CN106972461A - A kind of line under-voltage protection circuit inputted with retarding window wide scope - Google Patents
A kind of line under-voltage protection circuit inputted with retarding window wide scope Download PDFInfo
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- CN106972461A CN106972461A CN201710361570.7A CN201710361570A CN106972461A CN 106972461 A CN106972461 A CN 106972461A CN 201710361570 A CN201710361570 A CN 201710361570A CN 106972461 A CN106972461 A CN 106972461A
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- resistance
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
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- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of line under-voltage protection circuit inputted with 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 is connected with comparator N3 inverting input.Circuit of the present invention is simple, be not likely to produce false triggering, and stability preferably, has stronger antijamming capability, reliability is higher.
Description
Technical field
The present invention relates to a kind of line under-voltage protection circuit, and in particular to a kind of electricity inputted with retarding window wide scope
Source under-voltage protecting 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.
The content of the invention
It is an object of the invention to provide a kind of line under-voltage protection circuit inputted with retarding window wide scope, it is difficult
Produce false triggering, strong antijamming capability.
To achieve the above object, present invention employs following technical scheme:
A kind of line under-voltage protection circuit inputted with retarding window wide scope, including comparator N3, a reference source N1, partial pressure electricity
Road, mu balanced circuit and on-off circuit, the bleeder circuit are composed in series by resistance R2 and resistance R3, and the comparator N3's is anti-phase
Input is connected between resistance R2 and resistance R3, resistance R3 other end ground connection, and 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, and it is joined
Examine end to be grounded through electric capacity C1, the output end of the comparator N3 is connected with the input of on-off circuit, and comparator N3 same phase
Input is connected through resistance R5 with its output end, the input end grounding of the mu balanced circuit, and its output end is anti-with comparator N3's
Phase input is 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 two 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 protection electricity of the present invention inputted with retarding window wide scope
The cut-in voltage on road has comparator circuit in certain window voltage, circuit to introduce after positive feedback with shut-off voltage, due to existing
Two different triggering levels, when requiring that comparator output level changes round about, input voltage value must have necessarily
Variable quantity just can be with.Therefore, circuit is not likely to produce false triggering, and stability preferably, there is a stronger antijamming capability, reliability compared with
It is high.
Brief description of the drawings
Fig. 1 is the circuit diagram of the present invention.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings:
As shown in figure 1, the present embodiment has the line under-voltage protection circuit that retarding window wide scope is inputted, including comparator
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, are compared
Device N3 inverting input is connected between resistance R2 and resistance R3, resistance R3 other end ground connection, and the resistance R2 other end is
The voltage input end of the line under-voltage protection circuit;Negative electrode phase of the comparator N3 in-phase input end through resistance R4 and a reference source N1
Even, 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
It is connected, and comparator N3 in-phase input end is connected through resistance R5 with its output end, the input end grounding of mu balanced circuit, it is exported
End is connected with comparator N3 inverting input.
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 two 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 two 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
Hinder R2, R3 partial pressures feeding 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 are connected to PWM controller COMP ends for low level, 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,
PWM controller COMP ends are connected to for high level, pwm pulse output is normal, module also normal work.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, technical side of the those of ordinary skill in the art to the present invention
In various modifications and improvement that case is made, the protection domain that claims of the present invention determination all should be fallen into.
Claims (3)
1. a kind of line under-voltage protection circuit inputted with 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 are composed in series by resistance R2 and resistance R3, described
Comparator N3 inverting input is connected between resistance R2 and resistance R3, resistance R3 other end ground connection, and 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. the line under-voltage protection circuit according to claim 1 inputted with 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 two ends.
3. the line under-voltage protection circuit according to claim 1 inputted with 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 is extremely switched
The output end of circuit, its grounded emitter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201710361570.7A CN106972461A (en) | 2017-05-22 | 2017-05-22 | A kind of line under-voltage protection circuit inputted with retarding window wide scope |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN201710361570.7A CN106972461A (en) | 2017-05-22 | 2017-05-22 | A kind of line under-voltage protection circuit inputted with retarding window wide scope |
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CN106972461A true CN106972461A (en) | 2017-07-21 |
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CN201710361570.7A Pending CN106972461A (en) | 2017-05-22 | 2017-05-22 | A kind of line under-voltage protection circuit inputted with retarding window wide scope |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112542818A (en) * | 2019-09-23 | 2021-03-23 | 中车株洲电力机车研究所有限公司 | Input undervoltage protection circuit and power panel comprising same |
CN113300322A (en) * | 2021-05-11 | 2021-08-24 | 深圳青铜剑技术有限公司 | Undervoltage protection circuit and high-voltage-resistant integrated circuit with undervoltage protection circuit |
RU226931U1 (en) * | 2024-06-04 | 2024-06-28 | Общество с ограниченной ответственностью "ИГплюс" | Microphone with protection against electrical damage |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2059279U (en) * | 1989-05-02 | 1990-07-11 | 南京钟航电子技术开发公司 | Fully automatic conditioner (refrigerator) protector |
CN201319558Y (en) * | 2008-11-24 | 2009-09-30 | 中兴通讯股份有限公司 | Under-voltage locking circuit |
CN101707347A (en) * | 2009-10-21 | 2010-05-12 | 海洋王照明科技股份有限公司 | Undervoltage protection circuit and LED drive circuit |
CN105610129A (en) * | 2015-12-25 | 2016-05-25 | 广州金升阳科技有限公司 | Sampling circuit and overvoltage and under-voltage protection control circuit |
CN206850404U (en) * | 2017-05-22 | 2018-01-05 | 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 with the input of retarding window wide scope |
-
2017
- 2017-05-22 CN CN201710361570.7A patent/CN106972461A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2059279U (en) * | 1989-05-02 | 1990-07-11 | 南京钟航电子技术开发公司 | Fully automatic conditioner (refrigerator) protector |
CN201319558Y (en) * | 2008-11-24 | 2009-09-30 | 中兴通讯股份有限公司 | Under-voltage locking circuit |
CN101707347A (en) * | 2009-10-21 | 2010-05-12 | 海洋王照明科技股份有限公司 | Undervoltage protection circuit and LED drive circuit |
CN105610129A (en) * | 2015-12-25 | 2016-05-25 | 广州金升阳科技有限公司 | Sampling circuit and overvoltage and under-voltage protection control circuit |
CN206850404U (en) * | 2017-05-22 | 2018-01-05 | 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 with the input of retarding window wide scope |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112542818A (en) * | 2019-09-23 | 2021-03-23 | 中车株洲电力机车研究所有限公司 | Input undervoltage protection circuit and power panel comprising same |
CN113300322A (en) * | 2021-05-11 | 2021-08-24 | 深圳青铜剑技术有限公司 | Undervoltage protection circuit and high-voltage-resistant integrated circuit with undervoltage protection circuit |
RU226931U1 (en) * | 2024-06-04 | 2024-06-28 | Общество с ограниченной ответственностью "ИГплюс" | Microphone with protection against electrical damage |
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PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170721 |
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RJ01 | Rejection of invention patent application after publication |