交流电源预调节器演示板是一种通用输入、离线、15W 输出、恒压电源，用于为电子仪表或白色家电供电。该预调节器是添加到传统 SMPS 的一项特定功能，位于交流电源整流和输入大容量电容器之间，为反激式转换器供电。该预调节器允许从主电源 (高达 460 Vac) 获得超高交流电源，支持 2 相 (而不是相和中性线) 之间的供电，没有双输入大容量电容器的缺点，并且为使用级联或超高压功率 MOS 晶体管构建的反激式转换器提供相应的高电源电压。开关拓扑是一种非连续模式反激式转换器，采用带有内部 MOSFET 的 ON Semi NCP1075 单片控制器。特定的默认演示板的输出额定值为 12 V，最大电流为 1 A。

The ac-supply pre-regulator demo board is a universal input, off-line, 15-W output, constant voltage power supply for powering E-meters or white goods applications. This pre-regulator is a specific function added to conventional SMPS, placed between ac-supply rectification and input bulk capacitor, supplying Flyback converter. This pre-regulator allows extra high ac-supply from mains (up to 460 Vac), supporting supply between 2 phases (instead of phase and neutral) without drawback of double input bulk capacitors and corresponding high supply voltage for Flyback converter build with cascade or very high voltage Power MOS transistor. The switching topology is a discontinuous mode flyback converter utilizing the ON Semi NCP1075 monolithic controller with internal MOSFET. The specific default demo board has an output rating of 12 V at 1 A max.