Entonces, por lo que yo he entendido, la burden lo que hace es modificar su tensión según la corriente que circula con ella dependiendo de la que genere la bobina, ya que en Arduino sólo podemos medir una diferencia de tensión, y no de corriente.
No sé si lo he entendido bien...
Con lo que explica para calcular los componentes sí que no pillo ni papa....
- Choose the current range you want to measure
The YHDC SCT-013-000 CT has a current range of 0 to 100A so for this example lets choose 100A as our maximum current.
- Convert maximum RMS current to peak-current by multiplying by sqrt(2).
Primary peak-current = RMS current x sqrt(2) = 100A x 1.414 = 141.4A
3) Divide the peak-current by the number of turns in the CT to give the peak-current in the secondary coil.
The YHDC SCT-013-000 CT has 2000 turns and so the secondary peak current will be:
Secondary peak-current = Primary peak-current / no. of turns = 141.4A / 2000 = 0.0707A
4) To maximise measurement resolution the voltage over the burden resistor at peak-current should be the arduino analog reference voltage (AREF) divided by 2
If your using an arduino running at 5V: AREF / 2 will be 5V / 2 = 2.5V and so the ideal burden resistance will be
Ideal burden resistance = (AREF/2) / Secondary peak-current = 2.5V / 0.0707A = 35.4 Ohms
35 ohm is not a common resistor value we have a choice of 39 ohms or 33 ohms. We recommend going for 33 ohms +- 1%
If you're using an emontx operating off battery AREF will start at 3.3V and slowly decrease as the battery discharges to 2.7V. The ideal burden resistance for the minimum voltage would therefore be:
Ideal burden resistance = (AREF/2) / Secondary peak-current = 1.35V / 0.0707A = 19.1 Ohms
19 ohms is not a common value, we have a choice of 18 ohms or 22 ohms. We recommend going for 18 ohms +- 1%
Y lo de las Rvd tres cuartos de lo mismo.
Por cierto, muchas gracias por la ayuda.
Salu2.
Uraken.