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| Number | Title | Issue Date |
| 7813153 | Inverter An inverter (1) for feeding electric power into a utility grid (7) or into a load is described. The inverter (1) contains direct voltage inputs (2, 3), one first intermediate circuit (8) connected thereto and comprising two series ... | 10/12/2010 |
| 7808803 | Inverter circuit with transformer having balanceable input currents An exemplary inverter circuit (200) includes a direct current (DC) input terminal (210); a transformer (230) including a first primary winding (231) and a second primary winding (232); a first switch transistor (240); a seco... | 10/05/2010 |
| 7480162 | High efficiency two stage inverter In a two stage inverter providing power to a load, a first stage component is operable to receive a first voltage input and a first control input to generate a first voltage output, which is higher than the first voltage input. The first control input is indicative ... | 01/20/2009 |
| 7423891 | Inverter device utilizing three switches controlled in a concurrent manner in a resonant transformer Described is an inverter device suitable for driving a cold cathode fluorescent lamp (CCFL), comprising a transformer having a primary winding and a secondary winding. The primary winding has two terminals connected to a return-path terminal of a direct current (DC)... | 09/09/2008 |
| 7414868 | Switched current power converter with partial converter decoupling for low load conditions A switched current power converter including an input power source, an output terminal, and a plurality of current stages. Each current stage includes a converter coupled to the input power source for providing a current, and a switch circuit for selectively couplin... | 08/19/2008 |
| 7397653 | Inverter design An inverter component layout and mounting bracket are disclosed which allow for electrical components, or the inverter as a whole to be replaced easily in the field. The disclosed mounting bracket and component layout also improve the heat rejection properties of th... | 07/08/2008 |
| 7394671 | Controller IC, DC-AC conversion apparatus, and parallel running system of DC-AC conversion apparatuses A DC power source voltage is supplied to a center tap of a primary winding, and first and second semiconductor switches alternately turned on are disposed between each of both ends of the primary winding and a common potential point, and a current flowing through a ... | 07/01/2008 |
| 7368880 | Phase shift modulation-based control of amplitude of AC voltage output produced by double-ended DC-AC converter circuitry for powering high voltage load such as cold cathode fluorescent lamp A double-ended, DC-AC converter supplies AC power to a load, such as a cold cathode fluorescent lamp used to back-light a liquid crystal display. First and second converter stages generate respective first and second sinusoidal voltages having the same frequency and... | 05/06/2008 |
| 7352134 | Lamp containing fixed reverse phase switching power supply with time-based phase pulse triggering control A lamp contains a lamp voltage conversion circuit within the lamp and connected to a lamp terminal. The voltage conversion circuit includes a phase-control clipping circuit that clips a load voltage and provides an RMS load voltage to the lamp. The phase-control cli... | 04/01/2008 |
| 7298634 | Switching power supply circuit A switching power supply circuit includes a plurality of switching converters, each including a partial resonance voltage circuit combined with a current resonance type switching converter using a half-bridge connection system. For changeover control, a rectificatio... | 11/20/2007 |
| 7276818 | Energy-saving drive apparatus for DC loads Energy-saving drive apparatus for DC loads including a blocking oscillator, an amplifier, an AC-DC-converter, a voltage comparator, a current comparator, and a signal feedback circuit. The DC power produced by all kinds of batteries pass through the blocking oscilla... | 10/02/2007 |
| 7253565 | Apparatus for supplying power, backlight assembly and liquid crystal display apparatus having the same Disclosed are a power supplying apparatus, a backlight assembly and an LCD apparatus having the same. A control section outputs a switching signal so as to control an output of a constant current supplied to a lamp unit in response to on and/or off signals and a dim... | 08/07/2007 |
| 7254048 | Power supply capable of AC and DC input utilizing winding of transformer as boost inductor A programmable AC/DC power converter receives a plurality of input voltages and outputs a single voltage from an input voltage system. A transformer receives the single voltage. One of the plurality of input voltages is provided at a center tap of a secondary windin... | 08/07/2007 |
| 7230387 | Electroluminescent device including a programmable pattern generator An electroluminescent (EL) device achieves a significant increase in the lifetime of EL light sources by using a driver with a controlled duration of intervals between rectangular pulses and between packets is variable, causing changes in the duty cycle, and is dete... | 06/12/2007 |
| 7221100 | Gas discharge lamp power supply An apparatus for providing power to a gas discharge lamp comprises a storage capacitor and an ignition switch coupled through a primarily parasitic first inductor to a parallel combination of a diode assembly and a second inductor in series with a gas discharge lamp... | 05/22/2007 |
| 7218541 | High efficiency two stage inverter In a two stage inverter providing power to a load, a first stage component is operable to receive a first voltage input and a first control input to generate a first voltage output, which is higher than the first voltage input. The first control input is indicative ... | 05/15/2007 |
| 7200017 | Controller and driving method for supplying energy to display device circuitry A controller for controlling at least two power circuits comprises a phase-shift selector for generating a reference signal according to variable input signals, the reference signal is programmed to indicate an amount of phase-delay according to a number of CCFL pow... | 04/03/2007 |
| 7196482 | PWM controller with automatic low battery power reduction circuit and lighting device incorporating the controller A controller for controlling a voltage applied to a load from a power source includes a square wave producing circuit for connection in the circuit with the battery and the lamp. The square wave producing circuit produces a variable duty cycle square wave for contro... | 03/27/2007 |
| 7193868 | Switching power supply circuit A wide-range compatible voltage resonant converter provides high efficiency and allows use of low-breakdown-voltage products for a circuit. The voltage resonant converter is provided with a secondary-side parallel resonant circuit and a secondary-side series resonan... | 03/20/2007 |
| 7193867 | DC converter A DC converter alternately turns on and off a main switch Q1 connected in series with a primary winding P1 of a transformer T and a sub-switch Q2 contained in a series circuit connected to each end of the primary winding P1 of the transfo... | 03/20/2007 |
| 7180759 | Push-pull inverter with snubber energy recovery A power inverter comprises a push-pull inverter circuit that includes a transformer having a primary winding coupled to a DC bus and a secondary winding coupled to an AC bus, main power switches coupling each end of the primary winding to a DC return, and one or mor... | 02/20/2007 |
| 7173380 | Push-pull driver with null-short feature A push-pull driver for powering fluorescent lamps in a backlight system includes a transformer with three primary windings to realize the advantages of both a push-pull switching topology and a full-bridge switching topology. The first and the second primary winding... | 02/06/2007 |
| 7167381 | Digital state controller for a high-voltage generator using the mixed-mode modulation method A description is given of a power supply unit, an X-ray device having a power supply unit, and a method of controlling a power supply unit. In order also to control non-linear control paths, such as of a power supply unit operated with mixed-mode modulation, it is p... | 01/23/2007 |
| 7161309 | Protecting a cold cathode fluorescent lamp from a large transient current when voltage supply transitions from a low to a high voltage A compensation circuit for protecting a lamp from a large transient current. The compensation circuit may include a saw tooth generator configured to generate a saw tooth signal with an amplitude corresponding to a supply voltage of the lamp. A pulse width modulated... | 01/09/2007 |
| 7157861 | Push-pull inverter circuit The present invention discloses a push-pull inverter circuit comprising a transformer with a power output end coupled to a load and two power input ends, and a power driver unit is connected between the two power output ends and a power supply unit, and the power dr... | 01/02/2007 |
| 7151346 | Method and apparatus for optimizing power efficiency in light emitting device arrays The disclosed embodiments provide a method and apparatus for optimizing power efficiency in liquid crystal displays. A microprocessor or embedded microcontroller associated with circuit control modules eliminates redundancy by allowing a single inverter to equalize ... | 12/19/2006 |
| 7151345 | Method and apparatus for controlling visual enhancement of luminent devices The disclosed embodiments provide a method and apparatus for visual enhancement of liquid crystal displays. A microprocessor or embedded microcontroller associated with visual enhancement circuit modules allows a single inverter to control the intensity of illuminat... | 12/19/2006 |
| 7148659 | Programmable AC/DC power supply A programmable AC/DC power converter receives a plurality of input voltages and outputs a single voltage from an input voltage system. A transformer receives the single voltage. One of the plurality of input voltages is provided at a center tap of a secondary windin... | 12/12/2006 |
| 7145546 | Apparatus of driving light source for display device An apparatus of driving a light source for a display device includes a switching unit for selectively transmitting a DC input voltage, an oscillator for converting the DC input voltage into an AC voltage, and a transformer including a primary coil and a secondary co... | 12/05/2006 |
| 7145786 | Point of load sine amplitude converters and methods In a preferred embodiment, a Sine Amplitude Converter (“SAC”) method and apparatus for VTMs converts a DC input voltage to a DC output voltage using a fixed transformation ratio at a frequency locked to a resonance. The SAC uses a resonant circuit including a tr... | 12/05/2006 |
| 7141933 | Systems and methods for a transformer configuration for driving multiple gas discharge tubes in parallel An apparatus and methods for balancing current in multiple negative impedance gas discharge lamp loads. Embodiments advantageously include balancing transformer configurations that are relatively cost-effective, reliable, efficient, and good performing. Embodiments ... | 11/28/2006 |
| 7133299 | Zero voltage switching power conversion circuit A switching power conversion circuit comprises a saturable load assembly, a first switching inductance coil assembly and a second switching inductance coil assembly. The saturable load assembly is composed of a load and a saturable reactor. The first switching induc... | 11/07/2006 |
| 7129647 | Electronic ballast with programmable processor An electronic ballast circuit includes a programmable processor. The processor is programmed to vary operating parameters of the ballast circuit to accommodate operation of different types and/or sizes of lamps. Ballast circuit operating parameters that can be varie... | 10/31/2006 |
| 7126288 | Digital electronic ballast control apparatus and method A ballast control may include a digitally controlled oscillator to provide a precise and consistent oscillation frequency for switching a half-bridge circuit in the electronic ballast. The ballast control may include a digital memory device for storing ballast contr... | 10/24/2006 |
| 7116565 | Over-power protection apparatus for self-excited power converter An over-power protection apparatus for self-excited power converter comprises a soft-start unit, an adjusting unit and a timing unit. A PWM unit of the self-excited power converter generates a switching signal in response to a compensating signal of the soft-start u... | 10/03/2006 |
| 7112943 | Enabling circuit for avoiding negative voltage transients An enabling circuit for enabling a DC—DC converter having a capacitor coupled to an output terminal of the DC—DC converter to be controlled by a control signal. The enabling circuit may include a comparison circuit configured to compare a feedback signal represe... | 09/26/2006 |
| 7075245 | Driving circuit for multiple cold cathode fluorescent lamps backlight applications The present invention provides a driving circuit for driving a light source. The driving circuit includes a serial-arranged transformers system having multiple primary windings and secondary windings; a first switch conducting current though a first path and a secon... | 07/11/2006 |
| 7075329 | Signal isolators using micro-transformers A logic signal isolator comprising a transformer having a primary winding and a secondary winding; a transmitter circuit which drives said primary winding in response to a received logic signal, such that in response to a first type of edge in the logic signal, a si... | 07/11/2006 |
| 7061183 | Zigzag topology for balancing current among paralleled gas discharge lamps An apparatus and methods for balancing current in multiple negative impedance gas discharge lamp loads. Embodiments advantageously include balancing transformer configurations that are relatively cost-effective, reliable, and efficient. Embodiments include configura... | 06/13/2006 |
| 7061777 | Input stage circuit of three-level DC/DC converter An input stage circuit of a three-level DC/DC converter is provided. The input stage circuit uses metal-oxide-semiconductor field effect transistors (MOSFETs) to discharge a flying capacitor to maintain the voltage across the flying capacitor at a half of the input ... | 06/13/2006 |
