Quantum mechanics

Control (management)

Voltage

Engineering

Dead time

Node (physics)

Bridge (graph theory)

Telecommunications

Power (physics)

Half bridge

Parallel computing

Computer science

Transfer (computing)

Physics

Inverter

Power control

Electronic engineering

Internal medicine

Artificial intelligence

Wireless power transfer

Structural engineering

Medicine

Wireless

Control theory (sociology)

Overshoot (microwave communication)

Electrical engineering

IEEE Transactions on Industrial Electronics

This paper presents the development of a Class-D full-bridge zero-voltage switching (ZVS) inverter, applicable to wireless power transfer (WPT) systems, operating at 13.56 MHz switching frequency with dynamic dead-time control (DDTC). Resonant-coupled WPT systems are being designed at ultrahigh switching frequencies to reduce the size of the wireless link and the passive components. Maintaining ZVS while controlling the output power delivered to a fixed or variable load is one of the major challenges of designing inverters at multi-MHz switching frequencies. DDTC is the approach deployed in this paper to sustain soft switching of a Class-D full-bridge inverter over the full range of output power while regulating the input dc bus voltage. Simulation results are presented to show that dynamically controlling the dead-time during input dc bus voltage variations reduces switch-node voltage overshoot, prevents large current spikes in the switching devices, and reduces associated high switching loss. Practical results obtained show that DDTC reduces switch-node voltage overshoot, increases the inverter efficiency, and reduces the steady-state temperature of the inverter during output power regulation.

A 13.56-MHz Full-Bridge Class-D ZVS Inverter With Dynamic Dead-Time Control for Wireless Power Transfer Systems