CURRENT DETECTION CIRCUIT

PROBLEM TO BE SOLVED: To provide a current detection circuit capable of changing a voltage across a current detection resistance to a predetermined level while holding the voltage difference and accurately detecting the voltage difference across the current detection resistance.SOLUTION: On the basis of a timing control circuit 7, a changeover switch unit 6 connects one end of a first resistance 2 to one end of a current detection resistance 10, and connects one end of a second resistance 3 to the other end of the current detection resistance 10 in a first period T1. The changeover switch unit 6 connects one end of the second resistance 3 to one end of the current detection resistance 10, and connects one end of the first resistance 2 to the other end of the current detection resistance 10 in a second period T2 not overlapping the first period T1. A calculation part 8 calculates a voltage value applied to the current detection resistance 10 by subtracting a difference in voltages (first voltage difference VC1) between the other end of the first resistance 2 and the other end of the second resistance 3 in the first period T1 from a difference in voltages (second voltage difference VC2) between the other end of the first resistance 2 and the other end of the second resistance 3 in the second period T2.