CN106452034A - Active buffer network - Google Patents
Active buffer network Download PDFInfo
- Publication number
- CN106452034A CN106452034A CN201610877907.5A CN201610877907A CN106452034A CN 106452034 A CN106452034 A CN 106452034A CN 201610877907 A CN201610877907 A CN 201610877907A CN 106452034 A CN106452034 A CN 106452034A
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- Prior art keywords
- voltage
- electric capacity
- transformer
- diode
- buffer network
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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
- H02M1/34—Snubber circuits
-
- 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
- H02M1/34—Snubber circuits
- H02M1/342—Active non-dissipative snubbers
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides an active buffer network and belongs to the field of electronic circuits. The active buffer network comprises two diodes, a first capacitor C1, a second capacitor C2, a switch tube Q and a flyback transformer T, wherein the first end and the fourth end of the flyback transformer T are dotted terminals of a primary side and a secondary side; a positive electrode of a first diode D1 is connected with one end of a to-be-protected element, and a negative electrode of the first diode D1 is connected with one end of the capacitor C1 and the first end of the flyback transformer T; the second end of the capacitor C1 is connected with an emitter of the switch tube Q and the other end of the to-be-protected element; a collector of the switch tube Q is connected with the second end of the transformer T; the third end of the secondary side of the transformer T is connected with the positive electrode of the diode D2; the fourth end of the secondary side of the transformer T is connected with the second end of a voltage-stabilizing capacitor C2; the negative electrode of the diode D2 is connected with one end of the capacitor C2; and the second capacitor C2 is the voltage-stabilizing capacitor and is connected with other active or passive network for outputting energy. The buffer network is relatively safe and high in stability; redundant power can be repeatedly utilized; and the resource utilization rate is improved.
Description
Technical field
The invention belongs to electronic circuit field, it is related to Switching Power Supply and utilizes.
Background technology
Also known as absorbing circuit, it is a kind of important protection electricity of power electronic devices to the buffer circuit of power electronic devices
Road, is applied not only to the protection of half control type device, and at wholly-controled device (as GTR, GTO, power MOSFET and IGBT etc.)
Play an important role in application technology.In Power Electronic Circuit, turn on and off the moment for improving power electronic devices
The voltage that born, current waveform.Generally the power electronic devices in power electronic equipment all works on off state, device
Turn on and off and instantaneously do not complete.When device is just opened, the equiva lent impedance of device is big, if device current goes up quickly
Rise, will result in very big turn-on consumption；, close to when complete switching off, the electric current also ratio of device is larger, if device for same device
The voltage bearing rises rapidly, will also result in very big turn-off power loss.Switching loss can lead to the heating of device even to damage, right
In power transistor it is also possible to lead to the second breakdown of device.The Main Function of buffer circuit has：One is to reduce on or off
Loss；Two is to reduce voltage or current spike；Three is to reduce dV/dt or dI/dt.Good buffer circuit for operating frequency high from
Turn off device, by pressure limiting, current limliting, suppression di/dt and du/dt, switching loss is transferred to buffer circuit from device inside
Go, be then depleted on the resistance of buffer circuit again, or manage to feed back in power supply again by buffer circuit.
In order to absorb electric energy, go to consume unnecessary electric energy frequently with a resistance and electric capacity parallel connection at present, that is, RCD absorbs electricity
Road, as shown in Figure 2.The absorbing circuit of electric capacity C and diode composition can suppress the climbing dv/dt of voltage during switch off current.R
Provide discharge path for electric capacity C.This buffer network is energy consumption type buffer network, and the method can reach the purpose of buffering.
Less big in the capacity of power electronic devices, under the also less high occasion of operating frequency, this circuit is widely used.In Large Copacity
Circuit in, energy consumption type buffer network does not often reach requirement.And the loss ratio of this buffer network energy is more, unnecessary
Electric energy is consumed by resistance heating completely, and requires the Performance comparision height of resistance, and performance does not reach and is susceptible to danger.
Content of the invention
It is an object of the invention to：On the basis of energy consumption type buffer network, go to inhale with single-ended reverse exciting circuitry instead resistance
Receive the unnecessary electric energy of electric capacity C1 in buffer circuit, and the electric energy in buffer network is added to working power again by backfeed loop
In.
When the electric capacity C1 energy comparison height in buffer network needs release, the present invention does not need to be disappeared with resistance heating
Consume energy, but absorbed with active circuit of reversed excitation, and feed back in power supply.So both can protect operating circuit from pass
Disconnected device, reach the purpose of buffering, its stability can be increased again, reduce the generation of security incident, can also be many absorb
Complementary energy feeds back in power supply, improves energy utilization rate.
The present invention is to be realized using following technological means：
A kind of active buffer (as shown in Figure 1) network include flyback transformer T, switching tube Q, diode D1, diode D2,
First electric capacity C1, the second electric capacity C2, a feedback circuit.The positive pole of diode D1 is connected with needing element one end to be protected,
The negative pole of D1 is connected with one end of electric capacity C1, the former limit dotted end of transformer T.The other end of the first electric capacity C1 is with switching tube Q's
Emitter stage, the need element other end to be protected are connected.Dotted end is not connected the colelctor electrode of switching tube Q with transformer T former limit.Transformation
Dotted end is not connected device T secondary with diode D2 positive pole, and the secondary dotted end of transformer T is connected with second electric capacity C2 one end.Two
Pole pipe D2 negative pole is connected with the second electric capacity C2 other end.It is characterized in that devise being absorbed in buffer circuit with single-ended reverse exciting circuit
Unnecessary electric energy and non-electrical resistance consume.And the electric energy that single-ended reverse exciting circuit absorbs can feed back in working power.
Described buffer network absorbed power is P (80W-200W).
This method specifically includes：
When in buffer circuit, capacitor C1 voltage reaches V1 (300V-500V), switching tube Q is triggered, and with frequency is
The continuous closed and disconnected of 20KHZ.
When Q closes, the electric energy in electric capacity C1 is converted into the magnetic energy in transformer T, and transformer secondary does not have electric current to pass through.
When Q disconnects, in transformer T, magnetic energy is converted into electric energy, can regard that inductance charges to constant voltage electric capacity C2 as.
When electric capacity C2 absorbs excessive electric energy, electric energy feeds back to work electricity after passing through the flow process such as rectification, step-down, inversion
In the power supply on road, realize recycling of the energy.
The voltage at transformer C1 two ends is V1, when the voltage at constant voltage electric capacity C2 two ends is V2 (500V-600V), if duty
For 50%, the ratio of flyback transformer primary and secondary side winding is Np to ratio:In the case of Ns=k (0.5-2), circuit waveform figure such as Fig. 3
Shown：
From figure 3, it can be seen that when switching tube Q turns on, the voltage that diode D2 bears is C1 voltage and constant voltage electric capacity electricity
Pressure C2 sum, the speed that primary current rises is V1/L, and secondary does not have electric current to pass through.
When switching tube Q closes, the voltage that switching tube bears is C1 voltage and constant voltage capacitance voltage C2 sum, and former limit does not have
Electric current, secondary current decrease speed V2/L.In the case that dutycycle is 50%, the energy being stored in transformer is completely permissible
Discharged before next cycle starts.
Buffer circuit concrete operating principle：
The operation principle of buffer circuit is as shown in Figure 4.Need components and parts two ends to be protected and on diode D1 and
First electric capacity C1, the first electric capacity C1 two ends connect transformer for absorb the first electric capacity C1 on electric energy, transformer and parallel connection
The second electric capacity C2 provide discharge path for C1, prevent excessive electric energy from damaging components and parts.Transformer T is connected in parallel on the first electric capacity
C1 two ends, and add a switching tube Q in primary circuit, control the break-make of primary circuit.Transformer secondary circuit and one
Second electric capacity C2 is connected, and the diode D2 that connects in secondary circuit.Switching tube Q is by pwm pulse as can be seen from Figure 4
When encouraging and turning on, input voltage will be applied in the primary side winding of transformer, due to the commutation diode of transformer T secondary
D2 reversal connection, vice-side winding does not have electric current pass through；When switching tube Q turns off, voltage polarity reversal on vice-side winding, rectification two pole
, by positively biased, switching tube Q is stored in transformer energy during closing will be by commutation diode D2 to the second electric capacity for pipe D2
C2 discharges.This converter storage energy during pipe Q conducting of opening the light, just to electric capacity transmission during ending, transformer exists
It is that transformer is equivalent to an energy storage inductor again in the course of work.
The feedback of energy in second electric capacity C2：
Because the electric energy in transformer is continuously discharged in the second electric capacity C2, the electric energy in the second electric capacity C2 is not
Disconnected increase, therefore increases a feedback circuit, on the power supply in operating circuit for the energy back in the second electric capacity C2, to reach
Scheme the purpose with 3 to repeating profit.Because not having obvious energy loss in circuit, the fraction loss of only each components and parts,
So energy loss is especially few.
Brief description
Fig. 1 is a kind of active buffer network
Fig. 2 is RCD buffer network
Fig. 3 is circuit waveform figure.
Fig. 4 is the operation principle of buffer circuit.
Fig. 5 is the application in secondary inverting with regard to buffer network.
Fig. 6 is specific embodiment two buffer network.
Fig. 7 is double-transistor flyback circuit.
Specific embodiment
Specific embodiment one
It is illustrated in figure 5 the application with regard to buffer network in secondary inverting, be buffer network wherein in dotted line frame, including one
Secondary inverter circuit, rectification circuit, secondary inverter circuit, buffer circuit and drive circuit, inverter circuit, a secondary inverting electricity
Road is prior art.Buffer network is added to resistance two ends and is used for protecting Q5 and Q6.
Q5 turns off to as a example Q6 conducting conversion, when Q5 turns off, if not having leakage inductance L1 ', the energy on inductance L1 can be completely
Be coupled to and discharge on L2, but be because leakage inductance L1 ' energy can not to be coupled on L2 be to bleed off, at this moment due to the afterflow of inductance
Effect, by the junction capacity charging to Q5, junction capacity very little two ends can produce very high voltage to the energy on inductance, and junction capacity is got over
Little both end voltage is higher, thus may breakdown switch pipe Q5, so research and design absorbs leakage with active buffer network of network
Inductance energy, reduces the impact of leakage inductance voltage switch tube Q5.
As shown in figure 5, when Q5 turns off, collector voltage begins to ramp up, and electric capacity C2 limits the upper of collector voltage
Lifting speed, reduces the overlap of raised voltage and drop-out current simultaneously, thus reducing the loss of switching tube Q5.C2 is used for absorbing
The unnecessary electric energy in Q5 two ends, when the voltage at C2 two ends is less than V1 (350V-450V), diode Q7 disconnects, and C2 both end voltage can
To ramp.When C2 both end voltage is more than V1, Q7 starts working, and with the continuous closed and disconnected of the frequency of 20KHZ, until
C2 both end voltage is less than V1.Electric energy in the transformer T2 Absorption Capacitance C2 when Q7 closes, when Q6 closes, primary circuit is led
Logical, primary side winding has electric current to pass through, and due to the commutation diode D6 reversal connection of transformer T2 secondary, vice-side winding does not have electric current lead to
Cross.When Q7 closes, voltage polarity reversal on vice-side winding, by positively biased, switching tube Q7 stores during closing commutation diode D6
Energy in transformer will be discharged to electric capacity C3 by commutation diode D6.Because C3 is constant voltage electric capacity, therefore voltage will not
Raise.
In Fig. 5, the drive circuit of Q7 is used for detecting the voltage at C2 two ends.In U1, reference voltage Vref is set to V1, and U2 is defeated
Enter triangular signal, when the voltage at C2 two ends is more than V1, U1 has signal, thus driving switch pipe Q7, T2 starts to absorb and release
Exoergic amount, so that the voltage at C2 two ends is less than V1.C3 is electric capacity of voltage regulation, and when Q7 closes, the energy in transformer T2 is released
It is put in C3, the energy in C3 can feed back in power supply again, realize the recycling of energy.Switching tube Q7 is due to power ratio
Relatively low, just can reach protective effect with the RCD buffer network shown in Fig. 2.
Specific embodiment two
It is illustrated in figure 6 the application with regard to buffer network in welding machine, be buffer network wherein in dotted line frame.Including main electricity
Road, buffer circuit and drive circuit, wherein main circuit of the welding machine and drive circuit are prior arts.Buffer network is added to switching tube two
End is with protection switch pipe.Concrete buffer network is as shown in Figure 6.
As shown in fig. 6, when Q1 turns off, collector voltage begins to ramp up, and electric capacity C2 limits the upper of collector voltage
Lifting speed, reduces the overlap of raised voltage and drop-out current simultaneously, thus reducing the loss of switching tube Q1.C2 is used for absorbing
The unnecessary electric energy in Q1 two ends, when the voltage at C2 two ends is less than V1 (350V-450V), diode Q3 disconnects, and C2 both end voltage can
To ramp.When C2 both end voltage is more than V1, Q3 starts working, and with the continuous closed and disconnected of the frequency of 20KHZ, until
C2 both end voltage is less than V1.Electric energy in the transformer Absorption Capacitance C2 when Q3 closes, when Q3 closes, primary circuit turns on,
Primary side winding has electric current to pass through, and due to the commutation diode D2 reversal connection of transformer secondary, vice-side winding does not have electric current pass through.When
When Q3 closes, voltage polarity reversal on vice-side winding, commutation diode D2 is stored in transformation by positively biased, switching tube Q3 during closing
Energy in device will be discharged to electric capacity C3 by commutation diode D2.Because C3 is constant voltage electric capacity, therefore voltage will not raise
In Fig. 6, Vref is set as V1, and when the voltage at C2 two ends is more than V1, drive circuit is started working, and switching tube Q3 leads
Logical, buffer network is started working.When Q3 disconnects, the energy absorbing in electric capacity of voltage regulation C3 can feed back in main circuit, it is to avoid
Extra powering up again has reclaimed energy simultaneously.
Specific embodiment three
Embodiment three is to replace single tube single-ended reverse exciting circuit with two-tube single-ended reverse exciting circuit, and wherein double-transistor flyback circuit is
Existing technology.Components and parts two ends to be protected parallel connection one diode D1 and electric capacity C1, C1 two ends connect Q1, D2, D3,
Tetra- components and parts of Q2 constitute twin-tube circuit.Double-transistor flyback circuit is as shown in Figure 7.
The positive pole of diode D1 is connected with needing element one end to be protected, one end of the negative pole of D1 and electric capacity C1, Q1
Colelctor electrode, the negative pole of D2 are connected.The other end of electric capacity C1 and the need element other end to be protected, the positive pole of diode D3, switch
The emitter stage of pipe Q2 is connected.Dotted end, the negative pole of diode D3 are not connected for the colelctor electrode of switching tube Q1 and transformer T former limit.Become
Dotted end is not connected depressor T former limit with the colelctor electrode of diode D2 positive pole, switching tube Q2.The secondary dotted end of transformer T with steady
Voltage capacitance C2 one end is connected, secondary not dotted end and diode D4 positive pole, diode D4 negative pole and the electric capacity of voltage regulation C2 of transformer T
The other end be connected.
During double-transistor flyback normal circuit operation, Q1, Q2 turn on and off simultaneously.When Q1, Q2 open, D2, D3, D4 end,
DC input voitage is added in transformer T former limit, and primary side current of transformer linear rise is to maximum.When Q1, Q2 turn off, transformation
Device primary and secondary side polarity of voltage is reverse.It is both turned in Q1, Q2 shutdown moment D2, D3, D4, D2, D3 turn on transformer primary side
Some energy, in input voltage, is now fed back to input voltage source by D2, D3 by voltage clamping, and D4 turns on transformer
The energy of former limit magnetizing inductance storage shifts to output loading, and the voltage clamping of former limit magnetizing inductance is reflected in output voltage
Voltage to former limit.After a period of time, D2, D3 end, and the energy of transformer primary side inductance storage all shifts to output loading.
Some occasions adopt common single switch flyback power supply, and the voltage stress that switching tube is waited when off is excessive, in addition instead
The transformer of sharp power supply often has larger leakage inductance because adding air gap, leads to switching tube to produce very big voltage point when off
Peak.Double-transistor flyback power supply can overcome the excessive shortcoming of common flyback sourse switch tube voltage stress.When switching tube turns off, two
Individual fly-wheel diode by clamped for the ceiling voltage of switching tube in input voltage, now by some energy feedback to input voltage
Source is without being delivered to transformer secondary.
Active buffer network is not only single switch flyback circuit composition or double-transistor flyback circuit.Different fields can be regarded
Close and select the different buffer network of application.
Claims (4)
1. a kind of active buffer network it is characterised in that:
Including the first diode D1, the second diode D2, the first electric capacity C1, the second electric capacity C2, a switching tube Q, a flyback
Transformer T；In flyback transformer T, 1 end and 4 ends are the Same Name of Ends of primary and secondary side；The positive pole of the first diode D1 with need protect
Element one end of shield is connected, and the negative pole of D1 is connected with one end of the first electric capacity C1,1 end of flyback transformer T；First electric capacity C1's
Two ends are connected with the emitter stage of switching tube Q, the need element other end to be protected；The colelctor electrode of switching tube Q and 2 ends of transformer T
It is connected；Transformer T secondary 3 end is connected with the second diode D2 positive pole, secondary 4 end of transformer T and the second electric capacity C2 bis- end phase
Even；Second diode D2 negative pole is connected with second electric capacity C2 one end；Second electric capacity C2 be electric capacity of voltage regulation, the second electric capacity C2 with active
Or passive network is connected to export energy.
2. according to claim 1 a kind of active buffer network it is characterised in that：
Components and parts ceiling voltage to be protected is needed to be less than V1, when the voltage at the first electric capacity C1 two ends is less than voltage V1, buffering
Network does not work；When the first electric capacity C1 both end voltage is more than or equal to voltage V1, buffer network is started working；In buffer network
During work, adjust the switch time of switching tube Q thus adjusting the transmission speed of energy by adjusting dutycycle；Second electric capacity C2 electricity
Pressure value V2 is equal with external network voltage, and the breakdown voltage of switching tube Q is more than V1+V2, the breakdown reverse voltage of diode D2
Also greater than V1+V2.
3. according to claim 1 a kind of active buffer network it is characterised in that：
Described buffer network is applied in welding machine in order to protect the switching tube in welding machine.
4. according to claim 1 a kind of active buffer network it is characterised in that：
Single tube transforming circuit in buffer network changes two-tube transforming circuit into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610877907.5A CN106452034A (en) | 2016-10-03 | 2016-10-03 | Active buffer network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610877907.5A CN106452034A (en) | 2016-10-03 | 2016-10-03 | Active buffer network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106452034A true CN106452034A (en) | 2017-02-22 |
Family
ID=58172760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610877907.5A Pending CN106452034A (en) | 2016-10-03 | 2016-10-03 | Active buffer network |
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| Country | Link |
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| CN (1) | CN106452034A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116647112A (en) * | 2023-07-27 | 2023-08-25 | 深圳市恒运昌真空技术有限公司 | Converter based on active direct current buffer chain and control method thereof |
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| CN201509153U (en) * | 2009-08-14 | 2010-06-16 | 上海鹰泰德创电器电子有限公司 | Switching power supply |
| CN202652054U (en) * | 2012-07-09 | 2013-01-02 | 深圳市垅运照明电器有限公司 | Passive lossless snubber circuit suitable for single-tube flyback |
| CN102904450A (en) * | 2011-07-29 | 2013-01-30 | Tdk株式会社 | Current-fed isolation converter |
| US20140334194A1 (en) * | 2013-05-10 | 2014-11-13 | Marco Davila | Resonant Transition Controlled Flyback |
| CN104242621A (en) * | 2013-06-11 | 2014-12-24 | Abb研究有限公司 | Lc snubber circuit |
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2016
- 2016-10-03 CN CN201610877907.5A patent/CN106452034A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201509153U (en) * | 2009-08-14 | 2010-06-16 | 上海鹰泰德创电器电子有限公司 | Switching power supply |
| CN102904450A (en) * | 2011-07-29 | 2013-01-30 | Tdk株式会社 | Current-fed isolation converter |
| CN202652054U (en) * | 2012-07-09 | 2013-01-02 | 深圳市垅运照明电器有限公司 | Passive lossless snubber circuit suitable for single-tube flyback |
| US20140334194A1 (en) * | 2013-05-10 | 2014-11-13 | Marco Davila | Resonant Transition Controlled Flyback |
| CN104242621A (en) * | 2013-06-11 | 2014-12-24 | Abb研究有限公司 | Lc snubber circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116647112A (en) * | 2023-07-27 | 2023-08-25 | 深圳市恒运昌真空技术有限公司 | Converter based on active direct current buffer chain and control method thereof |
| CN116647112B (en) * | 2023-07-27 | 2024-02-20 | 深圳市恒运昌真空技术股份有限公司 | Converter based on active direct current buffer chain and control method thereof |
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| C06 | Publication | ||
| PB01 | Publication | ||
| CB03 | Change of inventor or designer information |
Inventor after: Huang Pengfei Inventor after: Lu Zhenyang Inventor after: Ding Bin Inventor after: Feng Wenchao Inventor after: Zhou Zhenguo Inventor before: Huang Pengfei Inventor before: Lu Zhenyang Inventor before: Ding Bin |
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| COR | Change of bibliographic data | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170222 |