From 4a173d057f5cef5e03870a626b6ec593af8b5d38 Mon Sep 17 00:00:00 2001 From: uhi22 Date: Sat, 26 Oct 2024 17:17:06 +0200 Subject: [PATCH] docu: signal amplitude collection --- doc/plcSignalAmplitude.md | 41 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 doc/plcSignalAmplitude.md diff --git a/doc/plcSignalAmplitude.md b/doc/plcSignalAmplitude.md new file mode 100644 index 0000000..d6f67cd --- /dev/null +++ b/doc/plcSignalAmplitude.md @@ -0,0 +1,41 @@ +# PLC signal amplitudes + +To have comparable results, we measure the peak-to-peak voltage of the preamble of the homeplug packet. + +1. Homeplug modem with AR7420, supplied by 5V +10Vpp at the transformer + +2. Homeplug modem with AR7420, supplied by 5V, with 150ohm series resistor between transformer and CP. +Foccci v3 (including transformer with RIK10, 2x5 turns) connected via 1m twisted pair. +3Vpp at the CP line + +3. Like 2, but in the homeplug modem two additional series resistors 680ohms in the transmit path, between +the power amplifier and the transformer. + +- EVSE packet: 250mVpp at the CP line +- Foccci packet: 500mVpp at the CP line + +4. Like 3, but in the homeplug modem the two 680ohm in serial and a 10ohm in parallel to the transformer. + +- Foccci packet: 500mVpp at the CP line (no change, normal) +- EVSE packet: hardly measurable, in the 20mVpp range. +- Communication still works perfect. + +5. Compleo 20kW triple charger + +Sends very loud packets, even if no vehicle is connected. +17Vpp + +6. ISO 15118-3 + +On both, EVSE side and EV side of the charging cable, the typical voltage is +1.3Vpp. +This is specified as "power spectral density" of typical -75dBm/Hz at 1.8MHz to 30MHz, receiver band width 9kHz with 50 ohms. + +Example states the following levels: +- Transceiver output: -72dBm/Hz +- CP on EVSE: -76dBm/Hz +- CP on PEV: -78dBm/Hz +- Transceiver modem input: -81dBm/Hz +This would be 9dB between transmitter output and receiver input. +