CONTACTLESS CONTACTOR HAVING PROTECTIVE CIRCUIT

摘要

PURPOSE: A contactless contactor having a protective circuit is provided to prevent a bad effect which is continuously extended due to a loose contact. CONSTITUTION: An automatic input polarity selecting circuit(30) automatically adjusts a polarity of an input operation signal voltage. An input/output divider(40) includes a photo coupler. An amplifying circuit(50) amplifies an output signal of the input/output divider(40). A gate drive circuit(60) receives an output of the amplifying circuit(50) and performs gating of an IGBT. An IGBT circuit(70) includes a cooling fan. A load short detecting circuit(110) detects a short status of a load. A trip determining circuit(130) compares an output voltage of the load short detecting circuit(110) with a reference voltage and determines a trip status of the gate drive circuit(60). An error display circuit(140) displays a trip status of a contactless contactor according to a trip output of the trip determining circuit(130).