| Patent Number |
Title Of Patent |
Date Issued |
| 6256209 |
AC to DC conversion arrangement |
July 3, 2001 |
| An arrangement for converting an AC supply to a DC supply comprising an inverter circuit and a boost power factor correction stage. The inverter circuit comprises switchable components and utilizes a pulsed waveform indicative of power factor correction for causing some at least of the |
| 5434880 |
Laser system |
July 18, 1995 |
| A laser system comprises an optical head, a power supply and a computer for controlling the power supply. The optical head comprises a pair of mirrors and four pumping sections. Each pumping section comprises a pair of gas discharge lamps pumping an Nd:YAG laser element. The power supply |
| 5371668 |
Resonant inverter |
December 6, 1994 |
| A resonant inverter has transistor switches (20, 30) arranged to conduct current from a d.c. source (10) alternately in one direction and the other through an inductor (40) and capacitor (42). The transistor switches (20, 30) are turned on alternately by signals from secondary windings ( |
| 5043680 |
Resonant converter oscillator usable for powering a magnetron |
August 27, 1991 |
| 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 (T.sub.1, T.sub.2) which are connected to positive and negative powe |
| 4978829 |
Electric discharge machining power supply circuit |
December 18, 1990 |
| The power supply circuit has an inductor connected to a DC source through a regulating circuit arranged to maintain a constant current in the inductor. A MOSFET is connected to the inductor and to the spark gap so that when the MOSFET is conducting, current is diverted from the inductor |
| 4333134 |
Converters |
June 1, 1982 |
| A high frequency converter of push-pull form comprises a center tapped D.C. input supply 16, 17, 18, two solid state switching devices (20, 21) connected in series across the D.C. input terminals, a load circuit including a supersonic frequency transformer 30 and an output rectifier |
| 4281279 |
Chopper-controlled alternator for battery charging |
July 28, 1981 |
| An alternator for an internal combustion engine driven vehicle comprises a permanent magnet rotor mounted in operation for rotation with the engine crankshaft, a wound stator within which the rotor extends, rectifying means connected to the output of the stator, and a pulse controlled DC |
| 4227243 |
Converters |
October 7, 1980 |
| A converter includes a resonant oscillatory tank circuit comprising a capacitor and an inductor, at least one switching circuit including a solid state switching device in parallel with a diode connected to apply a predetermined potential difference from a DV supply to the inductor, and |
| 4196469 |
DC-AC Converter including synchronized switching |
April 1, 1980 |
| A converter includes a resonant oscillatory tank circuit comprising a capacitor and an inductor, at least one switching circuit including a solid state switching device in series with a diode connected to apply a predetermined potential difference from a DV supply to the inductor, and |
| 4195254 |
Control circuit for a D.C. motor |
March 25, 1980 |
| A control circuit is provided for a d.c. motor for sensing the temperature of the field winding and automatically reducing the temperature of the field winding when the temperature exceeds a preselected value. |
| 4110668 |
Thyristor pulse controller for plural loads |
August 29, 1978 |
| A pulse controller for controlling the current supply to a plurality of d.c. loads through a respective main thyristor for each load is provided with digital circuitry operable to maintain the mark-space ratios of voltage applied to the loads in a relationship to one another which is set |
| 4104571 |
Pulse controllers |
August 1, 1978 |
| A pulse controller for a reversible d.c. series motor is provided, in place of the conventional freewheel diode across the armature and field and plugging diode across the armature, with a unidirectional current path connected across the armature and field and containing sufficient i |
| 4093980 |
D.C. Electrical circuit means |
June 6, 1978 |
| In electrical circuit means having a load, an SCR pulse controller in series with the load and including a commutation capacitor, a transmission line connected to the load and pulse controller to supply the load from a D.C. source, and, a reservoir capacitor shunting the transmission lin |
| 4054817 |
Pulse controllers |
October 18, 1977 |
| A thyristor pulse controller in which current supply to each of a plurality of d.c. loads is controlled by respective main thyristors and a single commutating capacitor common to all the main thyristors is provided, the capacitor being connected across the main thyristors to commutate th |
| 4042865 |
Separately excited D.C. motors |
August 16, 1977 |
| A separately excited speed-controlled D.C. motor which has constant armature current and pulse-controlled field current has its armature connected by way of a bridge rectifier and an inductor to an A.C. source of substantially greater r.m.s. voltage than the rated supply voltage of t |
| 3963967 |
Contactor interlock circuits |
June 15, 1976 |
| A thyristor pulse controller having an electromagnetically actuated shorting contactor comprising an actuating coil and an armature which moves on energization of the actuating coil to close the contactor tips and which moves on de-energization of the coil to open the contactor tips |
