Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1977-02-22
1981-02-24
Pellinen, A. D.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323285, G05F 158
Patent
active
042530555
ABSTRACT:
A high efficiency current regulator control circuit used to adjust and accurately control current flow in a substantially resistive load such as the low resistance filament in an electron gun of an electron microscope. The efficiency is obtained by running a solid state device such as a transistor in a switching mode. The present circuit represents an advantage over previous circuits which utilized a series or shunt pass regulator which dissipates power in performing the regulation function. The present circuit utilizes a switching mode regulator which regulates by switching a fast transistor either full "on" or full "off" in response to current flow through a sensing resistor. The ratio of "on" to "off" time determines the current transfer. It is a requirement of the circuit that the sensing resistor be of a material having an extremely low temperature coefficient such that the current flow through the resistive element and the resulting inherent heating of the element do not substantially affect its resistive characteristics.
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patent: 3969652 (1976-07-01), Herzog
American Optical Corporation
Duggan Jeremiah J.
Pellinen A. D.
Spencer Alan H.
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