METHOD FOR INPUT CURRENT REGULATION AND ACTIVE-POWER FILTER WITH INPUT VOLTAGE FEEDFORWARD AND OUTPUT LOAD FEEDFORWARD

摘要

An active-power filter (200) includes control circuitry (202) to combine an integrated output-voltage feedback signal (215), an input-voltage sense signal (211) and an output-load feedforward signal (214) to generate a control signal (216). An output-load subsystem (108) draws the output current from the active-power filter (102) and the output-load feedforward signal (114) indicates when current drawn by an output-load subsystem changes. In some embodiments, the output-load subsystem may draw output current from the power converter having an output current ripple at a nominal frequency, which may range, for example, between about 35 and 100 Hz. The control circuitry may include an integrator (503) to integrate the output-voltage feedback signal (513). The integrator may have a control loop bandwidth significantly less than the nominal ripple frequency to loosely regulate the output voltage while the input current drawn by the active-power filter is tightly regulated.