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AN3095 Datasheet(PDF) 25 Page - STMicroelectronics |
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AN3095 Datasheet(HTML) 25 Page - STMicroelectronics |
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25 / 55 page  AN3095 Schematic description Doc ID 16555 Rev 3 25/55 For example, a cheaper solution may be implemented using a simple voltage divider or a shunt resistor together with an analog opto-isolator to provide galvanic isolation between the power stage and control section. The price to pay in this case is the added complexity of the sensing circuitry. The physical connection to the grid is realized by means of two relays, placed on line and neutral, which are controlled by an I/O of the control board with the STM32F103xx microcontroller, and supplied by the 24 V bus generated by the multi-output power supply. The feedback signals are sent to the control board by means of coaxial shielded cables connected to J14 and J15 on the relays board. |
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