Design of Dimmable Light Emitting Diode Driver for Low Power Applications

Ramanjaneya reddy U, Kalyan Kumar Koppolu


High-brightness light emitting diodes (HB-LED) are used in various applications in preference to conventional light bulbs due to
following merits: eco-friendly nature, high luminous efficacy, prolonged life, compactness and low heat dissipation. This work
presents the boost converter fed dimmable light emitting diode where illumination control is required. The proposed work uses
pulse width modulated (PWM) controlled switch in series with LED load to control the illumination level by adjusting the pulse
width. The closed loop control is designed in Matlab/Simulink to regulate the load voltage. This paper first illustrates in detail
the basic operation of the converter and dimming control and then provides the simulation results with different illumination
levels to demonstrate the effectiveness of converter and controller.


Light emitting diode, Pulse width modulation, boost converter, closed loop control, illumination

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C. K. Ramakrishnareddy, P. Shunmugam, N. Vishwanathan, Soft

switched full-bridge light emitting diode driver configuration for street

lighting application, IET Power Electronics 11 (1) (2017) 149–159.

U. Ramanjaneya Reddy, B. Narasimharaju, Unity power factor buckboost

led driver for wide range of input voltage application, in: 2015

Annual IEEE India Conf.(INDICON), 2015, pp. 1–6.

H.-J. Chiu, Y.-K. Lo, J.-T. Chen, S.-J. Cheng, C.-Y. Lin, S.-C. Mou, A

high-efficiency dimmable led driver for low-power lighting applications,

IEEE Transactions on Industrial Electronics 57 (2) (2009) 735–743.

U. R. Reddy, B. L. Narasimharaju, Single-stage electrolytic capacitor

less non-inverting buck-boost pfc based ac–dc ripple free led driver,

IET Power Electronics 10 (1) (2017) 38–46.

S. Wang, X. Ruan, K. Yao, S.-C. Tan, Y. Yang, Z. Ye, A flicker-free electrolytic

capacitor-less ac–dc led driver, IEEE Transactions on Power

Electronics 27 (11) (2011) 4540–4548.

B. L. Narasimharaju, U. R. Reddy, R. Dogga, Design and analysis of

voltage clamped bidirectional dc–dc converter for energy storage applications,

The Journal of Engineering 2018 (7) (2018) 367–374.

U. Ramanjaneya Reddy, B. Narasimharaju, Improved efficiency coupled

inductor-buck ac-dc light emitting diode (led) driver, IEICE Electronics

Express 13 (16) (2016) 20160626–20160626.

R. Reddy, B. Narasimharaju, Enhanced closed loop voltage control of

buck converter for improved performance, in: IEEE Annual IEEE India

Conference (INDICON), 2014, pp. 1–5.

C.-A. Cheng, H.-L. Cheng, F.-L. Yang, C.-W. Ku, Single-stage driver

for supplying high-power light-emitting-diodes with universal utility-line

input voltages, IET Power Electronics 5 (9) (2012) 1614–1623.

U. R. Reddy, B. Narasimharaju, High step-down dual output light emitting

diode driver, International Journal of Renewable Energy Research

(IJRER) 7 (1) (2017) 157–169.

B. Singh, V. Bist, A pfc based bldc motor drive using a bridgeless zeta

converter, in: IECON 2013-39th Annual Conference of the IEEE Industrial

Electronics Society, IEEE, 2013, pp. 2553–2558.

R. R. Udumula, B. Narasimharaju, A. Md, Voltage mode control dcm

hsd-cib pfc converter for hb-led lighting applications, Journal of Power

Technologies 98 (4) (2018) 305–313.

K. Hwu, Y. Yau, L.-L. Lee, Powering led using high-efficiency sr flyback

converter, IEEE Transactions on Industry Applications 47 (1) (2010)


U. R. Reddy, B. Narasimharaju, A cost-effective zero-voltage switching

dual-output led driver, IEEE Transactions on Power Electronics 32 (10)

(2016) 7941–7953.


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