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EnglishThe output voltage from the switching power supply is adjusted by the duty cycle of the excitation signal, and the change of the input signal voltage can be compensated by frequency modulation or width modulation. In this way, when the power frequency grid voltage changes greatly, it can still ensure a relatively stable output voltage. Therefore, the voltage regulation range of the switching power supply is very wide, and the voltage regulation effect is very good. In addition, there are two methods for changing the duty cycle: pulse width modulation and frequency modulation. Switching power supply not only has the advantages of wide voltage regulation range, but also has many methods to realize voltage regulation. Designers can flexibly choose various types of switching power supplies according to the requirements of actual applications.
The efficiency of filtering is greatly improved, and the capacity and volume of the filtering capacitor are greatly reduced. The operating frequency of the switching power supply is currently basically 50kHz, which is 1000 times that of the linear stabilized power supply.
This makes the filter efficiency after rectification almost 1000 times higher; even if half-wave rectification is used and capacitor filtering is added, the efficiency is also improved 500 times. Under the same ripple output voltage, when the switching power supply is used, the capacity of the filter capacitor is only 1/500~1/1000 of the filter capacitor in the linear stabilized power supply. The circuit forms are flexible and diverse, including self-excited and other-excited, and Wide-modulation type and frequency-modulation type, there are single-ended and double-ended, etc., designers can take advantage of various types of circuits to design switching power supplies that can meet different applications.
