| 摘要 |
PURPOSE: A current sensor is provided to reduce semiconductor loss at the high current and to reduce size and costs of a power transistor and a filter component. CONSTITUTION: Measurement current passes through a primary coil(3). The primary coil creates a magnetic field. Compensation current passes through a secondary coil(7) and creates a magnetic field for magnetic field compensation of the primary coil. A magnetic core(2) is magnetically connected to a two wires and concentrates a resultant magnetic field in an air layer(5). A terminating resistor(8) is serially connected to the secondary coil. A sensor unit(4) is placed on the air layer and is exposed to the resultant magnetic field of the primary coil and the secondary coil. A booster]circuit(6) is connected to the lower class of the sensor unit which supplies the compensation current to the secondary coil through the terminating resistor.
|
