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. 07, 1987
Filed:
May. 22, 1985
Kenji Umezu, Shizuoka, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A frequency converting device is provided with a converter for converting ac input power into dc power. The device includes an inverter for inverting an output (dc power) of the converter into an ac output power, and adjustment device for adjusting an output waveform of the inverter in accordance with the voltage values of the ac input power. The adjustment device comprises a memory which stores adjustment data corresponding to the voltage value of the ac input power source connected to the converter, and a selector for selecting a certain adjustment data from the memory in accordance with the voltage value of the ac input power to which the device is connected. Thus, even when the voltage of the ac input power is changed, the effective output of the inverter can be kept substantially constant by adjusting on/off times of the switching elements constituting the inverter to vary a duty factor of the inverter output.