POWER SOURCE CONTROL DEVICE, AND RELAY MALFUNCTION DETECTING METHOD

摘要

When an ignition key is turned ON, an ECU (50) drives a bidirectional DC/DC converter (40) to charge a condenser (C1) to a voltage (Vth1) (< VB). The ECU (50) turns ON only a first relay (SMR1) to diagnose the deposition of an OFF second relay (SMR2) on the basis of a change in a voltage (VL) at that time. After the diagnosis of the deposition, the ECU (50) turns ON the second relay (SMR2), so that the condenser (C1) is charged to the voltage level of a main condenser device (B).