Abstract: A power supply circuit is a power supply circuit that generates a direct current (DC) voltage from an alternating current (AC) voltage, and includes a rectifying circuit that rectifies the AC voltage, a capacitor that smooths the rectified voltage, a first switching element disposed on a path for charging the capacitor, a comparison circuit that compares an index voltage depending on the smoothed voltage with a reference voltage, and a driving circuit that sets the first switching element to an ON state, in a state in which the index voltage is lower than the reference voltage, and sets the first switching element to an OFF state, in a state in which the index voltage exceeds the reference voltage.

Abstract: A power supply circuit supplies a direct current voltage to an audio processing device. The power supply circuit includes: a converting circuit configured to convert an alternating current voltage into a DC voltage; a detection circuit configured to detect a state in which the AC voltage lower than a threshold continues for a given period of time; and a notification circuit configured to, when the detection circuit detects the state representative of an AC voltage drop, notify the audio processing device of the AC voltage drop.

Abstract: A power supply circuit includes an internal power source that receives power supply from an external power source, an abnormality detection circuit that receives power supply from the internal power source to detect abnormalities of the external power source, a protection target circuit that receives the power supply from the external power source, and a protection function unit that restricts electric power supplied to the protection target circuit to a predetermined range, when the abnormality detection circuit detects the abnormalities.

Abstract: A power supply circuit includes an internal power source that receives power supply from an external power source, an abnormality detection circuit that receives power supply from the internal power source to detect abnormalities of the external power source, a protection target circuit that receives the power supply from the external power source, and a protection function unit that restricts electric power supplied to the protection target circuit to a predetermined range, when the abnormality detection circuit detects the abnormalities.

Abstract: A power supply circuit supplies a direct current voltage to an audio processing device. The power supply circuit includes: a converting circuit configured to convert an alternating current voltage into a DC voltage; a detection circuit configured to detect a state in which the AC voltage lower than a threshold continues for a given period of time; and a notification circuit configured to, when the detection circuit detects the state representative of an AC voltage drop, notify the audio processing device of the AC voltage drop.

Abstract: A power supply circuit is a power supply circuit that generates a direct current (DC) voltage from an alternating current (AC) voltage, and includes a rectifying circuit that rectifies the AC voltage, a capacitor that smooths the rectified voltage, a first switching element disposed on a path for charging the capacitor, a comparison circuit that compares an index voltage depending on the smoothed voltage with a reference voltage, and a driving circuit that sets the first switching element to an ON state, in a state in which the index voltage is lower than the reference voltage, and sets the first switching element to an OFF state, in a state in which the index voltage exceeds the reference voltage.

Abstract: A power supply circuit includes an internal power source that receives power supply from an external power source, an abnormality detection circuit that receives power supply from the internal power source to detect abnormalities of the external power source, a protection target circuit that receives the power supply from the external power source, and a protection function unit that restricts electric power supplied to the protection target circuit to a predetermined range, when the abnormality detection circuit detects the abnormalities.

Abstract: A semiconductor device includes a plurality of capacitor cells having respective lower electrodes to which signals are applied and respective upper electrodes arranged to face the respective lower electrodes, wherein each interconnect connected to a corresponding one of the lower electrodes includes a shield interconnect section enclosing a corresponding one of the upper electrodes.

Abstract: Disclosed a switching power supply circuit of current resonance type including: a switching element; an LC resonance circuit to resonate current flowing through the switching element; and a detection circuit to perform a detection associated with an output current amount on the basis of an operation timing of the switching element and a voltage under resonating operation of the LC resonance circuit.

Abstract: A semiconductor device includes a plurality of capacitor cells having respective lower electrodes to which signals are applied and respective upper electrodes arranged to face the respective lower electrodes, wherein each interconnect connected to a corresponding one of the lower electrodes includes a shield interconnect section enclosing a corresponding one of the upper electrodes.

Abstract: Disclosed is a multiphase DC-DC converter including a plurality of DC-DC converter circuits connected in parallel to one another; an output section to add up outputs of the plurality of DC-DC converter circuits to obtain one output; a timing generating circuit to generate timing signals for respectively operating the plurality of DC-DC converter circuits; a control circuit to selectively and sequentially operate the plurality of DC-DC converter circuits in synchronization with the timing signals outputted from the timing generating circuit so that output phases of the plurality of DC-DC converter circuits are different from one another; and a current detection circuit to detect an output current of each of the plurality of DC-DC converter circuits, wherein the control circuit selects one of the plurality of DC-DC converter circuit to be operated next based on an output of the current detection circuit.

Abstract: Disclosed a switching power supply circuit of current resonance type including: a switching element; an LC resonance circuit to resonate current flowing through the switching element; and a detection circuit to perform a detection associated with an output current amount on the basis of an operation timing of the switching element and a voltage under resonating operation of the LC resonance circuit.

Abstract: Disclosed is a multiphase DC-DC converter including a plurality of DC-DC converter circuits connected in parallel to one another; an output section to add up outputs of the plurality of DC-DC converter circuits to obtain one output; a timing generating circuit to generate timing signals for respectively operating the plurality of DC-DC converter circuits; a control circuit to selectively and sequentially operate the plurality of DC-DC converter circuits in synchronization with the timing signals outputted from the timing generating circuit so that output phases of the plurality of DC-DC converter circuits are different from one another; and a current detection circuit to detect an output current of each of the plurality of DC-DC converter circuits, wherein the control circuit selects one of the plurality of DC-DC converter circuit to be operated next based on an output of the current detection circuit.