System and method for rejecting dc current in power factor correction systems
AssigneeEmerson Climate Technologies, Inc.
InventorCharles E. Green
Life of this patent
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Abstract
A power factor correction (PFC) system includes a direct current (DC) module, an error control module, an offset module, and a duty cycle control module. The DC module determines an average current value based on a plurality of current values over at least one cycle of an input alternating current (AC) line signal of the PFC system. The error control module generates an error signal based on the average current value. The offset module offsets a desired instantaneous current based on the error signal. The duty cycle control module controls at least one duty cycle of switches of the PFC system based on the offset desired instantaneous current.
Claims20
A power factor correction (PFC) system, comprising:
- a direct current (DC) module that determines an average current value based on a plurality of current values over at least one cycle of an input alternating current (AC) line signal of the PFC system;
- an error control module that generates an error signal based on the average current value;
- an offset module that offsets a desired instantaneous current based on the error signal;
- and
- a duty cycle control module that controls at least one duty cycle of switches of the PFC system based on the offset desired instantaneous current.
A method for power factor correction (PFC), comprising:
- determining an average current value based on a plurality of current values over at least one cycle of an input alternating current (AC) line signal of a PFC system;
- generating an error signal based on the average current value;
- offsetting a desired instantaneous current based on the error signal;
- and
- controlling at least one duty cycle of switches of the PFC system based on the offset desired instantaneous current.
A power factor correction (PFC) system, comprising:
- a first pair of switches;
- a second pair of switches;
- a switch controller that controls the first pair of switches using a first signal, and that controls the second pair of switches using a second signal;
- a current control module that controls the first and second signals based on a desired instantaneous current;
- a current determination module that determines a first current corresponding to the first pair of switches and a second current corresponding to the second pair of switches;
- a direct current (DC) module that calculates an average of the first and second currents over at least one cycle of an input alternating current (AC) line signal;
- an error control module that generates an error signal based on a difference between the average of the first and second currents and a desired current;
- and
- an offset module that offsets the desired instantaneous current based on the error signal.
Dependencies are inferred from the claim text.