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:
May. 19, 1987
Filed:
Nov. 12, 1985
Nagataka Seki, Fuchu, JP;
Kouichi Kaneko, Fuchu, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A power converter apparatus for use in supplying power from a DC power source to a load, including a chopper connected to the DC power source; an inverter connected to a DC output of the chopper for supplying converted AC power to the load; an error amplifier for detecting an output voltage of the power converter apparatus and controlling the output voltage so as to maintain the output voltage equal to a predetermined reference value; and a voltage control circuit for generating a gate signal for the chopper, including an oscillator circuit for producing a variable frequency signal having a frequency varied in accordance with an output signal of the error amplifier, and a phase shifter for producing the gate signal with a pulse width varied in synchronism with the output signal of the oscillator circuit and for applying the pulse width varied gate signal to the chopper. In this way the chopper frequency is decreased to improve the operating efficiency during light-load operation.