CN202949595U - Light-emitting diode (LED) driving circuit - Google Patents
Light-emitting diode (LED) driving circuit Download PDFInfo
- Publication number
- CN202949595U CN202949595U CN2012205442438U CN201220544243U CN202949595U CN 202949595 U CN202949595 U CN 202949595U CN 2012205442438 U CN2012205442438 U CN 2012205442438U CN 201220544243 U CN201220544243 U CN 201220544243U CN 202949595 U CN202949595 U CN 202949595U
- Authority
- CN
- China
- Prior art keywords
- led
- drive circuit
- pulse width
- resistance
- led 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Landscapes
- Led Devices (AREA)
Abstract
The utility model relates to the technical field of voltage conversion circuits and particularly relates to a light-emitting diode (LED) driving circuit which comprises an inductor L1, a switching tube Q1, a diode D1, a capacitor C1, a resistor R1, a pulse-width modulation chip and an LED, one end of the L1 is connected with a voltage input end, the other end of the L1 is connected with a drain electrode of the Q1 and a positive electrode of the D1, a negative electrode of the D1 is connected with one end of the C1 and one end of the LED, the other end of the C1 is connected with a source electrode and a power ground of the Q1, the other end of the LED is connected with one end of the R1 and the feedback signal input end of a pulse width modulation chip, the other end of the R1 is connected with the power ground, and a driving output end of the pulse width modulation chip is connected with a grid electrode of the Q1. The LED driving circuit further comprises an adjustable resistor R2 in parallel connection with the LED, the adjustable resistor R2 enables the pulse width modulation chip to measure current of the LED and voltage at two ends of the LED, circuit compensation is performed automatically in real time according to the voltage so as to enable the LED to maintain in a set brightness range.
Description
Technical field
The utility model relates to the voltage conversion circuit technical field, relates in particular to a kind of LED drive circuit.
Background technology
existing a kind of LED drive circuit comprises inductance L 1, switching tube Q1, diode D1, capacitor C 1, LED, resistance R 1 and pulse width modulating chip (PWM IC), the end of L1 is connected with voltage input end, the other end of L1 and the drain electrode of Q1, the positive pole of D1 connects, the end of the negative pole of D1 and C1, the end of LED connects, the other end of C1 and the source electrode of Q1, power supply ground connects, the other end of LED is connected feedback signal input (the 3rd pin) and is connected with pulse width modulating chip with R1, the R1 other end and power supply ground, the earth terminal of pulse width modulating chip (the 6th pin) connects, the drive output of pulse width modulating chip (the 5th pin) is connected grid and is connected with Q1, pulse width modulating chip is brought in by driver output and is controlled above-mentioned components and parts, make circuit provide required output voltage for load LED.
The shortcoming of above-mentioned LED drive circuit be LED can be along with the prolongation of service time brightness deterioration, but the pulse width modulating chip of above-mentioned LED drive circuit only can be taken a sample to the electric current of LED, the voltage at uncontrollable LED two ends, and pulse width modulating chip can not carry out circuit compensation automatically when LED lamp luminance shortage.
Summary of the invention
The purpose of this utility model is to overcome shortcoming and defect of the prior art, but a kind of LED drive circuit of auto-compensation is provided.
to achieve these goals, the utility model adopts following technical scheme: a kind of LED drive circuit, comprise inductance L 1, switching tube Q1, diode D1, capacitor C 1, resistance R 1, pulse width modulating chip and LED, the end of L1 is connected with voltage input end, the other end of L1 and the drain electrode of Q1, the positive pole of D1 connects, the end of the negative pole of D1 and C1, the end of LED connects, the other end of C1 and the source electrode of Q1, power supply ground connects, the other end of LED and the end of R1 are connected the feedback signal input and are connected with pulse width modulating chip, the other end of R1 is connected with power supply ground, the drive output of pulse width modulating chip is connected grid and is connected with Q1, also comprise the adjustable resistance R2 in parallel with LED, the end of R2 connects the negative pole of D1, the other end of R2 connects the end of R1.
Wherein, also comprise resistance R 3, the end of R3 is connected with the other end of R2, and the other end of R3 is connected with the end of R1.
Wherein, also comprise resistance R 4, the end of R4 is connected with the other end of R3, the other end ground connection of R4.
Wherein, described R3 and R4 are the resistance that resistance is 1K Ω.
Wherein, described pulse width modulating chip is OB3370N IC.
Wherein, described switching tube is the AP9977GH metal-oxide-semiconductor.
Wherein, described diode D1 is the SB560 diode.
Wherein, described capacitor C 1 is 47uF electric capacity or 63uF electric capacity or 100uF electric capacity.
Wherein, described R1 is 10 Ω resistance.
Wherein, described R2 is 100K Ω adjustable resistance.
The beneficial effects of the utility model are: on the basis of existing LED drive circuit, it is in parallel with LED that the utility model has designed adjustable resistance R2, make pulse width modulating chip not only can record the electric current of the LED that flows through, also can record the LED both end voltage, and automatically carry out in real time circuit compensation according to voltage, make LED maintain the brightness range of a setting.
Description of drawings
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Referring to Fig. 1, below in conjunction with accompanying drawing, the utility model is described in detail.
LED drive circuit of the present utility model, comprise inductance L 1, switching tube Q1, diode D1, capacitor C 1, resistance R 1, pulse width modulating chip and LED, the end of L1 is connected with voltage input end, the other end of L1 and the drain electrode of Q1, the positive pole of D1 connects, the end of the negative pole of D1 and C1, the end of LED connects, the other end of C1 and the earth terminal of pulse width modulating chip (the 6th pin), the source electrode of Q1, power supply ground connects, the other end of LED and the end of R1 are connected feedback signal input (the 3rd pin) and are connected with pulse width modulating chip, the other end of R1 is connected with power supply ground, the drive output of pulse width modulating chip (the 5th pin) is connected grid and is connected with Q1, also comprise the adjustable resistance R2 in parallel with LED, the end of R2 connects the negative pole of D1, the other end of R2 connects the end of R1.
Adjustable resistance R2 is in parallel with LED, makes pulse width modulating chip not only can record the electric current of the LED that flows through, also can record the voltage at LED two ends, and automatically carries out in real time circuit compensation according to voltage, makes LED maintain the brightness range of a setting.
For improving stability and the precision of R2 regulating effect, the utility model also comprises resistance R 3, and the end of R3 is connected with the other end of R2, and the other end of R3 is connected with the end of R1.Also comprise resistance R 4, the end of R4 is connected with the other end of R3, the other end ground connection of R4.Wherein, described R3 and R4 are the resistance that resistance is 1K Ω.
Pulse width modulating chip is OB3370N IC.Switching tube is the AP9977GH metal-oxide-semiconductor.Diode D1 is the SB560 diode.Capacitor C 1 is 47uF electric capacity or 63uF electric capacity or 100uF electric capacity.R1 is 10 Ω resistance.R2 is 100K Ω adjustable resistance.
Pulse width modulating chip also has typical peripheral circuit, does not draw in Fig. 1, and it is known technology, does not repeat them here.The innovative point of the technical program is also to be provided with the adjustable resistance R2 with the LED parallel connection.
Above content is only preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (10)
1. LED drive circuit, comprise inductance L 1, switching tube Q1, diode D1, capacitor C 1, resistance R 1, pulse width modulating chip and LED, the end of L1 is connected with voltage input end, the other end of L1 and the drain electrode of Q1, the positive pole of D1 connects, the end of the negative pole of D1 and C1, the end of LED connects, the other end of C1 and the source electrode of Q1, power supply ground connects, the other end of LED and the end of R1 are connected the feedback signal input and are connected with pulse width modulating chip, the other end of R1 is connected with power supply ground, the drive output of pulse width modulating chip is connected grid and is connected with Q1, it is characterized in that: also comprise the adjustable resistance R2 in parallel with LED, the end of R2 connects the negative pole of D1, the other end of R2 connects the end of R1.
2. a kind of LED drive circuit according to claim 1, it is characterized in that: also comprise resistance R 3, the end of R3 is connected with the other end of R2, and the other end of R3 is connected with the end of R1.
3. a kind of LED drive circuit according to claim 2, it is characterized in that: also comprise resistance R 4, the end of R4 is connected with the other end of R3, the other end ground connection of R4.
4. a kind of LED drive circuit according to claim 3, it is characterized in that: described R3 and R4 are the resistance that resistance is 1K Ω.
5. a kind of LED drive circuit according to claim 1, it is characterized in that: described pulse width modulating chip is OB3370N IC.
6. a kind of LED drive circuit according to claim 1, it is characterized in that: described switching tube is the AP9977GH metal-oxide-semiconductor.
7. a kind of LED drive circuit according to claim 1, it is characterized in that: described diode D1 is the SB560 diode.
8. a kind of LED drive circuit according to claim 1 is characterized in that: described capacitor C 1 is 47uF electric capacity or 63uF electric capacity or 100uF electric capacity.
9. a kind of LED drive circuit according to claim 1, it is characterized in that: described R1 is 10 Ω resistance.
10. a kind of LED drive circuit according to claim 1, it is characterized in that: described R2 is 100K Ω adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205442438U CN202949595U (en) | 2012-10-23 | 2012-10-23 | Light-emitting diode (LED) driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205442438U CN202949595U (en) | 2012-10-23 | 2012-10-23 | Light-emitting diode (LED) driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202949595U true CN202949595U (en) | 2013-05-22 |
Family
ID=48425272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012205442438U Expired - Fee Related CN202949595U (en) | 2012-10-23 | 2012-10-23 | Light-emitting diode (LED) driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202949595U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104994658A (en) * | 2015-07-20 | 2015-10-21 | 苏州新里程电控系统有限公司 | An elevator LED lamp panel constant current control circuit |
| CN109246904A (en) * | 2018-09-14 | 2019-01-18 | 厦门天力源光电科技有限公司 | A kind of light-adjusting and speed-adjusting circuit |
-
2012
- 2012-10-23 CN CN2012205442438U patent/CN202949595U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104994658A (en) * | 2015-07-20 | 2015-10-21 | 苏州新里程电控系统有限公司 | An elevator LED lamp panel constant current control circuit |
| CN109246904A (en) * | 2018-09-14 | 2019-01-18 | 厦门天力源光电科技有限公司 | A kind of light-adjusting and speed-adjusting circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204119593U (en) | Realize the single channel BOOST constant-current drive circuit that two-way LED drives | |
| CN201917839U (en) | Automatic maintaining voltage adjusting circuit for PDP (Plasma Display Panel) display screen | |
| CN203984724U (en) | LED constant-current drive circuit, Switching Power Supply and lighting apparatus | |
| CN201928486U (en) | Pulse width modulation (PWM) dimming light-emitting diode (LED) driving circuit | |
| CN202949595U (en) | Light-emitting diode (LED) driving circuit | |
| CN104393755A (en) | High-efficiency booster circuit | |
| CN104023445A (en) | LED driving circuit | |
| CN202663614U (en) | Low-power light emitting diode (LED) constant-current power supply | |
| CN205017644U (en) | LED dimmer circuit device | |
| CN203645895U (en) | Load sampling circuit of non-isolated LED driving circuit | |
| CN204014207U (en) | Non-isolation type LED constant-current driven chip circuit | |
| CN204104190U (en) | LED drive power and LED display | |
| CN103531147A (en) | LED driving circuit and LED driving system employing driving circuit | |
| CN204795768U (en) | LED constant -current drive circuit | |
| CN201718084U (en) | Circuit for driving LED to emit light and LED light-emitting device | |
| CN205160369U (en) | Power step -down control circuit | |
| CN204205950U (en) | high efficiency booster circuit | |
| CN203423625U (en) | Pulse transformer coupling parallel switch mode LED display voltage stabilizing circuit | |
| CN204794686U (en) | Novel resistance -capacitance formula power supply height voltage conversion circuit | |
| CN103517521B (en) | A kind of LED high-voltage drives backlight circuit and high drive back light apparatus | |
| CN203590541U (en) | LED driving circuit and LED driving system using same | |
| CN204119573U (en) | 5w led drive circuit | |
| CN203435203U (en) | LED driving circuit | |
| CN203942666U (en) | A kind of field-effect transistor step-down LED drive circuit with power correction | |
| CN203278649U (en) | BOOST boosted circuit |
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 |
Granted publication date: 20130522 Termination date: 20151023 |
|
| EXPY | Termination of patent right or utility model |