Piezoelectric siren driver circuit
AssigneeMallory Sonalert Products, Inc.
InventorsChristopher Baldwin, George Burnett, Daniel O'Brien
Life of this patent
Estimating the term…
Abstract
A piezoelectric transducer driving circuit has a main oscillator stage, a buffer circuit, and a voltage-doubling circuit. The main oscillator stage includes a frequency-swept signal generator that can be configured to provide different outputs to the buffers, which in turn provide the output to the voltage-doubling circuit, which supplies the piezoelectric transducer, causing it to mechanically deform and produce audible sounds of different types.
Claims18
A circuit for generating electrical oscillations in the audible frequency range comprising:
- a frequency-swept signal generator, said generator selectively providing an output voltage varying in frequency;
- a logic circuit operatively connected to the output of the frequency-swept signal generator;
- and
- a piezoelectric transducer operatively connected to the output of the logic circuit, said transducer mechanically deforming in response to a signal from the logic circuit so as to produce audible oscillations thereby.
A piezoelectric driver circuit comprising:
- a frequency-swept signal generator providing an output varying in frequency;
- a logic circuit connected to and receiving the output of the frequency-swept signal generator;
- and
- a piezoelectric transducer connected to the output of the logic circuit, and mechanically deforming in response to the output of the logic circuit.
An electrical circuit for generating audible frequency oscillations comprising:
- a main oscillator stage including a frequency-swept signal generator in a circuit having resistive and capacitative elements configurable to produce at least two distinct frequency-varying outputs;
- a buffer circuit connected to and receiving the output from the main oscillator stage;
- a voltage-doubling circuit connected to and receiving the output of the buffer circuit;
- a piezoelectric transducer connected to and receiving the output of the voltage-doubling circuit;
- the buffer circuit isolating the main oscillator stage from the voltage-doubling circuit.
A circuit for generating electrical oscillations in the audible frequency range comprising:
- means for providing a selectably variable-frequency voltage;
- a logic circuit operatively connected to the means for providing a selectably variable-frequency voltage;
- and
- a piezoelectric transducer operatively connected to the output of the logic circuit, said transducer mechanically deforming in response to a signal from the logic circuit so as to produce audible oscillation thereby.
Dependencies are inferred from the claim text.