| 摘要 |
The invention relates to a voltage shunt regulator (1000) for the protection of an electrical load (LD) from overvoltages and voltage transients of a supply voltage. The electrical load (LD) is connectable to a supply voltage source (Vin) by means of an electrical line which includes a first (LI) and a second (L2) conductive line. The shunt regulator comprises a power circuit block (200) connectable between the first (LI) and the second (L2) conductive lines in parallel to the load (LD). The power block can be activated to limit the voltage applied to the load to a safe voltage (VLD) in case of overvoltages and voltage transients, and comprises a switch circuit (SW1) with trigger threshold connected in series to a voltage limiting circuit (VL). The regulator also comprises a circuit block (100) for detecting the supply voltage and driving the power circuit block (200), connectable between the supply voltage source (Vin) and the power circuit block (200). Such a supply voltage detection and driving circuit block (100) is configured to activate the power circuit block (200) upon the detection of a crossing of a preset voltage threshold (VT) by the supply voltage, from a first voltage level (V ) having an absolute value lower than the absolute value of the threshold (VT) to a second voltage level (V ' ) having an absolute value greater than the absolute value of the threshold (VT). |
