PROTECTIVE CIRCUIT - ABB TECHNOLOGY LTD

Title:

PROTECTIVE CIRCUIT

Document Type and Number:

WIPO Patent Application WO/2016/037335

Kind Code:

A1

Abstract:

Embodiments of the present disclosure provide a protective circuit to be used in a digital output module, the digital output module comprises a first voltage source (SI) and at least an output terminal. The protective circuit comprises: a first sampling unit (1) for sampling a first voltage relevant to the output current from the first voltage source (SI), a first comparing unit (2) for comparing the sampled first voltage with a first reference voltage (Vrefl), a control unit (3) for generating a current regulating signal based on a result from the first comparing unit (2), and a current regulating unit (4) for regulating the output current from the first voltage source (SI) based on the current regulating signal. This protective circuit provides overflowing and short circuit protection, and is cheap in cost.

Inventors:

LIU WEI (CN)
SHI HUAN (CN)
LOHBECK AXEL (CN)

Application Number:

PCT/CN2014/086282

Publication Date:

March 17, 2016

Filing Date:

September 11, 2014

Export Citation:

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Assignee:

ABB TECHNOLOGY LTD (CH)
LIU WEI (CN)
SHI HUAN (CN)
LOHBECK AXEL (CN)

International Classes:

H02H9/02

Foreign References:

CN202309017U	2012-07-04
CN102684507A	2012-09-19
CN102931629A	2013-02-13
JP2014154669A	2014-08-25
CN203026929U	2013-06-26
US20070188958A1	2007-08-16
CN103904628A	2014-07-02
CN203205843U	2013-09-18
CN103296642A	2013-09-11

Other References: