Controlling apparatus for high frequency high voltage power sour

Details Controlling apparatus for high frequency high voltage power sour Controlling apparatus for high frequency high voltage power sour

1993-10-25

1996-01-23

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363137, H02M 544

Patent

active

054869935

ABSTRACT:
A controlling apparatus for a high frequency high voltage power source is disclosed which eliminates a switching loss of a high frequency invertor and allows adjustment of the output power to be performed continuously and accurately over a wide range. A resonance current of a resonance circuit of the high frequency high voltage power source is detected by current detection means, and a phase locked loop circuit locks itself with a frequency with which it coincides in phase with the resonance current to produce a synchronized pulse signal. From the pulse signal, a signal having a zero voltage outputting period of a preset duration is formed by a pulse density modulation circuit to change the pattern of a gate signal for switching semiconductor elements of a high frequency invertor to adjust the output power. An input voltage before a zero voltage outputting period is entered is stored into voltage storage means such as a sample and hold circuit so that the phase locked loop circuit may continue to lock with the same frequency also during the zero voltage outputting period.

REFERENCES:
patent: 5062031 (1991-10-01), Flachenecker et al.
patent: 5099410 (1992-03-01), Divan
patent: 5245520 (1993-09-01), Imbertson
patent: 5267138 (1993-11-01), Shores

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