Abstract: A power supply device includes: a rectifier having an input terminal connected to one end of a switching element configured to perform synchronous rectification; a coil having one end connected to an output terminal of the power supply device; and a second capacitor connected in series to a first capacitor, the first capacitor having one end grounded, the second capacitor having one end connected to a connection point between another end of the first capacitor and the one end of the coil, and the second capacitor having another end connected to an output terminal of the rectifier.

Abstract: A power supply device includes: a switching element that performs synchronous rectification on a power to be induced in a first secondary wiring of a transformer that performs voltage conversion; a first current detection circuit that detects a value of a current to be induced in a second secondary wiring of the transformer; a second current detection circuit that detects a change in the current to be induced in the second secondary wiring, the second current detection circuit having a higher response speed with respect to conversion of the current than that of the first current detection circuit; and a control unit (control circuit) that determines based on the change in the current detected by the second current detection circuit whether or not backflow is occurring, and controls the switching element in accordance with a result of the determination.

Abstract: A storage (80) stores a first drooping characteristic of a rated current Ioc1, and a second drooping characteristic of an allowable current value Ico2 that is greater than the rated current value Ioc1. A controller (70) is configured to select a drooping characteristic stored in the storage (80) in accordance with the current value detected by an output current detector (50) and a mask condition, and perform droop control.

Abstract: A storage (80) stores a first drooping characteristic of a rated current Ioc1, and a second drooping characteristic of an allowable current value Ico2 that is greater than the rated current value Ioc1. A controller (70) is configured to select a drooping characteristic stored in the storage (80) in accordance with the current value detected by an output current detector (50) and a mask condition, and perform droop control.

Abstract: A power supply device includes: a switching element that performs synchronous rectification on a power to be induced in a first secondary wiring of a transformer that performs voltage conversion; a first current detection circuit that detects a value of a current to be induced in a second secondary wiring of the transformer; a second current detection circuit that detects a change in the current to be induced in the second secondary wiring, the second current detection circuit having a higher response speed with respect to conversion of the current than that of the first current detection circuit; and a control unit (control circuit) that determines based on the change in the current detected by the second current detection circuit whether or not backflow is occurring, and controls the switching element in accordance with a result of the determination.

Abstract: A power supply device includes: a rectifier having an input terminal connected to one end of a switching element configured to perform synchronous rectification; a coil having one end connected to an output terminal of the power supply device; and a second capacitor connected in series to a first capacitor, the first capacitor having one end grounded, the second capacitor having one end connected to a connection point between another end of the first capacitor and the one end of the coil, and the second capacitor having another end connected to an output terminal of the rectifier.