Inverter power source apparatus using a piezoelectric transforme

Details Inverter power source apparatus using a piezoelectric transforme Inverter power source apparatus using a piezoelectric transforme

1996-09-03

1998-08-18

Pascal, Robert

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315224, 315307, 315209PZ, 310316, 310318, H05B 3702

Patent

active

057962138

ABSTRACT:
An inverter power source apparatus using a piezoelectric transformer, has: variable oscillating device for oscillating a pulse signal; pulse-width changing device for changing a width of said pulse signal of said variable oscillating device; driving device for generating a driving signal on the basis of an output of said pulse-width changing device; a piezoelectric transformer which is driven by said driving signal, drives a predetermined load, and has input and output electrodes; detecting device for detecting a relationship between said driving signal and a resonance frequency of said piezoelectric transformer, and for, on the basis of a result of the detection, controlling a frequency of said oscillation signal of said variable oscillating device so that a difference between said resonance frequency and a frequency of said driving signal is substantially within a preset range; and pulse-width controlling device for, when a detection results of said detecting device shows that said difference between said resonance frequency and said frequency of said driving signal is substantially within said preset range, controlling said pulse-width changing device so that a current flowing through said load is substantially constant.

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Patent Abstracts of Japan, vol. 016, No. 240 (E-1211), 3 Jun. 1992 & JP 04 049846 A (NEC Corp.), 19 Feb. 1992.
Patent Abstracts of Japan, vol. 017, No. 668 (E-1473), 9 Dec. 1993 & JP 05 219730 A (Toshiba Corp.), 27 Aug. 1993.
Patent Abstracts of Japan, vol. 000, No. 00000 & JP 08 149850 A (Tokin Corp.), 7 Jun. 1996.

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