Innovative Controls Inc.

Other

Graphic Arts Manufacturing Company

Donald S Kuhnel

Sidney A Ottenstein

Gerald W Dunegan

Ray A Flannery

Exterior luminaire

A swimming pool alarm system is provided for actuating an alarm in response to the movement of a person in a swimming pool. The system includes a transmitter mounted below the surface of a swimming pool to continuously transmit ultrasonic sound waves through the body of water, and a similarly positioned receiver detects sound waves in the water and generates an electrical signal in response thereto. The electrical signal is continuously monitored, and the movement of a person in the pool alters the received ultrasonic sound waves and the corresponding electrical signal to produce an alarm signal for actuating an alarm indicator.

Method and apparatus for monitoring swimming pools

The invention comprises a self-adjusting ballast system for a high intensity discharge lamp. The ballast has a current limiter which modifies the lamp's present duty cycle to prevent damage if bulb rectification or another overcurrent condition occurs. It also has a current integration feedback loop for controlling lamp current during start-up.

High intensity discharge lamp self-adjusting ballast system with current

A self-adjusting ballast system for a high intensity discharge lamp. A lightweight, inexpensive and efficient ballast controls the strike and warmup stages of the high intensity discharge lamp, in particular high wattage lamps, through direct sensing of the radiant energy or heat output of the lamp itself. A current controller corrects for current imbalance in the alternating current lamp circuit due to bulb rectification or magnetic imbalance in the inverter transformer system.

High intensity discharge lamp self-adjusting ballast system sensitive to

An analog read-only memory system is provided for converting an input signal to an output signal functionally related to the antilog of the input signal. A resistor-capacitor network conveniently provides an analog memory circuit, converting a linear time base to an output voltage antilogarithmically related to the charging time. Solid state switching devices are actuated in response to control signals to initiate a memory sweep, or capacitor charging cycle, after a time interval determined by the input signal to form the desired antilog conversion; and transferring the output signal to a holding circuit until a subsequent output is provided. The memory sweep is periodically repeated to maintain an output in antilogarithmic relationship with the input.

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Houston, TX, United States of America

Donald S Kuhnel