Abstract: A switching power supply circuit includes: a reactor that has a main winding and an auxiliary winding having a leakage inductance, which are magnetically coupled with each other and are connected with each other at one ends thereof; a first series circuit, which has an auxiliary switch and a resonance capacitor connected in series, and which is connected in parallel with a direct current power supply via a main switch; a first diode that, which is connected in parallel with the first series circuit via the auxiliary winding; a smoothing capacitor, which is connected in parallel with at least one of the first series circuit and first diode via the main winding; and a control circuit, which alternately turns on and off the main switch and auxiliary switch to thus control an output voltage of the smoothing capacitor to be a predetermined value.

Abstract: A current detection circuit comprises: a series circuit of a first current detection part series to a first semiconductor and a second current detection part, which detects current having a smaller range than the first current detection part; a second semiconductor device, which is provided with a second drive circuit, connected in parallel with the second current detection part; and a current determination circuit configured to switch between the first current detection part and the second current detection part, based on the magnitude of the detection current of the first current detection part, wherein, when the detection current of the first current detection part is larger than a predetermined value, the voltage from the first current detection part is output, and wherein, when the detection current of the first current detection part is smaller than the predetermined value, the voltage from the second current detection part is output.

Abstract: A level shifter includes a resistor R1 connected to a power source, a MOSFET MN3 having a drain connected to the resistor R1 and a grounded source, a resistor R2 having the same resistance of the resistor R1 and connected to the power source, a MOSFET MN4 having a drain to the resistor R2 and a grounded source, a pulse generator 10 controlling ON/OFF of the MOSFETs MN3 and MN4 according to an input signal, a control part generating a set signal when the MOSFET MN3 is ON and a reset signal when the MOSFET MN4 is ON, a flip-flop that providing, according to the set and reset signals, an output signal level-shifted of the input signal to operate a switching element Q1, and a switching operation control part detecting when reference potential decreases to negative and stopping the switching element Q1.

Abstract: A light emitting element driving device, which flashing-drive a plurality of light emitting element arrays connected in parallel by switching elements connected in series with each of the plurality of light emitting element arrays, the light emitting element driving device including: a current detection unit configured to detect respective currents flowing through each of the plurality of light emitting element arrays as currents of the light emitting element arrays; a selection unit configured to select the smallest current of the light emitting element arrays of the detected currents obtained by the current detection unit; and an output voltage control unit configured to control output voltage supplied to the plurality of light emitting element arrays so that the current of the light emitting element arrays selected by the selection unit becomes a preset reference current value.

Abstract: An information processing device stores, in a storage device, command execution user data associating an attribute of a command with a name of a user entitled to execute the command. When execution of the command is requested, a service of the information processing device extracts, from the command execution user data, a name of a user entitled to execute the requested command and executes the command with the extracted user name.

Abstract: A gate driver for driving a switching element Q1 that is able to be bidirectionally conductive includes a drive part 2 that applies a positive voltage to a gate of the switching element to turn on the switching element and a negative voltage to the gate to turn off the switching element and a negative voltage release part 3 that, before a reverse current is passed to the switching element, releases the negative voltage from being applied to the gate of the switching element.