Explain in detail the five characteristics of regulated power supply
1. Low power consumption and high efficiency. In the switching regulated power supply circuit, under the excitation of the excitation signal, the transistor V alternately works in the on-off and off-on switching states. The switching speed is very fast, and the frequency is generally about 50kHz. In some advanced technologies In the country, it can be hundreds or nearly 1000kHz. This makes the power consumption of the switching transistor V very small, and the efficiency of the power supply can be greatly improved, and its efficiency can reach 80%.
2. Small size and light weight. It can be clearly seen from the functional block diagram of the switching regulated power supply that no bulky power frequency transformer is used here. Since the dissipation power on the adjustment tube V is greatly reduced, a larger heat sink is omitted. Due to these two reasons, the switching regulated power supply is small in size and light in weight.
3. Wide range of voltage regulation. The output voltage of the switching regulated power supply is regulated by the duty cycle of the excitation signal, and the change of the input signal voltage can be compensated by frequency modulation or width adjustment, so that it can still be able to operate when the power frequency grid voltage changes greatly. Ensure a more 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 of changing the duty cycle, the pulse width modulation type and the frequency modulation type. In this way, the switching regulated power supply not only has the advantage of a wide range of voltage regulation, but also has many methods to achieve voltage regulation. Designers can flexibly choose various types of switching regulated power supplies according to the requirements of practical applications.
4. The efficiency of filtering is greatly improved, and the capacity and volume of the filter capacitor are greatly reduced. The operating frequency of the switching regulated power supply is basically 50kHz at present, which is 1000 times that of the linear regulated power supply, which increases the filtering efficiency after rectification by almost 1000 times. It is to use half-wave rectification and add capacitor filtering, and the efficiency is also increased by 500b times. Under the same ripple output voltage, when the switching regulated power supply is used, the capacity of the filter capacitor is only 1/500-1/1000 of the filter capacitor in the linear regulated power supply.
5. The circuit form is flexible and diverse. For example, there are self-excited and other-excited, width-adjustable and frequency-modulated, single-ended and double-ended, etc. Designers can use the advantages of various types of circuits to design switches that can meet different applications Power Supply
