| 摘要 |
A current sensor (10) for detecting AC current through a load impedance (14) of an electrical circuit. Sensor components are fabricated within a multilayer board (fig. 3). The sensor includes a transformer circuit including a primary coil (32) coupled in series with the current path (16, 18) of the electrical circuit. The primary coil (32) includes current path elements (20A, 20B) in the form of conductive strips. The transformer secondary (30) comprises first and second electrically conductive coils (30a, 30b) inductively coupled to the current path. The secondary coils are electrically connected in series with one another, so that voltages generated across the coils in response to current in the current path are additive, while interference voltages which are induced in the coils by the presence of external magnetic fields or cross talk between adjacent sensors on the same board are cancelled.
|
