The Advantages of Switching Power Supply
The power supply is the indispensable part of various kinds of electronic equipment. Its performance directly related to technical indicators of electronic equipment and safe, reliable work. Now the commonly used DC voltage stabilizer is divided into switch power supply and linear power supply two categories. Because switch power supply internal key components work in high frequency switch state, itself has very low energy consumption, so switch power efficiency may reach 80% ~ 90%, nearly improved one time over common linear stabilizer, which has become the mainstream of the voltage stabilizer products.
The advantages of switching power supply
Low consumption and high efficiency
In the switching power supply circuit, transistor V, under the excitation of excitation signal, alternately work in switch state, converting speed is quickly, which has a general frequency about 50 kHz or so. In some advanced technology countries, the frequency can reach hundreds of or nearly 1000 kHz. This makes the switch transistor V power consumption is small, the power supply can greatly improved and the efficiency may reach 80%.
Small size, light weight
From the principle diagram of a switching power supply we can see clearly that there is no the cumbersome frequency transformer. Due to the adjustment tube V greatly reduced dissipation power, and left out the larger heat sink, switching power supply has small volume, light weight.
Wide range of voltage
The switching power supply output voltage is modulated by the duty ratio of the excitation signal. The change of input signal voltage can be compensated through the FM or VPW, thus in industrial frequency power grid voltage changes greatly, it is still able to ensure a stable output voltage. So the voltage stabilization range of switch power supply is quite wide, and then the effect is pretty good. In addition, the methods to change the duty ratio are pulse width modulation type (PWM) and frequency modulation type (FM) two kinds. So, a switching power supply voltage not only has the advantages of wide range, it also has many ways to realize voltage stabilization. Designers can flexible use various types of switching power supply according to the actual application requirements,.
Filter efficiency greatly improved
The capacity and volume of the filter capacitance is greatly reduced with the improvement of the filter efficiency. The working frequency of switching power supply at present basically is working in 50 kHz, which is 1000 times of linear stabilizer, this makes the filter efficiency after rectifying almost also raised 1000 times. Even after using the half wave rectifying the capacitance filter, the efficiency is also raised 500 times.
Circuit form flexible and diversified
There are flexible and diversified circuit forms, for example, self-excitation type and separate excitation type, PWM type and FM type, the single-ended type and double-ended type and so on. Designers can play all types of the circuit design, and can satisfy the different application situation of a switching power supply.