EP 1316148 A1 20030604 - CONTROLLER FOR A CAPACITIVE SENSOR
Title (en)
CONTROLLER FOR A CAPACITIVE SENSOR
Title (de)
STEUERUNGSSEINRICHTUNG FÜR EINEN KAPAZITIVEN SENSOR
Title (fr)
UNITE DE COMMANDE DE CAPTEUR CAPACITIF
Publication
Application
Priority
- GB 0103920 W 20010903
- GB 0021480 A 20000901
Abstract (en)
[origin: GB2366385A] A capacitance detector circuit (40) for use in detecting the proximity of objects and as a collision avoidance device in a vehicle comprises a clock (41), providing a first signal (51) to one plate of a capacitive sensor (42) and an out of phase signal (53, 54) to a synchronised rectifier unit (45-49) comprising switches (45, 46), low pass filters (47, 48) and amplifier (49). The clocked capacitor plate is connected to the input of the rectifier unit which produces an output signal dependent upon the capacitance of the sensor which is dependent upon its proximity to objects. Guard electrodes are included for improving sensor performance. The detector circuit is controlled by a microcontroller or by analogue circuitry to produce drive signals. Output signals can be used to produce audible warning signals of object proximity.
IPC 1-7
IPC 8 full level
G01B 7/02 (2006.01); B60R 19/48 (2006.01)
CPC (source: EP)
G01B 7/023 (2013.01); B60R 19/483 (2013.01)
Citation (search report)
See references of WO 0219524A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
GB 0021480 D0 20001018; GB 2366385 A 20020306; AU 8423001 A 20020313; EP 1316148 A1 20030604; WO 0219524 A1 20020307
DOCDB simple family (application)
GB 0021480 A 20000901; AU 8423001 A 20010903; EP 01963198 A 20010903; GB 0103920 W 20010903