Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1985-08-29
1987-02-10
Wong, Peter S.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 16, 363 41, H02M 3335
Patent
active
046427481
ABSTRACT:
A method and circuitry are disclosed for monitoring the performance of a switching system such as a switch mode converter by monitoring the duty cycle of the system. With respect to a switch mode converter, its duty cycle is a parameter which determines whether or not the converter is in jeopardy of loosing its ability to regulate an output voltage. As long as the duty cycle of the converter is below a given threshold, which may approach 100 percent, the converter has the ability to continue regulating the output voltage. The method and circuitry disclosed herein monitor a signal of the converter having a duty cycle related to the duty cycle of the converter and provide a signal indicating when the duty cycle of the converter is equal to or greater than a predetermined threshold duty cycle.
REFERENCES:
patent: 4137556 (1979-01-01), Sessa
patent: 4159515 (1979-06-01), Walkowiak
patent: 4218647 (1980-08-01), Hass
patent: 4245289 (1981-01-01), Mineck et al.
patent: 4288831 (1981-09-01), Dolikian
patent: 4321663 (1982-03-01), Krtek
Jones Judson H.
Mai Basic Four, Inc.
Wong Peter S.
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