Class 307/128 - AC or DC discriminating

Subclass of Class 307 - Electrical transmission or interconnection systems
Definition: Subject matter having a discrimination response to alternating
No. of patents: 30
Last issue date: 03/06/2012

Number	Title	Issue Date
8129867	RF AC/DC coupling circuit using general purpose solid-state relay A system and method for overcoming the parasitic elements associated with off the shelf or general purpose solid-state devices configured to operate as RF AC/DC signal coupling networks. An AC/DC signal coupling network may comprise a general purpose solid-state rel...	03/06/2012
7898114	Protective circuit device for a solar module A circuit breaker for a solar module, wherein a plurality of solar cells working in normal operation and when shaded are connected in series. At least one controlled electrical switch element serves as a bypass element and is connected in parallel with its contact g...	03/01/2011
7755222	Method and system for high power switching According to one embodiment of the invention a method for switching an alternating current signal between at least two paths includes providing, in at least one of the paths, first and second field effect transistors in series. The method also includes providing a c...	07/13/2010
7366925	Portable power management for a computing device carrying case An apparatus, carrying case and computer system are disclosed herein. In the apparatus, a housing to which an electrical device may be electrically coupled is provided. A secondary battery may be electrically coupled to the housing and adapted to power the electrica...	04/29/2008
7224086	Universal multiple device power adapter and carry case The present invention is directed to a carrying case with an integrated power supply system for providing power to multiple electronic devices from a single power source. In addition to allowing quick access and storage of various electronic devices, the carrying ca...	05/29/2007
7221106	Cordset based appliance controller An apparatus and method for distributed control of an electrical appliance having a plug and a load and two power carrying conductors connecting the plug to the load, comprising locating power control elements completely within the plug, connecting interface element...	05/22/2007
7200176	Transformerless ethernet controller Transformerless ethernet controller. A method for isolating an ethernet controller, having a transceiver associated therewith, from a twisted wire transmission line is provided. The power supply of the transceiver is DC isolated from system power supply. The data si...	04/03/2007
7190091	Selectable source input power supply A selectable source input power supply is disclosed. According to one embodiment, a power supply is provided comprising an input stage including an input connector to couple the power supply to either of an AC input voltage or a DC input voltage, and an actuatable i...	03/13/2007
7190143	Pulse width modulation (PWM) rectifier with variable switching frequency A method for controlling a device including a plurality of switching devices operated in accordance with a pulse width modulation technique includes receiving a reference voltage signal associated with a first pair of the switching devices. A switching signal is gen...	03/13/2007
7183672	MOSFET based, high voltage, electronic relays for AC power switching and inductive loads A MOSFET based, high voltage, high current AC electronic relay includes a MOSFET switching circuit selectively switching between switch conducting and switch isolation. The relay also includes a transformer coupled to the MOSFET switching circuit, the transformer se...	02/27/2007
7111180	Information handling system interrupting current to external module if current exceeds different current limits when handling system receives current from battery and alternating current source A portable information handling system (IHS) includes an external module which derives its power from the internal unregulated DC power rail of the IHS. An IHS power subsystem includes a multiple threshold current protection circuit which continuously monitors power...	09/19/2006
7102253	MOSFET based, high voltage, electronic relays for AC power switching and inductive loads A MOSFET based, high voltage, high current AC electronic relay operating with normally closed contacts is disclosed. The relay includes at least one MOSFET switching circuit selectively switching between switch conducting and switch isolation. The at least one MOSFE...	09/05/2006
7045917	Circuit arrangement for an electric appliance A circuit arrangement for an electric appliance, having a control device and a power supply unit connected with an electric current supply connector for providing functional units, which are to be controlled, of the electric appliance with current. A switch is provi...	05/16/2006
7030515	Individually biased transistor high frequency switch A single-pole multiple-throw RF switch includes first and second FET arrangements, each having a gate and a controlled current path (CCP). One end of the CCP of each FET is connected to a common port by way of an arrangement which blocks DC flow between the FETs, bu...	04/18/2006
6973153	Transmit and receive protection circuit A transmit and receive protection circuit for use in a communication system is disclosed. The protection circuit uses a four-diode gate in which the currents through an input portion and an output portion of the diode gate are individually controlled by resistors lo...	12/06/2005
6800965	Switch input current circuit A method and corresponding apparatus for improving the power consumption of a switch input circuit is described having resistive elements, the method including the steps of providing a wetting current to at least one switch through a respective resistive element, an...	10/05/2004
6172891	AC voltage adapter with integrated DC voltage power supply connector A computer system operable on a DC voltage is provided. The computer system includes a microprocessor, a system memory coupled to the microprocessor, a bus coupled to the microprocessor, an input device coupled to the bus, and a voltage adapter system for...	01/09/2001
6133654	Inductive proximity switch with a one-piece housing An inductive proximity switch is provided which comprises a coil, means for supplying the coil with periodic transmitting current pulses, and means for processing signals which correspond to voltages induced in said coil after the end of a transmitting cu...	10/17/2000
6002289	Voltage peak switch closing method for shunt capacitor energization When energizing a shunt capacitor in a circuit that includes an ac power supply and a switch, the shunt capacitor is initially precharged to a predetermined voltage with a direct current voltage. Thereafter, the switch is closed at an instant of voltage p...	12/14/1999
5889465	Power service unit with automated dialer and other enhancements A power service unit suited for providing conditioned power to a consuming device at a remote location. The power service unit includes a charger/rectifier, a back-up power supply, together an automated dialer that contacts a central monitor in the event ...	03/30/1999
5859499	Emergency lighting system with a DC sensing load relay An emergency lighting system has emergency light units operable by DC power and connected to a source of AC and DC power by the same conduit system. Power to the conduit system may be switched from AC to DC in the event of a power failure and a load relay...	01/12/1999
5815388	Polarity reversing circuit having energy compensation A polarity reversing circuit having energy compensation may comprise a first inductor connected between the first electrode and a negative terminal of a power supply. The positive terminal of the power supply is connected to the second electrode. A diode ...	09/29/1998
5737172	Electromagnetic contactor and a method of controlling the same An electromagnetic contactor to which voltage generated through full wave rectification of an alternating current or DC voltage is loaded. The device provides control for a closing operation with a large pulse width according to a set-up frequency and con...	04/07/1998
5631504	AC/DC power supply An AC/DC power supply includes an input sensing circuit for sensing whether the input connector is connected to an AC voltage source or to a relatively lower amplitude DC voltage source. When connected to the AC voltage source, a control circuit connects ...	05/20/1997
5592030	Power supply for energizing DC load from AC or DC source A power supply for energizing a load device such as an electrical motor of a small suction/compressor pump with DC, includes an AC socket for connection to an AC supply, a rectifier, a charging circuit for charging a storage battery, a manual switch for c...	01/07/1997
5327016	Load control circuit including automatic AC/DC discernment A control circuit for switching AC or DC loads and for automatically discerning the presence of an AC or a DC power supply via a switch has been provided. The control circuit is coupled to alternately render a switch operative and non-operative wherein th...	07/05/1994
5245220	Universal power adapter for converting AC/DC voltage to DC voltage A universal power adapter comprised of a standard IEC three-wire socket, an AC/DC power supply detector circuit, an AC/DC power supply selector circuit, an AC/DC power supply pre-treating circuit, a DC power supply transformer circuit, a feedback and regu...	09/14/1993
5233230	Power cord An electrical power cord for connecting an a.c. current source to an appliance, and a d.c. current battery power pack connected to the power cord to replace a.c. current when there is a loss of a.c. current. Switches in the battery power pack provide for ...	08/03/1993
4658155	Drive circuit for a piezoelectric actuator A drive circuit for a piezoelectric actuator includes a pair of power input terminals for supplying either AC or DC power, with the piezoelectric actuator being connected between these power input terminals. A device for supplying current for driving the ...	04/14/1987
4454502	Apparatus for monitoring and signalling system Apparatus for a monitoring and signalling system such as a home health care system. The monitoring and signalling system includes a plurality of ac-based sensors powered by an ac voltage and operative to monitor the occurrence of activities performed by a...	06/12/1984

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Class 307/128 - AC or DC discriminating