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| Number | Title | Issue Date |
| 4719552 | AC-DC converter triggered by variable frequency pulses A circuit arrangement for producing a direct voltage from a sinusoidal input voltage comprising a filter for suppressing interference voltages, a rectifier, a switched mode power supply part and a pulse generator. The pulse generator produces from the rec... | 01/12/1988 |
| 4683529 | Switching power supply with automatic power factor correction An off-line switching power supply is described which controls the switching transistor of a fly-back circuit in such a fashion as to achieve better than 0.99 power factor control. The technique used for power factor control allows the switching power sup... | 07/28/1987 |
| 4680689 | Three-phase ac to dc power converter with power factor correction A system for converting three-phase AC to DC voltage employs three separate converter circuits having their outputs connected in parallel to reduce current harmonics. Each converter circuit includes a full wave rectifier feeding a pulse width current modu... | 07/14/1987 |
| 4622474 | Alternating-current filter circuit arrangement In this three-phase filter circuit system for static converter systems and particularly high-voltage direct-current short ties, at least two high-pass filters are provided which are connected in parallel. Each high-pass filter consists of a choke connecte... | 11/11/1986 |
| 4584636 | AC-to-DC power converter with improved power factor and overvoltage suppression An AC-to-DC power conversion by connecting GTO elements to the positive arms of a three-phase full wave bridge circuit and by repeating the mode of supplying power to a load from an AC power supply by controlling the GTO elements, and the mode of making t... | 04/22/1986 |
| 4567404 | Ballast circuit having electromagnetic interference (EMI) reducing means for an improved lighting unit Various circuit embodiments for reducing the electromagnetic interference (EMI) typically created by a ballast circuit for an improved lighting unit is disclosed. The EMI reducing circuit adapts the operation of the source of the EMI of the ballast circui... | 01/28/1986 |
| 4555751 | Rectified and smoothed DC supplying circuitry A DC power supply circuitry comprises an AC power source transformer with its secondary winding having a center tap; a rectifier circuit; a smoothing circuit; and a bidirectional switching circuit having predetermined threshold values, interposed in betwe... | 11/26/1985 |
| 4517635 | Line-commutated converter circuit This line-commutated converter, in one form, has a pair of D.C. terminals for connection to a D.C. system and a pair of A.C. terminals for connection to an A.C. system. The converter comprises first, second, third, and fourth branches, each comprising the... | 05/14/1985 |
| 4462071 | Supply system An electrical power supply system of the kind in which an input alternating voltage or current is rectified in a rectifier circuit (II) and the output is fed to a load (8) via a smoothing filter (III). The combination of the smoothing filter and load are ... | 07/24/1984 |
| 4460950 | Controlled bridge rectifier A rectifier system in which the harmonic content of the A.C. current is reduced in a particularly efficient manner. Two or more 3-phase thyristor bridges are connected in parallel to the A.C. supply, and to the DC output by way of interphase-transformers.... | 07/17/1984 |
| 4412279 | Switching regulator with transient reduction circuit A switching voltage regulator is provided for coupling a source of AC potential to a DC load. Thyristor full wave rectifier means provide a source of DC potential which is connected to the load through an inductance in series with the load. The input of t... | 10/25/1983 |
| 4408154 | Dual voltage power supply with input filter A dual voltage power supply, for example operable from 120 and 240 volts a-c and having three voltage input terminals, is provided with an input filter having three windings on a core and inductively coupled together, the three windings being connected re... | 10/04/1983 |
| 4394721 | Thyristor power converter with switched impedance An ac to dc power conversion apparatus employing commutated thyristors has a series circuit comprising a capacitor 8 and an impedance element 9 connected at the input side of a thyristor conversion unit 4. The capacitor reduces notch voltages generated du... | 07/19/1983 |
| 4361866 | Power converter apparatus A power converter for power conversion between an a.c. system and a d.c. system includes a full-wave bridge circuit having GTO connected in at least one arm of the full-wave bridge circuit on the positive polarity side. During a conduction-enabled period ... | 11/30/1982 |
| 4340931 | Power supply system A power factor improving system for a power supply system, comprising an AC power supply, a rectifier circuit connected to the AC power supply, a smoothing circuit for smoothing the output current of the rectifier circuit and supplying DC power to the loa... | 07/20/1982 |
| 4317052 | Apparatus for converting an A.C. input signal to a rectified and smoothed D.C. signal Offset voltages of a precision rectifier circuit, buffer amplifiers, and an input comparator of a log converter are compensated for by charging a coupling capacitor to the combined total offset voltage of the apparatus. The charging is effected by causing... | 02/23/1982 |
| 4288729 | Control system for D.C. electric motor A control system for a D.C. electric motor utilizing a Ward-Leonard rotation speed control system in which noise components in the input power to the motor are substantially eliminated. Switching means in the form of gate turning-off thyristors couples a ... | 09/08/1981 |
| 4277728 | Power supply for a high intensity discharge or fluorescent lamp This power supply for a high intensity gas discharge or fluorescent lamp exhibits near unity power factor with no third harmonic distortion, and facilitates highly efficient lamp operation with dimming capability. This is achieved by using an inverter to ... | 07/07/1981 |
| 4258308 | Switching regulator with flyback control offset A switching regulator having a solid state switch which turns on and off as needed to maintain output regulation, a choke which tries to maintain constant current flow, a voltage and current comparator which controls the solid state switch, and a flyback ... | 03/24/1981 |
| 4245293 | Power converter system In a power converter system wherein each thyristor of a three-phase full-wave bridge circuit having thyristors connected in all of bridge arms is fired for its controlling to thereby control the dc output voltage, when the dc output voltage is low, the fi... | 01/13/1981 |
| 4245291 | Electric power converter apparatus for an a.c. electric rolling stock A power converter apparatus for an a.c. electric rolling stock comprising two transformers, each including a primary winding and a plurality of secondary windings generating the same output voltages but having different internal reactances; a pair of phas... | 01/13/1981 |
| 4222096 | D-C Power supply circuit with high power factor A d-c power supply is described which is energized from a relatively low frequency power source and produces a d-c output voltage with low ripple and high power factor. An inductance-capacitance circuit is connected in series with the a-c source and the a... | 09/09/1980 |
| 4195334 | High-voltage DC transmission system and method A high-voltage DC transmission system and method is characterized by a minimum filtering requirement as to ripple as well as to surge and harmonics. Use of a superconducting generator directly coupled to rectifying means eliminates the requirement of a st... | 03/25/1980 |
| 4161772 | Conversion and control of electrical energy by electromagnetic induction An alternating to direct current power converter utilizing dynamically controlled electromagnetic induction. A feedback system controls permeance within a network of magnetic paths by progressive saturation or domain rotation within selected portions of t... | 07/17/1979 |
| 4143414 | Three phase AC to DC voltage converter with power line harmonic current reduction A three phase AC to DC voltage converter includes separate single phase AC to DC converters for each phase of a three phase source with the DC voltage output of the three converters paralleled and controlled to provide necessary regulation. Each of the si... | 03/06/1979 |
| 4142241 | Harmonic insensitive phase sensitive demodulator A harmonic insensitive phase sensitive demodulator which converts complex AC waveforms to a DC voltage proportional to the fundamental component at an arbitrary phase with respect to a reference voltage and eliminates, to any desired degree, the effects o... | 02/27/1979 |
| 4131939 | Constant current power supply A power supply circuit for converting alternating current into d.c. voltage at substantially constant current for loads varying over a wider range of resistance or impedance, allowing the d.c. output voltage to vary in accordance with the load resistance,... | 12/26/1978 |
| 4075685 | Emitter follower voltage controlled power supply An inexpensive DC power supply including a primary DC voltage source generating a voltage with an inherent ripple content that is coupled to energy receiving circuitry by an emitter follower switching circuit under the control of a secondary DC voltage so... | 02/21/1978 |
| 4074344 | High power factor AC to DC converter circuit A high power factor AC to DC converter circuit includes a rectifier circuit coupled to an AC potential source and providing a full-wave rectified pulsating DC potential to a switching regulator circuit with a radio frequency current filter connected in ci... | 02/14/1978 |
| 4053820 | Active filter An active filtration system is described which may be particularly useful for filtering undesired harmonics of the fundamental AC frequency produced by AC to DC or DC to AC conversion. The filtration system of the invention produces currents of a phase, f... | 10/11/1977 |
| 4020411 | Static power converter controlling apparatus for reducing noise generated by phase shift control A static power converter includes a plurality of thyristor bridges. The level of the control voltage is measured and a signal representative of the measured level is generated which causes one thyristor bridge to maintain a substantially zero output D.C. ... | 04/26/1977 |
| 4013955 | Analog signal processor An analog signal processor that is particularly suitable for measuring, igrating and holding a single or a pair of analog signals. The input signal to the analog signal processor may be sinusoidal of relatively low frequency and of low signal strength an... | 03/22/1977 |
| 4002958 | AC output power control system An AC output power control system comprising turn-on means controlling at least three or three groups of switches operationally connected between a power source and a load in predetermined order, means for feeding power including at least an AC component ... | 01/11/1977 |
| 4001671 | Apparatus for providing feedback to eliminate a DC component in the output of a static VAR generator Apparatus provided for utilization with the control circuit of a static VAR generator to determine the presence of a DC component in the output of the VAR generator which component is not desirable because it may effect certain AC power components such as... | 01/04/1977 |
| 3987356 | Controlled capacitive filter for active loads A single phase controlled capacitive filter with a smaller, more efficiently used filter capacitor than conventional capacitive filters is connected between rectifier terminals and supplies voltage to an active load producing dc output voltage. The charge... | 10/19/1976 |
| 3936719 | High voltage generator for a television receiver A high voltage generator comprising a high voltage generating transformer having a primary winding and first and second secondary windings, a first rectifier having one end connected to one end of the first secondary winding, a capacitor connected to the ... | 02/03/1976 |
