Enhancing the Operational Range of the Bridge Type Inverse Watkins Johnson Converter

Authors

  • V.Jothi Arulkumar Austin, Ravi Arumugam

Abstract

The bridge type Inverse Watkins Johnson Converter (IWJC) is a versatile DC to DC converter that is capable of delivering a duty cycle controlled polarity reversible output voltage. In the open loop configuration, the IWJC can deliver positive output boost voltages for duty cycles between 1.0 and 0.5 and for duty cycles between 0.0 and 0.5 it can deliver buck boost voltages with reversed polarity. However, there is no range of duty cycles between 0.0 and 1.0 that can be mapped to the positive output buck region of operation. In this work, a Sliding Mode Control (SMC) is proposed to get regulated positive output voltage in the buck region. The state space average model and the circuit model in MATLAB SIMULINK environment have been developed. An experimental proto type has also been built to validate the proposed idea. The results validate the proposed idea of using an SMC for regulating the output voltage in the positive output buck region. The proposed control scheme can also be used for regulating voltages in the other regions of operations of the bridge type IWJC as well.

. Keywords-The Inverse Watkins Johnson Converter – Positive Output Buck Mode operation – Sliding Mode Control – State Space Analysis – Average State Space Modeling.

Published

2020-11-28

Issue

Section

Articles