CN203312763U - Triple overvoltage protection circuit for intrinsically-safe power supply - Google Patents
Triple overvoltage protection circuit for intrinsically-safe power supply Download PDFInfo
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- CN203312763U CN203312763U CN2013203734826U CN201320373482U CN203312763U CN 203312763 U CN203312763 U CN 203312763U CN 2013203734826 U CN2013203734826 U CN 2013203734826U CN 201320373482 U CN201320373482 U CN 201320373482U CN 203312763 U CN203312763 U CN 203312763U
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Abstract
The utility model relates to a triple overvoltage protection circuit for an intrinsically-safe power supply. The triple overvoltage protection circuit comprises a circuit which is composed of triple switch circuit and a sampling circuit corresponding to the switch circuit. In the sampling circuit, one end of a resistor R1, one end of a resistor R2, one end of a resistor R3, one end of a resistor R4, one end of a resistor R5 and one end of a resistor R6 and the input terminals of the Q1, Q2 and Q3 in the switch circuit are connected to a positive wire of a intrinsically-safe power supply voltage-stabilizing module; and one end of a resistor R10, one end of a resistor R11, one end of a resistor R12, one end of a voltage stabilizing tube D1, one end of a voltage stabilizing tube D2 and one end of a voltage stabilizing tube D3 are connected to a negative wire of the intrinsically-safe power supply voltage-stabilizing module. The advantages of the triple overvoltage protection circuit are as follows: a relatively-simple circuit is adopted so that output voltage and current can be rapidly turned off under the condition that front-end transformer fault happens in the intrinsically-safe power supply, energy released by an overcurrent is limited, and safety protection is achieved; and when the fault is removed, the circuit returns to normal automatically. The intrinsically-safe power supply with triple overvoltage protection is of an Ia level and can be applied to highly-dangerous 0 zone.
Description
Technical field
The utility model relates to a kind of circuit emergency protective device, more specifically to the triple overvoltage crowbars of a kind of intrinsic safety electric source.
Background technology
In the inferior occasion that explosive combustible arranged of coal mine, electric spark, electric arc are the main incendiary sources that causes explosive combustible explosive combustion.Therefore the Explosion-Proof of electric equipment is that people are in the problem of paying close attention to, conscientiously solving always.One class problem is to take the isolating points burning things which may cause a fire disaster to be the flameproof electrical apparatus of explosion-proof means, and another kind of is suppress and weaken the intrinsicallysafe electrical apparatus that the incendiary source energy is explosion-proof means.Therefore the electric spark produced when preventing the intrinsically safe power supply output overvoltage is lighted explosive combustible, must adopt protective circuit to limit the energy that spark discharges, effective protection power source safety.
The utility model content
The purpose of this utility model be for the prior art weak point, provide a kind of simple in structure, be quick on the draw, the triple overvoltage crowbars of intrinsic safety electric source of reliable in action.
The purpose of this utility model is to realize by following measures: the triple overvoltage crowbars of a kind of intrinsic safety electric source, it is characterized in that, and comprise by triple switching circuits, reach the circuit that the sample circuit corresponding with switching circuit forms; Wherein:
The first heavy circuit comprises the switching circuit by switching tube Q1, R7 serial connection, R10, R1 by voltage comparator U1, voltage comparator U1 input V+ connection, the sample circuit that R2, the voltage-stabiliser tube D1 that voltage comparator U1 input V-connects forms, the R7 of switching circuit connects voltage comparator U1 output;
The second heavy circuit comprises the switching circuit by switching tube Q2, R8 serial connection, R3, R11 by voltage comparator U2, voltage comparator U2 input V+ connection, the sample circuit that R4, the voltage-stabiliser tube D2 that voltage comparator U1 input V-connects forms, the R8 of switching circuit connects voltage comparator U1 output;
Triple circuit comprise the switching circuit by switching tube Q3, R9 serial connection, R5, R12 by voltage comparator U3, voltage comparator U3 input V+ connection, the sample circuit that R6, the voltage-stabiliser tube D3 that voltage comparator U3 input V-connects forms, the R3 of switching circuit connects voltage comparator U3 output;
The input of the end of described resistance R 1, R2, R3, R4, R5, R6 and Q1, the Q2 of switching circuit, Q3 is connected on the electrode line of intrinsic safety electric source Voltage stabilizing module, and the termination of resistance R 10, R11, R12 and voltage-stabiliser tube D1, voltage-stabiliser tube D2, voltage-stabiliser tube D3 enters on the negative line of intrinsic safety electric source Voltage stabilizing module.
Compared with prior art; the triple overvoltage crowbars of the intrinsic safety electric source the utility model proposes; have following advantage: this product adopts fairly simple circuit to realize that intrinsic safety electric source is occurring to turn-off fast the output voltage electric current in front end transformer fault situation; limit the energy that overcurrent discharges, realized safeguard protection.After trouble shooting, can automatically reply normal operation.Intrinsic safety electric source with triple overvoltage protections belongs to " Ia " level, can be applicable to dangerous 0th larger district.
The accompanying drawing explanation
Fig. 1 is embodiment circuit theory diagrams that the utility model proposes.
Embodiment
Below in conjunction with accompanying drawing, embodiment is elaborated: shown in Figure 1ly provided embodiment circuit theory diagrams of the present utility model.In figure, the triple overvoltage crowbars of a kind of intrinsic safety electric source, is characterized in that, comprises by triple switching circuits, reaches the circuit that the sample circuit corresponding with switching circuit forms; Wherein:
The first heavy circuit comprises the switching circuit by switching tube Q1, R7 serial connection, R10, R1 by voltage comparator U1, voltage comparator U1 input V+ connection, the sample circuit that R2, the voltage-stabiliser tube D1 that voltage comparator U1 input V-connects forms, the R7 of switching circuit connects voltage comparator U1 output;
The second heavy circuit comprises the switching circuit by switching tube Q2, R8 serial connection, R3, R11 by voltage comparator U2, voltage comparator U2 input V+ connection, the sample circuit that R4, the voltage-stabiliser tube D2 that voltage comparator U1 input V-connects forms, the R8 of switching circuit connects voltage comparator U1 output;
Triple circuit comprise the switching circuit by switching tube Q3, R9 serial connection, R5, R12 by voltage comparator U3, voltage comparator U3 input V+ connection, the sample circuit that R6, the voltage-stabiliser tube D3 that voltage comparator U3 input V-connects forms, the R3 of switching circuit connects voltage comparator U3 output;
The input of the end of described resistance R 1, R2, R3, R4, R5, R6 and Q1, the Q2 of switching circuit, Q3 is connected on the electrode line of intrinsic safety electric source Voltage stabilizing module, and the termination of resistance R 10, R11, R12 and voltage-stabiliser tube D1, voltage-stabiliser tube D2, voltage-stabiliser tube D3 enters on the negative line of intrinsic safety electric source Voltage stabilizing module.
Operation principle of the present utility model: when normal operation, sample circuit collects the voltage of input, by voltage comparator, compare, if the magnitude of voltage that comparator V+ collects is less than the magnitude of voltage of V-end voltage-stabiliser tube, be that V+ is less than V-, the comparator output low level, switching tube conducting, intrinsic safety electric source can normally be exported.If input voltage surpasses the intrinsic safety electric source rated voltage, the magnitude of voltage that comparator V+ collects is higher than the magnitude of voltage of V-end voltage-stabiliser tube, and comparator is exported high level, and switching tube turn-offs rapidly, and the intrinsic safety electric source no-output plays the safeguard protection effect.After Failure elimination, circuit starts automatically, restores electricity.
The utility model has adopted triple overvoltage protections; strengthened the security performance of intrinsic safety electric source; the intrinsic safety electric source of triple overvoltage protections belongs to " Ia " level; also namely when circuit the normal operation, when one or two technical failure is arranged; all can not light the electric equipment of explosive type mixture, therefore sort circuit can be applicable to dangerous 0th larger district.
The above has described execution mode of the present utility model by reference to the accompanying drawings; the structure that embodiment provides does not form restriction of the present utility model, and in this area, those skilled in the art make within the scope of the appended claims various distortion or revise all in protection range.
Claims (1)
1. the triple overvoltage crowbars of intrinsic safety electric source, is characterized in that, comprises by triple switching circuits, reaches the circuit that the sample circuit corresponding with switching circuit forms; Wherein:
The first heavy circuit comprises the switching circuit by switching tube Q1, R7 serial connection, R10, R1 by voltage comparator U1, voltage comparator U1 input V+ connection, the sample circuit that R2, the voltage-stabiliser tube D1 that voltage comparator U1 input V-connects forms, the R7 of switching circuit connects voltage comparator U1 output;
The second heavy circuit comprises the switching circuit by switching tube Q2, R8 serial connection, R3, R11 by voltage comparator U2, voltage comparator U2 input V+ connection, the sample circuit that R4, the voltage-stabiliser tube D2 that voltage comparator U1 input V-connects forms, the R8 of switching circuit connects voltage comparator U1 output;
Triple circuit comprise the switching circuit by switching tube Q3, R9 serial connection, R5, R12 by voltage comparator U3, voltage comparator U3 input V+ connection, the sample circuit that R6, the voltage-stabiliser tube D3 that voltage comparator U3 input V-connects forms, the R3 of switching circuit connects voltage comparator U3 output;
The input of the end of described resistance R 1, R2, R3, R4, R5, R6 and Q1, the Q2 of switching circuit, Q3 is connected on the electrode line of intrinsic safety electric source Voltage stabilizing module, and the termination of resistance R 10, R11, R12 and voltage-stabiliser tube D1, voltage-stabiliser tube D2, voltage-stabiliser tube D3 enters on the negative line of intrinsic safety electric source Voltage stabilizing module.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN2013203734826U CN203312763U (en) | 2013-06-26 | 2013-06-26 | Triple overvoltage protection circuit for intrinsically-safe power supply |
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CN2013203734826U CN203312763U (en) | 2013-06-26 | 2013-06-26 | Triple overvoltage protection circuit for intrinsically-safe power supply |
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CN203312763U true CN203312763U (en) | 2013-11-27 |
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CN2013203734826U Expired - Lifetime CN203312763U (en) | 2013-06-26 | 2013-06-26 | Triple overvoltage protection circuit for intrinsically-safe power supply |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103916012A (en) * | 2014-04-01 | 2014-07-09 | 江苏杰瑞科技集团有限责任公司 | Intrinsic safety power conversion device |
CN104505807A (en) * | 2014-12-10 | 2015-04-08 | 无锡必创传感科技有限公司 | Automobile sensor protection circuit |
-
2013
- 2013-06-26 CN CN2013203734826U patent/CN203312763U/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103916012A (en) * | 2014-04-01 | 2014-07-09 | 江苏杰瑞科技集团有限责任公司 | Intrinsic safety power conversion device |
CN103916012B (en) * | 2014-04-01 | 2016-09-28 | 江苏杰瑞科技集团有限责任公司 | A kind of essential safety source conversion equipment |
CN104505807A (en) * | 2014-12-10 | 2015-04-08 | 无锡必创传感科技有限公司 | Automobile sensor protection circuit |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
TR01 | Transfer of patent right | ||
TR01 | Transfer of patent right |
Effective date of registration: 20180906 Address after: 200434 room 808, Wu Dong Road, Yangpu District, Shanghai, 808 Patentee after: CHINA COAL TECHNOLOGY & ENGINEERING GROUP SHANGHAI Co.,Ltd. Address before: 201401 No. 369, Wu Tang Road, South Bridge Town, Fengxian District, Shanghai Patentee before: SHANGHAI COAL SCIENCE INDUSTRIAL Co.,Ltd. |
|
CX01 | Expiry of patent term | ||
CX01 | Expiry of patent term |
Granted publication date: 20131127 |