Control system and method for multi-phase interleaved DCDC converter

Abstract

The invention relates to the technical field of DCDC converter control, in particular to a control system and method for a multi-phase interleaved DCDC converter. A first phase of branch circuit, a second phase of branch circuit, a third phase of branch circuit and a negative bus branch circuit are controlled by the same DSP. A current detection unit test1, a current detection unit test2 and a current detection unit test3 are all in signal connection with the same DSP, and the DSP further controls a switching tube Q1, a switching tube Q2 and a switching tube Q3. The purpose of reducing corresponding ripple currents is achieved by closing an abnormal branch and improving the working frequencies of the other two branches so as to meet the ripple requirements output by an input end fuel cell,and when the DCDC converter is subjected to single-phase damage, the front-stage equipment and the rear-stage equipment of the DCDC converter can still operate normally. The problem that a front-stage power supply device and a rear-stage power utilization device of a DCDC converter are suddenly powered off due to single-phase damage of DCDC is solved.

Description

technical field [0001] The invention relates to the technical field of DCDC converter control, in particular to a control system and method for multiphase interleaved parallel DCDC converters. Background technique [0002] With the development of the new energy electric vehicle industry, pure lithium batteries, lead-acid batteries, zinc-nickel batteries, etc. are no longer enough to dominate the development of the electric vehicle industry. Hydrogen-oxygen fuel cells have become the development trend of modern electric vehicles, and the proton exchange membrane of hydrogen-oxygen fuel cells is extremely sensitive to the impact of output current fluctuations. To convert the electric energy generated by the hydrogen-oxygen fuel cell into a stable level and supply it to other electrical equipment of the electric vehicle, a DCDC is needed for voltage stabilization conversion. The performance of the interleaved parallel DCDC converter itself seriously affects the performance of ...

AI Technical Summary

Problems solved by technology

The existing interleaved parallel DCDC converter will be protected instantly when a single phase is damaged, and the input and output will form an open circuit at the same time, resulting in no power supply buffering process for the front and rear stages, which will affect the power supply and power consumption of the front and rear stages. device performance

Therefore, how to solve the problem of DCDC having no power output when a single phase is damaged, resulting in instantaneous power failure of the front and rear stages is a current research problem.

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