Figure 18. SOVP Rx protection settings
5.9.2 Hard overvoltage protection (HOVP)
HOVP is the fastest (hardware) over-voltage protection, which prevents the rectifier voltage from rising above a
safe level. The default threshold value is 18 V. Triggering the protection causes STWLC38 to short AC1 and AC2
to ground, effectively shorting the receiving coil. This protection should be used as the last measure, as shorting
the receiving coil will cause a significant rise in the transmitter current. Therefore, the HOVP threshold should be
set higher than any other STWLC38 over-voltage protection (but still lower than AMR listed in the datasheet).
HOVP release value depends on SOVP setting.
• If SOVP is enabled, HOVP is released at SOVP threshold
• If SOVP is disabled, HOVP is released at 12 V + SOVP margin (refer to SOVP)
Figure 19. HOVP Rx protection threshold setting
UM3154
Protections overview
UM3154 - Rev 2
page 19/81
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