The switching power supply has the same power and the same voltage, but the price is quite different. Or is the workmanship different?

The same voltage,

the same power switching power supply, whether it is an ordinary indoor power

supply or rainproof power supply, the price is very different, mainly in order

to save costs, some businesses to purchase raw materials to adopt the principle

of low price, do not pay attention to the quality of components. Or form a

fierce vicious competition with peers, eliminating links that should not be

saved.

In addition to the

input voltage and power, the indicators of the power supply are also related to

the switching frequency, efficiency, load regulation, voltage regulation,

EMI/EMC, heat dissipation, power supply dynamic response speed, stability and

other issues. The efficiency is related to the performance of the power supply

devices and magnetic components used. The on-state resistance, on/off, and

voltage rise/fall times of various power MOSFETs and IGBTs are different, and

the prices will naturally vary. The size of the transformer's leakage

inductance also has an impact on efficiency, so the quality of the

manufacturing/winding process is related to efficiency and also related to

cost. EMI/EMC and thermal issues are directly related to the layout of the PCB,

the traces, and the position relationship between components. The cost of using

a single panel for small and medium-power switching power supplies will be much

lower than the cost of a double board.

In addition, volume is

also an important factor. When a good manufacturer manufactures magnetic

components, the core used will be a ferrite or powder core material with higher

saturation magnetic density, so that the volume of the power transformer and filter

inductor can be greatly reduced, the volume of the power supply will be

reduced, and the cost will rise. Guangzhou Yuxiang switching power supply is

based on the stable product quality, to win customer satisfaction and

service-oriented basis to develop business, different manufacturers are in

technology, product technology and materials are different, so resulting in

differences in product prices.