EP 0518916 A4 19921019 - MULTIFUNCTION ISOLATION TRANSFORMER.
Title (en)
MULTIFUNCTION ISOLATION TRANSFORMER.
Title (de)
MEHRFUNKTIONSISOLATIONSTRANSFORMATOR.
Title (fr)
TRANSFORMATEUR D'ISOLEMENT MULTIFONCTIONS.
Publication
Application
Priority
- US 9101210 W 19910221
- US 48306290 A 19900221
Abstract (en)
[origin: WO9113417A1] A process transmitter (50) transmits a 4-20 mA current representing a sensed parameter to a loop (52) which energizes the transmitter (50). An output circuit (60) receives energization from the loop (52) and controls the 4-20 mA output as a function of a sensor data input. The output circuit (60) further generates a transformer driver output which also serves as a clock for isolated circuitry (106). A sensor circuit (82) generates a transformer driver output representing the sensed parameter. An isolation transformer (76) driven by the driver output excites the sensor circuit (82) and provides a clock reference as a function of the driver output oscillation to the sensor circuit (82) . The isolation transformer (76) is a single coupling device which couples energization, clock reference, sensor data and programming data across an electrically insulating barrier between the output circuit (50) and the sensor circuit (82).
IPC 1-7
IPC 8 full level
G08C 19/02 (2006.01)
CPC (source: EP)
G08C 19/02 (2013.01); H01F 2019/085 (2013.01)
Citation (search report)
- [YD] US 3764880 A 19731009 - ROSE R
- [YD] US 4206397 A 19800603 - DAHLKE CHARLES J [US]
- See references of WO 9113417A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 9113417 A1 19910905; AU 646847 B2 19940310; AU 7349791 A 19910918; CA 2073447 A1 19910822; DE 69127075 D1 19970904; DE 69127075 T2 19980226; EP 0518916 A1 19921223; EP 0518916 A4 19921019; EP 0518916 B1 19970730
DOCDB simple family (application)
US 9101210 W 19910221; AU 7349791 A 19910221; CA 2073447 A 19910221; DE 69127075 T 19910221; EP 91905145 A 19910221