Motor starter circuit, particularly for refrigerator compressors

A motor starter circuit, (particularly) for compressors of refrigerators (and the like), comprising a starter device, adapted to be connected to a starter winding an to a steady-state winding of an asynchronous motor, said windings being in turn connected to a power supply line, wherein said starter device comprises a rectifier bridge adapted to supply a switching device, a gate terminal of said switching device being supplied by means of a resistive-capacitive network, a capacitive divider supplied by said bridge, a voltage drawn across said capacitive divider being adapted to supply a transistor which is series-connected to said resistive-capacitive network, said starter winding being supplied until said transistor starts conducting, said switching device being switched off when said transistor switches on, and wherein said capacitive divider comprises a first capacitor which is connected to a diode which is in turn connected to a second capacitor, said second capacitor being connected in parallel to a resistive divider adapted to supply said transistor.

A motor starter circuit for compressors of refrigerators, comprising a starter device, adapted to be connected to a starter winding and to a steady-state winding of an asynchronous motor, said windings being in turn connected to a power supply line, wherein said starter device comprises a rectifier bridge adapted to supply a switching device, a gate terminal of said switching device being supplied by means of a resistive-capacitive network, a capacitive divider supplied by said bridge, a voltage drawn across said capacitive divider being adapted to supply a transistor which is series-connected to said resistive-capacitive network, said starter winding being supplied until said transistor starts conducting, said switching device being switched off when said transistor switches on, and further comprising a capacitor which is connected in parallel to said switching device.

A motor starter circuit for compressors of refrigerators, comprising a starter device, adapted to be connected to a starter winding and to a steady-state winding of an asynchronous motor, said windings being in turn connected to a power supply line, wherein said starter device comprises a rectifier bridge adapted to supply a switching device, a gate terminal of said switching device being supplied by means of a resistive-capacitive network, a capacitive divider supplied by said bridge, a voltage drawn across said capacitive divider being adapted to supply a transistor which is series-connected to said resistive-capacitive network, said starter winding being supplied until said transistor starts conducting, said switching device being switched off when said transistor switches on, and further comprising a steady-state capacitor which is connected in parallel to said steady-state winding.

A motor starter circuit, (particularly) for compressors of refrigerators (and the like), comprising a starter device, adapted to be connected to a starter winding and a steady-state winding of an asynchronous motor, said windings being in turn connected to a power supply line, wherein said starter device comprises a rectifier bridge adapted to supply a switching device, a gate terminal of said switching device being supplied by means of a resistive-capacitive network, a capacitive divider supplied by said bridge, a voltage drawn across said capacitive divider being adapted to supply a transistor which is series-connected to said resistive-capacitive network, said starter winding being supplied until said transistor starts conducting, said switching device being switched off when said transistor switches on, further comprising a temperature compensation resistor which is connected in parallel to said transistor.