Design principles of high-reliability power adapters

　　To design a high-reliability regulated power adapter, you must do a good job in the following aspects. System design of the power adapter

　　According to the overall technical requirements of the whole machine load on the power adapter (including the type of power adapter voltage, output current, stability, ripple voltage, power failure protection, overcurrent protection, overvoltage protection, anti-electromagnetic interference, weight, size, etc.) , First of all, the main aspects that should be considered in the system design of the power adapter are:

　　①The choice of power supply adapter. There are two power supply adapters available on the machine: 400Hz, 115V AC power adapter and 28.5V DC power adapter. Both power adapters have their own advantages and disadvantages, 400Hz and 115V power adapters have small fluctuations and interference Small, but the required device withstand voltage is relatively high, while the 28.5V power adapter is the opposite. The power adapter type can be determined according to the application environment and load characteristics.

　　②Determine the system plan of the power adapter. The determination of the power adapter system plan largely determines the performance and reliability level of the power adapter. The main contents are

　　a. Choose high-reliability power adapter components;

　　b. Design the circuit diagram of the power adapter system and do the necessary tests;

　　c. Reasonable thermal design and electromagnetic compatibility design (shell design);

　　d. Other reliability design and maintainability design.

　　2. Design principles of high-reliability stabilized power adapter

　　①Choose high-performance and high-reliability power adapter components. Targeted testing of certain devices and circuits. Mastering first-hand information is a prerequisite for designing high-reliability power adapters. In this example, the US Vicor company is selected. The produced Vicor power adapter module is used as the main component. The main features of Vicor power adapter module are: using "zero current" switching technology, operating frequency up to 2MHIz, high efficiency (80%~90%), high power density (54~100W/ in3), high reliability (MTBF≥1 million hours), adapt to a wide range of input voltage changes, etc. 3②Design a regulated power adapter with special requirements. According to needs, the whole machine may propose some non-standard regulated power supplies with special requirements Adapter. For example, a fire control machine requires ±10V precision power adapter, which requires stability not greater than 0.1%, ripple voltage not greater than 2mV, and temperature coefficient not greater than 0.1mV/℃. For this reason, a high-performance linear regulator is designed The power adapter, on the basis of ±15V, performs secondary voltage regulation to obtain a precise taxi 10V stable power adapter ③Reliability design. Emphasis is placed on the design of peripheral circuits and the thermal design of the whole machine, electromagnetic compatibility design and other reliability designs.

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