| TDK-Lambda Corporation Patent applications |
| Patent application number | Title | Published |
|---|
| 20110310637 | DC-DC CONVERTER - A controller controls a voltage-source power converter and a current-source power converter based on a detection value of a rail voltage input to the voltage-source power converter and a detection value of a charging voltage output from the current-source power converter, at the time of charging operation. | 12-22-2011 |
| 20110310636 | DC-DC CONVERTER - A DC-DC converter includes a current-source power converter that converts direct current into alternating current; a transformer that transforms the voltage of the alternating current output from the current-source power converter; a rectifier that converts the alternating current the voltage of which has been transformed by the transformer, into direct current; and a capacitor that is connected in series with winding of the transformer on the rectifier side, and blocks a direct-current component from being applied to the transformer. | 12-22-2011 |
| 20110305852 | Electronic circuit substrate - In a method of machining an electronic circuit substrate in which a sub-substrate is attached to a main substrate, an electronic circuit substrate and a method of machining the same in which the sub-substrate can be attached to the main substrate with high degree of accuracy are provided without forming the arcuate portions at corners of the outline of the substrate and corners of an insertion hole even when a router is used for machining substrates. | 12-15-2011 |
| 20110291579 | DISCHARGE LAMP STARTING CIRCUIT AND DISCHARGE LAMP LIGHTING DEVICE - The present invention is capable of continuously applying an optimum starting waveform to a discharge lamp using a simple-enough circuit configuration. A starting circuit is connected to output terminals of an inverter, and the starting circuit outputs to a discharge lamp an output voltage Vout capable of starting the discharge lamp that is a load, upon receiving an AC power with a high frequency from the inverter at the start of the discharge lamp. Further, the starting circuit is connected to output terminals of the inverter, and comprises two windings connected to the output terminals of the inverter and serially connected to the discharge lamp; a first capacitor connected between an output terminal of the first winding and an input terminal of the second winding; and a second capacitor connected between an input terminal of the first winding and an output terminal of the second winding. | 12-01-2011 |
| 20110273257 | EDGEWISE COIL AND INDUCTOR - An edgewise coil achieves positioning of both end portions and accurate and reliable conduction with respect to a circuit board in a simple configuration, and can be downsized. The edgewise coil is usable in a conductor. The edgewise coil includes a base material and a coil member fixed at both end portions to the base material and including an external wound-wire portion placed on the base material and an internal wound-wire portion extending in the base material. | 11-10-2011 |
| 20110266043 | SUBSTRATE - It is an object of the invention to provide a substrate which allows visual confirmation of the joint state and improvement of reliability of the joint between the components and the substrate to be mounted. The substrate is configured to mount a component having a planer terminal and include a land subjected to solder joint with respect to the terminal of the component. | 11-03-2011 |
| 20110255315 | SWITCHING POWER SUPPLY DEVICE - A switching power supply device ensuring no voltage dip is caused by a sink current even if started with output voltage accumulated. When input voltage Vi is reapplied with output voltage Vo accumulated, supplying PWM signals to main switching element | 10-20-2011 |
| 20110187288 | DISCHARGE LAMP LIGHTING DEVICE - A discharge lamp lighting device capable of preventing magnetic saturation of an inductor connected with an output of an inverter. An inverter | 08-04-2011 |
| 20100259856 | Power supply control device, method for controlling power supply, program and power supply device - A power supply control device for controlling power supply to a pair of terminals to which a load is connected, comprising a voltage measuring part for measuring a voltage which has a predetermined relationship with the voltage of the pair of terminals, a short circuit detecting part for detecting whether a short circuit exists between the pair of terminals based on the measured voltage and for making power supply to the pair of terminals stop when existence of a short circuit is detected, and a constant current supplying part for supplying a constant current though the pair of terminals; wherein the short circuit detecting part is configured to detect that the previously detected short circuit is eliminated when the voltage measured by the voltage measuring part is equal to or greater than a predetermined threshold value upon supplying the constant current through the pair of terminals. | 10-14-2010 |
| 20100259270 | Method for determining cell number, cell number determination device, power supply device and program - A number of cells can be determined before control for a battery without providing cell number setting and input means. The cell number determination device comprises voltage measuring units that select an “i”th cell among cells that are connected in series and that configure a battery, and that measure a voltage value between a terminal in which the “i”th cell and an (i−1)th cell, which is in one location higher than the “i”th cell, are connected and a ground potential line, voltage comparators that determine an existence, nonexistence or normality of the cells by comparing a voltage value of an (i+1)th cell that is in one location lower than the “i”th cell with the voltage value of the “i”th cell measured by the voltage measuring units and a cell number determination unit that determines a number of assembled cells and normal cells and cell assembled locations in the battery. | 10-14-2010 |
| 20100259222 | Battery protection circuit, method for protecting battery, power supply device and program - A reusable period of a battery can be maintained for a long time by recharging while avoiding abnormal heating of the battery due to over discharge. A battery protection circuit comprises a control part that cuts off a discharge switch which is a discharge path to a load for a battery when a voltage value of the battery is equal to or less than a first threshold value, or when the voltage value of the battery is less than the first threshold value, wherein the control part cuts off a power switch as a power supply path to the control part itself when the voltage value of the battery is equal to or less than a second threshold value, or when the voltage value of the battery is less than the second threshold value which is lower than the first threshold value. | 10-14-2010 |
| 20100165664 | Gate driving circuit - A primary circuit turns on switching elements and generates energy from a direct-current power supply to a secondary circuit through a transformer. The secondary circuit charges a driven element using the energy obtained from the primary circuit through the transformer, turns on a switching element, discharges the energy accumulated in the driven element, and generates the energy in the primary circuit through the transformer. The primary circuit returns the energy obtained from the secondary circuit to the direct-current power supply. | 07-01-2010 |
| 20100114399 | DIGITAL CONTROLLER FOR CONTROLLING OUTPUT VOLTAGE UNDER LARGE VARIATIONS IN LOAD AND SUPPLY VOLTAGE - There is provided a digital controller which can reduce a variation in output voltage as compared to the conventional digital controller at the time of abrupt changes in load and in input of a power amplifier. The digital controller is built in the power amplifier for supplying an output voltage v | 05-06-2010 |
| 20100103711 | Uninterruptible power supply and method for tripping thereof - Performance failure in an uninterruptible power supply (UPS) is determined independently by itself. A selective tripping can be done within a shorter time than one cycle of an AC output. A UPS converts a DC voltage to an AC voltage and supplies the AC voltage to a load device. A UPS has a control unit conducting a failure determination by using an instantaneous value of an internal voltage and current. It is preferred that a UPS includes an inverter unit and a trip switch. The inverter unit includes a semiconductor bridge circuit generating a sinusoidal AC voltage by modulating a DC voltage with voltage instruction values, and a filter circuit inserted between the semiconductor bridge circuit and the load device. The trip switch connects and trips a connection between the inverter unit and the load device according to the failure determination of the control unit. | 04-29-2010 |
| 20100102634 | Uninterruptible power supply and method for selective tripping thereof - UPS performance failure is determined independently by itself. Selective tripping can be done within a shorter time than one cycle of an AC output. A UPS converts a DC voltage to an AC voltage and supplies the AC voltage to a load device. A UPS has a control unit identifying a resistance value of an internal resistance as an internal impedance of the UPS by using an instantaneous value of an internal voltage and current and conducting a failure determination by detecting abnormal fluctuation of the value. It is preferred that an identification of the internal impedance is done through a system identification unit. | 04-29-2010 |
