CN102857091A - Soft switching circuit - Google Patents
Soft switching circuit Download PDFInfo
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- CN102857091A CN102857091A CN2012101140626A CN201210114062A CN102857091A CN 102857091 A CN102857091 A CN 102857091A CN 2012101140626 A CN2012101140626 A CN 2012101140626A CN 201210114062 A CN201210114062 A CN 201210114062A CN 102857091 A CN102857091 A CN 102857091A
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- China
- Prior art keywords
- fast recovery
- recovery diode
- capacitor
- buffer
- main switching
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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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Abstract
The invention relates to a soft switching circuit, and in particular relates to an electric energy conversion circuit which is applied to a Buck converter under a middle and small power occasion. The soft switching circuit provided by the invention comprises an input power supply Ui, a main switching pipe VT, a fly-wheel diode VD, a filtering inductor L, a filtering capacitor C, a load resistor R and a resonant loop; the resonant loop is composed of a buffer inductor Lr, a buffer capacitor Cr, an energy storage inductor Ls, an energy storage capacitor Cs and four fast recovery diodes including a VD1, a VD2, a VD3 and a VD4. The circuit disclosed by the invention can not introduce additional voltage stress for the main switching pipe VT within the operating range, and the maximal voltage on the main switching pipe VT is an input voltage; and meanwhile, energy stored on the buffer inductor Lr is discharged completely before the energy storage capacitor Cs begins to discharge, thus the main switching pipe VT is not provided with additional current stress, the stress applied to the main switching tube is reduced effectively, the average non-fault time of the main switching pipe VT is increased, and the service life of the device is prolonged.
Description
Technical field
The present invention relates to a kind of soft switch circuit, be specially a kind of electrical energy conversion circuit that is applied to the Buck converter under the middle low power occasion.
Background technology
In recent years, Development of Power Electronic Technology is swift and violent, and direct-current switch power supply is widely used in the fields such as computer, Aero-Space.Nowadays, the supply unit of heavy type, poor efficiency is replaced by small-sized, efficient power.For high-performance, high efficiency, the high reliability that realizes supply unit, must realize the high frequency of Switching Power Supply.The DC-DC converter is the chief component of direct-current switch power supply, presses the Switching Condition of switching tube, and the DC-DC converter can be divided into two kinds on hard switching and soft switch.The switching device of hard switching DC converter is in the situation that bear voltage or current flowing is switched on or switched off circuit, therefore open or turn off process in be accompanied by larger switching loss.The approach that reduces switching loss is exactly to realize the soft switch of switching tube, and therefore soft switch arises at the historic moment.
Main devices type according to soft switch technique uses can be divided into the active soft switching technology of having used the active switch device, and the passive flexible switch technology of only using passive device.The defectives such as the soft switch effect of active soft switching technology is better, but has control complicated, and cost is higher, and reliability is relatively low.Although it is good that the obtained soft switch effect of passive flexible switch technology is not so good as the active soft switching technology, but owing to only using the passive devices such as inductance, electric capacity, need not to be attached with the source switch device, just do not change the design of original circuit parameter and control signal yet, has circuit simple, use the advantages such as convenient, that reliability is high, widely applicable, higher cost performance is arranged.
The passive soft on-off circuit that occurs the earliest is to utilize the excess energy of resistance absorption device reverse recovery current generation and be transformed into dissipation of heat, but has increased the heat radiation burden of electronic installation, and switching loss still exists.The improvement circuit that proposes has subsequently improved the loss of early stage circuit, is called as harmless LC breaking circuit.Then, the people such as N.H.Kut make improvements, and make it be more suitable for being applied to the DC-DC converter.
In passive soft on-off circuit in the past, mainly by input power U
i, main switch VT, fly-wheel diode VD, filter inductance L, filter capacitor C, load resistance R becomes with the resonance loop sets.Resonant tank comprises buffer inductance L
r, energy storage inductor L
s, buffer capacitor C
r, storage capacitor C
s, fast recovery diode VD
1, VD
2, VD
3During circuit working, by buffer inductance L
rThe current-rising-rate that suppresses main switch VT has realized the zero current passing of main switch VT, by buffer capacitor C
rIt is zero that discharge reaches main switch VT both end voltage, has realized that the no-voltage of main switch VT is turn-offed, and with buffer inductance L
rWith the buffering capacitor C
rThe energy feedback that stores in the course of the work is to input power U
iInput, the switch motion that reaches main switch VT be harmless effect almost.
Adopt the soft switch circuit of similar principles, there are the following problems: the maximum voltage stress on the main switch VT is input voltage and capacitor C
sThe voltage at two ends and, increased extra voltage stress.
Summary of the invention
The object of the invention is to propose a kind of electrical energy conversion circuit of Buck converter of minimum stress passive and nondestructive.
The object of the present invention is achieved like this:
A kind of soft switch circuit of the present invention comprises input power (U
i), main switch (VT), fly-wheel diode (VD), filter inductance (L), filter capacitor (C), load resistance (R) and resonant tank, it is characterized in that: resonant tank is by buffer inductance (L
r), buffer capacitor (C
r), energy storage inductor (L
s), storage capacitor (C
s), the first fast recovery diode (VD
1), the second fast recovery diode (VD
2), the 3rd fast recovery diode (VD
3), the 4th fast recovery diode (VD
4) consist of, wherein, buffer inductance (L
r) an end and the first fast recovery diode (VD
1) negative electrode be connected the other end and the second fast recovery diode (VD
2) negative electrode be connected; Buffer capacitor (C
r) an end respectively with the first fast recovery diode (VD
1), the second fast recovery diode (VD
2) anode be connected the other end and the 4th fast recovery diode (VD
4) anode be connected; Energy storage inductor (L
s) an end respectively with the first fast recovery diode (VD
1) and the second fast recovery diode (VD
2) anode be connected the other end and the 3rd fast recovery diode (VD
3) negative electrode be connected; Storage capacitor (C
s) an end and the second fast recovery diode (VD
2) negative electrode be connected, the other end respectively with the 3rd fast recovery diode (VD
3) anode, the 4th fast recovery diode (VD
4) negative electrode be connected.
Collector electrode C end and the input power (U of main switch (VT)
i) positive pole be connected the first fast recovery diode (VD in the emitter E end of main switch (VT) and the resonant tank
1) negative electrode be connected; The second fast recovery diode (VD in one end of filter inductance (L) and the resonant tank
2) negative electrode be connected, the other end is connected with load resistance (R), the other end of load resistance (R) and input power (U
i) negative pole be connected; The 4th fast recovery diode (VD in the resonant tank
4) anode and input power (U
i) negative pole be connected; Filter capacitor (C) is connected in parallel on load resistance (R) two ends; The second fast recovery diode (VD in one end of fly-wheel diode (VD) and the resonant tank
2) negative electrode be connected the 4th fast recovery diode (VD in the other end and the resonant tank
4) anode be connected.
Beneficial effect of the present invention is:
Circuit proposed by the invention introduces extra voltage stress can in range of operation main switch VT, and the maximum voltage on the main switch VT is input voltage.Simultaneously.Can guarantee to be stored in buffer inductance L
rOn energy at storage capacitor C
sBegin to discharge fully before the discharge, making does not have extra current stress on the main switch VT, effectively reduced the suffered stress of main switch, has increased its mean free error time, has improved the useful life of device.
Description of drawings
Fig. 1 is the basic principle figure of patent of the present invention;
Fig. 2 is the process chart of patent of the present invention.
Embodiment
Below in conjunction with accompanying drawing patent of the present invention is described further:
In conjunction with Fig. 1, buffer inductance L in the collector electrode C of main switch VT end and the resonant tank
rAn end and fast recovery diode VD
1Negative electrode be connected; Buffer inductance L in the end of filter inductance L and the resonant tank
rThe other end and storage capacitor C
sAn end be connected; Buffer capacitor C in the resonant tank
rAn end and fast recovery diode VD
4Anode and input power U
iNegative pole be connected; Series circuit one end and input power U that main switch VT, filter inductance L, load resistance R form
iPositive pole be connected the other end and input power U
iNegative pole be connected; Filter capacitor C is connected in parallel on load resistance R two ends; Fly-wheel diode VD is connected in parallel on the resonant tank two ends.In resonant tank, buffer inductance L
rVT connects with main switch, realizes the zero current turning-on of main switch VT, buffer capacitor C
rFully discharge before main switch VT turn-offs guarantees that main switch VT both end voltage when turn-offing is zero.Buffer inductance L
r, energy storage inductor L
s, buffer capacitor C
r, storage capacitor C
sWork in coordination with and carry out storage and the transfer of energy, realize the harmless of circuit.
In conjunction with Fig. 2, the execution mode of this patent of invention is as follows:
[t
0, t
1] be the main switch VT zero current passing stage.Main switch VT is at t
0Constantly conducting is because buffer inductance L
rExistence, suppressed to flow through the current-rising-rate of main switch VT, so that main switch VT realizes zero current passing.
[t
1, t
2] be C
rReseting stage.t
1Constantly begin capacitor C
rAnd C
sBy resonant tank C
r-L
r-C
s-VD
3-L
sCarry out the transfer of energy.
[t
2, t
3] be L
rReseting stage.Because C
rAt [t
1, t
2] stage is charged to input supply voltage U
i, so VD
1Conducting.Be stored in L
sIn energy by resonant tank VD
1-L
r-C
r-VD
3-L
sBe transferred to C
s
[t
3, t
4] be the circuit normal work stage.In this stage, buffer circuit does not participate in the course of work of circuit, and switching current keeps I
0Constant.
[t
4, t
5] be main switch VT no-voltage off-phases.t
5Main switch VT turn-offs constantly, because capacitor C
rOn voltage equal input supply voltage U
i, main switch VT both end voltage is zero, main switch VT realizes the no-voltage shutoff.Because C
sOn have voltage to suppress VD
2Conducting, so C
rBy loop C
r-VD
1-L
rTo load discharge.
[t
5, t
6] be L
rWith C
sResonance recovers the stage.C
rAnd C
sRespectively via VD
1-L
rAnd VD
4To load discharge.
[t
6, t
7] be C
sThe energy back stage.C
sContinue to pass through VD
4To load discharge.
[t
7, t
8] be C
rWith C
sEnergy continues feedback stage.C
rAnd C
sRespectively via VD
2And VD
4To load discharge.
[t
8, t
9] be the fly-wheel diode VD afterflow stage.This stage buffer circuit quits work, and circuit enters the normal afterflow stage of fly-wheel diode of Buck converter, until main switch VT is next time open-minded.
Claims (2)
1. a soft switch circuit comprises input power (U
i), main switch (VT), fly-wheel diode (VD), filter inductance (L), filter capacitor (C), load resistance (R) and resonant tank, it is characterized in that: resonant tank is by buffer inductance (L
r), buffer capacitor (C
r), energy storage inductor (L
s), storage capacitor (C
s), the first fast recovery diode (VD
1), the second fast recovery diode (VD
2), the 3rd fast recovery diode (VD
3), the 4th fast recovery diode (VD
4) consist of, wherein, buffer inductance (L
r) an end and the first fast recovery diode (VD
1) negative electrode be connected the other end and the second fast recovery diode (VD
2) negative electrode be connected; Buffer capacitor (C
r) an end respectively with the first fast recovery diode (VD
1), the second fast recovery diode (VD
2) anode be connected the other end and the 4th fast recovery diode (VD
4) anode be connected; Energy storage inductor (L
s) an end respectively with the first fast recovery diode (VD
1) and the second fast recovery diode (VD
2) anode be connected the other end and the 3rd fast recovery diode (VD
3) negative electrode be connected; Storage capacitor (C
s) an end and the second fast recovery diode (VD
2) negative electrode be connected, the other end respectively with the 3rd fast recovery diode (VD
3) anode, the 4th fast recovery diode (VD
4) negative electrode be connected.
2. a kind of soft switch circuit according to claim 1 is characterized in that: collector electrode C end and the input power (U of main switch (VT)
i) positive pole be connected the first fast recovery diode (VD in the emitter E end of main switch (VT) and the resonant tank
1) negative electrode be connected; The second fast recovery diode (VD in one end of filter inductance (L) and the resonant tank
2) negative electrode be connected, the other end is connected with load resistance (R), the other end of load resistance (R) and input power (U
i) negative pole be connected; The 4th fast recovery diode (VD in the resonant tank
4) anode and input power (U
i) negative pole be connected; Filter capacitor (C) is connected in parallel on load resistance (R) two ends; The second fast recovery diode (VD in one end of fly-wheel diode (VD) and the resonant tank
2) negative electrode be connected the 4th fast recovery diode (VD in the other end and the resonant tank
4) anode be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101140626A CN102857091A (en) | 2012-04-18 | 2012-04-18 | Soft switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101140626A CN102857091A (en) | 2012-04-18 | 2012-04-18 | Soft switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102857091A true CN102857091A (en) | 2013-01-02 |
Family
ID=47403363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101140626A Pending CN102857091A (en) | 2012-04-18 | 2012-04-18 | Soft switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102857091A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201874A (en) * | 2014-09-05 | 2014-12-10 | 武汉永力睿源科技有限公司 | Lossless absorption circuit of switching power supply output rectifier tube and switching power supply |
| CN104201884A (en) * | 2014-09-15 | 2014-12-10 | 北京航天新风机械设备有限责任公司 | Soft-switching DC-DC (direct current-direct current) conversion circuit |
| CN105720836A (en) * | 2016-04-25 | 2016-06-29 | 南昌大学 | Rectifier circuit |
| CN109861573A (en) * | 2019-03-07 | 2019-06-07 | 苏州赛得尔智能科技有限公司 | A kind of low switching losses power inverter |
| CN112701896A (en) * | 2020-12-03 | 2021-04-23 | 佛山科学技术学院 | Lossless absorption soft switching circuit based on Buck |
| CN114236335A (en) * | 2021-12-02 | 2022-03-25 | 深圳威迈斯新能源股份有限公司 | Voltage stress detection circuit of switching tube of direct current conversion module and control method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6924630B1 (en) * | 2004-02-03 | 2005-08-02 | Lockheed Martin Corporation | Buck-boost power factory correction circuit |
| CN101795061A (en) * | 2010-03-03 | 2010-08-04 | 哈尔滨工业大学 | Passive lossless snubber circuit suitable for current source isolating full-bridge boost topology |
-
2012
- 2012-04-18 CN CN2012101140626A patent/CN102857091A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6924630B1 (en) * | 2004-02-03 | 2005-08-02 | Lockheed Martin Corporation | Buck-boost power factory correction circuit |
| CN101795061A (en) * | 2010-03-03 | 2010-08-04 | 哈尔滨工业大学 | Passive lossless snubber circuit suitable for current source isolating full-bridge boost topology |
Non-Patent Citations (1)
| Title |
|---|
| RIVER T.H.LI等: "A Passive Lossless Snubber Cell With Minimum Stress and Wide Soft-Switching Range", 《IEEE TRANSACTIONS ON POWER ELECTRONICS》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201874A (en) * | 2014-09-05 | 2014-12-10 | 武汉永力睿源科技有限公司 | Lossless absorption circuit of switching power supply output rectifier tube and switching power supply |
| CN104201874B (en) * | 2014-09-05 | 2017-06-13 | 武汉永力睿源科技有限公司 | The lossless absorption circuit and Switching Power Supply of a kind of Switching Power Supply output rectifying tube |
| CN104201884A (en) * | 2014-09-15 | 2014-12-10 | 北京航天新风机械设备有限责任公司 | Soft-switching DC-DC (direct current-direct current) conversion circuit |
| CN105720836A (en) * | 2016-04-25 | 2016-06-29 | 南昌大学 | Rectifier circuit |
| CN105720836B (en) * | 2016-04-25 | 2019-05-24 | 南昌大学 | A kind of rectification circuit |
| CN109861573A (en) * | 2019-03-07 | 2019-06-07 | 苏州赛得尔智能科技有限公司 | A kind of low switching losses power inverter |
| CN112701896A (en) * | 2020-12-03 | 2021-04-23 | 佛山科学技术学院 | Lossless absorption soft switching circuit based on Buck |
| CN114236335A (en) * | 2021-12-02 | 2022-03-25 | 深圳威迈斯新能源股份有限公司 | Voltage stress detection circuit of switching tube of direct current conversion module and control method thereof |
| CN114236335B (en) * | 2021-12-02 | 2023-07-18 | 深圳威迈斯新能源股份有限公司 | DC conversion module switching tube voltage stress detection circuit and control method thereof |
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| PB01 | Publication | ||
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130102 |