| 摘要 |
The invention relates to a method for protecting an I/O electronic circuit against overvoltages. The I/O circuit of the electronic circuit is provided with a current path (1) comprising a first diode (V1N), through which current path a current (ip) flows when the mains voltage is negative, and with a second current path (2) comprising a second diode (V1P) and a thyristor (T1), the thyristor (T1) being fired by means of a time-delay circuit charged by a positive voltage, and that the current flowing through the current paths (1,2) is used to trigger a protection device. <IMAGE> |
