Weighted transducer and driving circuit with feedback

Details Weighted transducer and driving circuit with feedback Weighted transducer and driving circuit with feedback

B - Operations, Transporting

60

Q

B60Q 5/00 (2006.01) B60Q 1/22 (2006.01) H01L 41/04 (2006.01) H04R 3/00 (2006.01) H04R 17/00 (2006.01) H04R 17/10 (2006.01)

Patent

CA 2090481

A sound generating device which increases the effectiveness of the sound generated by mechanically coupling a weight to a piezoelectric element. This sound generating device may find particular application in a combination backup light and sound generating device utilized in an automotive vehicle. Also, circuitry for driving a piezoelectric element at its resonant frequency when the driving signal is applied to the piezoelectric element across a step-up transformer. The circuitry features a feedback signal which detects the frequency at which the piezoelectric element is vibrating. This feedback signal is then subjected to low-pass and high-pass filtering to remove any phase shifts resulting from applying the driving signal across the step-up transformer. This filtered feedback signal is then utilized to control the driving signal.

L'invention est un dispositif générateur de sons dont l'efficacité a été accrue par l'utilisation d'un couplage mécanique entre un poids et un élément piézoélectrique. Ce générateur peut être particulièrement utile dans un véhicule automobile quand il est combiné au dispositif d'allumage des feux de recul. L'invention comporte également un circuit à transformateur-élévateur qui sert à produire les signaux d'attaque de l'élément piézoélectrique à la fréquence de résonnance de ce dernier. Ce circuit utilise un signal de retour qui détecte la fréquence d'oscillation de l'élément piézoélectrique. Ce signal de retour est transmis à des filtres passe-bas et passe-haut pour en éliminer tout déphasage résultant du passage du signal d'attaque dans le transformateur-élévateur. Ce signal de retour filtré est ensuite utilisé pour commander le signal d'attaque.

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