| 摘要 |
PROBLEM TO BE SOLVED: To provide a double-wired load controller having an electronic circuit capable of higher output at the secondary side and smaller heat generation at the primary side of a current transformer while reducing the size of the current transformer.SOLUTION: The double-wired load controller includes: a series circuit of a switch element connected across two input terminals and a current transformer 13; and an ON-power source 17 which is connected to a secondary winding of a current transformer 13 to output a DC power when the switch element 12 is in the conduction state by using an AC current flowing on the secondary winding. The winding ratio n1/n2 between a primary winding 13a and a secondary winding 13b is set so that an impedance Z2 at the secondary side of a current transformer 13 which is converted based on a winding ratio n1/n2 between the primary winding 13a and the secondary winding 13b of the current transformer 13 is almost equal to an impedance Z1 at the primary side of the current transformer 13 (Z2≒Z1×(n1/n2)). Therefore, the impedance matching is ensured, and the power is efficiently transferred to the secondary side of the current transformer. |
