Photocoupler

Details Photocoupler Photocoupler

2008-09-11

2010-12-28

Nguyen, Danny (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

C361S056000

Reexamination Certificate

active

07859810

ABSTRACT:
A photocoupler includes a light emitting device, a drive circuit; a clamp circuit and a light receiving section. For an input voltage to the input terminal being within a range between a first voltage and a second voltage, the photocoupler is allowed to enter an operation mode in which the drive circuit, in response to the digital signal inputted thereto, drives the light emitting device to convert the digital signal to the optical signal, and the electrical signal is externally outputted from the light receiving section. For an input voltage to the input terminal being outside the range between the first voltage and the second voltage, the photocoupler is allowed to enter an inspection mode in which the drive circuit stops driving the light emitting device, the first transistor of the clamp circuit is turned on, and a current generally equal or proportional to a clamp current of the clamp circuit is supplied to the light emitting device so that characteristics of the light emitting device can be measured.

REFERENCES:
patent: 07-086902 (1995-03-01), None
patent: 3367718 (2002-11-01), None
patent: 3367718 (2003-01-01), None
Japanese Office Action for 2007-239546 mailed on Nov. 9, 2009.

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