US 12,593,384 B2Granted

LED driver and operating method thereof

AssigneeDelta Electronics, Inc.

InventorsChing-Ho Chou, Yung-Chuan Lu, Ming-Lung Hsieh, Chia-Chang Hsu, Ming-Wei Chou, Sheng-Jian Chen, Cheng-Chieh Ou, Wei-Chieh Chao, Yang-Sheng Sun

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Abstract

An LED driver is couple to a first LED module and a second LED module, and the LED driver includes a first power conversion module, a switch, a second power conversion module, and a control module. The control module controls the switch to conduct so as to provide a second DC voltage and a third DC voltage outputted by the first power conversion module to the first LED module. The control module controls the switch not to conduct, and controls the second power conversion module to provide a fourth DC voltage, a fifth DC voltage, and a sixth DC voltage according to the second DC voltage for providing the fourth DC voltage, the fifth DC voltage, and the sixth DC voltage to the second LED module.

Claims13

Dependent claims

An LED driver, configured to be coupled to a first LED module and a second LED module, comprising:

a first power conversion module configured to convert a first DC voltage into a second DC voltage and a third DC voltage,
a switch coupled to the first power conversion module, and configured to be coupled to the first LED module,
a second power conversion module coupled to the first power conversion module, and configured to be coupled to the second LED module, and
a control module coupled to the first power conversion module, the switch, and the second power conversion module,
wherein the control module is configured to conduct the switch for providing the second DC voltage and the third DC voltage to the first LED module;
the control module is configured to not conduct the switch and controls the second power conversion module to provide a fourth DC voltage, a fifth DC voltage, and a sixth DC voltage according to the second DC voltage so as to provide the fourth DC voltage, the fifth DC voltage, and the sixth DC voltage to the second LED module.

3 more elements

A method of operating an LED driver, wherein the LED driver is coupled to a first LED module and a second LED module and comprises a first power conversion module and a second power conversion module, comprising steps of:

(a) receiving a first DC voltage,
(b) controlling the first power conversion module to convert the first DC voltage into a second DC voltage and a third DC voltage for providing the second DC voltage and the third DC voltage to the first LED module when the LED driver operates in a first working mode, and
(c) controlling the second power conversion module to convert the second DC voltage into a fourth DC voltage, a fifth DC voltage, and a sixth DC voltage for providing the fourth DC voltage, the fifth DC voltage, and the sixth DC voltage to the second LED module when the LED driver operates in a second working mode.

Dependencies are inferred from the claim text.