Single-Inductor Dual-Output Dc-Dc Converter Design Using Rc Ripple Regulator Method

In this paper, we have proposed Single-Inductor Dual-Output (SIDO) buck-buck and boost-boost dc-dc converter using improved RC ripple regulator control. The proposed SIDO buck-buck converter has the characteristics of low-ripple and high control frequency. RC ripple regulator control cannot be applied to SIDO boost-boost converter because RC ripple regulator undergoes self-excited oscillation and two self-excited oscillating controllers make the SIDO converter unstable. Thus we proposed the priority circuit for RC ripple regulator control. The proposed control circuit improves response characteristic and simplicity of the control circuit. Simulations are performed to verify the validity of the proposed SIDO converter. Simulation results indicate good performance of the proposed SIDO converter.