Electric power conversion systems – Current conversion – Having plural converters for single conversion
Patent
1987-11-05
1989-04-18
Salce, Patrick R.
Electric power conversion systems
Current conversion
Having plural converters for single conversion
363 17, 315106, 315308, H02M 700
Patent
active
048232505
ABSTRACT:
A power supply line has two to four lead wires which are selectively connectable with terminals (10a-10d) of a transformerless AC-to-DC converter (A). The lead wire interconnection scheme is selected (FIGS. 1A-1D) in accordance with whether the line signal is single phase or three phase and whether the line voltage is 220 or 440 volts. The AC-to-DC converter produces a 620 volt DC, signal across its outputs (26, 28). A first inverter (B) converts to a pulsed AC signal and applies it across opposite phased primary windings (46a, 46b) of a step up transformer (C). Two pair of alternately phased secondary windings (48a-48d) and rectifier bridges (50, 52) provide a high voltage DC bias across a cathode (54) and an anode (56) of an x-ray tube (D). A summing junction (66) compares a voltage sensed across the x-ray tube with a reference voltage and generates a voltage deviation signal. A deviation signal adjustment algorithm (68) adjusts the deviation signal in accordance with a ratio of the selected tube operating current and voltage. A pulse width modulator (82) controls the first inverter to control the duty cycle of the pulsed AC signal in accordance with the adjusted deviation signal. A second summing junction (102) compares sensed tube current with a reference tube current to produce a tube current deviation signal in accordance with the deviation therebetween. A second pulse width modulator (106) and a second inverter (F) apply a pulsed AC signal whose duty cycle varies in accordance with the deviation between the sensed and reference currents through the filament of the cathode.
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Fox, Jr. Harry W.
Kolecki Norman S.
Rarick Thomas L.
Peckman Kristine
Picker International Inc.
Salce Patrick R.
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