Patent ID: 7471178

Claim:
A current detection device including a choke coil ( 1 ) for smoothing an input current or an output current and a magnetic sensor ( 1 a ) built into the choke coil to detect the input current or output current, wherein the choke coil ( 1 ) is composed of: a pair of cores ( 5 ) provided with an outer magnetic leg ( 5 a ) constituting a closed magnetic circuit and a center magnetic leg ( 5 b ) for forming a gap; a coreless coil ( 6 ) having a space ( 6 b ) at the intermediate portion; and a pair of frames ( 7 ) having a first concave portion ( 7 c ) for housing the center magnetic leg ( 5 b ), a second concave portion ( 7 a ) for housing the magnetic sensor ( 1 a ) and a third concave portion ( 7 b ) for housing the coreless coil ( 6 ).