A design method of multi-output forward converter with low crossover regulation
Article
Figures
Metrics
Preview PDF
Reference
Related
Cited by
Materials
Abstract:
The multi-output forward converter has many advantages, including simple structure, high reliability, and wide application, but there is a problem of cross regulation. To fundamentally improve the cross regulation rate, a target average current control strategy was proposed. Firstly, the real-time load was obtained by sampling the real-time voltage and real-time current of each output terminal with ARM-STM32(Acorn RISC Machine - STMicroelectronics 32). Then the target average current was calculated by combining the real-time load with the expected output voltage. According to the target average current and the hardware parameters of the multi-output forward converter, the conduction time of the main circuit switching transistor and each secondary side rectifier switching transistor was calculated. The program automatically controlled the conduction time of each switching transistor to achieve the goal that the average output current of each output circuit equals the target average current. The experimental results show that the multiple output forward converter using output average current control has a cross regulation rate of less than 1.6%. The multiple output forward converter controlled by this strategy can not only achieve a low cross regulation rate, but also has a higher voltage accuracy.
