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US 2009/0015217 A1Published application
Power supply controller and method therefor
AssigneeSemiconductor Components Industries, LLC
InventorPaul J. Harriman
Life of this patent
Estimating the term…
Abstract
In one embodiment, a power supply controller is configured to form a reference signal that has selectable values. The power supply controller is also configured to form a feed-forward signal in response to change in the value of the reference voltage and to use this feed-forward signal control the value of an output current.
Claims19
A power supply controller comprising:
- a reference generator operably coupled to form a reference signal and configured to selectively form a value of the reference signal;
- an error amplifier operably coupled to receive the reference signal and to receive a feedback signal that is representative of an output voltage of a power supply control system, and to responsively form an error signal;
- a feed-forward circuit configured to form a feed-forward signal that is representative of a change in the value of the reference signal wherein a value of the feed-forward signal changes for a first time interval responsively to a change in the value of the reference signal;
- a first circuit configured to combine the feed-forward signal and the error signal to form a compensated signal;
- and
- a PWM channel configured to form a PWM drive signal, the PWM channel coupled to use the compensated signal to form a duty cycle of the PWM drive signal.
3 more elements
A method of controlling a power supply system having an output voltage comprising:
- coupling a PWM controller to form a PWM drive signal for controlling a value of the output voltage;
- configuring the power supply system to form a feedback signal representative of the value of the output voltage;
- configuring an adjustable reference generator to form a reference signal having a selectable value;
- coupling an error amplifier to receive the feedback signal and the reference signal and responsively form an error signal;
- coupling a feed-forward circuit to form a feed-forward signal that is representative of a change in the value of the reference signal;
- and
- configuring a first circuit to combine the error signal and the feed-forward signal to form a compensated signal that is used to control a duty cycle of the PWM drive signal.
4 more elements
A method of forming a power supply controller comprising:
- coupling an error amplifier to receive a feedback signal that is representative of a voltage external to the power supply controller and to receive a reference signal having a value that is selectable;
- configuring a feed-forward circuit to form a feed-forward signal that is representative of a change in the value of the reference signal;
- configuring a first circuit to combine the feed-forward signal and the error signal to form a compensated signal;
- and
- configuring a PWM channel to use the compensated signal to control a duty cycle of a PWM drive signal formed by the PWM channel.
2 more elements
Dependencies are inferred from the claim text.