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Title:
FREE-WHEELING CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2011/038969
Kind Code:
A3
Abstract:
The invention relates to a free-wheeling circuit for the rapid reduction of a shutdown overvoltage of an inductive load (1) when the latter is shut down. The free-wheeling circuit comprises a switching threshold component (11) by which the free-wheeling circuit becomes active more rapidly compared to a free-wheeling circuit without said switching threshold component (11), thereby ensuring a more rapid reduction of the shutdown overvoltage. If a control voltage provided by a control voltage source (2) falls below a threshold voltage set by the switching threshold component (11), a capacitive energy accumulator is immediately discharged and not only when the control voltage is reduced to near zero, and said energy accumulator then activates the free-wheeling circuit for reducing the shutdown overvoltage, when in the nearly discharged state.

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JPH0963807ARRESTER
Inventors:
OPPERMANN CHRISTIAN (DE)
STREICH BERNHARD (DE)
Application Number:
EP2010/061621
Publication Date:
April 18, 2013
Filing Date:
August 10, 2010
Export Citation:
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Assignee:
SIEMENS AG (DE)
OPPERMANN CHRISTIAN (DE)
STREICH BERNHARD (DE)
International Classes:
H02H9/04
Foreign References:
DE19519757A11996-12-12
DE10228340B32004-02-26
DE29503146U11995-04-13
JPS59181004A1984-10-15
Attorney, Agent or Firm:
SIEMENS AKTIENGESELLSCHAFT (Postfach 22 16 34, M√ľnchen, 80506, DE)
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