Airborne high frequency switching power supply design - Power Circuit - Circuit Diagram

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The airborne high-frequency switching power supply products are specially designed for the input of AC 400Hz. This is specially designed to meet the special purposes of military radar, aerospace, ship, locomotive and missile launch. At the request of users, the development of on-board high-frequency switching power supply products for the localization of electronic weapon equipment systems, breaking the international blockade, improving the mobility of our military equipment, high performance has important significance.

There are two input modes for the power supply available on the machine: 115V/400Hz IF AC power supply and 28V DC power supply. The two input methods have their own advantages and disadvantages. The fluctuation of the 115V/400Hz power supply is small, and the withstand voltage of the device is relatively high. The 28V DC power supply is reversed. Generally, it cannot be directly supplied to the equipment components. The power supply must be isolated and regulated. Become the required DC power supply to use. The environment of the onboard power supply is relatively harsh. It must be suitable for a wide range of temperature and normal operation, and can withstand stress, vibration, humidity and other stress screening tests. Therefore, the reliability of the design of the onboard power supply has put forward higher requirements. The following mainly introduces the switching power supply developed by the 115V/400Hz intermediate frequency AC input mode. Its output voltage can be adjusted from 270 to 380Vdc, the output power is not less than 3000W, and the ambient temperature can be as wide as -40°C to +55°C. It is fully adapted to military-grade power supplies. Need.

System configuration and main circuit design

Figure 1 shows the block diagram of the whole circuit. Its design is mainly completed by two parts: boost power factor correction circuit and DC/DC conversion circuit. The 115Vac/400Hz IF AC power supply is filtered by input, and the power factor correction and boost pre-stabilization and energy storage are completed by the boost power factor correction (PFC) circuit, and then the DC/DC half-bridge conversion, high-frequency rectification filter, and output filtering are performed. The circuit and feedback control loop achieve 270 to 380Vdc adjustable output regulation performance requirements.