開關電源外文翻譯-其他專業(yè)-展示頁
2025-01-31 11:19本頁面
【正文】 ition to providing detection circuitprotection circuit is running various parameters, but also provide information displayinstruments. The auxiliary power supply circuit for the single power supply to the differentrequirements. The change switch connected to the work cycle time and the ratio of the voltage betweenthe average change also, therefore, With the load and input supply voltage changes andautomatically adjust ratio, it will cause the output voltage unchanged. Change the access timeand cycle percentage change is the pulse duty cycle. This method, known as time ratiocontrol (Time Ratio Control, for the initials TRC). TRC under control principle, there are three ways : 1. Pulse width modulation (PulseWidth Modulation, acronym for PWM) switching constant cycle by changing the pulse widthto change the duty cycle approaches. 2, pulse frequency modulation (Pulse FrequencyModulation, acronym for the PFM) conduction pulse width constant by changing theswitching frequency to change the duty cycle approaches. 3, mixed conduction modulationand pulse width switching frequency not fixed are, they change the way It is more than twohybrid models. A pulsewidth modulation control chip invented in 1975 spurred the development of switching power supplies,leading to a power control IC industry that today is measured inbillions of dollars. Over the past few years, a series of monolithic integrated circuits for the control of switching power supplies have been introduced. One of these, the TL494, bines many ofthe features previously requiring several control circuits. The TL494 simpl
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