Patent ID: 7154194
Filing Date: 2006-12-26
Classification: B60R,H02J

Abstract:
1. A power circuit of a vehicular electronic control unit including a microprocessor for driving various electric loads in accordance with operation states of various input sensors and contents of a program memory, the power circuit comprising a constant voltage power circuit, an awakening timer circuit, and first and second power supply circuits each of which is supplied with power from a vehicle battery, wherein: the constant voltage power circuit is supplied with power from the vehicle battery via the first or second power supply circuit; the awakening timer circuit generates an awakening trigger signal upon a lapse of a prescribed time from a stop of power supply to the microprocessor; the first power supply circuit comprises an output contact as a first opening/closing element and a coil for closing the output contact; and the second power supply circuit comprises a second opening/closing element that is provided between the vehicle battery and the constant voltage power circuit and is closed in response to the awakening trigger signal.