US 12,267,019 B2
Power supply apparatus capable of switching output resistance
Hiroki Asano, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Nov. 9, 2023, as Appl. No. 18/505,346.
Claims priority of application No. 2022-197364 (JP), filed on Dec. 9, 2022.
Prior Publication US 2024/0195308 A1, Jun. 13, 2024
Int. Cl. G03G 15/00 (2006.01); H02M 3/335 (2006.01)
CPC H02M 3/33523 (2013.01) [G03G 15/5004 (2013.01); H02M 3/33569 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A power supply apparatus comprising:
a first power supply configured to apply a DC voltage with a first polarity to a load;
a second power supply connected in parallel with the first power supply, the second power supply being configured to apply a DC voltage with a second polarity, opposite the first polarity, to the load via a first resistor connected to the load;
a resistance switching circuit including a second resistor forming an output resistance of the first power supply, the resistance switching circuit being configured to switch between a state in which the second resistor forms part of the output resistance and a state in which the second resistor does not form part of the output resistance; and
a control circuit configured to control the first power supply, the second power supply, and the resistance switching circuit,
wherein the control circuit is configured to
in a case where the DC voltage with the first polarity is applied to the load from the first power supply, control the resistance switching circuit such that the second resistor does not form part of the output resistance, and
in a case where the DC voltage with the second polarity is applied to the load from the second power supply, control the resistance switching circuit such that the second resistor forms part of the output resistance, and
a resistance value of the output resistance when the second resistor is formed as part of the output resistance is greater than a resistance value of the output resistance when the second resistor is not formed as part of the output resistance.