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:
Jan. 10, 2017
Filed:
Nov. 02, 2015
Anpec Electronics Corporation, Hsinchu, TW;
Chih-Yuan Chen, Hsinchu, TW;
Tzu-Yang Yen, Taipei, TW;
Anpec Electronics Corporation, Hsinchu, TW;
Abstract
An audible noise avoiding circuit and a DC-DC boost converter for a DC-DC boost converter are provided. The audible noise avoiding circuit comprises a timing controller and a linear regulator. The timing controller discharges a timing capacitor to a low voltage according to switching of the DC-DC boost converter. A sink output stage of the liner regulator is coupled to the output voltage node. When the voltage of the timing capacitor is higher than a threshold voltage, the compensation unit compensates the output of the operational amplifier for gradually turning on the sink output stage in order to gradually reduce the voltage of the output voltage node. A predetermined charging time interval is defined by the time interval of charging the timing capacitor from the low voltage to the threshold voltage, the reciprocal of the predetermined time interval is a frequency in the ultrasonic wave frequency range.