Patent ID: 7751992

Claim:
A system of controlling and triggering a TRIAC (TR), the TRIAC comprising a gate (G), the TRIAC (TR) being connected to a load, the gate (G) being electrically connected to a power unit that actuates the TRIAC (TR) for selectively applying a network voltage (V AC ) to the load and enabling the circulation of an electric current (i c ) in the load, the system comprising: a voltage detection unit for detecting gate voltage; a detection unit for detecting passage of the feed network voltage by zero; a power unit; and a control unit; the voltage detection unit being electrically connected to the control unit, the control unit establishing an adjustable gate (G) voltage limit value (+limit, −limit), and generating a pulse at the gate (G) of the TRIAC (TR) to keep it in conduction, the pulse at the gate (G) being generated from a comparison between the voltage limit value (+limit, −limit) established by the control unit and a voltage measured at the gate (G) from the gate voltage detection unit, the detection unit for detecting voltage at the gate (G) comprising a comparator (CP 1 ) electrically connected to the gate (G) of the TRIAC (TR) and to a digital-to-analog (D/A) converter, the comparator (CP 1 ) receiving the signal of the voltage at the gate (G) of the TRIAC (TR) and a signal generated by the D/A converter, the D/A converter receiving a digital signal generated by a control central, the signal generated by the control central establishing an adjustment voltage value, the adjustment voltage value being equal to the limit values (+limit, −limit), the power unit being associated to the control unit and generating a voltage pulse at the gate of the TRIAC (TR) upon a command from the control central, wherein the voltage of the gate (G) of the TRIAC (TR) is applied to the comparator (CP) by means of a resistive divider (R 1 , R 2 ), and wherein the resistive divider (R 1 , R 2 ) is formed by resistors of the same value.