US 12,289,040 B2
Driving circuit and projection device
Chia-Wen Hsu, Hsin-Chu (TW); Chen-Wang Chen, Hsin-Chu (TW); and Tung-Min Lee, Hsin-Chu (TW)
Assigned to Coretronic Corporation, Hsin-Chu (TW)
Filed by Coretronic Corporation, Hsin-Chu (TW)
Filed on Sep. 14, 2022, as Appl. No. 17/945,051.
Claims priority of application No. 202111085372.5 (CN), filed on Sep. 16, 2021.
Prior Publication US 2023/0083055 A1, Mar. 16, 2023
Int. Cl. H02M 1/00 (2007.01); H02M 3/157 (2006.01); H04N 9/31 (2006.01)
CPC H02M 1/0009 (2021.05) [H02M 3/157 (2013.01); H04N 9/3135 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A driving circuit, for driving a light source, comprising:
a power converter, coupled to the light source, configured to provide a driving power to the light source;
a detection circuit, configured to provide a feedback signal according to a current value of the light source; and
a control circuit, coupled to the detection circuit and the power converter, configured to receive an operation command and the feedback signal and determine whether the driving circuit enters a light-load state according to at least one of the operation command and the feedback signal,
wherein the control circuit is configured to control the power converter to decrease a current value of the driving power in response to the operation command in the light-load state when the driving circuit is determined to enter the light-load state, and the control circuit is configured to control the power converter to increase a switching frequency of the driving power.