CN102780204A - Under-voltage protection circuit and lamp - Google Patents
Under-voltage protection circuit and lamp Download PDFInfo
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- CN102780204A CN102780204A CN2011101196523A CN201110119652A CN102780204A CN 102780204 A CN102780204 A CN 102780204A CN 2011101196523 A CN2011101196523 A CN 2011101196523A CN 201110119652 A CN201110119652 A CN 201110119652A CN 102780204 A CN102780204 A CN 102780204A
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Abstract
The invention relates to the protection circuit field and particularly relates to an under-voltage protection circuit and a lamp. The under-voltage protection circuit is composed of discrete components. When a power source output voltage is low, the power source output voltage can be cut off, and the purpose of under-voltage protection is achieved. The under-voltage protection circuit is simple in structure and low in cost.
Description
Technical field
The invention belongs to the protective circuit field, relate in particular to a kind of under-voltage protecting circuit and light fixture.
Background technology
Electric energy and our life are closely bound up; The normal operation of various electronic products such as electronic equipment, electronic instrument all be unable to do without electric energy; And every kind of electronic product has very big dependence to the voltage of power supply, and power supply voltage can not arbitrarily fluctuate, for example; Supply voltage can not diminish suddenly and be lower than the under-voltage protection voltage of setting, otherwise will damage the power supply circuits of electronic product.Mostly the existing protective circuit that prevents that supply voltage is lower than the under-voltage protection voltage of setting is through single-chip microcomputer sampled voltage and output control; Although adopt Single-chip Controlling to have the efficient height, use advantages such as flexible; Therefore but single-chip microcomputer need cooperate multiple devices such as a reference source and sample circuit to work, and has big, the complex structure of taking up room, many shortcomings such as with high costs.
Summary of the invention
The object of the present invention is to provide a kind of under-voltage protecting circuit, be intended to solve present under-voltage protecting circuit and have complex structure, problem with high costs.
The present invention is achieved in that a kind of under-voltage protecting circuit, is connected between power supply and the power circuit, and said under-voltage protecting circuit comprises:
Voltage-stabiliser tube D1, divider resistance R1, divider resistance R2, divider resistance R3, P type metal-oxide-semiconductor Q2 and switching tube;
The source electrode of said P type metal-oxide-semiconductor Q2 is the said positive source of input termination of under-voltage protecting circuit; The drain electrode of said P type metal-oxide-semiconductor Q2 is the output termination power circuit of under-voltage protecting circuit; The negative electrode of said voltage-stabiliser tube D1 connects said positive source; The anode of said voltage-stabiliser tube D1 is through the divider resistance R1 and the divider resistance R2 ground connection of series connection, and said control end of switching tube connects the public connecting end of said divider resistance R1 and divider resistance R2, the cold end ground connection of said switching tube; The grid of the high potential termination P type metal-oxide-semiconductor Q2 of said switching tube, said divider resistance R3 is connected between the hot end of positive source and switching tube.
Another object of the present invention is to provide a kind of light fixture, comprise the under-voltage protecting circuit that is connected between power supply and the lamp circuit, said under-voltage protecting circuit comprises:
Voltage-stabiliser tube D1, divider resistance R1, divider resistance R2, divider resistance R3, P type metal-oxide-semiconductor Q2 and switching tube;
The source electrode of said P type metal-oxide-semiconductor Q2 is the said positive source of input termination of under-voltage protecting circuit; The drain electrode of said P type metal-oxide-semiconductor Q2 is the output termination power circuit of under-voltage protecting circuit; The negative electrode of said voltage-stabiliser tube D1 connects said positive source; The anode of said voltage-stabiliser tube D1 is through the divider resistance R1 and the divider resistance R2 ground connection of series connection, and said control end of switching tube connects the public connecting end of said divider resistance R1 and divider resistance R2, the cold end ground connection of said switching tube; The grid of the high potential termination P type metal-oxide-semiconductor Q2 of said switching tube, said divider resistance R3 is connected between the hot end of positive source and switching tube.
In the present invention, this under-voltage protecting circuit adopts discrete component to constitute, and crosses when low at electric power output voltage, and the output voltage of can cutting off the electricity supply reach the purpose of under-voltage protection, and this under-voltage protecting circuit is simple in structure, with low cost.
Description of drawings
Fig. 1 is the circuit structure diagram of the under-voltage protecting circuit that provides of first embodiment of the invention;
Fig. 2 is the circuit structure diagram of the under-voltage protecting circuit that provides of second embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 shows the circuit structure of the under-voltage protecting circuit that first embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
Under-voltage protecting circuit is connected between power supply and the power circuit, and under-voltage protecting circuit comprises:
Voltage-stabiliser tube D1, divider resistance R1, divider resistance R2, divider resistance R3, P type metal-oxide-semiconductor Q2 and switching tube 101;
The source electrode of P type metal-oxide-semiconductor Q2 is the input termination positive source of under-voltage protecting circuit; The drain electrode of P type metal-oxide-semiconductor Q2 is the output termination power circuit of under-voltage protecting circuit; The negative electrode of voltage-stabiliser tube D1 connects positive source; The anode of voltage-stabiliser tube D1 is through the divider resistance R1 and the divider resistance R2 ground connection of series connection, the control termination divider resistance R1 of switching tube 101 and the public connecting end of divider resistance R2, the cold end ground connection of switching tube 101; The grid of the high potential termination P type metal-oxide-semiconductor Q2 of switching tube 101, divider resistance R3 is connected between the hot end of positive source and switching tube 101.
As first embodiment of the invention, switching tube 101 adopts triode Q1, and the base stage of triode Q1 is the control end of switching tube 101, and the current collection of triode Q1 is the hot end of switching tube 101 very, and the emission of triode Q1 is the cold end of switching tube 101 very.
Fig. 2 shows the circuit structure of the under-voltage protecting circuit that second embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
As first embodiment of the invention, switching tube 101 adopts N type metal-oxide-semiconductor Q3, and the grid of N type metal-oxide-semiconductor Q3 is the control end of switching tube 101, and the drain electrode of N type metal-oxide-semiconductor Q3 is the hot end of switching tube 101, and the source electrode of N type metal-oxide-semiconductor Q3 is the cold end of switching tube 101.
Adopting triode Q1 with switching tube 101 below is example, and the operation principle of under-voltage protecting circuit is described:
When energized and supply voltage just often; Voltage-stabiliser tube D1 punctures conducting, and triode Q1 base voltage is high level and is in conducting state that P type metal-oxide-semiconductor Q2 grid is connected to ground through triode Q1 collector and emitter; P type metal-oxide-semiconductor Q2 grid voltage is a low level; P type metal-oxide-semiconductor Q2 is in conducting state, and the source electrode of P type metal-oxide-semiconductor Q2 is straight-through with drain electrode so, and output has voltage output.
When supply voltage is lower than protection voltage; Not conducting of voltage-stabiliser tube D1; Triode Q1 base voltage is become low level and is got into off state by high level, and P type metal-oxide-semiconductor Q2 grid voltage becomes high level by low level, and P type metal-oxide-semiconductor Q2 is in off state; The source electrode of P type metal-oxide-semiconductor Q2 breaks off with drain electrode so, and output stops voltage output.
If it is normal that supply voltage recovers; This moment, voltage-stabiliser tube D1 transferred conducting state to by shutoff, and triode Q1 base stage level becomes height by low, and triode Q1 gets into conducting state; P type metal-oxide-semiconductor Q2 grid voltage becomes low level by high level; P type metal-oxide-semiconductor Q2 is in conducting state, and the source electrode of P type metal-oxide-semiconductor Q2 is straight-through with drain electrode so, the output of output recovery voltage.
The embodiment of the invention also provides a kind of light fixture, comprises the under-voltage protecting circuit that is connected between power supply and the lamp circuit, and the under-voltage protecting circuit structure repeats no more as stated here.
With respect to prior art; Under-voltage protecting circuit that the embodiment of the invention provides adopts discrete component to constitute, and crosses when low the output voltage of can cutting off the electricity supply at electric power output voltage; Reach the purpose of under-voltage protection, and this under-voltage protecting circuit is simple in structure, with low cost.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a under-voltage protecting circuit is connected between power supply and the power circuit, it is characterized in that, said under-voltage protecting circuit comprises:
Voltage-stabiliser tube D1, divider resistance R1, divider resistance R2, divider resistance R3, P type metal-oxide-semiconductor Q2 and switching tube;
The source electrode of said P type metal-oxide-semiconductor Q2 is the said positive source of input termination of under-voltage protecting circuit; The drain electrode of said P type metal-oxide-semiconductor Q2 is the output termination power circuit of under-voltage protecting circuit; The negative electrode of said voltage-stabiliser tube D1 connects said positive source; The anode of said voltage-stabiliser tube D1 is through the divider resistance R1 and the divider resistance R2 ground connection of series connection, and said control end of switching tube connects the public connecting end of said divider resistance R1 and divider resistance R2, the cold end ground connection of said switching tube; The grid of the high potential termination P type metal-oxide-semiconductor Q2 of said switching tube, said divider resistance R3 is connected between the hot end of positive source and switching tube.
2. under-voltage protecting circuit as claimed in claim 1; It is characterized in that; Said switching tube adopts triode Q1; The base stage of said triode Q1 is a control end of switching tube, and the current collection of said triode Q1 is the hot end of switching tube very, and the emission of said triode Q1 is the cold end of switching tube very.
3. under-voltage protecting circuit as claimed in claim 1; It is characterized in that; Said switching tube adopts N type metal-oxide-semiconductor Q3; The grid of said N type metal-oxide-semiconductor Q3 is a control end of switching tube, and the drain electrode of said N type metal-oxide-semiconductor Q3 is the hot end of switching tube, and the source electrode of said N type metal-oxide-semiconductor Q3 is the cold end of switching tube.
4. a light fixture comprises the under-voltage protecting circuit that is connected between power supply and the lamp circuit, it is characterized in that, said under-voltage protecting circuit comprises:
Voltage-stabiliser tube D1, divider resistance R1, divider resistance R2, divider resistance R3, P type metal-oxide-semiconductor Q2 and switching tube;
The source electrode of said P type metal-oxide-semiconductor Q2 is the said positive source of input termination of under-voltage protecting circuit; The drain electrode of said P type metal-oxide-semiconductor Q2 is the output termination power circuit of under-voltage protecting circuit; The negative electrode of said voltage-stabiliser tube D1 connects said positive source; The anode of said voltage-stabiliser tube D1 is through the divider resistance R1 and the divider resistance R2 ground connection of series connection, and said control end of switching tube connects the public connecting end of said divider resistance R1 and divider resistance R2, the cold end ground connection of said switching tube; The grid of the high potential termination P type metal-oxide-semiconductor Q2 of said switching tube, said divider resistance R3 is connected between the hot end of positive source and switching tube.
5. light fixture as claimed in claim 4; It is characterized in that said switching tube adopts triode Q1, the base stage of said triode Q1 is a control end of switching tube; The current collection of said triode Q1 is the hot end of switching tube very, and the emission of said triode Q1 is the cold end of switching tube very.
6. light fixture as claimed in claim 4; It is characterized in that said switching tube adopts N type metal-oxide-semiconductor Q3, the grid of said N type metal-oxide-semiconductor Q3 is a control end of switching tube; The drain electrode of said N type metal-oxide-semiconductor Q3 is the hot end of switching tube, and the source electrode of said N type metal-oxide-semiconductor Q3 is the cold end of switching tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101196523A CN102780204A (en) | 2011-05-10 | 2011-05-10 | Under-voltage protection circuit and lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101196523A CN102780204A (en) | 2011-05-10 | 2011-05-10 | Under-voltage protection circuit and lamp |
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| CN102780204A true CN102780204A (en) | 2012-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101196523A Pending CN102780204A (en) | 2011-05-10 | 2011-05-10 | Under-voltage protection circuit and lamp |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218521A (en) * | 2013-05-30 | 2014-12-17 | 深圳市海洋王照明工程有限公司 | A low voltage protection circuit |
| CN104821554A (en) * | 2015-05-19 | 2015-08-05 | 中国兵器工业集团第二一四研究所苏州研发中心 | DC/DC power input overvoltage and under-voltage protection device composed of voltage-stabilizing tube |
| CN105576601A (en) * | 2014-10-15 | 2016-05-11 | 博大科技股份有限公司 | Simple under-voltage protective device |
| CN106711934A (en) * | 2017-02-09 | 2017-05-24 | 昆山龙腾光电有限公司 | Power protection circuit and control method thereof |
| EP3240133A1 (en) * | 2016-04-28 | 2017-11-01 | Siemens Aktiengesellschaft | Bus participants |
| CN104779585B (en) * | 2014-01-10 | 2018-11-27 | 海洋王（东莞）照明科技有限公司 | A kind of secondary battery protection circuit |
| CN110445092A (en) * | 2019-09-09 | 2019-11-12 | 中国电子科技集团公司第四十三研究所 | It is a kind of under-voltage to open/turn off the switch circuit and switching threshold determines method |
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| CN201118796Y (en) * | 2007-11-20 | 2008-09-17 | 青岛海信电器股份有限公司 | Under voltage protection circuit |
| CN201286085Y (en) * | 2008-10-14 | 2009-08-05 | 哈尔滨九洲电气股份有限公司 | SCR self power supply gate triggering board |
| US20100220420A1 (en) * | 2009-02-27 | 2010-09-02 | Ambit Microsystems (Shanghai) Ltd. | Voltage protection circuit |
| CN101841149A (en) * | 2010-05-11 | 2010-09-22 | 海洋王照明科技股份有限公司 | Power source protection circuit and LED lamp |
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2011
- 2011-05-10 CN CN2011101196523A patent/CN102780204A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201118796Y (en) * | 2007-11-20 | 2008-09-17 | 青岛海信电器股份有限公司 | Under voltage protection circuit |
| CN201286085Y (en) * | 2008-10-14 | 2009-08-05 | 哈尔滨九洲电气股份有限公司 | SCR self power supply gate triggering board |
| US20100220420A1 (en) * | 2009-02-27 | 2010-09-02 | Ambit Microsystems (Shanghai) Ltd. | Voltage protection circuit |
| CN101841149A (en) * | 2010-05-11 | 2010-09-22 | 海洋王照明科技股份有限公司 | Power source protection circuit and LED lamp |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218521A (en) * | 2013-05-30 | 2014-12-17 | 深圳市海洋王照明工程有限公司 | A low voltage protection circuit |
| CN104779585B (en) * | 2014-01-10 | 2018-11-27 | 海洋王（东莞）照明科技有限公司 | A kind of secondary battery protection circuit |
| CN105576601A (en) * | 2014-10-15 | 2016-05-11 | 博大科技股份有限公司 | Simple under-voltage protective device |
| CN104821554A (en) * | 2015-05-19 | 2015-08-05 | 中国兵器工业集团第二一四研究所苏州研发中心 | DC/DC power input overvoltage and under-voltage protection device composed of voltage-stabilizing tube |
| EP3240133A1 (en) * | 2016-04-28 | 2017-11-01 | Siemens Aktiengesellschaft | Bus participants |
| CN107342923A (en) * | 2016-04-28 | 2017-11-10 | 西门子公司 | Device with least two bus users |
| CN107342923B (en) * | 2016-04-28 | 2020-02-28 | 西门子公司 | Device with at least two bus subscribers |
| US10666456B2 (en) | 2016-04-28 | 2020-05-26 | Siemens Aktiengesellschaft | Arrangement with at least two bus subscribers |
| CN106711934A (en) * | 2017-02-09 | 2017-05-24 | 昆山龙腾光电有限公司 | Power protection circuit and control method thereof |
| CN110445092A (en) * | 2019-09-09 | 2019-11-12 | 中国电子科技集团公司第四十三研究所 | It is a kind of under-voltage to open/turn off the switch circuit and switching threshold determines method |
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Application publication date: 20121114 |