| 摘要 |
PROBLEM TO BE SOLVED: To realize an overcurrent protection circuit by a circuit having a simple structure. SOLUTION: Semiconductor switches 10-15 are driven by a control circuit 70 to supply currents to loads 6a-6f. The currents flowing through the loads 6a-6f are detected by an overcurrent detection circuit 30. Moreover, a predetermined numerical value according to a detected current value acquired this time is added to and subtracted from a calculation result using a predetermined numerical value according to a detected current value acquired last time by an addition and subtraction circuit 40. The control circuit 70 turns off the semiconductor switches 10-15, when a calculation result in the addition and subtraction circuit 40 exceeds a first criterion threshold value. Thereby, wires 8a-8f and the loads 6a-6f are protected from overcurrent. COPYRIGHT: (C)2011,JPO&INPIT
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