Resonant Converter with Bi-directional Power Flow and Balance Currents

Resonant Converter with Bi-directional Power Flow and Balance Currents

This research paper concerns the implementation of a direct current to direct current zero voltage operation converter with an addition parallel inductor and a current balance magnetic so as to realize high circuit efficiency, balance secondary-side currents and achieve bi-directional power flow. The studied resonant converter was determined by a frequency-control half-bridge circuit on the primary side and two parallel full-wave rectifier circuits on the secondary side. Series resonant tank was employed on primary side to achieve the advantage of low switching losses of power devices on primary and secondary sides. The current balance issue of two center-tapped rectifiers on low voltage side was realized by a current balance magnetic-coupling core. Power switches were used on both of the primary and secondary sides to reduce the conduction losses and achieve bi-directional power flow capability. The performance of the presented circuit was confirmed by a laboratory prototype with 720W rated power.