Advantages and disadvantages of switching sources
Switching Regulated Power Supply Advantages:
Low power consumption and high efficiency. In the switching power supply circuit in Figure 1, the transistor V is excited by the excitation signal, it alternately works in the on-off and off-on switching state, the conversion speed is very fast, the frequency is generally about 50kHz, in some technologically advanced countries, it can be done in several 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%.
Small size and light weight. It is clear from the block diagram of the switching power supply that no bulky industrial frequency transformer is used here. As the power dissipated on the adjustment tube V is substantially reduced, and then eliminates the need for a larger heat sink. Due to these two reasons, the switching power supply is small in size and light in weight. Switching Power Supply Solutions
Wide voltage regulation range. The output voltage from the switching power supply is regulated by the duty cycle of the excitation signal, and the variation of the input signal voltage can be compensated by frequency modulation or widening. In this way, when the industrial frequency grid voltage varies greatly, it can still ensure a more stable output voltage. Therefore, the switching power supply has a wide voltage regulation range and a good voltage regulation effect. In addition, the method of changing the duty cycle has two types: pulse width modulation type and frequency modulation type. Switching power supply not only has the advantage of a wide range of voltage stabilisation, but also more ways to achieve voltage stabilisation, designers can flexibly choose various types of switching power supply according to the requirements of the actual application. Switching power supply solutions
The efficiency of filtering is greatly improved, so that the capacity and volume of filter capacitors are greatly reduced. Switching 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; even if the use of half-wave rectification with capacitor filtering, the efficiency is also increased by 500 times. In the same ripple output voltage, the use of switching regulated power supply, the capacity of the filter capacitor is only linear regulated power supply filter capacitance of 1/500 ~ 1/1000. circuit form flexible, self-excited and other excitation type, there is a broadening and frequency type, single-ended and double-ended, etc., the designer can play a variety of types of circuits to play a speciality, designed to meet the different applications of the switching power supply.
Switching power supply disadvantages:
The disadvantage of switching power supply is the existence of more serious switching interference. Switching power supply, power adjustment switching transistor V work in the switching state, it produces AC voltage and current through the circuit of other components to produce spike interference and resonance interference, these interferences if you do not take certain measures to inhibit, eliminate and shielding, will seriously affect the normal operation of the machine. In addition, because the switching power supply oscillator does not have the isolation of the industrial frequency transformer, these interferences will be strung into the industrial frequency power grid, so that other electronic instruments, equipment and household appliances in the vicinity of the serious interference. Switching
