Device for detecting cutoff and short circuit defects in at leas

Details Device for detecting cutoff and short circuit defects in at leas Device for detecting cutoff and short circuit defects in at leas

1989-05-02

1989-12-26

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 87, 3611691, 361187, H02H 300

Patent

active

048901830

ABSTRACT:
The invention relates to a device for detecting cutoff and short circuit defects in at least one electrical circuit portion. The detecting device (10) is intended to verify a circuit portion (11) connected to the terminals of a source of direct current (T1) and including a passive element (E, r) interposed between two switch devices (P, Q) comprises on the one hand four differential amplifiers (AD1, AD2, AD3 and AD4) each having one of their inputs connected to the common terminal (F) of the passive element (E, r) and to the first switch device (P) and their other input connected to a reference potential (V3 or V.sub.4), and on the other hand another voltage source (T2) and two resistors (R1 and R2) which are selected such that in the case of short-circuiting of the devices (P and Q), a signal appears at the output (X1 or X2) of one of the amplifiers AD1 and AD2, while in the case of cutoffs in one or the other of the circuit portions located on either side of this terminal (F)< a signal appears at the output (X3 or X4) of one or the other amplifier (AD3 and AD4). The invention relates to monitoring of circuits that control the excitation of recording heads in magnetic recording apparatus.

REFERENCES:
patent: 3771048 (1973-11-01), Bond et al.
patent: 4065802 (1977-12-01), Mizukawa et al.
patent: 4470041 (1984-09-01), Sutherland et al.
patent: 4661766 (1987-04-01), Hoffman et al.
patent: 4783714 (1988-11-01), Kalina
IBM Tech. Disc. Bul., vol. 24, No. 7B, Dec. 1981, pp. 3743-3744.

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