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. 12, 2021
Filed:
Dec. 10, 2019
Delta Electronics (Shanghai) Co., Ltd, Shanghai, CN;
Delta Electronics (Shanghai) CO., LTD, Shanghai, CN;
Abstract
The present disclosure discloses a device and a method for driving an LED. The device includes: a rectifier circuit for receiving an AC voltage and convert the AC voltage into a first DC voltage; a capacitance-adjusting circuit including a first capacitor, a second capacitor and a switch; and a DC-DC converter for converting the first DC voltage into a second DC voltage, wherein a range of a voltage value of the AC voltage comprises a first AC voltage range and a second AC voltage range, and when the voltage value of the AC voltage is in the first AC voltage range, the capacitance-adjusting circuit has a first capacitance value; and when the voltage value of the AC voltage is in the second AC voltage range, the capacitance-adjusting circuit has a second capacitance value, and the first capacitance value is greater than the second capacitance value.