Poland the switching frequency of the AC-DC switching power supply module?(3)
We know that the lower the switching frequency, the smaller the switching loss, but on the other hand, with the reduction of the switching frequency, the volume of the Marine boost/buck voltage power supply equipment will be reduced to the maximum, which is not conducive to miniaturization. When the switching Marine boost/buck voltage power supply is working, due to the switching of the switching device, the magnetic core will vibrate, and the frequency range that the human ear can hear is about 20~20000Hz. In order to avoid audible noise, we usually choose to stay away from the 20 frequency KHz.
A modular power supply is a power supply that can be directly mounted on a printed circuit board and can be used for application-specific integrated circuits (ASICs), digital signal processors (DSPs), microprocessors, memories, field programmable gate arrays (FPGAs) and other Digital or analog loads provide power. Typically, such modules are referred to as load (POL) power supply systems or point-of-use power supply systems (PUPS). Due to the obvious advantages of the modular structure, modular power supplies are widely used in switching equipment, access equipment, mobile communications, microwave communications, optical transmission, routers and other communications fields, as well as automotive electronics, aerospace, etc.
2. Poland Disadvantages of choosing an AC-DC control IC with a switching frequency higher than 135K
When testing electronic and electrical equipment, the electronic and electrical equipment shall be tested for conducted interference voltage emission at its Marine boost/buck voltage power supply terminal. Although the test frequency bands of different standards are different, the test frequency bands of most products are 150K~30M. It can be seen from the lower limit of the test frequency that the operating frequency of the switching Marine boost/buck voltage power supply is close to 150K, and the more difficult it is to deal with the conducted disturbance.