Lutron Technology Company LLC

Lutron Electronics Company, Inc.

Robert William Lenig

Russell Lawrence MacAdam

Michael Sizemore

Joshua W Thaler

Walter Steven Zaharchuk

Stuart William Dejonge

Donald F Hausman

A load control device may control power delivered to an electrical load from an AC power source. The load control device may include a controllably conductive device adapted to be coupled in series electrical connection between the AC power source and the electrical load, a zero-cross detect circuit configured to generate a zero-cross signal representative of the zero-crossings of an AC voltage. The zero-cross signal may be characterized by pulses occurring in time with the zero-crossings of the AC voltage. The load control device may include a control circuit operatively coupled to the controllably conductive device and the zero cross detect circuit. The control circuit may be configured to identify a rising-edge time and a falling-edge time of one of the pulses of the zero-cross signal, and may control a conductive state of the controllably conductive device based on the rising-edge time and the falling-edge time of the pulse.

Controlling a controllably conductive device based on zero-crossing detection

A three-way load control device may be coupled to a circuit including an AC power source, an electrical load, and an external single-pole double-throw (SPDT) three-way switch. The load control device may include a three-way switching circuit comprising an internal SPDT switch, a relay coupled to the internal SPDT switch, a turn-on delay circuit responsive to a voltage at a movable contact of the internal SPDT switch, and a turn-off delay circuit responsive to voltages at fixed contacts of the internal SPDT switch. The turn-on delay circuit renders the relay conductive after a turn-on delay from when either the internal SPDT switch or the external three-way switch is actuated to turn the electrical load on. The turn-off delay circuit renders the relay non-conductive after a turn-off delay from when either the internal SPDT switch or the external three-way switch is actuated to turn off the electrical load.

Three-way switching circuit having delay for inrush current protection

A load control circuit having an overload circuit capable of protecting a switching element from overload conditions over a wide range of operating conditions. The overload circuit limits the maximum average power dissipation of the switching element in accordance with a comparison of an average voltage across the switching element over a half-cycle and a variable threshold. The variable threshold is determined based on an ON-state resistance of the switching element and the environment in which the switching elements are operating. The variable threshold accounts for the squared term (V or I ) in determining power dissipation and allows power to be determined based on average voltage.

Load control system having an overload protection circuit

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Bethlehem, PA, United States of America

Robert William Lenig