Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1986-06-06
1987-08-11
Salce, Patrick R.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 21, 363 97, 361 93, H02H 7122, H02M 3335
Patent
active
046866175
ABSTRACT:
A constant-current, current-programmed dc-to-dc converter includes a controllable switch and an inductor. The switch is rendered conductive in response to a recurrent clock signal, and nonconductive in response to a comparison of a voltage representing the inductor ramp current with an output voltage error signal from a high impedance source, which establishes an output voltage control feedback loop. An overcurrent limiting circuit includes a current sensor having a low output impedance which produces a load current representative signal. The load current representative signal is applied to an amplifier having a low output impedance and which includes a diode in its feedback loop to maintain it nonsaturated. A second diode is connected to the output of the amplifier and to the high impedance output terminal of the error voltage source to close a current limiting degenerative feedback loop which swamps the error voltage when the second diode becomes conductive due to excess load current. This reduces the peak value of inductor current sufficient to maintain the desired load current limit. If the amplifier fails open-circuit, both diodes conduct to the low impedance current sensor and continue to provide load overcurrent protection.
REFERENCES:
patent: 4047235 (1977-09-01), Davis
patent: 4218613 (1980-08-01), Bletz
patent: 4327268 (1982-04-01), Frank
patent: 4524412 (1985-06-01), Eng
patent: 4586120 (1986-04-01), Malik et al.
patent: 4616301 (1986-10-01), Small
An article entitled "Modelling and Analysis of Switching DC-to-DC Converts in Constant Frequency Current-Programmed Mode", by HSU et al., published 1979 by IEEE, pp. 248-301.
Berard Jr. Clement A.
Meise William H.
RCA Corporation
Salce Patrick R.
Todd Voeltz Emanuel
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