Developments#

Works done so far for the charging with resonant converter#

Discrete-time description#

We might consider a lower sampling frequency. At that point we should consider a discrete-analysis of the system.

Prototype changes needed#

In our last meeting, we discussed about a low voltage prototype (48 V - max. 500 W) and two resonant tanks:

1) High Q tank, with Lr = 68 uH and 1:1.5 transformer with Lm = 245 uH.

2) Low Q tank, with Lr = 10 uH and 1:1 transformer with Lm = 33 uH.

Transformer#

[Ta et al., 2020]: the magnetizing inductance can be kept low, so that it can be integrated in the transformer. This allows higher power density.

Sensing circuit#

Resonant Tank#

[De Simone et al., 2008] guidelines for the construction of a transformer for a LLC converter which includes all inductors inside it IEEE link [\(f_r=\SI{120}{kHz}\), \(L_r=\SI{56}{\mu H}\), \(L_p=\si{305}{\mu +H}\)]

Power stage#

Missing proper power diodes

missing good points for sensing (rn totem of probes in order to sense voltages)

Rectifier#

Rectifier Sensing#

ADC used by Carlos: AD7822

Remember to look at the number of bits available con the card in addition to the control one.

  • 8-bit

  • 1-4-8 single ended input

  • Supply \(\SI{3}{V}\) or \(\SI{5}{V}\)

  • input range
    \(\SI{0}{V}\) to \(\SI{2}{V_{pp}}\) with \(V_{DD}=\SI{3}{V}\)
    \(\SI{0}{V}\) to \(\SI{2.5}{V_{pp}}\) with \(V_{DD}=\SI{5}{V}\)

  • \(\SI{420}{ns}\) of conversion time - 2 MSPS (500 ns)