CN204518119U - A kind of LED daylight lamp power supply - Google Patents
A kind of LED daylight lamp power supply Download PDFInfo
- Publication number
- CN204518119U CN204518119U CN201520275619.3U CN201520275619U CN204518119U CN 204518119 U CN204518119 U CN 204518119U CN 201520275619 U CN201520275619 U CN 201520275619U CN 204518119 U CN204518119 U CN 204518119U
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- daylight lamp
- large power
- power supply
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- 230000000087 stabilizing effect Effects 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000006378 damage Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
The utility model discloses a kind of LED daylight lamp power supply, comprise ac input end, rectification circuit, filter circuit, reference voltage-stabilizing circuit, constant-current source circuit and DC output end, LED daylight lamp comprises LED string; Ac input end connects the input of rectification circuit, and filter circuit is connected on the output of rectification circuit; Constant-current source circuit comprises large power triode and thermistor, and the anode of LED string first light-emitting diode connects the positive pole of rectification circuit output end.The negative electrode of last light-emitting diode of LED string connects the collector electrode of large power triode; Large power triode emitter connects the negative pole of rectification circuit output end by thermistor, and base stage connects the output of reference voltage-stabilizing circuit.The utility model carries out overtemperature protection by thermistor to large power triode Q1, can prevent that large power triode temperature is too high burns, and damages LED daylight lamp power supply.
Description
[technical field]
The utility model relates to daylight lamp power source, particularly relates to a kind of LED daylight lamp power supply.
[background technology]
Along with the development of modern electronic technology, LED daylight lamp power supply is seen everywhere, and they play irreplaceable effect inside field of power supplies.
The patent No. be 201120137213.0 utility model patent disclose a kind of LED daylight lamp power supply, comprising: rectification circuit, described rectification circuit plays and access mains is turned the effect of direct current; And filter circuit, described filter circuit plays Filtering and smoothing effect; And reference voltage-stabilizing circuit, described reference voltage-stabilizing circuit plays the effect providing 2.5V reference voltage; And constant-current source circuit, described constant-current source circuit comprises a large power triode, and the resistance of connecting with described large power triode emitter; Some light-emitting diodes, the positive pole that rectification circuit exports is directly connected to the positive pole of first light-emitting diode, and the negative pole of last light-emitting diode connects the collector electrode of large power triode.
Kind traditional LED daylight lamp power supply all Problems existing does not have temperature protection measure, thus the temperature caused in short circuit or other reasons too high in, power supply is caused to the destruction of unrepairable.
[summary of the invention]
The technical problems to be solved in the utility model be to provide a kind of not easily Yin Wendu too high and damage LED daylight lamp power supply.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of LED daylight lamp power supply, comprise ac input end, rectification circuit, filter circuit, reference voltage-stabilizing circuit, constant-current source circuit and DC output end, LED daylight lamp comprises LED string; Ac input end connects the input of rectification circuit, and filter circuit is connected on the output of rectification circuit; Constant-current source circuit comprises large power triode and thermistor, and the anode of LED string first light-emitting diode connects the positive pole of rectification circuit output end.The negative electrode of last light-emitting diode of LED string connects the collector electrode of large power triode; Large power triode emitter connects the negative pole of rectification circuit output end by thermistor, and base stage connects the output of reference voltage-stabilizing circuit.
Above-described LED daylight lamp power supply, reference voltage-stabilizing circuit comprises voltage stabilizing didoe and divider resistance, the anode of voltage stabilizing didoe connects the negative pole of current circuit output, negative electrode connects the first end of divider resistance, the anode of last 3rd light-emitting diode of the second termination LED string of divider resistance; The negative electrode of voltage stabilizing didoe is as the base stage of the output termination large power triode of reference voltage-stabilizing circuit.
Above-described LED daylight lamp power supply, reference voltage-stabilizing circuit comprises storage capacitor, the second end of a termination divider resistance of storage capacitor, the anode of another termination voltage stabilizing didoe.
Above-described LED daylight lamp power supply, comprises fin, and large power triode is installed on a heat sink; Described thermistor is semistor, and semistor is installed near fin.
The utility model LED daylight lamp power supply carries out overtemperature protection by thermistor to large power triode Q1, can prevent that large power triode temperature is too high burns, and damages LED daylight lamp power supply.
[accompanying drawing explanation]
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the circuit diagram of the utility model embodiment LED daylight lamp power supply.
[embodiment]
The circuit of the LED daylight lamp of the utility model embodiment as shown in Figure 1, comprises LED daylight lamp power supply and LED string.LED daylight lamp power supply comprises ac input end, rectification circuit, filter circuit, reference voltage-stabilizing circuit, constant-current source circuit and DC output end, and LED is serially connected in the DC output end of power supply, the external electric main AC of ac input end of power supply.
LED string is connected in series by 80 LED D1 to D80 and forms.
Electric main AC connects the input of rectification circuit BG1 through ac input end, and the electric capacity C1 of filter circuit is connected on the output of rectification circuit BG1.
Constant-current source circuit comprises large power triode Q1 and thermistor R1, and the anode of LED string first light-emitting diode D1 connects the positive pole of rectification circuit BG1 output.The negative electrode of last light-emitting diode of LED string D80 connects the collector electrode of large power triode Q1.Large power triode Q1 emitter connects the negative pole of rectification circuit BG1 output by thermistor R1, base stage connects the output of reference voltage-stabilizing circuit.
The negative pole that reference voltage-stabilizing circuit comprises voltage stabilizing didoe VS, storage capacitor C2 and divider resistance R2, the anode of voltage stabilizing didoe VS connects current circuit output, negative electrode connects the first end of divider resistance R2, the anode of last 3rd the light-emitting diode D78 of the second termination LED string of divider resistance R2.The negative electrode of voltage stabilizing didoe VS is as the base stage of the output termination large power triode Q1 of reference voltage-stabilizing circuit.Second end of the one termination divider resistance R2 of storage capacitor C2, the anode of another termination voltage stabilizing didoe VS.
In order to strengthen the heat radiation of large power triode Q1, large power triode Q1 installs on a heat sink.Thermistor R1 is semistor R1, and semistor R1 installs near fin, improves the sensitivity of overtemperature protection reaction.
The above embodiment of the utility model is lowered the temperature to large power triode Q1 by fin, carries out overtemperature protection by semistor to large power triode Q1, can prevent too high the burning of large power triode temperature and damage LED daylight lamp power supply.
Claims (4)
1. a LED daylight lamp power supply, is characterized in that, comprises ac input end, rectification circuit, filter circuit, reference voltage-stabilizing circuit, constant-current source circuit and DC output end, and LED daylight lamp comprises LED string; Ac input end connects the input of rectification circuit, and filter circuit is connected on the output of rectification circuit; Constant-current source circuit comprises large power triode and thermistor, and the anode of LED string first light-emitting diode connects the positive pole of rectification circuit output end; The negative electrode of last light-emitting diode of LED string connects the collector electrode of large power triode; Large power triode emitter connects the negative pole of rectification circuit output end by thermistor, and base stage connects the output of reference voltage-stabilizing circuit.
2. LED daylight lamp power supply according to claim 1, it is characterized in that, reference voltage-stabilizing circuit comprises voltage stabilizing didoe and divider resistance, the anode of voltage stabilizing didoe connects the negative pole of current circuit output, negative electrode connects the first end of divider resistance, the anode of last 3rd light-emitting diode of the second termination LED string of divider resistance; The negative electrode of voltage stabilizing didoe is as the base stage of the output termination large power triode of reference voltage-stabilizing circuit.
3. LED daylight lamp power supply according to claim 2, it is characterized in that, reference voltage-stabilizing circuit comprises storage capacitor, the second end of a termination divider resistance of storage capacitor, the anode of another termination voltage stabilizing didoe.
4. LED daylight lamp power supply according to claim 1, is characterized in that, comprise fin, and large power triode is installed on a heat sink; Described thermistor is semistor, and semistor is installed near fin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520275619.3U CN204518119U (en) | 2015-04-30 | 2015-04-30 | A kind of LED daylight lamp power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520275619.3U CN204518119U (en) | 2015-04-30 | 2015-04-30 | A kind of LED daylight lamp power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204518119U true CN204518119U (en) | 2015-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520275619.3U Expired - Fee Related CN204518119U (en) | 2015-04-30 | 2015-04-30 | A kind of LED daylight lamp power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204518119U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114721461A (en) * | 2022-04-27 | 2022-07-08 | 华荣科技股份有限公司 | Constant current source circuit with irradiation-resistant dual protection |
-
2015
- 2015-04-30 CN CN201520275619.3U patent/CN204518119U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114721461A (en) * | 2022-04-27 | 2022-07-08 | 华荣科技股份有限公司 | Constant current source circuit with irradiation-resistant dual protection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150729 |
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| CF01 | Termination of patent right due to non-payment of annual fee |