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    • 5. 发明专利
    • Improvements to electronic variators operating by phase control
    • FR2569915A3
    • 1986-03-07
    • FR8413591
    • 1984-08-28
    • BAUDRY JEAN
    • H02M5/257
    • Assembly device making it possible, optionally, to have, when the variator is put into service, at the terminals of the load, a voltage which is substantially equal to that of the network. The load being, in general, constituted by an asynchronous motor with a resistant cage, normally coupled to an air extraction system. The maximum voltage obtained depending on the state of self-heating of a thermistor with a positive temperature coefficient PTC; above the point of flipping of the latter (which is produced in a few seconds), the voltage at the terminals of the load assuming the value displayed by the speed regulation potentiometer. The invention furthermore comprises a self-limitation of the current for a few mS, which time is sufficient for the establishment of the starting contact to be made, whereas the current is still negligible. A relaxation device, which only operates when the protective fuse is cut, acts on the supply of the operating light, making the latter flash.