Switching circuit for a refrigerator control

Details Switching circuit for a refrigerator control Switching circuit for a refrigerator control

1986-12-22

1988-04-05

Tanner, Harry B.

Refrigeration

Automatic control

Of external fluid or means

236 49, 318345G, F25D 1704

Patent

active

047350571

ABSTRACT:
An AC voltage motor switching circuit for a refrigerator control has a temperature responsive portion connected to provide gate current to an SCR which is connected with a reverse-poled diode to form a parallel combination, which together are in series with the AC motor and a charging capacitor. When the SCR is gated on, the SCR conducts positive half-waves of the voltage source and the diode conducts negative half-waves causing the capacitor to become an AC reactance device and, thus, the motor to be energized. When the SCR is gated off, only the negative half-waves of the AC signal are capable of being transmitted through the diode which fully charges the capacitor and prevents current flow through the windings of the motor to deeenergize the motor.

REFERENCES:
patent: 3221237 (1965-11-01), Kalenian
patent: 3251548 (1966-05-01), Foster
patent: 3384801 (1968-05-01), Rodgers
patent: 3402478 (1968-09-01), Hetrick
patent: 3471938 (1969-10-01), Elders
patent: 3575652 (1971-04-01), Snyder
patent: 3707776 (1973-01-01), Schmidgall
patent: 3765100 (1973-10-01), Heidtmann
patent: 3829010 (1974-08-01), Jones
patent: 3962617 (1976-06-01), Offutt et al.
patent: 4646531 (1987-03-01), Song

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