Output Current Limiting for ON-OFF Controlled Very High Frequency Class E DC-DC Converter

The ON-OFF controlled very high frequency Class E dc-dc converter has been widely investigated for achieving high power density and high fast dynamic response. However, the ON-OFF controlled converter is not able to limit the converter output current in the event of the overload or short-circuit fault, bringing the converter with the potential risk of overcurrent damage. To solve this problem, this paper proposes a current limiting scheme for the ON-OFF controlled converter, with which, a current regulator is added to limit the converter output current in presence of the overload or short-circuit fault without impacting the converter’s normal operation. Experimental results have been provided to verify the feasibility of the proposed current limiting scheme for a 30 MHz,10W ON-OFF controlled Class E dc-dc converter.