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会员 An Improved Control Method for Aviation DC/DC Converter with Overshoot Suppression under Shorted Load
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  • 2017/03/01
摘要
According to the requirement of three times of rated current when the load is shorted, an improved control method of shorted-load current-limiting for aviation DC/DC converter is proposed. Based on traditional double-loop control DC/DC converter, the output voltage feed-forward (OVFF) control is introduced. The output voltage is taken as the feed-forward input signal, which is added with the output of the current controller as the modulation signal to achieve intersection with the triangle wave. Through rational design of feed-forward coefficient, it can be ensured that the output of the current controller is roughly constant when the load is shorted, which bypasses the delay effect of PI compensation network and corrects the duty cycle instantly, so the current-overshoot can be suppressed effectively. Small signal modeling shows that OVFF control practically does not affect the steady-state and dynamic characteristics of the original double-loop control system. The effectiveness of the proposed control method is verified by both simulation and experiment.
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