mirror of
https://github.com/uhi22/pyPLC.git
synced 2024-11-10 01:05:42 +00:00
docu: polarity of the modem in the evse readme
This commit is contained in:
parent
117b7d28b0
commit
39fd5b893b
1 changed files with 10 additions and 0 deletions
|
@ -73,3 +73,13 @@ present. This interface name must be configured in the pyPlc.ini, so that pyPLC
|
|||
### Q7: Besides the Python version (pyPLC), is there an embedded solution available?
|
||||
|
||||
Not at the moment. The embedded CCS solutions on ESP32 or STM32 are implementing the PEV (car) side only (https://github.com/uhi22/ccs32, https://github.com/uhi22/ccs32berta, https://github.com/uhi22/ccs32clara)
|
||||
|
||||
### Q8: Which side of the TPlink is the PE and which is the CP?
|
||||
|
||||
The TPlink has a RF transformer with 3 coils. Two coils are connected to the modem chip (the transmit and the receive path), and the
|
||||
third coil is the way to the outside world, in our case the CP and PE. The modulation does not care for the polarity of this path. It uses
|
||||
radio frequencies in the range of 2MHz to 30MHz.
|
||||
This means, it does not matter which side of the "outside coil" is connected to PE and which to CP.
|
||||
The only important thing is, that the coil does not connect directly to the CP and PE, because this would destroy the 12V PWM signal, which
|
||||
lives in parallel on the CP / PE lines. The coupling network of 1nF and 150ohms in series assures, that the RF signals and the 12V PWM
|
||||
are not interfering each other.
|
||||
|
|
Loading…
Reference in a new issue