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| Number | Title | Issue Date |
| 7180206 | System for voltage stabilization of power supply lines The invention relates to a voltage stabilization system for power supply lines, comprising a variable inductance, an autotransformer and a system for controlling the variable inductance to automatically compensating for voltage variations of the power supply lines. ... | 02/20/2007 |
| 7164340 | Transformer for switching power supply A transformer is constituted of an inner core, a plurality of outer cores connected in a ring to the inner core, a primary winding which is fed with a high frequency wave and wound around the inner core, and a secondary winding wound outside the primary winding. The... | 01/16/2007 |
| 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 |
| 7113068 | Winding structure of inductor used in power factor correction circuit A winding structure of an inductor used in a power factor correction circuit is provided. The winding structure includes a ring-shaped core with a gap, a first coil and a second coil wound around the core. The negative end of the first coil and the positive end of t... | 09/26/2006 |
| 7061356 | Controllable transformer A controllable transformer device comprising a body of a magnetic material, a primary winding wound round the body about a first axis, a secondary winding wound round the body about a second axis at right angles to the first axis, and a control winding wound round t... | 06/13/2006 |
| 7026905 | Magnetically controlled inductive device A controllable inductor, comprising first and second coaxial and concentric pipe elements, where said elements are connected to one another at both ends by means of magnetic end couplers, a first winding wound around both said elements, and a second winding wound ar... | 04/11/2006 |
| 6917527 | Switching power supply A low-cost, easily-miniaturized switching power supply restrains voltage stress on first and second main switches. The switching power supply has small loss and low noise, enables setting of duty factors over a broad range, and has reduced thickness. The first main ... | 07/12/2005 |
| 6903914 | DC-DC converter having active transient response compensation circuit employing flyback inductor A DC-DC converter has an output bus coupled to power a load. A voltage transient compensation circuit has a first switch between a voltage input bus and the output bus, and a second switch between the output bus and a flyback transformer coupled to a reference volta... | 06/07/2005 |
| 5982106 | Self-protected series resonant electronic energy converter An energy conversion device has a self-oscillating transistorized L-C series-resonant half-bridge inverter circuit having alternating resonant inductor current and adapted to deliver a high frequency signal to an effective load coupled effectively in para... | 11/09/1999 |
| 5821826 | Oscillator circuit synchronization An apparatus and method for generating signals. According to one embodiment, the apparatus has an oscillator generating a series of signals, an output stage for transforming the series of signals into a second series of signals, and a watchdog for providi... | 10/13/1998 |
| 5477112 | Ballasting network with integral trap Briefly, to reduce switching stresses, employed is a high-frequency AC power source (110) and a current-limiting (ballasting) network (116). The network ( 116 ) includes a high-frequency trap ( 120 ) and an impedance transforming network (122), which is c... | 12/19/1995 |
| 5313143 | Master-slave half-bridge DC-to-AC switchmode power converter The invention pertains to a switchmode DC to AC converter, and particularly to a master-slave half-bridge converter. The slave half-bridge power converter is controlled by a lower power self-oscillating half-bridge master converter. More particularly, the... | 05/17/1994 |
| 5191262 | Extra cost-effective electronic ballast A half-bridge inverter is powered from a constant DC voltage and provides an AC output voltage that is--in contrast with the usual squarewave voltage--describable as being a sinusoidal waveform with the tops clipped off at some fixed magnitude; or, descri... | 03/02/1993 |
| 5162981 | Low voltage D.C. to D.C. converter A circuit for converting on d.c. voltage to another d.c. voltage including a transformer having a center tap and first and second end leads. A d.c. source voltage is connected to the center tap of the transformer. The end leads are connected to ground thr... | 11/10/1992 |
| 5121032 | Power supply for turning on small fluorescent light of liquid crystal display TV A small fluorescent light turning on power supply device for a liquid crystal TV for operating the back light of the liquid crystal display TV. The invention is characterized in that a resonance type turning capacitor CS is connected to the lig... | 06/09/1992 |
| 5097183 | Master-slave half-bridge DC-to-AC switchmode power converter A switchmode DC to AC converter, and particularly a master-slave half-bridge converter. The slave half-bridge power converter is controlled by a lower power self-oscillating half-bridge master converter. More particularly, the invention pertains to a high... | 03/17/1992 |
| 5068571 | Switched bridge circuit A switched bridge circuit has semiconductor bridge elements (T1,T2) which are arranged to provide a commutated output from a d.c. source (+300V). The commutation is effected by a switching signal from a control circuit. The control circuit for switching t... | 11/26/1991 |
| 5049788 | Lighting device of fluorescent lamp A lighting circuit for a fluorescent lamp includes a D.C. power supply which is connected across a pair of series transistors. A transformer has first and second windings connected to the bases of respective transistors and a third winding connected betwe... | 09/17/1991 |
| 5043680 | Resonant converter oscillator usable for powering a magnetron A magnetron is powered via an output transformer TR whose primary winding (a) is connected in series with a resonant converter oscillator circuit comprising an inductor (L) and a capacitor (C3) and switching transistors (T1, T2) whic... | 08/27/1991 |
| 5027038 | DC/AC converter for the supply of a gas and/or vapor discharge lamp A DC/AC converter for supplying two discharge lamps (12, 13). Two input terminals (4, 5) of the converter are interconnected by a series circuit comprising two switching elements (6, 7). A capacitor (8) connects one of the input terminals (4) to a common ... | 06/25/1991 |
| 5008596 | Fluorescent lamp high frequency operating circuit To provide enhanced starting voltages for fluorescent lamps operating, for xample, from 110 V power networks through a rectifier, and in which a high-frequency oscillatory circuit is used which includes a ring core transformer (TR1, TR2, TR3) operated unde... | 04/16/1991 |
| 4862040 | Frequency-modulated inverter-type ballast In an inverter-type fluorescent lamp ballast, the inverter is powered from an ordinary electric utility power line by way of a rectifier means providing to the inverter a DC voltage having magnitude variations of about plus/minus 30% occurring at twice th... | 08/29/1989 |
| 4818953 | Oscillator improvement An improved oscillator circuit for avoiding core saturation without the need for auxiliary magnetic devices employs an emitter resistance for regulating base voltage, and a semiconductor base shunt for initiating transistor cut-off when the base voltage i... | 04/04/1989 |
| 4745537 | Low dissipation power converter A converter of electric power at a first value of voltage and frequency produces a voltage at a second value and at a higher value of frequency by means of an inverter oscillator circuit having two serially connected transistors. An output power transform... | 05/17/1988 |
| 4700147 | Transistor power inverter with synchronizing circuit An oscillator circuit for generating a square wave output for space or terrestrial applications comprising a main oscillator and a saturable transformer forming the feedback loop of the power inverter. According to the invention, a synchronization circuit... | 10/13/1987 |
| 4700112 | Fluorescent lamp lighting circuit A flourescent lamp lighting circuit comprising a rectifying circuit and an oscillatory circuit. The rectifying circuit comprises a rectifier bridge, capacitors and coils to rectify the local alternating power supply to direct power supply and provide rect... | 10/13/1987 |
| 4694224 | Lighting apparatus for an electric discharge lamp A lighting apparatus for an electric discharge lamp includes a lighting ballast capacitor connected in series to an electric dicharge lamp for stabilizing a lighting current to the lamp; a preheating ballast capacitor connected in parallel to the lamp for... | 09/15/1987 |
| 4677345 | Inverter circuits High-efficiency inverter circuits, particularly half-bridge devices, are especially suitable for energizing gas discharge lamps. The inverters preferably employ a series-connected combination of an inductor and a capacitor to be energized upon periodic tr... | 06/30/1987 |
| 4644459 | Electronic inverter having magnitude-controllable output 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... | 02/17/1987 |
| 4642749 | Replica driver transformer for inverter circuit An inverter circuit having an output power transformer if provided with a replica driver transformer which is a miniature "clone" of the power transformer. The replica driver transformer uses the same core material as the power transformer and is designed... | 02/10/1987 |
| 4630005 | Electronic inverter, particularly for use as ballast Disclosed is a system for supplying high frequency alternating current to gas discharge lamps, such as fluorescent lamps, and the like and a unit that can be placed in or adjacent to a lighting fixture to convert a direct current supply into high frequenc... | 12/16/1986 |
| 4617533 | Circuit arrangement for a blocking oscillator switching power unit A blocking oscillator contains a switching transistor which is driven by an integrated circuit. This circuit receives its supply voltage during the blocking phase from a winding at the primary side. A further winding at the primary side supplies the regul... | 10/14/1986 |
| 4613796 | Single transistor oscillator ballast circuit A single power transistor oscillator circuit includes a single transistor oscillator coupled by an inductive means including an inductive coil and transformer to a DC potential development means with a wave-shaping means coupled to a secondary winding of ... | 09/23/1986 |
| 4609981 | Direct current converter for switched mode power supply The converter comprises an output transformer (T1) through which pass trapezoidal current waves. The primary winding (A0) is supplied under the control of two control circuits (P1, P2), each comprising a transistor (Q1, Q2) and a diode (D1, D2) which are ... | 09/02/1986 |
| 4603307 | Inverter using current steering saturable inductors or diodes An inverter (100) receives a DC voltage and generates therefrom a square wave output signal. The inverter includes an output transformer (T3) and a saturable core transformer (T4). The saturable core transformer (T4) provides base current for a first tran... | 07/29/1986 |
| 4590433 | Doubled balanced differential amplifier circuit with low power consumption for FM modulation or demodulation A switching circuit apparatus driven by a relatively low DC power supply voltage, which includes a power supply terminal designed to receive a DC power source voltage, a pair of switching circuits comprising switching transistors (28, 30 and 32, 34) conne... | 05/20/1986 |
| 4562382 | Solid-state inverter including a multiple core transformer A D.C. to A.C. inverter using switching transistors driving a multiple-core transformer which includes a high-permeability saturable core upon which both the primary and secondary windings are wound and one or more lower permeability non-saturating cores ... | 12/31/1985 |
| 4553070 | Electronic ballast for a discharge lamp An electronic ballast for a discharge lamp (8) for restricting and stabilizing the lamps current. The ballast comprises a high frequency oscillator for connection to a D.C. supply which consists of two transistors (1,2) connected in series, with a base dr... | 11/12/1985 |
| 4542450 | Electrical converter including gain enhancing means for low gain transistors An electrical converter for supplying electrical power to a load from a d.c. source and which includes semi-conductor switching means for converting a direct input current to an alternating current and output transformer means fed with the alternating cur... | 09/17/1985 |
