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| Number | Title | Issue Date |
| 8102681 | Measurement apparatus, test apparatus, and measurement method Provided is a transformer, comprising a first winding and a second winding that interlink with a main magnetic flux; and a third winding that interlinks with a magnetic flux leakage interlinking with only one of the first winding and the second winding. ... | 01/24/2012 |
| 7423385 | System and method for controlling voltage on discharge capacitors which control light energy from flash lamps A system and method are described for controlling voltage on discharge capacitors which control light energy from flash lamps, wherein the method includes measuring over time an operational behavior of a flash lamp for performing photothermolysis, wherein a discharg... | 09/09/2008 |
| 7408311 | Protection device for electric motor driving devices and corresponding driving device A protection device protects a driving device of an electric motor with at least three phases and at least three windings and the driving device comprises a power stage suitable for driving directly said at least three windings. The driving device is suitable for ac... | 08/05/2008 |
| 7362594 | Adaptive resonant switching power system A resonant switching power system operates with two resonant frequencies. A first frequency depends on the secondary leakage inductance of an output transformer and capacitor. The first frequency varies with changes in the load because load changes alter the leakage... | 04/22/2008 |
| 7352140 | Master-slave control architecture for inverters A master-slave control architecture for inverters includes a master control circuit board which has a master control unit to output a plurality of frequency signals of the same phase and same frequency so that driving units on a plurality of separated slave control ... | 04/01/2008 |
| 7330024 | Power supply device, test apparatus, and power supply voltage stabilizing device A power supply device for supplying source current to an electronic device comprises: a current output unit for outputting output current including at least the source current as a component of the current thereof; a connection resistor which electrically connects t... | 02/12/2008 |
| 7286622 | System and method for performing on-chip synchronization of system signals utilizing off-chip harmonic signal Aspects of the invention provide a method end system for reducing signal distortion within an on-chip transceiver module. In response to receipt of a signal bearing at least one external clock frequency, at least one harmonic signal of the signal bearing the at leas... | 10/23/2007 |
| 7276901 | Method for shunt detection in sensors For monitoring a sensor using differential voltage evaluation for detecting a short circuit to ground and/or to supply voltage UB, a first resistor and a second resistor R1, R2 are assigned to the sensor, a sum voltage is determined ... | 10/02/2007 |
| 7233645 | Systems and methods for controlling an X-ray source A control system for an X-ray source includes a sensor interface for receiving one or more sensor signals representative of operation of the X-ray source; a programmable controller operative in response to the one or more sensor signals and a sequence of control ins... | 06/19/2007 |
| 7196915 | Integrated transformer based step-up converter A step-up converter based on an integrated transformer, comprising a self-resonating oscillator circuit that has inductive elements constituted by primary and secondary windings of at least one first transformer, the self-resonating oscillator circuit being powered ... | 03/27/2007 |
| 7193866 | Half-bridge LLC resonant converter with a synchronous rectification function The invention discloses a half-bridge LLC resonant converter with a synchronous rectification function that includes a first switch; a second switch; a first transformer; a first synchronous rectifier; a second synchronous rectifier; a controller; and a second trans... | 03/20/2007 |
| 7187563 | DC/DC converter with multiple mutually-isolated power sources An electronic circuit includes a first power source, a second power source, a load, and a converter connected to each power source and the load. The converter has (i) a first oscillator circuit connected to the first power source, (ii) a second oscillator circuit co... | 03/06/2007 |
| 7173394 | Apparatus and method for controlling inverter An apparatus and method for controlling an inverter are disclosed to allow an inverter to provide a stable output voltage to a motor regardless of a change in a DC input voltage. A difference value between a reference voltage according to a predetermined rated volta... | 02/06/2007 |
| 7149902 | Apparatus for and method of supplying power with power saving function A power supplying apparatus having a power saving function and a method of supplying power with a power saving function. An auxiliary power generator generates auxiliary power in response to a cutoff signal. A main power generator senses the generation of the auxili... | 12/12/2006 |
| 7138992 | Method of calibrating luminance of display, driving circuit of display employing same method and portable electronic device provided with same driving circuit A method for calibrating luminance of a display is provided which is capable of reducing power consumption in simple and low-cost configurations without putting a load on a CPU adapted to control each component of a portable electronic device. An amount of light cor... | 11/21/2006 |
| 7138614 | Non-contact feeder system A non-contact feeder system to supply an induced current to an electrical load includes at least three feeding cables arranged approximately parallel with one another along a moving direction of the electrical load; a plurality of AC power supplies to supply AC curr... | 11/21/2006 |
| 7102898 | Isolated drive circuitry used in switch-mode power converters A drive transformer and associated circuitry for providing power and appropriate delays to primary switches and synchronous rectifiers in switch-mode power converters. The circuitry takes advantage of the leakage inductances of the drive transformer windings as well... | 09/05/2006 |
| 7081708 | Lighting circuit A lighting circuit for lighting a vehicular lamp including a plurality of light-emitting diodes, includes: a selection unit for selecting the number of light-emitting diodes to be connected in series in the vehicular lamp based on an instruction from the outside; a ... | 07/25/2006 |
| 7050309 | Power converter with output inductance In a power converter, the duty cycle of a primary winding circuit causes near continuous flow of power through the primary and secondary winding circuits during normal operation. By providing no regulation during normal operation, a very efficient circuit is obtaine... | 05/23/2006 |
| 7038975 | Luminous hands and display device including the same, particularly in a timepiece There is provided a type of luminous hand including a part made of moulded transparent material that forms a circular head (28, 35) and a body (28, 34) of a hand. In order to direct a portion of a light beam parallel to the axis (15) of the hand... | 05/02/2006 |
| 7035120 | Driving circuit employing synchronous rectifier circuit An example synchronous rectifier circuit includes a transformer having a primary winding and a secondary winding which are insulated from each other; a main switch provided at a primary side of the circuit, which includes the primary winding; a rectifying FET provid... | 04/25/2006 |
| 7031128 | Power circuit protection apparatus A power circuit protection apparatus halting an operation of a pulse width modulation (PWM) controller when an abnormal state is generated due to an open or short in a secondary side winding of a transformer is provided. The apparatus includes: a transformer; an out... | 04/18/2006 |
| 6961252 | Switching power supply An AC/DC switching power supply that realizes a high power factor and has little voltage stress on a smoothing capacitor is provided. Also a switching power supply that has little voltage stress on a switch and is suitable for reduction in loss and miniaturization i... | 11/01/2005 |
| 6954364 | Backlight inverter for liquid crystal display panel with self-protection function A backlight inverter for an LCD panel which is capable of detecting a fault in a transformer device or an open-lamp condition and performing a control operation to stop its operation upon detecting the fault in the transformer device or the open-lamp condition. The ... | 10/11/2005 |
| 6950317 | High temperature power supply A high-temperature, regulated power supply uses wide band gap transistors to drive a Royer circuit. Pulses output from the Royer circuit are gated through a pulse width modulator to control the duty cycle of wide band gap transistors that drive an output transformer... | 09/27/2005 |
| 6940732 | Synchronous rectifier circuit There is provided a synchronous rectifier circuit that makes it possible to secure sufficient driving voltage for the rectifier switch regardless of the voltage of the secondary winding. In this synchronous rectifier circuit, the primary winding is insulated from th... | 09/06/2005 |
| 6936974 | Half-bridge inverter for asymmetrical loads The invention pertains to a switchmode power inverter, and particularly to a half-bridge inverter for asymmetrical load. More particularly, the invention pertains to high frequency electronic ballast for gas discharge devices, especially for high intensity discharge... | 08/30/2005 |
| 6917136 | Synchronous machine design and manufacturing Synchronous motors according to the invention operate at higher efficiency, with lower cost, reduced mass and reduced cogging. Magnet dimensions are selected that reduce cogging forces to a negligible amount even though there are fewer slots than normal. Optionally,... | 07/12/2005 |
| 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 |
| 6903943 | Switching circuit This switching circuit includes a transformer having primary and secondary windings insulated from each other; a voltage-driven switching element which is connected in series to one of the primary and secondary windings and has a control terminal for controlling a s... | 06/07/2005 |
| 6680854 | Switching power supply A switching power supply includes a transformer having a primary winding connected to a pair of a.c. input terminals via a rectifier circuit, and a secondary winding connected to a pair of d.c. output terminals via a rectifying and smoothing circuit. Conn... | 01/20/2004 |
| 6584000 | Electronic stabilizer An electronic stabilizer includes an output transformer, a variable frequency/power amplifying loop, a low voltage variable frequency rectifying loop, and two elements of high resistance value. The primary side of the output transformer is connected with ... | 06/24/2003 |
| 6472827 | Parallel-resonant inverter-type fluorescent lamp ballast A push-pull inverter is supplied from an inductively current-limited DC voltage source by way of a center-tap on a transformer having significant inductance. This transformer inductance is parallel-coupled with a capacitance means. The inverter is made to... | 10/29/2002 |
| 6369525 | White light-emitting-diode lamp driver based on multiple output converter with output current mode control A white light-emitting-diode array driver circuit with a multiple output flyback (or forward) converter with output current mode control. The circuit comprises a power supply source and a transformer. The transformer has a primary winding coupled to, and ... | 04/09/2002 |
| 6304464 | Flyback as LED driver The invention relates to a circuit arrangement for operating a semiconductor light source, comprising input terminals for connecting a supply voltage, input filter means, a converter provided with a switching element having a control circuit, and provided with... | 10/16/2001 |
| 6275401 | Self-driven synchronous rectification circuit for low output voltage DC-DC converters A synchronous rectification circuit for a DC-DC power converter can operate efficiently with a primary drive voltage that remains at a zero voltage level during a portion of the power conduction cycle. The DC-DC power converter includes a primary side pow... | 08/14/2001 |
| 6108219 | DC power converter circuit A self oscillating power converter uses two MOSFET transistors connected across first and second primary windings. Each MOSFET is controlled using a gate control circuit located in a feedback path. Each gate control circuit is driven by a gate drive windi... | 08/22/2000 |
| 6009001 | Self-oscillation-resonance type power supply circuit A self-oscillation-resonance type power supply circuit having a stabilizer for output voltages or output currents. A transformer and two transistors (a first transistor and a second transistor) are used to form a push-pull type self-oscillation-resonance ... | 12/28/1999 |
| 5898579 | Non-contact power distribution system An inductively coupled power distribution system for moving vehicles, in which resonating primary circuits to distribute power for resonating secondary circuits to collect and use in an optimized manner. In order to have all circuits resonating at substan... | 04/27/1999 |
| 5578908 | Phase control circuit having independent half cycles A phase control circuit according to the present invention is configured for connection between and AC source and an AC load. The AC source supplies an AC drive signal having a plurality of sequential positive and negative half cycles. The phase control c... | 11/26/1996 |
