关键词: 功率变换, 自激振荡, 推挽变换, Royer电路, 混合集成

Abstract: The power supply of electronic devices often adopts a distributed power supply architecture, which converts primary power into various voltages and powers required by electronic devices through DC-DC power conversion. The terminal voltage of electronic devices is getting lower and lower (such as supplying MCU, FPGA and other devices with a voltage of 1.5-3.3 V), but some signal digital circuits, driver circuits, etc. in electronic devices require low-power power supplies with a voltage of 5 V or 12 V and a power of about 1 W. At the same time, it is necessary to isolate the mutual interference between the main power circuit and the signal circuit to ensure the precision and signal integrity of the signal circuit. If power conversion is directly carried out from a power bus, the conversion efficiency is low, the volume is large, and the mass is large. Based on the Royer transform circuit, a self-excited push-pull isolation transform circuit is proposed to meet the power supply needs of electronic devices, as well as the requirements for efficiency, volume, and quality. By studying the working principle of the circuit, modal analysis is conducted, and the calculation and design process of key component parameters are given, based on this, a sample is developed through circuit test to verify its feasibility.

Key words: power conversion, self-excited oscillation, push-pull conversion, Royer circuit, hybrid integration