CN204131384U - A kind of Switching Power Supply exports lossless absorption circuit and the Switching Power Supply of rectifying tube - Google Patents
A kind of Switching Power Supply exports lossless absorption circuit and the Switching Power Supply of rectifying tube Download PDFInfo
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- CN204131384U CN204131384U CN201420513848.XU CN201420513848U CN204131384U CN 204131384 U CN204131384 U CN 204131384U CN 201420513848 U CN201420513848 U CN 201420513848U CN 204131384 U CN204131384 U CN 204131384U
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 30
- 230000000694 effects Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
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- 230000006641 stabilisation Effects 0.000 description 2
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- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
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Abstract
The utility model discloses lossless absorption circuit and Switching Power Supply that a kind of Switching Power Supply exports rectifying tube.This Switching Power Supply exports the lossless absorption circuit of rectifying tube, comprises 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.This Switching Power Supply, comprises rectification circuit, outputting inductance and output capacitance, and above-mentioned lossless absorption circuit.The utility model effectively inhibits the impulse current in absorbing circuit, prevents larger current spike, and whole circuit structure is simple, effectively ensures efficiency and the reliability of power supply.
Description
Technical field
The utility model belongs to electric and electronic technical field, is specifically related to lossless absorption circuit and Switching Power Supply that a kind of Switching Power Supply exports rectifying tube.
Background technology
In the circuit such as normal shock, half-bridge, full-bridge of routine, export rectifier diode and be operated in hard switching state, due to the existence of transformer leakage inductance and rectifier diode series inductance, peak voltage can be produced when diode turns off, especially, when output voltage is higher, this peak voltage may cause diode over-voltage breakdown.Be described for full bridge rectifier below, when transformer secondary voltage is zero, four whole conductings of diode of full bridge rectifier, output inductor electric current is in nature freewheeling state; And when transformer secondary change in voltage is high voltage, two diodes are had to turn off in full bridge rectifier, two diodes continue conducting, at this moment the equivalent inductance Lip of transformer leakage inductance and Diode series stray inductance just starts to produce with diode junction capacitance Cp to vibrate, very high reverse voltage spike can be produced at diode shutdown moment, diode over-voltage breakdown may be caused.
In order to reduce the peak voltage on rectifier diode, a kind of measure adds RC absorbing circuit, circuit as shown in Figure 1, the series arm of a resistance R and electric capacity C in parallel on each diode.The effect of resistance R produces damping, absorbs the resonant energy of due to voltage spikes; The effect of electric capacity C is for resistance R damping provides energy channel, and the size of C determines degree of absorption.When diode reverse turns off, the energy in the equivalent inductance Lip of transformer leakage inductance and Diode series stray inductance charges to diode junction capacitance, is also charged to Absorption Capacitance C by absorption resistance R simultaneously.Electric capacity C is larger, and the voltage on electric capacity C is less, and the peak voltage namely on diode is less.When the quick forward conduction of diode, electric capacity C is discharged by resistance R, and most of energy will consume on resistance R.Although RC absorbing circuit can the reverse voltage spike of effective twin zener dioder, it is lossy, and the power of loss is approximately Ps=Fs × C × Vclamp × Vclamp, and wherein Fs represents the switching frequency of diode; C represents the capacity of Absorption Capacitance; Vclamp represents the size of clamp voltage.Absorption Capacitance is larger, and the loss on absorption resistance is larger, and absorption resistance must select the resistance that power is larger, can affect miniaturization and the efficiency of power supply like this.
In order to reduce the peak voltage on diode, another kind of measure adds RCD absorbing circuit, circuit as shown in Figure 2.RCD absorbing circuit operation principle is as follows, is operated in continuous mode analysis for outputting inductance:
First stage, when transformer secondary voltage is zero, 4 diodes D1, D2, D3, D4 of rectification circuit are as the fly-wheel diode of outputting inductance, and be all in conducting state, the voltage on clamp capacitor C1 equals output voltage Vo;
Second stage, transformer T1 secondary voltage is changed to high voltage Vs (on just lower negative), D1, D4 continues conducting, D2, D3 turns off, equivalent inductance Lik and the D2 of transformer leakage inductance and Diode series stray inductance, the junction capacitance Cp of D3 carries out resonance, when diode D2 cathode voltage reaches electric power output voltage, clamp diode D5 conducting, electric capacity C1 participates in resonance, because electric capacity C1 Capacity Ratio junction capacitance Cp is much bigger, so voltage slightly increases on electric capacity C1, therefore diode D2, the voltage of diode D3 is by electric capacity C1 clamper, Lik and Cp, the resonance of C1 terminates very soon, diode D2, the voltage stabilization of diode D3 and electric capacity C1 is at the secondary output voltage Vs of transformer,
Phase III, transformer T1 secondary voltage is changed to zero, diode D1, diode D2, diode D3, the equal conducting of diode D4, for outputting inductance afterflow, diode D5 turns off, and the part energy of absorption is fed back to output by resistance R1 by electric capacity C1, and part energy loss is on resistance R1 in addition, electric capacity C1 terminates electric discharge soon, and electric capacity C1 voltage stabilization is at output voltage Vo;
Fourth stage, transformer T1 secondary voltage is changed to high voltage-Vs (under just upper negative), the same when the operation principle under this state and transformer T1 secondary voltage are changed to high voltage Vs (on just lower bear), does not repeat them here.
It is exactly more than the Working state analysis of one-period, as can be seen here, RCD absorbing circuit is also lossy, and most of power or loss are on resistance, the power of loss is approximately Ps=Fs × C × (Vs × Vs-Vo × Vo), but the power of loss to compare RC absorbing circuit smaller.
In sum, although RC, RCD absorbing circuit all can reduce the peak voltage on rectifier diode, all there is certain loss, be unfavorable for ensureing power-efficient.
Utility model content
For solution prior art RC absorption and RCD absorbing circuit exist the problem of loss, the lossless absorption circuit that the utility model provides a kind of Switching Power Supply to export rectifying tube and Switching Power Supply, its object is to, both the peak voltage exporting rectifier diode had been suppressed, realize Lossless Snubber again, fully ensure power-efficient.
Switching Power Supply exports a lossless absorption circuit for rectifying tube, comprises 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 phase contact of electric capacity, and the negative electrode of the second diode connects one end of inductance;
The outputting inductance of other end connecting valve power rectifier circuit of inductance and the tie point of output capacitance.
Further, described electric capacity is an electric capacity or by multiple capacitances in series or be formed in parallel, and the first diode, the second diode are a diode or by multiple Diode series or be formed in parallel.
A kind of Switching Power Supply, comprises rectification circuit, outputting inductance and output capacitance, also comprises described lossless absorption circuit.
Technique effect of the present utility model is embodied in:
The utility model optimizes clamp voltage by Absorption Capacitance, avoids rectifier diode to bear larger due to voltage spikes; Optimize the size of current in absorbing circuit by inductance, avoid absorbing circuit to bear larger current spike.Application the utility model can suppress to export the peak voltage of rectifier diode well, and realizes Lossless Snubber, solves prior art RC and to absorb and RCD absorbing circuit exists the problem of loss, effectively guarantee power-efficient and reliability.
Accompanying drawing explanation
Fig. 1 is prior art RC absorbing circuit figure;
Fig. 2 is prior art RCD absorbing circuit figure;
Fig. 3 is the lossless absorption circuit figure of a kind of Switching Power Supply output rectifying tube that the utility model provides;
Fig. 4 is the lossless absorption circuit working timing figure of a kind of Switching Power Supply output rectifying tube that the utility model provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.In addition, if below in described each execution mode of the utility model involved technical characteristic do not form conflict each other and just can mutually combine.
A kind of Switching Power Supply of the utility model exports the lossless absorption circuit of rectifying tube as shown in Figure 3, comprise the first electric capacity C1, the first diode D5, the second diode D6 and the second inductance L 2, the cathode output end of Switching Power Supply rectification circuit connects the first electric capacity C1, the negative electrode of the first diode D5, the anode of the first diode D5 and the cathode output end of Switching Power Supply rectification circuit successively; The output capacitance of Switching Power Supply rectification circuit and the phase contact of outputting inductance are connected the negative electrode of the negative electrode of inductance L 2, second diode D6, the positive pole of the second diode D6 and the first diode D5 successively.
Adopt the Switching Power Supply of above-mentioned lossless absorption circuit, comprise by a transformer T1 and four rectification circuit that diode D1, D2, D3, D4 form 100, outputting inductance L1, an output capacitance C2 and above-mentioned lossless absorption circuit.
The work schedule of the Switching Power Supply of employing the utility model lossless absorption circuit and waveform as shown in Figure 4, are analyzed each state below.
Wherein, the equivalent inductance of Lik indication transformer T1 leakage inductance and other stray inductance; The secondary voltage of Vs indication transformer T1; C point is power supply output cathode; D point is power supply output negative pole; VA represents that A point is to the voltage of output negative pole, and VB represents that B point is 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. the voltage of C, D point-to-point transmission.
Positive half cycle work schedule is as follows:
In the T0 moment, the secondary voltage of transformer T1 becomes high level (on just lower negative), and diode D1, D4 conducting, diode D2, D3, D5, D6 turn off.The junction capacitance of Lik and D2, D3, D5, D6 and C1, Lik resonance, because C1 is much larger than the junction capacitance of diode D2 and D3 in rectification circuit, so VA, VB voltage rises rapidly, and the voltage VAB on C1 does not almost increase.
In the T1 moment, VB voltage rise is to output voltage Vo, D6 conducting, and D2, D3, D5 are still in off state.Because C1 is much larger than the junction capacitance of D2, D3, and L2 value is less, and the energy major part therefore in leakage inductance is absorbed by C1, and C1 voltage VAB increases gradually.The Main Function of L2 is the electric current in decrease uptake circuit, prevents current spike, causes device failure.
In the T2 moment, D6 turns off, and D2, D3, D5 are still in off state.Lik, C1, L2 resonance terminates, and VAB reaches ceiling voltage Vclamp, and VA reaches ceiling voltage VAmax=Vclamp+Vo.In the T2-T3 time period, VAB remains on Vclamp, and Lik, L2 also can continue resonance with the junction capacitance of diode, because energy is less, so amplitude is less.
In the T3 moment, the vanishing of transformer secondary voltage, D5 conducting, D2, D3, D6 are in off state, and the spike energy that C1 absorbs feeds back to output by L1, D5, and VA voltage starts to decline.
The T4 moment, C1 voltage drop to zero, the energy powering load of the upper storage of L1, C2.
In the T5 moment, the secondary voltage of transformer T1 becomes high level (on bearing down just) again, and start negative half period work, negative half period is the same with the operation principle of positive half cycle.
Can clamp voltage be optimized by the size changing Absorption Capacitance C1, avoid rectifier diode to bear larger due to voltage spikes; The size of current in absorbing circuit can be optimized by the size changing inductance L 2, avoid absorbing circuit to bear larger current spike.
Described electric capacity is an electric capacity or by multiple capacitances in series or be formed in parallel, and the first diode, the second diode are a diode or by multiple Diode series or be formed in parallel.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (3)
1. Switching Power Supply exports a lossless absorption circuit for rectifying tube, it is characterized in that, comprises 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 phase contact of electric capacity, and the negative electrode of the second diode connects one end of inductance; The outputting inductance of other end connecting valve power rectifier circuit of inductance and the tie point of output capacitance.
2. a kind of Switching Power Supply as claimed in claim 1 exports the lossless absorption circuit of rectifying tube, it is characterized in that, described electric capacity is an electric capacity or by multiple capacitances in series or be formed in parallel, and the first diode, the second diode are a diode or by multiple Diode series or be formed in parallel.
3. a Switching Power Supply, comprises rectification circuit, outputting inductance and output capacitance, it is characterized in that, also comprises the lossless absorption circuit described in claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420513848.XU CN204131384U (en) | 2014-09-05 | 2014-09-05 | A kind of Switching Power Supply exports lossless absorption circuit and the Switching Power Supply of rectifying tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420513848.XU CN204131384U (en) | 2014-09-05 | 2014-09-05 | A kind of Switching Power Supply exports lossless absorption circuit and the Switching Power Supply of rectifying tube |
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| CN204131384U true CN204131384U (en) | 2015-01-28 |
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| CN201420513848.XU Expired - Lifetime CN204131384U (en) | 2014-09-05 | 2014-09-05 | A kind of Switching Power Supply exports lossless absorption circuit and the Switching Power Supply of rectifying tube |
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Cited By (4)
| 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 |
| WO2018157458A1 (en) * | 2017-02-28 | 2018-09-07 | 深圳市华星光电技术有限公司 | Voltage absorption circuit |
| CN110098725A (en) * | 2019-06-19 | 2019-08-06 | 邢台子中电子科技有限公司 | A kind of DC power supply output rectification tube protective circuit and method |
| CN110695503A (en) * | 2019-10-16 | 2020-01-17 | 深圳市佳士科技股份有限公司 | Rectification circuit for inhibiting reverse peak voltage and air plasma cutting machine |
-
2014
- 2014-09-05 CN CN201420513848.XU patent/CN204131384U/en not_active Expired - Lifetime
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 |
| 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 |
| WO2018157458A1 (en) * | 2017-02-28 | 2018-09-07 | 深圳市华星光电技术有限公司 | Voltage absorption circuit |
| CN110098725A (en) * | 2019-06-19 | 2019-08-06 | 邢台子中电子科技有限公司 | A kind of DC power supply output rectification tube protective circuit and method |
| CN110695503A (en) * | 2019-10-16 | 2020-01-17 | 深圳市佳士科技股份有限公司 | Rectification circuit for inhibiting reverse peak voltage and air plasma cutting machine |
| 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 |
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Granted publication date: 20150128 |