CN106953510B - Switching device voltage spike active clamp driving circuit - Google Patents
Switching device voltage spike active clamp driving circuit Download PDFInfo
- Publication number
- CN106953510B CN106953510B CN201710180108.7A CN201710180108A CN106953510B CN 106953510 B CN106953510 B CN 106953510B CN 201710180108 A CN201710180108 A CN 201710180108A CN 106953510 B CN106953510 B CN 106953510B
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- Prior art keywords
- voltage
- switching device
- circuit
- spike
- active clamp
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/38—Means for preventing simultaneous conduction of switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to field of switch power, more particularly to a kind of switching device voltage spike clamper driving circuit.The circuit generates the driving signal of clamp circuit switch pipe using switching device itself spike and platform voltage is clamped, and clamping effect is good, high-efficient, circuit reduction, can all be applied popularization there are the application of switching device voltage spike.
Description
Technical field:
The present invention relates to field of switch power, drive electricity certainly more particularly to a kind of switching device voltage spike active clamp
Road.
Background technique
Switching Power Supply is the time ratio that control switch pipe turns on and off using modern power electronics technology, remains steady
Determine a kind of supply convertor of output voltage.For convenient for output voltage adjustment be isolated, transformer is in switching power converters
In be used widely.Isolating switch power be open and turn off by control switch pipe, high frequency chopping, input voltage is passed through
The form of high-frequency impulse reaches secondary side by high frequency transformer, becomes output DC voltage by rectifying and wave-filtering on secondary side.
In actual switch power supply main power circuit, due to parasitic inductance, the switch of the presence of parasitic parameter, such as wiring
The reverse recovery characteristic of device, parasitic inductance of transformer etc., can generate peak voltage at the shutdown moment of switching device.When
When being greater than the pressure voltage of switching device switching device overvoltage can damage this peak voltage.Therefore to the electricity at switching device both ends
Pointing peak needs take measures to be inhibited.
Common switching device voltage peak suppression method has RC absorption, RCD clamper and active clamp circuit；And wherein with
Active clamp circuit is maximally efficient to the inhibiting effect of due to voltage spikes.Due to voltage spikes active clamp circuit adds clamper MOS with capacitor
Based on pipe, more satisfactory due to voltage spikes clamping effect and smaller loss can be obtained.As shown in Figure 1, Q1 be need by
The main switching device of protection, capacitor C1 and clamper metal-oxide-semiconductor Q2 active clamp absorption circuit in series；Q2 can be PMOS tube,
As shown in Fig. 1 (a), or NMOS tube, as shown in Fig. 1 (b).Its working principle is that in main switching device Q1 shutdown, meeting
Due to voltage spikes is generated at the both ends Q1；When kurtosis reaches voltage on C1, the parasitic diode of clamper metal-oxide-semiconductor Q2 is connected, Q1 two
The due to voltage spikes at end can be by C1 voltage clamping, to realize effective inhibition to Q1 voltage；It carves in due course and opens clamper MOS
Pipe, can it is lossless release C1 on energy storage, reduce peak restrained caused by be lost.In field of switch power, active clamp circuit
It is maximally efficient to the due to voltage spikes inhibiting effect of switching device, but existing due to voltage spikes active clamp circuit generally existing two
The defect of a aspect: first aspect is that the driving signal of clamper metal-oxide-semiconductor Q2 is relatively difficult to obtain, and is especially diode rectification on secondary side
Perhaps from drive under conditions of just seem it is more difficult generally require increase auxiliary winding or from primary side transmit a signal to
Secondary side, which increase the complexity of design of transformer, the area of fabric swatch and difficulty, while also increasing cost；Second aspect is
Existing driving circuit scheme is often more complicated, and can generate unnecessary damage during generating final driving voltage
Consumption and heat.
Summary of the invention
The main purpose of the present invention is to provide a kind of new structural due to voltage spikes active clamp driving circuits, make it
It can be using the spike of switching device itself and platform voltage as source driving signal, by comparing simple driving circuit, control
The on-off of clamping switch tube processed is realized to the peak voltage clamper on main switching device and realizes the lossless of clamp capacitor voltage
Bleed off, peak restrained work well, and overall efficiency is high.
Technical solution of the present invention as shown in Fig. 2, comprising:
Main switching device Q1 (diode or metal-oxide-semiconductor)；
Clamp circuit, including capacitor C1 and metal-oxide-semiconductor Q2, clamp circuit it is in parallel with switching device；
Clamper tube opens decision circuitry, including divider resistance R1, R2 and auxiliary MOS transistor Q3
The charging of clamper tube driving voltage and service time initialization circuit, the driving circuit include resistance R3, R4, capacitor
C3, diode D1 and auxiliary burning voltage VCC.
The utility model due to voltage spikes clamper driving circuit at least has the advantage that in the technical program that clamper drives first
The spike and platform voltage that circuit uses switching device are as source driving signal, as long as that there are due to voltage spikes is anti-with platform for switching device
Pressure, can both realize the driving of active clamp circuit, and circuit occurs without dedicated driving signal, enormously simplifies source driving signal
It leads to the problem of；Clamper driving circuit simplifies simultaneously, only needs several devices that the generation of driving signal and driving voltage, letter can be realized
It is single reliable, it is that design, the difficulty of realization are reduced, and greatly reduce into the most simplified of available circuit in implementation method
This.
Detailed description of the invention
The invention patent is further illustrated with reference to the accompanying drawings and examples.
The active clamped peak absorbing circuit that 1 capacitor of attached drawing cooperates auxiliary MOS transistor to constitute
The switching device voltage spike active clamp driving circuit that 2 this patent of attached drawing is related to
The main waveform of 3 due to voltage spikes active clamp driving circuit of attached drawing
The working principle of active clamp driving circuit when attached drawing 4 has the switching device of due to voltage spikes to turn off
The working principle of active clamp driving circuit when attached drawing 5 has the switching device of due to voltage spikes to turn off
Due to voltage spikes active clamp driving circuit derived from 6 part of attached drawing
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention.It ties below
Conjunction is specifically illustrating, and the present invention is further explained.
The working principle of driving circuit shown in attached drawing 2 be using on switching device Q1 spike and platform voltage signal open
Logical and shutdown auxiliary Q2 pipe, to realize the purpose of lossless clamper main switch Q1 both end voltage spike using C1.
Attached drawing 3 gives main switching device Q1 both end voltage waveform and the drive waveforms of clamping switch tube Q2, does below in detail
Subdivision analysis.As shown in Fig. 4, when main switch Q1 is turned off, the DS both end voltage of Q1 is begun to ramp up；If do not apply clamper or its
His absorbing circuit, parasitic inductance coaxial main switch pipe Q1 parasitic capacitance generates oscillation in actual circuit design, forms due to voltage spikes,
It is as shown in phantom in Figure 3 without absorbing free oscillation spike；As it can be seen that generating the energy of due to voltage spikes from the storage with parasitic inductance
Can be related, it therefore, is said on ordinary meaning, parasitic inductance is bigger, and electric current is bigger, and main switch Q1 parasitic capacitance is smaller, voltage point
Peak is higher.Apply active clamp circuit after, when Q1 both end voltage rises to it is equal with the original voltage of clamp capacitor C1 when, clamper is opened
The conducting of pipe Q2 body diode is closed, Q1 both end voltage is by the original voltage clamping of C1；Q1 both end voltage passes through the partial pressure of R1 and R2 simultaneously
The both ends GS of Q3 are added in, suitably adjusting R1, R2 resistance value, Q3 is made to carve conducting in due course；Q3 conducting after, C3 both end voltage directly across
It connects at the both ends GS of Q2.Since C3 both end voltage is that a left side as shown in Figure 4 is positive right negative, to be applied to the both ends GS of PMOS tube Q2
Voltage is negative pressure, and Q2 is open-minded；Body diode is open-minded when opening in view of Q2, and Q2 practical is that no-voltage is open-minded.During this,
The practical parasitic capacitance in same C1 and Q1 of parasitic inductance carries out resonance, but since C1 is very big, and voltage is absorbing parasitic inductance storage
Voltage is basically unchanged when energy, is approximately a platform voltage, parasitic inductance energy storage fast linear under the effect of this voltage on waveform
Drop to zero or Switching Power Supply load current.Subsequently, as Q2 is connected, the upper energy storage of C1 can be released with Switching Power Supply load current
It puts；When voltage is equal to main switch Q1 platform voltage on to C1, C1 energy storage release terminates, and it is flat that C1 voltage maintains main switch Q1
Platform voltage.As it can be seen that loss is not present in the process in this in the conduction loss for ignoring switching device, absorbed for lossless clamper.Due to R4
Presence, after Q3 is opened, C3 is in parallel with R4, to C3 discharge；After the voltage of C3 is lower than the threshold voltage of Q2, Q2 shutdown.Suitably
Adjust the time constant of R4 and C3, the time of adjustable Q2 conducting.By being analyzed above it is found that Q2 is in each switch periods only portion
It is connected, can be simultaneously turned on to avoid Q2 and Q1 between timesharing, generate loss.
When main switch Q1 is opened, as shown in Fig. 5, the DS both end voltage of Q1 becomes being approximately zero, R1 and R2 in parallel, right
The GS capacitor of Q3 discharges, and turns off Q3；After Q3 shutdown, VCC is charged by R3 and D1 to C3, and C3 voltage is begun to ramp up.Q2 at this time
The both ends GS by D1 forward voltage clamper, be held off, until main switch Q1 is turned off next time.
Under certain particular job states, the driving circuit of due to voltage spikes active clamp described in this patent, it is understood that there may be
Part is derivative to improve circuit, as shown in Fig. 6.When Q1 turn-on time is especially short, less than the time constant of R4 and C3, exist at this time
Q1 conducting and Q2 the case where being not turned off；Energy storage on C1 at this time can be caused to be lost by Q1 forcible aborting.To ensure that Q2 is connected in Q1
When reliable turn-off, Q3 must Q1 be connected when reliable turn-off；Therefore, the both ends R1 can instead and diode D2.When Q1 conducting, due to
The presence of D2 can be such that Q3 rapidly switches off quickly to Q3 pipe GS parasitic capacitance discharge；Since C3 voltage is less than Vcc, the pass of Q3 forever
It is disconnected to can ensure that Q2 reliable turn-off.When Q1 both end voltage is higher, to reduce loss, R1 choosing value may be larger, will cause Q3 delay
Conducting；For this purpose, can accelerate to open speed in the both ends R1 shunt capacitance or capacitance resistance ware.If it is too fast that Q3 opens speed, Ke Nengzao
It is opened too early at Q2, discharges in advance C1, cause excess loss；It can be powered on and hold at the both ends pipe GS Q3, open timing to adjust Q3.
In addition, increase voltage-stabilizing device can be added at the both ends Q3 pipe GS to avoid Q3 pipe GS voltage beyond safe range, to ensure Q3 all
Reliability under operating condition.
Claims (6)
1. a kind of switching device voltage spike active clamp driving circuit is opened decision circuitry generation by clamping switch tube and is opened
Control logic is closed, control pushes the charging of clamper tube driving voltage and service time initialization circuit, controls in spike clamp circuit
Clamping switch tube realizes main switching device due to voltage spikes Lossless Snubber and inhibits that circuit includes:
A) main switching device in power conversion circuit, there are two states for the switching device: opening and turns off；When shutdown, device
Part both ends can generate due to voltage spikes and voltage platform；
B) spike clamp circuit, the clamping switch tube including clamp capacitor and series connection with it, clamp circuit and main switching device
It is in parallel；
C) clamping switch tube opens decision circuitry and includes charging resistor, driving storage capacitor, driving discharge resistance, clamper tube GS
The charging of clamper tube driving voltage and service time initialization circuit that diode and auxiliary burning voltage VCC are constituted.
2. a kind of switching device voltage spike active clamp driving circuit described in claim 1, it is characterised in that the pincers
Position pipe opens decision circuitry, including auxiliary MOS transistor, resistor voltage divider circuit.
3. a kind of switching device voltage spike active clamp driving circuit described in claim 1, it is characterised in that the pincers
Position pipe opens decision circuitry, increases parallel voltage-stabilizing device, between the GS of auxiliary MOS to ensure auxiliary MOS transistor GS voltage in safety
In range.
4. a kind of switching device voltage spike active clamp driving circuit described in claim 1, it is characterised in that the pincers
Position pipe opens decision circuitry, and upper divider resistance can increase anti-and diode, to ensure auxiliary MOS transistor reliable turn-off.
5. a kind of switching device voltage spike active clamp driving circuit described in claim 1, it is characterised in that the pincers
Position pipe open decision circuitry, lower divider resistance can increase shunt capacitance device, with adjust auxiliary MOS transistor open with shutdown when
Sequence.
6. a kind of switching device voltage spike active clamp driving circuit described in claim 1, it is characterised in that the pincers
Position pipe opens decision circuitry, using the due to voltage spikes and platform voltage at main switch both ends, generates switch output quantity, controls, pushes away
Dynamic clamper tube driving voltage charging and service time initialization circuit, control spike clamp circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710180108.7A CN106953510B (en) | 2017-03-23 | 2017-03-23 | Switching device voltage spike active clamp driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710180108.7A CN106953510B (en) | 2017-03-23 | 2017-03-23 | Switching device voltage spike active clamp driving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106953510A CN106953510A (en) | 2017-07-14 |
| CN106953510B true CN106953510B (en) | 2019-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710180108.7A Active CN106953510B (en) | 2017-03-23 | 2017-03-23 | Switching device voltage spike active clamp driving circuit |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11522439B2 (en) | 2020-01-16 | 2022-12-06 | Mediatek Inc. | Switching regulator with driver power clamp |
| CN114442714A (en) * | 2020-11-02 | 2022-05-06 | 圣邦微电子（北京）股份有限公司 | Novel clamp structure for Vgs of clamp PMOS |
| CN112671218B (en) * | 2020-12-24 | 2022-03-22 | 中国电子科技集团公司第四十三研究所 | Peak voltage suppression circuit of single-ended forward switching power supply diode |
| CN113885628A (en) * | 2021-08-26 | 2022-01-04 | 山东秉恬信息科技有限公司 | Integrated circuit control chip of intelligent water meter based on Internet of things |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002315334A (en) * | 2001-04-17 | 2002-10-25 | Sony Corp | Switching power supply circuit |
| US6822882B1 (en) * | 2003-08-01 | 2004-11-23 | Tyco Electronics Power Systems, Inc. | Gate driver with a DC offset bias circuit and a power converter employing the same |
| CN101019300A (en) * | 2005-08-11 | 2007-08-15 | 株式会社村田制作所 | Insulated switching power source device |
| CN104485831A (en) * | 2014-12-29 | 2015-04-01 | 杭州禾迈电力电子技术有限公司 | Leakage inductance energy absorption and feedback circuit of flyback transformer and control method thereof |
| CN104702110A (en) * | 2013-12-05 | 2015-06-10 | 联合汽车电子有限公司 | Active-clamp absorption circuit |
-
2017
- 2017-03-23 CN CN201710180108.7A patent/CN106953510B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002315334A (en) * | 2001-04-17 | 2002-10-25 | Sony Corp | Switching power supply circuit |
| US6822882B1 (en) * | 2003-08-01 | 2004-11-23 | Tyco Electronics Power Systems, Inc. | Gate driver with a DC offset bias circuit and a power converter employing the same |
| CN101019300A (en) * | 2005-08-11 | 2007-08-15 | 株式会社村田制作所 | Insulated switching power source device |
| CN104702110A (en) * | 2013-12-05 | 2015-06-10 | 联合汽车电子有限公司 | Active-clamp absorption circuit |
| CN104485831A (en) * | 2014-12-29 | 2015-04-01 | 杭州禾迈电力电子技术有限公司 | Leakage inductance energy absorption and feedback circuit of flyback transformer and control method thereof |
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| Publication number | Publication date |
|---|---|
| CN106953510A (en) | 2017-07-14 |
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