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  • 1
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    Aerospace technology development of three types of solid state remote power controllers for 120VDC with current ratings of five, and thirty amperes, one type having current limiting (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The first generation of remote power controllers (RPC) developed included: a 5-ampere design (Type 1), capable of limiting maximum overload current to 15 amperes for .1 sec; and 5-ampere noncurrent (Type 2) and 30-ampere noncurrent (Type 3) limiting designs, both with selectable instant trip levels for high-current overload. Each design provides overcurrent protection through an inverse I squared T trip-out function with an automatic reset option and demonstrates step-applied fault capability with a 4000-ampere surge, fast-risetime (low-inductance) power source. They also meet MIL - STD - 461A specification for electromagnetic interference. The second generation RPCs traded off specification compliance for reduction in cost and complexity for the Type 1 and 2 designs and give comparable or improved performance in most areas. The noncurrent limiting RPC proved to be a more economical and feasible method of overload protection for certain load types.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-CR-134772 , WAED-75-01E
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Solid state remote power controllers for 120 VDC power systems (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Remote Power controllers (RPCs) are devices that combine in one unit the capability to perform all the needed functions of load switching and provide total system protection of equipment and wires. The unique developments of solid-state RPCs for 120 Vdc power distribution systems are reviewed. The discussion covers design guidelines, power switch design concepts, and performance effectiveness. An NPN transistor is used as the the basic switch element. Since the ultimate goal of the 120 Vdc RPC program is to demonstrate technology readiness, the final phase is directed to the design, fabrication, and testing of multi-chip hybrid prototypes in hermetically sealed packages. RPCs have potential application in spacecraft and aircraft electrical systems, in transportation systems, and various industrial applications. The upper voltage limitation on the RPC design is related to the capability and availability of suitable high-voltage power transistors. The merits of solid-state RPCs are noted.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Annual National Relay Conference; April 27, 28, 1976; Stillwater, Okla
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Three types of solid state remote power controllers (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Three types of solid state Remote Power Controller (RPC) circuits for 120 Vdc spacecraft distribution systems have been developed and evaluated. Both current limiting and noncurrent limiting modes of overload protection were developed and were demonstrated to be feasible. A second generation of circuits was developed which offers comparable performance with substantially less cost and complexity. Electrical efficiency for both generations is 98.5 to 99%. This paper describes various aspects of the circuit design, trade-off studies, and experimental test results. Comparisons of design parameters, component requirements, and engineering model evaluations will emphasize the high efficiency and reliability of the designs.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Power Electronics Specialists Conference; Jun 09, 1975 - Jun 11, 1975; Culver City, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Solid state remote power controllers for 120 Vdc power systems (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Solid state Remote Power Controllers (RPCs) developed for use in any dc power system with voltage up to 120 Vdc and distributed power up to 3.6 kW per bus are described. The RPCs were demonstrated to be reliable, 99 percent efficient, comparatively simple, and potentially low in cost. Advantages of the RPCs include: contactless switching; controlled rates of current rise and fall; current limiting; and fast, well-defined, repeatable response to overloads and faults.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-TM-X-71874 , Ann. Natl. Relay Conf.; Apr 27, 1976 - Apr 28, 1976; Stillwater, OK; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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