Small and lightweight design scheme of acdc power module

The power module is a power conversion device mounted on a PCB board with a direct-insertion welding type. It adopts a modular design of glue filling and has great advantages in terms of volume, heat dissipation, and reliability. Generally, acdc power supplies often need to meet certain safety distances, resulting in a larger circuit area for acdc parts. butacdc power moduleDue to the use of glue encapsulation, the distance between components and wiring can be reduced, the power density of the power supply is greatly improved, the occupied area is reduced, and the product volume is reduced.

In recent years, electronic products tend to be miniaturized, but the power supply occupies a large part of the volume and weight. The main reason is that the transformer, control IC, MOS tube, diode, capacitor, etc. in the power supply are indispensable components of the circuit. If you want to further reduce the size or weight of the power supply, it can only be changed by adopting new measures or new technologies.

Compared with the traditional secondary-side feedback optocoupler plus TL431 structure, the primary-side feedback (PSR) acdc control technology developed in the past 10 years has a major advantage in that it eliminates these two chips and a set of working with them. The components save the space on the system board, and reduce the circuit cost on the basis of ensuring reliability.

There is also a new solution for synchronous rectification that uses power MOSFETs with extremely low on-resistance to replace rectifier diodes to reduce rectification losses. The turn-on loss of MOS tubes will be greatly reduced. A heat sink is required.

At present, under the dominance of the market, switching power supplies are becoming smaller, lighter, efficient, low-cost, and highly reliable. In order to meet the requirements of the market and electronic equipment, small and light power solutions must be used.