Patent application number | Description | Published |
20080284390 | DC-DC CONVERTER - A DC-DC converter includes a series circuit of a switch element Q | 11-20-2008 |
20080316785 | POWER SOURCE APPARATUS - A power source apparatus has a series circuit connected between output terminals of a DC power source, the series circuit including a primary winding of a transformer and a switching element; a controller configured to control an ON/OFF operation of the switching element; and an output diode connected between terminals of a second winding of the transformer and configured to rectify an alternating current that is induced on the secondary winding when the controller turns on/off the switching element. The output diode includes a plurality of diodes that are connected in parallel with one another and are made of wide-gap semiconductor. | 12-25-2008 |
20090027930 | AC-DC CONVERTER - An AC-DC converter includes a rectifier DB for rectifying an alternating current supplied from an alternating power source AC, a power factor controller | 01-29-2009 |
20090027931 | AC-DC CONVERTER - An AC-DC converter includes a rectifier DB for rectifying an alternating current supplied from an alternating power source AC, a power factor controller | 01-29-2009 |
20090190382 | POWER FACTOR CORRECTING CONVERTER - A power factor correcting converter includes a rectifier to rectify an AC voltage of an AC power source into a pulsating voltage, a voltage converter having a switching element, to convert the pulsating voltage into a predetermined DC voltage with the switching element being turned on/off according to a control signal, an smoothing circuit to smooth the control signal, and a control signal generator to generate the control signal and change a switching frequency of the control signal according to an output from the smoothing circuit. | 07-30-2009 |
20090303751 | POWER SOURCE APPARATUS AND CONTROL METHOD THEREOF - A power source apparatus includes a DC voltage generator ( | 12-10-2009 |
20100127685 | POWER SOURCE APPARATUS - A power source apparatus has a power source unit (AC, DB, Ci), a pair of reactors L | 05-27-2010 |
20100265741 | POWER FACTOR CORRECTING CONVERTER - A power factor correcting converter includes a DC-DC converter to convert a DC voltage, which is formed by rectifying an AC voltage of an AC power source through a rectifier, into a DC voltage of the DC-DC converter and a step-up converter to step up the DC voltage of the DC-DC converter. Secondary windings of a transformer Ta in the DC-DC converter are directly connected to the step-up converter. | 10-21-2010 |
20100302817 | DC-DC CONVERTER - A DC-DC converter includes a plurality of switch elements connected in series between both ends of a DC power source, a series circuit of a primary winding of a transformer and a capacitor, connected between a connection point of the plurality of switch elements and an end of the DC power source, a rectifying-smoothing circuit to rectify and smooth a voltage generated by a secondary winding of the transformer into a DC voltage, and a controller to change a switching frequency of the plurality of switch elements according to a feedback signal generated from the DC voltage and alternately turn on/off the plurality of switch elements. The controller includes a nonlinear response unit | 12-02-2010 |
20110007529 | DC-TO-DC CONVERTER - The present invention includes: a plurality of switching elements connected in series and connected between two ends of a DC power supply; a first control circuit to alternately turn on and off the switching elements in response to a constant oscillation frequency signal; a series circuit including a primary winding of a transformer and a capacitor connected together in series, and being connected to a connecting point between the switching elements, and to an end of the DC power supply; a rectifying/smoothing circuit to rectify and smooth a voltage in a secondary winding of the transformer thereby to output a DC voltage; a control switching element connected to two ends of the primary or secondary winding of the transformer; and a second control circuit to control the DC voltage at a predetermined voltage by turning on and off the control switching element. | 01-13-2011 |
20110051465 | RESONANT SWITCHING POWER SUPPLY DEVICE - Provided is a technique of making the leakage inductance of a transformer serve as a current resonant reactor and connecting a stray capacitance Cf | 03-03-2011 |
20120033451 | CONVERTER - A converter includes a rectifying circuit of an AC voltage of an AC power source into a rectified voltage, an input smoothing capacitor Ci, a first series circuit connected to the input smoothing capacitor and including a first and a second switching elements, a second series circuit connected to a connection point of the first and second switching elements and a first end of the input smoothing capacitor and including a primary winding of a transformer and a first capacitor Cri, a controller to alternately turn on/off the first and second switching elements, a rectifying-smoothing circuit (D | 02-09-2012 |
20120139512 | DC-DC CONVERTER - The present invention provides a DC-DC converter including: a first series circuit which is connected to the two ends of a direct-current power source Vi, and in which a first switching element Q | 06-07-2012 |