CN106452044A - Signal interlock circuit for preventing short circuit of APF (active power filter) driving circuits - Google Patents
Signal interlock circuit for preventing short circuit of APF (active power filter) driving circuits Download PDFInfo
- Publication number
- CN106452044A CN106452044A CN201611025114.7A CN201611025114A CN106452044A CN 106452044 A CN106452044 A CN 106452044A CN 201611025114 A CN201611025114 A CN 201611025114A CN 106452044 A CN106452044 A CN 106452044A
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- China
- Prior art keywords
- circuit
- signal
- apf
- input switching
- pulse
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- H02M1/38—Means for preventing simultaneous conduction of switches
- H02M1/385—Means for preventing simultaneous conduction of switches with means for correcting output voltage deviations introduced by the dead time
Abstract
The invention discloses a signal interlock circuit for preventing short circuit of APF (active power filter) driving circuits, and relates to the technical field of electric energy quality management. By the aid of the signal interlock circuit, technical problems of short circuit of lower driving circuits and the like during input pulse signal interlock failures in the prior art can be solved. The signal interlock circuit mainly comprises a first input switch circuit and a second input switch circuit. An interlock circuit can be formed by the first input switch circuit and the second input switch circuit, and first pulse signals or second pulse signals can be received by the first input switch circuit and the second input switch circuit; one of the first input switch circuit and the second input switch circuit is automatically gated by the first pulse signals or the second pulse signals, control pulses can be outputted to the lower APF driving circuits by the gated first input switch circuit or the gated second input switch circuit. The signal interlock circuit has the advantage that the signal interlock circuit can be used for preventing short circuit of IGBT (insulated gate bipolar transistor) driving modules of active power filters due to input signals.
Description
Technical field
The present invention relates to power quality controlling technical field and in particular to a kind of for prevent APF drive circuit short circuit
Signal interlock circuit.
Background technology
Advocating energy-saving today, electrical network power quality controlling particularly APF active filter extremely Related product
More and more paid attention to and applied, APF active filter (or APF drive circuit) is adopted ' I ' font three level IGBT more
Module, using pwm signal string resistance to isolation optocoupler former limit anode, isolation optocoupler negative electrode more than existing three level IGBT type of drive
The type of drive of ground connection, such IGBT module 1,3 pipes can only prevent from leading with the complementary mode in dead band by PWM drive signal simultaneously
Logical, if PWM is high level or isolation optocoupler anode by high level of interference after controller crashes, so that isolation optocoupler is led simultaneously
Logical, IGBT module 1,3 pipes so certainly will be led to simultaneously turn on, form short-circuit aircraft bombing, damage equipment, cause heavy economic losses.
Content of the invention
For above-mentioned prior art, present invention aim at providing a kind of signal for preventing the short circuit of APF drive circuit
Interlock circuit, solution prior art easily causes the technology such as lower bit driver circuit short circuit when the interlocking of input pulse signal was lost efficacy and asks
Topic.
For reaching above-mentioned purpose, the technical solution used in the present invention is as follows：
A kind of signal interlock circuit for preventing the short circuit of APF drive circuit, including
First input switching circuit and the second input switching circuit, constitute interlock circuit, and all receive the first pulse signal
Or second pulse signal；
The first described input switching circuit and the second input switching circuit, by the first pulse signal or the second pulse signal
From gating first, the first input switching circuit of gating or the second input switching circuit output control pulse drive to the next APF
Dynamic circuit.
In such scheme, the first described input switching circuit and the second input switching circuit, all include unidirectional circuit, respectively
Interlock from the control pulse that the electric current of unidirectional circuit is exported with it respectively；The electric current interlocking of described two unidirectional circuits.The present invention
Interlocking, the electrical quantity referring to a circuit or electric signal is presented as have or high, then another has interlocked relationship circuit with it
Or the electrical quantity of electric signal can only be presented as no or low, or refer to a circuit or electric signal electrical quantity be presented as no or
Low, then another has interlocked relationship circuit or the electrical quantity of electric signal can only be presented as have or high with it.
In such scheme, the first described pulse signal or the second pulse signal, select the pulse-width signal with dead band.
In such scheme, described the first input switching circuit, including
First voltage-stabiliser tube, its reversed pole receives the second pulse signal；
First diode, its high electrode connects the positive pole of the first voltage-stabiliser tube；
Second diode, its high electrode connects the low electrode of the first diode and its low electrode connects to the first pulse signal
Input potential point；
The same current potential of reversed pole of first resistor, its one end and the first voltage-stabiliser tube；
Second voltage-stabiliser tube, it connects the other end of first resistor and also with the high electrode of the first diode with electricity in pole in the same direction
Position, its reversed pole connects to the first pulse signal input potential point.
In such scheme, described APF drive circuit, including isolation optocoupler and drive circuit, drive circuit passes through isolation
Optocoupler receives and controls pulse.
In such scheme, the photoelectric tube high electrode of described isolation optocoupler connects pole in the same direction and low electrode to the second voltage-stabiliser tube
Connect to the reversed pole of the first voltage-stabiliser tube.
In such scheme, described the second input switching circuit, identical with the circuit structure of the first input switching circuit, and
It is used for the input of the first pulse signal or the second pulsed signal, same time producing with respect to same pulse signal
Road (one of the two input switching circuits) sense of current is contrary with the input of the first input switching circuit.
Compared with prior art, beneficial effects of the present invention：
Circuit of the present invention is after the wrong pwm signal of appearance, interference signal, due to the restriction of circuit structure of the present invention, all kinds of
Potential difference required for transistor turns no longer has, then immediately lead to isolation optocoupler and turn off, and no longer output drive signal makes
IGBT is switched to end by conducting, prevents described short-circuit conditions from occurring；
No matter how input pwm signal changes or comprise interference signal, be not in all 1,3 pipes due to IGBT module
Or 2,4 pipe all simultaneously turn on IGBT module short circuit aircraft bombing situation it is ensured that the safety of IGBT module, drastically increase equipment
Operational reliability.
Brief description
Fig. 1 is made up of the specific embodiment schematic diagram of interlock circuit for the present invention two input switching circuits；
Fig. 2 is the specific embodiment schematic diagram that Fig. 1 has interlock circuit during varying input signal relatively.
Specific embodiment
All features disclosed in this specification, or disclosed all methods or during step, except mutually exclusive
Feature and/or step beyond, all can combine by any way.
The present invention will be further described below in conjunction with the accompanying drawings：
Embodiment 1
The first described input switching circuit, including the first voltage-stabiliser tube Z2, its reversed pole receives the second pulse signal；First
Diode D2, its high electrode connects the positive pole of the first voltage-stabiliser tube Z2；Second diode D1, its high electrode connects the first diode
The low electrode of D2 and its low electrode connect and input potential point to the first pulse signal；First resistor R2, its one end and the first voltage stabilizing
The same current potential of reversed pole of pipe Z2；Second voltage-stabiliser tube Z1, its in the same direction pole connect first resistor R2 the other end and also with the one or two pole
The same current potential of high electrode of pipe D2, its reversed pole connects to the first pulse signal input potential point.Described APF drive circuit, bag
Include isolation optocoupler and drive circuit, drive circuit is received by isolation optocoupler and controls pulse.
Circuit of the present invention is related to four parts, referring to accompanying drawing 1,2 below.Part I is main controller pwm signal, at least
Comprise the pwm signal of 2 tunnels (2 multiples) 12V (or 15V)；Part II is PWM interlock circuit, including current-limiting resistance R1, R3,
Anti-interference resistance R2, R4, anti-interference voltage-stabiliser tube Z1, Z3, protection Zener diode Z2, Z4, protection diode D1, D2, D3, D4；
Part III is isolation optocoupler, bag optocoupler U1, U2；Part IV is power drive, including drive circuit and IGBT module.
Main controller PWM1 and PWM2 is the complementary PWM signals with dead band, that is,：When wherein one tunnel is 12V, another road is 0V.
Here not anti-first hypothesis PWM1 is 12V, and PWM2 is 0V, and now electric current I1 flows through optocoupler U1 by PWM1 through resistance R1, voltage-stabiliser tube Z1
Former limit flows back to PWM2, and optocoupler U1 turns on, and drive circuit 1 makes IGBT module 1 pipe turn on；Electric current I2 by PWM1 through voltage-stabiliser tube Z4, two
Pole pipe D4, diode D3, resistance R4 flow back to PWM2, and optocoupler U2 ends, and drive circuit 2 makes IGBT module 3 pipe end.Refer to figure
1.Conversely, PWM1 is 0V, PWM2 is 12V, now optocoupler U1 cut-off, and drive circuit 1 makes IGBT module 1 pipe end；Optocoupler U2 leads
Logical, drive circuit 2 makes IGBT module 3 pipe turn on.Please participate in Fig. 2.(IGBT module 2,4 pipe ON-OFF situations are identical with this, this
In no longer illustrate.)
Because main controller deadlock or interference signal lead to PWM1 identical with PWM2 polarity, that is,：When two-way is 12V or 0V, surely
Pressure diode Z1, Z3 cut-off, diode D1, D3 end so that optocoupler U1, U2 are turned off, and power driving circuit makes IGBT module
1st, 3 pipe all close short.
As described above, no matter pwm signal how to change or interference signal, be not in all IGBT module 1,3 pipe all with
The short-circuit conditions of Shi Kaitong are it is ensured that the safety of IGBT module.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any
Belong to those skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in, all answer
It is included within the scope of the present invention.
Claims (7)
1. a kind of signal interlock circuit for preventing the short circuit of APF drive circuit is it is characterised in that include
First input switching circuit and the second input switching circuit, constitute interlock circuit, and all receive the first pulse signal or the
Two pulse signals；
The first described input switching circuit and the second input switching circuit, free by the first pulse signal or the second pulse signal
Lead to first, the first input switching circuit of gating or the second input switching circuit output control pulse are electric to the next APF driving
Road.
2. a kind of signal interlock circuit for preventing the short circuit of APF drive circuit according to claim 1, its feature exists
In, the first described input switching circuit and the second input switching circuit, all include unidirectional circuit, the electric current of respective unidirectional circuit
The control pulse interlocking exporting with it respectively；The electric current interlocking of described two unidirectional circuits.
3. a kind of signal interlock circuit for preventing the short circuit of APF drive circuit according to claim 1 and 2, its feature
It is, the first described pulse signal or the second pulse signal, select the pulse-width signal with dead band.
4. a kind of signal interlock circuit for preventing the short circuit of APF drive circuit according to claim 1, its feature exists
In, described the first input switching circuit, including
First voltage-stabiliser tube, its reversed pole receives the second pulse signal；
First diode, its high electrode connects the positive pole of the first voltage-stabiliser tube；
Second diode, its high electrode connects the low electrode of the first diode and its low electrode connects to the first pulse signal input
Potential point；
The same current potential of reversed pole of first resistor, its one end and the first voltage-stabiliser tube；
Second voltage-stabiliser tube, its in the same direction pole connect first resistor the other end and also with the high electrode of the first diode same current potential, its
Reversed pole connects to the first pulse signal input potential point.
5. a kind of signal interlock circuit for preventing the short circuit of APF drive circuit according to claim 4, its feature exists
In, described APF drive circuit, including isolation optocoupler and drive circuit, drive circuit is received by isolation optocoupler and controls pulse.
6. a kind of signal interlock circuit for preventing the short circuit of APF drive circuit according to claim 5, its feature exists
In the photoelectric tube high electrode of described isolation optocoupler connects to the pole in the same direction of the second voltage-stabiliser tube and low electrode connects to the first voltage-stabiliser tube
Reversed pole.
7. a kind of signal interlock circuit for preventing the short circuit of APF drive circuit according to claim 1 or 6, its feature
It is, described the second input switching circuit, identical with the circuit structure of the first input switching circuit, and it is used for the first pulse
The same circuit sense of current and that the input of signal or the second pulsed signal produces with respect to same pulse signal
The input of one input switching circuit is contrary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611025114.7A CN106452044A (en) | 2016-11-22 | 2016-11-22 | Signal interlock circuit for preventing short circuit of APF (active power filter) driving circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611025114.7A CN106452044A (en) | 2016-11-22 | 2016-11-22 | Signal interlock circuit for preventing short circuit of APF (active power filter) driving circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106452044A true CN106452044A (en) | 2017-02-22 |
Family
ID=58221293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611025114.7A Pending CN106452044A (en) | 2016-11-22 | 2016-11-22 | Signal interlock circuit for preventing short circuit of APF (active power filter) driving circuits |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106452044A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109660239A (en) * | 2019-01-14 | 2019-04-19 | 武汉盛硕电子有限公司 | A kind of interlock circuit and application |
| WO2020118973A1 (en) * | 2018-12-13 | 2020-06-18 | 深圳市崧盛电子股份有限公司 | Signal isolation and conversion circuit and control apparatus |
| CN111614240A (en) * | 2020-06-04 | 2020-09-01 | 积成电子股份有限公司 | Full-bridge IGBT drive circuit and implementation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020118973A1 (en) * | 2018-12-13 | 2020-06-18 | 深圳市崧盛电子股份有限公司 | Signal isolation and conversion circuit and control apparatus |
| CN109660239A (en) * | 2019-01-14 | 2019-04-19 | 武汉盛硕电子有限公司 | A kind of interlock circuit and application |
| CN109660239B (en) * | 2019-01-14 | 2024-02-13 | 武汉盛硕电子有限公司 | Interlocking circuit and application |
| CN111614240A (en) * | 2020-06-04 | 2020-09-01 | 积成电子股份有限公司 | Full-bridge IGBT drive circuit and implementation method thereof |
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Application publication date: 20170222 |