Stand-By Consumption - STMicroelectronics STEVAL-IHT008V1 User Manual

UM2027
Figure 4: Inrush current at STEVAL-IHT008V1 startup on 230 V line (500 µF output DC
1.6

Stand-by consumption

One of the main advantages of using the T_ICL Triac in front of the rectifier bridge is that it
allows full bridge disconnection during standby to suppress losses. This can also be
achieved by adding a front-end relay (like S2 in
inrush current and standby
available by simply turning off this Triac.
To give an idea of the benefits of such bridge disconnection, we measured the typical
losses of the STEVAL-IHT008V1 board in standby mode. Three cases are tested:

Case 1: STEVAL-IHT008V1 board (unmodified) with T_ICL in OFF state ("HVDC"
switch in OFF position).

Case 2: as above, but with a PTC (EPCOS B59107J0130A020) plugged in place of
the T_ICL Triac to simulate the losses for a classic solution using only one PTC and
losses"). But, thanks to the T_ICL Triac, this function is already
Figure 5: Solution using relays to limit inrush current and standby losses
DocID029048 Rev 1
capacitor)
Figure 5: "Solution using relays to limit
Evaluation board objectives
7/37