Abstract: A control apparatus is used for a power-supply apparatus with power-supply systems connected in parallel between a pair of power wires connected to a load. Each power-supply system has a series circuit of a battery and a contact of a relay. When the control apparatus determines that at least one relay suffers from a contact welding, the control apparatus performs a battery charge/discharge process to charge/discharge the batteries through the pair of power wires by turning ON one of possible relays while turning OFF the others of the possible relays. The possible relay is defined as having a possibility of suffering from the contact welding. After the battery charge/discharge process, the control apparatus identifies which possible relay actually suffers from the contact welding based on a change in a state of the battery connected in series with the contact of each possible relay.

Abstract: An electronic device includes a multilayer substrate including a plurality of layers of conductors. The multilayer substrate has a first region and a second region divided in a planar direction of the multilayer substrate. The first region is provided with a main circuit that realizes a predetermined function. The second region is provided to have an additional circuit for adding a function to the predetermined function therein. The first region includes a first wiring for electrically connecting the main circuit to the additional circuit and a connecting portion disposed at an end of the first region adjacent to the second region and extending in the multilayer substrate to correspond to all of the conductors layered to electrically connect the first wiring to any of the conductors. The main circuit is connectable with the additional circuit through the first wiring and the connecting portion.

Abstract: A control apparatus is used for a power-supply apparatus with power-supply systems connected in parallel between a pair of power wires connected to a load. Each power-supply system has a series circuit of a battery and a contact of a relay. When the control apparatus determines that at least one relay suffers from a contact welding, the control apparatus performs a battery charge/discharge process to charge/discharge the batteries through the pair of power wires by turning ON one of possible relays while turning OFF the others of the possible relays. The possible relay is defined as having a possibility of suffering from the contact welding. After the battery charge/discharge process, the control apparatus identifies which possible relay actually suffers from the contact welding based on a change in a state of the battery connected in series with the contact of each possible relay.

Abstract: The vehicle-use electronic control device includes a main microcomputer and a sub microcomputer. The sub-microcomputer is configured to be in one of a normal operation mode, a sleep mode and a stop mode, and to learn a frequent use time period in which frequency of use of the vehicle is high. The sub-microcomputer continues to be in the sleep mode if the frequent use time period prevails, and changes from the sleep mode to the stop mode if the frequent use time period does not prevail in order to further reduce the dark current.

Abstract: The vehicle-use electronic control device includes a main microcomputer and a sub microcomputer. The sub-microcomputer is configured to be in one of a normal operation mode, a sleep mode and a stop mode, and to learn a frequent use time period in which frequency of use of the vehicle is high. The sub-microcomputer continues to be in the sleep mode if the frequent use time period prevails, and changes from the sleep mode to the stop mode if the frequent use time period does not prevail in order to further reduce the dark current.