Flexducer preamplifier power controller

Details Flexducer preamplifier power controller Flexducer preamplifier power controller

1990-12-07

1991-10-15

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Transmitter systems

367900, 367903, H04B 102

Patent

active

050580833

ABSTRACT:
Linear and switching amplifiers associated with acoustic transducers requ a gradual turn-on rather than an abrupt full-power level signal. A transducer preamplifier power controller circuit prevents the operation of fuses and the tripping of circuit breakers when the relatively high power driving levels for a sonar transducer are initiated. The controller circuit gradually increases a signal level from a zero level to a maximum during the initiation of a sonar signal using a threshold level that is set to a fraction of the expected maximum, and two discrete clock frequencies, for example at 1 MHz and 2 KHz actuate interconnected digital control elements incrementally to increase the signal level during a predetermined period. This cycle is re-initiated by the next sonar signal.

REFERENCES:
patent: 913372 (1909-02-01), Gardner
patent: 3567961 (1971-03-01), Koechner
patent: 3939465 (1976-02-01), Helton et al.
patent: 4282452 (1981-08-01), Hassler et al.
patent: 4333347 (1982-06-01), Lang et al.
patent: 4841497 (1989-06-01), Bateman et al.

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