A Dual-Channel Wireless Charging System With Strong Anti-Misalignment Capability for Single or Dual Automated Guided Vehicle

Wireless charging systems (WCSs) offer significant advantages over traditional plug-in charging for automated guided vehicles (AGVs). This article proposes a novel WCS featuring strong anti-misalignment capability and dual constant voltage (CV) outputs for simultaneous charging of power and auxiliary batteries in AGVs. It employs a distributed solenoid coil topology with a T-shaped equivalent circuit to achieve robust performance under misalignment conditions. The key innovation lies in maintaining a constant difference between self-inductance and mutual inductance, which ensures stable output voltage despite positional variations. The distributed solenoid coil design effectively minimizes the difference of inductance fluctuations during horizontal misalignment, while the output voltage can be dynamically regulated to match battery charging requirements. Furthermore, the system demonstrates great practical functions by supporting simultaneous charging of two AGVs without requiring larger transmitter dimensions, and the receiver design also maintains compatibility with double-D (DD) coil transmitters. An experimental platform has been established to confirm the system’s robust performance. With the solenoid coil transmitter, the maximum output voltage fluctuation remains within 4.81% across a horizontal misalignment range of 0–150 mm (50% of transmitter coil width). Similar performance (2.71% fluctuation) is achieved with DD coil transmitters. The system also exhibits strong tolerance to vertical (Z-direction) misalignment.