Zero-voltage-switching half-bridge DC-DC converter with modified PWM control method
Abbreviated Journal Title
IEEE Trans. Power Electron.
duty-cycle-shifted (I)CS); half bridge (HB); metal oxide semiconductor; field effect transistors (MOSFETs); pulse-width modulated (PWAI); zero-current switching (ZCS); zero-voltage switching (ZVS); Engineering, Electrical & Electronic
Asymmetric control scheme is an approach to achieve zero-voltage switching (ZVS) for half-bridge isolated dc-dc converters. However, it is not suited for wide range of input voltage due to the uneven voltage and current components stresses. This paper presents a novel "duty-cycle-shifted pulse-width modulated" (DCS PWM) control scheme for half-bridge isolated dc-dc converters to achieve ZVS operation for one of the two switches without causing the asymmetric penalties in the asymmetric control and without adding additional components. Based on the DCS PWM control scheme, an active-clamp branch comprising an auxiliary switch and a diode is added across the isolation transformer primary winding in the half-bridge converter to achieve ZVS for the other main switch by utilizing energy stored in the transformer leakage inductance. Moreover, the auxiliary switch also operates at ZVS and zero-current switching (ZCS) conditions. Furthermore, during the off-time period, the ringing resulted from the oscillation between the transformer leakage inductance and the junction capacitance of two switches is eliminated owing to the active-clamp branch and DCS PWM control scheme. Hence, switching losses and leakage-inductance-related losses are significantly reduced, which provides the converter with the potential to operate at higher efficiencies and higher switching frequencies. The principle of operation and key features of the proposed DCS PWM control scheme and two ZVS half-bridge topologies are illustrated and experimentally verified.
Ieee Transactions on Power Electronics
"Zero-voltage-switching half-bridge DC-DC converter with modified PWM control method" (2004). Faculty Bibliography 2000s. 4568.