Bidirectional DC–DC Wireless Power Transfer Based on LCC-C Resonant Compensation

Abstract

A bidirectional dc-dc wireless power transfer (WPT) based on LCC-C resonance compensation is proposed in this article. For the power flowing from the primary side to the secondary side (P2S), the voltage source is converted to a current source (V-C) on the primary side and the current source is converted to a voltage source (C-V) on the secondary side. For the power flowing from the secondary side to the primary side (S2P), the V-C conversion occurs on the secondary side and the C-V conversion occurs on the primary side. The proposed bidirectional dc-dc WPT using LCC-C resonance compensation exhibits several advantages: 1) it operates in bidirectional power flow; 2) it prevents burn out of the coil when there is an open circuit on the load side or the coils are misaligned; and 3) it outputs a constant current (CC) or a constant voltage (CV). A hardware prototype is designed using the specification SAE-J2954, the operating frequency is 85 kHz, the maximum output power is 3.7 kW and the vertical distance for the coil gap is 15 cm. The experimental results verify that the proposed bidirectional dc-dc WPT performs as expected.