Basically, all electronic devices are inseparable from the charger. At the beginning, the charger control chip generally used the secondary side structure SSR type. With the rapid development of PSR technology in the past two years, the development of smaller volume The power supply and charger control chip begin to use the PSR type. Compared with the SSR scheme, the PSR scheme can save the optocoupler, 431 and other components, simplify the peripheral, and be widely used.

What is PSR structure power supply: Compared with the traditional SSR scheme, it saves the optocoupler and 431, and uses the primary auxiliary winding as the sampling voltage, which saves the space on the system board, reduces the cost and improves the reliability of the system, with obvious advantages.

The main advantages of the PSR structure power supply: Compared with the SSR power supply, PSR saves the optocoupler, 431 and their peripheral components, so the volume can be made smaller and the price is cheaper. Now the chargers below 15W on the market are basically PSR structure. .

Disadvantages of PSR structure power supply: PSR uses the primary auxiliary winding as the sampling voltage. Due to factors such as the transformer technology, the consistency of the output diode, and the output parasitic resistance, the output accuracy of the PSR is low, and it is generally only used in low-power power supplies (15W within).

In summary, PSR and SSR structure power supplies have their own advantages and disadvantages. If you want to simplify peripheral applications, low-power power supplies with low performance requirements and low cost, you can use the PSR structure. If you pursue high-precision performance, it is recommended to use the SSR structure.