Electric power conversion systems – Cascaded or combined – diverse conversions in which the... – Current and frequency
Patent
1987-08-24
1988-05-10
Wong, Peter S.
Electric power conversion systems
Cascaded or combined, diverse conversions in which the...
Current and frequency
363128, 363157, 323908, H02M 7155
Patent
active
047440171
ABSTRACT:
A high tension power supply for use in an x-ray tube drive circuit which uses a step-up transformer to raise an input line signal to the desired voltage level. A partially open bridge or other suitable means permits only half cycles, for example positive half cycles, of the transformer output to be applied to fire the x-ray tube. Saturation of the transformer core during unused half cycles, for example negative half cycles, is prevented by adding a compensating impedance in series with the circuit passing the unused half cycle to the transformer primary, the increased voltage drop across this impedance as current increases in response to the transformer approaching saturation reducing the voltage across the transformer so as to maintain the average voltage across the windings during both half cycles substantially equal. This achieves "constant phase" exposures without transformer saturation.
REFERENCES:
patent: 3303405 (1967-02-01), Schwarz
patent: 3544913 (1970-12-01), Anderson
patent: 3636355 (1972-01-01), James et al.
patent: 4554476 (1987-05-01), Masuda
patent: 4614999 (1986-09-01), Onodera et al.
Oliverio M. Lawrence
Wong Peter S.
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