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US 4,736,192 AGranted
Excitation circuit for piezo-electric sound generators
AssigneeSiemens Aktiengesellschaft
InventorRichard Angerer
Life of this patent
Estimating the term…
Abstract
An excitation circuit wherein the energy of a charged coil is discharged via a sound generator. A coil and a capacitance of the sound generator are tuned to one another such that a corresponding oscillatory frequency is identical to a predetermined resonant frequency of the sound generator.
Claims6
An excitation circuit, comprising:
- a piezo-electric sound generator;
- power supply terminals;
- an inductance in series with the sound generator between the power supply terminals;
- switch means in parallel with said sound generator, and in series with said inductance across said power supply terminals;
- a value of said inductance and a value of a capacitance of said sound generator being chosen with respect to one another such that a tuned frequency of a resulting oscillation circuit formed by said inductance and sound generator capacitance is identical to a predetermined resonant frequency of said sound generator.
2 more elements
An excitation circuit, comprising:
- a piezo-electric sound generator;
- a power supply having first and second terminals;
- an inductor connected in series with the sound generator across the first and second terminals;
- switch means connected in parallel with the sound generator and in series with the inductor for periodically connecting the inductor across the supply voltage terminals;
- and
- an inductance of the inductor being chosen such that in combination with a capacitance of the sound generator a tuned circuit is formed having a frequency identical to a resonant frequency of the sound generator.
3 more elements
Dependencies are inferred from the claim text.