Original WCS2720 Hall Effect based Linear Current Sensor (0-20A)

Overview

The WCS2720 is a Hall-effect based linear current sensor designed to measure DC (and low-frequency AC) current without direct electrical contact.

• Measurement range: 0 to 20A (typically bidirectional 20A in some configurations)

• Output: Analog voltage proportional to current

• Type: Non-invasive (magnetic sensing)

It provides electrical isolation between measured circuit and output signal.

Working Principle

The sensor operates based on the Hall effect:

1. Current Flow

• Current passes through an internal conductor path inside the sensor

2. Magnetic Field Generation

• Flowing current generates a magnetic field around the con

  • Internal Hall sensor detects this magnetic field

  • Produces a Hall voltage proportional to current

   

  4. Signal Conditioning

  • Built-in amplifier converts Hall voltage linear analog output

  Output voltage directly corresponds to measured current.

  Measurement Characteristics

  Current Range

  • 0 to 20A (unidirectional)

  • Some versions support:

    • 20A (bidirectional measurement)

     

   

  Sensitivity

  • Typically ~100 mV/A (approximate, model-dependent)

  Linearity

  • Highly linear output across range

  Electrical Characteristics

  • Supply voltage: 5V (typical)

  • Output voltage:

    • Centered or bidirectional type)

     

  • Low internal resistance (minimal power loss)

   

  Output Interface

  Analog Output

  • Voltage proportional to current

  Example behavior:

  • 0A ~2.5V (bidirectional type)

  • Positive current voltage increases

  • Negative current voltage decreases

   

  Requires ADC for digital processing.

  Internal Features

  Electrical Isolation

  • No direct electrical connection between:

    • Measured current path

    • Output signal

     

  Low Power Loss

  • Very low conductor resistance

  • Minimal heat generation

   

  Fast Response

  • Suitable for real-time monitoring

  Compact Integrated Design

  • sor

  • Amplifier

   

Operating Behavior

Real-Time Current Measurement

• Continuous analog output

Bidirectional Detection (if supported)

• Detects:

  • Charging current

  • Discharging current

   

Temperature Influence

• Slight drift with temperature

• Internal compensation reduces error

Environmental Characteristics

• Works across typical operating temperatures

• Stable under normal electrical conditions

Limitations

• Accuracy affected by:

  • Temperature drift

  • External magnetic fields

   

• Lower precision compared to:

  • Shunt-based sensors (for very small currents)

   

• Requires calibrTypical Pin Configuration

  • VCC 5V supply

  • GND Ground

  • OUT Analog voltage output

  • IP+ / IP Current input terminals

   

  Functional Role

  The module acts as a:

  • Current sensor (non-contact type)

  • Analog current measurement device

  • Isolation-based sensing element

   

  Summary

  The WCS2720 Hall Effect Current Sensor is a reliable and isolated current measurement solution that:

  • Uses Hall-effect magnetic sensing

  • Measures up to 20A current

  • Provides linear analog voltage output

  • Offers electrical isolation and low power l real-time current monitoring in DC systems