CN104201874A - Lossless absorption circuit of switching power supply output rectifier tube and switching power supply - Google Patents
Lossless absorption circuit of switching power supply output rectifier tube and switching power supply Download PDFInfo
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- CN104201874A CN104201874A CN201410452855.8A CN201410452855A CN104201874A CN 104201874 A CN104201874 A CN 104201874A CN 201410452855 A CN201410452855 A CN 201410452855A CN 104201874 A CN104201874 A CN 104201874A
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Abstract
The invention discloses a lossless absorption circuit of a switching power supply output rectifier tube. The lossless absorption circuit comprises a capacitor, a first diode, a second diode and an inductor. One end of the capacitor is connected with the positive output end of a switching power supply rectifier circuit, the other end of the capacitor is connected with the negative pole of the first diode, and the positive pole of the first diode is connected with the negative pole output end of the switching power supply rectifier circuit. The positive pole of the second diode is connected with the negative pole of the first diode, the negative pole of the second diode is connected with one end of the inductor, and the other end of the capacitor is connected with the connection point of output capacitance and output inductance. According to the lossless absorption circuit, the capacitor is used to absorb most energy of leakage inductance of a transformer and most energy of equivalent inductance of stray inductance in the circuit so that the voltage spike on the rectifier diodes is clamped. Meanwhile, impulse currents in the absorption circuit are effectively restrained by aid of the inductor so that large current spike is avoided. The lossless absorption circuit is simple in structure and effectively ensures efficiency and reliability of the power supply.
Description
Technical field
The invention belongs to electric and electronic technical field, be specifically related to a kind of lossless absorption circuit and Switching Power Supply of Switching Power Supply output rectifying tube.
Background technology
In the circuit such as conventional normal shock, half-bridge, full-bridge, output rectifier diode is operated in hard switching state, due to the existence of transformer leakage inductance and rectifier diode series inductance, in the time that turn-offing, diode can produce peak voltage, especially, in the situation that output voltage is higher, this peak voltage may cause diode over-voltage breakdown.Describe as an example of full bridge rectifier example below, in the time that transformer secondary voltage is zero, four whole conductings of diode of full bridge rectifier, output inductor electric current is in natural afterflow state; And in the time that transformer secondary voltage is changed to high voltage, in full bridge rectifier, there are two diodes to turn-off, two diodes continue conducting, at this moment the equivalent inductance Lip of transformer leakage inductance and diode series connection stray inductance just starts to produce vibration with diode junction capacitance Cp, 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 is to add RC absorbing circuit, circuit as shown in Figure 1, the series arm of a resistance R in parallel and capacitor C on each diode.The effect of resistance R is to produce damping, absorbs the resonant energy of due to voltage spikes; The effect of capacitor C is for resistance R damping provides energy channel, and the size of C determines degree of absorption.In the time that diode reverse is turn-offed, the energy in the equivalent inductance Lip of transformer leakage inductance and diode series connection stray inductance charges to diode junction capacitance, also by absorption resistance R, Absorption Capacitance C is charged simultaneously.Capacitor C is larger, and the voltage in capacitor C is just less, and the peak voltage on diode is just less.In the time of the quick forward conduction of diode, capacitor C is discharged by resistance R, and most of energy will consume in resistance R.Although RC absorbing circuit is the reverse voltage spike of twin zener dioder effectively, 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 be selected the resistance that power is larger, can affect like this miniaturization and the efficiency of power supply.
In order to reduce the peak voltage on diode, another kind of measure is to add RCD absorbing circuit, as shown in Figure 2 circuit.RCD absorbing circuit operation principle is as follows, is operated in continuous mode analyzes as example taking outputting inductance:
First stage, transformer secondary voltage is 1 o'clock, and 4 diode D1, D2 of rectification circuit, D3, D4 are as the fly-wheel diode of outputting inductance, and all in conducting state, the voltage on clamp capacitor C1 equals output voltage V o;
Second stage, transformer T1 secondary voltage is changed to high voltage Vs (on just lower negative), D1, D4 continues conducting, D2, D3 turn-offs, equivalent inductance Lik and the D2 of transformer leakage inductance and diode series connection stray inductance, the junction capacitance Cp of D3 carries out resonance, in the time that diode D2 cathode voltage reaches electric power output voltage, clamp diode D5 conducting, capacitor C 1 participates in resonance, due to capacitor C, 1 Capacity Ratio junction capacitance Cp is much bigger, so voltage slightly increases in capacitor C 1, therefore diode D2, the voltage of diode D3 is by capacitor C 1 clamper, Lik and Cp, the resonance of C1 finishes very soon, diode D2, the voltage stabilization of diode D3 and capacitor C 1 is at the secondary output voltage V s 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 turn-offs, and capacitor C 1 feeds back to output by resistance R 1 by the part energy of absorption, and part energy loss is in resistance R 1 in addition, capacitor C 1 finishes electric discharge soon, and capacitor C 1 voltage stabilization is at output voltage V o;
Fourth stage, transformer T1 secondary voltage is changed to high voltage-Vs (under just upper negative), and the operation principle under this state and transformer T1 secondary voltage are the same while being changed to high voltage Vs (on just lower bearing), do 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 that the power of loss is compared RC absorbing circuit is 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.
Summary of the invention
There is the problem of loss for solving prior art RC absorption and RCD absorbing circuit, the invention provides a kind of lossless absorption circuit and Switching Power Supply of Switching Power Supply output rectifying tube, its object is, both suppressed to export the peak voltage of rectifier diode, realize again Lossless Snubber, fully ensure power-efficient.
A lossless absorption circuit for Switching Power Supply output 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 anodic bonding Switching Power Supply rectification circuit of the first diode;
The negative electrode of anodic bonding the first diode of the second diode and the phase contact of electric capacity, the negative electrode of the second diode connects 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, described electric capacity is an electric capacity or by multiple capacitances in series or be formed in parallel, the first diode, the second diode are a diode or are formed by multiple diode serial or parallel connections.
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 invention is embodied in:
The present invention 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 present invention can suppress to export the peak voltage of rectifier diode well, and realize Lossless Snubber, has solved that prior art RC absorbs and RCD absorbing circuit exists the problem of loss, effectively ensures power-efficient and reliability.
Brief description of the drawings
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 provided by the invention;
Fig. 4 is the lossless absorption circuit working timing figure of a kind of Switching Power Supply output rectifying tube provided by the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.In addition,, in each execution mode of described the present invention, involved technical characterictic just can combine mutually as long as do not form each other conflict.
The lossless absorption circuit of a kind of Switching Power Supply output of the present invention rectifying tube as shown in Figure 3, comprise the first capacitor C 1, 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 negative electrode, the anode of the first diode D5 and the cathode output end of Switching Power Supply rectification circuit of the first capacitor C 1, the first diode D5 successively; The output capacitance of Switching Power Supply rectification circuit is connected the negative electrode of inductance L 2, the second diode D6, the positive pole of the second diode D6 and the negative electrode of the first diode D5 successively with the phase contact of outputting inductance.
Adopt the Switching Power Supply of above-mentioned lossless absorption circuit, comprise the rectification circuit 100 being formed by a transformer T1 and four diode D1, D2, D3, D4, outputting inductance L1, an output capacitance C2 and an above-mentioned lossless absorption circuit.
The work schedule of the Switching Power Supply of employing lossless absorption circuit of the present invention 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 the voltage of A point to output negative pole, and VB represents the voltage of B point to 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), diode D1, D4 conducting, and 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 in rectification circuit and D3, so VA, VB voltage rise rapidly, and voltage VAB on C1 does not almost increase.
In the T1 moment, VB voltage rises to output voltage V o, 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 therefore the energy major part 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 turn-offs, and D2, D3, D5 are still in off state.Lik, C1, L2 resonance finish, 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.
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 (lower negative on just) again, starts negative half period work, and negative half period is the same with the operation principle of half cycle just.
Can optimize clamp voltage by the size that changes Absorption Capacitance C1, avoid rectifier diode to bear larger due to voltage spikes; Can optimize the size of current in absorbing circuit by the size that changes 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, the first diode, the second diode are a diode or are formed by multiple diode serial or parallel connections.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. a lossless absorption circuit for Switching Power Supply output rectifying tube, 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 anodic bonding Switching Power Supply rectification circuit of the first diode; The negative electrode of anodic bonding the first diode of the second diode and the phase contact of electric capacity, the negative electrode of the second diode connects 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.
2. the lossless absorption circuit of a kind of Switching Power Supply output rectifying tube as claimed in claim 1, it is characterized in that, described electric capacity is an electric capacity or by multiple capacitances in series or be formed in parallel, the first diode, the second diode are a diode or are formed by multiple diode serial or parallel connections.
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.
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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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| CN104201874A true CN104201874A (en) | 2014-12-10 |
| CN104201874B CN104201874B (en) | 2017-06-13 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533183A (en) * | 2016-12-23 | 2017-03-22 | 天津大学 | Efficient isolation type DC full-bridge conversion circuit |
| CN106602537A (en) * | 2017-02-28 | 2017-04-26 | 深圳市华星光电技术有限公司 | Voltage absorption circuit |
| 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 |
| US10630166B2 (en) | 2016-09-22 | 2020-04-21 | Boe Technology Group Co., Ltd. | Circuit and switching power supply and liquid crystal display driving circuit |
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| 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10630166B2 (en) | 2016-09-22 | 2020-04-21 | Boe Technology Group Co., Ltd. | Circuit and switching power supply and liquid crystal display driving circuit |
| CN106533183A (en) * | 2016-12-23 | 2017-03-22 | 天津大学 | Efficient isolation type DC full-bridge conversion circuit |
| CN106602537A (en) * | 2017-02-28 | 2017-04-26 | 深圳市华星光电技术有限公司 | Voltage absorption circuit |
| 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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| Publication number | Publication date |
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| CN104201874B (en) | 2017-06-13 |
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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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Date of cancellation: 20230320 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 |