Current-limiting circuit

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Nonlinear amplifying circuit

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Details

327563, 327427, 330254, H03F 345, H03G 300

Patent

active

054225930

ABSTRACT:
A current-limiting circuit provides prevention of an oscillation phenomenon resulting from a feedback of the current-limiting signal, which is generated by the output of an operational amplifier, to an input of the operational amplifier via a current-mirror element. Gain adjusting elements are connected between a first input terminal of the operational amplifier and the common control terminal, and between the first input terminal and the current-mirror terminal, respectively. The gain adjusting elements' impedance ratio is used to adjust the feedback gain and thereby prevent the oscillation phenomenon. Furthermore, inputting a selected analog voltage into a second input terminal of the operational amplifier maintains the currents constant at two or more desired levels. In addition, a constant voltage source that can be used even with a low power source voltage, and which is suitable for a current-limiting circuit, is provided by connecting a depletion-type MOSFET and an enhancement-type MOSFET in series.

REFERENCES:
patent: 4553084 (1985-11-01), Wrathall
patent: 4634902 (1987-01-01), Tanaka et al.
patent: 4954728 (1990-09-01), Pavlin
patent: 5013934 (1991-05-01), Hobrecht et al.
patent: 5157322 (1992-10-01), Llewellyn
patent: 5159516 (1992-10-01), Fujihira
"Bipolar and MOS Analog Integrated Circuit Design" by A. B. Grebenn, Published by John Wiley Sons, N.Y.; pp. 193-209.
"How Current Sense Technology Improves Power Mosfet Switching Applications" by D. L. Zaremba, Jr.; Electron Mini/Micro Northeast Conf. Rec. 1986, pp. 10/4.1 to 10/4.4.
IBM Technical Disclosure Bulletin, vol. 25, No. 7B, Dec. 1982, pp. 3363 and 3364, D. R. Presley, W. R. Yount, "Constant Current Source for Energizing Active Inductive Loads".

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