CN103813564A - Lamp and protection circuit thereof - Google Patents
Lamp and protection circuit thereof Download PDFInfo
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- CN103813564A CN103813564A CN201210437167.5A CN201210437167A CN103813564A CN 103813564 A CN103813564 A CN 103813564A CN 201210437167 A CN201210437167 A CN 201210437167A CN 103813564 A CN103813564 A CN 103813564A
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Abstract
The invention provides an overheating protection circuit used in overheating protection of a lamp. The overheating protection circuit comprises a voltage converting unit used for converting external AC voltage into DC voltage, a sensing voltage-dividing unit for sensing temperature in the lamp in order to divide the DC voltage and outputting a divided voltage, an electric switch for receiving the divided voltage, a relay connected with and controlled by the electric switch, and a cooling element connected with the voltage converting unit via the relay. When the temperature of the lamp is more than a preset temperature, the divided voltage outputted by the sensing voltage-dividing unit controls the electric switch to be in a cut-off state so as to close the relay. The voltage converting unit is connected with the cooling element in order to provide DC voltage for the cooling element to cool the lamp. The overheating protection circuit achieves overheating protection of the lamp. The invention also provides a lamp using the overheating protection circuit.
Description
Technical field
The present invention relates to lighting field, relate in particular to a kind of light fixture and overheating protection circuit thereof.
Background technology
Conventionally, traditional light fixture is in the time throwing light on relatively for a long time, and the temperature in the housing of described light fixture can increase.In the time that the temperature in the housing of described light fixture is increased to a certain temperature, the element device in described light fixture there will be abnormal and cannot normally work at this temperature, when serious described in components and parts in the housing of light fixture can be burnt, thereby damage described light fixture.
Summary of the invention
The object of the present invention is to provide a kind of light fixture and overheating protection circuit thereof, so that described light fixture is carried out to overtemperature protection.
In order to solve the problems of the technologies described above, the invention provides a kind of overheating protection circuit, be applied to light fixture so that described light fixture is carried out to overtemperature protection, described overheating protection circuit comprises:
Voltage conversion unit, is connected to external AC power supply, so that the alternating voltage of external AC power supply output is converted to direct voltage;
Sensing partial pressure unit, is connected to described voltage conversion unit, to receive described direct voltage; Described sensing partial pressure unit is carried out dividing potential drop by the temperature in light fixture described in sensing to described direct voltage, to export branch pressure voltage;
Electric switch, is connected to described sensing partial pressure unit, to receive described branch pressure voltage, wherein, the break-make of electric switch described in the control of described sensing partial pressure unit;
Relay, is connected to described electric switch and described voltage conversion circuit, wherein, and the break-make of relay described in described electric switch control; And
Cooling element, is connected to described voltage conversion unit by described relay, wherein, and being connected between voltage conversion unit and described cooling element described in described Control;
In the time that the temperature of described light fixture is greater than preset temperature, electric switch cut-off described in the branch pressure voltage control of described sensing partial pressure unit output, thereby closed described relay, described voltage conversion unit is connected to described cooling element to provide described direct voltage that the work of described cooling element is lowered the temperature to described light fixture.
Wherein, described sensing partial pressure unit comprises thermistor and divider resistance, described thermistor and described divider resistance are connected between first output and the second output of described voltage conversion unit, the node of described thermistor and described divider resistance is connected to the control end of described electric switch, the first end of described electric switch is connected to the second output of described voltage conversion unit, and the second end of described the second electric switch is connected to the first output of described power conversion unit by the coil of described relay.
Wherein, described thermistor is along with the rising of the temperature of its sensing, the resistance value of himself increases, the first output of described voltage conversion unit is connected to the control end of described electric switch by described divider resistance, the control end of described electric switch is also connected to the second output of described voltage conversion unit by described thermistor.
Wherein, described thermistor is along with the rising of the temperature of its sensing, the resistance value of himself reduces, the first output of described voltage conversion unit is connected to the control end of described electric switch by described thermistor, the control end of described electric switch is also connected to the second output of described voltage conversion unit by described divider resistance.
Wherein, described electric switch is NPN type triode, and control end, first end and second end of described electric switch is respectively base stage, emitter and the collector electrode of described triode.
Wherein, described cooling element is cooling piece.
Wherein, described voltage conversion unit comprises transformer and rectifier, the primary coil of described transformer is connected to described extraneous AC power, the secondary coil of described transformer is connected to first input end and second input of described rectifier, and the first output of described rectifier and the second output are as the first output and second output of described voltage conversion unit.
Wherein, described voltage conversion unit also comprises electric capacity, and the positive pole of described electric capacity is connected to the first output of described rectifier, and the negative pole of described electric capacity is connected to the second output of described rectifier.
Wherein, described voltage conversion unit also comprises voltage stabilizing didoe, and the positive pole of described voltage stabilizing didoe is connected to the second output of described rectifier, and the negative pole of described voltage stabilizing didoe is connected to the first output of described rectifier.
The present invention also provides a kind of light fixture, and described light fixture comprises housing and is arranged at the above-mentioned overheating protection circuit in described housing, so that described light fixture is carried out to overtemperature protection.
A kind of overheating protection circuit of the present invention, for carrying out overtemperature protection to light fixture.Described overheating protection circuit comprises voltage conversion unit, sensing partial pressure unit, electric switch, relay and cooling element.In the time that the temperature of described light fixture is greater than preset temperature, electric switch cut-off described in the branch pressure voltage control of described sensing partial pressure unit output, thereby closed described relay, described voltage conversion unit is connected to described cooling element to provide described direct voltage that the work of described cooling element is lowered the temperature to described light fixture.The present invention has realized the overtemperature protection to described light fixture.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, to the accompanying drawing of required use in execution mode be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the block diagram of light fixture preferred embodiments of the present invention.
Fig. 2 is the circuit diagram of the first preferred embodiments of overheating protection circuit of the present invention;
Fig. 3 is the circuit diagram of the second preferred embodiments of overheating protection circuit of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in embodiment of the present invention, the technical scheme in embodiment of the present invention is clearly and completely described.
Refer to Fig. 1, the invention provides a kind of light fixture 100.Described light fixture 100 comprises housing 10 and is arranged at the overheating protection circuit 20 in described housing 10.
Described overheating protection circuit 20 comprises: voltage conversion unit 21, sensing partial pressure unit 22, electric switch 23, relay 24 and cooling element 25.
Described voltage conversion unit 21 is connected to external AC power supply 30, converts direct voltage to the alternating voltage that external AC power supply 30 is exported.
Described sensing partial pressure unit 22 is connected to described voltage conversion unit 21, to receive described direct voltage.Described sensing partial pressure unit 22 is carried out dividing potential drop by the temperature in housing described in sensing 10 to described direct voltage, to export branch pressure voltage.
Described electric switch 23 is connected to described sensing partial pressure unit 22, to receive described branch pressure voltage.Described sensing partial pressure unit 22 is controlled the break-make of described electric switch 23.
Described relay 24 is connected to described electric switch Q1 and described voltage conversion unit 21.Described electric switch Q1 controls the break-make of described relay 24.
Described cooling element 25 is connected to described voltage conversion unit 21 by described relay 24.Described relay 24 is controlled being connected between described voltage conversion unit 21 and described cooling element 25.
In the time that the temperature in described housing 10 is greater than a preset temperature, described sensing partial pressure unit 22 is exported the first branch pressure voltage to described electric switch 23, thus electric switch 23 described in conducting, and then closed described relay 24.Described voltage conversion unit 21 is connected to described cooling element 25 by described relay 24.Described voltage conversion unit 21 provides described direct voltage to described cooling element, so that the work of described cooling element lowers the temperature to the housing 10 of described light fixture 100, thereby has realized the overtemperature protection to described light fixture 100.
Refer to Fig. 2, described voltage conversion unit 21 comprises transformer T and rectifier DB.The primary coil of described transformer T is connected to described extraneous AC power 30.The secondary coil of described transformer T is connected to first input end and the second input of described rectifier DB.
Described power conversion unit 21 also comprises capacitor C 1.The positive pole of described capacitor C 1 is connected to the first output of described rectifier DB.The negative pole of described capacitor C 1 is connected to the second output of described rectifier DB.
Further, described power conversion unit 21 also comprises stabistor D1.The positive pole of described voltage stabilizing didoe D1 is connected to the second output of described rectifier DB.The negative pole of described voltage stabilizing didoe D1 is connected to the first output of described rectifier DB.
Described sensing partial pressure unit 22 comprises thermistor RT1 and divider resistance R1.Described thermistor RT1 and described divider resistance R1 are connected between first and second output of described rectifier DB.The node of described thermistor RT1 and described divider resistance R1 is connected to the control end of described electric switch 23.
Wherein, described thermistor RT1 is along with the rising of the temperature of its sensing, and the resistance value of himself increases.The first output of described rectifier DB is connected to the control end of described electric switch 23 by described divider resistance R1.The control end of described electric switch 23 is also connected to the second output of described rectifier DB by described thermistor RT1.The first end of described electric switch 23 is connected to the second output of described rectifier DB.The second end of described electric switch 23 connects the first output that is connected to described rectifier DB by the coil L of described relay 24.The first output of described rectifier DB is connected to the first power end of described cooling element 25 by the K switch of described relay 24.The second source end of described cooling element 25.Wherein, first and second output of described rectifier DB is respectively as first and second output of described voltage conversion unit 21.
In the present embodiment, described electric switch 23 is NPN type triode.Control end, first end and second end of described electric switch 23 is respectively base stage, emitter and the collector electrode of described triode.Described cooling element is cooling piece.The first power end of described cooling piece is cathode power supply end.The second source end of described cooling piece is negative electricity source.The first output of described rectifier DB is anodal.The second output of described rectifier DB is negative pole.
In other embodiments, described electric switch can be also other transistors, as N-type field effect transistor etc.Described cooling element 25 can be also other cooling module.
The specific works principle of described overheating protection circuit 20 is as follows:
In the time that the temperature in described housing 10 is greater than described preset temperature, the resistance value of described thermistor RT1 is greater than default resistance.Described in node output valve between described thermistor RT1 and described divider resistance R1, the branch pressure voltage of electric switch 23 is greater than the cut-ff voltage of described electric switch 23.Described electric switch 23 conductings.The coil L of described relay 24 has electric current process.The K switch closure of described relay 24.Described rectifier DB exports described direct voltage to described cooling module.Described cooling module work is lowered the temperature to the housing 10 of described light fixture 100.
In the time that the temperature in described housing 10 is less than described preset temperature, the resistance value of described thermistor RT1 is less than default resistance.Described in node output valve between described thermistor RT1 and described divider resistance R1, the branch pressure voltage of electric switch 23 is less than the cut-ff voltage of described electric switch 23.Described electric switch 23 ends.The coil L no current process of described relay 24.The K switch of described relay 24 disconnects.Between described rectifier DB and described cooling module, be connected disconnection.Described rectifier DB provides the described direct voltage of output to described cooling module.Described cooling module is not worked, thereby stops the housing 10 of described light fixture 100 to lower the temperature.
The periodic duty like this of described overheating protection circuit 20, realizes described light fixture is carried out to overtemperature protection.
Please continue to refer to Fig. 3; the second preferred embodiments of overheating protection circuit of the present invention is similar to the first preferred embodiments; the second preferred embodiments of described overheating protection circuit and the difference of the first preferred embodiments are: described thermistor RT2 is along with the rising of the temperature of its sensing, and the resistance value of himself reduces.The first output of described rectifier DB is connected to the control end of described electric switch 23 by described thermistor RT2.The control end of described electric switch 23 is also connected to the second output of described rectifier DB by described divider resistance R1.
In the time that the temperature in described housing 10 is greater than described preset temperature, the resistance value of described thermistor RT1 is less than default resistance.Described in node output valve between described thermistor RT1 and described divider resistance R1, the branch pressure voltage of electric switch 23 is greater than the cut-ff voltage of described electric switch 23.Described electric switch 23 conductings.The coil L of described relay 24 has electric current process.The K switch closure of described relay 24.Described rectifier DB exports described direct voltage to described cooling module.Described cooling module work is lowered the temperature to the housing 10 of described light fixture 100.
In the time that the temperature in described housing 10 is less than described preset temperature, the resistance value of described thermistor RT1 is greater than preset temperature.Described in node output valve between described thermistor RT1 and described divider resistance R1, the branch pressure voltage of electric switch 23 is less than the cut-ff voltage of described electric switch 23.Described electric switch 23 ends.The coil L no current process of described relay 24.The K switch of described relay 24 disconnects.Between described rectifier DB and described cooling module, be connected disconnection.Described rectifier DB provides the described direct voltage of output to described cooling module.Described cooling module is not worked, thereby stops the housing 10 of described light fixture 100 to lower the temperature.
This preferred embodiments, by periodic duty like this, has realized the overtemperature protection to described light fixture 100.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. an overheating protection circuit, is applied to light fixture so that described light fixture is carried out to overtemperature protection, and described overheating protection circuit comprises:
Voltage conversion unit, is connected to external AC power supply, so that the alternating voltage of external AC power supply output is converted to direct voltage;
Sensing partial pressure unit, is connected to described voltage conversion unit, to receive described direct voltage; Described sensing partial pressure unit is carried out dividing potential drop by the temperature in light fixture described in sensing to described direct voltage, to export branch pressure voltage;
Electric switch, is connected to described sensing partial pressure unit, to receive described branch pressure voltage, wherein, the break-make of electric switch described in the control of described sensing partial pressure unit;
Relay, is connected to described electric switch and described voltage conversion circuit, wherein, and the break-make of relay described in described electric switch control; And
Cooling element, is connected to described voltage conversion unit by described relay, wherein, and being connected between voltage conversion unit and described cooling element described in described Control;
In the time that the temperature of described light fixture is greater than preset temperature, electric switch cut-off described in the branch pressure voltage control of described sensing partial pressure unit output, thereby closed described relay, described voltage conversion unit is connected to described cooling element to provide described direct voltage that the work of described cooling element is lowered the temperature to described light fixture.
2. overheating protection circuit according to claim 1, it is characterized in that, described sensing partial pressure unit comprises thermistor and divider resistance, described thermistor and described divider resistance are connected between first output and the second output of described voltage conversion unit, the node of described thermistor and described divider resistance is connected to the control end of described electric switch, the first end of described electric switch is connected to the second output of described voltage conversion unit, the second end of described the second electric switch is connected to the first output of described power conversion unit by the coil of described relay.
3. overheating protection circuit according to claim 2; it is characterized in that; described thermistor is along with the rising of the temperature of its sensing; the resistance value of himself increases; the first output of described voltage conversion unit is connected to the control end of described electric switch by described divider resistance, the control end of described electric switch is also connected to the second output of described voltage conversion unit by described thermistor.
4. overheating protection circuit according to claim 2; it is characterized in that; described thermistor is along with the rising of the temperature of its sensing; the resistance value of himself reduces; the first output of described voltage conversion unit is connected to the control end of described electric switch by described thermistor, the control end of described electric switch is also connected to the second output of described voltage conversion unit by described divider resistance.
5. according to the overheating protection circuit described in any one in claim 2-4 item, it is characterized in that, described electric switch is NPN type triode, and control end, first end and second end of described electric switch is respectively base stage, emitter and the collector electrode of described triode.
6. overheating protection circuit according to claim 1, is characterized in that, described cooling element is cooling piece.
7. overheating protection circuit according to claim 6; it is characterized in that; described voltage conversion unit comprises transformer and rectifier; the primary coil of described transformer is connected to described extraneous AC power; the secondary coil of described transformer is connected to first input end and second input of described rectifier, and the first output of described rectifier and the second output are as the first output and second output of described voltage conversion unit.
8. overheating protection circuit according to claim 7, is characterized in that, described voltage conversion unit also comprises electric capacity, and the positive pole of described electric capacity is connected to the first output of described rectifier, and the negative pole of described electric capacity is connected to the second output of described rectifier.
9. overheating protection circuit according to claim 7; it is characterized in that; described voltage conversion unit also comprises voltage stabilizing didoe, and the positive pole of described voltage stabilizing didoe is connected to the second output of described rectifier, and the negative pole of described voltage stabilizing didoe is connected to the first output of described rectifier.
10. a light fixture, comprises housing and is arranged at the overheating protection circuit as described in claim 1-9 any one in described housing, so that described light fixture is carried out to overtemperature protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210437167.5A CN103813564A (en) | 2012-11-05 | 2012-11-05 | Lamp and protection circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210437167.5A CN103813564A (en) | 2012-11-05 | 2012-11-05 | Lamp and protection circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN103813564A true CN103813564A (en) | 2014-05-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210437167.5A Pending CN103813564A (en) | 2012-11-05 | 2012-11-05 | Lamp and protection circuit thereof |
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| CN (1) | CN103813564A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109955737A (en) * | 2019-04-28 | 2019-07-02 | 广州小鹏汽车科技有限公司 | Temperature of powered cell control device, method and electric car |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101749567A (en) * | 2008-12-16 | 2010-06-23 | 比亚迪股份有限公司 | LED system |
| CN102109161A (en) * | 2009-12-28 | 2011-06-29 | 建准电机工业股份有限公司 | Radiating module of lamp |
| CN102426356A (en) * | 2011-09-01 | 2012-04-25 | 浙江天正电气股份有限公司 | Distance relay |
| CN102593790A (en) * | 2011-01-05 | 2012-07-18 | 海洋王照明科技股份有限公司 | Lighting fixture overheating protection circuit and lighting fixture thereof |
| CN102740538A (en) * | 2011-04-13 | 2012-10-17 | 海洋王照明科技股份有限公司 | Led drive circuit |
| CN102762011A (en) * | 2011-04-29 | 2012-10-31 | 海洋王照明科技股份有限公司 | LED (Light Emitting Diode) constant-current dimming drive circuit device |
-
2012
- 2012-11-05 CN CN201210437167.5A patent/CN103813564A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101749567A (en) * | 2008-12-16 | 2010-06-23 | 比亚迪股份有限公司 | LED system |
| CN102109161A (en) * | 2009-12-28 | 2011-06-29 | 建准电机工业股份有限公司 | Radiating module of lamp |
| CN102593790A (en) * | 2011-01-05 | 2012-07-18 | 海洋王照明科技股份有限公司 | Lighting fixture overheating protection circuit and lighting fixture thereof |
| CN102740538A (en) * | 2011-04-13 | 2012-10-17 | 海洋王照明科技股份有限公司 | Led drive circuit |
| CN102762011A (en) * | 2011-04-29 | 2012-10-31 | 海洋王照明科技股份有限公司 | LED (Light Emitting Diode) constant-current dimming drive circuit device |
| CN102426356A (en) * | 2011-09-01 | 2012-04-25 | 浙江天正电气股份有限公司 | Distance relay |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109955737A (en) * | 2019-04-28 | 2019-07-02 | 广州小鹏汽车科技有限公司 | Temperature of powered cell control device, method and electric car |
| CN109955737B (en) * | 2019-04-28 | 2021-10-12 | 广州小鹏汽车科技有限公司 | Power battery temperature control device and method and electric automobile |
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Application publication date: 20140521 |
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