|発明の名称||POWER FACTOR MEASUREMENT DEVICE|
PROBLEM TO BE SOLVED: To provide a power factor measurement device which is small in size and which is capable of measuring a power factor with one element.
SOLUTION: A power factor measurement device includes: a pair of connection ends (12) for connecting in parallel to a load with respect to a power source; two magnetic elements (21, 22) in which electric resistance change varies according to the identical external magnetic field; a pair of measuring terminals (13) which outputs differential voltage of the two magnetic elements; a power factor sensor part (10) which includes a pair of sensor terminals (10t) connected to the pair of connection ends (12); a voltage detection part (15) which measures the voltage between the measuring terminals (13); a low-pass filter (16) which is connected to the output of the voltage detection part (15); a high-pass filter (17) which is connected to the output of the voltage detection part (15); a rectifier (18) which is connected to the high-pass filter (17); and division means (19) which divides the output of the low-pass filter (16) by the output of the rectifier (18).
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