Electronically controlling acoustic energy from...

Details Electronically controlling acoustic energy from... Electronically controlling acoustic energy from...

2011-05-24

2011-05-24

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S2090SC, C315S224000, C315S246000, C315S274000

Reexamination Certificate

active

07948187

ABSTRACT:
A power-supply circuit is described. In particular, the power-supply circuit includes an input node configured to receive a power-supply signal, an output node configured to output a modulated power-supply signal, and a modulation mechanism coupled between the input node and the output node. This modulation mechanism is configured to modulate the power-supply signal to produce the modulated power-supply signal. Furthermore, the modulation mechanism may be configured to modulate the power-supply signal using both a first modulation and a second modulation. This first modulation is a duty-cycle modulation which controls the power output of the piezoelectric transformer signal, and the second modulation spreads harmonic energy associated with the first modulation over a range of frequencies. By spreading the harmonic energy, the perceived acoustical noise generated by the piezoelectric transformer is reduced.

REFERENCES:
patent: 4056786 (1977-11-01), Morrison et al.
patent: 5747914 (1998-05-01), Huang et al.
patent: 2007/0019935 (2007-01-01), Hsieh et al.

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