Patent ID: 7068485
Filing Date: 2006-06-27
Classification: H02M

Abstract:
1. A multi-output electric power source device comprising: first and second constant voltage generating circuits for changing an input voltage from an external electric power source to predetermined supply voltages to be supplied to a vehicle-mounted electronic control device, wherein the first constant voltage generating circuit comprises a first switching regulator and the second constant voltage generating circuit comprises a second switching regulator, and wherein the first and the second switching regulators regulate the input voltage; an abnormal condition detector circuit for detecting an occurrence of an abnormal condition of either one of the first and second constant voltage generating circuits; and protection means provided for each of the constant voltage generating circuits to interrupt or limit an output of a supply voltage from the constant voltage generating circuit in which the abnormal condition was detected and the other of the first and second constant voltage generating circuits when the abnormal condition is detected, wherein the abnormal condition detector circuit is provided in common for the first and second constant voltage generating circuits to interrupt or limit the output of the supply voltage in both of the constant voltage generating circuits when the abnormal condition is detected by the abnormal condition detector circuit while maintaining the input voltage.