Voltage monitoring circuit and voltage monitoring method with hy

Details Voltage monitoring circuit and voltage monitoring method with hy Voltage monitoring circuit and voltage monitoring method with hy

1998-03-02

1999-11-30

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340661, 340662, 327 72, 327 74, G08B 2100

Patent

active

059950110

ABSTRACT:
A comparison circuit (4) is formed by a Schmidt buffer (4a) which has first and second threshold values and a buffer (4b) whose threshold value is larger than the first threshold value but smaller than the second threshold value. An integrating circuit (3) and the comparison circuit (4) function as a timer circuit which operates in accordance with comparison of the three values. An input signal (IN) decreases from a reference voltage signal (V6). A control signal becomes an H level after a time which is determined by a time constant of the integrating circuit (3) and the threshold value of the buffer (4b), and a detect signal (FO) is outputted after a time which corresponds to a difference between the second threshold value and the threshold value (which is equal to or shorter than a response time of the circuit (4)). During monitoring of a d.c. voltage which is applied to a drive circuit of a semiconductor element by means of a hysteresis operation, chattering of the detect signal is prevented which otherwise occurs despite an unstable hysteresis operation within a monitoring circuit when the d.c. voltage varies above and below a set value in a short period of time.

REFERENCES:
patent: 4613770 (1986-09-01), Raab
patent: 4951171 (1990-08-01), Tran et al.
patent: 4980791 (1990-12-01), Alberkrack et al.
patent: 5390068 (1995-02-01), Schultz et al.
patent: 5668465 (1997-09-01), May

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