Piezoelectric loudspeaker with thermal protection

Details Piezoelectric loudspeaker with thermal protection Piezoelectric loudspeaker with thermal protection

1988-03-30

1989-09-05

Ng, Jin F.

Electrical audio signal processing systems and devices

Audio transducer protection circuitry

381 59, 381111, 330207P, H03G 1100, H04R 2900

Patent

active

048646245

ABSTRACT:
A preferred embodiment of a thermal protection circuit for a piezoelectric speaker includes a PTC resistor connected in series with the speaker and a second PTC nonlinear resistive element, such as a light bulb, connected in parallel with the resistor. This protects the speaker from failure due to overheating caused by excessive drive signals without causing audio distortion during infrequent excessive drive signals of a short duration.

REFERENCES:
patent: 3803359 (1974-04-01), Corderman
patent: 3959736 (1976-05-01), Grorjean
patent: 3965295 (1976-06-01), Evans et al.
patent: 4296278 (1981-10-01), Cullison et al.
patent: 4327250 (1982-04-01), Von Recklinghausen
patent: 4401857 (1983-08-01), Morikawa
Poly PTC Current Protector, Midwest Components Inc., Oct. 1986.

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