A control method in which digital voltage loop and current loop follow each other

Abstract

The invention discloses a method for controlling mutual following of a digital voltage loop and a current loop. The method comprises the steps that when a control loop in which the current loop and the voltage loop are connected in parallel stays at a steady mode, final output of a previous control loop is assigned to previous voltage loop output when an error of the voltage loop is negative and the final output is taken as historical information of loop iterative computation; or, when an error of the current loop is negative, the final output of the previous control loop is assigned to previous current loop output and taken as historical information of the loop iterative computation; control loop calculation in a current cycle is carried out, so that calculation values of voltage and current control loops in the cycle are obtained; and the calculation values of the voltage and current control loops in the cycle are compared, and the smaller value is taken as the final output of the control loop. The method disclosed by the invention has the advantages that extra hardware addition is not needed; overshooting during switching of the voltage loop and the current loop can be reduced; smooth and rapid switching and non-overshooting switching control of the current loop and the voltage loop can be implemented; and cost competiveness and performance of power source equipment can be enhanced.

Description

technical field [0001] The invention relates to a control method, in particular to a control method in which a digital voltage loop and a current loop follow each other. Background technique [0002] The traditional double-loop control method only calculates the voltage loop and the current loop separately, and takes the smaller loop calculation as the output parts after comparison. Assuming that it is currently in a steady state mode, and the output of the voltage loop is small, the output of the voltage loop is used as the final control loop output, and the output of the current loop is at a large value or a saturated value. When the output load suddenly increases, the output voltage drops, so the loop calculation value of the voltage loop becomes larger gradually. At the same time, as the load current increases, when the output current is greater than the reference current, the loop calculation value of the current loop gradually decreases. Only when the current loop is ...

AI Technical Summary

Problems solved by technology

During this period of time, a large current or voltage overshoot will inevitably occur, which will make the equipment potentially dangerous and have a certain impact on the reliability of the equipment.

[0004] Moreover, in the traditional constant voltage output power supply with constant current function, there are current and voltage control loops in the control strategy. done quickly, resulting in large overshoots in current and voltage

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