Zvs; Figure 15. Zvs Signal Versus Mains Voltage; Figure 16. Steval-Gla001V1 Evaluation Board Zvs Components - STMicroelectronics STEVAL-GLA001V1 User Manual

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
selector).
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.
V
ZVS signal (« N_ZVS »
regarding « L_ZVS »)
ZVS signal (« ZVS »
regarding « GND »)
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 - Rev 3
Figure 15.
signal (« N »
MAI NS
regarding « L »)
Figure 16. STEVAL-GLA001V1 evaluation board ZVS components
ZVS signal versus mains voltage
UM2304
Hardware function description
(NUCLEO-F030R8
Section 2.5.3 VDD
page 12/46