How to check Power factor using oscilloscope | low power factor of ordinary charging devices
In this video, I dismantle a locally built electric vehicle (EV) charger and analyze its power factor using an oscilloscope. To my surprise, the charger draws current from the AC mains only at the voltage peaks, resulting in a significantly low power factor. I observed a phase difference of 60 to 70 degrees between the current and voltage waveforms. This low power factor is even worse than other local-made charging devices and electrical appliances that lack a Power Factor Correction (PFC) section.
The lack of PFC in this EV charger not only reduces the power factor but also injects noise and harmonics into the AC mains, leading to increased Total Harmonic Distortion (THD). Join me as I dive into the details of my findings and discuss the broader implications of using low power factor appliances.
Disadvantages of Low Power Factor Appliances Connected to AC Mains:
1.Increased Energy Losses:
Appliances with low power factors draw more current for the same amount of useful power, leading to higher losses in the distribution system.
2. Reduced Efficiency:
The overall efficiency of the electrical system decreases, causing higher electricity bills.
3. Voltage Drops:
Excessive current draw can cause significant voltage drops in the electrical supply system, affecting other connected devices.
4. Overloading:
The increased current can overload cables, transformers, and other infrastructure, potentially leading to overheating and failures.
5. Harmonic Distortion:
Low power factor devices inject harmonics into the AC mains, which can interfere with other equipment and reduce the lifespan of electrical components.
6. Poor Power Quality:
A low power factor contributes to poor power quality, affecting the reliability and performance of the electrical grid.
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