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:
Oct. 29, 2019
Filed:
May. 04, 2017
Dell Products, Lp, Round Rock, TX (US);
Chi-Che Wu, Taipei, TW;
Wei-Cheng Yu, New Taipei, TW;
Yung Chang Chang, New Taipei, TW;
Ya-Tang Hsieh, Taipei, TW;
Dell Products, LP, Round Rock, TX (US);
Abstract
A system and method of operating an a power supply unit with a light load efficiency control system comprising a power regulator circuit for receiving an alternating current (AC) input voltage from within a range of accommodated AC input voltages and including a power factor correction (PFC) circuit and an LLC resonator circuit having a bulk capacitance voltage level and operable to receive the input AC voltage in the power supply unit and where the power supply unit generates a direct current (DC) output voltage for use by a load. The power supply unit having a processor logic core for the power regulator circuit to control a plural stage bulk capacitor voltage level having at least a high step bulk capacitor voltage level for operation when a normal load is applied to the power supply unit and a low step bulk capacitor voltage level for operation under light load conditions and a light load control circuit for receiving a control input voltage representative of the AC input voltage received by the power supply unit, comparing via a comparator circuit the control input voltage to a reference voltage generated to represent a threshold level of AC input voltage, and activating a light load control feedback signal to the processor logic core if the control input voltage exceeds the reference voltage level under light load operating conditions.