Explain the five characteristics of voltage stabilized power supply
1. Low power consumption and high efficiency. In the switching regulated power supply circuit, the transistor V in the excitation signal under the excitation, it alternately works in the on - cut-off and cut-off - on switching state, the conversion speed is very fast, the frequency is generally about 50kHz, in some technologically advanced countries, can be done a few hundred or nearly 1,000kHz. This makes the switching transistor V power consumption is very small, the efficiency of the power supply can be greatly improved, its efficiency can reach 80%.
2. Small size and light weight. From the schematic block diagram of the switching regulator power supply can be clearly seen here without the use of bulky industrial frequency transformer. As a result of the adjustment tube V on the power dissipation is greatly reduced, and eliminates the need for a larger heat sink. Because of these two reasons, so the switching regulator power supply is small in size and light in weight.
3. Wide range of voltage regulation. The output voltage from the switching regulated power supply is regulated by the duty cycle of the excitation signal, the change of the input signal voltage can be compensated by the frequency adjustment or widening, so that in the industrial frequency grid voltage variations, it is still able to ensure that there is a more stable output voltage. Therefore, the voltage stabilization range of switching power supply is very wide and the voltage stabilization effect is very good. In addition, there are two methods to change the duty cycle: pulse width modulation type and 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 more ways to realize voltage regulation, designers can flexibly choose various types of switching regulated power supply according to the requirements of practical applications.
4. The efficiency of filtering is greatly improved, so that the capacity and volume of filter capacitors are greatly reduced. Switching regulated power supply operating frequency is basically working at 50kHz, is a linear regulated power supply 1000 times, which makes the rectifier filtering efficiency almost also increased by 1000 times. Is the use of half-wave rectification with capacitor filtering, the efficiency is also increased by 500b times. In the same ripple output voltage, the use of switching regulator power supply, the capacity of the filter capacitor is only linear regulator power supply filter capacitance of 1/500-1/1000.
5. The circuit form is flexible. For example, there are self-excited and other excitation type, there are broadening and frequency modulation type, single-ended and double-ended, etc., the designer can play a variety of types of circuit strengths, designed to meet the different applications of switching regulated power supply.
