Parallel PID compensation method and device for DCDC converter

Abstract

The invention relates to a parallel PID compensation method and device for a DCDC converter, the DCDC converter comprises a voltage PID adjusting ring and a current PID adjusting ring which are connected in parallel, and the method comprises the following steps: a voltage ring adjusting step: obtaining and selecting the minimum value of an output voltage set value and an output voltage limit value as a target value, and adjusting the current PID adjusting ring; sampling a voltage value output by the DCDC converter, performing PID parameter adjustment of a voltage loop according to a difference value between the sampled voltage value and a target value to obtain a PWM control signal, and performing voltage output control; a current loop adjusting step: sampling the current value output by the DCDC converter in real time, and if the sampled current value is not greater than a preset current limit value, determining that the current PID adjusting loop has no output; otherwise, according to the difference value between the sampled current value and the current limit value, PID parameter adjustment of the current loop is carried out, and the output voltage limit value is output and updated. Compared with the prior art, quick response of constant pressure is realized, and the stability of the system can be kept.

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