# A Voltage Calibration Chain for Meters Used in Measurements of EV Inductive Power Charging

## TL;DR

This paper presents a detailed voltage calibration chain for measuring power in electric vehicle inductive charging systems, addressing the challenges of superimposed AC ripple and DC signals.

## Contribution

It introduces a novel calibration method using synchronized circuits and a phantom power approach for accurate EV charging measurements.

## Key findings

- Effective calibration of voltage measurement chain demonstrated.
- Improved accuracy in EV inductive power measurement.
- Method suitable for high-frequency ripple conditions.

## Abstract

The inductive charging of electric vehicles requires specific measurement and calibration systems. In fact, the measurement of power on board involves DC signals, which are superimposed to a significant AC ripple up to or over 150 kHz, depending on the type of charging system. A calibration method that makes use of a phantom power, based on two independent but synchronized circuits, is considered, simulating the charging voltage and current. This paper describes in detail a solution in the realization of the voltage calibration chain, based on the use of a DC voltage calibrator, an injector and a voltage divider.

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Source: https://tomesphere.com/paper/1905.08046