| 摘要 |
PROBLEM TO BE SOLVED: To provide a ground fault detection circuit which enables reduction in current consumption, device size, and cost.SOLUTION: A ground fault detection circuit includes; a first voltage divider circuit comprising a plurality of resistive elements (R2, R1, R1'', R2'') serially connected between a positive side supply line 20 and a negative side supply line 30; a second voltage divider circuit comprising a plurality of resistive elements (R2', R1', R1''', R2''') serially connected between the positive side supply line 20 and the negative side supply line 30; and a differential amplifier M0 which amplifies voltage difference between voltage at a node N1 (first node), which is a connection point of a resistor of the first voltage divider circuit, and voltage at a node N2 (second node) which is a connection point of a resistor of the second voltage divider circuit and at which a voltage division ratio with respect to the positive side supply line and the negative side supply line is same as that of the first node. A node N3 (third node), which is different from the node N1, is grounded. |
