Diode Reverse Voltage Breakdown

Status
Not open for further replies.

myatham

Member level 3
Joined
Sep 7, 2009
Messages
58
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Location
India
Visit site
Activity points
1,746
Hello All,
We are monitoring an AC voltage (200Vac) using a diode and resistor and photo LED of Opto-coupler in series. Here the Reverse break down voltage of diode is 700V, Resistor value is 200K ohm, Opto-coupler reverse break down voltage is 6V.

How to analyze impact of negative voltage (i.e. reverse break down voltage)? Where the reverser voltage will be dropped in this path? How to analyse this circuitry?
 

Diode leakage current and unspecified permitted LED reverse current suggests to modify the circuit rather than "analyze" it. Place an reversed diode in parallel to the LED and everything is fine.
 

Status
Not open for further replies.
Cookies are required to use this site. You must accept them to continue using the site. Learn more…