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| Number | Title | Issue Date |
| 6924993 | Method and apparatus for controlling a stand-alone 4-leg voltage source inverter Methods and apparatus are provided for controlling a stand-alone four-leg three-phase inverter. The inverter three-phase output is converted from AC domain elements to corresponding DC domain elements. The DC domain elements are processed into combined regulating an... | 08/02/2005 |
| 6922023 | Multiple-lamp backlight inverter An inverter for driving multiple discharge lamps. The inverter has a transformer for driving a first discharge lamp and a second discharge lamp. The inverter also includes a first balancing circuit connected in series with the first discharge lamp and a second balan... | 07/26/2005 |
| 6919742 | Fast ethernet and ethernet driver A driver circuit for driving a line in a network comprises first driving means for driving the line, second driving means for driving the line, and switching means for switching between the first and second driving means. A method for providing multi-mode driver cap... | 07/19/2005 |
| 6917528 | Switching power transmission device A switching power transmission device includes a transformer having primary and secondary windings, and two driving windings, the transformer being connected with an inductance and a capacitor. First and second switch circuits are connected to input power and the tr... | 07/12/2005 |
| 6914794 | Power conversion device A low cost power conversion device operating at a high frequency with high efficiency is realized by using semiconductor switching devices such as FETs being inexpensive and having low withstand voltages and low forward voltage drops. A second error signal obtained ... | 07/05/2005 |
| 6911787 | Driving method and driving circuit for piezoelectric transformer, cold-cathode tube light-emitting apparatus, liquid crystal panel and device with built-in liquid crystal panel There is provided a method for driving a piezoelectric transformer in which a driving efficiency and the reliability in terms of withstand power and distortion can be enhanced by suppressing a higher order vibration mode exited by a harmonic component other than a d... | 06/28/2005 |
| 6911801 | Apparatus and method for controlling inverter for driving a three-phase motor An inverter control apparatus and method of a three-phase motor includes disposing three maximum phase voltage vectors each having an equivalent angle interval corresponding to maximum values of each phase voltage; setting maximum phase voltage vector regions by pre... | 06/28/2005 |
| 6911786 | CCFL circuit with independent adjustment of frequency and duty cycle Two independent control variables, i.e. the frequency and the duty cycle of the driving waveform to an output driver, can be used to optimize the operation of a cold cathode fluorescent lamp (CCFL). The frequency of the driving waveform can be used to control the ga... | 06/28/2005 |
| 6911789 | Power supply for a hot-filament cathode In accordance with one embodiment of the present invention, there is provided a switch-mode power supply to generate the heating current for a hot-filament electron-emitting cathode. The power supply directly couples, without an output transformer, the output from a... | 06/28/2005 |
| 6909620 | Inverter configurations with shoot-through immunity An inverter phase leg with shoot-through protection that may be used in inverters includes a high side semiconductor switch and a low side semiconductor switch which are connected across DC supply lines and which have an output node between them. A series diode or c... | 06/21/2005 |
| 6909267 | Logic controlled high voltage resonant switching power supply Methods and apparatuses for a low EMI power supply. The power supply may include a control circuit, a power switch connected to the control circuit, an anti-parallel diode connected to the power switch, an inductor coupled to the anti-parallel diode, an output diode... | 06/21/2005 |
| 6909617 | Zero-voltage-switched, full-bridge, phase-shifted DC-DC converter with improved light/no-load operation A zero-voltage-switched, full-bridge, phase-shifted DC-DC converter for use in a DC power supply or battery charger includes a power transformer, four switching transistors connected to form a full bridge, and a decoupling capacitor and resonant inductor connected i... | 06/21/2005 |
| 6906931 | Zero-voltage switching half-bridge DC-DC converter topology by utilizing the transformer leakage inductance trapped energy A duty-cycle-shifted pulse-width modulation controlled half-bridge zero-voltage switching DC—DC converter has a primary side, a secondary side and a transformer coupling the primary side to the secondary side. The primary side has first and second primary switches... | 06/14/2005 |
| 6906497 | Enabling circuit for avoiding negative voltage transients An enabling circuit includes a comparison circuit configured to compare a feedback signal representative of a charge of an energy storage element of a regulating circuit with a reference charge and provide an output in response to the comparison to enable the regula... | 06/14/2005 |
| 6906481 | Power sharing high frequency motor drive modular system Methods and apparatus are provided for frequency and power scaling a drive assembly for a brushless direct current (BLDC) motor. The apparatus comprises multiple groups of half-bridge switching element assemblies connected to respective “In-Hand” phase windings ... | 06/14/2005 |
| 6900993 | Inverter controller An integrated circuit inverter controller that includes at least one input pin that is configured to receive two or more input signals. The input pin may be multiplexed so that the appropriate input signal is directed to appropriate circuitry within the controller t... | 05/31/2005 |
| 6898089 | Solid state converter for high voltages A converter for high voltages includes a bridge circuit having serially arranged switching assemblies so connected as to define at least two input notes and two output nodes. The input nodes are adapted to receive an input voltage across the input nodes, and the out... | 05/24/2005 |
| 6898095 | Bidirectional VSC converter with a resonant circuit The invention relates to a VSC-converter for converting direct voltage into auxiliary voltage and vice versa, which comprises a series connection of at least two current valves (5, 6) arranged between two poles (7, 8), a positive and a negative, of a d... | 05/24/2005 |
| 6898094 | DC/DC bridge control unit for controlling a direct-current load A DC/DC bridge having a power stage provided with controllable semiconductor switches controls a direct currently load, and comprises two bridge sections, one of which bridge sections conducts direct currently while the other bridge section is controlled via pulse w... | 05/24/2005 |
| 6885568 | Ripple free measurement and control methods for switched power converters Interfering effects of output ripple on measurement of output voltage and output current in a switched power converter may be obviated by taking sampled measurements at time points which are synchronized to the cause of the output ripple to drop out. Different wavef... | 04/26/2005 |
| 6879503 | Cutting electric power converter A cutting device for reversibly converting electric power between an alternating voltage source and an alternative current source, comprises switching cells each comprising first and second switches unidirectional in voltage and bidirectional in current. A first gro... | 04/12/2005 |
| 6867645 | Method and apparatus for providing pulse width modulation A pulse width modulation scheme allows the creation of a unipolar pulse width modulated output signal. Two switching circuits (104, 204), preferably different legs of an inverter circuit, can operate to not only modulate an input voltage but also to reverse t... | 03/15/2005 |
| 6862195 | Soft transition converter The present invention is a circuit and method for reducing switching and reverse recovery losses in the output rectifiers while creating zero voltage switching conditions for the primary switchers. There are described two output configurations, one employing a soft ... | 03/01/2005 |
| 6859372 | Bridge-buck converter with self-driven synchronous rectifiers A non-isolated bridge-buck DC—DC converter has self-driven synchronous rectifiers Q5 Q6 in the buck circuits 28 30. Gate electrodes of the synchronous rectifiers Q5 Q6 are connected to midpoints 24A 24B of the bridg... | 02/22/2005 |
| 6858996 | Driver IC for use with simple microcontrol A driver circuit for driving a switching circuit driving a load, e.g., a gas discharge lamp, the drive circuit comprising an input trigger circuit receiving a pulsed input signal for controlling the generation of two drive signals, a first drive signal driving a hig... | 02/22/2005 |
| 6856521 | Pulse width modulation soft-switching control A DC/DC converter includes a first leg and a second leg. A controller employs hard switching in the first leg to reduce the conduction loss. The controller employs zero voltage in the second leg to reduce the switching loss. ... | 02/15/2005 |
| 6856519 | Inverter controller An integrated circuit inverter controller that includes at least one input pin that is configured to receive two or more input signals. The input pin may be multiplexed so that the appropriate input signal is directed to appropriate circuitry within the controller t... | 02/15/2005 |
| 6853569 | DC to DC converter A DC to DC converter includes a switch, a diode, and a capacitor connected in series with an inductor. The capacitor and inductor provide a resonant time period and are connected in series with the switch and the diode. A control circuit provides an on/off signal to... | 02/08/2005 |
| 6853561 | Power system with zero voltage switching A DC/DC converter includes first and second bridges comprising a plurality of switch elements and a plurality of coupling capacitors. Each coupling capacitor couples one of the switch elements of the first bridge to one of the switch elements of the second bridge. T... | 02/08/2005 |
| 6847532 | System and method to eliminate the dead time influence in a pwm-driven system A system and method to eliminate the influence of Dead Time delay in a PWM driven system. The system is implemented using a switching control circuit to operate a pair of upper and lower switching devices in a standard half-bridge arrangement, wherein both a PWM pul... | 01/25/2005 |
| 6843335 | Power conversion apparatus and mobile object incorporating thereof A positive side conductor and a negative side conductor of an input terminal electrically connected to semiconductor elements, are electrically insulated from each other, and are laminated with each other, and the input terminal having such a laminated structure, an... | 01/18/2005 |
| 6845023 | Universal adapter with interchangeable plugs A universal adapter for use with a rechargeable handheld communication device includes a power module. An AC rectifier is operable to convert an AC power signal into a rectified AC power signal. A DC transformer is operable to receive the AC rectified power signal a... | 01/18/2005 |
| 6842354 | Capacitor charge balancing technique for a three-level PWM power converter A power converter includes a DC to AC inverter that is connected to a neutral node formed between first and second capacitors connected across two DC supply lines. The inverter is operated to selectively couple the DC supply lines and the neutral node to an output t... | 01/11/2005 |
| 6842355 | High output power high frequency resonant load inverters A new control strategy for IGBTs when used in high frequency (75 kHz-500 kHz) high power (10 kW-5 MW) inverters with series resonant load, a topology commonly used for induction heating. The strategy changes the IGBT strain elements into a total stress picture that ... | 01/11/2005 |
| 6842352 | Inverter module for train traction systems An inverter module for an electric railcar includes an inverter composed of three 2 in 1 IGBTs, a breaker composed of semiconductor line breaker, and a dry filter capacitor, wherein one inverter corresponds to a single motor. The inverter is a snubberless inverter o... | 01/11/2005 |
| 6838925 | Three level inverter The present invention relates to a high efficiency three-level inverter apparatus containing both bipolar and field effect transistors. An embodiment of a modified control scheme is also presented whereby transistors are modulated differently for each quadrant of ou... | 01/04/2005 |
| 6836416 | Multi-output power conversion circuit In a multi-output power conversion circuit which drives a polyphase AC motor and another device but the polyphase AC motor using a DC power source, a transformer is connected to the neutral point of the polyphase AC motor, an AC voltage at a zero-phase voltage frequ... | 12/28/2004 |
| 6836414 | PWM half-bridge converter with dual-equally adjustable control signal dead-time A method and system of controlling half-bridge DC—DC converters to achieve Zero Voltage Switching (ZVS) for at least one of the switches. The soft-switching half-bridge DC—DC converter system includes soft-switching for all switches by adding an additional branc... | 12/28/2004 |
| 6829152 | Load drive circuit using flywheel diode A load drive circuit, disposed to drive an inductive load, includes a reflux closed circuit connected to the load. A flywheel diode is placed in the reflux closed circuit. A MOS transistor, disposed to turn on/off current to drive the load, is connected in parallel ... | 12/07/2004 |
| 6822866 | Microdrive An AC drive which can be applied to any power using device and in particular is a medium voltage AC drive. In a preferred embodiment, a multilevel AC drive topology is implemented, with the drive including a plurality of inverters and converter electrically coupled ... | 11/23/2004 |
