Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Method and system for electronic distribution of product redemption coupons
Method for controlling operation of a wind turbine
Particle-loaded membrane for solid-phase-extraction and method for performing SALDI-MS analysis of an analyte
Error protection for pipeline resources
Hoists
System and method for redirected firewall discovery in a network environment
Solid-state imaging device, method for manufacturing solid-state imaging device, and electronic apparatus
  Randomly Featured Patents
Magnetic transfer method for a high-density magnetic recording medium
Hand-held power tool with air spring percussion mechanism, linear motor, and control process
Higher performance barrier materials for containers of environmentally sensitive semiconductor fabrication devices
Low power mode for device power management
Process for production of antibiotics and novel antibiotics produced thereby
Dust sensor apparatus
Device for tightly fastening at least two members
Apparatus for destroying dividing cells
Accessory housing for skate, skateboard, bicycle or the like
Trajectory-based 3-D games of chance for video gaming machines