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Class Information
Number: 327/531
Name: Miscellaneous active electrical nonlinear devices, circuits, and systems > Specific identifiable device, circuit, or system > With specific source of supply or bias voltage > Fluctuating or ac source with rectifier or filter
Description: Subject matter wherein the power supply is converted from an alternating or fluctuating input voltage or current to a direct current or voltage via a rectifier circuit or is smoothed or integrated by a filter circuit.

Sub-classes under this class:

Class Number Class Name Patents
327/533 With battery connected across rectifier 9
327/532 With particular filter circuit 48

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8710905 Bias voltage generating circuit and switching power supply thereof Apr. 29, 2014
8487691 AC noise suppression from a bias signal in high voltage supply/low voltage device Jul. 16, 2013
8461914 Reference signal generating circuit Jun. 11, 2013
8368789 Systems and methods to provide reference current with negative temperature coefficient Feb. 5, 2013
8208590 Filter circuit, and receiver and electronic device using the same filter circuit Jun. 26, 2012
7944273 Active filtering May. 17, 2011
7901546 Monitoring methods, systems and apparatus for validating the operation of a current interrupter used in cathodic protection Mar. 8, 2011
7830151 Electronic voltage supply method and apparatus Nov. 9, 2010
7821323 Bias circuit for a switching power supply Oct. 26, 2010
7755400 Systems and methods of digital isolation with AC/DC channel merging Jul. 13, 2010
7692469 Voltage sense circuit and method therefor Apr. 6, 2010
7616047 Transistor arrangement for rectifier and inverter Nov. 10, 2009
7532017 Detection of presence or absence of AC maintain power signature in power-over-ethernet system May. 12, 2009
7511558 Semiconductor devices utilizing double gated fully depleted silicon on insulator MOS transistors Mar. 31, 2009
7501885 Filter circuit Mar. 10, 2009
7471137 Frequency-independent voltage divider Dec. 30, 2008
7443229 Active filtering Oct. 28, 2008
7385436 Fully depleted silicon on insulator semiconductor devices Jun. 10, 2008
7256638 Series active filtering power line conditioner Aug. 14, 2007
7205831 Noise filter circuit Apr. 17, 2007
7161415 Current modulation filter Jan. 9, 2007
7078937 Logic circuitry powered by partially rectified ac waveform Jul. 18, 2006
7034604 Communications device powered from host apparatus Apr. 25, 2006
6870417 Circuit for loss-less diode equivalent Mar. 22, 2005
6781432 Control circuit of MOSFET for synchronous rectification Aug. 24, 2004
6741103 Device using a detection circuit to determine whether an output current thereof is source-induced or load-induced, and method therefor May. 25, 2004
6696882 Transient override circuit for a voltage regulator circuit Feb. 24, 2004
6605980 Synchronous rectifier circuit Aug. 12, 2003
6522182 Integrated circuit device incorporating DLL circuit Feb. 18, 2003
6445221 Input driver for a differential folder employing a static reference ladder Sep. 3, 2002
6411155 Power integrated circuit Jun. 25, 2002
6404268 Circuit for simulating zero cut-in voltage diode and rectifier having zero cut-in voltage characteristic Jun. 11, 2002
6404267 High side MOSFET drive Jun. 11, 2002
6400205 Diode detection circuit Jun. 4, 2002
6351162 Circuit arrangement for controlling an inductive load Feb. 26, 2002
6285239 Feed-forward biasing for RF amplifiers Sep. 4, 2001
6271712 Synchronous rectifier and method of operation Aug. 7, 2001
6229366 Off-line converter with integrated softstart and frequency jitter May. 8, 2001
6163201 Circuit for supplying a load with a direct voltage Dec. 19, 2000
6163204 Fast AC sensor for detecting power outages Dec. 19, 2000
6163205 Charge pump Dec. 19, 2000
6140863 Power-generation detection circuit for use in an electronic device and power-generation detection method and power consumption control method for use in connection therewith Oct. 31, 2000
6127880 Active power supply filter Oct. 3, 2000
6107851 Offline converter with integrated softstart and frequency jitter Aug. 22, 2000
6100750 Frequency-independent voltage divider Aug. 8, 2000
6081150 Voltage control type control apparatus capable of achieving correct control characteristic without increasing interface line number Jun. 27, 2000
6072356 Apparatus for deriving a trigger signal from the AC line Jun. 6, 2000
5929692 Ripple cancellation circuit with fast load response for switch mode voltage regulators with synchronous rectification Jul. 27, 1999
5825214 Integrated circuit arrangement with diode characteristic Oct. 20, 1998
5812014 Double half-wave rectifier circuit having a wide input dynamic range Sep. 22, 1998

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