In order to meet the requirements of high-power,high reliability,and lightweight solid-state power amplifiers for navigation satellite systems,this paper adopts a topology scheme of phase-shifting full bridge synchronous rectification conversion circuit and flyback conversion circuit matching.A 400 W secondary power supply for satellite L-band solid-state amplifiers is designed,and the topology structure and design principle analysis of the secondary power supply are detailed.This article focuses on the analysis of transformer heat consumption.In order to better design transformer heat dissipation,this innovative scheme adopts the cooling scheme of the encapsulated main power transformer.The temperature of the encapsulated transformer is reduced from 104 ℃ to 86 ℃,and the temperature measured in the thermal balance test is 85.5℃,which shows a significant improvement in heat dissipation compared to other methods.At the same time,physical loop testing,comparative testing of electrical performance indicators,and comparative testing of thermal balance and thermal simulation were provided.The power efficiency was 92.8％,the phase margin of the loop was 42°,and the gain margin was26dB.The test results show that the designed secondary power supply not only achieves high efficiency and high power output,but also effectively achieves the first level cooling of the device,meeting the high reliability batch production requirements.
关键词
卫星导航/400W二次电源/移相全桥/变压器散热
Key words
satellite navigation/400W secondary power supply/phase shift full bridge/transformer heat dissipation
维普
万方数据