2.5.9
ZVS
The ZVS (Zero Voltage Switching) signal is available on J202 (user board) and J203 (
development board) connectors. It is referenced with respect to VDD and GND (refer to
).
The ZVS signal represents the mains voltage with respect to zero crossing. It allows synchronizing AC switch
control with the mains voltage frequency.
As shown on the figure below, if the mains voltage is positive (neutral with respect to line), the ZVS signal is set to
GND. If the mains voltage is negative (neutral with respect to line), the ZVS signal is set to VDD.
Figure 15.
ZVS signal versus mains voltage
ZVS signal (« ZVS »
regarding « GND »)
ZVS signal (« N_ZVS »
regarding « L_ZVS »)
V
MAI NS
signal (« N »
regarding « L »)
Figure 16.
STEVAL-GLA001V1 evaluation board ZVS components
From the primary side, “Line”, “Neutral”, “N_ZVS” and “L_ZVS” test points are available to measure ZVS voltage
level.
Caution:
These test points are referenced to high voltage.
From the secondary side (low voltage and insulated), “ZVS” and “GND” test points are available to measure ZVS
voltage level.
UM2304
Hardware function description
UM2304
-
Rev 3
page 12/46
