| 摘要 |
PROBLEM TO BE SOLVED: To easily and appropriately detect an overcurrent flowing to a plurality of loads to which mutually different power voltages are supplied, without awareness of the state of the loads.SOLUTION: An overcurrent detection circuit 30 comprises: a plurality of switch elements 31a and 31b that are provided correspondingly to each of a plurality of loads 181 and 182 to which mutually different power voltages VS1 and VS2 are supplied, and are put into an ON-state due to the overcurrent flowing to the corresponding load; a constant voltage generation circuit 33 to which a power voltage to be supplied to the load corresponding to a switch element in the ON-state via the switch element therein is applied, and which uses the applied power voltage to generate a detection voltage VS of a constant level; and a resistance division voltage circuit 32 that is a circuit dividing the generated detection voltage VS and outputting the sub-divided detection voltage VS to an output terminal, and is configured such that the mutually different voltage appears in the output terminal in accordance with a combination of the switch elements putting into the ON-state.SELECTED DRAWING: Figure 3 |
