A Novel Minimum-Phase Dual-Inductor Hybrid Boost Converter with PWM
Voltage-Mode Controller
Abstract
This paper presents a new dual-inductor hybrid boost converter (DI-HBOC)
with two inductors located at the output. This structure allows
continuous current delivered to the load, thus, reducing the output
filtering capacitor size and the output voltage ripple. By relocating
the inductor at the output, which is the lower current path, the
conduction loss on the inductor can be significantly reduced. The right
half plane zero (RHPZ) in the control-to-output transfer function can
also be eliminated; therefore, a simple pulse-width modulation (PWM)
voltage-mode controller can be used for the proposed DI-HBOC while still
achieving high closed-loop bandwidth and fast transient response. The
distinct features of the proposed converter are analytically
demonstrated. A 12-to 24 V DI-HBOC and a conventional BOC (CBOC) using
low-RON GaN switches with PWM voltage-mode
controller are also implemented in PSIM for verification and comparison.
The simulated peak power efficiency is 97.4 % that is 1.17 % higher
than the CBOC. At 3 A load current, the power efficiency is improved by
9.7 % and the output ripple is only 17.5 mV, 6x lower than in CBOC.