CN201868843U - External overvoltage protector - Google Patents
External overvoltage protector Download PDFInfo
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- CN201868843U CN201868843U CN2010206274873U CN201020627487U CN201868843U CN 201868843 U CN201868843 U CN 201868843U CN 2010206274873 U CN2010206274873 U CN 2010206274873U CN 201020627487 U CN201020627487 U CN 201020627487U CN 201868843 U CN201868843 U CN 201868843U
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Abstract
The utility model discloses an external overvoltage protector comprising two operational amplifiers, one switch promoting tube, two triodes and two relays. In the external overvoltage protector, partial pressure of a resistor is utilized to take samples from a power supply, the characteristic of an open loop of the operational amplifiers is utilized to compare sampling voltage with preset voltage reference, the two triodes are promoted to work under saturated switching-on and switching-off states, the two relays are controlled to be sucked and interlocked, a comparator can act as long as the output voltage of regulated power supply of a positive power supply or a negative power supply exceeds threshold voltage, the two relays are driven to be sucked and interlocked, and the two groups of power supplies are switched off, so that isolation of load and the power supplies is realized. The external overpressure protector is different from a common current-limiting protector, can completely cut off a power supply supplying power after the input voltage exceeds the rated value, is quick and reliable in action, is easy in circuits, is simple in substitution of components, and is applicable to assemble efficient protecting circuits under the common conditions.
Description
Technical field
The utility model belongs to the power protection field, relates to a kind of supply power voltage and surpasses the protector that can protect payload security in the later certain limit of load voltage value, is specifically related to a kind of external overpressure protector.
Background technology
In the modern power technology, no matter be linear power supply or Switching Power Supply, its inside has all been designed at power supply self with at the protective circuit of load, is used to protect the Electrical Safety of power supply and load.Protective circuit in the Switching Power Supply adopts dedicated control circuit or pulse-width modulator (PWM), and this protective circuit automatically shuts down switching tube when detecting the rising of power output end voltage, and power output end voltage is fallen after rise, and the protection load is not damaged.But this protective circuit is arranged at Switching Power Supply inside, and the components and parts replacement is inconvenient, and needs to use special integrated circuit, and the control circuit complexity can't under household condition be assembled protector efficiently.
Summary of the invention
In order to overcome above-mentioned problems of the prior art, the purpose of this utility model provides a kind of external overpressure protector, breaks away from Switching Power Supply and independently places, and components and parts replace and make things convenient for, and need not special integrated circuit, circuit is simple.
For achieving the above object, the technical scheme that the utility model adopted is:
A kind of external overpressure protector, comprise the first operational amplifier U1 and the second operational amplifier U2, be in series with first capacitor C 1 between the pin 3 of the first operational amplifier U1 and the pin 11, be in series with the 5th resistance R 5 between the pin 7 of the first operational amplifier U1 and the pin 12, one end of the output of the first operational amplifier U1 and the 6th resistance R 6 joins, the base stage of another termination first triode Q1 of the 6th resistance R 6; The inverting input of the first operational amplifier U1 connects an end of second resistance R 2 and the negative pole of the first voltage stabilizing didoe ZD1 respectively, and the normal phase input end of the first operational amplifier U1 links to each other with an end of the 3rd resistance R 3 and an end of the 4th resistance R 4 respectively;
The collector electrode of the first triode Q1 joins with an end of the first relay line bag 2, anodal and second relay K 2 of the first diode D1 respectively, and the emitter of the first triode Q1 links to each other with the 9th pin that switch promotes pipe 1 with second relay K 2 respectively;
Be in series with second capacitor C 2 between the pin 3 of the second operational amplifier U2 and the pin 11, be in series with the 11 resistance R 11 between the pin 7 of the second operational amplifier U2 and the pin 12, the output of the second operational amplifier U2 is connected with an end of the 12 resistance R 12, the base stage of another termination second triode Q2 of the 12 resistance R 12; The inverting input of the second operational amplifier U2 is connected with an end of the 8th resistance R 8 and the negative pole of the second voltage stabilizing didoe ZD2 respectively, and the normal phase input end of the second operational amplifier U2 is connected with an end of the 9th resistance R 9 and an end of the tenth resistance R 10 respectively;
The collector electrode of the second triode Q2 joins with the positive pole of the second diode D2, an end and first relay K 1 of the second relay line bag 3 respectively, and the emitter of the second triode Q2 connects the 11 pin of first relay K 1 and switch promotion pipe 1 respectively;
First relay K 1 also is connected with the other end of the first relay line bag 2, the negative pole of the first diode D1, the pin 9 of the first operational amplifier U1, the pin 9 of the second operational amplifier U2, the other end of the 3rd resistance R 3, the other end of second resistance R 2 and the negative pole of the 3rd diode D3 respectively; First relay K 1 also connects the 31 pin, the 29 pin, the 27 pin, the 25 pin and the 20 tripod that switch promotes pipe 1; First relay K 1 meets output voltage V z;
The positive pole of the 3rd diode D3, switch promote to manage 1 the tenth tripod, the 15 pin that switch promotes pipe 1, the 17 pin that switch promotes pipe 1, the 19 pin of switch promotion pipe 1 and the 21 pin that switch promotes pipe 1 and meet positive supply Vcc respectively;
Second relay K 2 links to each other with the pin 6 of the second operational amplifier U2, the pin 6 of the first operational amplifier U1, the other end of the tenth resistance R 10, the negative pole of the second voltage stabilizing didoe ZD2, the 12 pin of switch promotion pipe 1 and the positive pole of the 4th diode D4, and the negative pole of the 4th diode D4 connects the 14 pin, the 16 pin, the tenth octal, the 20 pin and the 22 pin of negative supply VEE and switch promotion pipe 1 respectively; Second relay K 2 also is connected with octal with the 4th pin of switch promotion pipe 1, and the tripod that switch promotes pipe 1 links to each other with an end of the 7th resistance R 7;
1 the 7th pin is managed in the 6th pin that the crus secunda of the other end of the other end of the other end of the second relay line bag 3, the negative pole of the second diode D2, the 9th resistance R 9, the other end of the 8th resistance R 8, the 7th resistance R 7, switch promotion pipe 1, switch promote pipe 1, switch promotion, the tenth pin and the switch that switch promotes pipe 1 promotes to manage 1 the 40 pin difference ground connection;
The 24 pin, the 26 pin, the 20 octal, the 30 pin, the 32 pin and second relay K 2 that switch promotes pipe 1 meet output voltage V z.
The utility model external overpressure protector need not special integrated circuit, and circuit is simple, and the components and parts replacement is convenient, is suitable for assembling under common condition protective circuit efficiently.
Description of drawings
Fig. 1 is the structural representation of the utility model protector.
Among the figure, 1. switch promotes pipe, the 2. first relay line bag, the 3. second relay line bag.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
As shown in Figure 1, the structure of the utility model protector, comprise the first operational amplifier U1 and the second operational amplifier U2, be in series with first capacitor C 1 between the pin 3 of the first operational amplifier U1 and the pin 11 of the first operational amplifier U1, be in series with the 5th resistance R 5 between the pin 7 of the first operational amplifier U1 and the pin 12 of the first operational amplifier U1, one end of the output 8 of the first operational amplifier U1 and the 6th resistance R 6 joins, the base stage of another termination first triode Q1 of the 6th resistance R 6; The inverting input 4 of the first operational amplifier U1 is connected with an end of second resistance R 2 and the negative pole of the first voltage stabilizing didoe ZD1 respectively, and the normal phase input end 5 of the first operational amplifier U1 is connected with an end of the 3rd resistance R 3 and an end of the 4th resistance R 4 respectively.
The collector electrode of the first triode Q1 joins with an end of the first relay line bag 2, anodal and second relay K 2 of the first diode D1 respectively, and the emitter of the first triode Q1 links to each other with the 9th pin that switch promotes pipe 1 with second relay K 2 respectively.
Be in series with second capacitor C 2 between the pin 3 of the second operational amplifier U2 and the second operational amplifier U2 pin 11, be in series with the 11 resistance R 11 between the pin 7 of the second operational amplifier U2 and the second operational amplifier U2 pin 12, the output 8 of the second operational amplifier U2 is connected with an end of the 12 resistance R 12, the base stage of another termination second triode Q2 of the 12 resistance R 12; The inverting input 4 of the second operational amplifier U2 is connected with an end of the 8th resistance R 8 and the negative pole of the second voltage stabilizing didoe ZD2 respectively, and the normal phase input end 5 of the second operational amplifier U2 is connected with an end of the 9th resistance R 9 and an end of the tenth resistance R 10 respectively.
The collector electrode of the second triode Q2 joins with the positive pole of the second diode D2, an end and first relay K 1 of the second relay line bag 3 respectively, and the emitter of the second triode Q2 connects the 11 pin of first relay K 1 and switch promotion pipe 1 respectively.
First relay K 1 also is connected with the other end of the first relay line bag 2, the negative pole of the first diode D1, the pin 9 of the first operational amplifier U1, the pin 9 of the second operational amplifier U2, the other end of the 3rd resistance R 3, the other end of second resistance R 2 and the negative pole of the 3rd diode D3 respectively; First relay K 1 also connects the 31 pin, the 29 pin, the 27 pin, the 25 pin and the 20 tripod that switch promotes pipe 1; First relay K 1 meets output voltage V z.
The positive pole of three diode D3, switch promote to manage 1 the tenth tripod, the 15 pin that switch promotes pipe 1, the 17 pin that switch promotes pipe 1, the 19 pin of switch promotion pipe 1 and the 21 pin that switch promotes pipe 1 and meet positive supply Vcc respectively.
Second relay K 2 links to each other with the pin 6 of the second operational amplifier U2, the pin 6 of the first operational amplifier U1, the other end of the tenth resistance R 10, the negative pole of the second voltage stabilizing didoe ZD2, the 12 pin of switch promotion pipe 1 and the positive pole of the 4th diode D4, and the negative pole of the 4th diode D4 connects the 14 pin, the 16 pin, the tenth octal, the 20 pin and the 22 pin of negative supply VEE and switch promotion pipe 1 respectively; Second relay K 2 also is connected with octal with the 4th pin of switch promotion pipe 1.The tripod that switch promotes pipe 1 links to each other with an end of the 7th resistance R 7.
1 the 7th pin is managed in the 6th pin that the crus secunda of the other end of the other end of the other end of the second relay line bag 3, the negative pole of the second diode D2, the 9th resistance R 9, the other end of the 8th resistance R 8, the 7th resistance R 7, switch promotion pipe 1, switch promote pipe 1, switch promotion, the tenth pin and the switch that switch promotes pipe 1 promotes to manage 1 the 40 pin difference ground connection.
The 24 pin, the 26 pin, the 20 octal, the 30 pin, the 32 pin and second relay K 2 that switch promotes pipe 1 meet output voltage V z.
Power NPN type silicone epitaxial planar transistor in the high speed of switch promotion pipe 1 employing 40 line sockets is convenient to use easy to maintenance.
The first diode D1 and the second diode D2 are fly-wheel diode, adopt 1N4001 type diode or fast recovery type diode.
First relay K 1 and second relay K 2 adopt direct current 24V or the above dpdt relay of direct current 24V.When expanding, the need power adopts line bag voltage and the bigger relay of contact current.The normally closed point of first group of contact of first relay K 1 connects the output positive supply, connects light-emitting diode and the electronic buzzer as warning usefulness normal battle; The normally closed point of second group of contact is unsettled point, and normal the battle is used for mutual guarantor's interlocking of first relay, is connected in parallel between the transistorized CE of negative supply protector.The normally closed point of first group of contact of second relay K 2 meets negative supply output VZ; the normal battle is used for reporting to the police; the normally closed point of second group of contact is unsettled point, and the normally closed point of second group of contact is connected between the collector electrode of switching transistor of positive supply protector and the emitter and realizes interlocking.Adopt two relays as cutting the control assembly in relay source in this protector, be passable fully as contactless control element in fact and lean on more, but need the driving of thyristor change slightly, prevent that false triggering controls but also will add with thyristor.
First capacitor C 1 and second capacitor C 2 adopt 30P pottery weakening electric capacity; To guarantee that circuit moves reliably.
The resistance of the 5th resistance R 5 and the 11 resistance R 11 is 120K Ω, for operational amplifier provides bias current.
The resistance of the 6th resistance R 6 and the 12 resistance R 12 is 1 K Ω, is current-limiting resistance, for triode provides bias current.
The collector electrode of the collector electrode of the first triode Q1 and the second triode Q2 seals in the relay line bag of a corresponding rated voltage respectively, relay line bag two ends fly-wheel diode in parallel, reverse voltage exerts an influence to switching transistor and damages triode when avoiding triode to end.
The 3rd diode D3 and the 4th diode D4 adopt 1N540 * G series rectifier diode, prevent that voltage from sending inverse time to damage protective circuit.Can or insert the rectifying tube of electric current greatly with its omission in the middle of reality is used, to further expand power, being both should bigger relay and the promotion triode of corresponding use.
For adapting to the needs that voltage changes in the larger context; the first operational amplifier U1 and the second operational amplifier U2 adopt the supply voltage can be at the XFC87 high-pressure type operational amplifier of variation in the ± 45V scope; also can adopt switching rate operational amplifier faster;, this protector more promptly cuts off the electricity supply the protection payload security so that reacting when overvoltage.
This protector is connect power supply output and load respectively; regulating power supply makes supply voltage reach instructions for use; turn on the power switch again; powering load, under normal circumstances energized just directly can powering load, when supply voltage superpressure occurs because of certain reason; when if voltage surpasses 2--～3V; sound and light alarm appears in this protector, cuts off the electricity supply the safety of protection load simultaneously.This protector utilizes electric resistance partial pressure to take a sample from power supply; and utilize the open loop characteristic of operational amplifier that this dividing potential drop and a predefined voltage reference are compared; as second resistance R 2, the 3rd resistance R 3, the 5th resistance R 9 and the 6th resistance R 10 among Fig. 1, the threshold voltage that sampling voltage that their dividing potential drops produce and voltage stabilizing didoe produce compares.Different protectors for different protected magnitudes of voltage can adopt different threshold voltages; also can adopt identical threshold voltage; when adopting identical threshold voltage; make the output of comparator produce identical comparative level by the resistance that changes divider resistance; thereby promote two triodes and be operated in saturation conduction and cut-off state, and then control two relay adhesive interlockings.As long as in positive supply and the negative supply, there is stabilized voltage power supply output voltage on one side to surpass threshold voltage and just can makes the comparator action, drive two relay adhesive interlockings, two groups of power supplys are all cut off, with load and isolated from power.
Also resistance sampling partly can be changed into adjustablely in the practical application, or be changed the reference part circuit into variable TL431 reference circuit, mix again to measure and make this protector become adjustable supply voltage overpressure protector with the display part.
The utility model protector is different with general current-limiting type protector, after the input voltage overrate, can cut off power supply fully.And it is reliable to be swift in motion, and can reach Millisecond, and circuit is simple, and the components and parts replacement is convenient, is suitable for assembling under common condition protective circuit efficiently.
Claims (10)
1. external overpressure protector, it is characterized in that, it comprises first operational amplifier (U1) and second operational amplifier (U2), be in series with first electric capacity (C1) between the pin 3 of first operational amplifier (U1) and the pin 11, be in series with the 5th resistance (R5) between the pin 7 of first operational amplifier (U1) and the pin 12, one end of the output of first operational amplifier (U1) and the 6th resistance (R6) joins, the base stage of another termination first triode (Q1) of the 6th resistance (R6); The inverting input of first operational amplifier (U1) connects an end of second resistance (R2) and the negative pole of first voltage stabilizing didoe (ZD1) respectively, and the normal phase input end of first operational amplifier (U1) links to each other with an end of the 3rd resistance (R3) and an end of the 4th resistance (R4) respectively;
The collector electrode of first triode (Q1) joins with an end of the first relay line bag (2), the positive pole and second relay (K2) of first diode (D1) respectively, and the emitter of first triode (Q1) links to each other with the 9th pin that switch promotes pipe (1) with second relay (K2) respectively;
Be in series with second electric capacity (C2) between the pin 3 of second operational amplifier (U2) and the pin 11, be in series with the 11 resistance (R11) between the pin 7 of second operational amplifier (U2) and the pin 12, the output of second operational amplifier (U2) is connected with an end of the 12 resistance (R12), the base stage of another termination second triode (Q2) of the 12 resistance (R12); The inverting input of second operational amplifier (U2) is connected with an end of the 8th resistance (R8) and the negative pole of second voltage stabilizing didoe (ZD2) respectively, and the normal phase input end of second operational amplifier (U2) is connected with an end of the 9th resistance (R9) and an end of the tenth resistance (R10) respectively;
The collector electrode of second triode (Q2) joins with the positive pole of second diode (D2), an end and first relay (K1) of the second relay line bag (3) respectively, and the emitter of second triode (Q2) connects first relay (K1) respectively and switch promotes to manage the 11 pin of (1);
First relay (K1) also is connected with the other end of the first relay line bag (2), the negative pole of first diode (D1), the pin 9 of first operational amplifier (U1), the pin 9 of second operational amplifier (U2), the other end of the 3rd resistance (R3), the other end of second resistance (R2) and the negative pole of the 3rd diode (D3) respectively; First relay (K1) also connects the 31 pin, the 29 pin, the 27 pin, the 25 pin and the 20 tripod that switch promotes pipe (1); First relay (K1) meets output voltage V z;
The positive pole of the 3rd diode (D3), switch promote to manage the tenth tripod of (1), the 15 pin that switch promotes pipe (1), the 17 pin that switch promotes pipe (1), the 19 pin of switch promotion pipe (1) and the 21 pin that switch promotes pipe (1) and meet positive supply Vcc respectively;
Second relay (K2) links to each other with the pin 6 of second operational amplifier (U2), the pin 6 of first operational amplifier (U1), the other end of the tenth resistance (R10), the negative pole of second voltage stabilizing didoe (ZD2), the 12 pin of switch promotion pipe (1) and the positive pole of the 4th diode (D4), and the negative pole of the 4th diode (D4) meets negative supply VEE respectively and switch promotes to manage the 14 pin, the 16 pin, the tenth octal, the 20 pin and the 22 pin of (1); Second relay (K2) also is connected with octal with the 4th pin of switch promotion pipe (1), and the tripod that switch promotes pipe (1) links to each other with an end of the 7th resistance (R7);
The 7th pin, switch that the 6th pin of the crus secunda of the other end of the other end of the other end of the negative pole of the other end of the second relay line bag (3), second diode (D2), the 9th resistance (R9), the 8th resistance (R8), the 7th resistance (R7), switch promotion pipe (1), switch promotion pipe (1), switch promote to manage (1) promote to manage the tenth pin of (1) and the 40 pin difference ground connection that switch promotes pipe (1);
The 24 pin, the 26 pin, the 20 octal, the 30 pin, the 32 pin and second relay (K2) that switch promotes pipe (1) meet output voltage V z.
2. according to the described overpressure protector of claim 1, it is characterized in that described switch promotes pipe (1) and adopts NPN type silicone epitaxial planar transistor.
3. according to the described overpressure protector of claim 2, it is characterized in that described planar transistor is a power transistor in the high speed of 40 line sockets.
4. according to the described overpressure protector of claim 1, it is characterized in that described first diode (D1) adopts 1N4001 type diode or fast recovery type diode.
5. according to the described overpressure protector of claim 1, it is characterized in that described second diode (D2) adopts 1N4001 type diode or fast recovery type diode.
6. according to the described overpressure protector of claim 1, it is characterized in that described first relay (K1) adopts dpdt relay, described second relay (K2) adopts dpdt relay.
7. according to the described overpressure protector of claim 1, it is characterized in that described first operational amplifier (U1) and second operational amplifier (U2) adopt XFC87 high-pressure type operational amplifier.
8. according to the described overpressure protector of claim 1, it is characterized in that described first electric capacity (C1) and second electric capacity (C2) all adopt 30P pottery weakening electric capacity.
9. according to the described overpressure protector of claim 1, it is characterized in that described second electric capacity (C2) adopts 30P pottery weakening electric capacity.
10. according to the described overpressure protector of claim 1, it is characterized in that described the 3rd diode (D3) and the 4th diode (D4) all adopt 1N540 * G series rectifier diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206274873U CN201868843U (en) | 2010-11-26 | 2010-11-26 | External overvoltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206274873U CN201868843U (en) | 2010-11-26 | 2010-11-26 | External overvoltage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201868843U true CN201868843U (en) | 2011-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206274873U Expired - Fee Related CN201868843U (en) | 2010-11-26 | 2010-11-26 | External overvoltage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201868843U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023009A (en) * | 2012-12-28 | 2013-04-03 | 中国电力科学研究院 | Novel turn-adjustable switching device for secondary damping resistor of arc suppression coil |
| CN105337416A (en) * | 2015-11-19 | 2016-02-17 | 南京大全电气研究院有限公司 | Remote control circuit and remote control method of electronic type relay |
-
2010
- 2010-11-26 CN CN2010206274873U patent/CN201868843U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023009A (en) * | 2012-12-28 | 2013-04-03 | 中国电力科学研究院 | Novel turn-adjustable switching device for secondary damping resistor of arc suppression coil |
| CN105337416A (en) * | 2015-11-19 | 2016-02-17 | 南京大全电气研究院有限公司 | Remote control circuit and remote control method of electronic type relay |
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Legal Events
| 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: 20110615 Termination date: 20141126 |
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| EXPY | Termination of patent right or utility model |