Switching power supply, and the purpose of the switch power supply is introduced
What is a switching power supply?
Switch mode power supply (
The Switch Mode Power Supply, SMPS)
, also called switching power supply, switching converter, is a kind of high frequency electric energy conversion device, is a kind of power supply.
Its function is to a voltage level, through the different forms of architecture into the voltage or current client demands.
Switch power input is ac power source (mostly
Such as mains)
Or dc power supply, and the output are mostly need to dc power supply equipment, such as personal computers, and switch power supply is to convert the voltage and current between.
Switch power supply is different from the linear power supply, switching power supply using the switching transistor is in the full open mode (mostly
And full close mode (
Switch between the two modes have the characteristics of low dissipation, can have high dissipation switching conversion between, but time is very short, so compare save energy and produce less waste heat.
Ideally, switching power supply itself is not consume electricity.
Voltage is regulated through adjusting the transistor conduction and cut-off time to achieve.
Instead, linear power supply in the process of produce the output voltage, transistor work in the district, itself also consumes electricity.
Switch power, high conversion efficiency is one big advantage, but also because of the high working frequency switch power supply, transformer can use small size, light weight, so the switching power supply will be smaller than the size of the linear power supply, will be lighter in weight.
If the power supply of high efficiency, volume and weight is considered the key, the switch power supply is better than linear power supply.
Switch power supply is more complex, however, the internal transistor will frequently switch, if the switch current is handled, may produce noise and other equipment, electromagnetic interference effects and if no particular switch power supply design, its power supply power factor may not be high.
USES switch power supply switch power products are widely used in industrial automation control, military industry equipment, scientific research equipment, LED lighting, industrial control equipment, communications equipment, electrical equipment, instrumentation, medical equipment, semiconductor refrigeration and heating, air purifier, electronic refrigerator, LCD, LED lamps and lanterns, communications equipment, audio and video products, security monitoring, LED lights belt, computer case, digital products and instruments, etc.