Safety control system for an electromagnetic door lock of an electric household appliance

摘要

A safety control system for an electromagnetic door lock of an electric household appliance, wherein a blocking pawl is controlled by the movement of a core of an electromagnet, including a supplying circuit of a coil of the electromagnet, power supplying means to supply electric pulses in the circuit for energizing the coil and a PTC element arranged in series in the circuit; wherein power supplying means are of the type adapted to generate first pulses for taking the pawl to a blocking position and second pulses, having a polarity opposite to the first, for taking the pawl to a releasing position; and including means for determining, according to the parameters of an operating cycle of the electric household appliance, the emission of at least one train of first pulses by the power supplying means, so as to produce the heating of the PTC element.

主权项

1. A safety control system for an electromagnetic door lock of an electric household appliance, wherein a blocking pawl is controlled by the movement of a core of an electromagnet, comprising a supplying circuit of a coil of the electromagnet, power supplying means to supply electric pulses in the circuit for energizing the coil and a PTC element arranged in series in the circuit; characterized in that: the power supplying means are of the type adapted to generate first pulses for taking the pawl to a blocking position and second pulses, having a polarity opposite to the first, for taking the pawl to a releasing position; and in combination, in that it further comprises means for determining, according to the parameters of an operating cycle of the electric household appliance, the selective emission of at least one train of first pulses by the power supplying means, so as to produce the heating of the PTC element.