CN103607100B - Overvoltage clamp circuit topological system - Google Patents
Overvoltage clamp circuit topological system Download PDFInfo
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- CN103607100B CN103607100B CN201310568884.6A CN201310568884A CN103607100B CN 103607100 B CN103607100 B CN 103607100B CN 201310568884 A CN201310568884 A CN 201310568884A CN 103607100 B CN103607100 B CN 103607100B
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Abstract
The invention provides a kind of overvoltage clamp circuit topological system, including supply voltage, rectification superposition driver element, benchmark and driving signal element, output detections feedback unit, clamp switch；Drive concussion source signal by rectification superposition clamp switch pipe output end voltage, ensure that oscillator signal is not carried out reliably driving clamp switch to turn in the case of many voltage multiplying rectifiers improve driving voltage by clamp switch pipe, output detections compares the accurate clamp output voltage of feedback with benchmark, such circuit design simple circuit structure, improve the precision of output clamp voltage, make the clamp of High voltage output simultaneously and control simpler.
Description
Technical field
The invention belongs to field of electronic devices, be specifically related to a kind of overvoltage clamp circuit topological system.
Background technology
Overvoltage clamp circuit is widely applied to badly power in environment, for the protection to electrical appliance, is that electrical appliance damages from puncturing of overvoltage surge.Existing overvoltage clamp circuit topological structure, drive circuit has two kinds of circuit forms: one is to arrange oscillator Magnetic isolation to drive clamp switch floatingly, and this type of drive, owing to have employed magnetics, makes the volume of product increase, is not easy to miniaturization integrated；Two is to arrange oscillator to use after many voltage-doubling boost, drives clamped switch, and the method is limit for the circuit of High voltage output, the element of circuit is a lot, it is the most complicated that circuit becomes, and the miniaturization not only bad for circuit is integrated, and in circuit, the multicircuit reliability of the increasing of element is also affected simultaneously.Owing to using pre-voltage stabilizing to drive, output clamp voltage accuracy is low.
Summary of the invention
The present invention is directed to problems of the prior art, it is provided that a kind of overvoltage clamp circuit topological system.
The overvoltage clamp circuit topological system of the present invention, inputs including power supply, also includes rectification superposition driver element, benchmark and drives signal element, output detections feedback unit, clamp switch；The outfan of described power supply input connects the input of clamp switch and benchmark respectively and drives the input of signal element, the outfan of clamp switch connects the input of rectification superposition driver element, the outfan of benchmark and driving signal element connects input and the rectification superposition driver element of detection feedback unit respectively, and the outfan of detection feedback unit is connected with rectification superposition driver element.
Described rectification superposition driver element includes the first rectifier tube, stabilivolt, and the input of stabilivolt is connected with the outfan of clamp switch, and the input of the first rectifier tube is connected with the outfan of clamp switch by resistance；
Described benchmark and driving signal element include supply voltage and connected first circuit and the first audion, the outfan of the first circuit is connected by the base stage of resistance and the first audion, and the outfan of the first circuit is connected by the negative pole of electric capacity and the first rectifier tube；
Described output detections feedback unit includes the second audion, the base stage of the second audion is connected by the outfan of resistance and the first rectifier tube, the emitter stage of the emitter stage of the second audion and the first audion connects, the second audion colelctor electrode be connected with the input of stabilivolt by resistance；
Described clamp switch is field effect transistor.
The negative pole of described first rectifier tube connects the positive pole of the second rectifier tube, the negative pole output of the second rectifier tube.
The emitter stage of described second audion is connected by the negative pole of resistance and the second rectifier tube.
Described rectification superposition driver element passes through the second capacity earth.
Described first circuit ground.
First circuit produces square wave voltage signal and drives field effect transistor to open by Capacitor apart, the first rectifier tube rectification and resistance, capacitor filtering after powering up, after field effect transistor is opened, obtain output voltage, output voltage deducts the voltage drop of field effect transistor equal to input voltage, while setting up output voltage, output voltage passes through the second rectifier tube；First rectifier tube and the first circuit produce square wave voltage signal by Capacitor apart the first rectifier tube rectification and the voltage superimposed guarantee field effect transistor saturation conduction of resistance, capacitor filtering；Maintenance output voltage supplies, and field effect transistor gate source voltage is clamped by stabilivolt, it is ensured that within it is operated in safe voltage range；The regulation of output clamp voltage is configured by sample resistance, and its principle is by the grid of resistance feedback to field effect transistor, the voltage signal detected ensures that output voltage is clamped to a setting voltage value with being compared by the first circuit reference voltage signal of the first audion isolation by the second audion isolation.This systematic difference can ensure that clamp field effect transistor saturation conduction in normal voltage range, the pressure drop of field effect transistor is little, the efficiency of circuit is the highest, only when input seals in high voltage surge voltage, output voltage will be clamped a magnitude of voltage that can set, thus can ensure to receive the safety of electrical appliance below.
Hinge structure of the present invention has the advantage that
1, the drives concussion source signal of the present invention improves voltage without voltage multiplying rectifier or drives clamp switch pipe by isolating transformer suspension, but by rectification superposition clamp switch pipe output end voltage, ensure reliable driving clamp switch conducting, output detections compares the accurate clamp output voltage of feedback with benchmark, such circuit design simple circuit structure, improve the precision of output clamp voltage, make the clamp of High voltage output simultaneously and control simpler.
2, the circuit of the present invention can be widely applied to badly power in environment, for the protection to electrical appliance, is that electrical appliance damages from puncturing of overvoltage surge.
3, circuit structure of the present invention is simple, has the highest job stability and reliability.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the overvoltage clamp circuit topological system of the present invention is described in further detail.
Overvoltage clamp circuit topological system as shown in Figure 1, inputs Vin including power supply, also includes rectification superposition driver element 1, benchmark and drives signal element 2, output detections feedback unit 3, clamp switch 4, and clamp switch 4 is field effect transistor T1；The outfan of power supply input Vin connects the input of clamp switch 4 and benchmark respectively and drives the input of signal element 2, the outfan of clamp switch 4 connects the input of rectification superposition driver element 1, the outfan of benchmark and driving signal element 2 connects input and the rectification superposition driver element 1 of detection feedback unit 3 respectively, and the outfan of detection feedback unit 3 is connected with rectification superposition driver element 1.
Rectification superposition driver element 1 includes the second rectifier tube D2 that the first rectifier tube D1, stabilivolt DZ1 connect with the electric capacity C1 and the first rectifier tube D1 of stabilivolt DZ1 parallel connection；The input of stabilivolt DZ1 is connected with the outfan of clamp switch 4, and the input of the first rectifier tube D1 is connected with the outfan of clamp switch 4 by resistance R1, and rectification superposition driver element 1 is by the second electric capacity C2 ground connection；First rectifier tube D1 is used for rectification square wave, and the second rectifier tube D2 is used for isolating superposition output voltage signal, and stabilivolt DZ1 is used for limiting voltage magnitude.
Benchmark and driving signal element 2 include supply voltage VCC and connected first IC circuit 1 and the first audion T2, the reference output Vref and amplifier out COMP of the first IC circuit 1 and the base stage of the first audion T2 connect, first IC circuit 1 connects also by the base stage of timing capacitor RT/CT, resistance R4 and the first audion T2, resistance R4 connects with electric capacity C5, in parallel with electric capacity C4；The square wave outfan OUT of the first IC circuit 1 is connected by the negative pole of electric capacity C3 and the first rectifier tube D1；Amplifier negative input end is V-, and current detecting end is IE；First IC circuit 1 ground connection；First IC circuit 1 is a pulse width modulator, it is provided that benchmark also produces square-wave signal, and the first audion T2 amplifies and isolation reference signal.
Output detections feedback unit 3 includes the second audion T3, and the base stage of the second audion T3 is connected by the outfan of resistance R3 and the first rectifier tube D1, and the negative pole of the first rectifier tube D1 connects the positive pole of the second rectifier tube D2, the negative pole output of the second rectifier tube D2；The emitter stage of the second audion T3 and the emitter stage of the first audion T2 connect, the emitter stage of the second audion T3 is connected with the outfan of R3 and the second rectifier tube D2 by resistance R5, resistance R6, resistance, and the colelctor electrode of the second audion T3 is connected by the input of resistance R2 and stabilivolt DZ1.Second audion T3 is used for detecting and comparing output voltage.
Wherein, C1, C2, C4, C5 are filter capacitor；C3 is isolation capacitance；R1, R2, R4, R5 are current-limiting resistance；R3, R6 are divider resistance.
Drive concussion source signal by rectification superposition clamp switch pipe output end voltage, ensure that oscillator signal is not carried out reliably driving clamp switch to turn in the case of many voltage multiplying rectifiers improve driving voltage by clamp switch pipe, concussion source signal is by rectification superposition drive circuit, and output detections compares the accurate clamp output voltage of feedback with benchmark.
First IC circuit 1 is common pulse-width modulation circuit, power supply input VinWith the first IC circuit 1 power up after, the first IC circuit 1 produce square wave voltage signal by electric capacity C3 isolate, the first rectifier tube D1 rectification and resistance R1, electric capacity C2 filtering drive field effect transistor T1 open, field effect transistor T1 open after, obtain output voltage+VOUT, output voltage+VOUTEqual to VinDeduct the voltage drop of field effect transistor T1, while setting up output voltage, output voltage+VOUTBy the second rectifier tube D2；First rectifier tube D1 and the first IC circuit 1 produce square wave voltage signal and isolate the first rectifier tube D1 rectification and the voltage superimposed guarantee field effect transistor T1 saturation conduction of resistance R1, electric capacity C2 filtering by electric capacity C3；Maintenance output voltage supplies, and field effect transistor T1 gate source voltage is clamped by stabilivolt DZ1, it is ensured that within it is operated in safe voltage range.
The regulation of output clamp voltage is configured by sample resistance R3 and resistance R6, and its principle is the voltage signal that detects by the second audion T3 isolation and the first IC circuit 1 reference voltage signal isolated by the first audion T2 to be compared and feed back to the grid of field effect transistor T1 by resistance R2 and ensure that output voltage is clamped to a setting voltage value.This systematic difference can ensure that clamp field effect transistor T1 saturation conduction in normal voltage range, the pressure drop of field effect transistor T1 is little, the efficiency of circuit is the highest, only when input seals in high voltage surge voltage, output voltage will be clamped a magnitude of voltage that can set, thus can ensure to receive the safety of electrical appliance below.
Claims (2)
1. overvoltage clamp circuit topological system, including power supply input (Vin) and power supply output (Vout), it is characterised in that: also include rectification superposition driver element (1), benchmark and drive signal element (2), output detections feedback unit (3) and clamp switch (4)；Described power supply input (Vin) connects clamp switch (4), power supply output (Vout) connects rectification superposition driver element (1), clamp switch (4) is connected with rectification superposition driver element (1), benchmark and driving signal element (2) and output detections feedback unit (3) respectively, and described rectification superposition driver element (1) includes the first rectifier tube (D1), the second rectifier tube (D2), stabilivolt (DZ1), the first electric capacity (C1), the second electric capacity (C2), the 3rd electric capacity (C3) and the first resistance (R1)；Described benchmark and driving signal element (2) include supply voltage (VCC) and connected first circuit (IC1), the first audion (T2), the 4th electric capacity (C4), the 5th electric capacity (C5) and the 4th resistance (R4)；Described output detections feedback unit (3) includes the second audion (T3), the second resistance (R2), the 3rd resistance (R3), the 5th resistance (R5) and the 6th resistance (R6)；Described clamp switch (4) is field effect transistor (T1)；
Described field effect transistor (T1) drain electrode is connected with power supply input (Vin), source electrode respectively with stabilivolt (DZ1) positive pole, first electric capacity (C1) one end and power supply output (Vout) connect, grid respectively with the second electric capacity (C2) one end, stabilivolt (DZ1) negative pole and the first resistance (R1) one end connect, first resistance (R1) other end respectively with the first electric capacity (C1) other end, first rectifier tube (D1) negative pole connects, first rectifier tube (D1) positive pole is connected with the 3rd electric capacity (C3) one end and the second rectifier tube (D2) negative pole respectively, second rectifier tube (D2) positive pole is held with power supply output (Vout) respectively, 3rd resistance (R3) one end connects；nullSecond resistance (R2) one end respectively with the first resistance (R1) one end、Stabilivolt (DZ1) negative pole and the second electric capacity (C2) one end connect，Second resistance (R2) other end connects the second audion (T3)，3rd electric capacity (C3) other end connects the out end of the first circuit (IC1)，3rd resistance (R3) other end respectively with the B pole of the second audion (T3)、One end of 6th resistance (R6) connects，The E pole of the second audion (T3) respectively with the E pole of the first audion (T2)、One end of 5th resistance (R5) connects，5th resistance (R5) and the other end ground connection of the 6th resistance (R6)，The C pole of the first audion (T2) Vcc end with supply voltage (VCC) and the first circuit (IC1) respectively is connected，The B pole of the first audion (T2) is connected with Vref end and the 4th resistance (R4) one end of the first circuit (IC1) respectively，4th resistance (R4) other end respectively with the 5th electric capacity (C5) one end、The RT/CT end of the first circuit (IC1) connects，The COMP end of the first circuit (IC1) and the 4th electric capacity (C4) one end connect，4th electric capacity (C4) and the other end ground connection of the 5th electric capacity (C5)，The GND end of the first circuit (IC1)、IE end and V_ end ground connection.
2. overvoltage clamp circuit topological system as claimed in claim 1, it is characterised in that: described first rectifier tube (D1) is used for rectification square wave, and the second rectifier tube (D2) is used for isolating superposition output voltage signal, and stabilivolt (DZ1) is used for limiting voltage magnitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310568884.6A CN103607100B (en) | 2013-11-15 | 2013-11-15 | Overvoltage clamp circuit topological system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310568884.6A CN103607100B (en) | 2013-11-15 | 2013-11-15 | Overvoltage clamp circuit topological system |
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| Publication Number | Publication Date |
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| CN103607100A CN103607100A (en) | 2014-02-26 |
| CN103607100B true CN103607100B (en) | 2016-10-05 |
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| CN201310568884.6A Expired - Fee Related CN103607100B (en) | 2013-11-15 | 2013-11-15 | Overvoltage clamp circuit topological system |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3193827B2 (en) * | 1994-04-28 | 2001-07-30 | 三菱電機株式会社 | Semiconductor power module and power converter |
| JP3381491B2 (en) * | 1995-11-30 | 2003-02-24 | 三菱電機株式会社 | Semiconductor element protection circuit |
| US7450354B2 (en) * | 2005-09-08 | 2008-11-11 | Aimtron Technology Corp. | Linear voltage regulator with improved responses to source transients |
| CN101499654B (en) * | 2008-10-23 | 2010-10-06 | 天水华天微电子股份有限公司 | Instant voltage peak and instant voltage surge suppressor |
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