CN201957308U - Dimmable light emitting diode (LED) constant-current drive circuit - Google Patents
Dimmable light emitting diode (LED) constant-current drive circuit Download PDFInfo
- Publication number
- CN201957308U CN201957308U CN2011200315747U CN201120031574U CN201957308U CN 201957308 U CN201957308 U CN 201957308U CN 2011200315747 U CN2011200315747 U CN 2011200315747U CN 201120031574 U CN201120031574 U CN 201120031574U CN 201957308 U CN201957308 U CN 201957308U
- Authority
- CN
- China
- Prior art keywords
- resistance
- power supply
- led
- circuit
- current drive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to a dimmable light emitting diode (LED) constant-current drive circuit, which comprises a D trigger, a voltage comparison circuit and an LED power supply circuit, wherein the voltage comparison circuit and the LED power supply circuit are respectively connected with the D trigger, the voltage comparison circuit is connected with the preset end of the D trigger and the LED power supply circuit is connected with the output end Q of the D trigger to form a pulse width modulation (PWM) circuit which is effective to modulate high level, and the voltage comparison circuit is connected with the zero clearing end of the D trigger and the LED power supply circuit is connected with the output end Q1 of the D trigger to form a PWM circuit which is effective to modulate low level. The dimmable LED constant-current drive circuit has the advantages of high working frequency, accurate response to PWM signals, good dimming linearity and consistency, small volume, low cost, low circuit power consumption, high efficiency and high working stability.
Description
Technical field
The utility model relates to a kind of drive circuit, is specifically related to a kind of Dimmable LED constant-current drive circuit.
Background technology
Current, in short supply and national the vigorously advocating under the energy-saving and cost-reducing background in global energy, at lighting field, LED gives out light product because of characteristics such as it has energy-saving and environmental protection, the life-span is long, volume is little, luminous efficiency height, can be widely used in illumination occasions such as home lighting, road lighting, urban landscape.
The LED constant-current drive circuit of existing tunable optical uses some to carry the special-purpose LED constant-current driven chip of oscillating circuit more, these chip built-ins RC oscillating circuit, support the brightness adjustment control of external PWM signal simultaneously, because RC frequency of oscillation and external PWM signal frequency can not be mated, all there is the consistency defect of bad of pwm signal, light modulation linearity difference and the brightness adjustment control that can not respond upper frequency usually in these circuit.
The utility model content
In order to address the above problem, the utility model provides a kind of can respond the pwm signal of upper frequency and the Dimmable LED constant-current drive circuit of light modulation good linearity.
The purpose of this utility model is achieved through the following technical solutions:
A kind of Dimmable LED constant-current drive circuit comprises d type flip flop, voltage comparator circuit, LED power supply circuits, it is characterized in that, described voltage comparator circuit links to each other with described d type flip flop respectively with the LED power supply circuits.
As improvement, described voltage comparator circuit is connected to the end that presets of d type flip flop, and described LED power supply circuits are connected to the output Q end of d type flip flop.
As further improvement, described voltage comparator circuit is connected to the clear terminal of d type flip flop, and described LED power supply circuits are connected to the output of d type flip flop
End.
Preferably, the utility model circuit also comprises delay circuit, and described delay circuit comprises resistance R 1, capacitor C 1, described resistance R 1 and capacitor C 1 series connection, and the output of voltage comparator circuit is connected between resistance R 1 and the capacitor C 1.
Preferably, described voltage comparator circuit comprises voltage comparator, sampling voltage input resistance R5, adjustable reference potential circuit, described sampling voltage input resistance R5 and adjustable reference potential circuit are connected to two inputs of voltage comparator respectively, described sampling voltage input resistance R5 links to each other with the LED power supply circuits, and the output of described voltage comparator links to each other with the end that presets of d type flip flop.Wherein, described adjustable reference potential circuit comprises reference voltage V REF, resistance R 2, resistance R 4, adjustable resistance R3, described reference voltage V REF is by resistance R 2, adjustable resistance R3, resistance R 4 back ground connection, and an input of voltage comparator is connected between adjustable resistance R3 and the resistance R 4.
Preferably; described LED power supply circuits comprise dc power supply VDD; energy storage inductor L1; depletion type N channel transistor Q1; sample resistance R6; voltage stabilizing didoe D1; protective resistance R7; at least one LED lamp; described LED lamp is cascaded in parallel with protective resistance R7; it is in parallel after energy storage inductor L1 connects with voltage stabilizing didoe D1 with protective resistance R7; dc power supply VDD is connected to the drain electrode of depletion type N channel transistor Q1 by voltage stabilizing didoe D1; the source electrode of depletion type N channel transistor Q1 is by ground connection behind the sample resistance R6, and the grid of depletion type N channel transistor Q1 links to each other with the output Q of d type flip flop end.
As further improvement; described LED power supply circuits comprise dc power supply VDD; energy storage inductor L1; depletion type N channel transistor Q1; sample resistance R6; voltage stabilizing didoe D1; protective resistance R7; at least one LED lamp; described LED lamp is cascaded in parallel with protective resistance R7; it is in parallel after energy storage inductor L1 connects with voltage stabilizing didoe D1 with protective resistance R7; dc power supply VDD is connected to the drain electrode of depletion type N channel transistor Q1 by voltage stabilizing didoe D1; the source electrode of depletion type N channel transistor Q1 is by ground connection behind the sample resistance R6, the grid of depletion type N channel transistor Q1 and the output of d type flip flop
End links to each other.
The utility model compared with prior art has following advantage:
The utility model operating frequency height, the response pwm signal is accurate, light modulation linearity and high conformity, volume is little simultaneously, and cost is low, and oneself power consumption is low, efficient height, working stability.
Description of drawings
Accompanying drawing 1 is the circuit theory diagrams of a kind of Dimmable LED constant-current drive circuit of the utility model to high level modulation;
Accompanying drawing 2 is the circuit theory diagrams of a kind of Dimmable LED constant-current drive circuit of the utility model to low level modulation.
Embodiment
Below in conjunction with accompanying drawing concrete enforcement of the utility model is further described:
Accompanying drawing 1 is the circuit theory diagrams of a kind of Dimmable LED constant-current drive circuit of the utility model to high level modulation.As shown in Figure 1, sample resistance R6 by dc power supply VDD, LED string, energy storage inductor L1, depletion type N channel transistor Q1 and electric current is composed in series the LED current supply circuit, and in LED string two ends no-load protection resistance R 7 in parallel, at LED string and energy storage inductor L1 series block two ends parallel diode D1; The source electrode of depletion type N channel transistor Q1 links to each other with the negative input end of voltage comparator ic 2 by input resistance R5, by reference voltage V REF, resistance R 2, adjustable resistance R3, resistance R 4 is composed in series the adjustable reference potential circuit, the output W end of adjustable reference potential circuit links to each other with the positive input terminal of voltage comparator ic 2, the output of voltage comparator ic 2 links to each other with the end SD end that presets of d type flip flop IC1, also with by resistance R 1 link to each other simultaneously with the delay circuit that capacitor C 1 is composed in series, the output Q end of d type flip flop IC1 links to each other with the control utmost point grid of depletion type N channel transistor Q1, the CLK end of d type flip flop IC1 is as the input of external clock, and the D end of d type flip flop IC1 is as the input of external PWM signal.
The utility model uses outside pwm signal and controls with the CLK clock that pwm signal is complementary, when the LED string does not reach the continuous current restriction, voltage comparator circuit is inoperative, pwm signal is directly controlled the output state of the output Q end of d type flip flop IC1 by the CLK clock that is complementary with it, the Kai Heguan that just is equivalent to the direct oxide-semiconductor control transistors of pwm signal, control is accurately; When the LED string reaches the continuous current restriction, the LED string has also just reached the current maxima that circuit allows, at this moment voltage comparator ic 2 output output low levels are given delay circuit, the end SD that presets of delay circuit control d type flip flop holds, make the output Q end output low level of d type flip flop IC1 come switching off depletion type N channel transistor Q1, after the time-delay of delay circuit finished, the output Q of d type flip flop IC1 end began to be subjected to the control of pwm signal again, thereby reaches the accurate light modulation of PWM and two purposes of constant current.
As another embodiment of the present utility model, sampling voltage input resistance R5 and protective resistance R7 are can be no, and sampling voltage input resistance R5 can short circuit, and protective resistance R7 can connect (or not connecing) by sky.
As another embodiment of the present utility model, the delay circuit of being made up of resistance R 1 and capacitor C 1 also can replace with other delay circuit; When d type flip flop IC1 external clock CLK frequency is low, also can be without delay circuit, at this moment voltage comparator ic 2 also can replace with operational amplifier.
The utility model is suitable for low level modulation simultaneously, and as shown in Figure 2, the method for attachment of d type flip flop IC1 has some different with Fig. 1 in Fig. 2, specifically is the output Q of d type flip flop IC1 end and output
End exchanges, and presets and holds SD end and clear terminal CD end to exchange, and the modulated process of modulated process and high level shown in Figure 1 is roughly the same, repeats no more here.
For a person skilled in the art, can make other various corresponding changes and distortion, and these all changes and distortion should belong within the protection range of the utility model claim all according to technical scheme described above and design.
Claims (8)
1. a Dimmable LED constant-current drive circuit comprises d type flip flop, voltage comparator circuit, LED power supply circuits, it is characterized in that, described voltage comparator circuit links to each other with described d type flip flop respectively with the LED power supply circuits.
2. a kind of Dimmable LED constant-current drive circuit according to claim 1 is characterized in that, described voltage comparator circuit is connected to the end that presets of d type flip flop, and described LED power supply circuits are connected to the output Q end of d type flip flop.
3. a kind of Dimmable LED constant-current drive circuit according to claim 1 is characterized in that described voltage comparator circuit is connected to the clear terminal of d type flip flop, and described LED power supply circuits are connected to the output of d type flip flop
End.
4. according to claim 2 or 3 described a kind of Dimmable LED constant-current drive circuits, it is characterized in that, also comprise delay circuit, described delay circuit comprises resistance R 1, capacitor C 1, described resistance R 1 and capacitor C 1 series connection, the output of voltage comparator circuit is connected between resistance R 1 and the capacitor C 1.
5. a kind of Dimmable LED constant-current drive circuit according to claim 4, it is characterized in that, described voltage comparator circuit comprises voltage comparator, sampling voltage input resistance R5, adjustable reference potential circuit, described sampling voltage input resistance R5 and adjustable reference potential circuit are connected to two inputs of voltage comparator respectively, described sampling voltage input resistance R5 links to each other with the LED power supply circuits, and the output of described voltage comparator links to each other with d type flip flop.
6. a kind of Dimmable LED constant-current drive circuit according to claim 5, it is characterized in that, described adjustable reference potential circuit comprises reference voltage V REF, resistance R 2, resistance R 4, adjustable resistance R3, described reference voltage V REF is by resistance R 2, adjustable resistance R3, resistance R 4 back ground connection, and an input of voltage comparator is connected between adjustable resistance R3 and the resistance R 4.
7. a kind of Dimmable LED constant-current drive circuit according to claim 2; it is characterized in that; described LED power supply circuits comprise dc power supply VDD; energy storage inductor L1; depletion type N channel transistor Q1; sample resistance R6; voltage stabilizing didoe D1; protective resistance R7; at least one LED lamp; described LED lamp is cascaded in parallel with protective resistance R7; it is in parallel after energy storage inductor L1 connects with voltage stabilizing didoe D1 with protective resistance R7; dc power supply VDD is connected to the drain electrode of depletion type N channel transistor Q1 by voltage stabilizing didoe D1; the source electrode of depletion type N channel transistor Q1 is by ground connection behind the sample resistance R6, and the grid of depletion type N channel transistor Q1 links to each other with the output Q of d type flip flop end.
8. a kind of Dimmable LED constant-current drive circuit according to claim 3; it is characterized in that; described LED power supply circuits comprise dc power supply VDD; energy storage inductor L1; depletion type N channel transistor Q1; sample resistance R6; voltage stabilizing didoe D1; protective resistance R7; at least one LED lamp; described LED lamp is cascaded in parallel with protective resistance R7; it is in parallel after energy storage inductor L1 connects with voltage stabilizing didoe D1 with protective resistance R7; dc power supply VDD is connected to the drain electrode of depletion type N channel transistor Q1 by voltage stabilizing didoe D1; the source electrode of depletion type N channel transistor Q1 is by ground connection behind the sample resistance R6, the grid of depletion type N channel transistor Q1 and the output of d type flip flop
End links to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200315747U CN201957308U (en) | 2011-01-28 | 2011-01-28 | Dimmable light emitting diode (LED) constant-current drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200315747U CN201957308U (en) | 2011-01-28 | 2011-01-28 | Dimmable light emitting diode (LED) constant-current drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201957308U true CN201957308U (en) | 2011-08-31 |
Family
ID=44501409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200315747U Expired - Fee Related CN201957308U (en) | 2011-01-28 | 2011-01-28 | Dimmable light emitting diode (LED) constant-current drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201957308U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104470114A (en) * | 2014-12-01 | 2015-03-25 | 苏州立瓷电子技术有限公司 | Power supply circuit of LED lamp thermal resistance measurement system |
| CN107635322A (en) * | 2017-10-27 | 2018-01-26 | 国网山东省电力公司商河县供电公司 | A kind of Dimmable LED constant-current drive circuit |
| CN110430642A (en) * | 2013-08-09 | 2019-11-08 | 意法半导体研发(深圳)有限公司 | Driving device and its method for luminaire |
-
2011
- 2011-01-28 CN CN2011200315747U patent/CN201957308U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110430642A (en) * | 2013-08-09 | 2019-11-08 | 意法半导体研发(深圳)有限公司 | Driving device and its method for luminaire |
| CN110430642B (en) * | 2013-08-09 | 2023-11-14 | 意法半导体研发(深圳)有限公司 | Driving device for light emitting apparatus and method thereof |
| CN104470114A (en) * | 2014-12-01 | 2015-03-25 | 苏州立瓷电子技术有限公司 | Power supply circuit of LED lamp thermal resistance measurement system |
| CN107635322A (en) * | 2017-10-27 | 2018-01-26 | 国网山东省电力公司商河县供电公司 | A kind of Dimmable LED constant-current drive circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101835317B (en) | Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function | |
| CN201063902Y (en) | LED driving power supply | |
| CN205596389U (en) | Constant current AC drive circuit and TV set | |
| CN103354685A (en) | LED driving chip | |
| CN204465954U (en) | A kind of LED lamp drive circuit with dimming function | |
| CN201957308U (en) | Dimmable light emitting diode (LED) constant-current drive circuit | |
| CN104010405B (en) | A kind of LED light adjusting circuit | |
| CN102510605B (en) | Novel LED (light emitting diode) driving circuit and drive method | |
| CN203136261U (en) | LED light modulation circuit | |
| CN202738171U (en) | Light-adjustable LED drive circuit | |
| CN202551459U (en) | LED (Light Emitting Diode) driving power supply module for silicon controlled regulating circuit | |
| CN204031528U (en) | A kind of energy-conservation driving circuit of high-power LED lamp | |
| CN203872387U (en) | Power off non-stroboscopic second gear dimmable LED driving power supply | |
| CN203086806U (en) | A light adjusting circuit of a fluorescent lamp | |
| CN202435701U (en) | Automatic controller for electrodeless lamp serving as streetlamp | |
| CN204465952U (en) | A kind of LED energy-saving circuit based on MSP430 | |
| CN203378104U (en) | Light modulation circuit | |
| CN203814005U (en) | LED light modulation circuit with power-on trigger lock memory function | |
| CN203596940U (en) | LED constant current source driver having power factor correction function | |
| CN207911069U (en) | Constant current output high pressure dimming driver | |
| CN201774729U (en) | Two-stage dimming electrodeless lamp circuit capable of automatically switching at regular time | |
| CN206042452U (en) | LED power supply system | |
| CN204408691U (en) | A kind of LED power charge/discharge control circuit | |
| CN103338545A (en) | Fluorescent lamp dimming circuit and operating method thereof | |
| CN204859676U (en) | LED drive arrangement |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110831 Termination date: 20180128 |