CN102387643A - LED (light emitting diode) -driven IC (integrated circuit) - Google Patents
LED (light emitting diode) -driven IC (integrated circuit) Download PDFInfo
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- CN102387643A CN102387643A CN201110391883XA CN201110391883A CN102387643A CN 102387643 A CN102387643 A CN 102387643A CN 201110391883X A CN201110391883X A CN 201110391883XA CN 201110391883 A CN201110391883 A CN 201110391883A CN 102387643 A CN102387643 A CN 102387643A
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Abstract
The invention relates to an LED (light emitting diode)-driven IC (integrated circuit), comprising a voltage stabilizing and controlling circuit, a first current limiting circuit, a second current detecting circuit and a second current limiting circuit, wherein the first current limiting current and the second current limiting circuit are respectively connected to a voltage stabilizing and controlling circuit and are connected to an external LED stack; and the second current detecting circuit is connected between the second current limiting circuit and the voltage stabilizing and controlling circuit and is used for detecting whether a current flows through and transmitting a detection result to the voltage stabilizing and controlling circuit; and the voltage stabilizing and controlling circuit controls the current output and close of the second current limiting circuit according to the detection result of the second current detecting circuit. By adopting the LED-driven IC provided by the invention, low-voltage starting and low-current starting effects can be realized.
Description
Technical field
The present invention relates to the drive circuit field of lighting device, particularly a kind of chip for driving of LED lamp.
Background technology
LED drive IC of the prior art mostly is to adopt constant-current driving or constant voltage driving device, so the output current of LED drive IC or output voltage are constant; Existing great power LED mostly adopts series system, but LED can not start, so need make improvements at the brownout through several LED after making easily after a plurality of series connection.
Summary of the invention
Main purpose of the present invention is to provide a kind of LED drive IC that can realize that low voltage starting, low current start.
The present invention adopts following technical scheme:
A kind of LED drive IC is characterized in that: comprise voltage stabilizing and control circuit, first current-limiting circuit, current detection circuit and second current-limiting circuit; Said first current-limiting circuit, second current-limiting circuit are connected to voltage stabilizing and control circuit respectively, and are connected to outside LED and pile up; Said current detection circuit is connected between second current-limiting circuit and voltage stabilizing and the control circuit, and whether be used for detecting has electric current to pass through, and testing result is flowed to voltage stabilizing and control circuit; Said voltage stabilizing and control circuit are controlled the electric current output of second current-limiting circuit according to the testing result of second current detection circuit or are closed.
Said LED drive IC also comprises extra current testing circuit and the additional current-limiting circuit that at least one and second current detection circuit are identical with current-limiting circuit; Said extra current testing circuit also is connected to voltage stabilizing and control circuit, and is used to connect outside LED and piles up; Said extra current testing circuit is connected between additional current-limiting circuit and voltage stabilizing and the control circuit, and whether be used for detecting has electric current to pass through, and testing result is flowed to voltage stabilizing and control circuit; Said voltage stabilizing and control circuit are controlled the electric current output of additional current-limiting circuit according to the testing result of extra current testing circuit or are closed.
Said second current-limiting circuit is composed in series by current-limiting resistance and controllable silicon each other.
The D.C. regulated power supply that the inner voltage stabilizing circuit of said voltage stabilizing and control circuit provides 15V is to internal control circuit.
Said LED drive IC comprises four groups of extra current testing circuits and additional current-limiting circuit.
Said LED piles up by several LED and is in series.
The external back of current-limiting resistance in the additional current-limiting circuit of said last group ground connection.
Compare with the LED drive IC of prior art, LED drive IC according to the invention can realize that low voltage starting, low current start, and current detection circuit opens or closes current-limiting circuit when detecting low-voltage or low current, realize intelligent management.
Description of drawings
Fig. 1 is the application circuit schematic diagram of LED drive IC of the present invention.
Embodiment
Below with embodiment the present invention is described further.
As shown in Figure 1; It is the application circuit schematic diagram of LED drive IC of the present invention; Said LED drive IC comprises voltage stabilizing and control circuit 1; Five groups of current detection circuits 2, and six groups of current-limiting circuits, said voltage stabilizing and control circuit 1 inner voltage stabilizing circuit provide D.C. regulated power supply (+15V) give inner control circuit; Whether current detection circuit 2 is used for detecting has electric current to pass through, and testing result is flowed to voltage stabilizing and control circuit 1; Because first group of current-limiting circuit need not be provided with current detection circuit 2, so have only five groups current detection circuit 2 in the whole LED chip; Current-limiting circuit is made up of controllable silicon and current-limiting resistance.
As shown in Figure 1, the positive supply input (VAC) of said LED drive IC connects through the positive voltage (but proof voltage 500V DC) after the bridge rectifier full-wave rectification, and connects the anode that first LED piles up N1; The controllable silicon Q1 of first group of current-limiting circuit connects current-limiting resistance R1 and voltage stabilizing and control circuit 1 respectively, and another pin DK1 is connected to first LED and piles up the negative electrode of N1 and the anode that second LED piles up N2; The controllable silicon Q2 of second group of current-limiting circuit connects current-limiting resistance R2 and voltage stabilizing and control circuit 1 respectively, and another pin DK2 is connected to second LED and piles up the negative electrode of N2 and the anode that the 3rd LED piles up N3; The controllable silicon Q3 of the 3rd group of current-limiting circuit connects current-limiting resistance R3 and voltage stabilizing and control circuit 1 respectively, and another pin DK3 is connected to the 3rd LED and piles up the negative electrode of N3 and the anode that the 4th LED piles up N4; The controllable silicon Q4 of the 4th group of current-limiting circuit connects current-limiting resistance R4 and voltage stabilizing and control circuit 1 respectively, and another pin DK4 is connected to the 4th LED and piles up the negative electrode of N4 and the anode that the 5th LED piles up N5; The controllable silicon Q5 of the 5th group of current-limiting circuit connects current-limiting resistance R5 and voltage stabilizing and control circuit 1 respectively, and another pin DK5 is connected to the 5th LED and piles up the negative electrode of N5 and the anode that the 6th LED piles up N6; The controllable silicon Q6 of the 6th group of current-limiting circuit connects current-limiting resistance R6 and voltage stabilizing and control circuit 1 respectively, and another pin DK6 is connected to the negative electrode that the 6th LED piles up N6; Current-limiting resistance R1-R5 all is connected to electric power loop (VAC_RTN), and current-limiting resistance R6 is external and be connected to electric power loop; Each is organized current detection circuit 2 and is connected between voltage stabilizing and control circuit 1 and the controllable silicon of respectively organizing current-limiting circuit (Q2-Q6) and current-limiting resistance (R1-R5) except that first group.
When low pressure, current detection circuit 2 sends detected result to voltage stabilizing and control circuit 1, controls opening of first group of current-limiting circuit again, lights first LED and piles up; When voltage raises, current detection circuit 2 detects when satisfying condition, and second group current-limiting circuit is opened, and output current is lighted second LED and piled up, and is elevated to when satisfying full terms whole outputs of LED drive IC by that analogy until voltage; Otherwise when voltage reduced, each current detection circuit 2 detected successively and controls and respectively organize closing of current-limiting circuit, is low to moderate Close All until voltage, realized shutdown.
Claims (7)
1. a LED drive IC is characterized in that: comprise voltage stabilizing and control circuit, first current-limiting circuit, current detection circuit and second current-limiting circuit; Said first current-limiting circuit, second current-limiting circuit are connected to voltage stabilizing and control circuit respectively, and are connected to outside LED and pile up; Said current detection circuit is connected between second current-limiting circuit and voltage stabilizing and the control circuit, and whether be used for detecting has electric current to pass through, and testing result is flowed to voltage stabilizing and control circuit; Said voltage stabilizing and control circuit are controlled the electric current output of second current-limiting circuit according to the testing result of second current detection circuit or are closed.
2. LED drive IC according to claim 1 is characterized in that: said LED drive IC also comprises extra current testing circuit and the additional current-limiting circuit that at least one and second current detection circuit are identical with current-limiting circuit; Said extra current testing circuit also is connected to voltage stabilizing and control circuit, and is used to connect outside LED and piles up; Said extra current testing circuit is connected between additional current-limiting circuit and voltage stabilizing and the control circuit, and whether be used for detecting has electric current to pass through, and testing result is flowed to voltage stabilizing and control circuit; Said voltage stabilizing and control circuit are controlled the electric current output of additional current-limiting circuit according to the testing result of extra current testing circuit or are closed.
3. LED drive IC according to claim 1 is characterized in that: said second current-limiting circuit is composed in series by current-limiting resistance and controllable silicon each other.
4. LED drive IC according to claim 1 is characterized in that: the D.C. regulated power supply that the inner voltage stabilizing circuit of said voltage stabilizing and control circuit provides 15V is to internal control circuit.
5. LED drive IC according to claim 1 is characterized in that: said LED drive IC comprises four groups of extra current testing circuits and additional current-limiting circuit.
6. LED drive IC according to claim 1 is characterized in that: said LED piles up by several LED and is in series.
7. LED drive IC according to claim 1 is characterized in that: the external back of the current-limiting resistance in the additional current-limiting circuit of said last group ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110391883XA CN102387643A (en) | 2011-12-01 | 2011-12-01 | LED (light emitting diode) -driven IC (integrated circuit) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110391883XA CN102387643A (en) | 2011-12-01 | 2011-12-01 | LED (light emitting diode) -driven IC (integrated circuit) |
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| Publication Number | Publication Date |
|---|---|
| CN102387643A true CN102387643A (en) | 2012-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110391883XA Pending CN102387643A (en) | 2011-12-01 | 2011-12-01 | LED (light emitting diode) -driven IC (integrated circuit) |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1760721A (en) * | 2004-10-14 | 2006-04-19 | 索尼公司 | Light emitting element drive device and display system |
| CN101668373A (en) * | 2009-09-29 | 2010-03-10 | 李云霄 | LED light source driving circuit supplied by AC power |
| CN102186282A (en) * | 2011-03-21 | 2011-09-14 | 中国航天科技集团公司第九研究院第七七一研究所 | Drive circuit capable of improving power factors of alternating current light emitting diode (AC LED) lamp |
| CN202374501U (en) * | 2011-12-01 | 2012-08-08 | 福建省万邦光电科技有限公司 | Driving integrated circuit (IC) for light-emitting diodes (LED) |
-
2011
- 2011-12-01 CN CN201110391883XA patent/CN102387643A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1760721A (en) * | 2004-10-14 | 2006-04-19 | 索尼公司 | Light emitting element drive device and display system |
| CN101668373A (en) * | 2009-09-29 | 2010-03-10 | 李云霄 | LED light source driving circuit supplied by AC power |
| CN102186282A (en) * | 2011-03-21 | 2011-09-14 | 中国航天科技集团公司第九研究院第七七一研究所 | Drive circuit capable of improving power factors of alternating current light emitting diode (AC LED) lamp |
| CN202374501U (en) * | 2011-12-01 | 2012-08-08 | 福建省万邦光电科技有限公司 | Driving integrated circuit (IC) for light-emitting diodes (LED) |
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Application publication date: 20120321 |