Detailed explanation of the five characteristics of voltage-stabilized power supply

　　2. Small size and light weight. From the principle block diagram of the switching voltage-stabilized power supply, it can be clearly seen that no bulky power frequency transformer is used here . Since the power dissipation on the adjustment tube V is greatly reduced, a large heat sink is omitted. Due to these two reasons, the switching voltage-stabilized power supply is small in size and light in weight.

　　3. Wide voltage regulation range. The output voltage of the switching voltage regulator is adjusted by the duty cycle of the excitation signal. 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 to change the duty cycle: pulse width modulation and frequency modulation. In this way, the switching voltage regulator not only has the advantage of a wide voltage regulation range, but also has many ways to achieve voltage regulation. Designers can flexibly select various types of switching voltage regulators according to the requirements of actual applications.

　　4. The efficiency of filtering is greatly improved, which greatly reduces the capacity and volume of the filter capacitor. The operating frequency of the switching power supply is basically 50kHz, which is 1000 times that of the linear power supply, which makes the filtering efficiency after rectification almost 1000 times higher. Even if half-wave rectification is used followed by capacitor filtering, the efficiency is also increased by 500 times. Under the same ripple output voltage, when using a switching power supply, the capacity of the filter capacitor is only 1/500-1/1000 of the filter capacitor in the linear power supply.

　　5. The circuit form is flexible and diverse. For example, there are self-excited and externally excited types, width-modulated and frequency-modulated types, single-ended and double-ended types, etc. Designers can give full play to the strengths of various types of circuits and design switching power supplies that can meet different application occasions.