CN202602259U - Overcurrent driving protection device for PWM control circuit - Google Patents
Overcurrent driving protection device for PWM control circuit Download PDFInfo
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- CN202602259U CN202602259U CN 201220204020 CN201220204020U CN202602259U CN 202602259 U CN202602259 U CN 202602259U CN 201220204020 CN201220204020 CN 201220204020 CN 201220204020 U CN201220204020 U CN 201220204020U CN 202602259 U CN202602259 U CN 202602259U
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- control circuit
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Abstract
The utility model relates to a driving protection circuit for a power electronic device, specifically relating to an overcurrent driving protection device for a PWM control circuit. The overcurrent driving protection device for a PWM control circuit realizes soft close for overcurrent protection and eliminates the situation that tube-explosion occurs when a device is started after the overcurrent protection. The overcurrent driving protection device for a PWM control circuit is practical, reliable and low in cost, and makes a pulse transformer overcurrent being able to perform soft close.
Description
Technical field
The utility model relates to the Drive Protecting Circuit of power electronic device, and the spy relates to a kind of overcurrent drive protecting device of pwm control circuit.
Background technology
The application of modern power electronic device (P-MOS IGBT) is more and more wider, when overcurrent takes place, will in time protect, be in very short time (10us), power device is closed in locking pulse output rapidly! Otherwise power device will thoroughly burn!
Because shutoff is too fast, has produced new problem! Because the existence of capacitor and inductor is arranged, too fast closing will produce very high peak voltage at the device for power switching two ends in the circuit, and this voltage one surpasses the withstand voltage of device, and this device is also just breakdown!
Traditional technology has been introduced " turn-offing at a slow speed ", both in the duration of short circuit that allows, takes measures, and the control pole tension is descended by 15V more slowly, cuts off at a slow speed when reaching overcurrent.(the 380th page of list of references 1)
Traditional various " turn-offing at a slow speed " control circuit is at switch power device end (high-pressure side); For isolating; Be overcurrent protection, the high request that has just adopts " special-purpose driving mould is fast ", and most of circuit adopts simple and practical pulse transformer and optocoupler gate drive circuit.(the 366th page of list of references 1)
Traditional various " turn-offing at a slow speed " control circuits are because by isolation end:
1. will use high tension apparatus, reliability reduces.
2. complicated circuit increases cost.
3. will there be insulating power supply on each road.
4. owing to optocoupler reason frequency is done not high.
Here it is, and most of products the reason that does not adopt!
And simple and practical pulse transformer of tradition and optocoupler gate drive circuit cut off function when not having overcurrent at a slow speed! Even detect overcurrent, and close (the hard shutoff), device for power switching most likely could be breakdown at once!
(application number: CN02239635.7) disclosed is a kind of power inverter overcurrent protector to China's utility model patent " power inverter overcurrent protector "; Comprise current transformer, voltage comparator, monostable trigger, bistable trigger, PWM controller; The overcurrent that the overcurrent protector of this patent can avoid power switch pipe to stand for a long time to continue impacts; Thereby make the power inverter can reliably working, can be protected effectively again.But this patent document does not adopt Drive Protecting Circuit, realizes the soft shutoff of pulse transformer overcurrent.
Summary of the invention
To problem related in the technical background, the utility model is through setting up Drive Protecting Circuit, eliminated overcurrent protection after, start shooting with regard to blasted pipe phenomenon again.
The technical scheme of the utility model is: a kind of overcurrent drive protecting device of pwm control circuit; Comprise that pwm control circuit, over-current detection circuit, driving promote circuit, power device; Over-current detection circuit is used to check the electric current of power device; Drive and promote the drives power device, it is characterized in that: also comprise Drive Protecting Circuit, Drive Protecting Circuit promotes circuit with pwm control circuit, over-current detection circuit, driving and is connected; When over-current detection circuit detects overcurrent, cross output and Drive Protecting Circuit action that current circuit blocks pwm control circuit.Its beneficial effect is: 1. simple and practical, reliable, low-cost; 2. make the pulse transformer overcurrent also can carry out soft shutoff; 3. after having eliminated overcurrent protection, start shooting with regard to blasted pipe phenomenon again!
The overcurrent drive protecting device of aforesaid pwm control circuit, it is characterized in that: Drive Protecting Circuit comprises D1, Q1, Q3, R2, R, 3, the R4 device,
Diode D1 is connected triode Q1 two ends;
The collector electrode of triode Q3 is connected with the base stage of triode Q1, the emitter grounding of Q3;
R3 connects the base stage of Q1, another termination power of R3;
R4 connects the base stage of Q3, and the other end of R4 is taken over the stream signal;
R2 connects the collector electrode of Q1, R2 other end ground connection;
The collector electrode of Q1 meets driving resistor R1, and the emitter-base bandgap grading of Q1 meets PWM;
Diode D1 and transistor Q1 are serially connected with R1 and PWM.
As shown in Figure 2.
The overcurrent drive protecting device of aforesaid pwm control circuit, it is characterized in that: Drive Protecting Circuit comprises D1, Q1, Q3, R2, R, 3, R4, C11;
Diode D1 is connected triode Q1 two ends;
The source class of triode Q1 connects PWM, leaks level and connects R1, R2, and the grid level connects the collector electrode of triode Q3;
Triode Q3 base stage meets R4, emitter grounding; The other end of R4 is taken over signal;
R3 connects the Q3 collector electrode, another termination power of R3;
R2 connects the leakage level of Q1, R2 other end ground connection;
C11 meets Q1 and leaks level R2, C11 other end ground connection.
As shown in Figure 3.
The overcurrent drive protecting device of aforesaid pwm control circuit, it is characterized in that: Drive Protecting Circuit comprises D1A, D1B, Q1A, Q1B, Q3, R2A, R2B, R3, R4, R7, R8;
Diode D1A is connected triode Q1A two ends;
The base stage of Q1A is connected with R7, and the other end of R7 is connected with the collector electrode of Q3;
The emitter-base bandgap grading of Q1A links to each other with PWM (A), and the collector electrode of Q1A links to each other with R2A, R1A, the other end ground connection of R2;
Diode D1B is connected triode Q1B two ends;
The base stage of Q1B is connected with R8, and the other end of R8 is connected with the collector electrode of Q3;
The emitter-base bandgap grading of Q1B links to each other with PWM (B), and the collector electrode of Q1B links to each other with R1B, R2B, the other end ground connection of R2B;
R3 links to each other with the collector electrode of Q3, another termination power;
R4 links to each other with the base stage of Q3, and the other end links to each other with over-current signal.
As shown in Figure 4.
Description of drawings
Fig. 1 is a Drive Protecting Circuit square frame principle sketch map in the convertor circuit.
Fig. 2 is an electromagnetic isolation drive circuit principle schematic.
Fig. 3 is the photoelectric isolating driving circuit principle schematic.
Fig. 4 is an electromagnetic isolation bridge drive circuit principle schematic.
Embodiment
Below in conjunction with accompanying drawing, the utility model is done further explanation:
Structure or function identical among the figure mark with identical numeral.Should be noted that the purpose of accompanying drawing just is convenient to the explanation to the utility model practical implementation, is not a kind of unnecessary narration or to the restriction of the utility model, there is no need in addition to draw in proportion.
The overcurrent Drive Protecting Circuit that the overcurrent drive protecting protective device of described pwm control circuit is set up by pwm control circuit, over-current detection circuit, driving promotion circuit, power device and the utility model is formed (as shown in Figure 1).Wherein power device can be P-MOS or IGBT device.
The utility model embodiment 1:(electromagnetic isolation is driving)
Circuit is as shown in Figure 2, analyzes as follows:
1. operate as normal: (not having over-current signal)
The pwm pulse rising edge makes the quick conducting of Q2 (N-channel MOS FET) forward through D1 diode, R1, exports through isolating transformer T.
During the pwm pulse trailing edge, owing to do not have over-current signal, the conducting of Q1 positively biased, the Q2 gate voltage drags down through R1 Q1 fast, and Q2 is ended rapidly, exports a complete pulse like this.
2. overcurrent protection:
At first there is the pwm pulse rising edge to make Q2 (N-channel MOS FET) forward conduction, exports through isolating transformer T through D1 diode, R1.
When having detected over-current phenomenon avoidance, over-current signal output high level blocks PWM output, Q3 conducting simultaneously, and Q1 ends.The last grid junction capacitance of Q2 there has not been the repid discharge passage, can only select suitable R 2 values through the R2 discharge, and the output trailing edge is progressively lowered in less than 10uS, has realized soft shutoff, has reached the protection purpose.
The utility model embodiment 2:(photoelectricity isolation drive type)
Circuit is as shown in Figure 3, analyzes as follows:
1. operate as normal: (not having over-current signal)
The pwm pulse rising edge makes the quick conducting of Q2 (N-channel MOS FET) forward through D1 diode, R1, exports through optocoupler U.
During the pwm pulse trailing edge, owing to do not have over-current signal, the conducting of Q1 positively biased, Q2 control pole tension drags down through R1 Q1 fast, and Q2 is ended rapidly, exports a complete pulse like this.
2. overcurrent protection:
At first have the pwm pulse rising edge to make Q2 (N-channel MOS FET) forward conduction through D1 diode, R1, through isolating transformer T output, C11 is full of simultaneously.
When having detected over-current phenomenon avoidance, over-current signal output high level blocks PWM output, Q3 conducting simultaneously, and Q1 ends.The C11 capacitance voltage has not had the repid discharge passage, can only pass through R1, R2 discharge, selects suitable R 1, R2, C11 value, and the output trailing edge is progressively lowered in less than 10uS, has realized soft shutoff, has reached the protection purpose.
The utility model embodiment 3:(the electromagnetic isolation bridge-type is driving)
Can be used for half-bridge full-bridge hard switching circuit, also can be used for soft switch circuit, each overlaps this circuit with one leading arm lagging leg.
Circuit is as shown in Figure 4, analyzes as follows:
1. do not work: (no-output)
PWM (A) is the equal output low level in two ends (B), and Q5 Q7 ends, and no over-current signal Q3 also ends, Q1A, Q1B, Q2A, the equal conducting of Q2B.The pulse transformer two ends all are high potential, and potential difference is zero, so not output.
2. operate as normal: (not having over-current signal)
PWM (A) end rising edge of a pulse oppositely ends Q2A (P channel mosfet) through D1A diode, R1 fast, simultaneously Q5 (N-channel MOS FET) forward conduction.
During PWM (A) end pulse trailing edge, owing to do not have over-current signal, the conducting of Q1A positively biased, the Q2A gate voltage drags down through R1, Q1 fast, makes the rapid conducting of Q2A, exports a complete pulse like this, exports through isolating transformer T.
[0032]So PWM (B) end pulse output services process and PWM (A) end pulsed operation are similar not in narration.
3. overcurrent protection:
At first have PWM (A) or (B) end (only having one tunnel) rising edge of a pulse through D1A or D1B diode, R1A or R1B Q2A or Q2B (P channel mosfet) are oppositely ended fast, simultaneously Q2A or Q2B (N-channel MOS FET) forward conduction.
When having detected over-current phenomenon avoidance, over-current signal output high level blocks PWM output, Q3 conducting simultaneously, and Q1A, Q1B all end.Q2A or Q2B go up grid junction capacitance voltage and have not had the repid discharge passage, can only select suitable R 2A, R2B value through R2A or R2B discharge, and the output trailing edge is progressively lowered in less than 10uS, have realized soft shutoff, have reached the protection purpose.
The inventor successfully is applied to welding power supply to the utility model, and when experiment, traditional electric welding machine (electromagnetic isolation driving) is when serious short circuit overcurrent, though can turn-off (the hard shutoff) by overcurrent, most of switch power devices still are breakdown! And with the electric welding machine of the utility model when the serious short circuit overcurrent, all protection switch power device is effectively carried out " turn-offing at a slow speed ", effect is splendid.
In sum, the utility model overcurrent isolation drive protection is effectively compared in traditional isolation drive protection, has a lot of advantages, a kind of good overcurrent protection new method of can yet be regarded as.
The above; It only is the preferred embodiment of the utility model; Be not that the utility model is done any pro forma restriction, any those skilled in the art is not breaking away under the utility model technical scheme scope situation; Utilize the method content of above-mentioned announcement that the utility model technical scheme is made many possible changes and modification, all belong to the scope of claims protection.
List of references 1: (power electronic device is extremely used) Li Xu preserves Zhao Yongjian to write
ISBN?7-111-05338-9。
Claims (4)
1. the overcurrent drive protecting device of a pwm control circuit; Comprise that pwm control circuit, over-current detection circuit, driving promote circuit, power device; Over-current detection circuit is used to check the electric current of power device; Drive and promote the drives power device, it is characterized in that: also comprise Drive Protecting Circuit, Drive Protecting Circuit promotes circuit with pwm control circuit, over-current detection circuit, driving and is connected; When over-current detection circuit detects overcurrent, cross output and Drive Protecting Circuit action that current circuit blocks pwm control circuit.
2. the overcurrent drive protecting device of pwm control circuit as claimed in claim 1, it is characterized in that: Drive Protecting Circuit comprises D1, Q1, Q3, R2, R, 3, the R4 device,
Diode D1 is connected triode Q1 two ends;
The collector electrode of triode Q3 is connected with the base stage of triode Q1, the emitter grounding of Q3;
R3 connects the base stage of Q1, another termination power of R3;
R4 connects the base stage of Q3, and the other end of R4 is taken over the stream signal;
R2 connects the collector electrode of Q1, R2 other end ground connection;
The collector electrode of Q1 meets driving resistor R1, and the emitter-base bandgap grading of Q1 meets PWM;
Diode D1 and transistor Q1 are serially connected with R1 and PWM.
3. the overcurrent drive protecting device of pwm control circuit as claimed in claim 1, it is characterized in that: Drive Protecting Circuit comprises D1, Q1, Q3, R2, R, 3, R4, C11;
Diode D1 is connected triode Q1 two ends;
The source class of triode Q1 connects PWM, leaks level and connects R1, R2, and the grid level connects the collector electrode of triode Q3;
Triode Q3 base stage meets R4, emitter grounding; The other end of R4 is taken over signal;
R3 connects the Q3 collector electrode, another termination power of R3;
R2 connects the leakage level of Q1, R2 other end ground connection;
C11 meets Q1 and leaks level R2, C11 other end ground connection.
4. the overcurrent drive protecting device of pwm control circuit as claimed in claim 1, it is characterized in that: Drive Protecting Circuit comprises D1A, D1B, Q1A, Q1B, Q3, R2A, R2B, R3, R4, R7, R8; Diode D1A is connected triode Q1A two ends; The base stage of Q1A is connected with R7, and the other end of R7 is connected with the collector electrode of Q3; The emitter-base bandgap grading of Q1A links to each other with PWM (A), and the collector electrode of Q1A links to each other with R2A, R1A, the other end ground connection of R2; Diode D1B is connected triode Q1B two ends; The base stage of Q1B is connected with R8, and the other end of R8 is connected with the collector electrode of Q3; The emitter-base bandgap grading of Q1B links to each other with PWM (B), and the collector electrode of Q1B links to each other with R1B, R2B, the other end ground connection of R2B; R3 links to each other with the collector electrode of Q3, another termination power; R4 links to each other with the base stage of Q3, and the other end links to each other with over-current signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220204020 CN202602259U (en) | 2012-05-09 | 2012-05-09 | Overcurrent driving protection device for PWM control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220204020 CN202602259U (en) | 2012-05-09 | 2012-05-09 | Overcurrent driving protection device for PWM control circuit |
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| Publication Number | Publication Date |
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| CN202602259U true CN202602259U (en) | 2012-12-12 |
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| CN 201220204020 Expired - Lifetime CN202602259U (en) | 2012-05-09 | 2012-05-09 | Overcurrent driving protection device for PWM control circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102761105A (en) * | 2012-05-09 | 2012-10-31 | 刘裕国 | Overcurrent driving protection device and method for PWM control circuit |
| CN103312132A (en) * | 2013-07-02 | 2013-09-18 | 上海沪工焊接集团股份有限公司 | Driving circuit for inverter welding power source |
| CN107070251A (en) * | 2017-03-14 | 2017-08-18 | 珠海万力达电气自动化有限公司 | A kind of railway power line cleaner cooperative control system and method |
| CN107482590A (en) * | 2017-10-12 | 2017-12-15 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of driving of IGBT module and fault secure circuit |
-
2012
- 2012-05-09 CN CN 201220204020 patent/CN202602259U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102761105A (en) * | 2012-05-09 | 2012-10-31 | 刘裕国 | Overcurrent driving protection device and method for PWM control circuit |
| CN102761105B (en) * | 2012-05-09 | 2015-06-24 | 刘裕国 | Overcurrent driving protection device and method for PWM control circuit |
| CN103312132A (en) * | 2013-07-02 | 2013-09-18 | 上海沪工焊接集团股份有限公司 | Driving circuit for inverter welding power source |
| CN103312132B (en) * | 2013-07-02 | 2016-04-27 | 上海沪工焊接集团股份有限公司 | For the drive circuit of inversion welding source |
| CN107070251A (en) * | 2017-03-14 | 2017-08-18 | 珠海万力达电气自动化有限公司 | A kind of railway power line cleaner cooperative control system and method |
| CN107070251B (en) * | 2017-03-14 | 2019-06-14 | 珠海万力达电气自动化有限公司 | A kind of cooperative control system and method for railway power line cleaner |
| CN107482590A (en) * | 2017-10-12 | 2017-12-15 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of driving of IGBT module and fault secure circuit |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121212 |
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| CX01 | Expiry of patent term |