CN202841597U - LED constant-current driving power supply - Google Patents
LED constant-current driving power supply Download PDFInfo
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- CN202841597U CN202841597U CN 201220313740 CN201220313740U CN202841597U CN 202841597 U CN202841597 U CN 202841597U CN 201220313740 CN201220313740 CN 201220313740 CN 201220313740 U CN201220313740 U CN 201220313740U CN 202841597 U CN202841597 U CN 202841597U
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Abstract
The utility model discloses an LED constant-current driving power supply which uses an electronic transformer to supply power, an input protection circuit is designed at an input end, a constant-current driving chip has over-temperature protection function itself, and automatic protection can be realized when the temperature is too high so as to prevent the power supply and an LED load from damage. An LED current detection circuit controls the opening/closing of an MOS tube to better ensure the constant-current precision, make the LED load more stable and ensure higher working efficiency. The LED constant-current driving power supply has very good popularization and practical values.
Description
Technical field
The utility model relates to the driving power supply of a kind of LED constant current, belongs to LED lamp power technical field.
Background technology
In lighting technical field, led light source is as a kind of novel green energy conservation light source product, be widely used in social industry-by-industry, compare with traditional lighting, the LED semiconductor lamp has the advantages such as energy-saving and environmental protection, long service life, easy control, power supply is the matching used important component part of LED light fixture, and the design of power circuit is directly connected to the problems such as fail safe, energy-saving effect and useful life of LED light fixture.But, LED lamp power great majority adopt the constant current drive scheme at present, to guarantee stable brightness, and have problems in the electronic transformer compatibility, some appearance scintillations, the driving LED lamp power of this constant current, its design is unreasonable, poor stability, operating efficiency are lower, well compatibility more electronic transformer on the market.
The utility model content
The purpose of this utility model is in order to overcome the deficiency of above-mentioned technology, this power acquisition electronics transformer-supplied, and input has designed input protection circuit, and peripheral components is less; Constant-current driven chip carries the overheat protector function, can realize automatically protection protection in the excess Temperature situation, avoids power supply and LED load to damage; The LED current detection circuit opens and closes by the control metal-oxide-semiconductor and better guarantees to make the LED load more stable by constant current accuracy.
In order to solve the problems of the technologies described above; the utility model is achieved through the following technical solutions: the driving power supply of a kind of LED constant current, it includes input protection circuit, bridge rectifier filter circuit, capacitor filter, chip power supply circuit, constant-current driven chip, switching frequency initialization circuit, output circuit, LED current detection circuit part.It is characterized in that: the input at this power supply accesses a electronic transformer, and the drive circuit of this power supply is controlled in output access LED load by electronic transformer, thereby realizes the control to the LED load.
Described input protection circuit comprises the second resistance, the 3rd resistance; Two pins of the rectifier bridge input in this circuit and the bridge rectifier filter circuit are connected; When this electric circuit inspection becomes large to input current moment, and when surpassing the maximum of setting, the resistance absorption electric current in the circuit plays the effect of Limited Current and insurance;
Described capacitor filter is made of the second electrochemical capacitor, is connected with rectification bridge output end pin in the bridge rectifier filter circuit.
In power circuit, rectification circuit becomes interchange the direct current of pulsation, and the second electrochemical capacitor utilizes its charge-discharge characteristic, makes pulsating dc voltage after the rectification become relatively galvanic current and presses.
Described chip power supply circuit comprises the 4th diode, the first resistance, the 3rd electric capacity; The positive pole of the 4th diode is connected to the positive pole of the second electrochemical capacitor, and the first resistance links to each other with the negative pole of the 4th diode, and the other end is connected to an end of the 3rd electric capacity, the other end ground connection of the 3rd electric capacity; Be used for driving constant-current driven chip work.
Described switching frequency circuit comprises the 5th resistance, is connected on the 8th pin of constant-current driven chip, is used for the operating frequency of regulating system.
Described output circuit comprises the first inductance, the 5th diode, the first electric capacity; One end of the first inductance is connected to the positive pole of the 4th diode, and the other end is connected to the positive pole of the 5th diode, and an end of the first electric capacity is connected to the positive pole of the 4th diode, and the other end is connected to the negative pole of the 5th diode; Be used for guaranteeing the stable output of LED load.
Described LED current detection circuit comprises metal-oxide-semiconductor, the 6th resistance, the 7th resistance; The grid of metal-oxide-semiconductor is received on the 4th pin of constant-current driven chip, and drain electrode is connected to the positive pole of the 5th diode, and source electrode is connected on the second pin of constant-current driven chip, and the 6th resistance, the 7th resistance link to each other other end ground connection with the source electrode of metal-oxide-semiconductor; Electric current by LED is set by the 6th resistance, the 7th resistance, when the magnitude of voltage of the 6th resistance, the 7th resistance surpasses set point, closes outside metal-oxide-semiconductor.
Description of drawings
Accompanying drawing 1 is the connection diagram of the utility model power driving circuit;
Accompanying drawing 2 is principle schematic of the utility model power driving circuit.
As shown in the figure, various piece is represented by following Arabic numerals among the figure:
1. electronic transformer, 2. input protection circuit, 3. bridge rectifier filter circuit, 4. capacitor filter, 5. chip power supply circuit, 6. constant-current driven chip, 7. switching frequency initialization circuit, 8.LED current detection circuit, 9. output circuit, 10.LED load.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail:
As shown in Figure 1 and Figure 2; the driving power supply of a kind of LED constant current, it includes 1, electronic transformer 2, input protection circuit 3, bridge rectifier filter circuit 4, capacitor filter 5, chip power supply circuit 6, constant-current driven chip 7, switching frequency initialization circuit 8, LED current detection circuit 9, output circuit 10, LED load 10 parts.It is characterized in that: the input at this power supply accesses a electronic transformer 1, output access LED load 10, and by the drive circuit of electronic transformer 1 this power supply of control, thereby realization is to the control of LED load 10.
Shown in Figure 2, described input protection circuit 2 comprises the second resistance, the 3rd resistance; Two pins of the rectifier bridge input in this circuit and the bridge rectifier filter circuit 3 are connected.
Shown in Figure 2, described capacitor filter 4 is made of the second electrochemical capacitor, is connected with rectification bridge output end pin in the bridge rectifier filter circuit 3.
Shown in Figure 2, described chip power supply circuit 5 comprises the 4th diode, the first resistance, the 3rd electric capacity; The positive pole of the 4th diode is connected to the positive pole of the second electrochemical capacitor, and the first resistance links to each other with the negative pole of the 4th diode, and the other end is connected to an end of the 3rd electric capacity, the other end ground connection of the 3rd electric capacity.
Shown in Figure 2, described switching frequency circuit 7 comprises the 5th resistance, links to each other with the 8th pin of constant-current driven chip.
Shown in Figure 2, described output circuit 9 comprises the first inductance, the 5th diode, the first electric capacity; One end of the first inductance is connected to the positive pole of the 4th diode, and the other end is connected to the positive pole of the 5th diode, and an end of the first electric capacity is connected to the positive pole of the 4th diode, and the other end is connected to the negative pole of the 5th diode.
Shown in Figure 2, described LED current detection circuit 8 comprises metal-oxide-semiconductor, the 6th resistance, the 7th resistance; The grid of metal-oxide-semiconductor is received on the 4th pin of constant-current driven chip, and drain electrode is connected to the positive pole of the 5th diode, and source electrode is connected on the second pin of constant-current driven chip, and the 6th resistance, the 7th resistance link to each other other end ground connection with the source electrode of metal-oxide-semiconductor.
Above embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit, although with reference to previous embodiment the utility model is had been described in detail, those of ordinary skill in the art is to be understood that, it still can be made amendment to the technical scheme of previous embodiment record, or its part technical characterictic is equal to replacement, and these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of technical solutions of the utility model.
Claims (8)
1. driving power supply of LED constant current, it comprises electronic transformer (1), input protection circuit (2), bridge rectifier filter circuit (3), capacitor filter (4), chip power supply circuit (5), constant-current driven chip (6), switching frequency initialization circuit (7), LED current detection circuit (8), output circuit (9), LED load (10).It is characterized in that: the input at this power supply accesses a electronic transformer (1), and the drive circuit of this power supply is controlled in output access LED load (10) by electronic transformer (1), thereby realizes the control to LED load (10).
2. the driving power supply of a kind of LED constant current according to claim 1 is characterized in that, input protection circuit comprises the second resistance, the 3rd resistance; Two pins of the rectifier bridge input in this circuit and the bridge rectifier filter circuit are connected; When this electric circuit inspection becomes large to input current moment, and when surpassing the maximum of setting, the resistance absorption electric current in the circuit plays the effect of Limited Current and insurance.
3. the driving power supply of a kind of LED constant current according to claim 1 is characterized in that, capacitor filter is made of the second electrochemical capacitor, is connected with rectification bridge output end pin in the bridge rectifier filter circuit.
4. the driving power supply of a kind of LED constant current according to claim 1, it is characterized in that, in power circuit, rectification circuit becomes interchange the direct current of pulsation, the second electrochemical capacitor utilizes its charge-discharge characteristic, makes pulsating dc voltage after the rectification become relatively galvanic current and presses.
5. the driving power supply of a kind of LED constant current according to claim 1 is characterized in that, chip power supply circuit comprises the 4th diode, the first resistance, the 3rd electric capacity; The positive pole of the 4th diode is connected to the positive pole of the second electrochemical capacitor, and the first resistance links to each other with the negative pole of the 4th diode, and the other end is connected to an end of the 3rd electric capacity, the other end ground connection of the 3rd electric capacity; Be used for driving constant-current driven chip work.
6. the driving power supply of a kind of LED constant current according to claim 1 is characterized in that, the switching frequency circuit comprises the 5th resistance, is connected on the 8th pin of constant-current driven chip, is used for the operating frequency of regulating system.
7. the driving power supply of a kind of LED constant current according to claim 1 is characterized in that, output circuit comprises the first inductance, the 5th diode, the first electric capacity; One end of the first inductance is connected to the positive pole of the 4th diode, and the other end is connected to the positive pole of the 5th diode, and an end of the first electric capacity is connected to the positive pole of the 4th diode, and the other end is connected to the negative pole of the 5th diode; Be used for guaranteeing the stable output of LED load.
8. the driving power supply of a kind of LED constant current according to claim 1 is characterized in that, the LED current detection circuit comprises metal-oxide-semiconductor, the 6th resistance, the 7th resistance; The grid of metal-oxide-semiconductor is received on the 4th pin of constant-current driven chip, and drain electrode is connected to the positive pole of the 5th diode, and source electrode is connected on the second pin of constant-current driven chip, and the 6th resistance, the 7th resistance link to each other other end ground connection with the source electrode of metal-oxide-semiconductor; Electric current by LED is set by the 6th resistance, the 7th resistance, when the magnitude of voltage of the 6th resistance, the 7th resistance surpasses set point, closes outside metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220313740 CN202841597U (en) | 2012-07-02 | 2012-07-02 | LED constant-current driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220313740 CN202841597U (en) | 2012-07-02 | 2012-07-02 | LED constant-current driving power supply |
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| Publication Number | Publication Date |
|---|---|
| CN202841597U true CN202841597U (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220313740 Expired - Lifetime CN202841597U (en) | 2012-07-02 | 2012-07-02 | LED constant-current driving power supply |
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| Country | Link |
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| CN (1) | CN202841597U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103327669A (en) * | 2013-06-08 | 2013-09-25 | 成都成电硅海科技股份有限公司 | LED driving circuit |
| CN111935874A (en) * | 2018-04-20 | 2020-11-13 | 上海路傲电子科技有限公司 | Linear constant-current driving chip and multi-chip parallel LED lighting circuit |
-
2012
- 2012-07-02 CN CN 201220313740 patent/CN202841597U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103327669A (en) * | 2013-06-08 | 2013-09-25 | 成都成电硅海科技股份有限公司 | LED driving circuit |
| CN111935874A (en) * | 2018-04-20 | 2020-11-13 | 上海路傲电子科技有限公司 | Linear constant-current driving chip and multi-chip parallel LED lighting circuit |
| CN111935874B (en) * | 2018-04-20 | 2023-09-05 | 上海路傲电子科技有限公司 | Linear constant current driving chip and multi-chip parallel LED lighting circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: HEBEI PENGYUAN OPTOELECTRONICS TECHNOLOGY CO., LTD Free format text: FORMER NAME: QINHUANGDAO PENGYUAN OPTOELECTRONICS TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 066004 Longhai Road, Qinhuangdao economic and Technological Development Zone, Hebei, No. 55 Patentee after: HEBEI PENGYUAN OPTOELECTRONICS CO.,LTD. Address before: 066000 F zone, national hi tech innovation center, Longhai Road, Qinhuangdao Development Zone, Hebei Patentee before: QINHUANGDAO PENGYUAN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20130327 |
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| CX01 | Expiry of patent term |