Modeling the Output Impedance of a T-Type Power Converter

The impact of operating point dependent switching time delays on the output characteristic of a T-type half-bridge is investigated for dc-dc operation. It is found that a series connection of operating point dependent components, i.e., a differential resistance and a voltage source, can accurately reproduce the implications of these switching time delays on the response of the output current of the half-bridge to a step of the duty cycle. This letter details the calculation of these components and verifies the derived expressions by means of experimental results.