CN104519631A - LED drive - Google Patents
LED drive Download PDFInfo
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- CN104519631A CN104519631A CN201310470039.5A CN201310470039A CN104519631A CN 104519631 A CN104519631 A CN 104519631A CN 201310470039 A CN201310470039 A CN 201310470039A CN 104519631 A CN104519631 A CN 104519631A
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- 238000001914 filtration Methods 0.000 claims abstract description 18
- 238000013016 damping Methods 0.000 claims description 14
- 230000000052 comparative effect Effects 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 description 20
- 238000004146 energy storage Methods 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006424 Flood reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The invention provides an LED drive comprising an input unit I, a rectifying and filtering unit II, a self-oscillation power supply unit III, a turn-off unit IV and an output unit V. The input unit I is used for alternating-current voltage input; the rectifying and filtering unit II is used for converting alternating-current voltage into direct-current voltage; the self-oscillation power supply unit III is used for converting the direct-current voltage into the high-frequency direct-current voltage; the turn-off unit IV is connected with the self-oscillation power supply unit III and used for turning off a switch element in the self-oscillation power supply unit III.
Description
Technical field
The present invention relates to lighting technical field, especially a kind of LED drives.
Background technology
Semiconductor lighting (LED) is light source and the display device of third generation semi-conducting material manufacturing, and having the features such as power consumption is few, the life-span long, pollution-free, rich color, controllability are strong, is the revolution of lighting source and light industry.Along with the development of LED, increasing LED illumination product floods the market.The electric drive part of LED is an indispensable part in LED illumination product.
IC that constant-current LED driver circuit in the market uses is to drive field effect transistor (MOSFET).This programme is attempted proposing a kind of IC turning off control, not Direct driver switch element, but using the control mode of shutdown switch element to realize the control of driver circuit, LED being driven triode can be used as switch element, is one of current lighting technical field problem demanding prompt solution.
Summary of the invention
Technical scheme of the present invention drives for providing a kind of LED, comprising: input unit I, rectification filtering unit II, self-oscillation power supply unit III, shutoff unit IV and output unit V, wherein:
Input unit I, inputs for alternating voltage;
Rectification filtering unit II, is connected with input unit I, for alternating voltage is converted to direct voltage;
Self-oscillation power supply unit III, is connected with above-mentioned rectification filtering unit II, for above-mentioned direct voltage is converted to high-frequency direct-current voltage;
Turning off unit IV, being connected with above-mentioned self-oscillation power supply unit III, for turning off the switch element (206) in above-mentioned self-oscillation power supply unit III;
Output unit V, is connected with above-mentioned self-oscillation power supply unit III, is also load supplying for compressing into row filtering to high-frequency DC.
Preferably, above-mentioned shutoff unit IV comprises the first acquisition elements (411), the second acquisition elements (422), control element (433), cut-off device (444), power supply component (455), wherein:
Above-mentioned first acquisition elements (411), for gathering reference level signal;
Above-mentioned second acquisition elements (422), for gathering level feed-back signal;
Above-mentioned control element (433), for the reference level signal of above-mentioned first acquisition elements (411) and the level feed-back signal of above-mentioned second acquisition elements (422) being compared, and sends corresponding control signal according to comparative result;
Above-mentioned cut-off device (444), the control signal sent for receiving above-mentioned control element (433) turns off the switch element (206) in self-oscillation power supply unit III;
Above-mentioned power supply component (455), for being above-mentioned cut-off device (444) and above-mentioned control element (433) power supply.
Preferably, containing damping element (207) in above-mentioned self-oscillation power supply unit III, above-mentioned second acquisition elements (422) is for gathering the level feed-back signal of above-mentioned damping element (207).
Preferably, above-mentioned control signal comprises: when level feed-back signal is greater than reference level signal, then above-mentioned control element (433) produces and turns off control signal to above-mentioned cut-off device (444); When level feed-back signal is less than reference level signal, then above-mentioned control element (433) does not produce shutoff control signal.
Preferably, above-mentioned reference level signal is provided by chip internal power supply or is provided by external power source.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention;
Fig. 2 is the structural representation of one of the embodiment of the present invention;
Fig. 3 is the structural representation of the self-oscillation power supply unit of the embodiment of the present invention;
Fig. 4 is the structural representation of the shutoff unit of the embodiment of the present invention;
Fig. 5 is the concrete structure schematic diagram of the shutoff unit of the embodiment of the present invention;
Fig. 6 is the structural representation of the embodiment of the present invention two;
Fig. 7 is the structural representation of the embodiment of the present invention three.
Embodiment
Below in conjunction with the drawings and specific embodiments, a kind of LED driving that the present invention proposes is described in further detail.
This programme proposes a kind of IC turning off control, not Direct driver switch element, but uses the control mode of shutdown switch element to realize the control of driver circuit, LED is driven triode can be used as switch element.Self-oscillation LED driver circuit can be mainly used in, realize the constant current accuracy improving self-oscillation LED driver circuit, realize High Power Factor, realize dimming function etc., thus reduce the cost of LED driver, improve the LED product market competitiveness.
Fig. 1 is the structural representation of the embodiment of the present invention; Fig. 2 is the structural representation of one of the embodiment of the present invention;
A kind of LED drives, and comprises input unit I, rectification filtering unit II, self-oscillation power supply unit III, turns off unit IV and output unit V, wherein:
Input unit I, inputs for alternating voltage;
Rectification filtering unit II, is connected with input unit I, for alternating voltage is converted to direct voltage;
Self-oscillation power supply unit III, is connected with rectification filtering unit II, for direct voltage is converted to high-frequency direct-current voltage;
Turning off unit IV, being connected with self-oscillation power supply unit III, for turning off the switch element 206 in self-oscillation power supply unit III.
Output unit V, is connected with self-oscillation power supply unit III, is also load supplying for compressing into row filtering to high-frequency DC.
Fig. 3 is the structural representation of the self-oscillation power supply unit of the embodiment of the present invention; Wherein, self-oscillation power supply unit III comprises: start unit 311, switch element 206, damping element 207 and supply control unit 312.
The first end that start unit 311 comprises the first resistance 201 and the first diode 202, first resistance 201 be connected in series is connected with rectification filtering unit II, and the second end of the first diode 202 is connected with shutoff unit IV.
Above-mentioned switch element 206 and damping element 207 are connected in series, and the second end of damping element 207 connects with shutoff unit IV, and the ground level of switch element 206 is then connected with supply control unit 312 with collector electrode.
Fig. 4 is the structural representation of the shutoff unit of the embodiment of the present invention, and Fig. 5 is the concrete structure schematic diagram of the shutoff unit of the embodiment of the present invention.
In embodiments of the present invention, turn off unit IV to comprise:
First acquisition elements 411: for gathering reference level signal; Above-mentioned collection reference level signal can be provided by chip internal power supply, or is provided by external power source.
Second acquisition elements 422: for gathering the level feed-back signal of damping element 207 in self-oscillation power supply unit III;
Control element 433: for the level feed-back signal of the reference level signal of the first acquisition elements 411 and the second acquisition elements 422 is compared, and send corresponding control signal according to comparative result;
Further, in this programme, as level feed-back signal is greater than reference level signal, then control element 433 produces and turns off control signal to cut-off device 444.When level feed-back signal is less than reference level signal, then control element 433 does not produce shutoff control signal.
Cut-off device 444: the shutoff control signal sent for receiving control element 433 turns off the switch element 206 in self-oscillation power supply unit III;
Power supply component 455: for powering for cut-off device 444 and control element 433.Wherein, power supply component 455 is by obtaining power supply from external power source.
Specifically, in embodiments of the present invention:
Startup stage, after LED driving of the present invention is connected to DC input voitage DC, DC passes through the first resistance 201, the base stage of inductive element 203 and capacitive element 209 and switch element 206 and emitter, carry out electric discharge generation current, make switch element 206 conducting.DC carries out electric discharge generation current by the collector and emitter of switch element 206 and inductive element 203 and capacitive element 209.After this, LED of the present invention was driven into for the first energy storage stage.
First energy storage stage, electric current is by switch element 206, inductive element 203, and capacitive element 209, inductive element 203 energy storage also produces voltage at its two ends, simultaneously inductive element 203 pair produces induced electromotive force around responding to by inductive element 203, and induced electromotive force carries out electric discharge generation current by the base stage of the first electric capacity 204, second resistance 205 and switch element 206 and emitter, makes switch element 206 be in saturation conduction state.The electric current flowing through damping resistance 207 increases, and the voltage at damping resistance 207 two ends raises.When damping resistance 207 both end voltage increases to over shutoff unit IV reference level signal, turn off unit IV work, the base stage of switch element 206 is turned off unit IV short circuit, and switch element 206 ends.But because the electric current flowing through inductive element 203 can not suddenly change, therefore this electric current is flow to by the second diode 208 and exports for capacitive element 209, and makes inductive element 203 both end voltage reverse.After this, optical semiconductor source driving system of the present invention enters and releases the energy stage.
Release the energy stage, inductive element 203 pair is reverse equally around responding to by inductive element 203 induced electromotive force produced.Induced electromotive force carries out electric discharge generation current by the first diode 202, second resistance 205, first electric capacity 204.Inductive element 203 both end voltage is discharged to output capacitive element 209 by the second diode 208, and inductive element 203 releases energy.Electric current produces reverse voltage to the first electric capacity 204 reverse charging.When the first electric capacity 204 both end voltage is increased to inductive element 203 pair around both end voltage, stop releasing energy.After this, LED drive system of the present invention entered for the second energy storage stage.
Second energy storage stage, capacity cell 209 both end voltage is discharged by semiconductor light sources LED load, first electric capacity 204 both end voltage is discharged by the base stage of switch element 206 and the secondary coiling of emitter, the second resistance 205 and inductive element 203, generation current, makes the collector and emitter conducting of switch element 206.DC carries out electric discharge generation current by the collector and emitter of inductive element 203 and capacitive element 209 and switch element 206.Inductive element 203 starts energy storage, produces voltage at its two ends.Next, the pair of inductive element 203 produces induced electromotive force around responding to by inductive element 203, induced electromotive force carries out electric discharge generation current by the base stage of the first electric capacity 204, second resistance 205 and switch element 206 and emitter, makes switch element 206 be in saturation conduction.The electric current flowing through damping resistance 207 increases, and the voltage at damping resistance 207 two ends raises.When damping resistance 207 both end voltage increases to over shutoff unit IV reference level signal, turn off unit IV work, the base stage of switch element 206 is turned off unit IV short circuit, and switch element 206 ends.But can not suddenly change due to the electric current flowing through inductive element 203, therefore this electric current is flow to by the second diode 208 and exports for capacitive element 209, and makes inductive element 203 both end voltage reverse.After this, optical semiconductor source driving system of the present invention again enters and releases the energy stage.
Then, optical semiconductor source driving system of the present invention can enter for the second energy storage stage from releasing in the stage again, so circulated.
Fig. 6 is the structural representation of the embodiment of the present invention two; Fig. 7 is the structural representation of the embodiment of the present invention three.Same, input unit, inputs for alternating voltage; Rectification filtering unit, is connected with input unit, for alternating voltage is converted to direct voltage; Self-oscillation power supply unit, is connected with rectification filtering unit, for direct voltage is converted to high-frequency direct-current voltage; Turning off unit IV, being connected with self-oscillation power supply unit, for turning off the switch element 206 in self-oscillation power supply unit.
Output unit, is connected with self-oscillation power supply unit, is also load supplying for compressing into row filtering to high-frequency DC.
Description of the preferred embodiment of the present invention is to illustrate and describing above, and undesired is limit of the present invention or be confined to disclosed concrete form, obviously, many modifications and variations may be made, these modifications and variations may be obvious to those skilled in the art, should be included within the scope of the present invention that defined by appended claims.
Claims (5)
1. a LED drives, and it is characterized in that, comprises input unit I, rectification filtering unit II, self-oscillation power supply unit III, turns off unit IV and output unit V, wherein:
Input unit I, inputs for alternating voltage;
Rectification filtering unit II, is connected with described input unit I, for alternating voltage is converted to direct voltage;
Self-oscillation power supply unit III, is connected with described rectification filtering unit II, for described direct voltage is converted to high-frequency direct-current voltage;
Turning off unit IV, being connected with described self-oscillation power supply unit III, for turning off the switch element (206) in described self-oscillation power supply unit III;
Output unit V, is connected with described self-oscillation power supply unit III, is also load supplying for compressing into row filtering to high-frequency DC.
2. LED according to claim 1 drives, and it is characterized in that, described shutoff unit IV comprises the first acquisition elements (411), the second acquisition elements (422), control element (433), cut-off device (444), power supply component (455), wherein:
Described first acquisition elements (411), for gathering reference level signal;
Described second acquisition elements (422), for gathering level feed-back signal;
Described control element (433), for the reference level signal of described first acquisition elements (411) and the level feed-back signal of described second acquisition elements (422) being compared, and sends corresponding control signal according to comparative result;
Described cut-off device (444), the control signal sent for receiving described control element (433) turns off the switch element (206) in self-oscillation power supply unit III;
Described power supply component (455), for being described cut-off device (444) and described control element (433) power supply.
3. LED according to claim 2 drives, and it is characterized in that, containing damping element (207) in described self-oscillation power supply unit III, described second acquisition elements (422) is for gathering the level feed-back signal of described damping element (207).
4. LED according to claim 2 drives, and it is characterized in that, described control signal comprises: when level feed-back signal is greater than reference level signal, then described control element (433) produces and turns off control signal to described cut-off device (444); When level feed-back signal is less than reference level signal, then described control element (433) does not produce shutoff control signal.
5. LED according to claim 2 drives, and it is characterized in that, described reference level signal is provided by chip internal power supply or provided by external power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310470039.5A CN104519631A (en) | 2013-10-07 | 2013-10-07 | LED drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310470039.5A CN104519631A (en) | 2013-10-07 | 2013-10-07 | LED drive |
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| Publication Number | Publication Date |
|---|---|
| CN104519631A true CN104519631A (en) | 2015-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310470039.5A Pending CN104519631A (en) | 2013-10-07 | 2013-10-07 | LED drive |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101668363A (en) * | 2008-09-05 | 2010-03-10 | 艾默龙电子科技（嘉兴）有限公司 | High-efficiency drive control method for LED |
| US20100308733A1 (en) * | 2009-06-09 | 2010-12-09 | Stmicroelectronics, Inc. | Apparatus and method for constant power offline led driver |
| CN102035415A (en) * | 2010-12-24 | 2011-04-27 | 无锡更芯集成科技有限公司 | Constant-current implementation method for isolated AC/DC switched power supply for LED illumination drive and special device thereof |
| CN102076148A (en) * | 2009-11-09 | 2011-05-25 | 东芝照明技术株式会社 | Led lighting device and illuminating device |
| CN203618180U (en) * | 2013-10-07 | 2014-05-28 | 欧普照明股份有限公司 | LED driving apparatus |
-
2013
- 2013-10-07 CN CN201310470039.5A patent/CN104519631A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101668363A (en) * | 2008-09-05 | 2010-03-10 | 艾默龙电子科技（嘉兴）有限公司 | High-efficiency drive control method for LED |
| US20100308733A1 (en) * | 2009-06-09 | 2010-12-09 | Stmicroelectronics, Inc. | Apparatus and method for constant power offline led driver |
| CN102076148A (en) * | 2009-11-09 | 2011-05-25 | 东芝照明技术株式会社 | Led lighting device and illuminating device |
| CN102035415A (en) * | 2010-12-24 | 2011-04-27 | 无锡更芯集成科技有限公司 | Constant-current implementation method for isolated AC/DC switched power supply for LED illumination drive and special device thereof |
| CN203618180U (en) * | 2013-10-07 | 2014-05-28 | 欧普照明股份有限公司 | LED driving apparatus |
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Application publication date: 20150415 |
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