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High-brightness light-emitting diodes (HBLEDs) are conventionally driven in the amplitude mode (AM) or pulse-width-modulation (PWM) mode. High luminous efficacy is obtained with AM, but precise dimming is difficult to achieve and such AM-driven LEDs suffer from significant color variations. PWM offers excellent dimming capability and color stability but the LEDs acquire lower luminous efficacies compared...
This paper proposes a class of hybrid dual-operating-mode pulse-width-modulation based sliding mode controllers for DC-DC converters functioning in both the continuous and discontinuous conduction modes. The controllers are simplified hybrid combinations of sliding mode controllers designed for the continuous conduction mode and sliding mode controllers designed for the discontinuous conduction mode...
This paper addresses the issues concerning the implementation of a pulse-width-modulation based sliding mode controller for boost converters. The methods of modelling the system and translation of the SM control equations for the PWM implementation are illustrated. It is shown that the control technique is easily realized with simple analog circuitries. The proposed system is verified by experimental...
This paper addresses the issues concerning the implementation of a pulse-width-modulation based sliding mode controller for boost converters. The methods of modelling the system and translation of the SM control equations for the PWM implementation are illustrated. It is shown that the control technique is easily realized with simple analog circuitries. The proposed system is verified by experimental...
This paper discusses a family of fixed-frequency pulse-width-modulation based sliding mode voltage controllers for basic DC-DC converters operating in continuous conduction mode. An experimental comparison is offered between the proposed controller and the PWM peak current mode controller for the case of the boost converter. The performances and properties of the proposed controller, the conventional...
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