CN206850404U - A kind of line under-voltage protection circuit with the input of retarding window wide scope - Google Patents

A kind of line under-voltage protection circuit with the input of retarding window wide scope Download PDF

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Publication number
CN206850404U
CN206850404U CN201720568310.2U CN201720568310U CN206850404U CN 206850404 U CN206850404 U CN 206850404U CN 201720568310 U CN201720568310 U CN 201720568310U CN 206850404 U CN206850404 U CN 206850404U
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China
Prior art keywords
resistance
comparator
input
circuit
voltage
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Expired - Fee Related
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CN201720568310.2U
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Chinese (zh)
Inventor
杨正男
胡进
张石磊
吴磊
袁宝山
郭靖
赵隆冬
胡海斌
马升杰
刘航志
王粤桦
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CETC 43 Research Institute
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CETC 43 Research Institute
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Priority to CN201720568310.2U priority Critical patent/CN206850404U/en
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Publication of CN206850404U publication Critical patent/CN206850404U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

It the utility model is related to a kind of line under-voltage protection circuit with the input of retarding window wide scope; including comparator N3, a reference source N1, bleeder circuit, mu balanced circuit and on-off circuit; comparator N3 inverting input is connected at the node between two series resistance R2, resistance R3; resistance R3 other end ground connection, the resistance R2 other end is voltage input end;Comparator N3 in-phase input end is connected through resistance R4 with a reference source N1 negative electrode, the plus earth of a reference source N1, its reference edge is grounded through electric capacity C1, the output end of the comparator N3 is connected with the input of on-off circuit, and comparator N3 in-phase input end is connected through resistance R5 with its output end, the input end grounding of the mu balanced circuit, its output end are connected with comparator N3 inverting input.The utility model circuit is simple, is not likely to produce false triggering, and stability is preferable, there is a stronger antijamming capability, and reliability is higher.

Description

A kind of line under-voltage protection circuit with the input of retarding window wide scope
Technical field
It the utility model is related to a kind of line under-voltage protection circuit, and in particular to one kind has the input of retarding window wide scope Line under-voltage protection circuit.
Background technology
Input undervoltage protection circuit is the core protection location of power module, and its effect is the input voltage of module less than just During normal operating voltage range, module is turned off, protection module internal components are injury-free.Conventional input undervoltage protection circuit exists Nearby output voltage easily produces vibration, the easy false triggering of circuit, poor anti jamming capability to under-voltage protection point.
Utility model content
The purpose of this utility model is to provide a kind of line under-voltage protection circuit with the input of retarding window wide scope, It is not likely to produce false triggering, strong antijamming capability.
To achieve the above object, the utility model employs following technical scheme:
It is a kind of with retarding window wide scope input line under-voltage protection circuit, including comparator N3, a reference source N1, point Volt circuit, mu balanced circuit and on-off circuit, the bleeder circuit are composed in series by resistance R2 and resistance R3, the comparator N3's Inverting input is connected between resistance R2 and resistance R3, resistance R3 other end ground connection, and the resistance R2 other end is defeated for voltage Enter end;Comparator N3 in-phase input end is connected through resistance R4 with a reference source N1 negative electrode, the plus earth of a reference source N1, Its reference edge is grounded through electric capacity C1, and the output end of the comparator N3 is connected with the input of on-off circuit, and comparator N3 In-phase input end is connected through resistance R5 with its output end, the input end grounding of the mu balanced circuit, its output end and comparator N3 Inverting input be connected.
Negative electrode of the mu balanced circuit including voltage-stabiliser tube N2 and electric capacity C2, the voltage-stabiliser tube N2 is anti-phase defeated with comparator N3's Enter end to be connected, voltage-stabiliser tube N2 plus earth, the electric capacity C2 is parallel to voltage-stabiliser tube N2 both ends.
The on-off circuit includes diode V1, resistance R6 and triode V2, the anode and comparator of the diode V1 N3 output end is connected, and diode V1 negative electrode is connected through resistance R6 with triode V2 base stage, the current collection of the triode V2 The extremely output end of on-off circuit, its grounded emitter.
As shown from the above technical solution, the line under-voltage described in the utility model with the input of retarding window wide scope is protected The cut-in voltage of protection circuit and shut-off voltage have certain window voltage, after comparator circuit introduces positive feedback in circuit, due to In the presence of two different triggering levels, when requiring that comparator output level changes round about, input voltage value must have Certain variable quantity just can be with.Therefore, circuit is not likely to produce false triggering, and stability is preferable, has stronger antijamming capability, reliably Property is higher.
Brief description of the drawings
Fig. 1 is circuit diagram of the present utility model.
Embodiment
The utility model is described further below in conjunction with the accompanying drawings:
As shown in figure 1, the present embodiment has the line under-voltage protection circuit of retarding window wide scope input, including compare Device N3, a reference source N1, bleeder circuit, mu balanced circuit and on-off circuit, bleeder circuit are composed in series by resistance R2 and resistance R3, than Inverting input compared with device N3 is connected between resistance R2 and resistance R3, resistance R3 other end ground connection, the resistance R2 other end For the voltage input end of the line under-voltage protection circuit;Negative electrode of the comparator N3 in-phase input end through resistance R4 Yu a reference source N1 It is connected, a reference source N1 plus earth, its reference edge is grounded through electric capacity C1, comparator N3 output end and the input of on-off circuit End is connected, and comparator N3 in-phase input end is connected through resistance R5 with its output end, and the input end grounding of mu balanced circuit, its is defeated Go out end with comparator N3 inverting input to be connected.
In the present embodiment, the mu balanced circuit includes voltage-stabiliser tube N2 and electric capacity C2, and voltage-stabiliser tube N2 negative electrode is with comparator N3's Inverting input is connected, and voltage-stabiliser tube N2 plus earth, electric capacity C2 is parallel to voltage-stabiliser tube N2 both ends.On-off circuit includes two poles Pipe V1, resistance R6 and triode V2, diode V1 anode are connected with comparator N3 output end, and diode V1 negative electrode is through electricity Resistance R6 is connected with triode V2 base stage, the output end of triode V2 current collection extremely on-off circuit, its grounded emitter.
Operation principle:If the voltage at a reference source N1 both ends is Vref, the high level of comparator N3 outputs is VH, now same phase The voltage of input is VRH;The low level of comparator N3 outputs is VL, the now voltage V of in-phase endRL.Input voltage VIBy electricity R2 is hindered, R3 partial pressures are sent into comparator N3 reverse input ends, when the voltage of comparator N3 inverting inputs is less than VRLWhen, comparator N3 High level is exported, triode V2 conductings, it is low level to be connected to PWM controller COMP ends, so as to turn off pwm pulse output, mould Block is without output.When the voltage of comparator N3 inverting inputs is more than VRHWhen, comparator N3 output low levels, triode V2 shut-offs, It is high level to be connected to PWM controller COMP ends, and pwm pulse output is normal, module also normal work.
Embodiment described above is only that preferred embodiment of the present utility model is described, not to this practicality New scope is defined, and on the premise of the utility model design spirit is not departed from, those of ordinary skill in the art are to this The various modifications and improvement that the technical scheme of utility model is made, the protection of the utility model claims book determination all should be fallen into In the range of.

Claims (3)

  1. A kind of 1. line under-voltage protection circuit with the input of retarding window wide scope, it is characterised in that:Including comparator N3, base Quasi- source N1, bleeder circuit, mu balanced circuit and on-off circuit, the bleeder circuit is composed in series by resistance R2 and resistance R3, described Comparator N3 inverting input is connected between resistance R2 and resistance R3, and resistance R3 other end ground connection, resistance R2's is another Hold as voltage input end;Comparator N3 in-phase input end is connected through resistance R4 with a reference source N1 negative electrode, a reference source N1 Plus earth, its reference edge is grounded through electric capacity C1, and the output end of the comparator N3 is connected with the input of on-off circuit, and Comparator N3 in-phase input end is connected through resistance R5 with its output end, the input end grounding of the mu balanced circuit, its output end It is connected with comparator N3 inverting input.
  2. 2. the line under-voltage protection circuit according to claim 1 with the input of retarding window wide scope, it is characterised in that: The mu balanced circuit includes voltage-stabiliser tube N2 and electric capacity C2, the negative electrode of the voltage-stabiliser tube N2 and comparator N3 inverting input phase Even, voltage-stabiliser tube N2 plus earth, the electric capacity C2 is parallel to voltage-stabiliser tube N2 both ends.
  3. 3. the line under-voltage protection circuit according to claim 1 with the input of retarding window wide scope, it is characterised in that: The on-off circuit includes diode V1, resistance R6 and triode V2, the anode of the diode V1 and comparator N3 output End is connected, and diode V1 negative electrode is connected through resistance R6 with triode V2 base stage, and the current collection of the triode V2 extremely switchs The output end of circuit, its grounded emitter.
CN201720568310.2U 2017-05-22 2017-05-22 A kind of line under-voltage protection circuit with the input of retarding window wide scope Expired - Fee Related CN206850404U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201720568310.2U CN206850404U (en) 2017-05-22 2017-05-22 A kind of line under-voltage protection circuit with the input of retarding window wide scope

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201720568310.2U CN206850404U (en) 2017-05-22 2017-05-22 A kind of line under-voltage protection circuit with the input of retarding window wide scope

Publications (1)

Publication Number Publication Date
CN206850404U true CN206850404U (en) 2018-01-05

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CN201720568310.2U Expired - Fee Related CN206850404U (en) 2017-05-22 2017-05-22 A kind of line under-voltage protection circuit with the input of retarding window wide scope

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106972461A (en) * 2017-05-22 2017-07-21 中国电子科技集团公司第四十三研究所 A kind of line under-voltage protection circuit inputted with retarding window wide scope
CN116859814A (en) * 2023-09-04 2023-10-10 巨翊医疗科技(苏州)有限公司 Dual-MCU safety control method and system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106972461A (en) * 2017-05-22 2017-07-21 中国电子科技集团公司第四十三研究所 A kind of line under-voltage protection circuit inputted with retarding window wide scope
CN116859814A (en) * 2023-09-04 2023-10-10 巨翊医疗科技(苏州)有限公司 Dual-MCU safety control method and system
CN116859814B (en) * 2023-09-04 2023-12-19 巨翊医疗科技(苏州)有限公司 Dual-MCU safety control method and system

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Granted publication date: 20180105