US 12,445,045 B2
Power supply apparatus and image forming apparatus
Junya Kobayashi, Shizuoka (JP); and Masaki Inagaki, Shizuoka (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Apr. 18, 2023, as Appl. No. 18/302,357.
Claims priority of application No. 2022-070835 (JP), filed on Apr. 22, 2022.
Prior Publication US 2023/0344334 A1, Oct. 26, 2023
Int. Cl. H02M 1/32 (2007.01); H02M 3/335 (2006.01)
CPC H02M 1/32 (2013.01) [H02M 3/335 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A power supply apparatus configured to supply an output voltage corresponding to a voltage induced by a secondary winding, the power supply apparatus comprising:
a transformer including a primary winding, the secondary winding, and an auxiliary winding;
a switching element connected to the primary winding and configured to perform a switching operation;
a first control device configured to operate by being supplied with a first voltage and configured to control the switching operation of the switching element; and
a first detection device configured to detect an overload state,
wherein, in a case where the overload state is detected by the first detection device after the switching operation is started and before the output voltage reaches a target voltage, the first control device performs a first process of maintaining a state where the switching operation is stopped,
wherein, in a case where the overload state is detected by the first detection device after the output voltage reaches the target voltage, the first control device performs a second process of stopping the switching operation and, after a lapse of a first time, resuming the switching operation, and
wherein the first control device performs detection of the overload state by the first detection device after the output voltage changes to a second voltage lower than the target voltage after a start of the switching operation.