Contour-clamped homogeneous electric field generator

Details Contour-clamped homogeneous electric field generator Contour-clamped homogeneous electric field generator

1988-04-21

1989-10-31

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323284, G05F 146

Patent

active

048780081

ABSTRACT:
A contour-clamped homogeneous electric field generator having a plurality of electrodes, each electrode being connected to a node which is maintained at a prescribed electrical potential. The electrical potential at the node is maintained by sourcing current into or sinking current away from the node when the voltage at the node varies. The current source comprises a first transistor having an input terminal connected to a voltage/current supply and an output terminal connected to the node. The current sink comprises a second transistor having an input terminal coupled to the node, and an output terminal coupled to the voltage/current supply ground. To control the operation of the first and second transistors, a comparator is coupled to the node for comparing a node-derived voltage to a reference voltage and for providing an oscillating pulse train in response thereto. The duty cycle of the pulse train varies in response to node voltage variation. The oscillating output of the comparator is communicated to an RC circuit which averages the voltages of the pulse train, and the averaged voltage is communicated to a control terminal of the second transistor. When the duty cycle of the pulse train increases, the increased average voltage turns on the second transistor for sinking current away from the node. When the duty cycle of the pulse train decreases, the first transistor turns on for injecting current into the node. The first and second transistors thus maintain the voltage at the prescribed level.

REFERENCES:
patent: 4276586 (1981-06-01), Boekhorst
patent: 4415790 (1983-11-01), Diesch et al.
patent: 4683415 (1987-07-01), Zimmerman

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