Improving load transient response by adjusting reference current in isolated power converters

摘要

Methods and systems for improving load transient response in power conversion systems are provided herein. The system includes a primary stage and a secondary stage, an isolation barrier electrically isolating the primary stage and the secondary stage, and a primary stage controller positioned in the primary stage. The primary stage controller is configured to adjust a step-up converter reference voltage based on a load current signal indicative of a load transient. The load current signal is transmitted from the secondary stage.

主权项

1. A power converter comprising:
an isolation barrier having a primary stage side and a secondary stage side; a step-up converter positioned on said primary stage side, said step-up converter configured to condition an input voltage and generate a direct current (DC) boost voltage; a DC capacitor coupled to an output of said step-up converter; and a primary stage controller positioned on said primary stage side and coupled to said step-up converter, said primary stage controller configured to adjust a step-up converter reference voltage based on a load current signal indicative of a load transient, the load current signal transmitted from a secondary stage side of said isolation barrier, said primary stage controller configured to momentarily adjust an input current reference such that a charge rate of said DC capacitor increases to enable said power converter to provide sufficient power during the load transient.