Patent application number | Description | Published |
20090184698 | Switching power supply - A switching power supply exhibits high conversion efficiency and facilitates reducing the size thereof. The switching power supply includes a half-bridge circuit including a first series circuit formed of switching devices Q | 07-23-2009 |
20090237050 | Switching power supply - A switching power supply, which operates intermittently under a light load for suppressing electric power consumption, reduces output voltage variations caused when a load current increases rapidly from a light load state, and reduces output voltage ringing. The switching power supply includes a comparator that compares a feedback signal obtained by isolating the output from an error amplifier with a burst threshold value and a comparator that compares the feedback signal with a power-supply-interruption threshold value preset to be lower than the burst threshold value. The switching power supply stops output of a driving pulse from a driver circuit when the feedback signal is lower than the burst threshold value. The switching power supply also stops the output of operation power from first power supply circuit when the feedback signal is lower than the power-supply-interruption threshold value. | 09-24-2009 |
20090244943 | Power Converter - A power converter includes a small-sized inductor connected to an AC voltage input line for power factor correction and a filter for suppressing conduction noise. The inductor is connected to a rectifier and comprises first and second windings and that are wound on a common magnetic core and loosely coupled with each other. A leakage inductance component of the inductor functions as an energy storage element in a main conversion operation and an excitation inductance component of the inductor functions as a noise reduction element for suppressing an conduction noise caused by on-off operation of a switching element. | 10-01-2009 |
20090284991 | Switching power supply - A switching power supply includes a control circuit controlling ON and OFF of switching devices Q | 11-19-2009 |
20100110739 | Control system of a power factor correction circuit - A control system for a power factor correction circuit performs stabilized oscillation operation and suppresses switching frequency variation due to change of the AC power source. A control system includes a voltage error amplifier for outputting a voltage error signal obtained by amplifying a difference between a DC output voltage Vo and a command value Vref of the DC output voltage, a current command value generating circuit for outputting a current command value Vi for controlling the input current Iin, a comparator comparing an inductor current signal obtained by detecting an inductor current running in the switching element by a current detecting resistor with a magnitude of the output signal Vi from the multiplier, a timer circuit for setting an off-period of the switching element corresponding to the voltage Vd, and a reset-set type flip-flop circuit for setting an off-timing of the switching element after an elapse of the off-period. | 05-06-2010 |
20100309699 | POWER FACTOR CORRECTION CIRCUIT - A power factor correction circuit includes a filter capacitor interposed between AC input terminals, a first inductor interposed between the first end of the filter capacitor and an input of a first rectifying bridge circuit, and a second inductor interposed between the second end of the filter capacitor and another input of the first rectifying bridge circuit. The power factor correction circuit further includes a second rectifying bridge circuit including inputs connected to AC input terminals, and outputs connected to a smoothing capacitor. A control circuit controls switching devices in the first rectifying bridge circuit. The power factor correction circuit can facilitate preventing an overcurrent from flowing through diodes and parasitic diodes in the switching devices, using a simple configuration. | 12-09-2010 |
20120313646 | CURRENT ESTIMATION CIRCUIT - To provide a current estimation circuit that can achieve a reduction in cost, a miniaturization, and a suppression of switching loss, and estimate an inductor current with a high degree of accuracy, despite a variation in the inductance value of the inductor. A current flowing through a switching element ( | 12-13-2012 |
20130141946 | SWITCHING POWER SUPPLY DEVICE AND METHOD FOR CONTROL THEREOF - A switching power supply device and method for control thereof, including an input voltage generating unit, a transformer, an output voltage generating unit, a MOS transistor, an output voltage detecting unit, a switching control unit, and a power supply unit. The output voltage detecting unit detects a transformer tertiary winding voltage, compares it with a first reference value, compares the differentiated tertiary winding voltage with a second reference value, and determines the start and end of a detection period based on the two comparisons. The output voltage detecting unit also samples and holds the voltage with two sampling pulses within the detection period, selects one of the two sampled and held voltages, and outputs the selected voltage when the detection period ends. | 06-06-2013 |
20140104890 | BI-DIRECTIONAL DC/DC CONVERTER - A bi-directional DC/DC converter comprises bridge circuits connected to DC voltage sources, an isolation transformer, an LC resonance circuit, and detection circuits for detecting voltages and currents of the DC voltage sources. A control circuit in the power flow from a first DC voltage source to a second DC voltage source changes over between fixed frequency control and frequency modulation control according to the magnitude of a control variable, and a control circuit in the power flow from a second DC voltage source to the first DC voltage source changes over between fixed frequency control and frequency modulation control according to the magnitude of another control variable. Thus, the bi-directional DC/DC converter can be applied to devices with a wide range of input and output voltages. | 04-17-2014 |
20150216077 | ELECTRONIC EQUIPMENT COOLING DEVICE AND POWER CONVERTER HAVING ELECTRONIC EQUIPMENT COOLING DEVICE - An electronic equipment cooling device is provided, which has housing in which heat-generating components are housed, and which can cool surfaces of the housing. A blower fan blows air toward the surfaces via a chamber room. An inclined flat plate-like partition portion is provided inside the chamber room so as to distribute a desired amount of air corresponding to a heat generating ratio of the respective surfaces. | 07-30-2015 |
20150216090 | COOLING DEVICE AND POWER CONVERTER HAVING COOLING DEVICE - A cooling device includes a plurality of side wall fins formed on an outer surface of a first side wall of a housing, and a plurality of bottom fins formed on a bottom surface of a bottom portion of the housing. A cover member covers the side wall fins and bottom fins from an outer side to form side wall and bottom cooling channels. A chamber is provided that forms a fluid introduction chamber in a direction facing a second side wall so as to communicate with the side wall cooling channel and the bottom cooling channel. A coolant supply device is externally attached to the chamber so as to supply a coolant to the fluid introduction chamber. The side wall fins and the bottom fins are formed in predetermined shapes to adjust an amount of the coolant in the side wall cooling channel and the bottom cooling channel. | 07-30-2015 |
20150245537 | MAGNETIC COMPONENT COOLING STRUCTURE AND POWER CONVERTER HAVING THE SAME - Provided is a cool air flow space in which cool air, that is generated by an inner fan disposed inside a housing, flows in the housing. An attachment member mounts a magnetic component on a bottom portion of the housing at a position within the cool air flow space. The attachment member includes a top plate and a pair of legs that extends downward from the top plate and that is fixed to the bottom portion. | 08-27-2015 |
20150348694 | COOLING STRUCTURE FOR MAGNETIC COMPONENT AND POWER CONVERTER PROVIDED THEREWITH - A cooling structure for cooling a magnetic component, includes a housing adapted to house the magnetic component; a cold air flow path space arranged in the housing for a cold air to flow therethrough; an internal fan disposed inside the housing for flowing the cold air; and an attachment member adapted to fix the magnetic component mounted on a bottom portion of the housing at a position facing a suction side of the internal fan in the cold air flow path space, so that the cold air generated on the suction side of the internal fan passes inside the magnetic component. The bottom portion of the housing mounted with the magnetic component is a cooling body. | 12-03-2015 |
Patent application number | Description | Published |
20080219033 | Switching power supply device - A switching power supply device includes a first series circuit of first and second switching elements connected in parallel with a DC power supply. An isolation transformer has primary and secondary windings and first and second auxiliary windings, a first layer including the primary windings between a second layer of the two auxiliary windings, and a third layer of the secondary windings. A capacitor in series with the primary windings defines a second series circuit in parallel with the second switching element. A rectifying and smoothing circuit includes a rectifying diode and a smoothing capacitor, connected to the secondary windings. First and second control circuits turn on and off the first and second switching elements based on voltages generated in the two auxiliary windings, to obtain a DC output from the rectifying and smoothing circuit, enabling an adequate auxiliary windings voltage and stable switching operation including stable zero-voltage turn-on. | 09-11-2008 |
20090010027 | SWITCHING POWER SUPPLY APPARATUS - A switching power supply apparatus which includes a DC power supply, an isolation transformer having primary, secondary and tertiary windings, and a switching element, and in which, by turning the switching element on and off, the high-frequency voltage appearing in the secondary windings of the isolation transformer is rectified to obtain a DC output, power consumption can be decreased during standby (in burst mode) in particular by means of a control circuit which controls the turn-on and turn-off of the element and similar. | 01-08-2009 |
20090027927 | Switch mode power supply - A switch mode power supply according to the invention that can improve the reliability thereof includes a series circuit connected between the positive and negative electrodes of a DC power supply | 01-29-2009 |
20130141947 | SWITCHING POWER SUPPLY - A flyback type switching power supply includes between P and N of a direct current output a sudden load change detector circuit, which normally has no power consumption, that detects only a transient fluctuation of a direct current output voltage, and starts the switching of a primary side semiconductor switch when there is no load or a light load, even when the semiconductor switch is in an off state, thereby enabling the detection of the direct current output voltage in a tertiary winding, and suppressing a drop in the direct current output voltage. | 06-06-2013 |
20140043868 | SWITCHING POWER SUPPLY SYSTEM AND CONTROL CIRCUIT OF THE SWITCHING POWER SUPPLY SYSTEM - A switching power supply system includes a transformer having a primary winding, a secondary winding and a tertiary winding, a switching device inputted to the primary winding carrying out switching operation on the basis of a first control signal or a second control signal, an output voltage producing section rectifying and smoothing a voltage generated in the secondary winding to produce an output voltage, an output voltage detecting section producing an output voltage detection signal based on a voltage generated in the tertiary winding, a checking pulse generator generating pulses of the first control signal, and a switching controlling section producing the second control signal on the basis of the output voltage detection signal. The switching power supply system is capable of carrying out stable control of the output voltage on the secondary winding side of the transformer with a low power loss. | 02-13-2014 |
20140355313 | RESONANT DC-DC CONVERTER CONTROL DEVICE - A control device is configured to, when the direct current output voltage of a resonant DC-DC converter is of a value that exceeds the maximum value that can be output in a fixed frequency control region, there is a switch from fixed frequency control to frequency modulation control. Because of this, conduction loss and turn-off loss caused by backflow current among semiconductor switching elements of the resonant DC-DC converter are reduced, power conversion efficiency is improved, and the range of voltage that can be output by the resonant DC-DC converter is expanded. | 12-04-2014 |