Class 318/441 - A.C. and D.C.

Subclass of Class 318 - Electricity: motive power systems
Definition: Subject matter in which one or more of the sources are an
No. of patents: 24
Last issue date: 11/08/2011

Number	Title	Issue Date
8054025	Charge control device and electrically driven vehicle Commercial AC voltage applied to an input terminal (90) from a commercial power supply external to the vehicle is boosted by a transformer (86) to a voltage level higher than the voltage (VB) of an electricity storage device (B) to be applied to neutra...	11/08/2011
7932688	Cleaner and method for driving the same A cleaner that can be operated at motive force of sufficient strength by using a battery voltage as well as by using a AC voltage. The cleaner uses a low-resistance-mode motor to rotate a collecting fan. The low-resistance-mode motor is driven by a motor driver. The...	04/26/2011
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
7122991	Power conversion and vehicle A power conversion system for converting a dc voltage to a pulsed ac voltage includes a dc voltage source providing three or more electric potentials, and a switching circuit arranged to connect one of the potentials selectively to an output terminal. A controller p...	10/17/2006
6930460	Load driver with power storage unit In a load driving arrangement, electric power is supplied from an auxiliary battery to a main power supply when the power stored by charging in the main power supply is scarce at the startup of the system. The power is supplied to the main power supply by closing re...	08/16/2005
6600282	Circuit and method for preventing erroneous opening and closing in an automatically/manually foldable portable radio phone Disclosed is a circuit and method for preventing erroneous opening and closing caused particularly, by use of a DC motor in an automatically/manually foldable portable radio terminal having a main body and a sub-body rotatable with respect to the main bod...	07/29/2003
6580239	Protecting device of electromobile A protecting device of an electromobile has a control device to control the rotating speed of a motor on the basis of an accelerator signal, a brake signal, and output signals from an encoder sensor, a commutation sensor, and a phase current detector, whi...	06/17/2003
6448732	Dual mode portable suction cleaner A vacuum cleaner operates via power supplied from either an on-board battery or an AC power outlet. When the vacuum cleaner is operating by using the battery a controller monitors the voltage level in the battery and automatically shuts down the vacuum cl...	09/10/2002
6384558	Driving device for motor-driven compressor A driving device for a motor-driven compressor including: (a) a motor-driven compressor for compressing a refrigerant; (b) a DC power supply serving as a power source of the compressor; (c) a capacitor connected in parallel with the DC power supply; (d) a...	05/07/2002
6329785	Pulse width modulated controlled induction motor A commercial application for a four-step switching PWM single phase AC controller for a load such as an induction motor or the like has a digital microcontroller for PWM signal generation and enhanced MOSFET switching control, and provides a multiplicity ...	12/11/2001
6256977	Start circuit for electric starting of engines A start circuit controlled by an electronic control unit for providing power from one or both of a battery and TRU in parallel to a starter motor coupled to a gas turbine engine. The circuit includes contactors between the TRU and battery and a junction w...	07/10/2001
5821476	Device for emergency operation of an elevator motor Device (100) for rotating an elevator motor during an emergency situation, such as a power failure, comprising a d.c. supply (4) and a rotary switch (8) used as a switching device for supplying a d.c. voltage into the windings (R-S, R-T, S-T) of the eleva...	10/13/1998
5629592	Electric vehicle control device in both an alternating current section and a direct current section While an electric vehicle is traveling in a DC section, a ripple component detecting unit detects a ripple component appearing on a filter capacitor voltage and adds the ripple component onto an inverter frequency reference in such manner as to cancel an ...	05/13/1997
5262704	Protection circuit in inverter for refrigerators The present invention is an inverter for a portable refrigerator. The inverter includes a square wave generator operable by a DC voltage source. A timer is also included which, in conjunction with the square wave generator, provides a multiple phase wavef...	11/16/1993
5200644	Air conditioning system having battery for increasing efficiency An air conditioning system comprises a converter for converting a commercial AC into DC, an inverter for reconverting the DC into an AC having a predetermined frequency corresponding to an air conditioner load, a compressor driven with the AC from the inv...	04/06/1993
5099186	Integrated motor drive and recharge system A drive and recharge system is disclosed that includes a bidirectional dc power source, two voltage-fed inverters, two induction motors, and a control unit. In the drive mode, power is bidirectionally connected between the dc power source and the motors. ...	03/24/1992
4904880	Automatic door driving system An automatic door driving system is disclosed, which can electrically perform automatic door opening/closing operation in case of emergency, i.e., occurrence of a fire, or power stoppage and effect automatic door opening/closing control according to the p...	02/27/1990
4641234	A-C or D-C to D-C converter for dual current locomotives with D-C motors The present invention relates to supplying a load either from a direct-current source or from an alternating-current source. The power unit, according to the invention, is characterized in that it consists of a single conversion unit (CV) having unidirect...	02/03/1987
4607198	Wiper driving apparatus A wiper driving apparatus comprises a speed reduction gear train mounted on a drive shaft of a motor which drives reciprocally and pivotally a wiper blade; a pin member operatively engaged with said gear train so as to move once every rotation of the gear...	08/19/1986
4423364	Electric motor damper drive with backup power pack An electric damper motor drive with a backup power pack is disclosed comprising a reversible electric motor operable in first and second opposite directions in response to first and second distinct forms of electrical energization, respectively. A primary...	12/27/1983
4345196	Speed control device for sewing machines An electric sewing machine has an A.C. driving motor controlled by a triac; a controlling circuit for the triac includes a thyristor powered by a lower-voltage battery via an adjustable RC-circuit; the controlling circuit is electrically insulated from th...	08/17/1982
4088937	Control apparatus Four thyristors are interconnected into an AC bridge circuit. With an AC source connected across inputs to the bridge circuit, a DC motor is connected across outputs of the bridge circuit while the thyristors are operated in the phase control mode to cont...	05/09/1978
3940680	A.C. - D.C. power converter for D.C. load A power converter which can operate with both a D.C. power source and an A.C. power source for supplying electric power to a D.C. load such as a D.C. motor. The power converter comprises thyristors, a diode, a reactor and a capacitor. A plurality of serie...	02/24/1976

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Class 318/441 - A.C. and D.C.