HIGH GAIN RELAYS AND SYSTEMS
 Inventors: Ernest M. Jost, Plainville; Lyle E.
McBride, Jr., Norton; Teuvo J.
Santala, Attleboro, all of Mass.
 Assignee: Texas Instruments Incorporated,
 Filed: Jan. 7, 1974  Appl. No.: 431,539
Related U.S. Application Data
 Division of Ser. No. 351,683, April 16, 1973, Pat. No. 3,893,055.
 U.S. CI 307/99; 337/140
 Int.CI.2 H01H 47/02
 Field of Search 307/99; 337/140;
333/32, 35; 317/157, 156 TR; 219/501, 504,
 References Cited
UNITED STATES PATENTS
3,374,337 3/1968 Barley 219/499
3,417,228 12/1968 Little 219/505
3,516,082 6/1970 Cooper 337/140
3,554,680 1/1971 Malavasi 431/78
3,665,159 5/1972 Becker et al 219/497
3,718,924 211973 Trybert et al 219/499
Primary Examiner—David Smith, Jr.
Attorney, Agent, or Firm—John A. Haug; James P.
McAndrews; Russell E. Baumann
 ABSTRACT The disclosure relates to high gain electrical relays which are operable at very low power levels and which, when arranged in a relay system with impedance matching to an energizing power source, are operable at the low power levels used in energizing integrated circuits. The relays utilize nickel-titanium alloy wires which are conditioned and arranged to display sharp, reversible changes in shape and modulus of elasticity as the wires are heated and cooled through a temperature transition range, the alloy wires being disposed, preferably with impedance matching means between the wires and energizing power sources, to be heated through the noted transition temperature range by directing current from such low power sources through the wires, thereby to initiate relay operation. The relay construction provides unusually high gain so that relay operation from such low power sources is effective for regulating operation of various types of components used in electrical apparatus.
11 Claims, 17 Drawing Figures