Blue-ray LED driving system with adjustable brightness

A LED drive and blue light technology, applied in the field of electronic energy saving, can solve the problems of poor anti-electromagnetic interference ability, unstable driving, poor brightness adjustment accuracy, etc., to improve load capacity, improve anti-electromagnetic interference ability, and ensure stability Effect

Inactive Publication Date: 2016-09-07
CHENGDU JIESHENG TECH CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of poor anti-electromagnetic interference, unstable driving, and po...
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Abstract

The invention discloses a blue-ray LED driving system with adjustable brightness, characterized by mainly comprising a control chip U, and a light adjustment control circuit, a reference correction circuit, a slope compensation circuit and a logic buffer circuit which are connected with the control chip U; the reference correction circuit is connected with the logic buffer circuit; and the light adjustment circuit is connected with the logic buffer circuit. The system provided by the invention can eliminate or attenuate external electromagnetic interference, and locks voltage and current for limitation, thus the voltage and current keep steady; and when in actual use, the anti-electromagnetic interference capability of the system is improved by more than 1.5 times over the existing driving system, can output stable driving current, meanwhile can accurately adjust the brightness of an LED light, and can effectively ensure the stability of the brightness of the blue-ray LED light. Meanwhile, the load capacity of the system provided by the invention can be effectively enhanced.

Application Domain

Electrical apparatusElectroluminescent light sources

Technology Topic

Electromagnetic interferenceEngineering +6

Image

  • Blue-ray LED driving system with adjustable brightness
  • Blue-ray LED driving system with adjustable brightness

Examples

  • Experimental program(1)

Example Embodiment

[0021] Example
[0022] like figure 1 As shown, the present invention is mainly composed of a control chip U, a dimming control circuit, a reference correction circuit, a slope compensation circuit, and a logic buffer circuit. The reference correction circuit consists of a triode VT1, a triode VT2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a polar capacitor C1, a polar capacitor C2, a polar capacitor C3, an inductor L, a diode D1, and a diode D2 composition.
[0023] When connected, the P pole of the diode D2 is connected to the base of the transistor VT1, and the N pole is connected to the base of the transistor VT2. The P pole of the diode D1 is connected to the collector of the transistor VT1, and the N pole is connected to the base of the transistor VT2 through the resistor R2 and the resistor R1 in sequence. The positive pole of the polar capacitor C1 is connected to the base of the triode VT2 through the inductor L, and the negative pole is connected to the N pole of the diode D1. The positive pole of the polar capacitor C2 is connected to the base of the triode VT2 via the resistor R3, and the negative pole is connected to the emitter of the triode VT1 via the resistor R4. The positive pole of the polar capacitor C3 is connected to the collector of the triode VT2 through the resistor R5, and the negative pole is connected to the GND pin of the control chip U and then grounded.
[0024] The collector of the triode VT1 is grounded; the anode of the polar capacitor C1 and the N pole of the diode D1 together form the input end of the reference calibration circuit; the emitter of the triode VT2 is used as the output end of the reference calibration circuit and is connected with the logic buffer. circuit connected.
[0025] Further, the slope compensation circuit is composed of a transistor VT3, a resistor R13, a resistor R14, an adjustable resistor R15, a resistor R16, a polar capacitor C6, and a polar capacitor C7.
[0026] When connected, the negative electrode of the polar capacitor C6 is connected to the LD pin of the control chip U, and the positive electrode is connected to the base electrode of the triode VT3. The positive pole of the polar capacitor C7 is connected to the emitter of the triode VT3 through the resistor R16, and the negative pole is connected to the RL pin of the control chip U through the resistor R14 and the resistor R13 in sequence. One end of the adjustable resistor R15 is connected to the collector of the triode VT3, and the other end is connected to the negative electrode of the polar capacitor C7 and then grounded.
[0027] Meanwhile, the logic buffer circuit consists of MOSFET MOS1, MOSFET MOS2, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R12, polar capacitor C4, polar capacitor C5, Voltage diode D3, diode D4, and diode D5 are formed.
[0028] When connected, the P pole of the diode D5 is connected to the CS pin of the control chip U through the resistor R12 and the resistor R11 in sequence, and the N pole is connected to the source of the field effect transistor MOS2. One end of the resistor R10 is connected to the negative electrode of the polar capacitor C10, and the other end is connected to the gate of the field effect transistor MOS2. The N pole of the diode D4 is connected to the source of the field effect transistor MOS1, and the P pole is connected to the VIN pin of the control chip U through the resistor R9.
[0029] The negative electrode of the polar capacitor C5 is connected to the drain of the field effect transistor MOS2, and the positive electrode is connected to the drain of the field effect transistor MOS2 through the resistor R8. One end of the resistor R6 is connected to the drain of the field effect transistor MOS1, and the other end is connected to the emitter of the triode VT2. The positive pole of the polar capacitor C4 is connected to the gate of the field effect transistor MOS1 through the resistor R7, and the negative pole is grounded. The P pole of the diode D3 is connected to the negative pole of the polar capacitor C4, and the N pole is connected to the emitter of the triode VT2.
[0030] The N pole of the diode D3 is connected to the positive pole of the polar capacitor C4; the source of the field effect transistor MOS2 is connected to the emitter of the triode VT5, and its drain and the positive pole of the polar capacitor C5 form a logic buffer circuit together The output terminal and connected with the LED light group.
[0031] like figure 2 As shown, the dimming control circuit consists of amplifier P, transistor VT4, transistor VT5, resistor R17, resistor R18, resistor R19, resistor R20, resistor R21, resistor R22, adjustable resistor R23, resistor R24, resistor R25, adjustable Resistor R26, resistor R27, polar capacitor C8, polar capacitor C9, polar capacitor C10, diode D6, diode D7, diode D8, and diode D9.
[0032] When connected, one end of the resistor R17 is connected to the positive input end of the amplifier P, and the other end is connected to the GATE pin of the control chip U as the input end of the dimming control circuit. The positive pole of the polar capacitor C9 is connected to the negative input terminal of the amplifier P through the resistor R19, and the negative pole is connected to the PWM pin of the control chip U. The negative electrode of the polar capacitor C10 is connected to the collector of the triode VT4 through the resistor R25, and the positive electrode and the emitter of the triode VT5 together form the output end of the dimming control circuit and are connected to the logic buffer circuit.
[0033] The N pole of the diode D7 is connected to the positive pole of the polar capacitor C10 through the adjustable resistor R23 and the resistor R24 ​​in sequence, and the P pole is connected to the output end of the amplifier P. The N pole of the diode D8 is connected to the base of the triode VT4, and the P pole is connected to the output end of the amplifier P through the resistor R22. The negative pole of the polar capacitor C8 is connected to the control terminal of the adjustable resistor R23 via the resistor R20, and the positive pole is connected to the positive input terminal of the amplifier P via the resistor R18.
[0034] At the same time, the N pole of the diode D9 is connected to the negative pole of the polar capacitor C10 through the resistor R27, and the P pole is connected to the collector of the triode VT5. The N pole of the diode D6 is connected to the emitter of the triode VT5 through the resistor R21 and the adjustable resistor R26 in sequence, and the P pole is connected to the positive input end of the amplifier P. The emitter of the triode VT4 is connected to the base of the triode VT5.
[0035] During operation, the present invention can eliminate or attenuate external electromagnetic interference, and lock and limit the voltage and current, so as to keep the voltage and current stable. The electromagnetic interference capability has been improved by more than 1.5 times, and it can also output a stable driving current, effectively ensuring the stability of the brightness of the blue LED lamp. The invention can accurately adjust the brightness of the LED lamp, so that the use effect of the LED lamp is better, and the LED lamp can be used in different environments. At the same time, the present invention can effectively improve the load capacity, so as to drive more LED lamp groups at the same time, and can effectively prolong the service life of the LEDs to meet people's needs. In order to better implement the present invention, the control chip U is preferably realized by an integrated chip of AX9021 with high sensitivity.

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