A Novel Constant-pulse Scheme for Synchronous Half-bridge Converter Module

Half-bridge topology converters are favored over full-bridge topologies due to their lower cost, circuit simplicity, and benefits for high-power applications. This study demonstrates a new pulse width modulation (PWM) control strategy for a half-bridge converter implemented with two TL494 IC. It is featured a maximum turn-on time for high-side MOSFETs in a half-bridge converter to reduce overall power loss. The proposed PWM generator is proven to work at a switching frequency of 35 kHz with a load of 0.4 mH using Infineon SiC MOSFETs at 10%, 25%, and 40% duty cycles. The high-side power loss is reduced by up to 45% by the proposed PWM scheme.