1
Lewis Illingworth: Ballasts for operating light emitting diodes in AC circuits. Avionic Instruments, Ward & Olivo, May 14, 2002: US06388393 (124 worldwide citation)

Several types of ballast circuits for operating one or many LEDs in AC circuits finding particular use in aircraft lighting panels are disclosed. The first type is a linear transfer function ballast using inductors to limit diode current, and capacitors to ensure unity input power factors. The secon ...


2
Lewis Illingworth: Resonant forward converter circuit with control circuit for controlling switching transistor on and off times. Avionic Instruments, Herbert M Shapiro, June 13, 1995: US05424933 (36 worldwide citation)

An improved resonant forward dc-to-dc converter circuit includes control circuitry for achieving an optimal power cycle in which the transistor is either supplying current to the load or recovering in a sinusoidal manner, for limiting power loss by controlling the switch turn on time to the time whe ...


3
Lewis Illingworth: Means for transformer rectifier unit regulation. Avionic Instruments, Ward & OLivo, July 3, 2001: US06256213 (33 worldwide citation)

Transformer rectifier units (TRU) for the conversion of AC to regulated DC are disclosed. One aspect of a TRU according to the invention is output boost regulation by monitoring the output from a conventional TRU, and when the output drops below 28 volts DC an additional electronic switching convert ...


4
Lewis Illingworth: Lifting platform with energy recovery. Avionic Instruments, Ward & Olivo, October 15, 2002: US06464459 (27 worldwide citation)

A lifting platform is disclosed that utilizes means for energy recovery in order to maximize efficiency. Prior lifting platforms described by the inventor have utilized partial toroidal vortices in order to create a high pressure region below the platform. The present invention, however, improves on ...


5
Lewis Illingworth: Inverter control using current mode slope modulation. Avionic Instruments, Ward & Olivo, August 28, 2001: US06282111 (18 worldwide citation)

A power inverter capable of both DC-AC and DC-DC conversion is disclosed. Said inverter features a novel current mode slope modulation scheme to regulate output while eliminating stability problems commonly held by current mode systems. Furthermore, an embodiment is disclosed utilizing three state m ...


6
Lewis Illingworth: Elastic motor with constant torque output. Avionic Instruments, Ward & Olive, September 2, 2003: US06612402 (10 worldwide citation)

An improved elastic motor is disclosed having a constant torque characteristic. In contrast to earlier motors which use springs wound on spools, the present invention utilizes a reel with elastic stretched to its maximum tension. Each unit length of the elastic is allowed to relax back to its normal ...


7
Lewis Illingworth: Isolated transformer coupled gate drive for signals having variable duty cycle. Avionic Instruments, Ward & Olivo, November 7, 2000: US06144193 (9 worldwide citation)

An improved coupling circuit for use in switched power supplies and other applications utilizes a DC restoration circuit following the secondary stage of a coupling transformer to maintain a relatively constant DC component in the coupled waveform, regardless of its duty cycle. Advantages of the inv ...


8
Compoly Albert William: Parallel phase lock circuitry for inverters and the like. Avionic Instruments, Ostrolenk Faber Gerb & Soffen, August 27, 1974: US3832622 (8 worldwide citation)

Phase lock circuitry for operating a plurality of static inverters in synchronism. The phase lock circuitry includes means for detecting operation of the phase lock circuitry master oscillator, causing the local oscillators of the static inverters to be disabled. The output of the master oscillator ...


9
Compoly Albert William, Temple Alfred Charles: Selectively switched, malfunction-responsive three phase and parallel logic box for plural static inverters. Avionic Instruments, Ostrolenk Faber Gerb & Soffen, November 5, 1974: US3846693 (7 worldwide citation)

Circuitry for operating static inverters which individually are capable of developing a regulated a.c. output at a controlled frequency rate from a d.c. input. The circuitry derives its d.c. input from one or more of the static inverters for developing synchronizing signals to operate the static inv ...


10
Compoly Albert William, Temple Alfred Charles: Short circuit monitor for static inverters and the like. Avionic Instruments, Ostrolenk Faber Gerb & Soffen, November 26, 1974: US3851322 (5 worldwide citation)

In static inverters having means for monitoring the output voltage and output current, a short circuit line monitor is connected thereto and continuously monitors line voltage and line current to generate a trigger warning signal under short circuit conditions such that a current sense signal greate ...