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:
Dec. 27, 2016
Filed:
Mar. 18, 2015
Fuji Electric Co., Ltd., Kawasaki, JP;
Qichen Wang, Hino, JP;
Satoru Fujita, Tachikawa, JP;
FUJI ELECTRIC CO., LTD., Kawasaki, JP;
Abstract
When in an operation mode in which an alternating current voltage Vout is output using a positive voltage Vof a direct current power sourceinput via a switching element Q, a negative voltage Vof the direct current power sourceinput via a switching element Q, and a zero voltage Vz input via a bidirectional switch element BSor an alternating current voltage Vs input via a bidirectional switch element BS, in the period in which the polarity of the output voltage Vout and the polarity of an output current Iout are the same, a control signal of an element to be caused to perform an on/off operation is generated by being pulse-width modulated using a carrier signal S with a first frequency, and in the period in which the polarity of the output voltage Vout and the polarity of the output current Iout are different, a control signal of an element to be caused to perform an on/off operation is generated by being pulse-width modulated using a carrier signal with a second frequency lower than the first frequency.