| 摘要 |
Disclosed is an overcurrent detection device for detecting an overcurrent in a load circuit which is arranged to control the driving and the stopping of a load 1 by a semiconductor switch (FET 1 ) provided between a battery VB and the load 1 . An added voltage (V 1 -V 3 ) is generated which is obtained by adding a voltage (V 1 -V 2 ) generated across the both ends of the semiconductor switch (FET 1 ) to a voltage (V 3 -V 2 ) which is generated at the time of current change due to the inductance Lp of a copper foil wiring pattern 3 for coupling the semiconductor switch (FET 1 ) and the load 1 . A comparator CMP 1 for comparing the added voltage with an overcurrent determination voltage (V 1 -V 4 ) set in advance is provided. When the comparator CMP 1 detects that the added voltage exceeds the overcurrent determination voltage, it is determined that an overcurrent is generated.
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