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:
Apr. 27, 2021
Filed:
Nov. 26, 2014
Johnson Controls-hitachi Air Conditioning Technology (Hong Kong) Limited, Hong Kong, CN;
Natsuko Suzuki, Tokyo, JP;
Koji Naito, Tokyo, JP;
Kenji Matsumura, Tokyo, JP;
Kazumoto Urata, Tokyo, JP;
HITACHI-JOHNSON CONTROLS AIR CONDITIONING, INC., Tokyo, JP;
Abstract
An air conditionerincludes: an outdoor heat exchanger; an outdoor fanfor blowing air to the outdoor heat exchanger; an outdoor fan motorthat drives the outdoor fan; an outdoor fan inverterthat drives the outdoor fan motor; and a control unitthat generates a rotation-speed command voltage for controlling the rotation number of the outdoor fan motor. In addition, the control unit starts a defrost operation of the outdoor heat exchanger, based on the rotation-speed command voltage. In this manner, it is possible to achieve an outdoor device of an air conditioner in which there is no need to provide a current detecting sensor, and it is possible to detect frost formation over the heat exchanger during a heating operation and to perform a defrost operation at low costs.