Research on improving the anti disturbance ability of high frequency power supply

As a kind of DC-DC power supply equipment, high-frequency power supply is developing towards digitization, integration and high-power. In the traditional high frequency power supply circuit topology, the inductance parameters at the bridge arm side are easily affected by the change of inductance current, and the DC bus voltage is easily affected by the load fluctuation. In this paper, a high-frequency power supply control method based on inductance current disturbance observer is proposed. The unmeasurable disturbance is estimated from the measurable information in the high-frequency power supply drive circuit, and then the disturbance momentum is compensated in the control algorithm to improve the anti-interference ability and dynamic response speed of the system. Through theoretical analysis and simulation analysis, it is verified that the proposed scheme can effectively improve the anti disturbance ability of high frequency power supply. Considering that the DC-DC power supply is generally nonlinear and intermittent, the total charging current ripple of DC-DC converter circuit working in Buck mode is large, and the DC bus voltage is vulnerable to fluctuations and shocks. This paper presents a DC-DC converter control strategy based on active disturbance rejection observer. The experimental results show that the scheme can reduce the total current ripple, suppress the DC bus voltage fluctuation, and improve the steady-state dynamic characteristics of the control system.