Refrigerator ice door delay circuit

Details Refrigerator ice door delay circuit Refrigerator ice door delay circuit

1997-03-27

1999-03-23

Gaffin, Jeffrey

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307112, 307139, 307132EA, 62133, 62344, H01H 3500

Patent

active

058864300

ABSTRACT:
Disclosed is an electronics device for use with a refrigerator/freezer for controlling the dispensing of ice cubes by an ice auger through a door flap when a cradle is pressed. The electronics device comprises a solenoid in operative connection with the door flap, and the solenoid is powerably connectable to a 120 Volt AC line power source. The electronics device also comprises a relay switch controlled by two NPN bipolar transistors in a Darlington configuration which are in parallel connection with a diode and a capacitor. The relay switch is also connected to the power source and connects the power source to the solenoid when the cradle is pressed causing the door flap to open. The power source powers the ice auger to dispense ice cubes through the door flap, and the capacitor causes the transistors to be biased on while the capacitor is charged to a voltage greater than a voltage of the diode. When the cradle is pressed, the capacitor begins to de-charge and when the capacitor de-charges to a voltage less than the voltage of the diode, the relay switch disconnects the power source from the solenoid causing the door flap to close.

REFERENCES:
patent: 4680943 (1987-07-01), Mawby et al.
patent: 4739233 (1988-04-01), Marcade
patent: 4942979 (1990-07-01), Linstromberg et al.
patent: 5671606 (1997-09-01), Schroeder et al.

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