System for connecting and disconnecting power source terminals to a load for time proportional to the current drawn by the load
AssigneeCombustion Engineering, Inc.
InventorsFloyd L. Prestridge, Harry G. Wallace
Life of this patent
Estimating the term…
Abstract
The essential elements of the electrical system of a treater, or dehydrator, of produced oil well fluids are connected and physically oriented as mounted within the shell of the treater. The electrodes of the treater are energized from a line supply and establish electrostatic fields as a varying load on the electrical system. A control circuit is arranged to respond to the current demanded by the varying load and disconnect the load from the line supply in a predetermined program designed to protect the components of the system, yet reconnect the load and supply as frequently as practical.
Claims7
A system for supplying electrical power to a varying load, including,
- a pair of a.c. power source terminals;
- means adapted to connect the terminals to the load;
- an electronic switch means in circuit between the terminals and the connecting means and having a gate electrode, the electronic switch responding to a gate drive signal generated from the a.c. power source to disconnect the terminals and connecting means for one half and multiples of one half cycle of alternate polarity of the a.c. source voltage and connect the terminals and connecting means at zero crossing of the a.c. source voltage for one half and multiples of one half cycle of alternate polarity of the source voltage;
- a drive circuit generating and programming the gate drive signal and connected to the gate electrode of the electronic switch, including:
- a. A generator of the gate drive signal connected to the gate electrode and adapted to be connected to the a.c. power source,
- b. A disconnect circuit for effectively disconnecting the generator from the gate electrode in response to an electrical signal, the disconnect circuit connected to the generator and a source of power,
- c. And a delay section circuit to generate the programmed electrical signal to the disconnect circuit and connected to receive an input signal;
- and means for sensing the current applied to the load as an input signal and connected to provide the input signal to the delay section of the drive circuit, whereby the source terminals are connected to the load at zero crossing of the a.c. source voltage for those intervals in which the power demanded by the load is within the continuous operative range of the components of the system and disconnected for one half and multiples of one half cycle of alternate polarity of the source voltage.
Dependencies are inferred from the claim text.