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  • 1
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    A new inverter topology using GTO commutation (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A new N-phase, forced commutated bridge inverter topology has been developed wherein a single Gate Turn Off Thyristor (GTO) is used to commutate each of 2N main Thyristors (SCRs). Since, for most applications, the primary loss mechanism is the SCR forward drop, very high efficiencies are possible. Compared with conventional pure SCR and pure GTO inverters, cost per kW is lower - in the former case due to the large cost differential between GTOs and SCRs. Other advantages of the new inverter include high power density, low switching losses and stresses, modulation flexibility and amenability to high voltage and high frequency operation.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
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    NASA TECHNICAL REPORTS
  • 2
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    Alternating-Current Motor Drive for Electric Vehicles (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: New electric drive controls speed of a polyphase as motor by varying frequency of inverter output. Closed-loop current-sensing circuit automatically adjusts frequency of voltage-controlled oscillator that controls inverter frequency, to limit starting and accelerating surges. Efficient inverter and ac motor would give electric vehicles extra miles per battery charge.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-14768 , NPO-14830 , NASA Tech Briefs (ISSN 0145-319X); 6; 2; P. 128
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    NASA TECHNICAL REPORTS
  • 3
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    Improved battery charger for electric vehicles (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Polyphase version of single-phase "boost chopper" significantly reduces ripple and electromagnetic interference (EMI). Drive circuit of n-phase boost chopper incorporates n-phase duty-cycle generator; inductor, transistor, and diode compose chopper which can run on single-phase or three-phase alternating current or on direct current. Device retains compactness and power factors approaching unity, while improving efficiency.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-14964 , NASA Tech Briefs (ISSN 0145-319X); 5; 4; P. 411
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    NASA TECHNICAL REPORTS
  • 4
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    Energy-Saving Inverter (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Commutation by field-effect transistor allows more efficient operation. High voltage field-effect transistor (FET) controls silicon controlled rectifiers (SCR's). Circuit requires only one capacitor and one inductor in commutation circuit: simpler, more efficient, and more economical than conventional inverters. Adaptable to dc-to-dc converters.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-15291 , NASA Tech Briefs (ISSN 0145-319X); 8; 2; P. 168
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    NASA TECHNICAL REPORTS
  • 5
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    Simplified High-Power Inverter (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Solid-state inverter simplified by use of single gate-turnoff device (GTO) to commutate multiple silicon controlled rectifiers (SCR's). By eliminating conventional commutation circuitry, GTO reduces cost, size and weight. GTO commutation applicable to inverters of greater than 1-kilowatt capacity. Applications include emergency power, load leveling, drives for traction and stationary polyphase motors, and photovoltaic-power conditioning.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-15961 , NASA Tech Briefs (ISSN 0145-319X); 8; 2; P. 167
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    NASA TECHNICAL REPORTS
  • 6
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    Improved Two-Phase Switching Regulator (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Coupled-inductor polyphase regulator has better efficiency and lower inductor losses. Improved two-phase switching regulator employs negative coupling between inductors to achieve better power-to-weight ratio while reducing peak switching currents and inductor losses. Improvement of about 35 percent using new technique.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-15172 , NASA Tech Briefs (ISSN 0145-319X); 8; 1; P. 17
    Format: text
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    NASA TECHNICAL REPORTS
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