Isolated-Half-Bridge-Driver

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Isolated Half-Bridge Motor Driver

A robust, single half-bridge motor driver featuring galvanic PWM isolation and high-resolution bidirectional current sensing. Designed to safely interface a microcontroller with high-voltage motor rails while providing precise analog current feedback.

Project Status

Hardware: Complete (KiCad schematic and PCB layout finalized).
Firmware: C++ driver code currently in development.

Key Hardware Specifications

Gate Driver: IR2101 with bootstrap topology (1N5819 diode / 1uF cap).
Power Stage: 2x IRFZ44N N-Channel MOSFETs with 1000uF bulk smoothing.
Galvanic Isolation: 2x 6N137 high-speed optocouplers protecting the logic side.
Current Sensing: AD8418 bidirectional amplifier across an R002 milliohm shunt, heavily filtered (10Ω/10nF/1nF).
Reference Voltage: Buffered 1.65V rail generated via MCP6002 for center-biased bidirectional sensing.

Interface & Pinout

Logic Side (Low Voltage)

PWM_H / PWM_L: 2-Channel high-speed logic inputs (isolated via 6N137).
I_SENSE_OUT: Amplified analog voltage representing motor current (centered at 1.65V).
VCC_LOGIC: Input for the onboard LDO stepping down to power the opto-secondaries and IR2101.
GND: Logic ground.

Power Side (High Voltage)

MOTOR_V+: Main high-voltage power rail.
MOTOR_OUT: Half-bridge switching output to the motor.
GND_PWR: Power ground (isolated from logic ground).

Repository Structure

/Hardware - KiCad project files (.kicad_pro, .kicad_sch, .kicad_pcb).
/Docs - PDF schematics, board renders, and full CSV Bill of Materials.
/Firmware - Placeholder for the upcoming C++ hardware abstraction and control classes.

Comments

Isolated Half-Bridge Motor Driver

Project Status

Hardware: Complete (KiCad schematic and PCB layout finalized).

Firmware: C++ driver code currently in development.

Key Hardware Specifications

Gate Driver: IR2101 with bootstrap topology (1N5819 diode / 1uF cap).

Power Stage: 2x IRFZ44N N-Channel MOSFETs with 1000uF bulk smoothing.

Galvanic Isolation: 2x 6N137 high-speed optocouplers protecting the logic side.

Current Sensing: AD8418 bidirectional amplifier across an R002 milliohm shunt, heavily filtered (10Ω/10nF/1nF).

Reference Voltage: Buffered 1.65V rail generated via MCP6002 for center-biased bidirectional sensing.

Interface & Pinout

Logic Side (Low Voltage)

PWM_H / PWM_L: 2-Channel high-speed logic inputs (isolated via 6N137).

I_SENSE_OUT: Amplified analog voltage representing motor current (centered at 1.65V).

VCC_LOGIC: Input for the onboard LDO stepping down to power the opto-secondaries and IR2101.

GND: Logic ground.

Power Side (High Voltage)

MOTOR_V+: Main high-voltage power rail.

MOTOR_OUT: Half-bridge switching output to the motor.

GND_PWR: Power ground (isolated from logic ground).

Repository Structure

/Hardware - KiCad project files (.kicad_pro, .kicad_sch, .kicad_pcb).

/Docs - PDF schematics, board renders, and full CSV Bill of Materials.

/Firmware - Placeholder for the upcoming C++ hardware abstraction and control classes.

Isolated-Half-Bridge-Driver

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Isolated Half-Bridge Motor Driver

Project Status

Key Hardware Specifications

Interface & Pinout

Logic Side (Low Voltage)

Power Side (High Voltage)

Repository Structure

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Isolated Half-Bridge Motor Driver

Project Status

Key Hardware Specifications

Interface & Pinout

Logic Side (Low Voltage)

Power Side (High Voltage)

Repository Structure

Usage Notes