Patent ID: 8983304
Filing Date: 2015-03-17
Classification: H04B

Abstract:
1. An opto-isolator for electrical isolation of an electrical input signal from an electrical output signal, the opto-isolator comprising: an optical emitter configured to generate emitted light for at least a plurality of fixed predetermined on-periods in response to the electrical input signal; an optical receiver arranged proximate to the optical emitter to receive a first portion of the emitted light and configured to generate the electrical output signal in response to the emitted light; a counter configured to count incrementally number of substantial use that takes place over a predetermined extended use period of the optical emitter; a compensation circuit configured to send a compensation signal to at least one of the optical emitter and the optical receiver when the counter exceeds a predetermined count value; and a switch capacitor circuit having a capacitor that is configured to be accumulatively charged in response to a pulse signal being on for the fixed predetermined on-period when the optical emitter is configured to generate emitted light, and a switch that resets the capacitor after the charge stored in the capacitor exceeds a predetermined value; wherein the predetermined extended use period is substantially longer than the plurality of fixed predetermined on-periods.