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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.:

US 10340787 B1

PDFFull Text
Date of Patent:
Jul. 02, 2019

Filed:

Apr. 17, 2015

Power factor correction stage control during start-up for efficient use of a negative temperature coefficient thermistor

Applicant:

Astec International Limited, Kowloon, HK;

Inventors:

Jun Liu, Shenzhen, CN;

Qingfeng Liu, Shenzhen, CN;

Zhaotu Fan, Shenzhen, CN;

Zhe Li, Shenzhen, CN;

Assignee:

Astec International Limited, Kwun Tong, Kowloon, HK;

Attorney:

Harness, Dickey & Pierce, P.L.C.

Primary Examiner:

Jue Zhang

Assistant Examiner:

Bart Iliya

Int. Cl.
CPC ...
H02M 1/42 (2007.01); H02M 7/06 (2006.01); H02M 1/32 (2007.01); H02M 1/36 (2007.01); H02H 9/00 (2006.01);
U.S. Cl.
CPC ...
H02M 1/4241 (2013.01); H02H 9/001 (2013.01); H02M 1/32 (2013.01); H02M 1/36 (2013.01); H02M 1/4225 (2013.01); H02M 7/06 (2013.01); H02M 2001/327 (2013.01); Y02B 70/126 (2013.01); Y02P 80/112 (2015.11);
Abstract

A power factor correction (PFC) stage of a power supply unit has a PFC circuit including a rectifier circuit, a PFC controller circuit with a PFC switch, a current sensor connected to the PFC switch, a high frequency bypass capacitor connected between the PFC controller circuit and the rectifier circuit, and a bulk storage capacitor connected between the PFC controller circuit and an output of the PFC stage. The PFC stage also has a negative temperature coefficient thermistor connected in series with the PFC switch and the current sensor. During a start-up of the power supply unit, the PFC controller circuit causes the PFC switch to turn-on until the PFC controller circuit causes the PFC switch to turn-off after a current through the current sensor is sensed as being equal to or greater than a preset value.

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Liu, Jun. (2019). Power factor correction stage control during start-up for efficient use of a negative temperature coefficient thermistor (U.S. Patent No. 10340787). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/10340787

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