Duty cycle controller for high power factor battery charger
AssigneeXantrex Technology Inc.
InventorThomas Unger
Life of this patent
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Abstract
A duty cycle controller apparatus for producing a duty cycle signal for controlling switching of switches of a battery charger having an AC input for receiving power and an output for supplying power to charge a battery in response to switching of the switches, while maintaining a high power factor at the AC input. The duty cycle controller apparatus includes a current command signal generator having a plurality of signal inputs for receiving a plurality of signals representing a plurality of operating conditions of the charger, a plurality of current command outputs and a processor operably configured to generate a plurality of current command signals at the current command outputs in response to respective sets of operating conditions.
Claims82
A duty cycle controller apparatus for producing a duty cycle signal for controlling switching of switches of a battery charger having an AC input for receiving power and an output for supplying power to charge a battery in response to switching of the switches, while maintaining a high power factor at the AC input, the duty cycle controller comprising:
- a current command signal generator having:
- a plurality of signal inputs for receiving a plurality of signals representing a plurality of operating conditions of the charger;
- a plurality of current command outputs;
- and
- a processor operably configured to generate a plurality of current command signals at said current command outputs in response to respective sets of operating conditions;
- a selector operably configured to select a current command signal having a lowest value and produce a lowest current command signal in response thereto;
- and
- a duty cycle signal generator having a battery current signal input, a battery voltage signal input, an AC voltage waveform input, an AC current waveform input and a duty cycle signal output, said duty cycle signal generator being operably configured to produce a duty cycle signal at said duty cycle signal output in response to said lowest current command signal, a battery voltage signal (VBATT), a battery current signal (IBATT) an AC voltage waveform signal (VAC) and an AC current waveform signal (IAC).
An apparatus for producing a duty cycle signal for controlling switching of switches of a battery charger having an AC input for receiving power and an output for supplying power to charge a battery in response to switching of the switches, while maintaining a high power factor at the AC input, the apparatus comprising:
- means for receiving a plurality of signals representing a plurality of operating conditions of the charger, said signals including a battery voltage signal (VBATT), a battery current signal (IBATT), an AC voltage waveform signal (VAC) and an AC current waveform signal (IAC);
- means for generating a plurality of current command signals in response to respective sets of operating conditions;
- means for selecting a current command signal having the lowest value to produce a lowest current command signal;
- and
- means for producing said duty cycle signal in response to said lowest current command signal, said battery voltage signal, said battery charge current signal, said AC voltage waveform signal and an AC current waveform signal.
A method of producing a duty cycle signal for controlling switching of switches of a battery charger having an AC input for receiving power and a charge output for supplying power to charge a battery in response to switching of the switches, while maintaining a high power factor at the AC input, the method comprising:
- receiving a plurality of signals representing a plurality of operating conditions of the charger, said signals including a battery voltage signal (VBATT), a battery current signal (IBATT), an AC voltage waveform signal (VAC) and an AC current waveform signal (IAC);
- generating a plurality of current command signals in response to respective sets of operating conditions;
- selecting a current command signal having the lowest value to produce a lowest current command signal;
- producing said duty cycle signal in response to said lowest current command signal, said battery voltage signal, said battery charge current signal, said AC voltage signal and said AC current waveform signal.
Dependencies are inferred from the claim text.