CN104201874B - The lossless absorption circuit and Switching Power Supply of a kind of Switching Power Supply output rectifying tube - Google Patents
The lossless absorption circuit and Switching Power Supply of a kind of Switching Power Supply output rectifying tube Download PDFInfo
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- CN104201874B CN104201874B CN201410452855.8A CN201410452855A CN104201874B CN 104201874 B CN104201874 B CN 104201874B CN 201410452855 A CN201410452855 A CN 201410452855A CN 104201874 B CN104201874 B CN 104201874B
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Abstract
The invention discloses the lossless absorption circuit that a kind of Switching Power Supply exports rectifying tube, including electric capacity, the first diode, the second diode and inductance；The cathode output end of one end connecting valve power rectifier circuit of electric capacity, the other end connects the negative electrode of the first diode, the cathode output end of the anode connecting valve power rectifier circuit of the first diode；The anode of the second diode connects the negative electrode of the first diode, and the negative electrode of the second diode connects one end of inductance；The other end connection output capacitance of inductance and the phase contact of outputting inductance.The present invention is using the most of energy in the equivalent inductance of stray inductance in capacitive absorption transformer leakage inductance and circuit, so that the due to voltage spikes on commutation diode is clamped, the dash current in absorbing circuit is effectively inhibited by inductance simultaneously, prevent larger current spike, whole circuit structure is simple, and the efficiency and reliability of power supply is effectively ensured.
Description
Technical field
The invention belongs to electric and electronic technical field, and in particular to a kind of Lossless Snubber electricity of Switching Power Supply output rectifying tube
Road and Switching Power Supply.
Background technology
In the circuits such as conventional normal shock, half-bridge, full-bridge, output commutation diode is operated in hard switching state, due to becoming
The presence of depressor leakage inductance and commutation diode series inductance, peak voltage can be produced when diode is turned off, and especially exported
In the case that voltage ratio is higher, the peak voltage may result in diode over-voltage breakdown.Below by taking full bridge rectifier as an example
Illustrate, when transformer secondary voltage is zero, four diodes of full bridge rectifier are all turned on, output inductor
Electric current is in nature freewheeling state；And when transformer secondary voltage change is high voltage, there is two two in full bridge rectifier
Pole pipe will be turned off, and two diodes continue to turn on, at this moment the equivalent inductance Lip of transformer leakage inductance and Diode series stray inductance
Begin to produce vibration with diode junction capacitance Cp, backward voltage spike very high can be produced in diode shutdown moment, may
Cause diode over-voltage breakdown.
In order to reduce the peak voltage on commutation diode, a kind of measure is to add RC absorbing circuits, circuit as shown in Figure 1,
The series arm of parallel connection one resistance R and electric capacity C on each diode.The effect of resistance R is to produce damping, absorbs voltage point
The resonant energy at peak；The effect of electric capacity C is that the size of C determines degree of absorption for resistance R dampings provide energy channel.In two poles
When pipe is reversely turned off, the energy in the equivalent inductance Lip of transformer leakage inductance and Diode series stray inductance is to diode junction electricity
Capacity charge, while also being charged to Absorption Capacitance C by absorption resistance R.Electric capacity C is bigger, and the voltage on electric capacity C is just smaller, i.e., and two
Peak voltage in pole pipe is just smaller.When the quick forward conduction of diode, electric capacity C is discharged by resistance R, and most of energy will
Consumption is on resistance R.Although RC absorbing circuits can effectively suppress the backward voltage spike of diode, it be it is lossy,
The power of loss is approximately Ps=Fs × C × Vclamp × Vclamp, and wherein Fs represents the switching frequency of diode；C represents suction
Receive the capacity of electric capacity；Vclamp represents the size of clamp voltage.Absorption Capacitance is bigger, and the loss on absorption resistance is bigger, absorbs
Resistance must select the larger resistance of power, can so influence miniaturization and the efficiency of power supply.
In order to reduce the peak voltage on diode, another measure is to add RCD absorbing circuits, circuit as shown in Figure 2.
RCD absorbing circuit operation principles are as follows, are analyzed so that outputting inductance is operated in continuous mode as an example：
First stage, when transformer secondary voltage is zero, 4 diodes D1, D2, D3, D4 of rectification circuit are used as output
The fly-wheel diode of inductance, is in conducting state, and the voltage on clamp capacitor C1 is equal to output voltage Vo；
Second stage, transformer T1 secondary voltages become and turn to high voltage Vs (on just lower negative), and D1, D4 continue to turn on, D2, D3
Shut-off, transformer leakage inductance and the equivalent inductance Lik of Diode series stray inductance and the junction capacity Cp of D2, D3 carry out resonance, when
When diode D2 cathode voltages reach electric power output voltage, clamp diode D5 conductings, electric capacity C1 participates in resonance, due to electric capacity C1
Cp is much bigger for Capacity Ratio junction capacity, so voltage is increased slightly on electric capacity C1, therefore diode D2, the voltage of diode D3 are electric
Hold C1 clampers, Lik terminates quickly with the resonance of Cp, C1, and the voltage stabilization of diode D2, diode D3 and electric capacity C1 is in transformation
The secondary output voltage Vs of device；
Phase III, transformer T1 secondary voltages become cancellation, diode D1, diode D2, diode D3, diode D4
It is both turned on, is outputting inductance afterflow, diode D5 is turned off, and electric capacity C1 is fed back to the part energy of absorption by resistance R1 defeated
Go out, on resistance R1, electric capacity C1 terminates electric discharge to another part energy loss soon, and electric capacity C1 voltage stabilizations are in output voltage
Vo；
Fourth stage, transformer T1 secondary voltages become and turn to high voltage-Vs (under just upper negative), the operation principle under the state
Become with transformer T1 secondary voltages as when turning to high voltage Vs (on just lower negative), will not be repeated here.
It is exactly above the Working state analysis of a cycle, it can be seen that, RCD absorbing circuits are also lossy, big portion
Power is divided still to be lost on resistance, the power of loss is approximately Ps=Fs × C × (Vs × Vs-Vo × Vo), but the work(being lost
Rate is smaller compared to RC absorbing circuits.
In sum, although RC, RCD absorbing circuit can reduce the peak voltage on commutation diode, all there is one
Setting loss consumes, and is unfavorable for ensureing power-efficient.
The content of the invention
To solve the problems, such as that prior art RC absorbs and RCD absorbing circuits have loss, the present invention provides a kind of switch electricity
The lossless absorption circuit and Switching Power Supply of source output rectifying tube, it is intended that both suppressing to export the spike electricity of commutation diode
Pressure, realizes Lossless Snubber again, fully ensures that power-efficient.
A kind of Switching Power Supply exports the lossless absorption circuit of rectifying tube, including electric capacity, the first diode, the second diode and
Inductance；
The cathode output end of one end connecting valve power rectifier circuit of electric capacity, the other end connects the moon of the first diode
Pole；
The cathode output end of the anode connecting valve power rectifier circuit of the first diode；
The anode of the second diode connects the negative electrode of the first diode and the phase contact of electric capacity, and the negative electrode of the second diode connects
Connect one end of inductance；
The outputting inductance of the other end connecting valve power rectifier circuit of inductance and the tie point of output capacitance.
Further, the electric capacity is an electric capacity or by multiple capacitances in series or is formed in parallel, the first diode, second
Diode is a diode or by multiple Diode series or is formed in parallel.
A kind of Switching Power Supply, including rectification circuit, outputting inductance and output capacitance, also including described Lossless Snubber electricity
Road.
Technique effect of the invention is embodied in：
The present invention optimizes clamp voltage by Absorption Capacitance, it is to avoid commutation diode bears larger due to voltage spikes；Pass through
Size of current in inductance optimization absorbing circuit, it is to avoid absorbing circuit bears larger current spike.Using energy of the invention very well
Ground suppresses the peak voltage of output commutation diode, and realizes Lossless Snubber, solves prior art RC absorptions and RCD absorbs electricity
There is loss in road, power-efficient and reliability is effectively ensured.
Brief description of the drawings
Fig. 1 is prior art RC absorbing circuit figures；
Fig. 2 is prior art RCD absorbing circuit figures；
Fig. 3 is the lossless absorption circuit figure that a kind of Switching Power Supply that the present invention is provided exports rectifying tube；
Fig. 4 is the lossless absorption circuit working timing figure that a kind of Switching Power Supply that the present invention is provided exports rectifying tube.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as additionally, technical characteristic involved in invention described below each implementation method
Not constituting conflict each other can just be mutually combined.
A kind of lossless absorption circuit of present invention Switching Power Supply output rectifying tube is as shown in figure 3, including the first electric capacity C1, the
One diode D5, the second diode D6 and the second inductance L2, the cathode output end of Switching Power Supply rectification circuit are sequentially connected first
The cathode output end of electric capacity C1, the negative electrode of the first diode D5, the anode of the first diode D5 and Switching Power Supply rectification circuit；Open
Close power rectifier circuit output capacitance and the phase contact of outputting inductance be sequentially connected inductance L2, the negative electrode of the second diode D6,
The negative electrode of the positive pole of the second diode D6 and the first diode D5.
Using the Switching Power Supply of above-mentioned lossless absorption circuit, including by a transformer T1 and four diode D1, D2,
100, outputting inductance L1 of rectification circuit, an output capacitance C2 and above-mentioned lossless absorption circuit of D3, D4 composition.
Using the work schedule and waveform of the Switching Power Supply of lossless absorption circuit of the present invention as shown in figure 4, below to each shape
State is analyzed.
Wherein, the equivalent inductance of Lik indication transformers T1 leakage inductances and other stray inductances；The secondary of Vs indication transformers T1
Voltage；C points are power supply output cathode；D points are power supply output negative pole；VA represents voltage of the A points to output negative pole, and VB represents B points
To the voltage of output negative pole；VAB represents the voltage on Absorption Capacitance C1；Vo represents the output voltage of power supply, i.e. C, D point-to-point transmission
Voltage.
Positive half cycle work schedule is as follows：
T0 moment, the secondary voltage of transformer T1 is changed into high level (on just lower negative), diode D1, D4 conducting, diode
D2, D3, D5, D6 are turned off.The junction capacity and C1, Lik resonance of Lik and D2, D3, D5, D6, because C1 is much larger than in rectification circuit
The junction capacity of diode D2 and D3, so VA, VB voltage rise rapidly, and the voltage VAB on C1 does not almost increase.
T1 moment, VB voltages rise to output voltage Vo, D6 conducting, and D2, D3, D5 are in off state.Due to C1
Junction capacity much larger than D2, D3, and L2 values are smaller, therefore energy major part in leakage inductance absorbed by C1, C1 voltages VAB by
It is cumulative big.The Main Function of L2 is to suppress the electric current in absorbing circuit, prevents current spike, causes device failure.
The T2 moment, D6 shut-offs, D2, D3, D5 are still within off state.Lik, C1, L2 resonance terminate, and VAB reaches highest
Voltage Vclamp, VA reach ceiling voltage VAmax=Vclamp+Vo.In the T2-T3 time periods, VAB is maintained at Vclamp, and
Lik, L2 can also continue resonance with the junction capacity of diode, because energy is smaller, so amplitude is smaller.
T3 moment, transformer secondary voltage vanishing, D5 conductings, D2, D3, D6 are off state, the spike that C1 absorbs
Energy feeds back to output by L1, D5, and VA voltages begin to decline.
T4 moment, C1 voltages drop to zero, the energy powering load stored on L1, C2.
T5 moment, the secondary voltage of transformer T1 is changed into high level (lower to bear just) again, starts negative half period work, bears half
The operation principle of Zhou Yuzheng half cycles is the same.
Clamp voltage can be optimized by the size for changing Absorption Capacitance C1, it is to avoid commutation diode bears larger voltage
Spike；The size of current in absorbing circuit can be optimized by the size for changing inductance L2, it is to avoid absorbing circuit bears larger
Current spike.
The electric capacity is an electric capacity or by multiple capacitances in series or is formed in parallel that the first diode, the second diode are
One diode by multiple Diode series or is formed in parallel.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, it is not used to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc., all should include
Within protection scope of the present invention.
Claims (3)
1. a kind of Switching Power Supply exports the lossless absorption circuit of rectifying tube, it is characterised in that including electric capacity, the first diode, the
Two diodes and inductance；
The cathode output end of one end connecting valve power rectifier circuit of electric capacity, the other end connects the negative electrode of the first diode；The
The cathode output end of the anode connecting valve power rectifier circuit of one diode；The anode of the second diode connects the first diode
Negative electrode and electric capacity phase contact, the negative electrode of the second diode connects one end of inductance；The other end connecting valve power supply of inductance
The outputting inductance of rectification circuit and the tie point of output capacitance, wherein, one end connecting valve power rectifier circuit of outputting inductance
Cathode output end, the other end of outputting inductance connects one end of output capacitance, the other end connecting valve power supply of output capacitance
The cathode output end of rectification circuit.
2. a kind of Switching Power Supply as claimed in claim 1 exports the lossless absorption circuit of rectifying tube, it is characterised in that the electricity
Hold for an electric capacity or by multiple capacitances in series or be formed in parallel, the first diode, the second diode be a diode or by
Multiple Diode series are formed in parallel.
3. a kind of Switching Power Supply, including rectification circuit, outputting inductance and output capacitance, it is characterised in that also including claim 1
Or the lossless absorption circuit described in 2：The electrode input end of the cathode output end of the rectification circuit and the lossless absorption circuit
Connection, the cathode output end of the rectification circuit is connected with the negative input of the lossless absorption circuit, the outputting inductance
One end be connected with the cathode output end of the rectification circuit, the other end of the outputting inductance and the lossless absorption circuit
Output end is connected, and one end of the output capacitance is connected with the output end of the lossless absorption circuit, the output capacitance it is another
One end is connected with the cathode output end of the rectification circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410452855.8A CN104201874B (en) | 2014-09-05 | 2014-09-05 | The lossless absorption circuit and Switching Power Supply of a kind of Switching Power Supply output rectifying tube |
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| CN201410452855.8A CN104201874B (en) | 2014-09-05 | 2014-09-05 | The lossless absorption circuit and Switching Power Supply of a kind of Switching Power Supply output rectifying tube |
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| CN104201874B true CN104201874B (en) | 2017-06-13 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106230246A (en) | 2016-09-22 | 2016-12-14 | 京东方科技集团股份有限公司 | A kind of circuit and Switching Power Supply and liquid crystal display drive circuit |
| CN106533183B (en) * | 2016-12-23 | 2019-03-26 | 天津大学 | High efficiency isolated DC full-bridge circuit |
| CN106602537B (en) * | 2017-02-28 | 2019-12-03 | 深圳市华星光电技术有限公司 | A kind of voltage absorpting circuit |
| CN110695503B (en) * | 2019-10-16 | 2024-05-28 | 深圳市佳士科技股份有限公司 | Rectifying circuit for inhibiting reverse peak voltage and air plasma cutting machine |
| CN114884376A (en) * | 2022-05-07 | 2022-08-09 | 西安微电子技术研究所 | Peak absorption circuit and method suitable for high-voltage output |
| CN117200561A (en) * | 2023-09-28 | 2023-12-08 | 深圳欧陆通电子股份有限公司 | Spike voltage control circuit and synchronous rectification switching power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202309502U (en) * | 2011-11-09 | 2012-07-04 | 美的集团有限公司 | Switching power supply circuit capable of absorbing inverse voltage peak |
| CN102857091A (en) * | 2012-04-18 | 2013-01-02 | 哈尔滨工程大学 | Soft switching circuit |
| CN203522525U (en) * | 2013-10-28 | 2014-04-02 | 南宁一举医疗电子有限公司 | X-ray machine power factor correction circuit based on passive lossless absorption circuit |
| CN204131384U (en) * | 2014-09-05 | 2015-01-28 | 武汉永力睿源科技有限公司 | A kind of Switching Power Supply exports lossless absorption circuit and the Switching Power Supply of rectifying tube |
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2014
- 2014-09-05 CN CN201410452855.8A patent/CN104201874B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202309502U (en) * | 2011-11-09 | 2012-07-04 | 美的集团有限公司 | Switching power supply circuit capable of absorbing inverse voltage peak |
| CN102857091A (en) * | 2012-04-18 | 2013-01-02 | 哈尔滨工程大学 | Soft switching circuit |
| CN203522525U (en) * | 2013-10-28 | 2014-04-02 | 南宁一举医疗电子有限公司 | X-ray machine power factor correction circuit based on passive lossless absorption circuit |
| CN204131384U (en) * | 2014-09-05 | 2015-01-28 | 武汉永力睿源科技有限公司 | A kind of Switching Power Supply exports lossless absorption circuit and the Switching Power Supply of rectifying tube |
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Denomination of invention: A lossless absorption circuit of switching power supply output rectifier and switching power supply Effective date of registration: 20220310 Granted publication date: 20170613 Pledgee: Guanggu Branch of Wuhan Rural Commercial Bank Co.,Ltd. Pledgor: WUHAN YONGLI RAYCO TECHNOLOGY Co.,Ltd. Registration number: Y2022420000055 |
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Denomination of invention: A Lossless Absorption Circuit for Switching Power Supply Output Rectifier and Switching Power Supply Effective date of registration: 20230327 Granted publication date: 20170613 Pledgee: Guanggu Branch of Wuhan Rural Commercial Bank Co.,Ltd. Pledgor: WUHAN YONGLI RAYCO TECHNOLOGY Co.,Ltd. Registration number: Y2023420000129 |
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