Current Monitor System (1606)

AJ PikulBarath Parthasarathy

Jason StockMaya Dubrow

Objectives

Develop a current monitor

Phonon’s requirements:

7-50V VSupply , Variable Waveform

DC/PWM Signal Input

High Side/High Common Mode Voltage

Low impedance (< 10 ohms)

Ranging

Software/Calibration

Overview of Circuit

● Power Supply

● Voltage Protection

● Sense Amplification

● Output Circuit

Schematic

Power Supply

Sections:

Rectifier (Filter)

Series Diodes Cap.

Boost Converter

Power Supply: Rectifier (Filter)

28V, 30%, 10kHz PWM signal

Power Supply: Series Diodes

Each diode has a typical voltage of Vz =5V

Power Supply: Boost Converter

Max686

Sense and Amplification

Sections:

Solid State Relay

INA169 Op-Amp (2.7-60V)

Sense and Amplification: Solid State Relay

Four parallel resistors

High Power, low resistance

Sense and Amplification: Operational Amplifier

INA169

Output Circuit

Sections:

Output resistance

Buffer Circuit

Output Circuit: Buffer Circuit

Buffer circuit retains constant gain.

OPA340

DAQData acquisition device

(1408FS)

(Resolution) Q=E/(2^M)

DAQ tracks:

Number of samples (range)

Index sample

SoftwareVBA .NET

Calibration Routine

Data Storing/Display

Benefits of Our Model

1 mA resolution on 10 A range

Large common mode voltage

Low output impedance

Fast given supplied hardware

Very nice software

Wide range of power sources

Final Statements/ Future PlansH-Spice Simulation

Choose Specific Values

Further Test of Regulator/Amp

Prototype Circuit

Extensive Testing

Extensions To Project:

❏ Adjustable anti-aliasing filter

❏ Autoranging

❏ MIMO Extension

❏ Automatic Calibration

Resources

http://www.ti.com/lit/ds/symlink/ina169.pdf

https://datasheets.maximintegrated.com/en/ds/MAX686.pdf