深究各式电源分析与 USB PD 测试应用.pdf

Power Analysis In-Depth and USB-PD Technology 深究各式電源分析與USB-PD 測試應用 Alvin Ding Business Development Manager Agenda ı Power Electronics Measurements and Analysis  Probing Techniques – What’s right, what’s wrong, what’s useful  Signal enhancement methods – Getting the most out of your signal  Real-world power electronics measurements  Ripple Noise / Spectrum  Step Response  Verifying SOA  Measuring conversion efficiency ı USB Power Delivery 2 Probing Techniques Probe Compensation Under-Compensated Signal Properly Compensated Signal Probe Tip Scope BNC input Over-Compensated Signal To maintain probe attenuation ratio over its rated bandwidth 4 Probing Techniques Wrong Contacting the DUT ı Lots of accessory – not everything good for power meas. Right Actual Signal Ringing 5 Differential probes