CONTINUOUS SLIDING MODE APPROACH FOR A SELF-LIFT LUO CONVERTER VIA HIGH-ORDER SWITCHING MANIFOLD
Keywords:
Power converter, Control design, Equivalent control techniqueAbstract
A sliding mode duty ratio control is proposed for control of a positive output self-lift Luo converter. The conventional discontinuous sliding mode current method has been commonly used for switching dc/dc converters as it offers several benefits such as robust performance against operating point variations and easy implementation. However, this control strategy suffers from the chattering phenomenon, due to its non-constant switching frequency. It makes the design of input and output filters more difficult and also, increases strongly electromagnetic interface (EMI) problem and inductor saturation possibility. To overcome the mentioned problems, this paper suggests a continuous sliding mode current control scheme based on a double-integral sliding surface. Contrary to the traditional controller, the proposed method can indirectly enforce the defined sliding variable to converge zero. The developed control technique provides not only the fixed switching frequency without chattering but also zero steady-state error and fast response. The modified sliding mode approach is applied to a positive output self-lift Luo converter in continuous conduction mode. The general control law of the proposed structure is derived using the equivalent control concept and the detailed stability of the closed-loop system is investigated using sliding mode theory and small-signal analysis. Moreover, practical results are provided to demonstrate the superior performance of the suggested sliding mode controller as compared with the existing methods.
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