CN206977316U - A kind of control device of LCC resonance DC DC converters - Google Patents
A kind of control device of LCC resonance DC DC converters Download PDFInfo
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- CN206977316U CN206977316U CN201720931656.4U CN201720931656U CN206977316U CN 206977316 U CN206977316 U CN 206977316U CN 201720931656 U CN201720931656 U CN 201720931656U CN 206977316 U CN206977316 U CN 206977316U
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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
Abstract
The utility model discloses a kind of control device of LCC resonance DC DC converters, output voltage sampling circuit (100) is connected to error originated from input amplifying circuit (200) after the output sampling of LCC resonance DC DC converters, error amplifying circuit with the first modulation circuit (310) and the second modulation circuit (320) signal be arrangeding in parallel；Switch driving circuit (400) receives the output signal v from the second modulation circuit (320)1, and export the drive signal v of LCC resonance DC DC converter switches pipesg1、vg2.The utility model 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
It the utility model is related 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.
Utility model content
The purpose of this utility model is to provide a kind of control device of novel LCC resonance DC-DC converters, so that LCC
Resonance DC-DC converter keeps Sofe Switch operation in wide input voltage and wide output power range, while makes LCC resonance DC-
The switching frequency of DC converters changes in narrower range.
To realize its purpose, the used specific practice of technical scheme is the utility model：
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 utility model are：
1st, relative to traditional VFC LCC resonance DC-DC converters, using LCC resonance DC-DCs of the present utility model
Convertor controls mode switch frequency range is smaller；2nd, relative to traditional fixed-frequency control LCC resonance DC-DC converters,
It can be achieved in wide input voltage and wide loading range using LCC resonance DC-DCs convertor controls mode of the present utility model
The Zero-voltage soft switch operation of switching tube；3rd, relative to traditional fixed-frequency control LCC resonance DC-DC converters, using this practicality
New LCC resonance DC-DC convertor controls modes can be such that resonant element voltage x current stress effectively reduces.
Brief description of the drawings
Fig. 1 is the utility model LCC resonance DC-DC changer system structured flowcharts.
Fig. 2 is the main oscillogram of circuit shown in Fig. 1.
Fig. 3 is the utility model embodiment electrical block diagram.
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 utility model below by specific example with reference.
Fig. 1 is system architecture diagram of the present utility model, including output voltage sampling circuit 100, error amplifying circuit
200th, the first modulation circuit 310, the second modulation circuit 320, switch driving circuit 400.Further, output voltage sampling electricity
Road 100 produces output signal v after gathering output voltageoTo error amplifying circuit 200；Error amplifying circuit 200 is by by voWith it is interior
Portion's reference voltage VrefCarry out error amplification, output error signal veTo the first modulation circuit 310 and the second modulation circuit 320；The
One modulation circuit 310 exports the first modulated signal vsaw1To the second modulation circuit 320；Second modulation circuit 320 output second is adjusted
Signal v processedsaw2With comparative result v1To the first modulation circuit 310 and switch driving circuit 400；Switch driving circuit 400 is according to saw
Tooth ripple 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 that a kind of embodiment of the present utility model 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 disability saw-toothed wave generator 311 makes its output be maintained zero.Further
Ground, as the second modulated signal vsaw2Rise to and error signal veWhen equal, the second comparator 326, which is exported from low level, is changed into 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 are captured, now
Second J-K flip flop 401 exports anti-phase so that first switch pipe S in LCC resonance DC-DC converters1It is changed into closing from conducting state
Disconnected state, second switch pipe S2Conducting state is changed into from off state.Further, as the second modulated signal vsaw2On continuing
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 the first J-K
Trigger 321 is captured with the second J-K flip flop 401, now the 321 positive saw of output signal disability second of the first J-K flip flop
Tooth wave producer 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 hair
Raw device 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.This practicality as can be seen from Figure 4
The control method of new proposition realizes the output voltage stabilizing function of converter and switching tube works in Zero-voltage soft switch state；
More specifically, in second switch pipe S2Shut-off, first switch pipe S1In turn on process, LCC resonance DC-DC converter voltages vABBy
0 rises to Vin, now circuit resonance electric current irLess than 0, due to switching tube S1、S2Dead time in action process be present, first opens
Close pipe S1Body diode will be prior to switching tube S1Conducting, first switch pipe S1Work in no-voltage conducting state；In first switch pipe
S1Shut-off, second switch pipe S2In turn on process, LCC resonance DC-DC converter voltages vABBy Vin0 is dropped to, now circuit is humorous
Shake 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
Second switch pipe S2Conducting, second switch pipe S2Work in as no-voltage conducting state.Fig. 5, Fig. 6 and Fig. 7 are to be imitated respectively in Fig. 4
Input voltage is raised in true environment, reduces power output while raises the emulation ripple that input voltage obtains with reducing power output
Shape.From Fig. 5, Fig. 6 and Fig. 7 as can be seen that the utility model proposes control method realize wide input voltage range with
The output voltage stabilizing function of converter is realized in wide output power range, and maintains the Zero-voltage soft switch operation shape of switching tube
State.
Above-described embodiment is the preferable embodiment of the utility model, but embodiment of the present utility model is not by above-mentioned
The limitation of embodiment, it is other it is any without departing from Spirit Essence of the present utility model with made under principle change, modify, replace
Generation, combination, simplify, should be equivalent substitute mode, be included within the scope of protection of the utility model.
Claims (2)
1. a kind of control device of LCC resonance DC-DCs converter, control circuit control converter output voltage maintains specified
Value, makes LCC resonance DC-DC converters be operated in Zero-voltage soft switch state, it is characterised in that output voltage sampling circuit
(100) error originated from input amplifying circuit (200) after the output sampling of LCC resonance DC-DCs converter, error amplifying circuit are set with parallel
The first modulation circuit (310) put connects with the second modulation circuit (320) signal；Switch driving circuit (400) is received from the
The output signal v of two modulation circuits (320)1, and export the drive signal v of LCC resonance DC-DC converter switches pipesg1、vg2。
2. the control device of LCC resonance DC-DCs converter according to claim 1, 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。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720931656.4U CN206977316U (en) | 2017-07-28 | 2017-07-28 | A kind of control device of LCC resonance DC DC converters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720931656.4U CN206977316U (en) | 2017-07-28 | 2017-07-28 | A kind of control device of LCC resonance DC DC converters |
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| Publication Number | Publication Date |
|---|---|
| CN206977316U true CN206977316U (en) | 2018-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720931656.4U Expired - Fee Related CN206977316U (en) | 2017-07-28 | 2017-07-28 | A kind of control device of LCC resonance DC DC converters |
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| CN (1) | CN206977316U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980941A (en) * | 2019-03-20 | 2019-07-05 | 深圳市皓文电子有限公司 | The switch control unit and converter of the dcdc converter of LCC resonance |
| WO2021042812A1 (en) * | 2019-09-05 | 2021-03-11 | 深圳南云微电子有限公司 | Control method and circuit for active clamping flyback converter |
-
2017
- 2017-07-28 CN CN201720931656.4U patent/CN206977316U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980941A (en) * | 2019-03-20 | 2019-07-05 | 深圳市皓文电子有限公司 | The switch control unit and converter of the dcdc converter of LCC resonance |
| CN109980941B (en) * | 2019-03-20 | 2021-04-13 | 深圳市皓文电子有限公司 | Switch control unit of LCC resonant DCDC converter and converter |
| WO2021042812A1 (en) * | 2019-09-05 | 2021-03-11 | 深圳南云微电子有限公司 | Control method and circuit for active clamping flyback converter |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180206 Termination date: 20200728 |