Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 7957166 | Variable speed drive Systems and methods for improved Variable Speed Drives are provided. One embodiment relates to apparatus for common mode and differential mode filtering for motor or compressor bearing protection when operating with Variable Speed Drives, including conducted EMI/RFI... | 06/07/2011 |
| 7952899 | Alternating voltage generator equipped with a current limiting device The invention relates to an alternating voltage generator (10) comprising a direct voltage source (20) that supplies a power bus, a bus capacitor (11) connected to the power bus, an inverter module (30) supplied by the power bus and equip... | 05/31/2011 |
| 7855903 | System and method for programming an internal parameter or feature in a power converter with a multi-function connector A programmable parameter or feature is provided for a power converter through a multi-function connection on the converter controller. The parameter or feature selection is active for programming during a startup mode, and the connection is used for other control pu... | 12/21/2010 |
| 7764524 | Inverter for driving a load including a capacitive element in an input stage The present invention provides an inverter with a simple configuration capable of preventing occurrence of excessive rush current. A current detection circuit detects an AC output current flowing out from an output filter circuit. When the absolute value of the AC o... | 07/27/2010 |
| 7613019 | Method and apparatus to limit maximum switch current in a switch of a switching power supply Techniques are disclosed to limit the current in a switch of a switching power supply. An example switching regulator circuit includes a switch to be coupled to an energy transfer element. A controller is coupled to the switch to control switching of the switch. A c... | 11/03/2009 |
| 7561450 | Protection device for a converter and related method A protection device for a converter includes at least one power switch that operates for a first time period from the time the overload or short-circuit in the converter has been detected. The protection device includes circuitry to control the power switch to minim... | 07/14/2009 |
| 7489531 | Inverter with improved overcurrent protection circuit, and power supply and electronic ballast therefor An inverter (100) comprises first and second input terminals (102,104), an inverter output terminal (106), a series arrangement of a first inverter transistor (110) and a second inverter transistor (120), a driver circuit (130 | 02/10/2009 |
| 7443698 | Converter circuit for switching of a multiplicity of switching voltage levels A converter circuit is disclosed for switching of a multiplicity of switching voltage levels, which have n first switching groups for each phase (R, S, T), with the n-th first switching group being formed by a first drivable bidirectional power semiconductor switch ... | 10/28/2008 |
| 7440297 | Fault detection for loss of feeback in forced switching power supplies with power factor correction A device corrects the power factor in forced switching power supplies and includes a converter and a control device to obtain a regulated voltage on an output terminal. The control device comprises an error amplifier having an inverting terminal (Vout) and a non-inv... | 10/21/2008 |
| 7414867 | Power conversion device An insulated gate bipolar transistor and a protective circuit are incorporated. The protective circuit has first and second Zener diodes connected in series in directions opposite to each other between the gate and the current sense terminal of the insulated gate bi... | 08/19/2008 |
| 7405953 | Driving circuit for power switching device A driving circuit has a p-channel transistor and an n-channel transistor. A power switching element is set at an on state each time the p-channel transistor sets a charging line at a conductive state in response to a leading edge of an output pulse to supply a posit... | 07/29/2008 |
| 7372233 | Method for operation of a converter circuit for a washing machine or a washer/drier, converter circuit, and washing appliance or washer/drier A method is provided for operating a converter circuit, in particular a pulse-width modulated frequency converter circuit having a DC voltage intermediate circuit, which controls two or more winding sections of a polyphase dynamo-electrical machine, in particular a ... | 05/13/2008 |
| 7362557 | Method, apparatus and article for bi-directional DC/DC power conversion A controller implements a state machine for operating the bi-directional power converter with a flexible load pattern while maintaining a thermal condition of the power converter within acceptable limits. The state machine implements a wait loop in response to selec... | 04/22/2008 |
| 7359221 | Power supply for use in an electronic energy meter A three-phase electronic electricity meter that includes a power supply circuit operable to create a constant voltage output when receiving a variable voltage input. The power supply circuit of the electricity meter receives a three-phase line voltage and converts t... | 04/15/2008 |
| 7317316 | Apparatus and method for measuring the insulation resistance of a fuel cell system A measuring device to measure the insulation resistance (Riso) of a fuel cell system with respect to an electrical ground point comprises a resistor arrangement—formed by a series connection of reference resistors—between two load-current lines of the fuel cell ... | 01/08/2008 |
| 7312970 | Low cost surge protection A motor drive for an electric machine includes a live line, a second line, and a ground line. A surge protector includes a first varistor and a gas discharge tube (GDT) that is non-conductive below a trigger voltage and that is conductive above the trigger voltage. ... | 12/25/2007 |
| RE39926 | Arc-machining power supply with switching loss reducing element A power supply for performing arc-machining operation includes a primary rectifier connected to the commercial AC power source and an inverter coupled to the rectifier. A switching device is provided between the rectifier and the inverter. By controlling the power s... | 11/27/2007 |
| 7292460 | Converter circuit for switching a large number of switching voltage levels A converter circuit is specified for switching a large number of switching voltage levels, which has n first switching groups for each phase, with the n-th first switching group being formed by a first power semiconductor switch and a second power semiconductor swit... | 11/06/2007 |
| 7279861 | Servo control apparatus In a servo control apparatus constituted by a converter unit 3 for rectifying an AC power supply voltage to produce a DC power supply voltage, and a plurality of inverter units 5 for producing drive power supply voltages of motors from the DC power sup... | 10/09/2007 |
| 7274547 | Electrical power supply system and a permanent magnet generator for such a system An electrical power supply system including an engine driven permanent magnet generator (11) operable to produce a variable voltage and high frequency output which is converted by a series train AC/AC conversion circuit (14) into a fixed voltage and re... | 09/25/2007 |
| 7262979 | Current source wave voltage inverter voltage-clamping and soft-switching techniques, and fuel cell system using the same A current-source sine-wave voltage inverter for converting a direct current (DC) voltage to an alternating (AC) voltage includes a DC source for providing a DC voltage, a current source circuit having a primary side inductance of a transformer, a clamping circuit, a... | 08/28/2007 |
| 7247955 | PWM power supplies using controlled feedback timing and methods of operating same A closed loop power converter circuit of a UPS or other power supply includes a pulse width modulator circuit in a forward path of the closed loop power circuit. A compensation circuit provides pulse width commands to the pulse width modulator at a first rate. A fee... | 07/24/2007 |
| 7227325 | Method and arrangement for protecting a frequency converter A method and an arrangement for protecting a frequency converter in a system comprising a motor and a frequency converter supplying it via a bipolar or multipolar supply connection, the arrangement comprising first connecting means adapted to couple poles of the sup... | 06/05/2007 |
| 7221858 | Pulse-width modulation motor speed control circuit A PWM motor speed control circuit (10) includes a PWM signal generator (20), a driver integrated circuit (IC) (101) and a photocoupler (30) coupled between the PWM signal generator and the driver IC. The photocoupler receives an original ... | 05/22/2007 |
| 7215180 | Constant voltage circuit A constant voltage circuit is disclosed that includes an output control transistor and an overcurrent protection circuit. The overcurrent protection circuit includes a proportional current generation circuit part, a current division circuit part, a division ratio co... | 05/08/2007 |
| 7208883 | Current detection circuit, and power supply apparatus, power supply system and electronic apparatus using the current detection circuit In the current detection circuit that detects the output currents of a switching power supply circuit, an improved current detection circuit makes it possible to detect the output current directions of power supplies solves the malfunction of the power supplies vibr... | 04/24/2007 |
| 7196503 | Current averaging circuit for a PWM power converter A current averaging circuit for averaging a piecewise linear switching current waveform of a PWM power converter including first, second and third sample and hold circuits and a sample averaging circuit. The first sample and hold circuit samples a short duration of ... | 03/27/2007 |
| 7190599 | Method for determining output currents of frequency converter A method for determining output currents of a three-phase frequency converter comprising a voltage intermediate circuit and three power switch pairs constituting an output of the frequency converter, wherein the power switches constituting a pair are coupled in seri... | 03/13/2007 |
| 7177131 | Control circuit of power supply with selectable current-limiting modes The present invention discloses a control circuit of power supply with selectable current-limiting modes, wherein the control circuit which maintains the power-output circuit of the power supply within the energy-limiting standard is performed with automatic detecti... | 02/13/2007 |
| 7177168 | Power converting apparatus and power generating apparatus AC module makers must prepare two types of AC modules for the 100-V and 200-V outputs only for domestic supply. For foreign countries, the makers must manufacture AC modules compatible with more system voltages. To solve these problems, the control circuit of an AC ... | 02/13/2007 |
| 7162656 | Dynamic protection circuit According to one embodiment, a computer system is disclosed. The computer system includes an integrated circuits (IC), a power supply that supplies power to the IC and an over-current protection (OCP) circuit. The OCP circuit prevents the exceeding a predetermined p... | 01/09/2007 |
| 7157875 | Method and system for fail-safe motor operation An electric device includes a motor and a motor drive for commanding a torque generated by the motor. A fault control circuit detects a fault condition associated with the motor drive. Upon detection of the fault condition, the fault control circuit adjusts the torq... | 01/02/2007 |
| 7158391 | Switching power supply unit A first side circuit connected to a primary coil of a transformer includes a main switching element driving the primary coil, and a control circuit which detects an output voltage to feedback and drives and controls the main switching element so as to keep constant ... | 01/02/2007 |
| 7154240 | Load-driving device and method of driving load A device for driving a load such as an electric motor for driving a fan mounted on an automobile includes a semiconductor power FET for supplying a load current to the load, a voltage detector for detecting a load voltage, a current detector for detecting a load cur... | 12/26/2006 |
| 7122984 | Method for identifying an overload current of an electric drive The invention relates to Method to detect a sluggishness or the blocking of an electric drive (3), which is triggered via a power semiconductor component (7). The electric drive (3) can be operated in both a partial load range (PWM timing signal... | 10/17/2006 |
| 7116564 | Switching power supply unit and semiconductor device for switching power supply Overload protecting operation is performed by controlling the current peak value of a switching device 1 through the use of a comparator 8, a NAND circuit 5, and so on according to variations in feedback current being input to a feedback signal ... | 10/03/2006 |
| 7116563 | Dual mode over-current protection for switching mode power converter A control circuit for a switched mode power converter is adapted to receive a current sense signal reflecting the output current of the power converter and a feedback signal reflecting the output voltage of the power converter. The control circuit includes a first o... | 10/03/2006 |
| 7110272 | Inverter bridge controller implementing short-circuit protection scheme A fault handling system for short circuit recovery in three-phase multiple-level inverter bridges, used to drive inductive loads, which waits for either desaturation of switches or expiration of a delay period based upon an amount of time before saturated switches a... | 09/19/2006 |
| 7098108 | Semiconductor device having reduced effective substrate resistivity and associated methods A semiconductor device includes at least one device active region formed in a first surface of a semiconductor substrate, an electrical contact layer on a second surface of the semiconductor substrate, and at least one resistivity-lowering body positioned in a corre... | 08/29/2006 |
| 7099169 | DC to AC inverter with single-switch bipolar boost circuit This invention improves the performance and lowers the cost of DC to AC inverters and the systems where these inverters are used. The performance enhancements are most valuable in renewable and distributed energy applications where high power conversion efficiencies... | 08/29/2006 |
