Abstract:
A method for generating a fault signal in a system voltage (Aplus) regulator by a phase signal (PH) is disclosed, which comprises the steps of:
detecting the system voltage (Aplus) and phase signal (PH); comparing the system voltage (Aplus) and phase signal (PH) with respective fault levels (REG, Sfault); and generating a fault signal (Fault) upon either the system voltage (Aplus) or the phase signal (PH) falling below the respective fault level of the fault levels (REG, Sfault).
Advantageously in this invention, the fault signal generating method further comprises a step of inhibiting the step of generating a fault signal (Fault) by means of a drive signal (DF) of the system voltage regulator. A diagnostic circuitry (10) for a system voltage regulator (1), implementing the inventive method, is also disclosed.
Abstract:
The invention relates to a circuit generating a voltage signal which is independent of temperature and little sensitive to process variables, comprising at least an output MOS transistor (TM OUT ) wherethrough an output current (I OUT ) flows, it being connected to a first voltage reference (GND) and having a gate terminal (G OUT ) connected to a bias network (11), in its turn connected between a second voltage reference (Vcc) and the first voltage reference (GND). The circuit of this invention includes a bias network (11) comprising at least first (TM1) and second (TM2) MOS transistors connected in a diode configuration, connected in series with each other between said first (GND) and second (Vcc) voltage references, and connected to the second voltage reference (Vcc) through a current generator element (12) having a thermal gradient equal to the thermal gradient of a MOS transistor.
Abstract:
The invention relates to a loop-type voltage regulating device (10), particularly for regulating a voltage of an automotive electric system, being of a type which includes at least one thermal engine (15), a voltage regulator (13) and an alternator (11) operative to deliver a system regulated-voltage signal (A+) to and receive a regulation signal (DF) from the voltage regulator (13). Advantageously, according to the invention, the voltage regulating device further includes a control unit (14) within the regulating loop, which unit is connected between the thermal engine (15) and the voltage regulator (13) and is adapted to supply the latter with a signal related to the engine operation.