Resources Contact Us Home
Method of and apparatus for selectively controlling a plurality of remotely located loads

Image Number 4 for United States Patent #3964023.

A master controller is connected via a pair of wires to a plurality of loads and is capable of generating pulses having either positive or negative polarity and a voltage level either above a first threshold or below a second threshold or above the second threshold. Some of the slave units connected via these two wires to the master controller are singly handicapped and have a single zener diode whose avalanche voltage corresponds to the first threshold so that the load is energized whenever this first threshold is exceeded. Other units have a second zener diode in series of the first diode and itself having an avalanche voltage equal to the second threshold so that only when this second threshold is exceeded is the load energized. In such a system it is possible to provide a memory circuit to short circuit this second zener diode if it is desired to remove the double handicap and partially emancipate the slave unit. This memory circuit may comprise a thyristor connected across the second zener diode so that if the voltage in the input lines to the slave unit drop to zero the emancipation command from the memory is eliminated. In addition some of the slave units are connected via full-wave rectification bridges to the two conductors so that regardless of the polarity of the pulses they are energized, whereas others of the units do not have such fall-wave rectification so that reversal of the signal polarity cuts these slave units out.

  Recently Added Patents
LED illumination control using a simple digital command structure
Method and apparatus for communicating electronic service guide information in a satellite television system
Integrated circuit packaging system with heat slug and method of manufacture thereof
Automatic population of feature capabilities on a communication device
Method for manufacturing a turbine engine vane
Methods and systems for time-shifting content
Mass spectrometry device and method using ion-molecule reaction ionization
  Randomly Featured Patents
Process for olefin polymerization
Unitary read-write head array for magnetic media
Plastic waste can for oily waste
Blade apparatus
Letter opener
Apparatus for cutting by means of a high pressure fluid jet
Linear pad conditioning apparatus
Topographical structure of an electrostatic chuck and method of fabricating same
Damper device, high pressure pump having the same and manufacturing method of the same
Power supply device preventing inrush current