CN202049191U - Overvoltage undervoltage detection circuit - Google Patents
Overvoltage undervoltage detection circuit Download PDFInfo
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- CN202049191U CN202049191U CN 201120131197 CN201120131197U CN202049191U CN 202049191 U CN202049191 U CN 202049191U CN 201120131197 CN201120131197 CN 201120131197 CN 201120131197 U CN201120131197 U CN 201120131197U CN 202049191 U CN202049191 U CN 202049191U
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Abstract
The utility model relates to an overvoltage undervoltage detection circuit which comprises an undervoltage determining unit, an overvoltage determining unit, a voltage sampling end, an output control end, a power supply end, a first voltage-dividing resistor, a second voltage-dividing resistor, a first current-limiting resistor, a first diode, a first switching pipe and a second switching pipe, wherein the undervoltage determining unit is used for ending when the voltage at the voltage sampling end is lower than the first threshold and outputting voltage to conduct the first switching pipe when the voltage is higher than the first threshold; the overvoltage determining unit is used for ending the voltage when the voltage sampling end is lower than the second threshold and outputting the voltage to conduct the second switching pipe when the voltage is higher than the second threshold. The overvoltage undervoltage detection circuit uses only one sampling point, thereby being simple, having high reliability and being easy to realize.
Description
[technical field]
The utility model relates to electric lighting field, relates in particular to a kind of over-and under-voltage testing circuit.
[background technology]
In the traditional circuit, overvoltage protection and under-voltage protection need two sampled points, and control respectively.The circuit complexity, the cost height.
[utility model content]
Based on this, be necessary to provide a kind of over-and under-voltage testing circuit that carries out the over-and under-voltage sampling by same sampled point.
A kind of over-and under-voltage testing circuit comprises under-voltage judging unit, overvoltage judging unit, voltage sample end, output control terminal, power end, first divider resistance, second divider resistance, first current-limiting resistance, first diode, first switching tube and second switch pipe; Described voltage sample end connects the input end of described under-voltage judging unit and the input end of overvoltage judging unit; Described first control end of switching tube connects the output terminal of described under-voltage judging unit, and the two ends in addition of described first switching tube are serially connected with between described power end and the ground wire; The output terminal of described overvoltage judging unit connects the control end of described second switch pipe, and be connected to described power end by first divider resistance, also be connected with ground wire by second divider resistance, the two ends in addition of described second switch pipe are serially connected with between described output control terminal and the ground wire; The positive pole of described first diode connects described voltage sample end, and the negative pole of described first diode connects described output control terminal, and described first current-limiting resistance is connected with described first diode; Described under-voltage judging unit is used for ending when the voltage of voltage sample end is lower than first threshold, and output makes the voltage of the first switching tube conducting when being higher than first threshold; Described overvoltage judging unit is used for ending when the voltage of voltage sample end is lower than second threshold value, and output makes the voltage of second switch pipe conducting when being higher than second threshold value.
Preferably, also be provided with the 3rd divider resistance between the input end of described under-voltage judging unit and the voltage sample end, described under-voltage judging unit comprises shunt resistance, the 4th divider resistance and first voltage stabilizing diode, be connected to described first voltage stabilizing diode and the 4th divider resistance between the input end of described under-voltage judging unit and the ground wire successively, the positive pole of described first voltage stabilizing diode is connected with the 4th divider resistance and the junction is the output terminal of described under-voltage judging unit, and the negative pole of described first voltage stabilizing diode is connected with the 3rd divider resistance and is connected with ground wire by shunt resistance.
Preferably, described overvoltage judging unit comprises the 5th divider resistance, the 6th divider resistance, second voltage stabilizing diode and second diode, be connected to the 5th divider resistance and the 6th divider resistance between the input end of described overvoltage judging unit and the ground wire successively, link to each other with the negative pole of described second voltage stabilizing diode between described the 5th divider resistance and the 6th divider resistance, the positive pole of described second voltage stabilizing diode connects the positive pole of described second diode, and the negative pole of described second diode is the output terminal of described overvoltage judging unit.
Preferably, described first switching tube and second switch pipe are NPN type triodes, and described control end is the base stage of NPN type triode, and the collector of described first switching tube is connected with described power end, and the emitter of described first switching tube is connected with ground wire; The collector of described second switch pipe is connected with described output control terminal, and the emitter of described second switch pipe is connected with described ground wire.
Preferably, also comprise bias resistance, second current-limiting resistance, the 3rd current-limiting resistance, the 4th current-limiting resistance, the 5th current-limiting resistance, the 3rd diode, the 4th diode, the 3rd switching tube, the 4th switching tube and the 5th switching tube, described the 3rd switching tube, the 4th switching tube and the 5th switching tube are NPN type triodes; The base stage of described the 3rd switching tube connects the anodal of described second voltage stabilizing diode and by described bias resistance ground connection, the collector of described the 3rd switching tube connects described power end by second current-limiting resistance, the grounded emitter of described the 3rd switching tube; The base stage of described the 4th switching tube connects the collector of described the 3rd switching tube, and the collector of described the 4th switching tube connects described power end by described the 3rd current-limiting resistance, the grounded emitter of described the 4th switching tube; The base stage of described the 5th switching tube connects described power end by described the 4th current-limiting resistance, and the collector of described the 5th switching tube connects described power end by described the 5th current-limiting resistance, the grounded emitter of described the 5th switching tube; The positive pole of described the 3rd diode connects the negative pole of described second diode, and the negative pole of described the 3rd diode connects the base stage of described second switch pipe; The positive pole of described the 4th diode is connected between the collector of described the 5th current-limiting resistance and the 5th switching tube, and the negative pole of described the 4th diode connects the negative pole of described the 3rd diode.
Preferably, also comprise first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity, described first an electric capacity and termination described output control terminal in parallel with described first current-limiting resistance, the negative pole of described first diode of another termination, the described power end of described second electric capacity, one termination, other end ground connection, the described voltage sample end of described the 3rd electric capacity one termination, other end ground connection, the positive pole of described first voltage stabilizing diode of described the 4th electric capacity one termination, other end ground connection, the described second voltage stabilizing diode positive pole of described the 5th electric capacity one termination, other end ground connection.
Above-mentioned over-and under-voltage testing circuit has only a sampled point, and circuit is simple, reliability is high, be easy to realization.
[description of drawings]
Fig. 1 is the circuit diagram of over-and under-voltage testing circuit among the embodiment;
Fig. 2 is the circuit theory diagrams of over-and under-voltage testing circuit among the embodiment;
Fig. 3 is the circuit theory diagrams of over-and under-voltage testing circuit among another embodiment.
[embodiment]
For the purpose of this utility model, feature and advantage can more be become apparent, embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
Fig. 1 is the circuit block diagram of temperature observation circuit among the embodiment, comprises voltage sample end 10, output control terminal 20, power end 30, under-voltage judging unit 40, overvoltage judging unit 50, the first divider resistance R18, the second divider resistance R19, the first current-limiting resistance R1, the first diode D5, the first switching tube Q4 and second switch pipe Q5.
Negative pole connection output control terminal 20, the first current-limiting resistance R1 that the positive pole of the first diode D5 connects voltage sample end 10, the first diode D5 connect with the first diode D5.
In the present embodiment, the first switching tube Q4 and second switch pipe Q5 are NPN type triodes, and control end is the base stage of NPN type triode, and the collector of the first switching tube Q4 is connected 20, the first switching tube Q4 with power end emitter is connected with ground wire.The collector of second switch pipe Q5 is connected with output control terminal 20, and the emitter of second switch pipe is connected with ground wire.
Under-voltage judging unit 40 is used for voltage at voltage sample end 10 and is lower than first threshold (being 8 volts in the present embodiment) time and ends, and output makes the voltage of the first switching tube Q4 conducting when being higher than first threshold.Overvoltage judging unit 50 is used for voltage at voltage sample end 10 and is lower than second threshold value (being 270 volts in the present embodiment) time and ends, and output makes the voltage of second switch pipe Q5 conducting when being higher than second threshold value.
Above-mentioned over-and under-voltage testing circuit 100 can be applied in the lamp driving circuit; when the voltage of voltage sample end 10 samplings is lower than first threshold or is higher than second threshold value; output control terminal 20 is an electronegative potential, and the holding circuit of control next stage is started working, and circuit is protected.Over-and under-voltage testing circuit 100 has only a sampled point, and circuit is simple, reliability is high, easy realization.
Fig. 2 is the circuit theory diagrams of over-and under-voltage testing circuit among the embodiment, in the present embodiment, also is provided with the 3rd divider resistance R11 between the input end of under-voltage judging unit 40 (not indicating among Fig. 2) and the voltage sample end 10.Under-voltage judging unit 40 comprises shunt resistance R8, the 4th divider resistance R12 and the first voltage stabilizing diode D3.Be connected to the first voltage stabilizing diode D3 and the 4th divider resistance R12 between the input end of under-voltage judging unit 40 and the ground wire successively.The positive pole of the first voltage stabilizing diode D3 is connected with the 4th divider resistance R12 and the junction is the output terminal of under-voltage judging unit 40, and the negative pole of the first voltage stabilizing diode D3 is connected with the 3rd divider resistance R11 and is connected with ground wire by shunt resistance R8.
Resistance by suitable design five divider resistance R9, five divider resistance R10, the 3rd divider resistance R11, the 4th divider resistance R12, when the voltage that the voltage stabilizing diode D3 that wins is sampled at voltage sample end 10 is lower than under-voltage protection point (being first threshold, is 8 volts in the present embodiment) by, conducting when being higher than under-voltage protection point; And when the voltage that the second voltage stabilizing diode D4 samples at voltage sample end 10 is lower than over-voltage protection point (promptly second threshold value is 270 volts in the present embodiment) by, conducting when being higher than over-voltage protection point.Output control terminal 20 is to be noble potential in 8～270 volt range at the voltage of voltage sample end 10 samplings like this, and holding circuit is not worked; And when under-voltage or overvoltage, output control terminal 20 is an electronegative potential, and the indication holding circuit is protected circuit.Therefore over-and under-voltage testing circuit 100 is by the conducting of two voltage stabilizing diodes with by realizing overvoltage and under-voltage protection, and circuit is simple, reliability is high, be easy to realization.
Fig. 3 is the circuit theory diagrams of another embodiment over-and under-voltage testing circuit, in the present embodiment, over-and under-voltage testing circuit 100 also comprises bias resistance R14, the second current-limiting resistance R2, the 3rd current-limiting resistance R3, the 4th current-limiting resistance R4, the 5th current-limiting resistance R5, the 3rd diode D2, the 4th diode D6, the 3rd switching tube Q1, the 4th switching tube Q2 and the 5th switching tube Q3.The 3rd switching tube Q1, the 4th switching tube Q2 and the 5th switching tube Q3 are NPN type triodes, and effect is gauge tap.
The base stage of the 3rd switching tube Q1 connects the anodal of the second voltage stabilizing diode D4 and passes through bias resistance R14 ground connection.The collector of the 3rd switching tube Q1 connects the grounded emitter of power end 30, the three switching tube Q1 by the second current-limiting resistance R2.
The base stage of the 4th switching tube Q2 connects the collector of the 3rd switching tube Q1, and the collector of the 4th switching tube Q2 connects the grounded emitter of power end 30, the four switching tube Q2 by the 3rd current-limiting resistance R3.In the present embodiment, the base stage of the 4th switching tube Q2 is the collector that connects the 3rd switching tube Q1 by current-limiting resistance R16.
The base stage of the 5th switching tube Q3 connects the grounded emitter of the collector of power end 30, the five switching tube Q3 by the 5th current-limiting resistance R5 connection power end 30, the five switching tube Q3 by the 4th current-limiting resistance R4.
The positive pole of the 3rd diode D2 connects the negative pole of the second diode D1, and the negative pole of the 3rd diode D2 connects the base stage of second switch pipe Q5.The positive pole of the 4th diode D6 is connected between the collector of the 5th current-limiting resistance R5 and the 5th switching tube Q3, and the negative pole of the 4th diode D6 connects the negative pole of the 3rd diode D2.
In the present embodiment, over-and under-voltage testing circuit 100 also comprises first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4 and the 5th capacitor C 5 for the filtering clutter.The negative pole of first capacitor C 1 and first capacitor C 1 one termination output control terminals 20 in parallel, another termination first diode D5 with the first current-limiting resistance R1.Second capacitor C, 2 one termination power ends 30, other end ground connection.The 3rd capacitor C 3 one termination voltage sampling ends 10, other end ground connection.Positive pole, the other end ground connection of the 4th capacitor C 4 one terminations first voltage stabilizing diode D3.The 5th capacitor C 5 one terminations second voltage stabilizing diode D4 positive pole, other end ground connection.
The above embodiment has only expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (6)
1. over-and under-voltage testing circuit, it is characterized in that, comprise under-voltage judging unit, overvoltage judging unit, voltage sample end, output control terminal, power end, first divider resistance, second divider resistance, first current-limiting resistance, first diode, first switching tube and second switch pipe;
Described voltage sample end connects the input end of described under-voltage judging unit and the input end of overvoltage judging unit;
Described first control end of switching tube connects the output terminal of described under-voltage judging unit, and the two ends in addition of described first switching tube are serially connected with between described power end and the ground wire;
The output terminal of described overvoltage judging unit connects the control end of described second switch pipe, and be connected to described power end by first divider resistance, also be connected with ground wire by second divider resistance, the two ends in addition of described second switch pipe are serially connected with between described output control terminal and the ground wire;
The positive pole of described first diode connects described voltage sample end, and the negative pole of described first diode connects described output control terminal, and described first current-limiting resistance is connected with described first diode;
Described under-voltage judging unit is used for ending when the voltage of voltage sample end is lower than first threshold, and output makes the voltage of the first switching tube conducting when being higher than first threshold; Described overvoltage judging unit is used for ending when the voltage of voltage sample end is lower than second threshold value, and output makes the voltage of second switch pipe conducting when being higher than second threshold value.
2. over-and under-voltage testing circuit according to claim 1, it is characterized in that, also be provided with the 3rd divider resistance between the input end of described under-voltage judging unit and the voltage sample end, described under-voltage judging unit comprises shunt resistance, the 4th divider resistance and first voltage stabilizing diode, be connected to described first voltage stabilizing diode and the 4th divider resistance between the input end of described under-voltage judging unit and the ground wire successively, the positive pole of described first voltage stabilizing diode is connected with the 4th divider resistance and the junction is the output terminal of described under-voltage judging unit, and the negative pole of described first voltage stabilizing diode is connected with the 3rd divider resistance and is connected with ground wire by shunt resistance.
3. over-and under-voltage testing circuit according to claim 2, it is characterized in that, described overvoltage judging unit comprises the 5th divider resistance, the 6th divider resistance, second voltage stabilizing diode and second diode, be connected to the 5th divider resistance and the 6th divider resistance between the input end of described overvoltage judging unit and the ground wire successively, link to each other with the negative pole of described second voltage stabilizing diode between described the 5th divider resistance and the 6th divider resistance, the positive pole of described second voltage stabilizing diode connects the positive pole of described second diode, and the negative pole of described second diode is the output terminal of described overvoltage judging unit.
4. over-and under-voltage testing circuit according to claim 3, it is characterized in that, described first switching tube and second switch pipe are NPN type triodes, described control end is the base stage of NPN type triode, the collector of described first switching tube is connected with described power end, and the emitter of described first switching tube is connected with ground wire; The collector of described second switch pipe is connected with described output control terminal, and the emitter of described second switch pipe is connected with described ground wire.
5. over-and under-voltage testing circuit according to claim 4, it is characterized in that, also comprise bias resistance, second current-limiting resistance, the 3rd current-limiting resistance, the 4th current-limiting resistance, the 5th current-limiting resistance, the 3rd diode, the 4th diode, the 3rd switching tube, the 4th switching tube and the 5th switching tube, described the 3rd switching tube, the 4th switching tube and the 5th switching tube are NPN type triodes;
The base stage of described the 3rd switching tube connects the anodal of described second voltage stabilizing diode and by described bias resistance ground connection, the collector of described the 3rd switching tube connects described power end by second current-limiting resistance, the grounded emitter of described the 3rd switching tube;
The base stage of described the 4th switching tube connects the collector of described the 3rd switching tube, and the collector of described the 4th switching tube connects described power end by described the 3rd current-limiting resistance, the grounded emitter of described the 4th switching tube;
The base stage of described the 5th switching tube connects described power end by described the 4th current-limiting resistance, and the collector of described the 5th switching tube connects described power end by described the 5th current-limiting resistance, the grounded emitter of described the 5th switching tube;
The positive pole of described the 3rd diode connects the negative pole of described second diode, and the negative pole of described the 3rd diode connects the base stage of described second switch pipe; The positive pole of described the 4th diode is connected between the collector of described the 5th current-limiting resistance and the 5th switching tube, and the negative pole of described the 4th diode connects the negative pole of described the 3rd diode.
6. according to any described over-and under-voltage testing circuit in the claim 3 to 5, it is characterized in that, also comprise first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity, described first an electric capacity and termination described output control terminal in parallel with described first current-limiting resistance, the negative pole of described first diode of another termination, the described power end of described second electric capacity, one termination, other end ground connection, the described voltage sample end of described the 3rd electric capacity one termination, other end ground connection, the positive pole of described first voltage stabilizing diode of described the 4th electric capacity one termination, other end ground connection, the described second voltage stabilizing diode positive pole of described the 5th electric capacity one termination, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120131197 CN202049191U (en) | 2011-04-28 | 2011-04-28 | Overvoltage undervoltage detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120131197 CN202049191U (en) | 2011-04-28 | 2011-04-28 | Overvoltage undervoltage detection circuit |
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| CN202049191U true CN202049191U (en) | 2011-11-23 |
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| CN 201120131197 Expired - Fee Related CN202049191U (en) | 2011-04-28 | 2011-04-28 | Overvoltage undervoltage detection circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323645A (en) * | 2013-05-27 | 2013-09-25 | 无锡中星微电子有限公司 | Voltage detecting circuit of multiple cell units in series and battery protecting system |
| CN103389406A (en) * | 2012-05-11 | 2013-11-13 | 海洋王（东莞）照明科技有限公司 | Voltage indicating circuit and lamp |
| CN103683184A (en) * | 2012-08-31 | 2014-03-26 | 西门子公司 | Undervoltage-overvoltage protection device and method |
| 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 |
| CN106443146A (en) * | 2016-09-12 | 2017-02-22 | 浙江中控技术股份有限公司 | Master-slave system fault detection and processing system |
| CN106535422A (en) * | 2017-01-01 | 2017-03-22 | 杭州鸿雁电器有限公司 | Light source abnormity alarm circuit for LED lamp |
| CN106786374A (en) * | 2017-02-21 | 2017-05-31 | 广东欧珀移动通信有限公司 | Power circuit, linear power supply and audio frequency apparatus |
| CN111071046A (en) * | 2019-11-18 | 2020-04-28 | 深圳市元征科技股份有限公司 | High-low voltage detection circuit |
-
2011
- 2011-04-28 CN CN 201120131197 patent/CN202049191U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389406A (en) * | 2012-05-11 | 2013-11-13 | 海洋王（东莞）照明科技有限公司 | Voltage indicating circuit and lamp |
| CN103389406B (en) * | 2012-05-11 | 2016-11-02 | 海洋王（东莞）照明科技有限公司 | Voltage indicating circuit and light fixture |
| CN103683184A (en) * | 2012-08-31 | 2014-03-26 | 西门子公司 | Undervoltage-overvoltage protection device and method |
| CN103683184B (en) * | 2012-08-31 | 2016-12-21 | 西门子公司 | Undervoltage-overvolprotection protection device and method |
| CN103323645A (en) * | 2013-05-27 | 2013-09-25 | 无锡中星微电子有限公司 | Voltage detecting circuit of multiple cell units in series and battery protecting system |
| CN103323645B (en) * | 2013-05-27 | 2016-03-16 | 无锡中感微电子股份有限公司 | The voltage detecting circuit of multiple battery core units in series and battery protection system |
| 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 |
| CN106443146A (en) * | 2016-09-12 | 2017-02-22 | 浙江中控技术股份有限公司 | Master-slave system fault detection and processing system |
| CN106535422A (en) * | 2017-01-01 | 2017-03-22 | 杭州鸿雁电器有限公司 | Light source abnormity alarm circuit for LED lamp |
| CN106786374A (en) * | 2017-02-21 | 2017-05-31 | 广东欧珀移动通信有限公司 | Power circuit, linear power supply and audio frequency apparatus |
| CN111071046A (en) * | 2019-11-18 | 2020-04-28 | 深圳市元征科技股份有限公司 | High-low voltage detection circuit |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111123 Termination date: 20190428 |