Soft starting system for an electrical motor

A starter system for an electric motor supplied by a high-voltage electrical network, the starter system comprising:

• an electronic control circuit;
• an electronic switch to control one phase of the electric motor, the electronic switch being controlled by the electronic control circuit;
• a sensor to deliver an analog signal that is representative of a derivative of a current flowing through the one phase of the electric motor;
• and
• a detection board between the electronic control circuit and the sensor, the detection board including circuitry configured to:
• transform the analog signal into a binary electrical signal that is representative of changes in sign of the analog signal,
• convert the binary electrical signal into a binary optical signal, and
• transmit the binary optical signal to the electronic control circuit to control the electronic switch,
• wherein the binary optical signal is transmitted to the electronic control circuit via optical fiber without implementing a link using a communication protocol.