John Cardwell Clegg
Engineers in Provo, UT

4039913, Aug 2, 1977

Feb 26, 1976

5/661541

John Cardwell Clegg - Provo UT

Battelle Development Corporation - Columbus OH

H02P 516

318345C

A motor speed control system which comprises: (a) a power modulator circuit having gating means adapted to control the power supplied to the motor; (b) means adapted to provide a voltage which is directly proportional to the instantaneous motor terminal current; (c) means adapted to provide a sensing current which is directly proportional to the voltage across means (b), and thus to the instantaneous motor terminal current; (d) means adapted to provide a sensing current which is directly proportional to the instantaneous motor terminal voltage; (e) summing means adapted to algebraically sum the instantaneous values of the two sensing currents; (f) integrator means adapted to average the sum of instantaneous values provided by means (e); and, (g) feedback means adapted to generate a signal for operating the gating means, said signal having a phase determined by the output of the integrator means, whereby the output of the integrator means controls the phase of the gating means and thereby controls the power supplied to the motor.

4508996, Apr 2, 1985

May 3, 1982

6/373994

John C. Clegg - Provo UT
Ariel R. Davis - Provo UT

Brigham Young University - Provo UT

H05B 3702

315224

The invention is both 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 frequency AC and also provide the ballast needed for operation of the gas discharge lamps. This unit contains a symmetrical, class B, push-pull current-limited, tuned-collector, sinusoidal oscillator which is self starting, highly efficient and stable over a wide range of input voltage, with or without load. The number of parts is a minimum and the parts are relatively low cost, the power losses are very low and the system operates at high power factor with low acoustic and radio noise and low flicker. The system may derive the current from a commercially available source at any voltage and phase but preferably three phase 60 Hz current is used because the three phase primary of a building transformer can convert this into six phase at the output terminals which can be converted to DC of low ripple even without filtering. From the central building supply, it is possible to send AC at suitable voltage to subcenters in the building for rectification, inversion and use in lighting fixtures but preferably there is a single rectifier adjacent to the main transformer and the DC at proper voltage is distrubuted to the fixtures where the ballast unit is installed in a fixture to supply the lamps in it with the high frequency AC.

4630005, Dec 16, 1986

Oct 1, 1984

6/656358

John C. Clegg - Provo UT
Ariel R. Davis - Provo UT

Brigham Young University - Provo UT

H05B 4129

331113A

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 frequency AC and also to provide the ballast needed for operation of the gas discharge lamps. A preferred inverter network includes a symmetrical, class B, push-pull current-limited, tuned-collector, sinusoidal oscillator which is self starting, highly efficient and stable over a wide range of input voltage, with or without load. Circuits are disclosed for dimming the lights, for supplying heating current to lamp filaments at high voltage at the start and much reduced voltage after the arc has been struck in the lamps served by the ballast unit, and this reduction in filament current takes place automatically without switches, resistors or other expensive and energy consuming means.

5030892, Jul 9, 1991

May 3, 1989

7/347177

John C. Clegg - Provo UT

Brigham Young University - Provo UT

H05B 3700

315227R

The present invention discloses a means and method for preventing damage to electronic ballasts for high frequency lamps. In normal use lamps assume rectifying characteristics and generate direct current which interferes with the proper functioning of the system. In one aspect of the invention, a capacitor is used to prevent damage caused by this direct current. In another aspect of the invention, the capacitor also reduces the operating voltage of the lamps while preventing damage caused by the direct current. Another aspect of the invention gives added control of the filament voltage before and after the ignition of the lamps. In a further aspect of the invention, a capacitor is connected in series with the primary of the filament transformer to prevent damage caused by a short circuited secondary.

RE33057, Sep 12, 1989

Apr 2, 1987

7/034436

John C. Clegg - Provo UT
Ariel R. Davis - Provo UT

Brigham Young University - Provo UT

H05B 3702

315224

The invention is both a system for supplying high frequency alternating current to gas discharge lamps, such as fluuorescent 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 frequency AC and also provide the ballast needed for operation of the gas discharge lamps. This unit contains a symmetrical, class B, push-pull current-limited, tuned-collector, sinusoidal oscillator which is self starting, highly efficient and stable over a wide range of input voltage, with or without load. The number of parts is a minimum and the parts are relatively low cost, the power losses are very low and the system operates at high power factor with low acoustic and radio noise and low flicker. The system may derive the current from a commercially available source at any voltage and phase but preferably three phase primary of a building transformer can convert this into six phase at the output terminals which can be converted to DC of low ripple even without filtering. From the central building supply, it is possible to send AC at suitable voltage to subcenters in the building for rectification, inversion and use in lighting fixtures but preferably there is a single rectifier adjacent to the main transformer and the DC at proper voltage is distributed to the fixtures where the ballast unit is installed in a fixture to supply the lamps in it with the high frequency AC.

2004015, Aug 12, 2004

Oct 23, 2003

10/692229

John Clegg - Provo UT, US

H05B039/00

315/291000, 315/307000, 315/308000, 315/312000

Disclosed herein are gas-discharge lighting systems for supplying alternating current to gas discharge lamps such as fluorescent lamps, those systems utilizing a direct current distribution system. Also disclosed herein are such systems that include switches configured for interrupting the direct current, some of those including switch arc suppression. Detailed information on various example embodiments of the inventions are provided in the Detailed Description below, and the inventions are defined by the appended claims.