Phase Angle Measurement Circuit Design
Budget: ₹37,500 – ₹75,000 INR
I need a compact, reliable circuit that can determine the phase angle between two voltage waveforms that may vary anywhere from 1 mV up to 250 V while operating at the standard 50–60 Hz power-line frequency. The target accuracy is 0.1 ° and I will need both an analog representation (for quick scope checks) and a digital output that a microcontroller or DAQ can read.
Key technical points I already foresee:
• Wide-span front-end that conditions millivolt-level signals yet also withstands (and is isolated from) full-mains amplitudes.
• Stable zero-crossing or vector-math approach that still resolves 0.1 ° at 50–60 Hz, so jitter control and low-noise design are critical.
• Dual outputs: a calibrated DC level (0 – 5 V or similar) proportional to phase, plus a digital word or serial stream that reports the same value.
Deliverables I expect:
1. Schematic and PCB layout files (Altium, KiCad or equivalent) with full BOM.
2. Firmware or signal-processing code if a microcontroller/FPGA is used.
3. Simulation or bench-test data demonstrating 0.1 ° accuracy across the 1 mV–250 V span.
4. Brief test procedure so I can replicate your results.
If you have proven experience with precision phase measurement, signal conditioning, isolation techniques and low-frequency analog design, I’d like to hear how you would tackle this and what components or topology you would choose.
Key technical points I already foresee:
• Wide-span front-end that conditions millivolt-level signals yet also withstands (and is isolated from) full-mains amplitudes.
• Stable zero-crossing or vector-math approach that still resolves 0.1 ° at 50–60 Hz, so jitter control and low-noise design are critical.
• Dual outputs: a calibrated DC level (0 – 5 V or similar) proportional to phase, plus a digital word or serial stream that reports the same value.
Deliverables I expect:
1. Schematic and PCB layout files (Altium, KiCad or equivalent) with full BOM.
2. Firmware or signal-processing code if a microcontroller/FPGA is used.
3. Simulation or bench-test data demonstrating 0.1 ° accuracy across the 1 mV–250 V span.
4. Brief test procedure so I can replicate your results.
If you have proven experience with precision phase measurement, signal conditioning, isolation techniques and low-frequency analog design, I’d like to hear how you would tackle this and what components or topology you would choose.