Patent application number | Description | Published |
20100219801 | SWITCHING POWER SUPPLY, CONTROL CIRCUIT CONTROLLING SWITCHING POWER SUPPLY AND CONTROL METHOD OF SWITCHING POWER SUPPLY - A switching power supply includes: a first switch provided between one end of a DC power supply and one end of a load; a second switch provided between a node of the first switch located on a load side and another end of the DC power supply; a capacitor provided between the second switch and the another end of the DC power supply; a third switch provided between a node of the first switch located on a DC power supply side and a node between the second switch and the capacitor; and a delay circuit that is provided between the third switch and the node between the second switch and the capacitor and delays a current for charging the capacitor, wherein the second switch is turned on in a period during which the first switch is kept on. | 09-02-2010 |
20100220416 | SWITCHING POWER SUPPLY, CONTROL CIRCUIT FOR CONTROLLING SWITCHING POWER SUPPLY, CONTROL METHOD OF SWITCHING POWER SUPPLY AND MODULE SUBSTRATE - A switching power supply includes: a first switch provided between a positive terminal of a DC power supply and a positive terminal of a load; a second switch connected in parallel with the first switch; a first capacitor provided between the second switch and a node of the first switch on a DC power supply side; a first inductor provided between the first capacitor and the positive terminal of the DC power supply; and a control circuit that turns off the second switch after the first switch is turned off and when or before a voltage across the first capacitor becomes zero. | 09-02-2010 |
20110057519 | SWITCH CIRCUIT - The present invention is a switch circuit equipped with a first switch connected between another end of an inductive load having a one end connected to a one end of a DC power supply and another end of the DC power supply, a capacitor connected between the another end of the inductive load and the another end of the DC power supply and connected in parallel with the first switch, a second switch that connects the another end of the inductive load and the capacitor, a third switch that connects a one end of the capacitor on an inductive load side to the one end of the inductive load so as to be parallel to the second switch, and a control circuit that turns ON the second switch before the first switch is turned OFF and turns OFF the second switch before the first switch is turned ON after being turned OFF. | 03-10-2011 |
20110215788 | DC-DC CONVERTER - The present invention is a DC-DC converter characterized by including a switch element that is provided between one end of a DC power source and one end of a load and turns ON and OFF current input from the DC power source, an inductance element that is provided between one end of the switch element on a load-side end and includes a doughnut-shaped magnetic core and a conductive wire wound around the magnetic core, a commutation switch provided between a node between the switch element and the inductance element and a ground potential, and a capacitance element provided between a node between the inductance element and the load and the ground potential, wherein a magnetic flux density of the magnetic core varies partially. | 09-08-2011 |
20120008351 | VOLTAGE-DIVIDING POWER FACTOR CORRECTION CIRCUIT, VOLTAGE-DIVIDING POWER FACTOR CORRECTION APPARATUS AND VOLTAGE-DIVIDING POWER FACTOR CORRECTION METHOD - A circuit include: a first power factor correction circuit that forces current produced by the positive AC voltage to be in phase with the positive AC voltage so that a power factor of electric power is improved; a second power factor correction circuit that forces current produced by the negative AC voltage to be in phase with the negative AC voltage so that a power factor of electric power is improved; and an output circuit including a first capacitor storing first electric power with a power factor improved by the first power factor correction circuit and a second capacitor storing second electric power with a power factor improved by the second power factor correction circuit, the first capacitor and the second capacitor being provided in series, the output circuit outputting the first electric power stored in the first capacitor and the second electric power stored in the second capacitor. | 01-12-2012 |
20120153929 | DC-DC CONVERTER, MODULE, POWER SUPPLY DEVICE, AND ELECTRONIC APPARATUS - A controller CT | 06-21-2012 |
20120163052 | Power supply unit and information processor - A power supply unit includes multiple input terminals to which alternating-current power is input; a positive terminal and a negative terminal for outputting direct-current power; a rectifier circuit configured to rectify the input alternating-current power; a first inductor connected to the rectifier circuit; a first capacitor connected between the positive terminal and the negative terminal; a first rectifying device connected between the output terminal of the first inductor and the positive terminal and having a rectification direction in a direction from the output terminal of the first inductor toward the positive terminal; a switching device connected between an input terminal of the first rectifying device and the negative terminal; a second rectifying device and a second capacitor connected in parallel to the switching device; and a second inductor connected between a connection of the second rectifying device and the second capacitor and the positive terminal. | 06-28-2012 |
20120182769 | DC-DC CONVERTER, POWER SUPPLY UNIT AND AN INFORMATION PROCESSING APPARATUS - A DC-DC converter is disclosed that includes a first winding of a first transformer to which direct current power is supplied, a switching element configured to be connected in series with the first winding of the first transformer, a first winding of a second transformer and a capacitor configured to be connected in series with each other and in parallel with the switching element, a second winding of the first transformer configured to be coupled with the first winding of the first transformer, output terminals configured to be connected to the second winding of the first transformer and to output direct current power, and a pair of second windings of the second transformer configured to be coupled with the first winding of the second transformer, the second windings of the second transformer being connected in parallel with each other with reverse polarity between the output terminals. | 07-19-2012 |
20120242302 | POWER SUPPLY DEVICE - A power supply device includes a step-down unit to step down an input voltage, a switching unit to perform switching on a stepped-down voltage obtained through the stepping down by the step-down unit so as to externally output the voltage, an output variation detection unit to detect a corresponding variation of output from the switching unit, a delay unit to delay the input voltage by a prescribed time period, a delay variation detection unit to detect a corresponding variation of a delayed voltage output from the delay unit, an addition unit to add corresponding variations of the power supply voltage and the delayed voltage respectively detected by the output variation detection unit and the delay variation detection unit, and a control unit to perform feedback control on the basis of the corresponding variations of the power supply voltage and the delayed voltage added by the addition unit. | 09-27-2012 |