that traditional BUCK converters are insurmountable, and this controlled resonant converter then can be preferable
This problem is solved, therefore the application of resonant transform circuit obtains extensive research and concern.LLC series resonances translation circuit is made
For a kind of special circuit topology, the requirement of high frequency can either be met, higher conversion efficiency can be reached again, by industry
It is widely used.
LLC series resonances translation circuit adjusts output voltage by changing the switching frequency of resonance circuit switching tube, but
Simple VFC can cause operating frequency range wide or even fail, and bring magnetic element to be difficult to design, circuit loss mistake
Greatly and feedback control be difficult to design the problem of.
The content of the invention
To solve the above problems, the present invention provides a kind of control device and method of the small load switching frequencies of reduction LLC.
The technical scheme is that：A kind of Switching Power Supply LLC series resonances translation circuit control device, including：
Loop voltage detection module：Loop voltage for detection switch power supply；
LLC frequency control modules：Loop voltage value for being detected according to loop power detection module controls LLC series resonances
The switching frequency of translation circuit switching tube；
LLC mode control modules：Loop voltage value for being detected according to loop power detection module controls LLC series resonances
The mode of operation of translation circuit.
Further, the mode of operation of the LLC series resonances translation circuit includes：PWM mode of operations, PFW Working moulds
Formula, PFM+PWM operational modules.
Further, when loop voltage detection module detects loop voltage in first threshold voltage and second threshold voltage
Between when, LLC frequency control modules control LLC series resonance translation circuit switching tubes switching frequency be highest switching frequency,
LLC mode control modules control LLC series resonance translation circuits are operated in PWM mode；
When loop voltage detection module detects loop voltage between second threshold voltage and the 3rd threshold voltage, LLC frequencies
Rate control module controls the switching frequency of LLC series resonance translation circuit switching tubes to be first threshold switching frequency, LLC pattern controls
Molding block control LLC series resonance translation circuits are operated in PFM+PWM operational modules；
When loop voltage detection module detects loop voltage between the 3rd threshold voltage and the 4th threshold voltage, LLC frequencies
Rate control module controls the switching frequency of LLC series resonance translation circuit switching tubes to be lowermost switch frequency, LLC Schema control moulds
Block control LLC series resonance translation circuits are operated in PFM operational modules；
The frequency values of first threshold switching frequency are between highest switching frequency and lowermost switch frequency；
First threshold voltage, second threshold voltage, the 3rd threshold voltage and the 4th threshold voltage magnitude of voltage it is incremented by successively.
A kind of Switching Power Supply LLC series resonances translation circuit control method, including following operation：
The loop voltage of detection switch voltage；
When loop voltage is between first threshold voltage and second threshold voltage, control LLC series resonances translation circuit switch
The switching frequency of pipe is highest switching frequency, and control LLC series resonance translation circuits are operated in PWM mode；
When loop voltage is between second threshold voltage and the 3rd threshold voltage, control LLC series resonances translation circuit switch
The switching frequency of pipe is first threshold switching frequency, and control LLC series resonance translation circuits are operated in PFM+PWM operational modules；
When loop voltage is between the 3rd threshold voltage and the 4th threshold voltage, control LLC series resonances translation circuit switch
The switching frequency of pipe is lowermost switch frequency, and control LLC series resonance translation circuits are operated in PFM operational modules.
Further, the frequency values of described first threshold switching frequency highest switching frequency and lowermost switch frequency it
Between；
First threshold voltage, second threshold voltage, the 3rd threshold voltage and the 4th threshold voltage magnitude of voltage it is incremented by successively.
The Switching Power Supply LLC series resonance translation circuit control device and methods that the present invention is provided, by changing resonance electricity
The switching frequency regulation output voltage of way switch pipe, the switch is adjusted according to the load circuit feedback signal of reflection load condition
The dutycycle of pipe so that the voltage range extension of resonance circuit.When load is heavy duty, the work of LLC series resonances translation circuit
In PFM mode of operations；When load is underloading, LLC series resonance translation circuits are operated in PFM+PWM mode of operations；When negative
When carrying as zero load, LLC series resonance translation circuits are operated in PWM mode of operations.Avoided using the control method unloaded and light
Under the conditions of load, the problem of switching frequency is too high, the stabilization of output voltage when being conducive to underloading.The control mode realizes simple, electricity
Road is smooth when switching between different control modes, it is ensured that the reliability of circuit work.
Brief description of the drawings
Fig. 1 is specific embodiment of the invention LLC topology PWM/PFW operation principle schematic diagrams.
Embodiment
Below in conjunction with the accompanying drawings and the present invention will be described in detail by specific embodiment, following examples are to the present invention
Explanation, and the invention is not limited in implementation below.
The Switching Power Supply LLC series resonance translation circuit control devices that the present invention is provided, including：
Loop voltage detection module：Loop voltage for detection switch power supply；
LLC frequency control modules：Loop voltage value for being detected according to loop power detection module controls LLC series resonances
The switching frequency of translation circuit switching tube；
LLC mode control modules：Loop voltage value for being detected according to loop power detection module controls LLC series resonances
The mode of operation of translation circuit.
The mode of operation of LLC series resonance translation circuits includes：PWM mode of operations, PFW mode of operations, PFM+PWM work
Module.
When loop voltage detection module detects loop voltage between first threshold voltage and second threshold voltage,
LLC frequency control modules control the switching frequency of LLC series resonance translation circuit switching tubes to be highest switching frequency, LLC patterns
Control module control LLC series resonance translation circuits are operated in PWM mode.
When loop voltage detection module detects loop voltage between second threshold voltage and the 3rd threshold voltage,
LLC frequency control modules control the switching frequency of LLC series resonance translation circuit switching tubes to be first threshold switching frequency, LLC
Mode control module control LLC series resonance translation circuits are operated in PFM+PWM operational modules.
When loop voltage detection module detects loop voltage between the 3rd threshold voltage and the 4th threshold voltage,
LLC frequency control modules control the switching frequency of LLC series resonance translation circuit switching tubes to be lowermost switch frequency, LLC patterns
Control module control LLC series resonance translation circuits are operated in PFM operational modules.
Wherein, the frequency values of first threshold switching frequency are between highest switching frequency and lowermost switch frequency, the first threshold
Threshold voltage, second threshold voltage, the 3rd threshold voltage and the 4th threshold voltage magnitude of voltage it is incremented by successively.
The Switching Power Supply LLC series resonance translation circuit control methods that the present invention is provided, including following operation：
The loop voltage of detection switch voltage；
When loop voltage is between first threshold voltage and second threshold voltage, control LLC series resonances translation circuit switch
The switching frequency of pipe is highest switching frequency, and control LLC series resonance translation circuits are operated in PWM mode；
When loop voltage is between second threshold voltage and the 3rd threshold voltage, control LLC series resonances translation circuit switch
The switching frequency of pipe is first threshold switching frequency, and control LLC series resonance translation circuits are operated in PFM+PWM operational modules；
When loop voltage is between the 3rd threshold voltage and the 4th threshold voltage, control LLC series resonances translation circuit switch
The switching frequency of pipe is lowermost switch frequency, and control LLC series resonance translation circuits are operated in PFM operational modules.
Wherein, the frequency values of first threshold switching frequency are between highest switching frequency and lowermost switch frequency；First threshold
Threshold voltage, second threshold voltage, the 3rd threshold voltage and the 4th threshold voltage magnitude of voltage it is incremented by successively.
As shown in figure 1, the operation principle of the present apparatus and method is as follows：
A) when loop voltage Vloop changes from 0V-aV, dutycycle D is 0, no output；
B) when loop voltage Vloop changes from aV-bV, control frequency f is constant, is f=fmax, dutycycle D is changed to from 0%
D0；Load output changes to V1 from 0V；This stage mode of operation is PWM；
C) when loop voltage Vloop changes from bV-cV, control frequency f and dutycycle D changes simultaneously：Dutycycle D changes from D0
To 50% full pulsewidth, output voltage is caused to continue to rise；Meanwhile, control frequency f is also reduced to f0 from fmax, and the change also causes
The rising of output voltage；When loop voltage Vloop rises to cV, dutycycle D reaches the full pulsewidth of maximum 50%, output voltage
Rise to V2；This stage mode of operation is PWM+PFM
D) when loop voltage Vloop changes from cV-dV, dutycycle D is constant, and control frequency f drops to fmin, output electricity from f0
Pressure continues to rise, until during f=fmin, output voltage is V3；This stage mode of operation is PFM.
Wherein frequency f refers to the switching frequency of LLC series resonance translation circuit switching tubes, and dutycycle refers to that LLC series connection is humorous
Shake the dutycycle of translation circuit switching tube.
Under the conditions of unloaded and underloading being avoided using the control method, the problem of switching frequency is too high, when being conducive to underloading
The stabilization of output voltage.The control mode realizes that simply circuit is smooth when switching between different control modes, it is ensured that
The reliability of circuit work.
Disclosed above is only the preferred embodiment of the present invention, but the present invention is not limited to this, any this area
What technical staff can think does not have a creative change, and some improvement made without departing from the principles of the present invention and
Retouching, should all be within the scope of the present invention.
Claims (5)
1. a kind of Switching Power Supply LLC series resonances translation circuit control device, it is characterised in that including：
Loop voltage detection module：Loop voltage for detection switch power supply；
LLC frequency control modules：Loop voltage value for being detected according to loop power detection module controls LLC series resonances
The switching frequency of translation circuit switching tube；
LLC mode control modules：Loop voltage value for being detected according to loop power detection module controls LLC series resonances
The mode of operation of translation circuit.
2. Switching Power Supply LLC series resonances translation circuit control device according to claim 1, it is characterised in that described
The mode of operation of LLC series resonance translation circuits includes：PWM mode of operations, PFW mode of operations, PFM+PWM operational modules.
3. Switching Power Supply LLC series resonances translation circuit control device according to claim 2, it is characterised in that work as ring
When road voltage detection module detects loop voltage between first threshold voltage and second threshold voltage, LLC FREQUENCY CONTROL moulds
Block controls the switching frequency of LLC series resonance translation circuit switching tubes to be highest switching frequency, the control of LLC mode control modules
LLC series resonance translation circuits are operated in PWM mode；
When loop voltage detection module detects loop voltage between second threshold voltage and the 3rd threshold voltage, LLC frequencies
Rate control module controls the switching frequency of LLC series resonance translation circuit switching tubes to be first threshold switching frequency, LLC pattern controls
Molding block control LLC series resonance translation circuits are operated in PFM+PWM operational modules；
When loop voltage detection module detects loop voltage between the 3rd threshold voltage and the 4th threshold voltage, LLC frequencies
Rate control module controls the switching frequency of LLC series resonance translation circuit switching tubes to be lowermost switch frequency, LLC Schema control moulds
Block control LLC series resonance translation circuits are operated in PFM operational modules；
The frequency values of first threshold switching frequency are between highest switching frequency and lowermost switch frequency；
First threshold voltage, second threshold voltage, the 3rd threshold voltage and the 4th threshold voltage magnitude of voltage it is incremented by successively.
4. a kind of Switching Power Supply LLC series resonances translation circuit control method, it is characterised in that including following operation：
The loop voltage of detection switch voltage；
When loop voltage is between first threshold voltage and second threshold voltage, control LLC series resonances translation circuit switch
The switching frequency of pipe is highest switching frequency, and control LLC series resonance translation circuits are operated in PWM mode；
When loop voltage is between second threshold voltage and the 3rd threshold voltage, control LLC series resonances translation circuit switch
The switching frequency of pipe is first threshold switching frequency, and control LLC series resonance translation circuits are operated in PFM+PWM operational modules；
When loop voltage is between the 3rd threshold voltage and the 4th threshold voltage, control LLC series resonances translation circuit switch
The switching frequency of pipe is lowermost switch frequency, and control LLC series resonance translation circuits are operated in PFM operational modules.
5. according to claim 4 Switching Power Supply LLC series resonance translation circuit control methods, it is characterised in that described first
The frequency values of threshold switch frequency are between highest switching frequency and lowermost switch frequency；
First threshold voltage, second threshold voltage, the 3rd threshold voltage and the 4th threshold voltage magnitude of voltage it is incremented by successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710335274.XA CN107070240A (en) | 2017-05-12 | 2017-05-12 | A kind of Switching Power Supply LLC series resonances translation circuit control device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710335274.XA CN107070240A (en) | 2017-05-12 | 2017-05-12 | A kind of Switching Power Supply LLC series resonances translation circuit control device and method |
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| CN107070240A true CN107070240A (en) | 2017-08-18 |
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| CN201710335274.XA Pending CN107070240A (en) | 2017-05-12 | 2017-05-12 | A kind of Switching Power Supply LLC series resonances translation circuit control device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019136662A1 (en) * | 2018-01-11 | 2019-07-18 | 深圳欣锐科技股份有限公司 | Llc controller and control method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1992493A (en) * | 2005-12-30 | 2007-07-04 | 艾默生网络能源系统有限公司 | Resonant DC/DC converter and control method thereof |
-
2017
- 2017-05-12 CN CN201710335274.XA patent/CN107070240A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1992493A (en) * | 2005-12-30 | 2007-07-04 | 艾默生网络能源系统有限公司 | Resonant DC/DC converter and control method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019136662A1 (en) * | 2018-01-11 | 2019-07-18 | 深圳欣锐科技股份有限公司 | Llc controller and control method |
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Application publication date: 20170818 |
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