CN201388318Y - Driving circuit of LED light source - Google Patents
Driving circuit of LED light source Download PDFInfo
- Publication number
- CN201388318Y CN201388318Y CN200920036745U CN200920036745U CN201388318Y CN 201388318 Y CN201388318 Y CN 201388318Y CN 200920036745 U CN200920036745 U CN 200920036745U CN 200920036745 U CN200920036745 U CN 200920036745U CN 201388318 Y CN201388318 Y CN 201388318Y
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Abstract
The utility model provides a driving circuit of an LED light source. The driving circuit comprises a rectification filter circuit, a forward switch power circuit connected with the rectification filter circuit, a high frequency transformer and a DC output circuit connected with a secondary side of the high frequency transformer. The driving circuit is characterized in that the DC output end of the DC output circuit is connected with an LED circuit and a current-limiting voltage-limiting monitoring circuit; and the control output end of the current-limiting voltage-limiting monitoring circuit is connected with the control input end of the forward switch power circuit. By adopting the current-limiting voltage-limiting monitoring circuit for controlling the forward switch power circuit, the output voltage of the DC output circuit is controlled, and the power supply for the LED in the constant current mode can be realized.
Description
Technical field
The utility model relates to a kind of drive circuit of led light source.
Background technology
The driving effect of the drive circuit of existing LED street lamp is relatively poor, can not realize constant current control, thereby has influenced the useful life of LED street lamp, has increased use cost greatly, and has caused the wasting of resources.
The utility model content
Technical problem to be solved in the utility model provides a kind of drive circuit of led light source, is used for powering to LED with current constant mode.
For solving the problems of the technologies described above, the utility model provides a kind of drive circuit of led light source, comprise: filter rectifier, the positive activation type switching power circuit that links to each other with filter rectifier, high frequency transformer and with the secondary dc output circuit that links to each other of high frequency transformer, it is characterized in that: the dc output end of dc output circuit is connected with led circuit and current limiting pressure-limiting supervisory circuit, and the control output end of current limiting pressure-limiting supervisory circuit links to each other with the control input end of positive activation type switching power circuit.
Further, described positive activation type switching power circuit comprises switching tube and the oscillation control circuit that is used for by pwm signal driving switch pipe; The control input end of described positive activation type switching power circuit is the control input end of oscillation control circuit.
Further, the control output end of described current limiting pressure-limiting supervisory circuit links to each other with the control input end of oscillation control circuit through photoelectrical coupler.
Further, described current limiting pressure-limiting supervisory circuit comprises: first comparator circuit that is used for the pressure limiting monitoring that links to each other with dc output circuit and second comparator circuit that is used for the current limliting monitoring that links to each other with dc output circuit; The output of first comparator circuit and second comparator circuit links to each other with light-emitting diode in the described photoelectrical coupler.
The utlity model has positive effect: in the drive circuit of led light source of the present utility model, adopt current limiting pressure-limiting supervisory circuit control positive activation type switching power circuit, thereby the voltage of control dc output circuit output, and then realize powering to LED with current constant mode.
Description of drawings
Fig. 1 is the circuit block diagram of the drive circuit of the led light source among the embodiment.
Fig. 2 is the electrical schematic diagram of the drive circuit of the led light source among the embodiment.
Embodiment
(embodiment 1)
See Fig. 1-2, the drive circuit of the led light source of present embodiment comprises: filter rectifier 1, the positive activation type switching power circuit 3 that links to each other with filter rectifier 1, high frequency transformer 5 and with the secondary dc output circuit that links to each other 6 of high frequency transformer 5, it is characterized in that: the dc output end of dc output circuit 6 is connected with led circuit 2 and current limiting pressure-limiting supervisory circuit 7, and the control output end of current limiting pressure-limiting supervisory circuit 7 links to each other with the control input end of positive activation type switching power circuit 3.
Described positive activation type switching power circuit 3 comprises switching tube Q2 and the oscillation control circuit that is used for by pwm signal driving switch pipe Q2; The control input end of described positive activation type switching power circuit 3 is the control input end of oscillation control circuit.
The control output end of described current limiting pressure-limiting supervisory circuit 7 links to each other with the control input end of oscillation control circuit through photoelectrical coupler IC2.
Described current limiting pressure-limiting supervisory circuit 7 comprises: first comparator circuit that is used for the pressure limiting monitoring that links to each other with dc output circuit 6 and second comparator circuit that is used for the current limliting monitoring that links to each other with dc output circuit 6; The output of first comparator circuit and second comparator circuit links to each other with light-emitting diode among the described photoelectrical coupler IC2.
First comparator circuit comprises: the voltage-stabiliser tube series circuit, amplifier IC3A and the peripheral circuit thereof that are made of voltage-stabiliser tube DZ1, DZ2 and DZ25.Second comparator circuit comprises amplifier IC3B and peripheral circuit thereof.Oscillation control circuit comprises: vibration control chip IC1 (model of employing is 3843) and peripheral circuit thereof.Coil N3 is self-oscillatory positive feedback coil, and it links to each other by the positive feedback input of drive circuit with vibration control chip IC1.
Obviously, the foregoing description of the present utility model only is for the utility model example clearly is described, and is not to be qualification to execution mode of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all execution modes.And these belong to conspicuous variation or the change that spirit of the present utility model extended out and still are among the protection range of the present utility model.
Claims (4)
1, a kind of drive circuit of led light source, comprise: filter rectifier (1), the positive activation type switching power circuit (3) that links to each other with filter rectifier (1), high frequency transformer (5) and with the secondary dc output circuit that links to each other (6) of high frequency transformer (5), it is characterized in that: the dc output end of dc output circuit (6) is connected with led circuit (2) and current limiting pressure-limiting supervisory circuit (7), and the control output end of current limiting pressure-limiting supervisory circuit (7) links to each other with the control input end of positive activation type switching power circuit (3).
2, the drive circuit of led light source according to claim 1 is characterized in that: described positive activation type switching power circuit (3) comprises switching tube (Q2) and is used for oscillation control circuit by pwm signal driving switch pipe (Q2); The control input end of described positive activation type switching power circuit (3) is the control input end of oscillation control circuit.
3, the drive circuit of led light source according to claim 2 is characterized in that: the control output end of described current limiting pressure-limiting supervisory circuit (7) links to each other with the control input end of oscillation control circuit through photoelectrical coupler (IC2).
4, the drive circuit of led light source according to claim 3 is characterized in that: described current limiting pressure-limiting supervisory circuit (7) comprising: first comparator circuit that is used for the pressure limiting monitoring that links to each other with dc output circuit (6) and second comparator circuit that is used for the current limliting monitoring that links to each other with dc output circuit (6); The output of first comparator circuit and second comparator circuit links to each other with light-emitting diode in the described photoelectrical coupler (IC2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920036745U CN201388318Y (en) | 2009-02-25 | 2009-02-25 | Driving circuit of LED light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920036745U CN201388318Y (en) | 2009-02-25 | 2009-02-25 | Driving circuit of LED light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201388318Y true CN201388318Y (en) | 2010-01-20 |
Family
ID=41580861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920036745U Expired - Fee Related CN201388318Y (en) | 2009-02-25 | 2009-02-25 | Driving circuit of LED light source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201388318Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012155550A1 (en) * | 2011-05-19 | 2012-11-22 | Gao Yuan | Constant current driver circuit for led |
| CN104348372A (en) * | 2013-09-29 | 2015-02-11 | 深圳市伟创电气有限公司 | Auxiliary power supply circuit for forward switch power supply |
| CN104902646A (en) * | 2014-11-28 | 2015-09-09 | 成都冠深科技有限公司 | Life raft energy-saving system based on constant-current protection |
-
2009
- 2009-02-25 CN CN200920036745U patent/CN201388318Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012155550A1 (en) * | 2011-05-19 | 2012-11-22 | Gao Yuan | Constant current driver circuit for led |
| CN104348372A (en) * | 2013-09-29 | 2015-02-11 | 深圳市伟创电气有限公司 | Auxiliary power supply circuit for forward switch power supply |
| CN104902646A (en) * | 2014-11-28 | 2015-09-09 | 成都冠深科技有限公司 | Life raft energy-saving system based on constant-current protection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100120 Termination date: 20130225 |