Fail-safe circuit

US5825102A · kind A · utility

Assignee

• Gebr. Schmidt Fabrik für Feinmechanik · DE

Inventors

• Hartmut Babiel · St. Georgen, DE
• Konrad Mauch · Dunningen, DE

Key dates

• Filing date: Jun 19, 1997
• Grant date: Oct 20, 1998
• Expiry date: Jun 19, 2017

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01H47/005
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

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 w…