Duty cycle controller for high power factor battery charger
First Claim
1. A battery charger apparatus comprising, an AC input, a voltage circuit including a plurality of switches through which power is supplied to a charger output for suppling power to charge a battery in response to switching of the plurality of switches, a duty cycle controller for producing duty cycle signals for controlling switching of said plurality of switches while maintaining a high power factor at the AC input, the duty cycle controller including:
- a plurality of current command signal generators including a plurality of signal inputs that receive a plurality of signals representing a plurality of operating conditions of the charger and a battery being charged and a plurality of current command outputs;
a processor that generates a plurality of current command signals at said plurality of current command outputs in response to the plurality of signals representing the plurality of operating conditions;
a selector that compares the plurality of current command signals from said current command outputs and selects a current command signal having only a lowest value and produces a lowest current command signal output in response thereto; and
a duty cycle signal generator having a lowest current command signal input, 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 producing the duty cycle signals 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).
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Accused Products
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.
46 Citations
30 Claims
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1. A battery charger apparatus comprising, an AC input, a voltage circuit including a plurality of switches through which power is supplied to a charger output for suppling power to charge a battery in response to switching of the plurality of switches, a duty cycle controller for producing duty cycle signals for controlling switching of said plurality of switches while maintaining a high power factor at the AC input, the duty cycle controller including:
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a plurality of current command signal generators including a plurality of signal inputs that receive a plurality of signals representing a plurality of operating conditions of the charger and a battery being charged and a plurality of current command outputs; a processor that generates a plurality of current command signals at said plurality of current command outputs in response to the plurality of signals representing the plurality of operating conditions; a selector that compares the plurality of current command signals from said current command outputs and selects a current command signal having only a lowest value and produces a lowest current command signal output in response thereto; and a duty cycle signal generator having a lowest current command signal input, 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 producing the duty cycle signals 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). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification