Measurement signal coupling device with electrical isolation and electrical equipment unit comprising one such device

A coupling device with electrical isolation comprising:

• at least one input of an input signal (SI),
• an output of an output signal (SO) representative of said input signal, and
• signal transfer means with electrical isolation receiving the input signal and supplying said output signal,
• at least one signal transformer (14) having at least one primary winding (15, 15A, 15B, 151, 152, 153, 154) to receive a primary signal (SP, SP1, SP2, SP3, SP4) representative of said input signal (SI, SIA, SIB, SI1, SI2, SI3, SI4),
• switching means (16, 16A, 16B, 161, 162, 163, 164, 31, 32) to switch the input signal and supply said primary signal representative of said input signal to said primary winding,
• control means (17, 17A, 17B, 27, 27A, 27B, 271, 272, 273, 274) of the switching means comprising a control signal input (SC) receiving control signals during switching periods (TC), and an output electrically isolated from the control signal input and connected to said switching means (16, 16A, 16B, 161, 162, 163, 164, 31, 32) to command primary signal switching during said switching periods (TC),
• characterized in that said control means of the switching means comprise coupling means by electromagnetic induction and/or by capacitive connection.