Back to results
US 8,044,651 B2Granted
Efficient PWM controller
AssigneeGrenergy Opto, Inc.
InventorsYen-Hui Wang, Chin-Yen Lin, Chia-Chieh Hung, Yu-Min Shih
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeGrenergy Opto, Inc.
InventorsYen-Hui Wang, Chin-Yen Lin, Chia-Chieh Hung, Yu-Min Shih
Estimating the term…
This patent discloses an efficient PWM controller for generating a pulse signal in response to a feedback signal, capable of operating in a normal mode or a green mode, comprising: a capacitor for building a saw-tooth signal by current integration, the saw-tooth signal having a ramp-up period and a ramp-down period; a first composite current source for the ramp-up period, detachable into a first constant current source and a first variable current source; and a second composite current source for the ramp-down period, detachable into a second constant current source and a second variable current source; wherein, the first variable current source is attached to the first constant current source and the second variable current source is attached to the second constant current source respectively in the green mode.
An efficient PWM controller capable of providing a first switching period or
An efficient PWM controller capable of operating in a first mode or a second mode according to a mode selecting signal, comprising a saw-tooth signal generator for generating a first saw-tooth signal of said first mode or a second saw-tooth signal of said second mode, wherein said first saw-tooth signal comprises a first ramp-up period and a first ramp-down period, and said second saw-tooth signal comprises a second ramp-up period and a second ramp-down period, and said second ramp-up period is longer than said first ramp-up period, and said second ramp-down period is longer than said first ramp-down period.
Dependencies are inferred from the claim text.