Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1991-02-26
1992-05-19
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
361106, 363132, H02H 7122
Patent
active
051153882
ABSTRACT:
In an inverter which converts a DC voltage input into AC voltage outputs of different phases, power transistors are arranged in an upper arm and a lower arm of the inverter. The temperatures of the power transistors in the upper arm are monitored by individual temperature sensors connected to overheat protection circuits. When an overcurrent flows through any one of the power transistors in the upper arm in a short-circuit situation, that power transistor is overheated. An alarm signal is initiated by the corresponding overheat protection circuit once the temperature of the power transistor is sensed to have exceeded a predetermined value. In response to this alarm signal, all of the power transistors are turned off and, thus, accorded protection.
REFERENCES:
patent: 4360852 (1982-11-01), Gilmore
patent: 4965710 (1990-10-01), Pelly et al.
Crisafi et al, "Thermistor-Module Thermoprotector," IBM Tech. Discl. Bul., vol. 12, No. 7, pp. 906, 907, Dec. 1969 (361-106).
Beha Jr. William H.
Fuji Electric & Co., Ltd.
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