Voltage regulator circuit for an electron microscope
OwnerSiemer Siemsinventor
Life of this patent
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Abstract
A voltage regulator circuit for an electron microscope incorporates step-down and step-up transformers connected between the filament supply and the filament of a regulator triode. The triode has a cathode separate from the filament, the cathode being connected to the center-tapped primary of the step-up transformer. A magnification-reducing resistor may be connected across the grid and cathode of the triode.
Claims5
In a high voltage regulator circuit, especially one adapted for use in an electron microscope, said circuit having a pair of supply voltage terminals across which a supply voltage is supplied, a voltage regulator tube having a plate electrode adapted to be coupled to a high voltage generator, a grid electrode adapted to be coupled to a high voltage amplifier, and a filament, coupled to said pair of supply voltage terminals, for receiving a filament supply voltage,
- the improvement wherein
- said tube further includes a cathode separate from said filament, and wherein said circuit further comprises
- a first transformer having a primary winding connected across said pair of supply voltage terminals and a secondary winding,
- a second transformer having a tapped primary winding, connected in parallel with the secondary winding of said first transformer, and a secondary winding connected across the filament of said tube, and
- wherein the cathode of said tube is connected to the tapped primary winding of said second transformer.
Dependencies are inferred from the claim text.