Research on High-Voltage Isolated Gate Driver Based on Wireless Power Transfer Technology

This paper designs a wireless power and signal simultaneous transmission circuit based on the DDQ magnetic coupling structure, aimed at transmitting the driving voltage and driving signal for the isolated gate driver. In this circuit, power and signal transmission are decoupled using <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$Q$</tex> coils for power and DD coils for signal transmission. When these two coil pairs are aligned, no mutual inductive flux is generated, thus achieving zero-crossing coupling between the transmission channels, effectively preventing interference between them. The power and signal transmission circuits share a common inverter square wave output stage. The power transmission circuit utilizes the fundamental frequency component of the square wave to deliver power, while the signal transmission circuit leverages the third harmonic frequency component for signal transmission, enabling multi-frequency multiplexing of the square wave and reducing overall hardware complexity and cost. Additionally, the output characteristics and crosstalk between the circuits are analyzed. Through careful design of the circuit structure and parameters, a signal-to-noise ratio (SNR) of 28 dB and a data transmission rate of 60 kb/s are achieved. These results are validated through both simulations and experimental tests.