| 摘要 |
<p>Disclosed is a non-polarized, contactless relay constructed of electronic circuitry devoid of mechanical contacts but capable of performing the same function as a relay with such contacts. The relay includes a transformer (3), a control circuit (1, 2) for applying an oscillatory signal to the primary winding of the transformer (3) in accordance with a command input (IN), a rectifying circuit (4) for rectifying A.C. power obtained from the secondary winding of the transformer (3) in response to the oscillatory signal applied to the primary winding, a smoothing circuit (5) which smooths the rectified output produced by the rectifying circuit (4) for delivering D.C. power, and switching means (6) composed of a pair of MOS-type field-effect transistors (6a, 6b) driven by the D.C. output of the smoothing circuit (5). The command input (IN), namely "1" or "0" logic, applied to the control circuit (1, 2) results in the supply of the D.C. signal to the MOSFETS (6a, 6b) when logical "1" holds, driving the MOSFETS (6a, 6b) into conduction to form a closed path between the output terminals (A, B) of the switching means (6) and, hence, close the relay.</p> |
