| 摘要 |
<p>PURPOSE:To accurately detect large current by a current transformer circuit by providing a common resistor at a current circuit in which an electric current is flowed through the secondary winding of the transformer when measuring the load current of a rectifying circuit employing secondary winding of the transformer having a neutral point with two current transformers and measuring the terminal voltage thereat. CONSTITUTION:The primary winding n4 of a transformer 9 having a neutral point is connected to an AC power supply 8, one n51 of two secondary windings n51, n52 is connected through a rectifier 10 and a smoothing reactor 14 to one terminal of a load 15, and the other terminal of the load 15 is connected to the neutral point of the secondary winding. Then, the other secondary winding n52 is connected through a rectifier 11 to the output side of the rectifier 10 as a load circuit, and in order to measure the current flowing through the circuit, current transformers 12, 13 are connected to the input sides of the rectifiers 10 and 11. A common resistor R22 is connected through forward diodes 16, 17 to the secondary windings n62, n72 of the transformers 12, 13, respectively, to notify the load current IDC from the terminal voltage thereat.</p> |
