A new parallel resonant converter link voltage control

This paper describes a new control strategy of the parallel resonant DC link converter called voltage peak control (VPC). VPC limits the link voltage to twice the DC link voltage. The strategy eliminates the need of additional power electronic components that clamp the link voltage. A presentation of the VPC strategy is done and then follows an experimental verification which shows a good agreement between theoretical and measured values. The VPC strategy introduces hard switching at low voltage at a limited number of switching instants. The switching losses are experimentally measured and evaluated. A substantial reduction of the switching losses using a lower turn-off voltage is measured compared to switching losses in PWM-VSI. Finally, the VPC strategy is demonstrated experimentally and it works according to theory.