Title:
CONTROL CIRCUIT, DRIVE CIRCUIT, CONTROL METHOD AND ILLUMINATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2020/244670
Kind Code:
A1
Abstract:
Disclosed are a control circuit, a drive circuit, a control method and an illumination apparatus. The control circuit is used for controlling an electrical loop formed by connecting a direct current power supply with n LED groups in series, and comprises a control unit and m branch switch units; each of the branch switch units corresponds to one LED group; the control unit respectively controls the turning-on or turning-off of the branch switch units; when an output voltage of the direct current power supply is not less than the sum of turning-on voltage drops of the n LED groups, the control unit cuts off the m branch switch units to form a main loop; and when the output voltage thereof is less than the sum of the turning-on voltage drops of the n LED groups, the control unit turns on at least one branch switch unit, and cuts off the remaining branch switch units to form branch loops. In the present invention, where the output voltage of the direct current power supply is reduced, the turning-on or turning-off of the branch switch units is controlled, so that LEDs can still be illuminated if the output voltage is reduced.
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Inventors:
SHAO YUNQI (CN)
XU YONG (CN)
XU YONG (CN)
Application Number:
PCT/CN2020/094996
Publication Date:
December 10, 2020
Filing Date:
June 08, 2020
Export Citation:
Assignee:
SHANGHAI LOOALL ELECTRONICS CO ITD (CN)
International Classes:
H01L33/00; H05B44/00
Foreign References:
| CN103428959A | 2013-12-04 | |||
| CN101668363A | 2010-03-10 |
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