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US 4,667,279 AGranted
Transformer coupled pard bucker for DC power supplies
AssigneeHewlett-Packard Company
InventorCraig P. Maier
Life of this patent
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Abstract
A noise reduction circuit for a DC power supply in which the input of a high pass filter is coupled to the output circuit of the supply so as to receive a noise signal, the output of the high pass filter is coupled to the primary winding of a transformer via an amplifier, and the secondary winding of the transformer is coupled to the output circuit of the supply so as to reduce the noise therein.
Claims3
A DC power supply in which noise appears in an output thereof, comprising
- means including a high pass filter coupled to said output for deriving a signal corresponding to the noise at said output,
- a transformer having primary and secondary windings,
- means including an amplifier for coupling said primary winding to said means for deriving a signal corresponding to the noise, and
- means for coupling said secondary winding to said output so as to reduce the noise therein.
1 more element
Dependencies are inferred from the claim text.