CN105407600A - Boosting LED driving circuit based on PWM control - Google Patents
Boosting LED driving circuit based on PWM control Download PDFInfo
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- CN105407600A CN105407600A CN201510805612.2A CN201510805612A CN105407600A CN 105407600 A CN105407600 A CN 105407600A CN 201510805612 A CN201510805612 A CN 201510805612A CN 105407600 A CN105407600 A CN 105407600A
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- 238000005070 sampling Methods 0.000 claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention discloses a boosting LED (Light Emitting Diode) driving circuit based on PWM (Pulse Width Modulation) control. The driving circuit also comprises a protection module; and an NMSO tube can be protected in multiaspect, so that the use duration of LEDs is prolonged. A current control feedback loop module is arranged on the sampling module; and the current and the voltage can be controlled and regulated at the same time, so that the efficiency of the driving circuit can be improved. The precision value of a PWM comparator module and the recognition voltage show that the PWM comparator module has high precision and high recognition capability, and the application value is very high.
Description
Technical field
The present invention relates to and belong to LED circuit field, be specifically related to a kind of boosting LED drive circuit controlled based on PWM.
Background technology
LED is made up of a PN junction, and when forward bias voltage is greater than cut-in voltage, produce spontaneous radiation fluorescence, emittance is stronger, and the wavelength launched is shorter, otherwise then wavelength is longer.As now widely used backlight, the advantage of LED is also suitable obvious, and the harmful substances such as main advantage has: (1) environmental protection: adopt semiconductor technology luminous, not mercurous meet current whole world ecological requirements; (2) low-power consumption, more than 100lm/W luminous efficiency, power consumption can reduce by more than 30%.Adopt dynamic local light regulating technology, power consumption can be reduced further; (3) long-life: working life reaches 100,000 hours.(4) good optical properties, good colour gamut and contrast; (4) fail safe is high: the driving voltage only needing more than 3V, fast response and settling time; (5) sturdy and durable: to adopt solidification encapsulation, vibration resistance.Current LED constant current backlight drive circuit also exists poor stability and inefficient problem.
Summary of the invention
The object of the present invention is to provide a kind of boosting LED drive circuit controlled based on PWM.
For achieving the above object, the invention provides following technical scheme: a kind of boosting LED drive circuit controlled based on PWM, described drive circuit comprises sampling module, amplifier module, voltage reference source module, PWM comparator module and light-adjusting module, described sampling module is connected with amplifier module, by sampling to flowing through NMSO tube current, described voltage reference source module is connected with amplifier module, described voltage reference source module be one not by the reference voltage that ambient temperature and supply power voltage affect, more then difference signal amplifies with reference voltage by described amplifier module by the voltage of input, described PWM comparator module is connected with amplifier module, difference signal is output into different square-wave signals by described PWM module, described light-adjusting module is connected with PWM module, described light-adjusting module is by the difference of duty cycle square wave, obtain the LED of different brightness.
Preferably, described drive circuit also comprises protection module, and described protection module is connected with NMSO pipe.
Preferably, described protection module includes over-and under-voltage protection, output over-voltage protection, output overcurrent protection.
Preferably, described sampling module is provided with current control feedback ring module, coating-forming voltage, double current loop modulation system.
Preferably, the precision of described PWM comparator module is 1-3mV, and gain is 1700-5000, and output voltage settling time of system is 100us.
Preferably, described PWM comparator module is when supply voltage is 5V, and exporting the minimum voltage that can identify is 5mV.
The beneficial effect of above technical scheme is adopted to be: to the invention provides a kind of boosting LED drive circuit controlled based on PWM, described drive circuit also comprises protection module, many-sided protection can be carried out to NMSO pipe, thus extend the use duration of LED, described sampling module is provided with current control feedback ring module, regulating and controlling can be carried out to electric current and voltage simultaneously, thus the efficiency of drive circuit can be improved, accuracy value and the identification voltage of described PWM comparator module illustrate that PWM comparator module has higher precision and recognition capability, there is very high using value.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of embodiments of the invention.
Fig. 2 is the circuit diagram of PWM comparator module.
Embodiment
The technological means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.
embodiment:
A kind of boosting LED drive circuit controlled based on PWM, described drive circuit comprises sampling module, amplifier module, voltage reference source module, PWM comparator module and light-adjusting module, described sampling module is connected with amplifier module, by sampling to flowing through NMSO tube current, described voltage reference source module is connected with amplifier module, described voltage reference source module be one not by the reference voltage that ambient temperature and supply power voltage affect, more then difference signal amplifies with reference voltage by described amplifier module by the voltage of input, described PWM comparator module is connected with amplifier module, difference signal is output into different square-wave signals by described PWM module, described light-adjusting module is connected with PWM module, described light-adjusting module is by the difference of duty cycle square wave, obtain the LED of different brightness.
Described drive circuit also comprises protection module; described protection module is connected with NMSO pipe; described protection module includes over-and under-voltage protection, output over-voltage protection, output overcurrent protection; described sampling module is provided with current control feedback ring module; coating-forming voltage, double current loop modulation system; the precision of described PWM comparator module is 1-3mV; gain is 1700-5000; output voltage settling time of system is 100us; described PWM comparator module is when supply voltage is 5V, and exporting the minimum voltage that can identify is 5mV.
The operation principle of PWM comparator module: negative terminal input signal is the sawtooth signal V provided by oscillator
ramp, anode input signal is the V provided by output sampling resistor
out_eamp
。Work as V
rampbe less than V
out_eamptime, according to the output character of comparator, V
outexport high level, now switching tube is opened, rectifying tube close, power supply to induction charging, V
rampbe increased over V
out_eamptime, V
outoutput low level, now switching tube is closed, and rectifying tube is opened, and inductance transmits energy to output capacitance and load.
The invention provides a kind of boosting LED drive circuit controlled based on PWM; described drive circuit also comprises protection module; many-sided protection can be carried out to NMSO pipe; thus extend the use duration of LED; described sampling module is provided with current control feedback ring module; regulating and controlling can be carried out to electric current and voltage simultaneously; thus the efficiency of drive circuit can be improved; accuracy value and the identification voltage of described PWM comparator module illustrate that PWM comparator module has higher precision and recognition capability, have very high using value.
As known by the technical knowledge, the present invention can be realized by other the embodiment not departing from its Spirit Essence or essential feature.Therefore, above-mentioned disclosed embodiment, with regard to each side, all just illustrates, is not only.Within the scope of the present invention all or be all included in the invention being equal to the change in scope of the present invention.
Claims (6)
1. the boosting LED drive circuit controlled based on PWM, it is characterized in that, described drive circuit comprises sampling module, amplifier module, voltage reference source module, PWM comparator module and light-adjusting module, described sampling module is connected with amplifier module, by sampling to flowing through NMSO tube current, described voltage reference source module is connected with amplifier module, described voltage reference source module be one not by the reference voltage that ambient temperature and supply power voltage affect, more then difference signal amplifies with reference voltage by described amplifier module by the voltage of input, described PWM comparator module is connected with amplifier module, difference signal is output into different square-wave signals by described PWM module, described light-adjusting module is connected with PWM module, described light-adjusting module is by the difference of duty cycle square wave, obtain the LED of different brightness.
2. a kind of boosting LED drive circuit controlled based on PWM according to claim 1, it is characterized in that: described drive circuit also comprises protection module, described protection module is connected with NMSO pipe.
3. a kind of boosting LED drive circuit controlled based on PWM according to claim 2, is characterized in that: described protection module includes over-and under-voltage protection, output over-voltage protection, output overcurrent protection.
4. a kind of boosting LED drive circuit controlled based on PWM according to claim 1, is characterized in that: described sampling module is provided with current control feedback ring module, coating-forming voltage, double current loop modulation system.
5. according to claim 1 a kind of boosting LED drive circuit controlled based on PWM, it is characterized in that: the precision of described PWM comparator module is 1-3mV, and gain is 1700-5000, output voltage settling time of system is 100us.
6. a kind of boosting LED drive circuit controlled based on PWM according to claim 1, is characterized in that: described PWM comparator module is when supply voltage is 5V, and exporting the minimum voltage that can identify is 5mV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510805612.2A CN105407600A (en) | 2015-11-20 | 2015-11-20 | Boosting LED driving circuit based on PWM control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510805612.2A CN105407600A (en) | 2015-11-20 | 2015-11-20 | Boosting LED driving circuit based on PWM control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105407600A true CN105407600A (en) | 2016-03-16 |
Family
ID=55472775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510805612.2A Pending CN105407600A (en) | 2015-11-20 | 2015-11-20 | Boosting LED driving circuit based on PWM control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105407600A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090027022A1 (en) * | 2007-07-26 | 2009-01-29 | Rohm Co., Ltd | Charge pump circuit, and control circuit and control method thereof |
-
2015
- 2015-11-20 CN CN201510805612.2A patent/CN105407600A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090027022A1 (en) * | 2007-07-26 | 2009-01-29 | Rohm Co., Ltd | Charge pump circuit, and control circuit and control method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 高猛: "基于PWM控制的升压型LED驱动电路设计", 《中国优秀硕士学位论文全文数据库》 * |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160316 |
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| RJ01 | Rejection of invention patent application after publication |