Comparison of bottom noise and high frequency signal

With the rapid popularization of silicon carbide (SiC) and gallium nitride (GaN) power devices, the switching frequency of power electronic systems has exceeded 10MHz (some on-board OBC modules are above 20MHz), this puts forward almost strict requirements on the dynamic range and noise suppression capability of the current probe-the bandwidth limitation (generally ≤ 50MHz) and common mode noise interference (typical value> 80dBμV) of the traditional magnetic ring probe can no longer meet the requirements of accurate measurement under high frequency conditions.

ETA Solutions

In response to these challenges, ETA Technology has launched two new products:

1.ETA5301X split current probe: supports 100A peak current and 5MHz bandwidth to meet the transient current capture of high-power motor controllers

2. ETA56XXX high frequency current probe series: the bandwidth is extended to 20MHz, and the maximum current can reach 500A effective current.

The bottom noise of the probe is a measure of the ability to measure small currents. Let's take a look at the comparison between the two:

By comparison, it can be found that the ETA56XXX series not only measures a larger current, but also has a smaller bottom noise, and it is no problem to measure a small current.

The ability to measure high-frequency signals directly determines the accuracy of fast transient signal capture:

The ETA56XXX series has better reduction degree in measuring 5M high frequency signal, and the high frequency response bandwidth and noise suppression ability are stronger.