Power supply unit with autonomous input power limiting
AssigneeAstec International Limited
InventorsDonald Cedrick Ongyanco, Joey De Guzman, Vincent Vicente Vivar, Ricardo Bernado Roldan, Jr., Arvin San Juan
Life of this patent
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Abstract
A power supply receives AC power and generates a DC output voltage. The power supply may be divided into a primary section that converts AC power to a relatively high DC voltage. A secondary section converts this relatively high DC voltage into a well-regulated lower DC voltage. In an embodiment, the current and/or power supplied by the primary to the secondary side is used by the secondary side in a closed-loop feedback system to limit the current drawn by the secondary side to a configurable value.
Claims18
A method, comprising:
- generating constant current adjustment based on an input power and an input power limit;
- scaling a reference current based on the constant current adjustment;
- generating an output current adjustment based on the scaled reference current;
- and
- regulating an output voltage based on an output current and the output current adjustment.
A method of regulating a secondary side output current, comprising:
- regulating an output voltage using closed-loop current feedback;
- generating a current adjustment signal based on a primary side input power and a target power limit;
- scaling a reference current based on the current adjustment signal;
- generating an error adjustment signal based on the scaled reference current;
- and
- using the error adjustment signal to limit an output current of the output voltage.
A power supply system, comprising:
- a secondary output voltage regulator that uses a closed-loop current feedback signal to produce an output voltage;
- an error adjustment signal that is based on a primary side input power and a target power limit;
- a current feedback combiner to, based on the error adjustment signal, change the closed-loop feedback signal to limit an output current;
- a constant current reference;
- and
- a constant current reference modulator to, based on the primary side input power and the target power limit, scale the constant current reference to produce the error adjustment signal.
Dependencies are inferred from the claim text.