Dryer control circuit

Details Dryer control circuit Dryer control circuit

1999-06-01

2000-05-16

Walberg, Teresa

Electric heating

Heating devices

With power supply and voltage or current regulation or...

34 53, H05B 102, E26B 1724

Patent

active

06064043&

ABSTRACT:
A dryer timing control circuit includes a heater rated to operate at 240 volts and having one side connected to power. A thermostatic switch is connected between power and the other side of the heater. The thermostatic switch closes in response to a lower temperature in the dryer and opens in response to a higher temperature in the dryer. A timer motor rated to operate at approximately 240 volts has a first input connected to power. A timer motor switch operable by the timer motor has a first switch state connecting the timer motor to the heater without an intervening voltage dropping resistor. The timer motor operates in response to the timer motor switch being in the first state and the thermostatic switch being open, thereby applying 240 volts across the timer motor. The timer motor operation is terminated in response to the timer motor switch being in the first state and the thermostatic switch being in the closed state. In a second state, the timer motor switch connects the timer motor directly to 240 volts. In another embodiment, the timer motor is rated to operate at both 120 volts and 240 volts The timer motor switch in its first state operates the timer motor at 240 volts as described above, however, in its second state, the timer motor switch connects the timer motor directly to 120 volts.

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