DEVICE FOR SUPPLYING POWER TO AN ELECTRONIC COMPUTER IN A MOTOR VEHICLE

摘要

A device for supplying power to an electronic computer in a motor vehicle has first and second voltage regulators, operable independently of one another and having parallel inputs and outputs, and in which a desired output voltage is regulated downwards from an input voltage provided by a vehicle network. The first and second regulators each include at least one capacitive storage element at their inputs. A protective device is coupled to the inputs of the first and second regulators for connecting and disconnecting the first and second regulators from the input voltage. A voltage monitoring circuit is coupled to the first and second regulators and the protective device for detecting and evaluating the input voltage and includes at least one output each for individually controlling activation of the first and second regulators and the protective device. The voltage monitoring circuit includes circuit for controlling, as a function of an evaluation result of the input voltage: no activation of the first and second regulators in an input voltage range from zero up to a first limit; activation of the first regulator in the input voltage range exclusively between the first and a second limit; activation of the second regulator in the input voltage range exclusively between a third and a fourth limit, the third limit being below and the fourth limit above the second limit; and activation of the protective device above the fourth limit for disconnecting the first and second regulators from the input voltage to be regulated downwards.