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UCC28700: Fuse tripping while using oscilloscope for primary side measurements and analysis

Mikha Waghmare
Intellectual 410 points
Part Number: UCC28700

Hi,

I have just designed a Flyback Power Supply using the UCC28700. The connector(power receptacle) for the AC mains contains just two terminals line and neutral no earth. The problem is whenever I connect my oscilloscope reference to the ground on the primary side the fuse for my office is tripped.

The input to the circuit is 230V 50Hz. I am using single ended 10:1 passive probes rated for 300V RMS for my measurements. Please let me know the best technique to observe the primary side waveforms for the circuit.

Thank you in advance.