Ratiometric compensated optical isolation coupler

Details Ratiometric compensated optical isolation coupler Ratiometric compensated optical isolation coupler

H - Electricity

04

B

H04B 10/00 (2006.01)

Patent

CA 2276662

An improved opto-isolator circuit is disclosed. A fixed bias current is induced through a photoemitter of the opto-isolator. A fixed DC voltage is fixed across the sensor of the opto-isolator, whereby any unknown scaling factor in the opto-isolator is substantially eliminated. In a low frequency embodiment, a passive bridge is used while in a high frequency embodiment, an active bridge circuit is used.

L'invention concerne un circuit opto-isolateur perfectionné. Un courant de polarisation est induit via le photoémetteur d'un opto-isolateur. On maintient une tension de courant continu fixe au niveau du capteur de l'opto-isolateur, ce qui fait que presque tous les facteurs de proportionnalité inconnus à l'intérieur de l'opto-isolateur sont éliminés. Dans un mode de réalisation à basse fréquence, on utilise un circuit en pont actif.

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