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 48V 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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