CN104076192A - Lamp drive under voltage alarm circuit - Google Patents
Lamp drive under voltage alarm circuit Download PDFInfo
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- CN104076192A CN104076192A CN201310101252.9A CN201310101252A CN104076192A CN 104076192 A CN104076192 A CN 104076192A CN 201310101252 A CN201310101252 A CN 201310101252A CN 104076192 A CN104076192 A CN 104076192A
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Abstract
A lamp drive under voltage alarm circuit is used for giving an alarm signal in the case of under voltage of lamp drive power supply voltage. The circuit comprises a voltage conversion module used for converting input voltage into rated voltage, a voltage comparison module, a switch module and an alarm module, wherein the input end of the voltage conversion module inputs power supply voltage; the output end of the voltage conversion module is electrically connected with the input end of the alarm module; the positive phase input end of the voltage comparison module inputs reference voltage, the negative phase input end of the voltage comparison module inputs power supply voltage, and the output end of the voltage comparison module is electrically connected with the control end of the switch module; the input end of the switch module is electrically connected with the output end of the alarm module, and the output end of the switch module is grounded. When the power supply voltage is lower than the reference voltage, the voltage comparison module outputs high level, the switch module receives the high level to be conducted, the alarm module forms a communication loop via the switch module, the alarm module gives an alarm signal to remind the user that the power supply voltage at the moment is in the under voltage state.
Description
Technical field
The present invention relates to undervoltage warning circuit, particularly relate to a kind of simple light fixture and drive undervoltage warning circuit.
Background technology
Under-voltage referring to due to reasons such as short troubles, can there is significantly reducing the phenomenon even disappearing in line voltage distribution at short notice.It can bring damage to circuit and electric equipment.For example: make that motor tiredly falls, stall, thereby produce the excess current that is several times as much as rated current, burn out motor; When voltage recovers, the self-starting of a large amount of motor can make again the voltage of motor significantly decline, and works the mischief.
Same, thereby when supply voltage is under-voltage, can cause source current to increase the driving that damages power supply.Thereby most of circuit is because under-voltage location is inaccurate, does not have warning of hommization, makes people in use very inconvenient.
Summary of the invention
Based on this, provide a kind of simple light fixture to drive undervoltage warning circuit.
Light fixture drives a undervoltage warning circuit, for send alerting signal when light fixture driving supply voltage is under-voltage, comprises for input voltage being converted to voltage transformation module, voltage comparison module, switch module and the alarm module of rated voltage;
The input end input supply voltage of described voltage transformation module, the output terminal of described voltage transformation module is electrically connected to the input end of described alarm module;
The normal phase input end input reference voltage of described voltage comparison module, the inverting input input supply voltage of described voltage comparison module, the output terminal of described voltage comparison module is electrically connected to the control end of described switch module;
The input end of described switch module is electrically connected to the output terminal of described alarm module, the output head grounding of described switch module;
Wherein, supply voltage is during lower than described reference voltage, described voltage comparison module output high level, and described switch module receives described high level conducting, and described alarm module forms connected loop by described switch module, and described alarm module sends alerting signal.
In an embodiment, described voltage transformation module comprises voltage transitions chip LM7812 therein, the input termination supply voltage of described voltage transitions chip LM7812, and the output terminal of described voltage transitions chip LM7812 is electrically connected to described alarm module.
In an embodiment, described voltage comparison module comprises divider resistance R6, divider resistance R7, feedback resistance R4 and operational amplifier U2 therein;
Described divider resistance R6 and described divider resistance R7 are series between supply voltage and earth terminal, the points of common connection of described divider resistance R6 and described divider resistance R7 is electrically connected to the inverting input of described operational amplifier U2, the normal phase input end input reference voltage of described operational amplifier U2, the output terminal of described operational amplifier U2 is electrically connected to the control end of described switch module; Described feedback resistance R4 one end is electrically connected to the normal phase input end of described operational amplifier U2, and the other end is electrically connected to the output terminal of described operational amplifier U2.
Therein in an embodiment, also comprise the reference voltage module being electrically connected to described voltage transformation module and described voltage comparison module, described reference voltage module is exported to described voltage comparison module for converting the rated voltage of voltage transformation module output to reference voltage.
In an embodiment, described reference voltage module comprises current-limiting resistance R1, divider resistance R2, divider resistance R3 and voltage stabilizing diode D1 therein;
Described current-limiting resistance R1, described divider resistance R2 and described divider resistance R3 are series between the output terminal and earth terminal of described voltage transformation module; Described current-limiting resistance R1 is connected with the negative electricity of described voltage stabilizing diode D1 with the points of common connection of described divider resistance R2, the plus earth of described voltage stabilizing diode D1; The points of common connection output reference voltage of described divider resistance R2 and described divider resistance R3.
Therein in an embodiment, described switch module comprises current-limiting resistance R10 and triode Q1, one end of described current-limiting resistance R10 is electrically connected to the output terminal of described voltage comparison module, the other end is electrically connected to the base stage of described triode Q1, the collector of described triode Q1 is electrically connected to the output terminal of described alarm module, the grounded emitter of described triode Q1.
In an embodiment, described alarm module comprises hummer T1 therein, and the positive pole of described hummer T1 is electrically connected to the output terminal of described voltage transformation module, and the negative pole of described hummer T1 is electrically connected to the input end of described switch module.
In an embodiment, also comprise the load protection module being electrically connected to described voltage transformation module and described switch module therein, described load protection module stops load supplying for control supply voltage when described switch module conducting.
Therein in an embodiment; described load protection module comprises relay K 1; the electronic coil of described relay K 1 is series between the output terminal of described voltage transformation module and the input end of described switch module, the normally closed switch one termination supply voltage of described relay K 1, another termination load.
Above-mentioned light fixture drives undervoltage warning circuit by voltage comparison module, to compare the size of supply voltage and reference voltage, and at supply voltage during lower than reference voltage, voltage comparison module output high level, thereby gauge tap module conducting, thereby alarm module forms the loop of connection by the switch module of conducting, alarm module sends alerting signal, prompting user now supply voltage in under-voltage condition.
Accompanying drawing explanation
Fig. 1 is the module map that light fixture drives undervoltage warning circuit;
Fig. 2 is the schematic diagram that light fixture drives undervoltage warning circuit.
Embodiment
As shown in Figure 1, for light fixture, drive the module map of undervoltage warning circuit.
A kind of light fixture drives undervoltage warning circuit, for send alerting signal when light fixture driving supply voltage is under-voltage, comprise voltage transformation module 101, voltage comparison module 103, switch module 105 and alarm module 107 for input voltage being converted to rated voltage.
The input end input supply voltage of described voltage transformation module 101, the output terminal of described voltage transformation module 101 is electrically connected to the input end of described alarm module 107.
The normal phase input end input reference voltage of described voltage comparison module 103, the inverting input input supply voltage of described voltage comparison module 103, the output terminal of described voltage comparison module 103 is electrically connected to the control end of described switch module 105.
The input end of described switch module 105 is electrically connected to the output terminal of described alarm module 107, the output head grounding of described switch module 105.
Wherein, supply voltage is during lower than described reference voltage, described voltage comparison module 103 output high level, and described switch module 105 receives described high level conducting, described alarm module 107 forms connected loop by described switch module 105, and described alarm module 107 sends alerting signal.
Voltage transformation module 101 is for converting supply voltage to rated voltage and exporting to alarm module 107.Simultaneously for the reference voltage of voltage comparison module 103 inputs is prepared.The pressure drop required due to alarm module 107 and load varies in size, and therefore, between supply voltage and alarm module 107, increases voltage transformation module 101.
Voltage comparison module 103 is for the size of benchmark voltage and supply voltage, and exports corresponding voltage signal according to comparative result.Particularly, when reference voltage is greater than supply voltage, when supply voltage is under-voltage, voltage comparison module 103 output high level.When reference voltage is less than supply voltage, when supply voltage is normally worked, voltage comparison module 103 output low levels.
Switch module 105 is for control self conducting and cut-off according to the output level of voltage comparison module 103, and then whether decision alarm module 107 forms connected loop.Corresponding, conducting when switch module 105 receives high level, thereby alarm module 107 forms connected loop via switch module 105.Switch module 105 ends while receiving low level, and alarm module 107 cannot form connected loop.
Alarm module 107 is when forming connected loop, and alarm module 107 sends alerting signal, prompting user now supply voltage in under-voltage condition.
Incorporated by reference to Fig. 2.
Voltage transformation module 101 comprises voltage transitions chip LM7812, the input termination supply voltage of described voltage transitions chip LM7812, and the output terminal of described voltage transitions chip LM7812 is electrically connected to described alarm module 107.
Voltage comparison module 103 comprises divider resistance R6, divider resistance R7, feedback resistance R4 and operational amplifier U2;
Described divider resistance R6 and described divider resistance R7 are series between supply voltage and earth terminal, the points of common connection of described divider resistance R6 and described divider resistance R7 is electrically connected to the inverting input of described operational amplifier U2, the normal phase input end input reference voltage of described operational amplifier U2, the output terminal of described operational amplifier U2 is electrically connected to the control end of described switch module 105; Described feedback resistance R4 one end is electrically connected to the normal phase input end of described operational amplifier U2, and the other end is electrically connected to the output terminal of described operational amplifier U2.
Light fixture drives undervoltage warning circuit also to comprise the reference voltage module 109 being electrically connected to described voltage transformation module 101 and described voltage comparison module 103, and described reference voltage module 109 is exported to described voltage comparison module 103 for converting the rated voltage of voltage transformation module 101 outputs to reference voltage.
Reference voltage module 109 comprises current-limiting resistance R1, divider resistance R2, divider resistance R3 and voltage stabilizing diode D1;
Described current-limiting resistance R1, described divider resistance R2 and described divider resistance R3 are series between the output terminal and earth terminal of described voltage transformation module 101; Described current-limiting resistance R1 is connected with the negative electricity of described voltage stabilizing diode D1 with the points of common connection of described divider resistance R2, the plus earth of described voltage stabilizing diode D1; The points of common connection output reference voltage of described divider resistance R2 and described divider resistance R3.
Switch module 105 comprises current-limiting resistance R10 and triode Q1, one end of described current-limiting resistance R10 is electrically connected to the output terminal of described voltage comparison module 103, the other end is electrically connected to the base stage of described triode Q1, the collector of described triode Q1 is electrically connected to the output terminal of described alarm module 107, the grounded emitter of described triode Q1.
Alarm module 107 comprises hummer T1, and the positive pole of described hummer T1 is electrically connected to the output terminal of described voltage transformation module 101, and the negative pole of described hummer T1 is electrically connected to the input end of described switch module 105.
Light fixture drives undervoltage warning circuit also to comprise the load protection module 111 being electrically connected to described voltage transformation module 101 and described switch module 105, and described load protection module 111 stops load supplying for controlling supply voltage when described switch module 105 conducting.
Load protection module 111 comprises relay K 1; the electronic coil of described relay K 1 is series between the output terminal of described voltage transformation module 101 and the input end of described switch module 105; the normally closed switch one termination supply voltage of described relay K 1, another termination load.
Based on above-mentioned all embodiment, light fixture drives the principle of work of undervoltage warning circuit as follows:
Supply voltage is exported to voltage transitions chip LM7812, voltage comparison module 103 and load.Voltage transitions chip LM7812 is converted to supply voltage the DC voltage of 12V size, and exports to reference voltage module 109 and alarm module 107.The DC voltage of 12V via current-limiting resistance R1, divider resistance R2 and divider resistance R3 after, at the points of common connection output reference voltage of divider resistance R2 and divider resistance R3 to voltage comparison module 103.Supply voltage is via after divider resistance R6 and divider resistance R7, and the points of common connection of divider resistance R6 and divider resistance R7 is connected with the inverting input of operational amplifier U2.Between the normal phase input end of operational amplifier U2 and output terminal, be connected to feedback resistance R4.
Operational amplifier U2 is according to the voltage swing output low and high level of normal phase input end and inverting input.Corresponding, at the voltage of normal phase input end, during higher than the voltage of inverting input, when reference voltage is higher than supply voltage, operational amplifier U2 exports high level.At the voltage of normal phase input end during lower than the voltage of inverting input, when reference voltage is lower than supply voltage, operational amplifier U2 output low level.The output signal of operational amplifier U2 is exported to triode Q1 via current-limiting resistance R10.Triode Q1 is NPN type triode, and therefore, conducting when triode Q1 receives high level, in reference voltage conducting during higher than supply voltage.During triode Q1 conducting, hummer T1 forms connected loop by triode Q1, and hummer T1 starts working, and hummer is sounded a buzzer, and points out now supply voltage in under-voltage condition.Simultaneously, the electronic coil that is connected to the relay K 1 between supply voltage and triode Q1 collector obtains electric, and therefore, the normally closed switch of relay K 1 disconnects, supply voltage stops load supplying, avoids causing because supply voltage is under-voltage that source current is excessive that load is caused to damage.
And triode Q1 ends while receiving low level, therefore, hummer T1 and relay K 1 all can not form connected loop, and supply voltage is normally to load supplying.
Above-mentioned light fixture drives undervoltage warning circuit by voltage comparison module 103, to compare the size of supply voltage and reference voltage, and at supply voltage during lower than reference voltage, voltage comparison module 103 output high level, thereby gauge tap module 105 conductings, thereby alarm module 107 forms the loop of connection by the switch module 105 of conducting, alarm module 107 sends alerting signal, prompting user now supply voltage in under-voltage condition.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (9)
1. a light fixture drives undervoltage warning circuit, for send alerting signal when light fixture driving supply voltage is under-voltage, it is characterized in that, comprise for input voltage being converted to voltage transformation module, voltage comparison module, switch module and the alarm module of rated voltage;
The input end input supply voltage of described voltage transformation module, the output terminal of described voltage transformation module is electrically connected to the input end of described alarm module;
The normal phase input end input reference voltage of described voltage comparison module, the inverting input input supply voltage of described voltage comparison module, the output terminal of described voltage comparison module is electrically connected to the control end of described switch module;
The input end of described switch module is electrically connected to the output terminal of described alarm module, the output head grounding of described switch module;
Wherein, supply voltage is during lower than described reference voltage, described voltage comparison module output high level, and described switch module receives described high level conducting, and described alarm module forms connected loop by described switch module, and described alarm module sends alerting signal.
2. light fixture according to claim 1 drives undervoltage warning circuit, it is characterized in that, described voltage transformation module comprises voltage transitions chip LM7812, the input termination supply voltage of described voltage transitions chip LM7812, the output terminal of described voltage transitions chip LM7812 is electrically connected to described alarm module.
3. light fixture according to claim 1 drives undervoltage warning circuit, it is characterized in that, described voltage comparison module comprises divider resistance R6, divider resistance R7, feedback resistance R4 and operational amplifier U2;
Described divider resistance R6 and described divider resistance R7 are series between supply voltage and earth terminal, the points of common connection of described divider resistance R6 and described divider resistance R7 is electrically connected to the inverting input of described operational amplifier U2, the normal phase input end input reference voltage of described operational amplifier U2, the output terminal of described operational amplifier U2 is electrically connected to the control end of described switch module; Described feedback resistance R4 one end is electrically connected to the normal phase input end of described operational amplifier U2, and the other end is electrically connected to the output terminal of described operational amplifier U2.
4. light fixture according to claim 1 drives undervoltage warning circuit, it is characterized in that, also comprise the reference voltage module being electrically connected to described voltage transformation module and described voltage comparison module, described reference voltage module is exported to described voltage comparison module for converting the rated voltage of voltage transformation module output to reference voltage.
5. light fixture according to claim 4 drives undervoltage warning circuit, it is characterized in that, described reference voltage module comprises current-limiting resistance R1, divider resistance R2, divider resistance R3 and voltage stabilizing diode D1;
Described current-limiting resistance R1, described divider resistance R2 and described divider resistance R3 are series between the output terminal and earth terminal of described voltage transformation module; Described current-limiting resistance R1 is connected with the negative electricity of described voltage stabilizing diode D1 with the points of common connection of described divider resistance R2, the plus earth of described voltage stabilizing diode D1; The points of common connection output reference voltage of described divider resistance R2 and described divider resistance R3.
6. light fixture according to claim 1 drives undervoltage warning circuit, it is characterized in that, described switch module comprises current-limiting resistance R10 and triode Q1, one end of described current-limiting resistance R10 is electrically connected to the output terminal of described voltage comparison module, the other end is electrically connected to the base stage of described triode Q1, the collector of described triode Q1 is electrically connected to the output terminal of described alarm module, the grounded emitter of described triode Q1.
7. light fixture according to claim 1 drives undervoltage warning circuit, it is characterized in that, described alarm module comprises hummer T1, and the positive pole of described hummer T1 is electrically connected to the output terminal of described voltage transformation module, and the negative pole of described hummer T1 is electrically connected to the input end of described switch module.
8. light fixture according to claim 1 drives undervoltage warning circuit; it is characterized in that; also comprise the load protection module being electrically connected to described voltage transformation module and described switch module, described load protection module stops load supplying for control supply voltage when described switch module conducting.
9. light fixture according to claim 8 drives undervoltage warning circuit; it is characterized in that; described load protection module comprises relay K 1; the electronic coil of described relay K 1 is series between the output terminal of described voltage transformation module and the input end of described switch module; the normally closed switch one termination supply voltage of described relay K 1, another termination load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310101252.9A CN104076192A (en) | 2013-03-26 | 2013-03-26 | Lamp drive under voltage alarm circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310101252.9A CN104076192A (en) | 2013-03-26 | 2013-03-26 | Lamp drive under voltage alarm circuit |
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| CN104076192A true CN104076192A (en) | 2014-10-01 |
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| CN201310101252.9A Pending CN104076192A (en) | 2013-03-26 | 2013-03-26 | Lamp drive under voltage alarm circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078927A (en) * | 2013-03-26 | 2014-10-01 | 海洋王（东莞）照明科技有限公司 | Lamp driving undervoltage alarm circuit |
| CN106080202A (en) * | 2016-08-15 | 2016-11-09 | 成都云科新能汽车技术有限公司 | A kind of electric power system for car-mounted terminal |
| CN109444647A (en) * | 2018-12-25 | 2019-03-08 | 镇江中煤电子有限公司 | Mining guiding feed sensor |
| CN113777393A (en) * | 2021-09-23 | 2021-12-10 | 华东光电集成器件研究所 | RS485 interface communication under-amplitude detection circuit |
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| JPS63286777A (en) * | 1987-05-19 | 1988-11-24 | Nec Corp | Power source abnormality detecting circuit |
| JPH0735786A (en) * | 1993-07-20 | 1995-02-07 | Toshiba Corp | Voltage reduction detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078927A (en) * | 2013-03-26 | 2014-10-01 | 海洋王（东莞）照明科技有限公司 | Lamp driving undervoltage alarm circuit |
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| CN109444647A (en) * | 2018-12-25 | 2019-03-08 | 镇江中煤电子有限公司 | Mining guiding feed sensor |
| CN113777393A (en) * | 2021-09-23 | 2021-12-10 | 华东光电集成器件研究所 | RS485 interface communication under-amplitude detection circuit |
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Application publication date: 20141001 |