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| Number | Title | Issue Date |
| 8154269 | Control apparatus and control method for a power factor correction power converter A control apparatus and a control method for a power factor correction power converter are provided. The control apparatus is configured to reduce the variation rate of a reference signal with a rising portion and a falling portion. When the primary winding almost c... | 04/10/2012 |
| 7956596 | Voltage control for electric power systems A limitation of the interaction between cascaded tap changers and/or between a tap changer and a shunt compensator independently of any real-time communication between the respective controllers is disclosed. Coordinated voltage control in distribution networks can ... | 06/07/2011 |
| 7884592 | Energy efficient method for changing the voltage of a DC source to another voltage in order to supply a load that requires a different voltage A system and method of use for a DC-DC conversion wherein a DC supply at one voltage is converted to a DC supply at another voltage. The DC-DC converter uses a switching circuit with a broadband transmission line transformer to change the impedance level between a s... | 02/08/2011 |
| 7723973 | Three-phase alternating current voltage regulator A three-phase AC voltage regulator is for adjusting a line voltage on transmission lines. The three-phase AC voltage regulator includes a sampling circuit, a reference-voltage circuit, a comparator, a switch, a power supply, and a compensator. The sampling circuit i... | 05/25/2010 |
| 7359219 | Power supply A power supply, including a step-up converter, a resonant converter, and control unit. The step-up converter is connected to the resonant converter; the step-up converter and the resonant converter are each connected to the primary control unit. ... | 04/15/2008 |
| 7331956 | Methods and apparatus for treating back pain Apparatus and methods for treating back pain of a patient by denervation of an intervertebral disc or a region of the posterior longitudinal ligament by the controlled application of heat to a target tissue. In one embodiment, the invention may include a procedure c... | 02/19/2008 |
| 7270658 | Systems and methods for electrosurgery Methods and apparatus for selectively applying electrical energy to a target location within a patient's body, particularly including tissue in the spine. In a method of the invention high frequency (RF) electrical energy is applied to one or more active electrodes ... | 09/18/2007 |
| 7270659 | Methods for electrosurgical treatment of spinal tissue Systems, apparatus, and methods for treating spinal tissue and other body structures in open and endoscopic spine surgery to relieve symptoms, such as neck or back pain. In particular, the present invention provides methods for the controlled heating of various tiss... | 09/18/2007 |
| 7271572 | Apparatus and methods for providing a voltage adjustment for single-phase voltage regulator operation in a three-phase power system Provided is an apparatus and method for providing a voltage reduction for single-phase voltage regulator operation in a three-phase power system. The voltage regulator includes a plurality of tap positions selectable to adjust a voltage at a load to an in-band area.... | 09/18/2007 |
| 7250743 | Voltage control system The present invention is directed at circuit for controlling a voltage applied to an output voltage terminal from a first voltage level supplied by an input voltage terminal comprising a first switch and a second switch connected in series between said input voltage... | 07/31/2007 |
| 7241293 | Electrode screen enhanced electrosurgical apparatus and methods for ablating tissue Electrosurgical methods and apparatus for the controlled ablation of tissue from a target site of a patient. The instrument includes a shaft having proximal and distal end portion and an active screen electrode on the distal end portion; a return electrode arranged ... | 07/10/2007 |
| 7243243 | Apparatus and method for measuring and controlling power consumption of a computer system An apparatus and method for measuring and controlling power consumption of a computer system utilizing sensing circuitry. The sensing circuitry simultaneously senses the power consumption for each one of various components in the computer system, including the Centr... | 07/10/2007 |
| 7175621 | Electrosurgical mode conversion system A surgical system that applies electrical energy to obtain predetermined surgical effects while improving the control of the application of the energy that is supplied by electrosurgical generators. In one embodiment, a surgical assembly interfaces with and receives... | 02/13/2007 |
| 7169143 | Methods for electrosurgical tissue treatment in electrically conductive fluid An electrosurgical probe comprises a shaft having at least one electrode terminal at its distal end and a connector at its proximal end. The electrode terminal may be spaced from a return electrode such that when the electrode terminal is brought adjacent a tissue s... | 01/30/2007 |
| 7148664 | High frequency partial boost power factor correction control circuit and method A circuit for providing power factor correction includes a boost converter circuit with a boost inductance and a power factor correction switch and a control circuit. The control circuit provides a pulse width modulated signal to control the on time of a PFC switch,... | 12/12/2006 |
| 7088081 | High frequency partial boost power factor correction control circuit and method A circuit for providing power factor correction comprising a boost converter circuit having a boost inductance and a power factor correction switch coupled in series with the boost inductance, the boost inductance and power factor correction switch being coupled acr... | 08/08/2006 |
| 7049765 | Transformer for dimmer switch or on/off switch and method of use The present invention achieves the above objects, among others, by providing, in a preferred embodiment, a transformer system for use with either a dimmer switch or an on/off switch, including: a transformer; a load connected to the transformer; a first tap connecte... | 05/23/2006 |
| 6924634 | Power supply with feed forward circuit In those conventional arts, a power supply with a voltage holdup circuit generates a peak voltage in output voltage when a switching operation is occurred, and so the quality of the output voltage is decreased and a risk of operating fault in a load apparatus. The p... | 08/02/2005 |
| 6882125 | Motor controller with position detector A motor controller includes a motor-position detector, a motor driver and a power cable having a pair of electric lines (two lines) which feeds power from the driver to the detector. The detector superimposes serial information about the motor-position to the power ... | 04/19/2005 |
| 6664771 | Power regulation of electrical loads to provide reduction in power consumption A power regulation system is coupled to an AC power source outputting an input voltage. The system has a first transformer to receive the input voltage and generate a control voltage. The system also has a second transformer that has a primary coil and a ... | 12/16/2003 |
| 6486641 | Power regulation of electrical loads to provide reduction in power consumption A power regulation system is coupled to an AC power source outputting an input voltage. The system has a first transformer to receive the input voltage and generate a control voltage. The system also has a second transformer that has a primary coil and a ... | 11/26/2002 |
| 6483281 | Low power mode and feedback arrangement for a switching power converter A low power mode and feedback arrangement for a switching power converter. Two or more main power switches, such as transistors, transfer energy from a supply to load by their opening and closing. When the load requires a relatively low power level, this ... | 11/19/2002 |
| 6404179 | Noise eliminating apparatus of high-frequency transmission system A primary winding of a first insulating transformer for balance-to-unbalance transformation is connected between the central electrode and the outer electrode of an input terminal, and windings of a noise eliminating transformer are provided within balanc... | 06/11/2002 |
| 6396248 | Versatile power flow transformers for compensating power flow in a transmission line A power flow transformer implements power flow control in a transmission line of an n-phase power transmission system, where each phase of the power transmission system has a transmission voltage. The transformer has n secondary windings, where each secon... | 05/28/2002 |
| 6380722 | Method to increase the efficiency of a power switching device A method for limiting a switching current and limiting a voltage drop across a circuit includes the steps of limiting a current sent from a power source to a switching device during a turn on time of the switching device by disposing an inductor device in... | 04/30/2002 |
| 6348782 | Uninterruptible power supply systems, voltage regulators and operating methods employing controlled ferroresonant transformer circuits An uninterruptable power supply system for producing an AC voltage from at least one of a DC power source or an AC power source includes an input terminal configured to receive an AC voltage from an AC power source, and an inverter operative to produce an... | 02/19/2002 |
| 6323618 | Excitation controller and excitation control method for stabilizing voltage in electric power system An excitation controller includes a reactive current detector for detecting a reactive current output from a synchronous machine connected, by way of a tap-changer-equipped transformer including a tap changer for changing taps of the transformer under loa... | 11/27/2001 |
| 6137277 | Static voltage regulator A static voltage regulator consists of a booster transformer, a regulator transformer, an electronic switching system and a control system. The booster transformer includes a booster primary winding and a booster secondary winding. The booster secondary i... | 10/24/2000 |
| 6087818 | Recreational vehicle voltage booster A voltage booster device for increasing the voltage level of power received by a recreational vehicle (RV) from a separate 120-volt power source includes an electrical box, a power cord and female outlet on the box, and an encapsulated transformer within ... | 07/11/2000 |
| 6005785 | Power supply circuit A power supply circuit has: a power supply filter including a coil which is inserted in series into an input line; a DC--DC converter which is connected to an output of the power supply filter and which converts an input voltage into an arbitrary output v... | 12/21/1999 |
| 5965989 | Transformer primary side lamp current sense circuit A circuit that senses a current signal in a secondary winding of a transformer by monitoring a current signal in a primary winding of the transformer. The monitored current signal contains an effective current component and a magnetization current compone... | 10/12/1999 |
| 5786684 | Apparatus and methods for minimizing over voltage in a voltage regulator A solid state voltage regulator and methods therefore are shown to include a transformer having a secondary coil, the secondary coil having a plurality of taps. A first solid state switch is connected between the regulator output and a first tap. The firs... | 07/28/1998 |
| 5773969 | DC-DC converter circuit and inductive load drive device using DC-DC converter circuit An inductive load drive device using a DC--DC converter circuit with which a high voltage is obtained by the discharge of electromagnetic energy stored in a coil to a capacitor, in which a bias is applied to the magnetic core of a coil (L) with the use of... | 06/30/1998 |
| 5656871 | Circuit arrangement for an uninterrupted power supply An uninterrupted power supply with improved circuit arrangement includes a controller, a detecting circuit and a control circuit. When the incoming AC voltage is normal and in a positive half-wave cycle, an input pin of the controller detects the actual v... | 08/12/1997 |
| 5653906 | Control system for a microwave oven, a microwave oven using such a control system and methods of making the same A control system for a microwave oven having a magnetron unit, a microwave oven using such a control system and methods of making the same are provided, the system being adapted to interconnect a power source to a transformer unit of the magnetron unit to... | 08/05/1997 |
| 5633578 | Electrosurgical generator adaptors Adaptors are provided for use with electrosurgical bipolar instruments and standard commercially available electrosurgical generators that reduce coagulum buildup and sticking on electrosurgical instruments. A first type of adaptor converts a high voltage... | 05/27/1997 |
| 5289110 | Input current responsive, tap changing transformer system A system for providing a constant current to airport or airfield signs is disclosed. The system receives input currents of varying amperages which also supply, and allow dimming of, runway or taxiway lights. According to various exemplary embodiments of t... | 02/22/1994 |
| 5283411 | Driving circuit for a microwave oven A microwave oven driving circuit for stably driving a microwave oven wherein a certain output of a magnetron can be generated by controlling a microcomputer. First and second comparing portions control a voltage supplied from a power supply portion and an... | 02/01/1994 |
| 5171948 | High frequency heating apparatus A high frequency heating apparatus includes a casing, an inverter enclosed in the casing, a magnetron supplied with high frequency voltage from the inverter, and three attachment plugs each connected to one of external power supplies of different output v... | 12/15/1992 |
| 5124874 | Protective device for electric control circuits A protective device for an electric control circuit having first and second input buses to be applied with a source voltage of low level from a commercially available source of electricity and an electrical load of low rating voltage connected between the... | 06/23/1992 |
