Isolated Voltage Sensors for Monitoring Power Supply

Isolated Voltage Sensors scheme

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.

The optocoupler’s output is a pulse train whose frequency increases with increasing input voltage. To develop a linearizing equation for the circuit, measure its output at two convenient, widely spaced input voltages. Then plug the resulting periods into this second-order polynomial approximation and solve the two simultaneous equations for the two constants, k, and k2 :
V2 is zener voltage of D1.

Parts list :
R1,R2 : 82K (1/2W)
R3 : 1M
R4 : 1K
R5 : 200
R6 :100K
C1 : 3,3uF
C2 : 470pF
L1 : 10uH
D1 : 1N4691 (6V2)
D2 : 1N4148
T1 : BC557B
T2 : BC547B
Optocoupler : 6N135, 6N136, or 6N137

Power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.

Tags: isolated high voltage power supply monitor Isolated Voltage Sensors measure high voltages power supply monitor circuit simple VCO voltage controlled oscillator Voltage power supply monitor

Related Post "Isolated Voltage Sensors for Monitoring Power Supply"

Converter 220V AC to 40kV AC
This device allows up to 40,000 volts
Car Battery Monitor with 3 LED
Car Battery Monitor circuit description: This is
Flashing battery monitor
Here is a simple battery monitor circuit in which

Comments are closed.