External electrical energy supply for field device

Details External electrical energy supply for field device External electrical energy supply for field device

2007-07-13

2010-02-16

Nguyen, Matthew V (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

Reexamination Certificate

active

07663350

ABSTRACT:
A field-device electronics for a field device. The field device electronics is supplied from an external electrical energy supply providing a supply voltage and delivering a variable supply current driven by the supply voltage. The field-device electronics includes an internal control unit for controlling the field device, as well as at least one internal supply circuit feeding the internal control unit. The supply current is a mixed current formed by superimposing and/or modulation of an alternating current portion onto a direct current portion. The internal supply circuit uses, at least at times and/or at least in part, also the alternating current portion of the mixed current for covering an instantaneous energy requirement of the control unit.

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patent: 5436550 (1995-07-01), Arakawa
patent: 6269012 (2001-07-01), Kusakabe et al.
patent: 6373735 (2002-04-01), Usui
patent: 6397322 (2002-05-01), Voss
patent: 2003/0074500 (2003-04-01), Takeuchi
patent: WO 02/103327 (2002-12-01), None

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