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LED driver based on Sepic soft switching and hybrid driving method thereof

A technology of LED driver and hybrid drive, which is applied in the direction of instruments, electric variable adjustment, high-efficiency power electronic conversion, etc. It can solve problems affecting LED efficiency, brightness life, etc., and achieve the effect of reducing loss and constant output current

Active Publication Date: 2020-02-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest problem facing LEDs in the market today is the design of their drive circuits. The quality of the drive circuit will largely affect the efficiency, brightness and lifespan of LEDs.

Method used

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  • LED driver based on Sepic soft switching and hybrid driving method thereof
  • LED driver based on Sepic soft switching and hybrid driving method thereof
  • LED driver based on Sepic soft switching and hybrid driving method thereof

Examples

Experimental program
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Effect test

specific Embodiment 1

[0040] according to figure 1 As shown, the present invention provides a Sepic soft-switching LED driver. The driver includes: a sampling circuit, a control chip, a driving circuit, a boost unit I, a boost unit II, and a voltage source V in , Inductance L 1 , Switch tube Q 1 , Capacitance C P , Diode D P , Capacitance C s , Inductance L 3 , Diode D o , Output capacitor C o , Sampling resistor R ref And diode R L ;

[0041] The boost unit II includes a switch tube Q 2 , Capacitance C Q , Diode D Q And inductance L 2 , Capacitance C Q And diode D Q Parallel to switch Q 2 Both ends of the booster unit I includes a diode D M And capacitance C M ;

[0042] Voltage source V in The positive terminal is connected to the inductance L 1 One end, inductance L 1 Connect the capacitor C to the other end s And switch Q 1 One end, capacitance C s Connect diode D to the other end o And inductance L 3 One end, diode D o The other end is connected to the output capacitor C o And diode R L One end, di...

specific Embodiment 3

[0093] The input and output parameters of the converter used in the present invention under full load are: 12VVin, 120V Vout, output current 300mA, and rated switching frequency of 1MHz. From this, the drive and voltage waveforms of the switch tube under full load are obtained as Figure 7 As shown, the output voltage and current at full load are Figure 8 Shown, according to Picture 9 Under 90% load, the corresponding switch tube drive, voltage at both ends and output voltage waveform are shown. When the final load changes in the range of 100% to 75%, the dynamic waveform of the output voltage and current changes is as follows: Picture 10 Shown.

[0094] Calculate according to the specific parameters of the circuit and get Image 6 The corresponding switching frequency and duty cycle change curve under different loads in the medium, and the corresponding PWM+PFM control program is written to realize closed-loop control.

[0095] For the 1MHz high frequency DC / DC converter, the dr...

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PUM

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Abstract

The invention relates to an LED driver based on Sepic soft switching and a hybrid driving method thereof. The driver comprises a sampling circuit, a control chip, a driving circuit, a boosting unit I,a boosting unit II, a voltage source Vin, an inductor L1, a switching tube Q1, a capacitor CP, a diode DP, a capacitor Cs, an inductor L3, a diode Do, an output capacitor Co, a sampling resistor Rrefand a diode RL. The PWM + PFM hybrid control method is designed for the LED driver with the dimming function, it can be guaranteed that the output current is constant when the load changes, the mainswitching tube is in a soft switching state all the time, and the loss of the system under high-frequency work is reduced.

Description

Technical field [0001] The invention relates to the technical field of LED drivers, and is a Sepic soft switch LED driver and a hybrid driving method thereof. Background technique [0002] With the development and progress of the global economy, energy issues have become the lifeblood of every country's development. The pollution problems caused by traditional fossil energy and the increasing depletion of non-renewable resources on the earth have put forward severe requirements for the development of new green and renewable energy. Light Emitting Diode (LED), as the fourth-generation new green light source, has the characteristics of energy saving, environmental protection, safety, long life, and low power consumption. It can be used in various indications, decorations, backlights, general lighting and other fields. The biggest problem facing LEDs in the current market is the design of their drive circuits. The quality of the drive circuit will largely affect the efficiency, bri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B45/38H05B45/325H05B45/335H05B45/345H02M3/158
CPCH02M3/158H02M1/0058Y02B70/10
Inventor 王懿杰高珊珊刘怡宁管乐诗姚友素张相军徐殿国
Owner HARBIN INST OF TECH
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