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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7233115 | LED-based lighting network power control methods and apparatus Multiple lighting apparatus coupled together to form a lighting network, in which operating power is efficiently provided throughout the network based on a distributed DC voltage or a distributed AC voltage. Based on various power driver configurations, each lightin... | 06/19/2007 |
| 7187569 | Signal generation apparatus and method for seafloor electromagnetic exploration An apparatus for generating electronic signals for application in subsea electromagnetic exploration. A surface generated high-voltage low-current source signal stabilized at a first frequency is supplied to a deep-tow vehicle (18) via an umbilical cable (... | 03/06/2007 |
| 7173834 | Half-controlled silicon-controlled rectifying system and method thereof A half-controlled silicon control rectifying system and method thereof are provided. In this case, the first detection unit detects the zero cross phase of the triphase AC in input port thereof. The second detection unit detects the voltage of the DC bus. Then the c... | 02/06/2007 |
| 7138770 | LED driving circuit An LED driving circuit that is directly activated by an AC power supply is disclosed. A driving circuit has a first and second pair of opposite branches. The first pair of opposite branches operates in a positive half cycle of the AC power supply and the second pair... | 11/21/2006 |
| 6934169 | Method of controlling half-controlled rectifier, and rectifier structure A method of controlling a half-controlled rectifier, and a rectifier structure, which comprises an n-phased half-controlled converter bridge, a DC intermediate circuit and a capacitor of the DC intermediate circuit. The converter structure further comprises an auxil... | 08/23/2005 |
| 6920577 | Clock selection circuit for selecting between an external clock and a clock generated by comparing a count value with a setting value A setting value is initially stored in a comparison and coincidence register. Thereafter, a value of a count signal is incremented in a base timer while resetting the value of the count signal to zero each time the value of the count signal reaches a prescribed valu... | 07/19/2005 |
| 6577072 | Power supply and LED lamp device An LED lamp device of the invention includes a power supply unit (102, 103) supplied with an alternating-current power supply voltage, and an LED lamp (106) constituted by one or a plurality of serially connected LEDs connected to output terminals of the ... | 06/10/2003 |
| 6532160 | Switching power supply A switching power supply comprises a transformer 3, a switching circuit 1, an output rectifier circuit, an output smoothing circuit, and a snubber circuit. A snubber capacitor 17 has one terminal connected to the one terminal of a snubber diode 19. The ot... | 03/11/2003 |
| 6493245 | Inrush current control for AC to DC converters The present invention provides for an apparatus and corresponding method for controlling inrush current in an AC-DC power converter by controlling the state of a plurality of silicon-controlled rectifiers (SCRs) when AC power is lost. The present inventio... | 12/10/2002 |
| 6301139 | Self-driven synchronous rectifier circuit for non-optimal reset secondary voltage A power converter has a self-driven synchronous rectification circuit that can operate efficiently with a non-optimal reset secondary voltage waveform that remains at a zero voltage level during a portion of the switching cycle. The power converter circui... | 10/09/2001 |
| 6108224 | Phase shift triggering circuit for thyristor and an integrated module of the triggering circuit and the thyristor A phase-shift thyristor trigger circuit, including a synchronous signal sampling circuit, a waveform shaping, integrating and comparator circuit, a high-frequency modulating pulse distributor circuit, a power amplification and high frequency pulse rectifi... | 08/22/2000 |
| 5995395 | Control of a composite bridge at zero voltage The present invention relates to a device for controlling a composite bridge including two anode-gate thyristors, the cathodes of which are connected together to a positive output terminal, the gates of the two thyristors being interconnected. The device ... | 11/30/1999 |
| 5519600 | Three-phase self-balancing power supply In a delta-connected power supply system, phase switching circuits are employed and are activated during the failure of one of N+1 converter units. This activation is employed even though there has been no outage in any one of the input phases. The result... | 05/21/1996 |
| 5483435 | Power generation system having induction generator and controlled bridge rectifier A power generation system is constituted by an induction generator and a converter. An output current waveform of the induction generator is determined by the magnetic flux, speed, winding impedance, DC output voltage, and load of the induction generator.... | 01/09/1996 |
| 5260863 | Control of a discontinuous current by a thyristor rectifier with inductive load For controlling the current in an inductive load, the gate current used to fire thyristors in a rectifier is controlled to reach zero at exactly the same time, within a given half-wave, as the current in the inductive load which receives the voltage from ... | 11/09/1993 |
| 4811189 | AC rectifier circuit with means for limiting the rectified voltage The invention relates to an AC voltage supplied rectifier circuit with a downstream smoothing capacitor. A prior art problem with this type of circuit was that the inductive impedance of the supply voltage caused a practically umdamped oscillation between... | 03/07/1989 |
| 4780802 | Control circuit for removing ripple of direct current supply system for voltage source inverter The present invention relates to a power source apparatus for supplying a stabilized D.C. output to an inverter. In a D.C. power source apparatus for an inverter comprising a forward power conversion circuit receiving commercial A.C. power supply for outp... | 10/25/1988 |
| 4729082 | Control device for power converter The invention relates to the control of a power converter in which the AC side is connected through a reactor to an AC power supply while the DC side is connected to a smoothing capacitor and a load and the power rectification and the power inversion are ... | 03/01/1988 |
| 4725939 | System for supply of direct current to at least two electrical loads with a common polarity, in particular for multiple electric arcs A system for supply of direct current to at least two electrical loads having a common polarity, especially for power supply to an arc furnace with several electrodes or to plasma generators, comprises a set of load-controlled rectifiers (7) arranged in a... | 02/16/1988 |
| 4641234 | A-C or D-C to D-C converter for dual current locomotives with D-C motors The present invention relates to supplying a load either from a direct-current source or from an alternating-current source. The power unit, according to the invention, is characterized in that it consists of a single conversion unit (CV) having unidirect... | 02/03/1987 |
| 4636932 | dv/dt Protection circuit device for an AC-DC converter apparatus A dv/dt protection circuit device for an AC-DC converter apparatus including control board switching arrangement having a current cut-off function which conducts an interrupts current from a power source to a load and refluxes the load current while the c... | 01/13/1987 |
| 4618921 | Power supply system and a starting method thereof A power supply system for supplying a load current to a load including a serially connected circuit of a controlled rectifier, a switch and a capacitor. A diode is connected in parallel with the capacitor or with a serially connected circuit of the switch... | 10/21/1986 |
| 4589051 | Second breakdown protection circuit for X-ray generator inverter In an X-ray generator operating with a pulse-width-modulated transistor inverter, circuitry is provided to sense the collector-emitter voltage of each of the transistors and to responsively turn off the transistor when that voltage level reaches a predete... | 05/13/1986 |
| 4468724 | Method and apparatus for controlling load current A load DC motor is supplied with a DC current through a converter principally consisting of thyristors controlled by an ON-state control signal. The load current is detected both as to the mean value and the variation in time thereof. The mean value of th... | 08/28/1984 |
| 4467408 | Means for controlling a forced commutated ac-to-dc electric rectifying circuit to avoid commutation failure A phase-controlled ac-to-dc rectifying circuit includes a pair of alternately conducting main controllable electric valves and cyclically operative forced commutation means for turning off the main valves. The forced commutation means comprises a pair of ... | 08/21/1984 |
| 4450516 | Device for controlling the regulating facilities in an electric high-power AC-DC converter The invention relates to a device particularly adapted for use with the power supply of a computer for controlling the regulating facilities in an electric high-power AC-DC converter of the power supply. This control device (D) comprises a regulation (CC) cont... | 05/22/1984 |
| 4450385 | Inductive ballasting of direct current gas discharges A ballast circuit for direct current gaseous electrical discharge devices includes a rectifying bridge, and an inductive ballast for storing excess energy. The rectifying bridge uses a pair of thyristors which must be gated on for the bridge to supply rec... | 05/22/1984 |
| 4376968 | Protection system for immunizing an inverter system against A-C line voltage disturbances When a-c power line voltage is rectified by a phase-controlled SCR rectifier bridge to develop an adjustable d-c bus voltage which is then converted by an inverter back to a-c for driving a load, such as a motor, line voltage disturbances, resulting from ... | 03/15/1983 |
| 4315305 | Controlled D-C power supply By controlling the phase angle at which conduction occurs in the SCR's in an SCR rectifier bridge, a d-c voltage of adjustable magnitude may be produced from a-c line voltage applied to the bridge. The specific angle at which the SCR's are fired into cond... | 02/09/1982 |
| 4233558 | Regulated dual DC power supply A dual section power supply, one section for supplying high voltage dc po and the other section for supplying low voltage dc power, are each connected to a common ac source. The high voltage section employs a phase-controlled rectifier, the control circu... | 11/11/1980 |
| 4204148 | Regulation circuit A regulation circuit for providing timing gate signals to the dc power section of a power supply, the regulation circuit utilizing phase angle conduction of a programmable unijunction transistor. The conduction angle is determined by the occurrence of the... | 05/20/1980 |
| 4164016 | Current sensing system A circuit for sensing the current applied to a load in power supplies, inverters, and other power conversion equipment and similar systems wherein the voltage between the center tap of the transformer secondary winding and the junction of two resistors co... | 08/07/1979 |
| 4161022 | Controllable rectifier circuit for a power supply A controllable rectifier circuit which may be used in a power supply selectively produces a half-wave or a full-wave rectified signal. The rectifier circuit includes a pair of input terminals for receiving an AC signal and a bridge rectifier coupled to th... | 07/10/1979 |
| 4144559 | Power converter control system A power converter control system for use with a power converter of the type which comprises a plurality of cascade-connected converter units of which at least one converter unit is subjected to continuous control of its conduction phase angle and the rema... | 03/13/1979 |
| 4122514 | Direct current power supply A direct current voltage power supply in which spaced pulses of current are made to flow through the primary winding of a power transformer. The anode-cathode path of an SCR device is connected from a point on a secondary winding to an output capacitor. A... | 10/24/1978 |
| 4118769 | Full wave demand controlled preregulating supply A circuit comprising first and second rectifiers for supplying rectified current or voltage to a storage capacitor located at the output of the circuit. The circuit includes a control circuit operatively coupled between the output and the silicon controll... | 10/03/1978 |
| 4090234 | Input tap changer A noise free circuit for a transformer secondary having SCR taps which are rendered selectively conducting thereby varying the effective turns ratio of the transformer and providing an instantaneous input tap changer responsive to wide variation in input ... | 05/16/1978 |
| 4074345 | Electronic power supply An electronic power supply utilizes a full wave bridge rectifier circuit whose alternating current voltage source is derived from a multi-primary and multi-secondary winding transformer whose windings are selectively disposed in series or parallel circuit... | 02/14/1978 |
