Control circuits for power converters

摘要

A control circuit for controlling one or more power switches of a power converter includes a voltage control loop and a current control loop. The control circuit is configured to generate a current reference for the current control loop using the voltage control loop and an AC reference signal. The control circuit is configured to operate in at least a first mode in which a parameter of the voltage control loop is sampled only at every other zero crossing of the AC reference signal and the sampled parameter is used to generate the current reference for the current control loop. The power converter may be an AC-DC converter or a DC-AC converter (i.e., inverter). Alternatively, the voltage control loop may be sampled at every zero crossing of the AC reference signal, and/or more frequently during transient load conditions.

主权项

1. A power converter comprising:
an inverter for coupling to a utility grid, the inverter comprising a power circuit having at least one power switch; and a control circuit for controlling the at least one power switch, the control circuit including a voltage control loop and a current control loop, the control circuit configured to generate a current reference for the current control loop using the voltage control loop and an AC reference signal, the control circuit configured to operate in at least a first mode in which a parameter of the voltage control loop is sampled only once per full cycle of the AC reference signal and the sampled parameter is used to generate the current reference for the current control loop.