Fail-safe circuit

Details Fail-safe circuit Fail-safe circuit

1997-06-19

1998-10-20

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307326, 307113, 307116, 307134, 361166, 361195, 361189, H02B 124, H02H 4787

Patent

active

058251022

ABSTRACT:
A fail-safe circuit (10) comprises a storage battery (11) for electrical charges as well as a first charge path (12) which optionally connects the storage battery (11) to a first potential (UL). A second charge path (14) and a third charge path (15) optionally connect the storage battery (11) with a second or third potential (UE1, UE2). The first and second switching devices (16, 17), which operate as function of the first and second switching events (TA, TB), each comprise a first and second switching contact (A1, B1) in the first charge path (12) and a second switching contact (A2, B2) in the second and third charge path (14, 15). The actuation coils (LC, LD) of the third and fourth switching devices (18, 19) are in the second and third charge path (14, 15) and each have a first switching contact (C1, D1) in the first charging path (12) and a second contact (C2, C2', D2, D2'). All of the first contacts (A1, B1, C1, D1) in the first charging path (12) are connected in such a way that they only enable a charging of the storage battery (11) from the first potential (UL) in their neutral position. The components in the second and third charging paths (14, 15) are switched in such a way that the second switching contacts (A2, B2) reverse charge the storage battery (11) to the charge potential (UE1, UE2) via the respective actuation coil (LC, LD) in their working position. The second switching contacts (C2, C2', D2, D2') of the third and fourth switching devices (18, 19) are furthermore switched in such a way that a further switching event is only triggered when both switching contacts (C2, C2', D2, D2') are in their working position.

REFERENCES:
patent: 3793533 (1974-02-01), Ginsberg
patent: 4054935 (1977-10-01), Ginsberg
patent: 4091438 (1978-05-01), Olding et al.
patent: 4562359 (1985-12-01), Herzig
patent: 5212621 (1993-05-01), Panter
German published regulation, No. VDI 2854, Institute For Labour Safety Of The Employer's Liability Insurance Association, St. Augustin, Jun. 1991, 12 pages.

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