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一引言目前,我国电子计算机和某些其它电子设备已采用晶体管串联开关电源供电,串联开关电源与串联线性调整稳压电源比较具有体积小,效率高的优点。但是,串联开关电源仍需要工频电源变压器作为降压和隔离之用,因而就限制了其体积和重量的进一步减小。为此无工频电源变压器开关电源的研制和应用日益受到重视。本电源是采用脉宽调制半桥变换式开关电源。这种电源直接输入220伏,50周交流电,经整流滤波后供给半桥变换器工作,省去了笨重的50周电源变压器,由于半桥变换器工作在10千赫,所以仅用一个很小的变压器就实现了电压变换和输入、输出的隔离,又因功率开关
I. INTRODUCTION At present, the electronic computer and some other electronic devices in our country have been powered by the transistor series switching power supply. The series switching power supply has the advantages of small size and high efficiency in comparison with the linear power supply with linear regulation. However, the series switching power supply still needs power frequency power transformer for buck and isolation, thus limiting its further reduction in size and weight. For this reason no power frequency power transformer switching power supply development and application of more and more attention. The power is the use of pulse-width modulation half-bridge switching power supply. This power directly into the 220 volts, 50 weeks AC, the rectifier filter to provide half-bridge converter work, eliminating the need for bulky 50-week power transformer, half-bridge converter at 10 kHz, so only a very small The transformer to achieve the voltage conversion and input and output isolation, due to power switch