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| Number | Title | Issue Date |
| 8159841 | Low harmonic rectifier circuit A method, device, and plurality of circuit enhancements for a rectifier system that enable reduction in lower order and higher order harmonics, without substantially reducing the rectifier's direct current output voltage. The rectifier system comprises a phase shift... | 04/17/2012 |
| 8027177 | Isolated switching power supply apparatus A transformer includes a first secondary winding, a second secondary winding, and a third secondary winding. The second secondary winding and the third secondary winding are wound to include the same number of turns and to have opposite magnetic polarities. A low-pa... | 09/27/2011 |
| 7821799 | Ripple reduction for switch-mode power conversion A power converter includes an isolated or a nonisolated current-doubler rectification circuit including two magnetic circuit elements, each magnetic circuit element formed with a primary winding and a voltage-sensing winding. The primary windings are coupled in seri... | 10/26/2010 |
| 7787268 | Power switching system to increase induction heating to a load from available AC mains power In one aspect, the invention provides a power system for providing power to a load. In some embodiment, the system comprises: a rectifier configured to rectify an AC main signal to produce a rectified AC main signal; a zero cross detector configured to receive the A... | 08/31/2010 |
| 7593244 | Limit for the harmonics of a current A wiring arrangement and an appliance for limiting the harmonics of a current supplied to a frequency converter from an AC electricity supply network, which frequency converter can be connected to a three-phase AC electricity supply network, in which frequency conve... | 09/22/2009 |
| 7385438 | Active filter for reduction of common mode current An active filter for reducing the common mode current in a pulse width modulated drive circuit driving a load said drive circuit comprising an a-c source, a rectifier connected to said a-c source and producing a rectified output voltage connected to a positive d-c b... | 06/10/2008 |
| 7382112 | Methods and devices for input waveform control in switching power supplies The invention recognizes that filter size can be reduced substantially as power factor is permitted to deviate below unity in systematic ways. Preferred methods of the invention provide specific, computable waveforms that permit use of a minimum filter size given a ... | 06/03/2008 |
| 7372711 | Circuit and method for reducing voltage spikes due to magnetizing current imbalances and power converter employing the same For use in a power converter having parallel power trains, a circuit for, and method of, reducing voltage spikes due to magnetizing current imbalances in the power trains and a power converter incorporating the circuit or the method. In one embodiment, the circuit i... | 05/13/2008 |
| 7362162 | Line filter The invention is directed to a network filter that comprises at least one phase input and a protective conductor in which each phase input is connected via a filter inductance to a corresponding phase output, in which the input side of each filter inductance is conn... | 04/22/2008 |
| 7356626 | Method and device for signal protection Method for decreasing the existence of externally detectable revealing signals, so-called {umlaut over (R)}ÖS, from keyboards (1), e.g. for computers, where the keyboard is fed with signals, so-called matrix signals, which are detected for detection of activ... | 04/08/2008 |
| 7330011 | Motor driving apparatus A motor driving apparatus includes an inverter circuit for converting an output of a rectifier circuit connected to a single-phase AC power supply into a driving voltage, and outputting the driving voltage to a brushless motor, and an inverter control unit for contr... | 02/12/2008 |
| 7209024 | Filter circuit and power supply unit The present invention provides a filter circuit realizing reduction in the number of magnetic cores on a circuit board and a space occupied by the magnetic cores, and a power supply unit using the filter circuit. A filter circuit includes a first filter part and a s... | 04/24/2007 |
| 7206182 | Negative ions generating circuit design with decreasing high frequency noise and apparatus thereof A negative ions generating circuit design with decreasing high frequency noise includes a power indication circuit, an oscillation circuit, an amplifying circuit and a radial frequency filtering circuit. The power indicating circuit, the oscillation circuit and the ... | 04/17/2007 |
| 7199692 | Noise suppressor A noise suppressor capable of obtaining a favorable attenuation characteristic even in the case where a plurality of inductors on a conductive wire are magnetically coupled to each other. The noise suppressor includes a first inductor and a second inductor which are... | 04/03/2007 |
| 7200015 | Automatic capacitor discharge for power supplies In a DC power supply or a battery charger, plural output filter capacitors remain highly charged after the load is removed and the converter is turned off. A transistor connected across the capacitors is non-conductive during normal power supply operation and a blee... | 04/03/2007 |
| 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 |
| 7187229 | Active filter for reduction of common mode current An active filter for reducing the common mode current in a pulse width modulated drive circuit driving a load, said drive circuit comprising an a-c source, a rectifier connected to said a-c source and producing a rectified output voltage connected to a positive d-c ... | 03/06/2007 |
| 7129677 | Vector controller, a polyphase synchronous rectifier, and a method of vector-controlling thereof A vector controller for a polyphase synchronous rectifier, a method of vector-controlling a polyphase synchronous rectifier, and a synchronous rectifier incorporating the vector controller or the method. In one embodiment, the vector controller includes: (1) an inpu... | 10/31/2006 |
| 7123491 | AC-DC converting device, and electrical apparatus provided with AC-DC converting function An AC adaptor has a switching regulator for converting alternate current to direct current. Filters are provided to filter conducted noise, and a filter switcher switches to the filter to be used in the AC adaptor. A detector detects power consumption state of an el... | 10/17/2006 |
| 7088596 | Switching power supply with novel common mode filter arrangement The present invention is to provide a switching power supply device for preventing the change of characteristic of the line filter due to filler such as resin which covers the circuits. A switching power supply device is disclosed which comprise a rectifier 1... | 08/08/2006 |
| 7084604 | Speed sensorless control of an induction machine using a PWM inverter with output LC filter A method of controlling of an induction machine using an inverter is disclosed with output LC filter. The method includes determining an inverter output current vector (iA), determining an inverter output voltage vector (uA), and ... | 08/01/2006 |
| 7057908 | Method and arrangement in connection with network inverter A method in connection with a network inverter, an LCL network filter (3) being connected between the network inverter (1) and network (2), and the network inverter being arranged to operate as an active converter of harmonic components of elect... | 06/06/2006 |
| 7057375 | Power factor correction A circuit (1) used for power factor correction, corresponds to a known circuit that includes a high-frequency frequency source (15) for generating a high-frequency voltage (Uf) for a pump capacitor (14). The high-frequency voltage source (15 | 06/06/2006 |
| 7027314 | Filtering device for converting electrical energy A device for converting electrical energy at a high operating frequency, supplied by an electrical network having a capacitor placed between a line and an earth of the device, the capacitance of the capacitor being such that the high-frequency noise is filtered and ... | 04/11/2006 |
| 7023171 | Integrated inverter for driving multiple electric machines An electric machine drive (50) has a plurality of inverters (50a, 50b) for controlling respective electric machines (57, 62), which may include a three-phase main traction machine (57) and two-phase accessory machines... | 04/04/2006 |
| 7019994 | Switched-mode power supply with a damping network The switched-mode power supply contains a transformer, a switching transistor in series with the primary winding of the transformer, and a damping network on the secondary side, which has a connection for a further secondary winding via which energy is transferred f... | 03/28/2006 |
| 7016205 | Ripple-current reduction schemes for AC converters An AC ripple current reduction circuit for an AC converter having: an AC voltage source at the input; a first capacitor across which the circuit output voltage is provided; a first, main inductor in series with the first capacitor and the input; an auxiliary circuit... | 03/21/2006 |
| 7009482 | Controlled inductance device and method Improved inductive apparatus having controlled core saturation which provides a desired inductance characteristic with low cost of manufacturing. In one embodiment, a pot core having a variable geometry gap is provided. The variable geometry gap allows for a “step... | 03/07/2006 |
| 6989998 | Method of determining a required inductance-current relationship for an inductor A method of determining the inductance required to maintain the amplitudes of harmonic current waveforms in a rectifier circuit below a predetermined level includes a rectifier circuit that has an inductor and a capacitor. The circuit draws power from a varying powe... | 01/24/2006 |
| 6972976 | Compensation method for a voltage unbalance The invention relates to a method for compensating for a voltage unbalance in an electrical network, which is fed by using an apparatus based on controlling a flux linkage vector or a voltage vector. Concerning the apparatus based on controlling the flux linkage vec... | 12/06/2005 |
| 6965290 | Low harmonic rectifier circuit Non-linear inductor(s) are used to reduce the percent total harmonic distortion of the harmonics in the line currents in the input side rectifier system of an ac drive system. Several constructions for the non-linear inductor(s) are described. The non-linear inducto... | 11/15/2005 |
| 6963302 | DC/DC converter A method of controlling a switching element in a switching regulator power supply of a radar. The method of controlling the switching element comprises only switching the switching element during predetermined time intervals, the predetermined time intervals advanta... | 11/08/2005 |
| 6958666 | Filtering circuit and power supply device equipped with same The invention provides a filter circuit comprising inductors (6, 15) and capacitors (11) interconnected to form filter stages, the capacitors (11) being distributed over at least two printed circuit cards (7, 8) disposed facing each other... | 10/25/2005 |
| 6847530 | Low output noise switched mode power supply with shieldless transformers A switched mode power supply which uses a shieldless transformer (11) in the dc to dc converter. Common mode switching noise is reduced by connecting two capacitors (17, 18) in series between the transformer primary (12) and secondary (13... | 01/25/2005 |
| 6816394 | Approximated sinusoidal waveform inverter A DC-to-AC inverter includes a switch stage having a switch output, a switch controller coupled to the switch stage, and a filter coupled to the switch output. The switch stage includes switch means coupled to the switch output for switching the switch output betwee... | 11/09/2004 |
| 6794929 | Active filter for reduction of common mode current An active filter for reducing the common mode current in a pulse width modulated drive circuit driving a load, said drive circuit comprising an a-c source, a rectifier connected to said a-c source and producing a rectified output voltage connected to a positive d-c ... | 09/21/2004 |
| 6781444 | Active common mode EMI filter, including series cascaded filter with reduced power dissipation and transistor voltage rating An active EMI filter for reducing common mode noise current in a circuit, comprising: at least one transistor stage, each having two transistors, a current sensor coupled to the circuit and an output driving the transistor stage, a capacitor coupling the transistor ... | 08/24/2004 |
| 6765811 | Method in the design for a power supply for suppressing noise and signal interference in equipment A new method in the design for an electronic power supply for suppressing signal interference in equipment of an electronic system due to ground current in a ground loop is provided. In a power supply comprising a transformer, a primary circuit, a secondary circuit,... | 07/20/2004 |
| 6714428 | Combined transformer-inductor device for application to DC-to-DC converter with synchronous rectifier An active clamped-mode DC-to-DC converter with synchronous rectifiers and a combined transformer-inductor device is provided. The power converter includes a combined transformer-inductor device having a primary winding, a secondary winding, and an auxiliary winding ... | 03/30/2004 |
| 6700801 | Switching power supply capable of ac to dc conversion A switching power supply capable of translating a.c. voltage of sinusoidal waveform into d.c. voltage, having a rectifier circuit connected to a pair of a.c. input terminals for rectifying the incoming commercial a.c. voltage. A first main switch is conne... | 03/02/2004 |
