High Voltage, High Current Measurement

A project log for Toyota Camry Hybrid Glow up To Save The World

That's right, the Toyota Camry Hybrid is going to save the world. Don't believe me, follow along as an old 2007 transforms into awesome.

sciencedude1990sciencedude1990 03/17/2024 at 04:530 Comments

Before jumping in and buying the Camry, first I wanted to reproduce the high voltage and high current measurements in the US Department of Energy document.  So, I need to measure ~300 V for the hybrid battery pack, and about 130 Amps for discharge, and -100 Amps for charging.

First, I need a big resistor divider that can withstand that.  A single resistor will break down, so I'm going to try with the snake of 1210 resistors so that no one resistor gets a large voltage.  Testing will be done on my regular AC, because I have a split plug, I can get 240 RMS, or 339.4 V pkpk between the phases...

Here is the isolated ADC test board - ready to be battery powered so completely floating for the high voltages and transients.

For measuring current, I was going to try a TI DRV5053 placed right beside a current carrying conductor, and just measure the tiny field surrounding the cable...