VEHICLE POWER SUPPLY CONTROL APPARATUS AND VEHICLE POWER SUPPLY APPARATUS

摘要

A vehicle power supply control apparatus and a vehicle power supply apparatus wherein a stable voltage can be outputted during at least an interval from an activation of a vehicle engine to a running state thereof. There are included a charging circuit that converts an electric power of a first voltage level supplied from a main power supply circuit of an internal combustion engine to an electric power of a second voltage level; a capacitor into which the converted electric power of the second voltage level is charged; and a discharging circuit that converts the electric power of the second voltage level charged in the capacitor back to the electric power of the first voltage level and supplies this electric power of the first voltage level to the main power supply circuit when the voltage of the supplied electaric power becomes less than a predetermined value, whereby the voltage of the main power supply circuit of the internal combustion engine can be maintained in a predetermined range.