In 1955, American scientist GH Royer first developed a transistor DC converter that uses self-oscillation of the saturation of the core. Since then, various forms of precision DC converters using this technology have been continuously developed and emerged, replacing the early-stage rotary and mechanical vibrator converters with short life, poor reliability, and low conversion efficiency. Since the power transistor in the transistor DC converter operates in the switching state, the regulated power supply thus produced has a large number of groups, variable polarity, high efficiency, small size, and light weight, and thus is widely used at that time. For aerospace and military electronic equipment. Since the microelectronic equipment and technology at that time were very backward, it was impossible to produce a transistor with high withstand voltage, high switching speed and high power. Therefore, the DC converter of this period can only use low voltage input, and the conversion speed cannot be Too high.
In the 1960s, due to the rapid development of microelectronics technology, high back pressure transistors appeared. From then on, the DC converter can be directly rectified and filtered by the mains, and the power frequency transformer is no longer required to be stepped down, thus greatly expanding. Its application range, and on this basis, the birth of a switching power supply without power frequency step-down transformer. The power frequency transformer is saved, and the volume and weight of the switching power supply are greatly reduced. The switching power supply is truly high in efficiency, small in size, and light in weight.
After the 1970s, high-frequency, high-pressure power transistors, high-frequency capacitors, switching diodes, and iron cores of switching transformers, which are related to this technology, have been continuously developed and produced, so that switching of power frequency-free transformers is regulated. The power supply has been rapidly developed, and is widely used in the fields of electronic computers, communications, aerospace, color televisions, etc., so that the power-free transformer switching power supply has become the leader of various power sources.
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