The module power supply is a power supply that can be directly mounted on the printed circuit board. Its feature is that it can provide power for application specific integrated circuits (ASIC), digital signal processors (DSP), microprocessors, memories, field programmable gate arrays (FPGA) and other digital or analog loads. Generally speaking, such modules are called point of load (POL) power supply system or point of use power supply system (pups). Due to the advantages of modular structure, modular power supply is widely used in switching equipment, access equipment, mobile communication, microwave communication, optical transmission, routers and other communication fields, as well as automotive electronics, aerospace and so on.

Switching power supply is a power supply that uses modern power electronic technology to control the time ratio of switching on and off and maintain a stable output voltage. Switching power supply is generally composed of pulse width modulation (PWM) control IC and MOSFET. Switching power supply products are widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, power equipment, instrumentation, medical equipment, semiconductor refrigeration and heating and other fields.