CN201063533Y - Overcurrent self-locking bridge type driving circuit - Google Patents
Overcurrent self-locking bridge type driving circuit Download PDFInfo
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- CN201063533Y CN201063533Y CNU2007201204302U CN200720120430U CN201063533Y CN 201063533 Y CN201063533 Y CN 201063533Y CN U2007201204302 U CNU2007201204302 U CN U2007201204302U CN 200720120430 U CN200720120430 U CN 200720120430U CN 201063533 Y CN201063533 Y CN 201063533Y
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- limiting resistance
- power switch
- switch pipe
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Abstract
The utility model discloses an overcurrent self-lock bridge driving circuit which comprises a current-limiting resistor R1, a current-limiting resistor R4, a power transistor M1, a power transistor M2, a sampling resistor R8, a discharge triode Q1, an isolating diode D3, a thyristor S1 and an optical coupler P1. When the overcurrent signal is sampled in the utility model, the power transistors are clamped at the cut-off state by conducting the thyristors and triggering the optical coupler to work, thereby avoiding the burn-out of the power transistors due to overcurrent, greatly improving the working performance of the circuit, and also decreasing the maintenance cost of the system.
Description
Technical field
The utility model relates to circuit field, relates in particular to a kind of overcurrent self-locking bridge drive circuit.
Background technology
The bridge drive circuit that existing power switch pipe (metal-oxide-semiconductor) is formed, as shown in Figure 1, when signal source Vg1 comes a pulse signal, by current-limiting resistance R1, R2 driving power switching tube M1 operate as normal, when signal source Vg1 impulse hits, power switch pipe M1 is by resistance R 2, acceleration diode D1 repid discharge; Same when signal source Vg2 comes a pulse signal, by current-limiting resistance R3, R4 driving power switching tube M2 operate as normal, when signal source Vg2 impulse hits, power switch pipe M2 is by resistance R 3, acceleration diode D2 repid discharge.
But the shortcoming of prior art is: when overcurrent appearred in power switch pipe, existing bridge drive circuit did not have corresponding protection circuit; cause power switch pipe to be burnt out easily; circuit can't operate as normal, reduces operating efficiency on the one hand, has also increased the maintenance difficulties of system simultaneously.
The utility model content
The technical problems to be solved in the utility model provides a kind of overcurrent self-locking bridge drive circuit.
For solving the problems of the technologies described above, the purpose of this utility model is achieved through the following technical solutions.
A kind of overcurrent self-locking bridge drive circuit comprises current-limiting resistance R1, R4, power switch pipe M1, M2; The end of current-limiting resistance R1 is connected signal source Vg1 end, the other end is connected electrically in the grid of power switch pipe M1, its source electrode links to each other with the drain electrode of power switch pipe M2, and the end of current-limiting resistance R4 is connected electrically in signal source Vg2 end, and the other end is connected the grid of power switch pipe M2;
Also comprise sampling resistor R8, discharge triode Q1, isolating diode D3, thyristor S1, optocoupler P1; The source electrode of described power switch pipe M2 is by sampling resistor R8 ground connection G2; The collector electrode of described discharge triode Q1 is connected between the grid of current-limiting resistance R1 and power switch pipe M1, and its emitter is connected the anode of described isolating diode D3, the minus earth G1 of isolating diode D3; The minus earth G2 of described thyristor S1, its anode are connected electrically on the grid of power switch pipe M2, and the control utmost point of described thyristor S1 is electrically connected with the source electrode of power switch pipe M2; The anode of described optocoupler P1 transmitting terminal diode is connected electrically in voltage controling end VCC, and negative electrode is connected the anode of thyristor S1, and the collector electrode of described optocoupler P1 receiving terminal is electrically connected with signal source Vg1, and its emitter is connected the base stage of discharge triode Q1.
Wherein, further comprise filter capacitor C1, current-limiting resistance R7; The end of described current-limiting resistance R7 is connected the source electrode of power switch pipe M2, and the other end is connected ground G2 end by filter capacitor C1, and the control utmost point of described thyristor S1 is connected the mid point of filter capacitor C1 and current-limiting resistance R7.
Wherein, further comprise current-limiting resistance R9, the end of described current-limiting resistance R9 is connected the anode of optocoupler P1 transmitting terminal diode, another termination voltage controling end VCC.
Wherein, further comprise current-limiting resistance R6, the end of described current-limiting resistance R6 is connected the base stage of discharge triode Q1, other end ground connection G1.
Wherein, comprise further and quicken diode D1, D2 that the negative electrode of described acceleration diode D1 is connected signal source Vg1 end, its anode is connected on the contact of current-limiting resistance R1 and discharge triode Q1; The cathodic electricity of described acceleration diode D2 is connected signal source Vg2 end, and its anode is connected the mid point of current-limiting resistance R4 and power switch pipe M2.
Wherein, further comprise current-limiting resistance R2, R3, the end of described current-limiting resistance R2 is connected the anode that quickens diode D1, and the other end links to each other with the grid of power switch pipe M1; The end of described current-limiting resistance R3 is connected signal source Vg2, and the other end is connected the negative electrode that quickens diode D2.
Wherein, further comprise isolating diode D4, the anode of described isolating diode D4 is connected the mid point of current-limiting resistance R4 and power switch pipe M2, and its negative electrode links to each other with the anode of thyristor S1
Above technical scheme as can be seen, when sampling over-current signal in the utility model, by the conducting thyristor, the work of triggering optocoupler, power switch pipe is clamped at cut-off state, thereby avoid power switch pipe to be burnt out, improved the service behaviour of circuit greatly, also reduced the maintenance cost of system simultaneously because of electric current is excessive.
Description of drawings
Fig. 1 is existing bridge drive circuit schematic diagram;
Fig. 2 is the utility model overcurrent self-locking bridge drive circuit schematic diagram.
Embodiment
For ease of the utility model is further understood, now reach specific embodiment in conjunction with the accompanying drawings the utility model is described in detail.
See also shown in Figure 2ly, comprise and quicken diode D1, D2, power switch pipe M1, M2, discharge triode Q1, optocoupler P1, isolating diode D3, D4, thyristor S1, sampling resistor R8; After quickening diode D1 and current-limiting resistance R1 being in parallel, its negative electrode is connected signal source Vg1 end, the anode A end is connected the grid of power switch pipe M1 by current-limiting resistance R2, its source electrode links to each other with the drain electrode of power switch pipe M2, after quickening diode D2 and current-limiting resistance R4 being in parallel, its negative electrode is connected signal source Vg2 end by current-limiting resistance R3, and anode B end is connected the grid of power switch pipe M2, and its source electrode is by sampling resistor R8 ground connection; The source electrode of power switch pipe M2 also links to each other the ground end G2 of another termination signal source Vg2 of filter capacitor C1 by resistance R 7 with the end of filter capacitor C1;
Power control terminal VCC is connected the anode of optocoupler receiving terminal diode by resistance R 9, its negative electrode is connected the negative electrode of isolating diode D4, the anode of isolating diode D4 is connected the B end, the anode of thyristor S1 links to each other with the negative electrode of isolating diode D4, its negative electrode meets the ground end G2 of signal source Vg2, the control utmost point of thyristor S1 is connected the mid point of resistance R 7 and filter capacitor C1, the collector electrode of optocoupler transmitting terminal is connected signal source Vg1 end by current-limiting resistance R6, the emitter of optocoupler transmitting terminal is connected the base stage of discharge triode Q1, the collector electrode of discharge triode Q1 links to each other with the anode A end that quickens diode D1, emitter is connected the anode of isolating diode D3, the minus earth of isolating diode D3, current-limiting resistance R6 one end is connected the base stage of discharge triode Q1, other end ground connection.
Operation principle of the present utility model:
In the utility model when sampling resistor R8 has sampled over-current signal, thyristor S1 conducting, the B point current potential of power switch pipe M2 is clamped at low level, power switch pipe M2 ends, and the A point current potential of same power switch pipe M1 is clamped at low level by optocoupler P1, and power switch pipe M1 ends, when obstacle is eliminated, after manually restarting control power supply VCC, thyristor S1 ends, and power switch pipe M1, M2 are in operate as normal again.
More than a kind of overcurrent self-locking bridge drive circuit provided by the utility model is described in detail, used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (7)
1. an overcurrent self-locking bridge drive circuit comprises current-limiting resistance R1, R4, power switch pipe M1, M2; The end of current-limiting resistance R1 is connected signal source Vg1 end, the other end is connected electrically in the grid of power switch pipe M1, its source electrode links to each other with the drain electrode of power switch pipe M2, and the end of current-limiting resistance R4 is connected electrically in signal source Vg2 end, and the other end is connected the grid of power switch pipe M2;
It is characterized in that: also comprise sampling resistor R8, discharge triode Q1, isolating diode D3, thyristor S1, optocoupler P1; The source electrode of described power switch pipe M2 is by sampling resistor R8 ground connection G2; The collector electrode of described discharge triode Q1 is connected between the grid of current-limiting resistance R1 and power switch pipe M1, and its emitter is connected the anode of described isolating diode D3, the minus earth G1 of isolating diode D3; The minus earth G2 of described thyristor S1, its anode are connected electrically on the grid of power switch pipe M2, and the control utmost point of described thyristor S1 is electrically connected with the source electrode of power switch pipe M2; The anode of described optocoupler P1 transmitting terminal diode is connected electrically in voltage controling end VCC, and negative electrode is connected the anode of thyristor S1, and the collector electrode of described optocoupler P1 receiving terminal is electrically connected with signal source Vg1, and its emitter is connected the base stage of discharge triode Q1.
2. according to the described overcurrent self-locking of claim 1 bridge drive circuit, it is characterized in that: further comprise filter capacitor C1, current-limiting resistance R7; The end of described current-limiting resistance R7 is connected the source electrode of power switch pipe M2, and the other end is connected ground G2 end by filter capacitor C1, and the control utmost point of described thyristor S1 is connected the mid point of filter capacitor C1 and current-limiting resistance R7.
3. according to the described overcurrent self-locking of claim 2 bridge drive circuit, it is characterized in that: further comprise current-limiting resistance R9, the end of described current-limiting resistance R9 is connected the anode of optocoupler P1 transmitting terminal diode, another termination voltage controling end VCC.
4. according to the described overcurrent self-locking of claim 3 bridge drive circuit, it is characterized in that: further comprise current-limiting resistance R6, the end of described current-limiting resistance R6 is connected the base stage of discharge triode Q1, other end ground connection G1.
5. according to each described overcurrent self-locking bridge drive circuit of claim 1 to 4, it is characterized in that: further comprise and quicken diode D1, D2, the negative electrode of described acceleration diode D1 is connected signal source Vg1 end, and its anode is connected on the contact of current-limiting resistance R1 and discharge triode Q1; The cathodic electricity of described acceleration diode D2 is connected signal source Vg2 end, and its anode is connected the mid point of current-limiting resistance R4 and power switch pipe M2.
6. according to the described overcurrent self-locking of claim 5 bridge drive circuit, it is characterized in that: further comprise current-limiting resistance R2, R3, the end of described current-limiting resistance R2 is connected the anode that quickens diode D1, and the other end links to each other with the grid of power switch pipe M1; The end of described current-limiting resistance R3 is connected signal source Vg2, and the other end is connected the negative electrode that quickens diode D2.
7. according to the described overcurrent self-locking of claim 5 bridge drive circuit, it is characterized in that: further comprise isolating diode D4, the anode of described isolating diode D4 is connected the mid point of current-limiting resistance R4 and power switch pipe M2, and its negative electrode links to each other with the anode of thyristor S1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201204302U CN201063533Y (en) | 2007-05-30 | 2007-05-30 | Overcurrent self-locking bridge type driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201204302U CN201063533Y (en) | 2007-05-30 | 2007-05-30 | Overcurrent self-locking bridge type driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201063533Y true CN201063533Y (en) | 2008-05-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201204302U Expired - Lifetime CN201063533Y (en) | 2007-05-30 | 2007-05-30 | Overcurrent self-locking bridge type driving circuit |
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| CN (1) | CN201063533Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694541A (en) * | 2011-03-24 | 2012-09-26 | 海洋王照明科技股份有限公司 | Self-locking loop circuit |
| CN104682350A (en) * | 2013-11-29 | 2015-06-03 | 深圳市海洋王照明工程有限公司 | Bridge type switching power supply with over current protecting function and lamp |
| CN106487262A (en) * | 2015-08-18 | 2017-03-08 | 长春艾克思科技有限责任公司 | The special voltage stabilizing regulated power supply of 20KV high precision measurement |
| CN107508255A (en) * | 2017-08-31 | 2017-12-22 | 深圳市亚特尔科技有限公司 | A kind of power signal source Drive Protecting Circuit |
| CN109921779A (en) * | 2019-02-28 | 2019-06-21 | 电子科技大学 | A kind of straight-through protection circuit of half-bridge circuit |
-
2007
- 2007-05-30 CN CNU2007201204302U patent/CN201063533Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694541A (en) * | 2011-03-24 | 2012-09-26 | 海洋王照明科技股份有限公司 | Self-locking loop circuit |
| CN104682350A (en) * | 2013-11-29 | 2015-06-03 | 深圳市海洋王照明工程有限公司 | Bridge type switching power supply with over current protecting function and lamp |
| CN106487262A (en) * | 2015-08-18 | 2017-03-08 | 长春艾克思科技有限责任公司 | The special voltage stabilizing regulated power supply of 20KV high precision measurement |
| CN107508255A (en) * | 2017-08-31 | 2017-12-22 | 深圳市亚特尔科技有限公司 | A kind of power signal source Drive Protecting Circuit |
| CN107508255B (en) * | 2017-08-31 | 2019-05-07 | 深圳市亚特尔科技有限公司 | A kind of power signal source Drive Protecting Circuit |
| CN109921779A (en) * | 2019-02-28 | 2019-06-21 | 电子科技大学 | A kind of straight-through protection circuit of half-bridge circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN MEGMEET ELECTRICAL CO., LTD. Free format text: FORMER NAME: SHENZHEN MEGMEET ELECTRICAL TECHNOLOGY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 1804, room 6006, Huafeng building, No. 518034 Shennan Road, Guangdong, Shenzhen Patentee after: Shenzhen Megmeet Electrical Co., Ltd. Address before: 1804, room 6006, Huafeng building, No. 518034 Shennan Road, Guangdong, Shenzhen Patentee before: Shenzhen Megmeet Electrical Technology Co., Ltd. |
|
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 518057, Shenzhen science and technology zone, Guangdong, Nanshan District Province, 13 North Road, Thunis Road, 5, A;B;C501-C503;D;E Patentee after: Shenzhen Megmeet Electrical Co., Ltd. Address before: 1804, room 6006, Huafeng building, No. 518034 Shennan Road, Guangdong, Shenzhen Patentee before: Shenzhen Megmeet Electrical Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080521 |