Analysis of class E low di/dt rectifier with a series inductor

An analysis and an experimental verification are presented for a class-E zero-current switching (low di/dt) rectifier. The circuit consists of a rectifier diode, an inductor connected in series with a diode, and a filter capacitor. The addition of the series inductor allows the rectifier to decouple the diode ON duty cycle and the output ripple voltage. The series inductor sets the value of the diode ON duty cycle which can be large, e.g. 0.5. The filter capacitor independently sets the level of the ripple voltage. The rectifier diode turns on at zero di/dt and low dv/dt and turns off at low |dt/dt|, reducing switching losses, switching noise, and reverse-recovery current. The experimental results confirmed theoretical predictions. Other topologies of unregulated and regulated synchronous rectifiers are also discussed