A New Negative Output Buck-Boost Converter with Wide Conversion Ratio

Abstract

In this paper, a new negative output (N/O) buck-boost converter, which can be applied for applications that need wide range of inverse voltage, is proposed. The steady state, small signal model and power losses of the proposed converter operating in continuous conduction mode (CCM) are analyzed. Comparisons among the traditional buck-boost converter, N/O hybrid buck-boost converter and N/O self-lift Luo converter are presented, and it is found that the proposed converter possesses a widest voltage conversion ratio in these four converters.

Existing System

Voltage Lift Technique.

Proposed System

A new negative output buck-boost converter is proposed, analyzed and validated in this paper. The detailed steady state theoretical analysis and comparisons with other N/O converters are introduced. Small signal model is established and verified by the simulations for further dynamical behaviors analysis and system design. The power losses are analyzed for calculating the efficiency. The results from the theoretical calculations, the simulations and experiments are in agreement with each other, and show that the proposed converter has no current spike and can achieve a wider range of negative output voltage. Thus, the proposed converter can provide a considerable alternative for industrial applications which need wide range of negative output voltage.

Architecture

New negative output buck-boost converter