Summary of 3 PHASE ISOLATED HALL-EFFECT CURRENT SENSE AMPLIFIER WITH +/-600V WORKING VOLTAGE AND +/-46A MEASUREMENT RANGE
This project implements a 3-phase isolated Hall-effect current sense amplifier using the TMCS1101 IC to measure bidirectional DC or AC currents up to ±46 A with 50 mV/A sensitivity, ±600 V working voltage, 3 kVRMS isolation, 80 kHz bandwidth, and low drift. It provides galvanic isolation, integrated shielding for common-mode rejection, and requires 7–12 V supply. PCB is 97 x 72.71 mm and is intended for motor phase and 3-phase power monitoring applications.
Parts used in the 3-Phase isolated Hall-effect current sense amplifier:
- TMCS1101 Hall-effect current sensor IC
- Power supply components for 7V to 12V DC (voltage regulator or supply rails)
- Bypass and decoupling capacitors for supply filtering
- Resistors for output conditioning and pull-ups/downs as required
- PCB with dimensions 97 x 72.71 mm and appropriate copper lead frame
- Connectors for three phase current inputs
- Connectors or headers for sensor outputs
- Galvanic isolation hardware/layout features (isolation spacing on PCB)
- Mechanical mounting hardware for board installation
The project described here is a 3-Phase isolated Hall-effect current sense amplifier with +/-600-V working voltage range. The current sensor senses magnetic flux generated from current passing through the lead frame at common-mode voltages 0 to 600V DC and provides proportional output voltage.
The circuit is based on TMCS1101 IC which is a galvanically isolated Hall-effect current sensor capable of DC or AC current measurement with high accuracy, excellent linearity, temperature stability and has a bandwidth of 80KHz. A low-drift, temperature-compensated signal chain provides < 1.5% full-scale error across the device temperature range. The input current flows through an internal 1.8-mΩ conductor that generates a magnetic field measured by an integrated Hall-effect sensor. This structure eliminates external concentrators and simplifies design. Low conductor resistance minimizes power loss and thermal dissipation. Inherent galvanic insulation provides a 600-V lifetime working voltage and 3-kVRMS basic isolation between the current path and circuitry. Integrated electrical shielding enables excellent common-mode rejection and transient immunity. The output voltage is proportional to the input current with 50mV/A sensitivity. Fixed sensitivity eliminates radiometry errors, and improves supply noise rejection. The current polarity is considered positive when flowing into the positive input pin. The circuit is capable of sensing bidirectional current with +/-46A measurement range.
FEATURES
- Power Supply 7V to 12V DC
- Current sensor Range +/-46Amps (Bidirectional) AC Or DC
- Bidirectional Current Sensing
- Output 50mV/A (Normally 2.5V/0Amp)
- Working Voltage +/-600V
- Zero drift internal reference
- Signal Bandwidth: 80Khz
- PCB Dimensions 97 x 72.71 mm
APPLICATIONS
- Inline Motor Phase Current Sensing
- 3 Phase Motor or Load Current measurement
- 3 Phase DC or AC Power Monitoring
- What IC is the circuit based on?
The circuit is based on the TMCS1101 Hall-effect current sensor IC. - What is the measurement range of the sensor?
The sensor is capable of sensing bidirectional currents up to +/-46 A. - What is the output sensitivity?
The output voltage sensitivity is 50 mV/A. - What supply voltage does the project require?
The power supply requirement is 7 V to 12 V DC. - What is the working voltage and isolation rating?
The device provides a +/-600 V lifetime working voltage and 3 kVRMS basic isolation. - What is the signal bandwidth?
The signal bandwidth is 80 kHz. - Is the sensor suitable for DC and AC measurements?
Yes, the TMCS1101 is capable of DC or AC current measurement. - What is the typical zero output level at 0 A?
The output is normally 2.5 V at 0 A (zero reference internal). - What are typical applications for this project?
Typical applications include inline motor phase current sensing, 3-phase motor or load current measurement, and 3-phase DC or AC power monitoring.
