Abstract
Buck converter is taken as an example to research the full state space design feedback vector optimization problem. The full state space design is extraordinarily effective for the pole configuration in the closed-loop system, but when such control thought is applied to DC-DC switching converter, the actuator cannot completely execute relevant action due to the limited control action thereof or even the closed-loop system becomes unstable due to actuator saturation. 2-norm based low gain pole configuration is proposed in this article to design the full state control system without static error, and meanwhile the low gain feedback vector is designed according to the state space equation in order to ensure that the system has good starting performance, good power supply adjustment rate and good load adjustment rate. The research result shows that the low gain pole configuration can not only satisfy the system requirement, but also has better control effect than the traditional PI control, namely with better dynamic adjustment characteristic and static error adjustment characteristic; meanwhile, the overshoot, the adjustment time, etc. are obviously improved to provide reference for controller design & optimization and facilitate engineering implementation.
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