CN104218562A - Direct-current power source lightning protection circuit - Google Patents

Direct-current power source lightning protection circuit Download PDF

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Publication number
CN104218562A
CN104218562A CN201410518069.3A CN201410518069A CN104218562A CN 104218562 A CN104218562 A CN 104218562A CN 201410518069 A CN201410518069 A CN 201410518069A CN 104218562 A CN104218562 A CN 104218562A
Authority
CN
China
Prior art keywords
protection circuit
resistance
piezo
transient diode
power supply
Prior art date
Application number
CN201410518069.3A
Other languages
Chinese (zh)
Inventor
徐晓青
Original Assignee
成都思迈科技发展有限责任公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 成都思迈科技发展有限责任公司 filed Critical 成都思迈科技发展有限责任公司
Priority to CN201410518069.3A priority Critical patent/CN104218562A/en
Publication of CN104218562A publication Critical patent/CN104218562A/en

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Abstract

The invention discloses a direct-current power source lightning protection circuit which comprises a first-level protection circuit and a second-level protection circuit in parallel connection. The direct-current power source lightning protection circuit is characterized in that in the current direction, the first-level protection circuit is located in front of the second-level protection circuit. The first-level protection circuit comprises a voltage dependent resistor R1, a voltage dependent resistor R2 and a gas discharge tube GDT, wherein two ends of the voltage dependent resistor R1 and the voltage dependent resistor R2 are connected onto the positive pole and the negative pole of a power input respectively after the voltage dependent resistor R1 and the voltage dependent resistor R2 are connected in series. One end of the gas discharge tube GDT is connected onto the connection position of the voltage dependent resistor R1 and the voltage dependent resistor R2, and the other end of the gas discharge tube GDT is grounded. The second-level protection circuit comprises a transient diode D1 and a transient diode D2. Two ends of a circuit formed after the transient diode D1 and a transient diode D2 are connected in series are connected onto the positive pole and the negative pole of the power input respectively, and the connection position of the transient diode D1 and a transient diode D2 are grounded.

Description

DC power supply lightning protection circuit
Technical field
The present invention relates to a kind of lightning protection circuit, particularly relate to a kind of DC power supply lightning protection circuit.
Background technology
The damage that DC power supply lightning protection device causes DC power system and power consumption equipment for preventing lightning overvoltage and transient overvoltage, the safety of proterctive equipment and user.Be widely used in the DC power supply protection of the systems such as mobile communication base station, microwave communication office (station), telecommunications room, factory, civil aviaton, finance, security.Be applicable to various DC power system, as: DC distributor; DC suppling equipment; Direct-current power distribution cabinet; Electronic information cabinet; The output of secondary power supply equipment.
In the lightning protection circuit of existing DC power supply, general is all adopt transient diode fast reaction to be conducting to ground, but, transient diode can not bear the pulse of repetition, after there is multiple pulses, probably cause transient diode to damage, the follow-up load disappearance lightning protection circuit made, thus cause damage.
Summary of the invention
Namely object of the present invention is the deficiency overcoming present technology, a kind of DC power supply lightning protection circuit is provided, solves the transient diode lightning protection circuit of existing employing, run into multiple-pulse surge electric current time, lightning protection can not be carried out well, cause the defect that follow-up load damages.
The present invention is achieved through the following technical solutions: DC power supply lightning protection circuit, comprise first order protection circuit in parallel and second level protection circuit, along the sense of current, first order protection circuit is positioned at the front of second level protection circuit, first order protection circuit comprises piezo-resistance R1, piezo-resistance R2 and discharge tube GDT, after piezo-resistance R1 and piezo-resistance R2 series connection, two ends are connected respectively to positive pole and the negative pole of power supply input, one end of discharge tube GDT is connected to the junction of piezo-resistance R1 and piezo-resistance R2, other end ground connection, described second level protection circuit comprises transient diode D1 and transient diode D2, circuit two ends after described transient diode D1 and transient diode D2 connects are connected respectively to positive pole and the negative pole of power supply input, and the junction ground connection of transient diode D1 and transient diode D2.This lightning protection circuit, be designed to two-stage protection circuit, in first order protection circuit, piezo-resistance R1 and piezo-resistance R2, when experiencing overvoltage, namely resistance diminish, electric current is made sharply to become large, reach the On current of GDT, thus current lead-through of surging enters ground, first order protection circuit is realized by piezo-resistance, but piezo-resistance reaction is slow, have residual voltage and drain to subsequent conditioning circuit, may impact electrical equipment, so second level protection circuit is for absorbing residual voltage, so adopt transient diode to absorb, transient diode mainly reaction speed is fast, sense residual voltage, conducting can enter ground rapidly, when there is continuous print surge current, piezo-resistance in first order protection circuit is also in conducting state, so follow-up residual voltage there will not be, also ensure that the safety of transient diode, also ensure that the safety of load.
Further, the first above-mentioned protection circuit is also parallel with piezo-resistance R3, positive pole and the negative pole place of power supply input are respectively arranged with a temperature fuse resistance.When piezo-resistance reaches capacity, there is short circuit, electronic device is burnt; so set temperature insurance resistance, after sensing temperature, i.e. open circuit; and be provided with preposition piezo-resistance R3, after R3 first occurs short circuit, be namely disconnected circuit, protect the first protection circuit below.
Further, the second above-mentioned protection circuit is also parallel with a transient diode D3, almost, burn when being and preventing the second protection circuit from reaching capacity, it first burns for transient diode D3 and piezo-resistance R3 effect, makes temperature fuse resistance react short circuit.
The invention has the beneficial effects as follows: arrange two protection circuits, the first protection circuit adopts piezo-resistance, although because reaction speed is slow, have residual voltage to produce, but when there is continuous print pulse, because piezo-resistance is also in running order, the perfect earial drainage of meeting, do not have residual voltage to produce, so be the follow-up for once residual voltage of continuous impulse, namely the second protection circuit is adopt transient diode, as long as in the face of a residual voltage, and do not have continuous print residual voltage, the work making circuit very stable.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but structure of the present invention is not limited only to following examples:
[embodiment]
As shown in Figure 1, DC power supply lightning protection circuit, comprise first order protection circuit in parallel and second level protection circuit, along the sense of current, first order protection circuit is positioned at the front of second level protection circuit, first order protection circuit comprises piezo-resistance R1, piezo-resistance R2 and discharge tube GDT, after piezo-resistance R1 and piezo-resistance R2 series connection, two ends are connected respectively to positive pole and the negative pole of power supply input, one end of discharge tube GDT is connected to the junction of piezo-resistance R1 and piezo-resistance R2, other end ground connection, described second level protection circuit comprises transient diode D1 and transient diode D2, circuit two ends after described transient diode D1 and transient diode D2 connects are connected respectively to positive pole and the negative pole of power supply input, and the junction ground connection of transient diode D1 and transient diode D2.This lightning protection circuit, be designed to two-stage protection circuit, in first order protection circuit, piezo-resistance R1 and piezo-resistance R2, when experiencing overvoltage, namely resistance diminish, electric current is made sharply to become large, reach the On current of GDT, thus current lead-through of surging enters ground, first order protection circuit is realized by piezo-resistance, but piezo-resistance reaction is slow, have residual voltage and drain to subsequent conditioning circuit, may impact electrical equipment, so second level protection circuit is for absorbing residual voltage, so adopt transient diode to absorb, transient diode mainly reaction speed is fast, sense residual voltage, conducting can enter ground rapidly, when there is continuous print surge current, piezo-resistance in first order protection circuit is also in conducting state, so follow-up residual voltage there will not be, also ensure that the safety of transient diode, also ensure that the safety of load.
Further, the first above-mentioned protection circuit is also parallel with piezo-resistance R3, positive pole and the negative pole place of power supply input are respectively arranged with a temperature fuse resistance.Temperature fuse resistance is; RF1 and RF2; when piezo-resistance reaches capacity, there is short circuit, electronic device is burnt; so set temperature insurance resistance; after sensing temperature, i.e. open circuit, and be provided with preposition piezo-resistance R3; after R3 first occurs short circuit, be namely disconnected circuit, protect the first protection circuit below.
Further, the second above-mentioned protection circuit is also parallel with a transient diode D3, almost, burn when being and preventing the second protection circuit from reaching capacity, it first burns for transient diode D3 and piezo-resistance R3 effect, makes temperature fuse resistance react short circuit.

Claims (3)

1. DC power supply lightning protection circuit, it is characterized in that: comprise first order protection circuit in parallel and second level protection circuit, along the sense of current, first order protection circuit is positioned at the front of second level protection circuit, first order protection circuit comprises piezo-resistance R1, piezo-resistance R2 and discharge tube GDT, after piezo-resistance R1 and piezo-resistance R2 series connection, two ends are connected respectively to positive pole and the negative pole of power supply input, one end of discharge tube GDT is connected to the junction of piezo-resistance R1 and piezo-resistance R2, other end ground connection, described second level protection circuit comprises transient diode D1 and transient diode D2, circuit two ends after described transient diode D1 and transient diode D2 connects are connected respectively to positive pole and the negative pole of power supply input, and the junction ground connection of transient diode D1 and transient diode D2.
2. DC power supply lightning protection circuit according to claim 1, is characterized in that: the first described protection circuit is also parallel with piezo-resistance R3, and positive pole and the negative pole place of power supply input are respectively arranged with a temperature fuse resistance.
3. DC power supply lightning protection circuit according to claim 1, is characterized in that: the second described protection circuit is also parallel with a transient diode D3.
CN201410518069.3A 2014-09-30 2014-09-30 Direct-current power source lightning protection circuit CN104218562A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410518069.3A CN104218562A (en) 2014-09-30 2014-09-30 Direct-current power source lightning protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410518069.3A CN104218562A (en) 2014-09-30 2014-09-30 Direct-current power source lightning protection circuit

Publications (1)

Publication Number Publication Date
CN104218562A true CN104218562A (en) 2014-12-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410518069.3A CN104218562A (en) 2014-09-30 2014-09-30 Direct-current power source lightning protection circuit

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CN (1) CN104218562A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5327319A (en) * 1991-08-27 1994-07-05 At&T Bell Laboratories Common mode voltage surge protection circuitry
CN201636674U (en) * 2009-06-10 2010-11-17 黄爱国 Lightning protection led street lamp
CN202917967U (en) * 2012-07-26 2013-05-01 京信通信技术(广州)有限公司 Lightning protection device of direct-current power supply
WO2014067272A1 (en) * 2012-10-31 2014-05-08 华为技术有限公司 Protective apparatus
CN104009455A (en) * 2014-05-21 2014-08-27 国网四川省电力公司成都市新都供电分公司 Electric transmission line monitoring system protecting device for lightning protection

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5327319A (en) * 1991-08-27 1994-07-05 At&T Bell Laboratories Common mode voltage surge protection circuitry
CN201636674U (en) * 2009-06-10 2010-11-17 黄爱国 Lightning protection led street lamp
CN202917967U (en) * 2012-07-26 2013-05-01 京信通信技术(广州)有限公司 Lightning protection device of direct-current power supply
WO2014067272A1 (en) * 2012-10-31 2014-05-08 华为技术有限公司 Protective apparatus
CN104009455A (en) * 2014-05-21 2014-08-27 国网四川省电力公司成都市新都供电分公司 Electric transmission line monitoring system protecting device for lightning protection

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
盛财旺等: "三种低压交流电源系统防雷保护", 《电瓷避雷器》 *

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Application publication date: 20141217