CN103595260A - Push-pull - flexible switching converter with serial-connected resonance unit - Google Patents
Push-pull - flexible switching converter with serial-connected resonance unit Download PDFInfo
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- CN103595260A CN103595260A CN201310634088.8A CN201310634088A CN103595260A CN 103595260 A CN103595260 A CN 103595260A CN 201310634088 A CN201310634088 A CN 201310634088A CN 103595260 A CN103595260 A CN 103595260A
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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 invention discloses a push-pull flexible switching converter with a serial-connected resonance unit, wherein the converter comprises a primary push-pull circuit, an isolation transformer, a secondary rectification circuit and an output circuit. The LC resonance unit is connected in series between the isolation transformer and the secondary rectification circuit; and proper charging/discharging capacitance values of a power switch tube of the primary push-pull circuit and proper inductance and capacitance values of the LC resonance unit are set, so that the converter works in a flexible switching state, the power switch tube is switched on with zero voltage and switched off with zero current, and the disconnection peak of a secondary-side rectification unit can be eliminated. Thus, the conversion efficiency is improved, switching noises are reduced, and the converter can be lightened. The converter of the invention is simple in structure, the size of the resonance unit in the converter is small, and the converter can be lightened; the conversion efficiency is higher than that of a traditional converter; and the switching noises due to switching operation can be eliminated, and the electromagnetic compatibility of the converter can be improved.
Description
Technical field
The present invention relates to the converter technique field of power electronics, be specifically related to a kind of push-pull type switch converters.
Background technology
At present, push-pull topology converter is because himself feature is used widely, particularly outstanding in the occasion of low-voltage high input voltage output.Development along with power electronic technology, has proposed miniaturization to power supply product, lightweight, high efficiency requirement.In push-pull converter, filter inductance, electric capacity and transformer account for the significant proportion of volume and weight, and the volume and weight that reduces these components and parts is miniaturization, light-weighted main path.In push-pull converter circuit, improve the cut-off frequency that switching frequency can improve filter accordingly, thus the inductance of selection of small and electric capacity, the volume and weight of reduction filter; Improve switching frequency and can reduce the volume and weight of transformer equally; But when improving switching frequency, switching loss increase, the problem aggravations such as diode reverse recovery, circuit efficiency declines, and electromagnetic interference increases.
Summary of the invention
The switching loss increase that object of the present invention causes at raising switching frequency for solving existing push-pull circuit, diode reverse recovery aggravation, the problems such as circuit efficiency decline and electromagnetic interference, provide a kind of simple in structure, lightweight, switch converters efficiency high, the push-pull converter that electromagnetic interference is little.
Technical scheme of the present invention is as follows:
A series resonance soft switch transducer, comprises former limit push-pull circuit, for DC input voitage is converted to alternating voltage; Isolating transformer, for alternating voltage is boosted, its former limit winding centre tap forms two windings; Secondary side rectification circuit, for the alternating voltage after boosting is carried out to full-wave rectification, produces high direct voltage; Output circuit, the direct current energy of exporting for storing secondary side rectification circuit.
Described former limit push-pull circuit comprises a DC power supply, the first power switch pipe Q1, the second power switch pipe Q2 and two charge and discharge capacitance C1, C2, wherein the drain electrode of the first power switch pipe Q1 is connected with the different name end of the former limit first winding N1 of described isolating transformer, the drain electrode of the second power switch pipe Q2 is connected with the Same Name of Ends of the former limit second winding N2 of described isolating transformer, and the source electrode of the source electrode of the first power switch pipe Q1 and the second power switch pipe Q2 is connected and ground connection; Described charge and discharge capacitance C1 is connected in parallel on the first power switch pipe Q1 source electrode and drain electrode two ends, and charge and discharge capacitance C2 is connected in parallel on the first power switch pipe Q2 source electrode and drain electrode two ends; The positive pole of described DC power supply is connected with the centre tap point on the former limit of isolating transformer, and the negative pole of DC power supply is connected with the first and second power switch pipe source electrode tie points.
Described secondary side rectification circuit is the full-wave rectification bridge being comprised of diode D3, D4, D5 and D6, diode D3 and diode D4 common cathode, diode D5 and the diode D6 common anode utmost point, the anode of diode D3 is connected with the negative electrode of diode D5, and the anode of diode D4 is connected with the negative electrode of diode D6.
The Same Name of Ends of described isolating transformer secondary winding is connected with full-wave rectifying circuit by a resonant element of series connection, wherein resonant element is in series by inductance L and capacitor C, one end of inductance L is connected with the Same Name of Ends of isolating transformer secondary winding, one end of capacitor C is connected with the anode of the diode D3 of full-wave rectifying circuit, and the different name end of described isolating transformer secondary winding is connected with the negative electrode of diode D6 with diode D4 anode.
Described output circuit is comprised of output capacitance C3, and power supply is to load RL, and one end of output capacitance C3 is connected with the diode D3 of full-wave rectification bridge, the common cathode of D4, and the other end of output capacitance C3 is extremely connected with the diode D5 of full-wave rectification bridge, the common anode of D6.
Further, described charge and discharge capacitance C1 and the parasitic capacitance of the optional power switch pipe of C2, also can adopt independent capacitance.
Further, the equivalent leakage inductance that the inductance L of described resonant element is described isolating transformer, can be also separate inductor; The capacitor C of resonant element is the good polypropylene capactive of high frequency characteristics (CBB); Described the first and second power switch pipes adopt field effect transistor.
The present invention recommends the circuit working on the former limit of isolating transformer of series resonance soft switch transducer in push pull mode, by the resonant element generation resonance current voltage of isolating transformer secondary, realize power incoming unit works under soft switching mode, realize the first and second power switch pipes and be operated in zero-current switching and no-voltage opening state, and rectification unit works in zero-current switching state.
The present invention has the following advantages:
1, it is simple in structure that this recommends series resonance soft switch transducer, does necessary improvement just can form according to traditional push-pull converter, simple in structure;
2, this to recommend series resonance soft switch transducer resonant element volume little, can excessively not increase the volume and weight of converter, be beneficial to the lightweight of converter;
3, this recommends series resonance soft switch transducer efficiency has higher conversion efficiency than conventional transducers;
4, this converter can be eliminated the switching noise that switching manipulation causes, has improved the electromagnetic compatibility EMC effect of converter.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of traditional push-pull converter of prior art;
Fig. 2 is the schematic diagram of push-pull resonant soft switch transducer of the present invention;
Fig. 3 is the on off state schematic diagram of power switch pipe under hard switching pattern and resonance soft switching mode;
Fig. 4 is the principle schematic of the working stage 1 of push-pull resonant soft switch transducer of the present invention;
Fig. 5 is the principle schematic of the working stage 2 of push-pull resonant soft switch transducer of the present invention;
Fig. 6 is the principle schematic of the working stage 3 of push-pull resonant soft switch transducer of the present invention;
Fig. 7 is the principle schematic of the working stage 4 of push-pull resonant soft switch transducer of the present invention;
Fig. 8 is the running parameter ideal waveform picture group of push-pull resonant soft switch transducer of the present invention.
Fig. 9 is the soft breaker status simulation checking oscillogram of push-pull resonant soft switch transducer of the present invention.
Embodiment
Below in conjunction with the drawings and the specific embodiments, the invention will be further described.
Referring to Fig. 1, existing traditional push-pull converter comprises: power input circuit and power output circuit.Wherein power input circuit comprises again: direct-current input power supplying, power switch pipe Q1 and Q2, the former limit of the 2 couple winding of the identical number of turn.Power output circuit comprises again: secondary winding, rectifier bridge D3, D4, D5, D6, and output capacitance C3.
The working method of Fig. 1 circuit is: within the period 1, switching tube Q1 is open-minded, and electric current prolongs the winding that the number of turn is N1, and switching tube Q1 flows through.Accordingly, in secondary side, electric current is through rectifying tube D4, output capacitance, and D5 returns to secondary Motor Winding Same Name of Ends.In the time period of all turn-offing at Q1, Q2, output capacitance continues to think load RL power supply.Within second round, switching tube Q2 is open-minded, and Q1 is in off state, and electric current prolongs the winding that the number of turn is N2, and the switching tube Q2 that flows through gets back to DC power supply terminal.Accordingly, in secondary side, electric current is through rectifying tube D3, output capacitance, and D6 returns to secondary winding different name end.
The present invention must improve in the structure of the traditional push-pull converter shown in Fig. 1, structural principle is referring to Fig. 2, its limit, Central Plains push-pull circuit comprises: DC power supply, the first winding of isolating transformer and the second winding, the first and second power switch pipe Q1, Q2, the first and second charge and discharge capacitance C1, C2.Charge and discharge capacitance C1 is connected in parallel on the first power switch pipe Q1 source electrode and drain electrode two ends, and charge and discharge capacitance C2 is connected in parallel on the first power switch pipe Q2 source electrode and drain electrode two ends.The positive pole of direct-current input power supplying is the drain electrode that the first and second windings that N1 is N2 with the number of turn are connected respectively power switch pipe Q1, Q2 by the number of turn, and the negative pole of direct-current input power supplying connects the source electrode of power switch pipe Q1, Q2.
The full-wave rectification bridge that the resonant element that secondary circuit is comprised of secondary winding, inductance L and capacitor C, diode D3, D4, D5, D6 form and output capacitance C3.
Secondary Motor Winding Same Name of Ends connects resonant inductance L one end, the inductance L other end connects resonant capacitance one end, the resonant capacitance other end connects diode D3 anode in full-wave rectification bridge, diode D3 is connected with diode D4 common cathode, diode D anodic bonding diode D6 negative electrode is also connected with secondary winding different name end, diode D6 and diode D5 be anodic bonding altogether, and diode D5 negative electrode connects diode D3 anode.
The parasitic capacitance of charge and discharge capacitance C1 and the optional power switch pipe of C2, also can adopt independent capacitance.
The inductance L of resonant element can be the equivalent leakage inductance of isolating transformer, also can be separate inductor; The capacitor C of resonant element is selected the good polypropylene capactive of high frequency characteristics.
The first power switch pipe and the second power switch pipe can adopt field effect transistor, and the selection that adopts the field effect transistor with negative temperature coefficient conducting resistance is a kind of approach of alleviating magnetic bias problem.
Fig. 3 is the on off state of power switch pipe under hard switching pattern and resonance soft switching mode, this figure has illustrated the switching loss of former limit power switch pipe Q1 and Q2 under hard switching pattern and resonance soft switching mode, according to the form of calculation of switching loss, can clearly show, under resonant type soft-switch pattern, the switching loss of Q1 and Q2 will be significantly less than under hard switching pattern its two loss.
Fig. 4, Fig. 5, Fig. 6 and Fig. 7 are respectively each working stage principle schematic of this converter, in conjunction with this converter key parameter ideal waveform of Fig. 8, are described below:
Under ideal operation condition, ideal operation condition refers to that the switch periods of circuit working equals harmonic period and Dead Time sum, and the parasitic capacitance that wherein this Dead Time meets switching tube drain-source interpolar is charged to ceiling voltage or discharged into for zero needed time from ceiling voltage from zero.
Due to output capacitance, C3 is larger, and it is constant that output voltage can be regarded approximately constant as; Make resonant inductance current i
lwith resonance capacitance voltage v
cinitial value be respectively i
l0and v
c0, i
land v
cshould meet following relationship:
Solve:
v
C(t)＝v
S-v
d+Z
0·i
L0·sinω
0(t-t
0)-(v
S-v
D-v
C0)·cosω
0(t-t
0)
Wherein:
Circuit reaches after stable state, and the switching tube conducting pressure drop of L-C series resonant circuit is constantly zero.Make switching tube from t
0constantly start conducting, in conducting phase, above two formulas can be reduced to;
v
C(t)＝v
C0·cosω
0(t-t
0)。
Circuit can be divided into four working stages, specifically as shown in Fig. 4,5,6,7,8.
Working stage 1[t
0, t
1]: as Fig. 4, at t
0constantly, the drain-source voltage V of switching tube Q1
ds1, oneself drops to zero.T
0constantly, the conducting of switching tube Q1 no-voltage, switching tube Q2 is in off state, and now transformer secondary LC resonant circuit is started working, resonance current i
r, by above freezing being raised to after maximum, drop to zero.Conversion also drops to zero by above freezing after being raised to maximum to the electric current of transformer primary side, and when flowing through the electric current of switching tube Q1 and drop to zero, shutoff Q1, has realized zero-current switching.At this working stage, input is to output transferring energy, the drain-source voltage V of switching tube Q1
ds1, remain zero, the drain-source voltage V of switching tube Q2
ds2remain on the input voltage of twice.Transformer magnetizing current i
mlinear growth, the current i of flowing through in switching tube Q1
1resonance current i
rconversion is to the value i on former limit
r' and exciting current i
mand.
Working stage 2[t
1, t
2]: as Fig. 5, t
1switching tube Q1 turn-offs constantly, and switching tube Q2 keeps off state, and now input stops to output transferring energy, and the energy of load consumption is provided by output capacitance C3.Transformer magnetizing current discharges and recharges drain-source interpolar parasitic capacitance C1, the C2 of switching tube Q1, Q2, makes C1, voltage by zero input voltage that is charged to twice, the voltage of C2 discharges into zero by the input voltage of twice simultaneously.Consider that parasitic capacitance capacitance is very little, exciting current is enough large, the time discharging and recharging is very of short duration, so supposition is linear change discharging and recharging switching tube drain-source voltage across poles in the time.When the voltage of C2 drops to minimum point, charge and discharge process finishes.
Working stage 3[t
3, t
4]: as Fig. 6, the course of work of this working stage is similar with working stage 1.
Working stage 4[t
4, t
5]: as Fig. 7, the course of work of this working stage is similar with working stage 2.
According to soft breaker status simulation checking waveform schematic diagram Fig. 9 provided by the present invention, can clearly see: power switch pipe Q1 and Q2 all work in that no-voltage is opened, zero-current switching state, open and all realized soft handover with turn-offing, and rectification unit also works in zero-current switching state, can reach raising efficiency and the object of improving switching noise.
Claims (3)
1. recommend a series resonance soft switch transducer,
Comprise former limit push-pull circuit, for DC input voitage is converted to alternating voltage;
Isolating transformer, for alternating voltage is boosted, its former limit winding centre tap forms two windings;
Secondary side rectification circuit, for the alternating voltage after boosting is carried out to full-wave rectification, produces high direct voltage;
Output circuit, the direct current energy of exporting for storing secondary side rectification circuit;
It is characterized in that:
Described former limit push-pull circuit comprises a DC power supply, the first power switch pipe Q1, the second power switch pipe Q2 and two charge and discharge capacitance C1, C2, wherein the drain electrode of the first power switch pipe Q1 is connected with the different name end of the former limit first winding N1 of described isolating transformer, the drain electrode of the second power switch pipe Q2 is connected with the Same Name of Ends of the former limit second winding N2 of described isolating transformer, and the source electrode of the source electrode of the first power switch pipe Q1 and the second power switch pipe Q2 is connected and ground connection; Described charge and discharge capacitance C1 is connected in parallel on the first power switch pipe Q1 source electrode and drain electrode two ends, and charge and discharge capacitance C2 is connected in parallel on the first power switch pipe Q2 source electrode and drain electrode two ends; The positive pole of described DC power supply is connected with the centre tap point on the former limit of isolating transformer, and the negative pole of DC power supply is connected with the first and second power switch pipe source electrode tie points;
Described secondary side rectification circuit is the full-wave rectification bridge being comprised of diode D3, D4, D5 and D6, diode D3 and diode D4 common cathode, diode D5 and the diode D6 common anode utmost point, the anode of diode D3 is connected with the negative electrode of diode D5, and the anode of diode D4 is connected with the negative electrode of diode D6;
The Same Name of Ends of described isolating transformer secondary winding is connected with full-wave rectifying circuit by a resonant element of series connection, wherein resonant element is in series by inductance L and capacitor C, one end of inductance L is connected with the Same Name of Ends of isolating transformer secondary winding, one end of capacitor C is connected with the anode of the diode D3 of full-wave rectifying circuit, and the different name end of described isolating transformer secondary winding is connected with the negative electrode of diode D6 with diode D4 anode;
Described output circuit is comprised of output capacitance C3, and power supply is to load RL, and one end of output capacitance C3 is connected with the diode D3 of full-wave rectification bridge, the common cathode of D4, and the other end of output capacitance C3 is extremely connected with the diode D5 of full-wave rectification bridge, the common anode of D6.
2. the series resonance soft switch transducer of recommending according to claim 1, is characterized in that: described charge and discharge capacitance C1 and the parasitic capacitance of the optional power switch pipe of C2, also can adopt independent capacitance.
3. the series resonance soft switch transducer of recommending according to claim 1 and 2, is characterized in that: the equivalent leakage inductance that the inductance L of described resonant element is described isolating transformer can be also separate inductor; The capacitor C of resonant element is the good polypropylene capactive of high frequency characteristics (CBB), and described the first and second power switch pipes adopt field effect transistor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310634088.8A CN103595260A (en) | 2013-12-02 | 2013-12-02 | Push-pull - flexible switching converter with serial-connected resonance unit |
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|---|---|---|---|
| CN201310634088.8A CN103595260A (en) | 2013-12-02 | 2013-12-02 | Push-pull - flexible switching converter with serial-connected resonance unit |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944402A (en) * | 2014-04-15 | 2014-07-23 | 广州金升阳科技有限公司 | Control method of excited push-pull converter with zero-voltage switching and excited push-pull converter |
| CN105048850A (en) * | 2015-07-02 | 2015-11-11 | 南京航空航天大学 | Single-stage ZVS-type push-pull-type high-frequency link DC/AC converter |
| CN105048824A (en) * | 2015-07-02 | 2015-11-11 | 南京航空航天大学 | Voltage clamping soft switch push-pull direct current converter |
| CN105207490A (en) * | 2015-09-29 | 2015-12-30 | 南京航空航天大学 | Flyback-type multi-resonant Sepics |
| CN106329900A (en) * | 2016-08-31 | 2017-01-11 | 苏州迈力电器有限公司 | Voltage peak inhibition circuit for push-pull MOS tube |
| CN106329909A (en) * | 2016-08-31 | 2017-01-11 | 苏州迈力电器有限公司 | Push-pull soft switching control circuit |
| CN106411105A (en) * | 2016-06-17 | 2017-02-15 | 安徽长远绿色能源有限公司 | Soft-switching circuit topology based on charging and discharging of capacitor |
| CN107834581A (en) * | 2017-10-24 | 2018-03-23 | 华南理工大学 | A kind of battery energy storage system of Multiple coil resonance separate current control |
| CN109149951A (en) * | 2017-06-19 | 2019-01-04 | 南京航空航天大学 | A kind of Sofe Switch three-phase current type recommends DC converter |
| CN110086354A (en) * | 2019-05-09 | 2019-08-02 | 江苏理工学院 | Single-phase double push-pull booster circuit and step-up method based on silicon carbide MOSFET |
| CN110752756A (en) * | 2019-10-28 | 2020-02-04 | 北方工业大学 | High-gain conversion circuit and control method thereof |
| CN111181363A (en) * | 2019-07-01 | 2020-05-19 | 苏州纳芯微电子股份有限公司 | Isolated power supply circuit and control method thereof |
| CN112271930A (en) * | 2020-11-16 | 2021-01-26 | 北方工业大学 | Secondary side resonance type LLC converting circuit |
| CN113746348A (en) * | 2021-09-02 | 2021-12-03 | 深圳市华美兴泰科技股份有限公司 | Push-pull series resonance soft switch switching circuit and switching method and chip thereof |
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| CN103078514A (en) * | 2013-01-05 | 2013-05-01 | 浙江大学 | Push-pull converter with voltage multiplying resonance capability |
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| US4301499A (en) * | 1980-06-13 | 1981-11-17 | The United States Of America As Represented By The Secretary Of The Army | Inverter circuit with current equalization |
| CN201674266U (en) * | 2009-12-30 | 2010-12-15 | 旭隼科技股份有限公司 | Resonant power converter and uninterruptible power system utilizing same |
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| CN103944402B (en) * | 2014-04-15 | 2016-08-17 | 广州金升阳科技有限公司 | The control method of the independent-excited push-pull converter of a kind of ZVT and changer |
| CN103944402A (en) * | 2014-04-15 | 2014-07-23 | 广州金升阳科技有限公司 | Control method of excited push-pull converter with zero-voltage switching and excited push-pull converter |
| CN105048824B (en) * | 2015-07-02 | 2019-01-08 | 南京航空航天大学 | A kind of voltage clamp Sofe Switch type recommends DC converter |
| CN105048850A (en) * | 2015-07-02 | 2015-11-11 | 南京航空航天大学 | Single-stage ZVS-type push-pull-type high-frequency link DC/AC converter |
| CN105048824A (en) * | 2015-07-02 | 2015-11-11 | 南京航空航天大学 | Voltage clamping soft switch push-pull direct current converter |
| CN105048850B (en) * | 2015-07-02 | 2018-10-16 | 南京航空航天大学 | A kind of single-stage ZVS types push-pull type high frequency link DC/AC converters |
| CN105207490A (en) * | 2015-09-29 | 2015-12-30 | 南京航空航天大学 | Flyback-type multi-resonant Sepics |
| CN106411105A (en) * | 2016-06-17 | 2017-02-15 | 安徽长远绿色能源有限公司 | Soft-switching circuit topology based on charging and discharging of capacitor |
| CN106411105B (en) * | 2016-06-17 | 2019-03-15 | 安徽长远绿色能源有限公司 | A kind of soft switch circuit topology based on capacitor charge and discharge |
| CN106329900A (en) * | 2016-08-31 | 2017-01-11 | 苏州迈力电器有限公司 | Voltage peak inhibition circuit for push-pull MOS tube |
| CN106329909A (en) * | 2016-08-31 | 2017-01-11 | 苏州迈力电器有限公司 | Push-pull soft switching control circuit |
| CN109149951A (en) * | 2017-06-19 | 2019-01-04 | 南京航空航天大学 | A kind of Sofe Switch three-phase current type recommends DC converter |
| CN109149951B (en) * | 2017-06-19 | 2021-02-09 | 南京航空航天大学 | Soft-switching three-phase current type push-pull direct-current converter |
| CN107834581A (en) * | 2017-10-24 | 2018-03-23 | 华南理工大学 | A kind of battery energy storage system of Multiple coil resonance separate current control |
| CN110086354A (en) * | 2019-05-09 | 2019-08-02 | 江苏理工学院 | Single-phase double push-pull booster circuit and step-up method based on silicon carbide MOSFET |
| CN111181363A (en) * | 2019-07-01 | 2020-05-19 | 苏州纳芯微电子股份有限公司 | Isolated power supply circuit and control method thereof |
| CN111181363B (en) * | 2019-07-01 | 2020-10-16 | 苏州纳芯微电子股份有限公司 | Isolated power supply circuit and control method thereof |
| CN110752756A (en) * | 2019-10-28 | 2020-02-04 | 北方工业大学 | High-gain conversion circuit and control method thereof |
| CN112271930A (en) * | 2020-11-16 | 2021-01-26 | 北方工业大学 | Secondary side resonance type LLC converting circuit |
| CN112271930B (en) * | 2020-11-16 | 2022-03-25 | 北方工业大学 | Secondary side resonance type LLC converting circuit |
| CN113746348A (en) * | 2021-09-02 | 2021-12-03 | 深圳市华美兴泰科技股份有限公司 | Push-pull series resonance soft switch switching circuit and switching method and chip thereof |
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Application publication date: 20140219 |