SBASAY6 December 2024 AMC0236
PRODUCTION DATA
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Figure 8-1 illustrates a simplified schematic of a circuit that senses the line voltages of a three-phase AC system. All three voltages are measured against neutral. This allows the three AMC0x36 devices to share a common isolated power supply on the input side.
The AC line voltage on phase L1 is divided down to a ±1V level across the bottom resistor (RSNS) of a high-impedance resistive divider. The voltage across RSNS is sensed by the AMC0x36 (Device 1). On the opposite side of the isolation barrier Device 1 outputs a serial bitstream that represents the L1-to-neutral voltage. In the same way Device 2 and Device 3 sense the L2 and L3 line voltages, respectively. A common AVDD supply is generated from the low-voltage side by an isolated DC/DC converter circuit. A low-cost solution is based on the push-pull driver SN6501 and a transformer that supports the desired isolation voltage ratings.