This type of charger provides galvanic isolation and the ability to transfer power from vehicle to grid and reduces the cost and footprint of the system. Isolated bidirectional chargers can be categorized as voltage-fed and current-fed where the full-bridge is connected to the voltage source or a dc-capacitor this configuration is known as voltage fed while the current-fed is where the full-bridge is connected to a current source or a dc inductor. To reduce voltage stress of switches on the current-fed side an active clamp snubber circuit was added into the current-fed side. Adding the active clamp many advantages: ZVS is achieved for all switches on the current-fed side, and on the voltage-fed side ZVS or ZCS is achieved for all switches, circulating current is eliminated which results in higher efficiency as opposed to the conventional phase-shift controlled full-bridge converter.
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