Defrost control apparatus and method

Details Defrost control apparatus and method Defrost control apparatus and method

1983-01-20

1984-10-02

Tanner, Harry B.

Refrigeration

Automatic control

By accumulation on freezing surface, e.g., ice

62 80, 62154, F25D 2102

Patent

active

044740247

ABSTRACT:
Method and apparatus are disclosed wherein a circuit for detecting the phase angle of a motor is disclosed. This circuit utilizes zero crossing detectors to compare the voltage and current signals such that a digital signal indicating the value of the phase angle by the duration of the signal is generated. Additionally, a method and apparatus for comparing the phase angle to the reference phase angle value is disclosed. Means for updating the reference value and for comparing the detected value to the reference value to determine appropriate defrost initiation time are additionally disclosed.

REFERENCES:
patent: 3588710 (1971-06-01), Masters
patent: 3701013 (1972-10-01), Gilmore
patent: 4025848 (1977-05-01), Delagrange et al.
patent: 4104888 (1978-08-01), Reedy et al.
patent: 4123792 (1978-10-01), Gephart et al.
patent: 4246497 (1981-01-01), Lawson et al.

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