In this paper, an adaptive multi-mode PWM control PSR flyback converter is proposed. In constant voltage (CV) mode, the converter adopts primary-side regulate (PSR) scheme to detect load information through the auxiliary winding, which reflects the load information on the voltage of [Formula: see text]. The converter adjusts the switching frequency according to the voltage of [Formula: see text] under different load conditions, realizing adaptive multi-mode PWM control to significantly improve light- load efficiency and thus the overall average efficiency. Besides, it does not give compromise to other system performance, such as audible noise, standby power consumption, and regulation. To verify the feasibility and performance of the proposed circuit, the converter has been designed and fabricated in HHGRACE_0.35[Formula: see text][Formula: see text]m BCD process and verified in a 5V/1A circuit prototype. The experimental results show that 25% load power efficiency of the proposed converter is 78.1%, which is improved by up to 3.4% compared to the conventional converter.

中文翻译：

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一种自适应多模式 PWM 控制 PSR 反激式转换器

本文提出了一种自适应多模式PWM控制PSR反激变换器。在恒压(CV)模式下，转换器采用初级侧稳压(PSR)方案，通过辅助绕组检测负载信息，将负载信息反映在电压上[公式：见正文]。转换器根据[公式：见正文]在不同负载条件下的电压调整开关频率，实现自适应多模式PWM控制，显着提高轻载效率，从而提高整体平均效率。此外，它不会影响其他系统性能，例如可听噪声、待机功耗和调节。为了验证所提出电路的可行性和性能，转换器已经在HHGRACE_0.35[公式：见正文][公式：见正文]m BCD 工艺并在 5V/1A 电路原型中得到验证。实验结果表明，该转换器的25%负载功率效率为78.1%，与传统转换器相比提高了3.4%。