Franklin B. Jones

Ten kilowatt self-commutated resonant inverter using MOS controlled thyristors

A 50 kHz full-bridge series/parallel resonant inverter has been developed to provide a 10 kW high-voltage output from 270 V DC input power. The inverter uses MOS controlled thyristors as self commutated switches. Multilayer ceramic chip capacitors and gapped ferrite planar inductors serve as resonant elements to allow high power density. The design, computer simulation, and breadboard evaluation of the inverter are described.<<ETX>>

Optimum topology of a self-commutated resonant inverter

A 10 kW, 50 kHz resonant inverter development effort for a radar transmitter application is presented. Well-behaved and constant loads are not assumed in order to show topology function; rather, the parameters used are a real life set with variations that pose severe design problems. The tradeoffs for circuit topology selection are outlined, and the final high-power full-bridge hybrid topology is shown. An equivalent lower-power half-bridge version of the same hybrid topology is developed. The equivalence is nonobvious. Computer circuit simulations and measured data are used to show performance.<<ETX>>

Hybrid packaging technique for high power density circuit

Downsizing or miniaturizing power circuits for the 1990s power conversion technologies requires high and very high power density (greater than 100 watt/in/sup 3/) packaging capability. Among different packaging techniques, the hybrid packaging technique is preferred for many applications because it has a good reliability history. This technique utilizes newly developed processes and materials such as direct bonded copper and diamond coated substrates to significantly improve thermal management and achieve optimal thermal resistance (less than 0.4 degrees C/watt). A 124 watt/cm/sup 2/ (800 watt/in/sup 2/) power density hybrid packaging example is presented here. The results of thermal design and evaluation of this hybrid are discussed.<<ETX>>

A Stability Tester for MTI Radar Transmitters

Modern radars rely heavily on multiple coherent pulses for reduction of clutter. This has become more important in the case of military radar. Discusses stability testingf for MTI radar transmission.