| 摘要 |
PROBLEM TO BE SOLVED: To improve failure diagnosis accuracy of a reverse connection protective circuit.SOLUTION: A first switching element 110, a current detector 160 for outputting a diagnosis current depending on a current flowing in an electric path 140 for connecting a battery 200 with a load 300, and a second switching element 120 are arranged on the electric path 140 in this order. The first switching element 110 includes a parasitic diode 112 capable of allowing a current to flow from the load 300 to the battery 200. The second switching element 120 includes a parasitic diode 122 capable of allowing a current to flow from the battery 200 to the load 300. A voltage comparator 170 compares a voltage depending on the diagnosis current with a reference voltage to diagnose whether or not a failure has occurred at the load 300, the first switching element 110, or the second switching element 120.SELECTED DRAWING: Figure 2 |
