Segmented PID (Proportion Integration Differentiation) control circuit and method based on double-full-bridge converter

Abstract

The invention provides a segmented PID control circuit and method based on a double-full-bridge converter. The segmented PID control circuit comprises a sampling module, a PID1 module, a PID2 module, a PWM controller, a phase shift controller, a mode selection module, a data selection module and a driving module. In a space application scene, PID controllers with different parameters are respectively designed according to the working characteristics of a PWM mode and a phase shift mode of the double-full-bridge converter, the working mode of the circuit can be judged according to a sampling value, and the corresponding PID controllers are respectively accessed in the two modes to realize stable, rapid and accurate closed-loop control.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a segmented PID control circuit and method based on double full-bridge converters. Background technique [0002] For high-voltage and high-power space applications, the traditional isolated topology operating mode is relatively single, and cannot adapt to the application scenarios with a wide range of input and output voltages. Therefore, a dual full-bridge power topology is proposed based on the full-bridge circuit, which has a PWM mode. and phase-shift mode, and the secondary side circuit can be switched between the series mode and the parallel mode in the two modes of operation, so that the gain range of the circuit can be expanded. The change of its working mode also puts forward different requirements for the control parameters in order to achieve fast, stable and accurate control effects. [0003] The traditional control method mostly adopts PID contr...

AI Technical Summary

Problems solved by technology

[0003] The traditional control method mostly adopts PID control, and its implementation method is simple, but the parameters of the PID controller only have a good control effect for small-scale single-mode scenarios, and are lacking in wide-range, multi-mode application scenarios.

For some improved control methods, the control strategy is more complicated, and generally requires a digital controller to realize. For space application scenarios, digital circuits are easily affected by cosmic radiation and have low reliability.

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