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:
Mar. 09, 1999
Filed:
May. 02, 1997
Fang-Jye Leu, Taipei Hsien, TW;
Acer Peripherals Inc., , TW;
Abstract
An improved power supply device decreases the amount of power used in computer and computer peripheral devices by utilizing a control transistor which is set into a switching operation responsive to a pulse signal received from a power supply control circuit. The control transistor controls the voltage applied to the primary winding of the power transformer by a switch transistor, and issues an output voltage from the secondary winding. The power supply device includes a switch circuit which is connected in series to a starting resistor for supplying the output voltage rectified from the AC power source when starting up to the power supply control circuit. The power supply device includes a switch-control circuit which turns off the switch circuit when the output voltage rectified from the AC output of the tertiary winding of the power transformer reaches a voltage high enough for stable operation of the power supply control circuit. The present invention is characterized by a separation device, coupled to the starting terminal of the power supply control circuit and the power source of the tertiary winding of the power transformer, to ensure that there is no need for an extremely high voltage to drive the switch-control circuit. As a result, the power loss at the starting resistor is eliminated after startup of the power supply device such that the power consumption of the power saving operation is also eliminated.