Isolated Voltage Sensors for Monitoring Power Supply

Published:2013/3/18 21:13:00 Author:Ecco | Keyword: Isolated Voltage Sensors, Monitoring Power Supply | From:SeekIC

This is simple VCO ( voltage controlled oscillator) circuit , connected to your current instrumentation by an optoisolator, means that you can measure high voltages of your instrumentation more secure. The component values suit a 0 to 600 V input range (power dissipation in R1 and R2 set a limit on the input-voltage range). The circuit’s linearity is not an issue, because you can linearize its output in software. The input voltage (VI), charges capacitor C1 until zener diode D1 conducts. Then, the zener diode triggers an “avalanche” circuit that discharges C1 into optocoupler Q1. After Cl discharges, the charging cycle repeats. C1 also averages the sensed-voltage level, which thereby provides noise immunity.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Power_Supply_Circuit/Isolated_Voltage_Sensors_for_Monitoring_Power_Supply.html

Print this Page | Comments | Reading(3)