Thomas E Kirkpatrick

US Patent:

52571564, Oct 26, 1993

Filed:

Mar 18, 1992

Appl. No.:

7/855362

Inventors:

Thomas I. Kirkpatrick - La Jolla CA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H02H 306
H02H 3093

US Classification:

361 18

Abstract:

A turn-on transient overcurrent response suppressor is connected to an exing electrical circuit having a regulator circuit that includes an overcurrent protection mechanism. A first charging circuit is connected to the power supply for simultaneous charging therewith. A second charging circuit is connected to the first charging circuit for delayed charging therewith. Connected between the first and second charging circuits is a circuit to create a low impedance discharge path for the second charging circuit while preventing discharge of the first charging circuit when the power supply is no longer providing the input voltage. First and second transistor circuits are connected to turn on during the charging and discharging of the second charging circuit and turn off when the second charging circuit is fully charged. In this way, turn-on transients caused by loss of AC power are prevented from falsely triggering the regulator circuit's overcurrent protection mechanism. The suppressor is particularly useful when a driven load is an active device.

US Patent:

53348818, Aug 2, 1994

Filed:

Mar 19, 1992

Appl. No.:

7/854112

Inventors:

Thomas I. Kirkpatrick - La Jolla CA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H03K 1756
H03K 17687
H03K 301

US Classification:

307241

Abstract:

A high isolation electronic switch is provided for selectively switching an utput line between first and second input lines. Each input line is connected to a respective circuit that has a first current carrying path to connect the respective input line to the output line, and a second current carrying path to connect a portion of the first current carrying path of the respective circuit to a ground potential. Each respective circuit is further selectively operated to conduct along only one of its first or second current carrying paths. A unity gain buffer is connected serially in the first current carrying path of each respective circuit. The switch is selectively operated such that one circuit conducts along its first current carrying path when the other circuit is conducting along its second current carrying path. A fixed impedance is connected between the output line and ground potential to minimize effects of conducting resistance when the first or second circuits are selectively operated to conduct along their respective first current carrying path, and to minimize capacitive leakage when the first or second circuits are selectively operated to conduct along their second current carrying path. A third unity gain buffer is connected serially in the output line to isolate the fixed impedance from the effects of a load connected to the output line.

US Patent:

50688324, Nov 26, 1991

Filed:

Feb 15, 1990

Appl. No.:

7/481421

Inventors:

Thomas I. Kirkpatrick - La Jolla CA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01S 1500

US Classification:

367 97

Abstract:

A frequency translator converts inaudible sounds into audible sounds while reserving the phase relationship of the sounds. The translator mixes a local reference frequency with an inaudible receive signal to translate the receive signal to an audible frequency. If the receive signal exceeds a predetermined value, the reference frequency gets shifted in phase to correspond to the phase of the receive signal at that moment. The resulting translated signal is thus in phase with the receive signal at the moment of shift, so that the time-of-arrival of the receive signal is not lost. When used individually in conjunction with left and right listening channels, the translator enables a listener to hear as well as sense the time-of-arrival of otherwise inaudible signals.