Design of High-Power LED Drive Circuit with Economical High Power Factor Based on NCP1200

2014 ◽  
Vol 556-562 ◽  
pp. 1806-1810 ◽  
Author(s):  
Long Teng Wang ◽  
Yong Gao Jin
Keyword(s):  
Power Factor ◽  
High Power ◽  
Low Cost ◽  
Current Drive ◽  
Constant Current ◽  
Led Driver ◽  
Amplitude Control ◽  
High Power Factor ◽  
High Power Led ◽  
Driver Circuit

This paper proposes a high-power LED driver circuit with economical high power factor based on universal chip NCP1200. NCP1200 itself doesn’t have the function of APFC, however, by adding a simple amplitude control circuit in the periphery without using special dedicated APFC chip, the APFC rectification mode can be achieved at work, which greatly reduce the pulse current caused by first-time rectification, the power factor can be as high as 98%, and it can achieve the goal of constant current drive in the meantime. The designed circuit is simple, low cost, stable and reliable work ability and it has high cost performance.

scholarly journals Design of a high performance AC-DC LED driver based on SEPIC topology

2021 ◽  
Vol 12 (2) ◽  
pp. 870
Author(s):  
Fouzia Ferdous ◽  
A. B. M. Harun Ur Rashid
Keyword(s):  
Power Factor ◽  
High Power ◽  
High Efficiency ◽  
System Stability ◽  
Input Current ◽  
Constant Current ◽  
Led Driver ◽  
Good Efficiency ◽  
Soft Start ◽  
High Power Factor

Light emitting diodes (LEDs) are current driven devices. So, it is essential to maintain the stability of LED voltage and current. Variation of temperature may cause of instabilities and bifurcations in the LED driver. Driving LEDs from an offline power source faces design challenges like it have to maintain low harmonics in input current, to achieve high power factor, high efficiency and to maintain constant LED current and to ensure long lifetime. This paper proposes the technique of harmonics reduction by using parametric optimization of Single ended primary inductor converter (SEPIC) based LED driver. Without optimization of SEPIC parameters input energy will not be properly transferred to the load and this un-transferred energy will be transmitted to the source. Consequently, the quality of input current will be hampered i.e. harmonics will contaminate the input current. Focussing this, the paper has presented the design of a non-isolated integrated-stage single-switch constant current LED driver operating in discontinuous conduction mode (DCM) in SEPIC incorporating the design of control circuit with soft start mechanism. This LED driver has achieved a good efficiency (90.6%) and high-power factor (0.98) with reduced harmonics (3.35%). System stability has been determined and simulation studies are performed to confirm the validity of the LED driver circuit. A laboratory prototype is built.

scholarly journals A Novel Single-Switch Single-Stage LED Driver with Power Factor Correction and Current Balancing Capability

Electronics ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1340
Author(s):  
Yih-Her Yan ◽  
Hung-Liang Cheng ◽  
Chun-An Cheng ◽  
Yong-Nong Chang ◽  
Zong-Xun Wu
Keyword(s):  
Power Factor ◽  
High Power ◽  
Pulse Width Modulation ◽  
Power Factor Correction ◽  
Harmonic Distortion ◽  
Boost Converter ◽  
Single Stage ◽  
Led Driver ◽  
Flyback Converter ◽  
High Power Factor

A novel single-switch single-stage high power factor LED driver is proposed by integrating a flyback converter, a buck–boost converter and a current balance circuit. Only an active switch and a corresponding control circuit are used. The LED power can be adjusted by the control scheme of pulse–width modulation (PWM). The flyback converter performs the function of power factor correction (PFC), which is operated at discontinuous-current mode (DCM) to achieve unity power factor and low total current harmonic distortion (THDi). The buck–boost converter regulates the dc-link voltage to obtain smooth dc voltage for the LED. The current–balance circuit applies the principle of ampere-second balance of capacitors to obtain equal current in each LED string. The steady-state analyses for different operation modes is provided, and the mathematical equations for designing component parameters are conducted. Finally, a 90-W prototype circuit with three LED strings was built and tested. Experimental results show that the current in each LED string is indeed consistent. High power factor and low THDi can be achieved. LED power is regulated from 100% to 25% rated power. Satisfactory performance has proved the feasibility of this circuit.

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