Abstract: A power supply device including: a boosting circuit that boosts power supplied from a power source to a target voltage based on a voltage of a secondary battery capable of supplying power to a load, and supplies the boosted power to the load.

Abstract: A flyback boost circuit includes an output voltage detection terminal provided to a secondary winding of a transformer of the flyback boost circuit, and configured to detect an output voltage. Prior to the start of a boost operation, current is supplied to a secondary side of the transformer via the output voltage detection terminal to detect a voltage generated at the output voltage detection terminal, to thereby detect an unwired state by determining whether or not there is floating of the output voltage detection terminal or a grounding terminal of the secondary winding of the transformer.

Abstract: An imaging apparatus including a strobe device having a charging circuit of a separately excited oscillation type is provided. The apparatus includes a main capacitor in which charge is accumulated to supply power to a strobe-light-flashing unit, a step-up transformer including at least primary and secondary coils, a switching element that performs a switching operation to control a current supplied to the primary coil, a rectifier diode that rectifies a flyback pulse generated in the secondary coil to supply a charging voltage to the main capacitor, a power-supply-interrupting circuit that selectively interrupts power supplied from the power supply, a full-charge detection unit that detects whether the main capacitor reaches a fully charged state, and a power-supply-control unit that controls the power-supply-interrupting circuit so as to set the power-supply-interrupting circuit to be in an interrupting state.

Abstract: A flyback boost circuit includes an output voltage detection terminal provided to a secondary winding of a transformer of the flyback boost circuit, and configured to detect an output voltage. Prior to the start of a boost operation, current is supplied to a secondary side of the transformer via the output voltage detection terminal to detect a voltage generated at the output voltage detection terminal, to thereby detect an unwired state by determining whether or not there is floating of the output voltage detection terminal or a grounding terminal of the secondary winding of the transformer.

Abstract: An imaging apparatus including a strobe device having a charging circuit of a separately excited oscillation type is provided. The apparatus includes a main capacitor in which charge is accumulated to supply power to a strobe-light-flashing unit, a step-up transformer including at least primary and secondary coils, a switching element that performs a switching operation to control a current supplied to the primary coil, a rectifier diode that rectifies a flyback pulse generated in the secondary coil to supply a charging voltage to the main capacitor, a power-supply-interrupting circuit that selectively interrupts power supplied from the power supply, a full-charge detection unit that detects whether the main capacitor reaches a fully charged state, and a power-supply-control unit that controls the power-supply-interrupting circuit so as to set the power-supply-interrupting circuit to be in an interrupting state.