Abstract: A memory system includes a host interface, a nonvolatile memory, a power supply circuit, a protection circuit, and a first voltage monitor circuit. The power supply circuit is between the host interface and the nonvolatile memory, and supplies primary power to the nonvolatile memory. The protection circuit is between the host interface and the power supply circuit, and configured to clamp a power supply signal supplied from the host interface to the power supply circuit to a first voltage. The first voltage monitor circuit is between the host interface and the protection circuit, and configured to monitor a voltage level of the power supply signal supplied from the host interface and cause the voltage level of the power supply signal supplied to the power supply circuit to be decreased from the first voltage to a second voltage when the monitored voltage level is below a first threshold voltage.

Abstract: A memory system includes a host interface, a nonvolatile memory, a power supply circuit, a protection circuit, and a first voltage monitor circuit. The power supply circuit is between the host interface and the nonvolatile memory, and supplies primary power to the nonvolatile memory. The protection circuit is between the host interface and the power supply circuit, and configured to clamp a power supply signal supplied from the host interface to the power supply circuit to a first voltage. The first voltage monitor circuit is between the host interface and the protection circuit, and configured to monitor a voltage level of the power supply signal supplied from the host interface and cause the voltage level of the power supply signal supplied to the power supply circuit to be decreased from the first voltage to a second voltage when the monitored voltage level is below a first threshold voltage.

Abstract: According to one embodiment, an electronic device includes a capacitor, a power supply device, a discharger and a capacitance detector. The capacitor is used as a backup power supply. The power supply device charges the capacitor. The discharger discharges the capacitor. The capacitance detector maintains a terminal voltage of the capacitor at a given level for a predetermined time, by controlling an operating time of the power supply device. The capacitance detector allows the discharger to start the discharge the predetermined time later. The capacitance detector detects a capacitance of the capacitor based on a transient response characteristic of the discharge.

Abstract: According to one embodiment, an electronic device includes a capacitor, a power supply device, a discharger and a capacitance detector. The capacitor is used as a backup power supply. The power supply device charges the capacitor. The discharger discharges the capacitor. The capacitance detector maintains a terminal voltage of the capacitor at a given level for a predetermined time, by controlling an operating time of the power supply device. The capacitance detector allows the discharger to start the discharge the predetermined time later. The capacitance detector detects a capacitance of the capacitor based on a transient response characteristic of the discharge.

Abstract: According to one embodiment, an electronic device includes a capacitor, a power supply device, a discharger and a capacitance detector. The capacitor is used as a backup power supply. The power supply device charges the capacitor. The discharger discharges the capacitor. The capacitance detector maintains a terminal voltage of the capacitor at a given level for a predetermined time, by controlling an operating time of the power supply device. The capacitance detector allows the discharger to start the discharge the predetermined time later. The capacitance detector detects a capacitance of the capacitor based on a transient response characteristic of the discharge.

Abstract: In a waste gate valve, a coil spring being expandable and contractible in the axial direction of a valve shaft is provided between a washer and an attachment tongue in an axial direction of a valve shaft of a valve. The coil spring is made of a heat-resistant alloy or a ceramic. An annular guard wall is formed on a front surface of the attachment tongue by counter boring in such a way as to surround the coil spring.

Abstract: A turbine housing includes a scroll passage provided with a housing tongue. A groove portion (a notch) is formed in a wall surface on the scroll passage side of the housing tongue. The groove portion is located at a position close to an edge portion on the flange side of the wall surface. The groove portion extends from a tip end side of the housing tongue in an extending direction of the scroll passage. In a cross section orthogonal to the extending direction of the scroll passage, a curvature radius of the deepest part of the groove portion is smaller than a minimum curvature radius of the wall surface of the housing tongue.

Abstract: According to one embodiment, an electronic device includes a capacitor, a power supply device, a discharger and a capacitance detector. The capacitor is used as a backup power supply. The power supply device charges the capacitor. The discharger discharges the capacitor. The capacitance detector maintains a terminal voltage of the capacitor at a given level for a predetermined time, by controlling an operating time of the power supply device. The capacitance detector allows the discharger to start the discharge the predetermined time later. The capacitance detector detects a capacitance of the capacitor based on a transient response characteristic of the discharge.