Method of controlling a power converter and power converter

CN116054620BActive Publication Date: 2026-07-07DELTA ELECTRONICS INC(CN)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DELTA ELECTRONICS INC(CN)
Filing Date
2021-10-28
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

In existing technologies, when power converters use AZSVPWM, it is difficult to effectively reduce DC current ripple, resulting in a large effective value of DC side capacitor current, which increases the demand for electrolytic capacitors and product costs.

Method used

An AZSVPWM-based control method is adopted. By injecting zero-sequence voltage in an appropriate range, the positive and negative changes of voltage phase angle and three-phase current value are determined by a table. The zero-sequence voltage is synthesized to reduce DC current ripple, and the on-time of the switch is controlled to adjust the output power supply.

Benefits of technology

It effectively reduces the current ripple effect of DC-side capacitors, improves the stability and efficiency of power converters, reduces the use of electrolytic capacitors, and lowers product costs.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN116054620B_ABST
    Figure CN116054620B_ABST
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Abstract

The present application provides a control method of a power converter, which generates a three-phase output power by switching an input power through multiple switches. The control method comprises: obtaining a three-phase output command corresponding to the three-phase output power; comparing the three-phase output command with a control carrier, and obtaining a voltage phase angle corresponding to the three-phase output command according to a comparison result; obtaining three-phase current values of the three-phase output power; detecting positive and negative changes of the voltage phase angle and the three-phase current values, and determining a zero sequence voltage as a positive voltage, a zero voltage or a negative voltage; synthesizing the zero sequence voltage and the three-phase output command to obtain a three-phase output expected value; comparing the three-phase output expected value with the control carrier to obtain a conduction time corresponding to each switch; and switching the input power through the conduction time of each switch to regulate the three-phase output power.
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