CN107359799A - A kind of control method and its device of LCC resonance DC DC converters - Google Patents
A kind of control method and its device of LCC resonance DC DC converters Download PDFInfo
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- CN107359799A CN107359799A CN201710632616.4A CN201710632616A CN107359799A CN 107359799 A CN107359799 A CN 107359799A CN 201710632616 A CN201710632616 A CN 201710632616A CN 107359799 A CN107359799 A CN 107359799A
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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
- H02M3/337—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 in push-pull configuration
- H02M3/3376—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 in push-pull configuration with automatic control of output voltage or current
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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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 control method and its device of LCC resonance DC DC converters, and for controlling LCC resonance DC DC converters to realize, wide input voltage range is run with the Zero-voltage soft switch in wide loading range；The ON time of LCC resonance DC DC converter switches pipes is controlled with the turn-off time by circuit, the ON time of switching tube is changed with the turn-off time as input voltage changes with load；The ON time of switching tube is determined with the turn-off time by the error amount of output voltage and reference signal；Because resonance current can not be mutated, the body diode of another switching tube will readily conduct after the shut-off of either switch pipe, therefore switching tube works in Zero-voltage soft switch state.The present invention can reduce the switching frequency excursion of traditional LC C resonance DC DC converters, maintain Zero-voltage soft switch service condition of the LCC resonance DC DC converters in wide input voltage and wide loading range.
Description
Technical field
The present invention relates to a kind of control method and its device of LCC resonance DC-DCs converter.
Background technology
In recent years, Power Electronic Technique develops rapidly, as field of power electronics important component power technology by
Gradually turn into the focus of application and research.Switch converters are with its efficiency high, power density is high and establishes it in field of power supplies
Dominant position, with industry requirement continuous improvement, Switching Power Supply also constantly towards miniaturization, modularization, high frequency side
To development.Controlled resonant converter disturbs to have obtained the wide of industrial quarters and academia because of its good Sofe Switch characteristic and relatively low EMI
General attention.In traditional two element controlled resonant converter, series resonant converter underloading voltage regulation capability is poor, parallel resonance converter
Light-load efficiency is low, and LCC controlled resonant converters also overcome the shortcomings that corresponding while in summary both advantages, extensively should
For all kinds of occasions.The control method of traditional LC C resonance DC-DC converters has two kinds：First, VFC, i.e., become by adjusting
Parallel operation switching frequency realizes output voltage stabilizing function；Second, fixed-frequency control, i.e., realize output by adjusting converter dutycycle
Voltage stabilizing function.The general implementation complexity for considering control circuit, the widely used VFC of LCC resonance DC-DC converters, but
It is that the change of traditional frequency conversion controlling switch frequency is wide, seriously adds the design difficulty of magnetic element and drive circuit in converter；
On the other hand using VFC controlled resonant converter different input voltages and during power output EMI spectrum distributions also with switch
Frequency is different and changes, and this also brings difficulty to the design of all kinds of electromagnetic interface filters.Although fixed-frequency control is by ensuring switching frequency
Fixation eliminates problem above, but LCC resonance DC-DC converter soft switch scope critical constraints, and increases the electricity of each element
Current voltage stress, therefore be not used widely.
The content of the invention
It is an object of the invention to provide a kind of novel LCC resonance DC-DC inverter control methods, can be made using this method
LCC resonance DC-DCs converter keeps Sofe Switch operation in wide input voltage and wide output power range, while makes LCC resonance
The switching frequency of DC-DC converter changes in narrower range.
The present invention realizes its goal of the invention, and used technical scheme is a kind of modified pulse width modulation control method, its
Specifically the practice is：
A kind of LCC resonance DC-DCs inverter control method, control circuit control converter output voltage maintain specified
Value, makes LCC resonance DC-DC converters be operated in Zero-voltage soft switch state.Each switching tube of LCC resonance DC-DCs converter
ON time and turn-off time together decided on and with error signal by the first modulation circuit 310 and the second modulation circuit 320
veChange and change, make two switching tube Continuity signals in LCC resonance DC-DC converters complementary：When either switch pipe turns off
When, because the afterflow of resonant inductance acts on, the body diode of another switching tube can turn on immediately, switching tube is worked in zero electricity
Press Sofe Switch state；Wherein：Controller uses the first modulated signal vsaw1With the second modulated signal vsaw2, error signal ve, reference
Signal VtConverter switches pipe action sequence is controlled, and the first modulated signal vsaw1Second modulated signal v when enabledsaw2
Disability, the second modulated signal vsaw2First modulated signal v when enabledsaw1Disability；Specially：
First modulated signal vsaw1, the second modulated signal vsaw2With error signal veTogether decide on first switch pipe S1Lead
The logical time；Second modulated signal vsaw2, error signal veWith reference signal VtTogether decide on second switch pipe S2ON time；
Second switch pipe S2Continuity signal and first switch pipe S1Continuity signal it is complementary；
Second modulated signal vsaw2After enabled, first switch pipe S1Tend to remain on, second switch pipe S2It is held off shape
State；As the second modulated signal vsaw2Rise to and error signal veWhen equal, first switch pipe S1Switch to off state, second
Switching tube S2Switching-on state, hereafter, the second modulated signal vsaw2Continue to rise, as the second modulated signal vsaw2With reference
Signal VtWhen equal：First switch pipe S1Switching-on state, second switch pipe S2Off state is switched to, while first adjusts
Signal v processedsaw1Enabled state, the second modulated signal v are converted into by disabled statesaw2Disabled state is converted into by enabled state；The
One modulated signal vsaw2Rise to and error signal veWhen equal：First modulated signal vsaw1Disability shape is converted into by enabled state
State, the second modulated signal vsaw2Enabled state is converted into by disabled state；
The error signal veAmplify electricity in error after being sampled by voltage sampling circuit 100 to LCC resonance DC-DCs converter
Obtained in road 200 through comparing enhanced processing.
It is a further object of the present invention to provide a kind of device for realizing above LCC resonance DC-DC inverter control methods, its
Specific means is：
The control device of LCC resonance DC-DC converters, in control circuit, output voltage sampling circuit 100 is humorous to LCC
Error originated from input amplifying circuit 200 after DC-DC converter of shaking output sampling, error amplifying circuit 200 and the first tune be arrangeding in parallel
Circuit 310 processed connects with the signal of the second modulation circuit 320；Switch driving circuit 400 is received from the defeated of the second modulation circuit 320
Go out signal v1, and export the drive signal v of LCC resonance DC-DC converter switches pipesg1、vg2。
Further, the error amplifying circuit 200 by error amplifier 202 and reference voltage source 203 and is connected across mistake
The poor negative terminal of amplifier 202 and the compensation network 201 of output end are formed；First modulation circuit 310 is by the first saw-toothed wave generator 311
And the first comparator 312 of output end connection is formed therewith；Second modulation circuit 320 is by the first J-K flip flop for being linked in sequence
321st, the second saw-toothed wave generator 322, the 3rd comparator 325 and the first OR gate 328 form, and the second comparator 326 is connected to
Between the output of two saw-toothed wave generators 322 and impulse generator 327, the output end of impulse generator 327 and the first OR gate 328
It is connected；Second OR gate 324 is connected between the input of the 3rd comparator 325 and the first J-K flip flop 321, reference voltage source 323
It is connected with the 3rd comparator 325；The output of first J-K flip flop 321 also connects with the input of the first saw-toothed wave generator 311
Connect；Switch driving circuit 400 is made up of the second J-K flip flop 401 and the first drive circuit 403 and the second drive circuit 402；Institute
The negative input for stating error amplifier 202 is connected to resistance pressure-dividing network sampling output, the positive input of error amplifier 202
End is connected to the voltage V of reference voltage source 203ref, the output signal v of voltage sampling circuit 100oWith the voltage V of reference voltage source 203ref
Error signal v is produced after error is amplifiede；First modulation circuit 310 receives the first J-K in the second modulation circuit 320 and touched
Send out the reverse output signal v of device 321nqWith the output signal v of error amplifier 202e, and export comparative result vc1；Described second adjusts
Circuit 320 processed receives the comparative result v of the first modulation circuit 310c1With the output signal v of error amplifier 202e, through the first OR gate
328 output logic operation result v1；Switch driving circuit 400 receives the output signal v from the second modulation circuit 3201, and it is defeated
Go out the drive signal v of LCC resonance DC-DC converter switches pipesg1、vg2。
Compared with prior art, the beneficial effects of the invention are as follows：
1st, relative to traditional VFC LCC resonance DC-DC converters, converted using the LCC resonance DC-DCs of the present invention
Device control mode switching frequency excursion is smaller；2nd, relative to traditional fixed-frequency control LCC resonance DC-DC converters, use
Switching tube can be achieved in the LCC resonance DC-DC convertor controls modes of the present invention in wide input voltage and wide loading range
Zero-voltage soft switch is run；3rd, relative to traditional fixed-frequency control LCC resonance DC-DC converters, using the LCC resonance of the present invention
DC-DC converter control mode can be such that resonant element voltage x current stress effectively reduces.
Brief description of the drawings
Fig. 1 is LCC resonance DC-DCs changer system structured flowchart of the present invention.
Fig. 2 is the main oscillogram of circuit shown in Fig. 1.
Fig. 3 is electrical block diagram of the embodiment of the present invention.
Fig. 4 is simulation result of the circuit structure diagram shown in Fig. 3 in low-voltage input, heavy duty output, and wherein circuit parameter is：
Ls=65 μ H, Cs=56nF, Cp=56nF, Lf=100 μ H, Cf=200 μ F, k1=0.52V/ μ s, k2=0.7V/ μ s, Vin=
200V, Vo=48V, Po=500W.
Fig. 5 is Fig. 3 in high voltage input, heavy duty output (Vin=400V, Po=500W) when simulation result.
Fig. 6 is Fig. 3 (V in low-voltage input, underloading outputin=200V, Po=100W) power when simulation result.
Fig. 7 is Fig. 3 (V in high input voltage, underloading outputin=400V, Po=100W) simulation result.
Embodiment
Further detailed description is done to the present invention below by specific example with reference.
Fig. 1 is the system architecture diagram of the present invention, including output voltage sampling circuit 100, error amplifying circuit 200, the
One modulation circuit 310, the second modulation circuit 320, switch driving circuit 400.Further, output voltage sampling circuit 100
Output signal v is produced after gathering output voltageoTo error amplifying circuit 200；Error amplifying circuit 200 is by by voWith internal base
Quasi- voltage VrefCarry out error amplification, output error signal veTo the first modulation circuit 310 and the second modulation circuit 320；First adjusts
Circuit 310 processed exports the first modulated signal vsaw1To the second modulation circuit 320；Second modulation circuit 320 output the second modulation letter
Number vsaw2With comparative result v1To the first modulation circuit 310 and switch driving circuit 400；Switch driving circuit 400 is according to sawtooth waveforms
Signal vsaw2Produce the gate pole control signal v of LCC resonance DC-DCs converter first switch pipe and second switch pipeg1、vg2。
Fig. 2 is the main oscillogram of circuit shown in Fig. 1.From oscillogram it is known that in a switch periods, the first modulation
Signal vsaw1With the second modulated signal vsaw2It is alternately present：In switch periods initial time, vsaw1Start from zero potential with fixed oblique
Rate k1Rise, while vsaw2It is clamped to zero potential；Work as vsaw1Rise to and error signal veWhen equal, vsaw2Start from zero potential
With fixed slope k2Rise, while vsaw1It is clamped to zero potential；Work as vsaw2Rise to and reference signal VtWhen equal, converter
Into next switch periods.From oscillogram it is known that the on, off time of the switching tube of LCC resonance DC-DCs converter two
By the first modulated signal vsaw1With the second modulated signal vsaw2Together decide on：In the first modulated signal vsaw1With the second modulated signal
vsaw2Error signal v is risen to from zero potentialeIn period, LCC resonance DC-DC converter first switch pipes S1Be held on and
Two switching tube S2It is held off；In the second modulated signal vsaw2From error signal veRise to reference signal VtIn period, LCC is humorous
DC-DC converter of shaking first switch pipe S1It is held off and second switch pipe S2It is held on.
Fig. 3 shows, a kind of embodiment of the invention is, a kind of LCC resonance DC-DCs inverter control method and its
Device, its specific practice are：
LCC resonance DC-DCs converter control circuit includes output voltage sampling circuit 100, error amplifying circuit 200, the
One modulation circuit 310, the second modulation circuit 320, switch driving circuit 400.Further, output voltage sampling circuit 100
By resistance R1101st, resistance R2102 compositions；Error amplifying circuit 200 is by compensation network 201, error amplifier 202 and reference voltage
Source Vref203 compositions；First modulation circuit 310 is made up of the first saw-toothed wave generator 311, first comparator 312；Second modulation
Circuit 320 is by the first J-K flip flop 321, the second saw-toothed wave generator 322, the second comparator 326, the 3rd comparator 325, arteries and veins
Generator 327, the first OR gate 328, the second OR gate 324, reference voltage source 323 is rushed to form；Switch driving circuit 400 is by the 2nd J-
K triggers 401, first switch tube drive circuit 403, second switch drive circuit 402 form.The negative sense of error amplifier 202
Input accesses the output end of output voltage sampling circuit 100, voltage on the basis of the positive input of error amplifier 202
Vref203, sampled output signal voWith reference voltage VrefError signal v is produced after error is amplifiede.First modulation circuit 310 with
Second modulation circuit 320 produces the first modulated signal v respectivelysaw1, the second modulated signal vsaw2, when in the first modulation circuit 310
One modulated signal vsaw1Rise to and error signal veWhen equal, first comparator 312, which is exported from low level, is changed into high level, its
Rising edge is captured by the first J-K flip flop 321 in the second modulation circuit 320, now 321 positive output end of the first J-K flip flop
The second saw-toothed wave generator 322 in enabled second modulation circuit 320 makes its output voltage gradient be fixed as k2The second modulated signal
vsaw2, while the inverse output terminal of the first J-K flip flop 321 the first saw-toothed wave generator 311 of disability makes its output be maintained zero.Enter
One step, as the second modulated signal vsaw2Rise to and error signal veWhen equal, the second comparator 326 exports to be become by low level
For high level, the second J-K flip flop 401 that the rising edge is switched on and off in drive circuit 400 through impulse generator 327 is captured,
Now the second J-K flip flop 401 exports anti-phase so that first switch pipe S in LCC resonance DC-DC converters1Become by conducting state
For off state, second switch pipe S2Conducting state is changed into from off state.Further, as the second modulated signal vsaw2After
It is continuous to rise to and reference signal VtWhen equal, the 3rd comparator 325, which is exported from low level, is changed into high level, and the rising edge is by first
J-K flip flop 321 is captured with the second J-K flip flop 401, now the 321 positive output signal disability second of the first J-K flip flop
Saw-toothed wave generator 322, its output is maintained the inverse output terminal of the zero, while first J-K flip flop 321 and enable the first sawtooth waveforms
Generator 311 makes its output voltage gradient be fixed as k1The first modulated signal, while the second J-K flip flop 401 export it is anti-phase so that
First switch pipe S in LCC resonance DC-DC converters1Conducting state, second switch pipe S are changed into from off state2By conducting state
Become an OFF state.
Fig. 4, Fig. 5, Fig. 6 and Fig. 7 are the simulation waveforms obtained using PSIM simulation softwares.It is of the invention as can be seen from Figure 4
The control method of proposition realizes the output voltage stabilizing function of converter and switching tube works in Zero-voltage soft switch state；More
Body, in second switch pipe S2Shut-off, first switch pipe S1In turn on process, LCC resonance DC-DC converter voltages vABOn 0
Rise to Vin, now circuit resonance electric current irLess than 0, due to switching tube S1、S2Dead time, first switch in action process be present
Pipe S1Body diode will be prior to switching tube S1Conducting, first switch pipe S1Work in no-voltage conducting state；In first switch pipe S1
Shut-off, second switch pipe S2In turn on process, LCC resonance DC-DC converter voltages vABBy Vin0 is dropped to, now circuit resonance
Electric current irMore than 0, due to switching tube S1、S2Dead time, second switch pipe S in action process be present2Body diode will be prior to
Two switching tube S2Conducting, second switch pipe S2Work in as no-voltage conducting state.Fig. 5, Fig. 6 and Fig. 7 are to be emulated respectively in Fig. 4
Input voltage is raised in environment, reduces power output while raises the simulation waveform that input voltage obtains with reducing power output.
As can be seen that control method proposed by the present invention is realized in wide input voltage range and wide output work from Fig. 5, Fig. 6 and Fig. 7
The output voltage stabilizing function of converter is realized in the range of rate, and maintains the Zero-voltage soft switch running status of switching tube.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (3)
1. a kind of LCC resonance DC-DCs inverter control method, control circuit control converter output voltage maintains designated value,
LCC resonance DC-DC converters are made to be operated in Zero-voltage soft switch state, it is characterised in that LCC resonance DC-DC converters are respectively opened
Close pipe ON time and turn-off time together decided on by the first modulation circuit (310) and the second modulation circuit (320) and with
Error signal veChange and change, make two switching tube Continuity signals in LCC resonance DC-DC converters complementary：Opened when any
When closing pipe shut-off, because the afterflow of resonant inductance acts on, the body diode of another switching tube can turn on immediately, make the equal work of switching tube
Make in Zero-voltage soft switch state；Wherein：Controller uses the first modulated signal vsaw1With the second modulated signal vsaw2, error letter
Number ve, reference signal VtConverter switches pipe action sequence is controlled, and the first modulated signal vsaw1Second modulates when enabled
Signal vsaw2Disability, the second modulated signal vsaw2First modulated signal v when enabledsaw1Disability；Specially：
First modulated signal vsaw1, the second modulated signal vsaw2With error signal veTogether decide on first switch pipe S1Conducting when
Between；Second modulated signal vsaw2, error signal veWith reference signal VtTogether decide on second switch pipe S2ON time；Second
Switching tube S2Continuity signal and first switch pipe S1Continuity signal it is complementary；
Second modulated signal vsaw2After enabled, first switch pipe S1Tend to remain on, second switch pipe S2It is held off；
As the second modulated signal vsaw2Rise to and error signal veWhen equal, first switch pipe S1Switch to off state, second switch
Pipe S2Switching-on state, hereafter, the second modulated signal vsaw2Continue to rise, as the second modulated signal vsaw2With reference signal
VtWhen equal：First switch pipe S1Switching-on state, second switch pipe S2Switch to off state, while the first modulation letter
Number vsaw1Enabled state, the second modulated signal v are converted into by disabled statesaw2Disabled state is converted into by enabled state；First adjusts
Signal v processedsaw2Rise to and error signal veWhen equal：First modulated signal vsaw1Disabled state, are converted into by enabled state
Two modulated signal vsaw2Enabled state is converted into by disabled state；
The error signal veIn error amplifying circuit after being sampled by voltage sampling circuit (100) to LCC resonance DC-DCs converter
(200) obtained in through comparing enhanced processing.
2. using the control device of the LCC resonance DC-DC converters such as claim 1 method, it is characterised in that control circuit
In, error originated from input amplifying circuit (200) after output voltage sampling circuit (100) samples to the output of LCC resonance DC-DCs converter,
Error amplifying circuit is connected with the first modulation circuit (310) and the second modulation circuit (320) signal be arrangeding in parallel；Switch drive
Circuit (400) receives the output signal v from the second modulation circuit (320)1, and export LCC resonance DC-DC converter switches pipes
Drive signal vg1、vg2。
3. the control device of the LCC resonance DC-DC converters according to claim, it is characterised in that the error amplification
Circuit (200) is by error amplifier (202) and reference voltage source (203) and is connected across error amplifier (202) negative terminal and output
The compensation network (201) at end is formed；By the first saw-toothed wave generator (311) and therewith, output end connects first modulation circuit (310)
The first comparator (312) connect is formed；Second modulation circuit (320) by be linked in sequence the first J-K flip flop (321), second
Saw-toothed wave generator (322), the 3rd comparator (325) and the first OR gate (328) composition, the second comparator (326) are connected to the
Between the output of two saw-toothed wave generators (322) and impulse generator (327), the output end of impulse generator and the first OR gate
(328) it is connected；Second OR gate (324) is connected between the 3rd comparator (325) and the input of the first J-K flip flop (321), ginseng
Voltage source (323) is examined to be connected with the 3rd comparator (325)；The output of first J-K flip flop (321) also occurs with the first sawtooth waveforms
The input connection of device (311)；Switch driving circuit (400) is by the second J-K flip flop (401) and the first drive circuit (403)
Formed with the second drive circuit (402)；The negative input of the error amplifier (202) is connected to resistance pressure-dividing network sampling
Output, the positive input of error amplifier (202) are connected to reference voltage source (203) voltage Vref, voltage sampling circuit
(100) output signal voWith reference voltage source (203) voltage VrefError signal v is produced after error is amplifiede；First modulation
Circuit (310) receives the reverse output signal v of the first J-K flip flop (321) in the second modulation circuit (320)nqAmplify with error
Device (202) output signal ve, and export comparative result vc1；Second modulation circuit (320) receives the first modulation circuit (310)
Comparative result vc1With error amplifier (202) output signal ve, logic operation result v is exported through the first OR gate (328)1；Open
Close drive circuit (400) and receive the output signal v from the second modulation circuit (320)1, and export LCC resonance DC-DC converters
The drive signal v of switching tubeg1、vg2。
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| CN201710632616.4A CN107359799A (en) | 2017-07-28 | 2017-07-28 | A kind of control method and its device of LCC resonance DC DC converters |
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| CN201710632616.4A CN107359799A (en) | 2017-07-28 | 2017-07-28 | A kind of control method and its device of LCC resonance DC DC converters |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108566699A (en) * | 2018-01-17 | 2018-09-21 | 深圳市和拓创新科技有限公司 | A kind of LED drive circuit device of automobile-used wide range input |
| CN112910259A (en) * | 2019-12-03 | 2021-06-04 | 中车株洲电力机车研究所有限公司 | LLC conversion power supply, controller thereof and switching frequency tracking and adjusting method |
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| JPH09201053A (en) * | 1995-09-22 | 1997-07-31 | Toko America Inc | Pulse width modulation control device for resonance converter |
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| CN112910259A (en) * | 2019-12-03 | 2021-06-04 | 中车株洲电力机车研究所有限公司 | LLC conversion power supply, controller thereof and switching frequency tracking and adjusting method |
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