Title:
確実な電圧監視
Document Type and Number:
Japanese Patent JP3579425
Kind Code:
B2
Abstract:
PCT No. PCT/DE95/01730 Sec. 371 Date Jun. 9, 1997 Sec. 102(e) Date Jun. 9, 1997 PCT Filed Dec. 6, 1995 PCT Pub. No. WO96/18107 PCT Pub. Date Jun. 13, 1996A device for comparing two DC voltages (U1, U2) comprises a voltage comparator (3) having two inputs (9, 11). One of the two voltages (U1, U2) to be compared to each other is fed directly into one of the inputs (9, 11). The other voltage enters a voltage-conversion device (2) in which the voltage to be compared is superimposed with the DC voltage (8) so that a DC voltage arises at the output (7) of the voltage-conversion device (2), which voltage periodically fluctuates back and forth between an upper and a lower amplitude value in the cycle of the square-wave signal (8). The distance between the two amplitude values corresponds to the tolerance band within which the two voltages (U1, U2) to be compared with one another must be identical. The voltage signal obtained from the voltage-conversion circuit (2) enters the other input (9) of the voltage comparator (3), which then only supplies an AC signal at its output (15) if the upper amplitude value is greater than and the lower amplitude value is smaller than the DC signal fed into the other input (11) of the comparator (3).
Inventors:
Hans Dieter Schwenkel
Christoph Weisshar
Christoph Weisshar
Application Number:
JP51724196A
Publication Date:
October 20, 2004
Filing Date:
December 06, 1995
Export Citation:
Assignee:
Pilz Gezel Shaft Mitt Beschlenktel Haftung Und Company
International Classes:
G01R19/165; G05F1/46; H03K5/08; (IPC1-7): G01R19/165; H03K5/08
Domestic Patent References:
| JP63238566A | ||||
| JP59206773A | ||||
| JP63313077A | ||||
| JP63195578A |
Attorney, Agent or Firm:
Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Reinhard Einsel
Toshiomi Yamazaki
Takuya Kuno
Reinhard Einsel