CN204030548U - A kind of short-circuit protection circuit of frequency changer direct current bus - Google Patents
A kind of short-circuit protection circuit of frequency changer direct current bus Download PDFInfo
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- CN204030548U CN204030548U CN201420518193.5U CN201420518193U CN204030548U CN 204030548 U CN204030548 U CN 204030548U CN 201420518193 U CN201420518193 U CN 201420518193U CN 204030548 U CN204030548 U CN 204030548U
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Abstract
The utility model relates to protecting circuit for electrical equipment; be specifically related to a kind of short-circuit protection circuit of frequency changer direct current bus; it is characterized in that comprising more than one bold and unconstrained Europe resistance R1, resistance R2, R3, R4, R5, R6, more than one current-limiting resistance R7; PNP triode Q1, PNP triode Q2; NPN triode Q3, voltage stabilizing didoe ZD1, ZD2, photoelectrical coupler PC1; electric capacity C1, C2, C3, described photoelectrical coupler PC1 comprises light-emitting diode D1 and phototriode Q4.The short-circuit protection circuit of the frequency changer direct current bus that the utility model provides frequency converter short-circuited outside or DC bus current excessive time; can make a response within the extremely short time; turn off the output of IGBT drive circuit; thus make IGBT avoid burning out because of short circuit; without the need to adopting software detection; reliability is higher, and production cost is low, greatly reduces the maintenance cost of enterprise.
Description
Technical field
The utility model relates to protecting circuit for electrical equipment, is specifically related to a kind of short-circuit protection circuit of frequency changer direct current bus.
Background technology
In daily Electric Machine Control process, important role taken on by frequency converter.Motor in use, due to reasons such as artificial wiring error, the serious winding insulation damage of motor ages, control signal electromagnetic interference, be easy to cause frequency converter output short-circuit fault, transcient short circuit time electric current is very large, exceeds the running current scope of IGBT pipe.If the PWM that can not turn off frequency converter in official hour timely and effectively exports, IGBT pipe will be caused to burn out because of short circuit overcurrent.
Existing; the circuit of IGBT is protected during a kind of frequency converter output short-circuit disclosed in Authorization Notice No. CN 202749802 U; the detection mode adopted is voltage monitoring and current detecting mainly, and voltage detecting is by detecting the pressure drop of the collector and emitter of IGBT and then judging that IGBT is as straight-through or output short-circuit.The pressure drop of collector and emitter during short circuit carried out wherein comparing with the threshold value of setting, the output signal of comparator controls the shutoff of drive circuit.Current detecting, by detecting the size of current of DC bus, compares with the threshold value of setting, then goes with the output of comparator the shutoff controlling drive singal.The duration of short circuit that IGBT can bear is very short, is in general only 10 μ s.The existing short-circuit protection circuit of frequency converter drives optocoupler and Hall to detect by integrated intelligent and protects IGBT; but for enterprise; adopt the maintenance cost of these two kinds of components and parts too high, this just needs to provide a short-circuit protection reaction time quick, lower-cost protective circuit.
Utility model content
For overcoming deficiency of the prior art, the short-circuit protection circuit of the frequency changer direct current bus that the utility model provides a kind of and reacts fast, cost is low.
For achieving the above object, the technical solution adopted in the utility model is as follows: a kind of short-circuit protection circuit of frequency changer direct current bus, it is characterized in that: comprise more than one bold and unconstrained Europe resistance R1, resistance R2, R3, R4, R5, R6, more than one current-limiting resistance R7, PNP triode Q1, PNP triode Q2, NPN triode Q3, voltage stabilizing didoe ZD1, ZD2, photoelectrical coupler PC1, electric capacity C1, C2, C3; Described photoelectrical coupler PC1 comprises light-emitting diode D1 and phototriode Q4;
Described frequency converter rectification circuit anode P series connection milliohm resistance R1 to P2, positive pole P connects the negative electrode of voltage stabilizing didoe ZD1, the anode of polar capacitor C1 and the anode of light-emitting diode, the negative electrode of polar capacitor C1 is connected with the anode of ZD1, the emitter of triode Q1 is connected to P2, the base stage of triode Q1, collector electrode is connected with the base stage of triode Q2, and triode Q1 collector electrode is connected to the anode of voltage stabilizing didoe ZD1 by resistance R6, electric capacity C3 is in parallel with resistance R6, the emitter of triode Q2 is connected to positive pole P by resistance R2, the collector electrode of triode Q2 is by resistance R3 in parallel, R4 and electric capacity C2 is connected to the anode of voltage stabilizing didoe, the base stage of triode Q3 is connected with the collector electrode of triode Q2, the emitter of triode Q3 is connected to the negative electrode of voltage stabilizing didoe ZD2, and the anode of voltage stabilizing didoe ZD2 is connected to the anode of voltage stabilizing didoe ZD1, the collector electrode of triode Q3 is connected to the negative electrode of light-emitting diode D1 by resistance R5, the anode of voltage stabilizing didoe ZD1 is connected to N1 by current-limiting resistance R7, phototriode Q4 grounded emitter, current collection is signal output part very.
Further, described milliohm resistance comprises resistance R11 and R12 in parallel.
Further, described current-limiting resistance comprises resistance R71, R72 and R73 of series connection.
Further, also comprise resistance R8, phototriode Q4 emitter is by resistance R8 ground connection, and collector signal exports to CPU processor.
Further, described electric capacity C1 is 10UF, and puncture voltage is 50V.
Seen from the above description; the short-circuit protection circuit of the frequency changer direct current bus that the utility model provides frequency converter short-circuited outside or DC bus current excessive time; can make a response within the extremely short time; turn off the output of IGBT drive circuit; thus make IGBT avoid burning out because of short circuit, without the need to adopting software detection, reliability is higher; production cost is low, greatly reduces the maintenance cost of enterprise.
Accompanying drawing explanation
Fig. 1 is the working frame schematic diagram of the short-circuit protection circuit of the utility model frequency changer direct current bus.
Fig. 2 is the circuit connection diagram of the short-circuit protection circuit of the utility model frequency changer direct current bus.
Embodiment
Below by way of embodiment, the utility model will be further described.
As depicted in figs. 1 and 2, the short-circuit protection circuit of frequency changer direct current bus comprises resistance R11 and R12 in two 10 bold and unconstrained Europe, resistance R2, R3, R4, R5, R8, current-limiting resistance R71, R72, R73, PNP triode Q1, PNP triode Q2, NPN triode Q3, voltage stabilizing didoe ZD1, ZD2, photoelectrical coupler PC1, electric capacity C1, C2, C3, described photoelectrical coupler PC1 comprises light-emitting diode D1 and phototriode Q4, described frequency converter rectification circuit anode P series connection milliohm resistance R1 to P2, positive pole P connects the negative electrode of voltage stabilizing didoe ZD1, the anode of polar capacitor C1 and the anode of light-emitting diode, the negative electrode of polar capacitor C1 is connected with the anode of ZD1, the emitter of triode Q1 is connected to P2, the base stage of triode Q1, collector electrode is connected with the base stage of triode Q2, and triode Q1 collector electrode is connected to the anode of voltage stabilizing didoe ZD1 by resistance R6, electric capacity C3 is in parallel with resistance R6, the emitter of triode Q2 is connected to positive pole P by resistance R2, the collector electrode of triode Q2 is by resistance R3 in parallel, R4 and electric capacity C2 is connected to the anode of voltage stabilizing didoe, the base stage of triode Q3 is connected with the collector electrode of triode Q2, the emitter of triode Q3 is connected to the negative electrode of voltage stabilizing didoe ZD2, and the anode of voltage stabilizing didoe ZD2 is connected to the anode of voltage stabilizing didoe ZD1, the collector electrode of triode Q3 is connected to the negative electrode of light-emitting diode D1 by resistance R5, the current-limiting resistance R71 of anode by connecting of voltage stabilizing didoe ZD1, R72 and R73 is connected to N1, phototriode Q4 emitter is by resistance R8 ground connection, collector signal exports to CPU processor, electric capacity C1 is 10UF, puncture voltage is 50V.
Connect in bold and unconstrained Europe resistor current sample circuit R11, R12 to P2 at frequency converter rectification circuit anode P, within 2 times of scopes that main circuit current is operated in rated current, due to the effect of voltage stabilizing didoe ZD1, a reference-11V (C point current potential) is provided at electric capacity C1 negative terminal, triode Q1, Q2, Q3 are in cut-off state, and protective circuit is failure to actuate; When frequency converter short-circuited outside or major loop operating current are greater than more than 2.5 times of rated current; between DC bus P, N, voltage sharply declines; the current potential of C point is made sharply to drop to-15V; triode Q1, Q2 are simultaneously open-minded; B current potential rises to high level rapidly; triode Q3 is open-minded; now photoelectrical coupler PC1 opens and sends short circuit alarm signal to CPU processor; CPU sends immediately and turns off PWM pulse-width signal; block pwm signal output thus protect IGBT and be not damaged; this process time is extremely short, has only used three microseconds (3uS).Have short-circuit conditions whenever running into output, this circuit within the fastest time (3uS), can play a protective role, until short-circuit bar removes accurately; Triode Q1 plays the effect that upset resets in circuit, because triode Q1 is open-minded, A point current potential returns to high level, triode Q2 ends immediately, meanwhile the current potential of B point declines rapidly, so triode Q3 ends, and photoelectrical coupler PC1 stops sending short circuit alarm signal, gets back to normal operating state at once.
Above are only some embodiments of the present utility model, but design concept of the present utility model is not limited thereto, all changes utilizing this design the utility model to be carried out to unsubstantiality, all should belong to the behavior of invading the utility model protection range.
Claims (5)
1. the short-circuit protection circuit of a frequency changer direct current bus, it is characterized in that: comprise more than one bold and unconstrained Europe resistance R1, resistance R2, R3, R4, R5, R6, more than one current-limiting resistance R7, PNP triode Q1, PNP triode Q2, NPN triode Q3, voltage stabilizing didoe ZD1, ZD2, photoelectrical coupler PC1, electric capacity C1, C2, C3; Described photoelectrical coupler PC1 comprises light-emitting diode D1 and phototriode Q4;
Described frequency converter rectification circuit anode P series connection milliohm resistance R1 to P2, positive pole P connects the negative electrode of voltage stabilizing didoe ZD1, the anode of polar capacitor C1 and the anode of light-emitting diode, the negative electrode of polar capacitor C1 is connected with the anode of ZD1, the emitter of triode Q1 is connected to P2, the base stage of triode Q1, collector electrode is connected with the base stage of triode Q2, and triode Q1 collector electrode is connected to the anode of voltage stabilizing didoe ZD1 by resistance R6, electric capacity C3 is in parallel with resistance R6, the emitter of triode Q2 is connected to positive pole P by resistance R2, the collector electrode of triode Q2 is by resistance R3 in parallel, R4 and electric capacity C2 is connected to the anode of voltage stabilizing didoe, the base stage of triode Q3 is connected with the collector electrode of triode Q2, the emitter of triode Q3 is connected to the negative electrode of voltage stabilizing didoe ZD2, and the anode of voltage stabilizing didoe ZD2 is connected to the anode of voltage stabilizing didoe ZD1, the collector electrode of triode Q3 is connected to the negative electrode of light-emitting diode D1 by resistance R5, the anode of voltage stabilizing didoe ZD1 is connected to N1 by current-limiting resistance R7, phototriode Q4 grounded emitter, current collection is signal output part very.
2. the short-circuit protection circuit of frequency changer direct current bus according to claim 1, is characterized in that: described milliohm resistance comprises resistance R11 and R12 in parallel.
3. the short-circuit protection circuit of frequency changer direct current bus according to claim 1, is characterized in that: described current-limiting resistance comprises resistance R71, R72 and R73 of series connection.
4. the short-circuit protection circuit of frequency changer direct current bus according to claim 1, is characterized in that: also comprise resistance R8, and phototriode Q4 emitter is by resistance R8 ground connection, and collector signal exports to CPU processor.
5. the short-circuit protection circuit of frequency changer direct current bus according to claim 1, is characterized in that: described electric capacity C1 is 10UF, and puncture voltage is 50V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420518193.5U CN204030548U (en) | 2014-09-11 | 2014-09-11 | A kind of short-circuit protection circuit of frequency changer direct current bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420518193.5U CN204030548U (en) | 2014-09-11 | 2014-09-11 | A kind of short-circuit protection circuit of frequency changer direct current bus |
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| Publication Number | Publication Date |
|---|---|
| CN204030548U true CN204030548U (en) | 2014-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420518193.5U Expired - Fee Related CN204030548U (en) | 2014-09-11 | 2014-09-11 | A kind of short-circuit protection circuit of frequency changer direct current bus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655332A (en) * | 2016-10-27 | 2017-05-10 | 江苏科技大学 | Power supply short-circuit-prevention protection system |
| CN104167710B (en) * | 2014-08-07 | 2017-11-10 | 石狮市酷瑞电气有限责任公司 | A kind of short-circuit protection circuit of frequency changer direct current bus |
-
2014
- 2014-09-11 CN CN201420518193.5U patent/CN204030548U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104167710B (en) * | 2014-08-07 | 2017-11-10 | 石狮市酷瑞电气有限责任公司 | A kind of short-circuit protection circuit of frequency changer direct current bus |
| CN106655332A (en) * | 2016-10-27 | 2017-05-10 | 江苏科技大学 | Power supply short-circuit-prevention protection system |
| CN106655332B (en) * | 2016-10-27 | 2018-12-25 | 江苏科技大学 | A kind of anti-short circuit protection system of power supply |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141217 Termination date: 20170911 |
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| CF01 | Termination of patent right due to non-payment of annual fee |