Method and apparatus for protection of electronic circuitry

Details Method and apparatus for protection of electronic circuitry Method and apparatus for protection of electronic circuitry

1996-08-30

1997-12-02

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

H02M 3335

Patent

active

056943059

ABSTRACT:
Protection circuitry incorporates detection circuitry and first and second timer circuits to protect power supply apparatus and associated circuitry from damage due to excessive voltages and/or currents. The detection circuitry initiates the first timer upon detecting potentially damaging voltages and/or currents, caused by, for example, a source or load impedance far different from that for which the power supply apparatus is designed. If the abnormal voltages and/or currents persist for longer than a first period of time, the first timer initiates a second timer that reduces the power output of the power supply apparatus for a second period of time. After expiration of the second period of time, the power supply apparatus returns to normal operation. The cycle described above an repeat indefinitely if necessary to protect against, for example, a sustained short circuit. Incorporation of two timers allows the power supply apparatus to properly power variable loads, such as a motor, that initially draw large current but that do not represent an abnormal load impedance, and to adequately protect the apparatus and associated circuitry from damage.

REFERENCES:
patent: 4263643 (1981-04-01), Koike
patent: 4685020 (1987-08-01), Driscoll et al.
patent: 5325282 (1994-06-01), Bansard
patent: 5513089 (1996-04-01), Sudo et al.
BiCMOS Current-Mode PWM Controller Preliminary Information, MICREL Product Data Sheet, pp. 4-63 undated.
"UC3842/3/4/5 Provides Low-Cost Current-Mode Control", UNITRODE Integrated Circuits Product & Applications Handbook 1993-1994, pp. 9-62 to 9-69.
"A New Linear Regulator Features Switch Mode Overcurrent Protection", UNITRODE Integrated Circuits Product & Applications Handbook 1993-1994, pp. 9-189 to 9-194.
"Low-Power BiCMOS Current-Mode PWM", UNITRODE Integrated Circuits Product & Applications Handbook 1993-1994, pp. 5-319 to 5-322.
"UC3842A Low Cost Start-Up And Fault Protection Circuit", UNITRODE Integrated Circuits Product & Applications Handbook 1993-1994, Design Note DN-26, pp. 9-486 to 9-487.
"UC3842A Family Frequency Foldback Technique Provides Protection", UNITRODE Integrated Circuits Product & Applications Handbook 1993-1994, Design Note DN-29, p. 9-490.
"Programmable Electronic Circuit Breaker", UNITRODE Integrated Circuits Product & Applications Handbook 1993-1994, Design Note DN-30, p. 9-491.

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