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Stability Analysis of Multiple LEDs Dimming Circuits: An Interaction between an LC Input Filter and Two Buck Converters

Abstract : This paper proposes an average modeling of LED dimming circuits controlled by an indirect sliding mode technique. The circuit and control parameters that affect a multiple LED dimming system's stability are studied. The dimming system comprises two output-capacitorless buck converters and each converter connected to two strings of LEDs as a load. These dimming buck converters are connected to a 48 V power source via an LC filter to reduce the input ripple current. It is known that fast response dc-dc converter might lead to unstable operation of the system due to its negative input resistance characteristic. This paper investigates the control parameters of the sliding control that affect dynamics of a DC bus due to the change of the operating point of LED. The theoretical model is validated through experimental results obtained from the test bench.
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https://hal.univ-lorraine.fr/hal-03222915
Contributor : Bernard Davat <>
Submitted on : Monday, May 10, 2021 - 3:18:30 PM
Last modification on : Wednesday, May 12, 2021 - 4:37:04 PM

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  • HAL Id : hal-03222915, version 1

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Apinya Siangsanoh, Viboon Chunkag, Matheepot Phattanasak, Roghayeh Gavagsaz Ghoachani. Stability Analysis of Multiple LEDs Dimming Circuits: An Interaction between an LC Input Filter and Two Buck Converters. 2016 International Electrical Engineering congress, IEECON2016, Mar 2016, Chiang Mai, Thailand. pp.417-420. ⟨hal-03222915⟩

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