CN104750159B - A kind of overvoltage crowbar - Google Patents
A kind of overvoltage crowbar Download PDFInfo
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- CN104750159B CN104750159B CN201510131478.2A CN201510131478A CN104750159B CN 104750159 B CN104750159 B CN 104750159B CN 201510131478 A CN201510131478 A CN 201510131478A CN 104750159 B CN104750159 B CN 104750159B
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- amplitude limit
- divider resistance
- bipolar transistor
- electric capacity
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Abstract
The invention discloses a kind of overvoltage crowbar, comprise signal input part, signal processing circuit, low pressure amplitude limiter circuit, high pressure amplitude limiter circuit, low pressure amplitude limiter circuit comprises the first amplitude limit control voltage, the first divider resistance, the second divider resistance, the first amplitude limit electric capacity and NPN bipolar transistor; High pressure amplitude limiter circuit comprises the second amplitude limit control voltage, the 3rd divider resistance, the 4th divider resistance, the second amplitude limit electric capacity and PNP bipolar transistor; NPN, PNP bipolar transistor is connected with the input end of signal processing circuit respectively; Second divider resistance and the first amplitude limit Capacitance parallel connection, and be connected with NPN bipolar transistor respectively; 3rd divider resistance is series between the second amplitude limit control voltage and the base stage of PNP bipolar transistor; 4th divider resistance and the second amplitude limit Capacitance parallel connection, and be connected with PNP bipolar transistor respectively; 4th divider resistance and the second amplitude limit electric capacity and PNP bipolar transistor respectively with reference to be connected.The present invention has the advantages such as amplitude limit precision high, convenient change limiting voltage size.
Description
Technical field
The present invention relates to the technical field of overvoltage protection, refer in particular to a kind of overvoltage crowbar.
Background technology
In electronic circuit, often need to take amplitude limit measure to signal voltage, suffer damage or cisco unity malfunction to avoid electron device to bear too high signal voltage.Prior art many employings stabilivolt, diode and schottky diode realize voltage amplitude limit function; but; the leakage current of stabilivolt and schottky diode is large and rise with temperature and increase; because this increasing the burden of signal source or affecting the precision of signal voltage; moreover; the dynamic resistance of stabilivolt, diode and schottky diode is all comparatively large, and time larger by electric current, its positive negative electrode two ends pressure drop is also comparatively large, make their amplitude limit ability and amplitude limit precision all lower.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art and shortcoming, provide a kind of structure simple, leak electricity little and also can be realized the overvoltage crowbar of degree of precision by larger current.
For achieving the above object, technical scheme provided by the present invention is: a kind of overvoltage crowbar, comprises signal input part, signal processing circuit, low pressure amplitude limiter circuit, high pressure amplitude limiter circuit, and wherein, described signal input part is connected to input resistance; Described low pressure amplitude limiter circuit comprises the first amplitude limit control voltage, the first divider resistance, the second divider resistance, the first amplitude limit electric capacity and NPN bipolar transistor; Described high pressure amplitude limiter circuit comprises the second amplitude limit control voltage, the 3rd divider resistance, the 4th divider resistance, the second amplitude limit electric capacity and PNP bipolar transistor; The emitter of described NPN bipolar transistor and the emitter of PNP bipolar transistor are all connected on the input end of signal processing circuit; Described first divider resistance is series between the first amplitude limit control voltage and the base stage of NPN bipolar transistor; Described second divider resistance and the first amplitude limit Capacitance parallel connection, this second divider resistance is all connected with the base stage of NPN bipolar transistor with one end of the first amplitude limit electric capacity; The other end of described second divider resistance and the first amplitude limit electric capacity and the collector of NPN bipolar transistor are all connected to reference on the ground; Described 3rd divider resistance is series between the second amplitude limit control voltage and the base stage of PNP bipolar transistor; Described 4th divider resistance and the second amplitude limit Capacitance parallel connection, the 4th divider resistance is all connected with the base stage of PNP bipolar transistor with one end of the second amplitude limit electric capacity; Described 4th divider resistance and the other end of the second amplitude limit electric capacity and the collector of PNP bipolar transistor are all connected to reference on the ground.
Described first amplitude limit control voltage and the second amplitude limit control voltage are external dc voltage source, and the first amplitude limit control voltage is lower than reference ground voltage, and the second amplitude limit control voltage is higher than reference ground voltage.
Compared with prior art, its advantage and beneficial effect are in the present invention: circuit structure is simple, and amplitude limit precision is high, can conveniently change limiting voltage size.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of overvoltage crowbar of the present invention.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
As shown in Figure 1, the overvoltage crowbar described in the present embodiment, includes signal input part Vs, signal processing circuit, low pressure amplitude limiter circuit, high pressure amplitude limiter circuit, and wherein, described signal input part Vs is connected to input resistance Ri; Described low pressure amplitude limiter circuit comprises the first amplitude limit control voltage Ve, the first divider resistance R1, the second divider resistance R2, the first amplitude limit electric capacity C1 and NPN bipolar transistor Q1; Described high pressure amplitude limiter circuit comprises the second amplitude limit control voltage Vc, the 3rd divider resistance R3, the 4th divider resistance R4, the second amplitude limit electric capacity C2 and PNP bipolar transistor Q2; The emitter of described NPN bipolar transistor Q1 and the emitter of PNP bipolar transistor Q2 are all connected on the input end Vi of signal processing circuit; Described first divider resistance R1 is series between the first amplitude limit control voltage Ve and the base stage of NPN bipolar transistor Q1; Described second divider resistance R2 is in parallel with the first amplitude limit electric capacity C1, and this second divider resistance R2 is all connected with the base stage of NPN bipolar transistor Q1 with one end of the first amplitude limit electric capacity C1; The other end of described second divider resistance R2 and the first amplitude limit electric capacity C1 and the collector of NPN bipolar transistor Q1 are all connected to reference on ground GND; Described 3rd divider resistance R3 is series between the base stage of the second amplitude limit control voltage Vc and PNP bipolar transistor Q2; Described 4th divider resistance R4 is in parallel with the second amplitude limit electric capacity C2, and the 4th divider resistance R4 is all connected with the base stage of PNP bipolar transistor Q2 with one end of the second amplitude limit electric capacity C2; The other end of described 4th divider resistance R4 and the second amplitude limit electric capacity C2 and the collector of PNP bipolar transistor Q2 are all connected to reference on ground GND.
In addition, described first amplitude limit control voltage Ve and the second amplitude limit control voltage Vc is external dc voltage source, and the first amplitude limit control voltage Ve is lower than reference ground GND voltage, and the second amplitude limit control voltage Vc is higher than reference ground GND voltage.
Be below the principle of work of the above-mentioned overvoltage crowbar of the present embodiment, its concrete condition is as follows:
Given first amplitude limit control voltage Ve and the second amplitude limit control voltage Vc, the base voltage of NPN bipolar transistor Q1 is fixed on Va, Va=Ve × R2/ (R1+R2), the base voltage of PNP bipolar transistor Q2 is fixed on Vb, Vb=Vc × R4/ (R3+R4); As base voltage Va lower than NPN bipolar transistor Q1 of the input terminal voltage Vi of signal processing circuit, the emitter junction positively biased of NPN bipolar transistor Q1, collector junction are reverse-biased, NPN bipolar transistor Q1 is operated in magnifying state, and the base voltage Va that the input terminal voltage Vi of signal processing circuit is restricted to NPN bipolar transistor Q1 deducts its emitter junction junction voltage; As base voltage Vb higher than PNP bipolar transistor Q2 of the input terminal voltage Vi of signal processing circuit, emitter junction positively biased, the collector junction of PNP bipolar transistor Q2 are reverse-biased, PNP bipolar transistor Q2 is operated in magnifying state, and the base voltage Vb that the input terminal voltage Vi of signal processing circuit is restricted to PNP bipolar transistor Q2 adds its emitter junction junction voltage.First amplitude limit electric capacity C1 and the second amplitude limit electric capacity C2 plays filter action to Va and Vb respectively.
The examples of implementation of the above are only the preferred embodiment of the present invention, not limit practical range of the present invention with this, therefore the change that all shapes according to the present invention, principle are done, all should be encompassed in protection scope of the present invention.
Claims (2)
1. an overvoltage crowbar, it is characterized in that: comprise signal input part (Vs), signal processing circuit, low pressure amplitude limiter circuit, high pressure amplitude limiter circuit, wherein, described signal input part (Vs) is connected with the input end (Vi) of signal processing circuit through input resistance (Ri); Described low pressure amplitude limiter circuit comprises the first amplitude limit control voltage (Ve), the first divider resistance (R1), the second divider resistance (R2), the first amplitude limit electric capacity (C1) and NPN bipolar transistor (Q1); Described high pressure amplitude limiter circuit comprises the second amplitude limit control voltage (Vc), the 3rd divider resistance (R3), the 4th divider resistance (R4), the second amplitude limit electric capacity (C2) and PNP bipolar transistor (Q2); The emitter of described NPN bipolar transistor (Q1) and the emitter of PNP bipolar transistor (Q2) are all connected on the input end (Vi) of signal processing circuit; Described first divider resistance (R1) is series between the first amplitude limit control voltage (Ve) and the base stage of NPN bipolar transistor (Q1); Described second divider resistance (R2) is in parallel with the first amplitude limit electric capacity (C1), and this second divider resistance (R2) is all connected with the base stage of NPN bipolar transistor (Q1) with one end of the first amplitude limit electric capacity (C1); The other end of described second divider resistance (R2) and the first amplitude limit electric capacity (C1) and the collector of NPN bipolar transistor (Q1) be all connected to reference on (GND); Described 3rd divider resistance (R3) is series between the second amplitude limit control voltage (Vc) and the base stage of PNP bipolar transistor (Q2); Described 4th divider resistance (R4) is in parallel with the second amplitude limit electric capacity (C2), and the 4th divider resistance (R4) is all connected with the base stage of PNP bipolar transistor (Q2) with one end of the second amplitude limit electric capacity (C2); Described 4th divider resistance (R4) and the other end of the second amplitude limit electric capacity (C2) and the collector of PNP bipolar transistor (Q2) be all connected to reference on (GND).
2. a kind of overvoltage crowbar according to claim 1; it is characterized in that: described first amplitude limit control voltage (Ve) and the second amplitude limit control voltage (Vc) are external dc voltage source; and the first amplitude limit control voltage (Ve) lower than with reference to (GND) voltage, the second amplitude limit control voltage (Vc) higher than with reference to (GND) voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510131478.2A CN104750159B (en) | 2015-03-24 | 2015-03-24 | A kind of overvoltage crowbar |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510131478.2A CN104750159B (en) | 2015-03-24 | 2015-03-24 | A kind of overvoltage crowbar |
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| CN104750159A CN104750159A (en) | 2015-07-01 |
| CN104750159B true CN104750159B (en) | 2016-04-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108460553B (en) * | 2018-01-31 | 2021-08-31 | 北京戴纳实验科技有限公司 | Spare part purchasing system and method |
| CN110455380A (en) * | 2018-01-31 | 2019-11-15 | 北京戴纳实验科技有限公司 | Part preliminary examination examining system |
| CN109490402A (en) * | 2018-12-26 | 2019-03-19 | 福建万安华科电子科技有限公司 | A kind of ion mobility spectrometry alarm |
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|---|---|---|---|---|
| CN101071950A (en) * | 2006-05-09 | 2007-11-14 | 罗姆股份有限公司 | Charging circuit, over-voltage protection circuit |
| CN101188356A (en) * | 2006-11-21 | 2008-05-28 | 半导体元件工业有限责任公司 | Protection circuit and its method |
| EP2345947A2 (en) * | 2007-03-30 | 2011-07-20 | Hamilton Sundstrand Corporation | Surge protected power supply |
| JP2012204809A (en) * | 2011-03-28 | 2012-10-22 | Asahi Kasei Electronics Co Ltd | Overvoltage protection circuit |
| CN204515579U (en) * | 2015-03-24 | 2015-07-29 | 华南理工大学 | A kind of overvoltage crowbar |
-
2015
- 2015-03-24 CN CN201510131478.2A patent/CN104750159B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101071950A (en) * | 2006-05-09 | 2007-11-14 | 罗姆股份有限公司 | Charging circuit, over-voltage protection circuit |
| CN101188356A (en) * | 2006-11-21 | 2008-05-28 | 半导体元件工业有限责任公司 | Protection circuit and its method |
| EP2345947A2 (en) * | 2007-03-30 | 2011-07-20 | Hamilton Sundstrand Corporation | Surge protected power supply |
| JP2012204809A (en) * | 2011-03-28 | 2012-10-22 | Asahi Kasei Electronics Co Ltd | Overvoltage protection circuit |
| CN204515579U (en) * | 2015-03-24 | 2015-07-29 | 华南理工大学 | A kind of overvoltage crowbar |
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| CN104750159A (en) | 2015-07-01 |
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Effective date of registration: 20170426 Address after: 515000 Guangdong city of Shantou province in Jingyu jade Lane 21 Patentee after: Shantou sunrise Electrical Equipment Co., Ltd. Address before: 510640 Tianhe District, Guangdong, No. five road, No. 381, Patentee before: South China University of Technology |
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| CB03 | Change of inventor or designer information |
Inventor after: Huang Xubin Inventor after: Liu Xiqin Inventor before: Wang Jian Inventor before: Wu Lemao Inventor before: Tian Lianfang |
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Address after: 515000 Guangdong city of Shantou province in Jingyu jade Lane 21 Patentee after: Guangdong Asahi Electrical Equipment Co., Ltd. Address before: 515000 Guangdong city of Shantou province in Jingyu jade Lane 21 Patentee before: Shantou sunrise Electrical Equipment Co., Ltd. |