The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 16, 1993
Filed:
Oct. 25, 1991
Toshiro Nigo, Fuji, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A defrosting control method for an air conditioner wherein when the frost amount of an outdoor heat exchanger becomes an allowable value or more during a heating operation, a defrosting operation is performed for defrosting the outdoor heat exchanger. A time period is calculated which is required for a room temperature to reach a preset temperature after the start of the heating operation by an inverter running at one of a predetermined plurality step of frequencies, in accordance with an environmental condition data. A frost amount of the outdoor heat exchanger is calculated in accordance with the environmental condition data, under the condition that the inverter runs for the calculated time period. There is selected an inverter output frequency from the plurality step of frequencies, the inverter output frequency allowing each of the calculated amounts to take the allowable value or less, the allowable value being determined as a level indicating the defrosting operation is unnecessary. The inverter or air conditioner is operated at the selected output frequency.