Power factor correction algorithm for arbitrary input waveform
AssigneeCooper Technologies Company
InventorTraver Gumaer
Life of this patent
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Abstract
The present disclosure provides techniques for a power factor correction system having an arbitrary input waveform. The present disclosure provides two example methods of digital power factor correction that allow for a high power factor on an arbitrary input waveform. The two example methods are applicable to both constant-current inputs and constant-voltage inputs. One example method samples the arbitrary input waveform to produce a reference table used to synchronize the input voltage with the input current in a constant current system, and to synchronize the input current to the input voltage in a constant voltage system. A second example method uses instantaneous input values as a reference in performing power factor correction.
Claims20
A power factor correction (PFC) circuit for arbitrary input waveforms, comprising:
- a controller configured to receive an output signal from a PFC circuit and a reference signal, wherein the controller compares the output signal and the reference signal and produces a feedback output, wherein the controller generates an input reference data derived from an input source and multiplies the input reference data by the feedback output to produce a control signal, wherein the input source is an arbitrary periodic waveform, and wherein the control signal controls and synchronizes an input signal to be in phase with the input source.
A table method of controlling a power factor correction (PFC) circuit with arbitrary input waveforms, comprising:
- sampling an input source at fixed intervals and storing the sampled values;
- dividing each sampled value by a cycle minimum to obtain a set of normalized values;
- generating an input reference from the set of normalized values;
- multiply the input reference by a feedback controller output to obtain a control signal;
- and
- controlling a PFC circuit with the control signal, wherein the PFC circuit produces an input signal synchronized with the input source.
An instantaneous method of controlling a power factor correction (PFC) circuit with arbitrary input waveforms, comprising:
- sensing a first input power parameter;
- taking an instantaneous value of the first input power parameter at fixed intervals;
- multiplying the instantaneous value of the first input power parameter by a feedback controller output to generate a control signal;
- and
- controlling a PFC circuit with the control signal, wherein a second input power parameter is synchronized with the first input power parameters.
Dependencies are inferred from the claim text.