Patent application number | Description | Published |
20110122667 | RECTIFIER CIRCUIT - A high power factor rectifier circuit, provided with switching sections connected to an AC power supply for converting an AC voltage to a DC voltage, is formed with a bypass circuit provided. The bypass circuit, when the voltage of the AC power supply becomes higher than the voltage across a smoothing capacitor provided on the DC output side, makes a charge current flowing from the AC power supply to the capacitor bypass the switching section by making the switching section out of conduction. Thus, a rectifier circuit is provided which can be safely operated without causing any damage, or with minimized damage, even though an inrush current flows at turning-on the power or at recovery from a power interruption. | 05-26-2011 |
20130170268 | POWER CONVERTER - A motor drive system wherein an LC circuit exists between an inverter and a motor is such that switching of semiconductor switching elements Su to Sw and Sx to Sz configuring the inverter is controlled by an on-signal formed of a first on-signal, a second on-signal, and an off-state period of a time the same as the first on-signal provided between the first on-signal and second on-signal, and by an off-signal formed of a first off-signal, a second off-signal, and an on-state period of a time the same as the first off-signal provided between the first off-signal and second off-signal, and surge voltage applied to an input terminal of the motor is suppressed by the time of the first on-signal and the time of the second off-signal being set to one-sixth of a resonance cycle specific to the LC circuit. | 07-04-2013 |
20130235625 | AC-AC CONVERTER - An AC-AC converter configured of a forward converter that converts alternating current to direct current and a reverse converter that converts direct current to alternating current, wherein a first semiconductor switch series circuit, a second semiconductor switch series circuit, and a capacitor series circuit are connected in parallel, a first inductor is connected between one end of an alternating current input and a series connection point of the first semiconductor switch series circuit, a bidirectional switch is connected between the one end of the alternating current input and a series connection point of the second semiconductor switch series circuit, a second inductor is connected between the series connection point of the second semiconductor switch series circuit and one end of an alternating current output, and a series connection point of the capacitor series circuit is connected to the other end of the alternating current input and the other end of the alternating current output. Because of this, it is possible to keep the inductor loss of the rectifier sufficiently small when input voltage is within a specified range. Also, in addition to this, it is possible to reduce switching loss more than in heretofore known circuits when carrying out a compensation action. | 09-12-2013 |
20140268963 | DC VOLTAGE CONVERSION CIRCUIT - Aspects of the invention relates to a DC voltage conversion circuit including: a DC power supply; a switching device which is connected to two ends of the DC power supply through an inductor, and a series circuit which is connected in parallel with the switching device and which includes a diode and a load, so that an input voltage supplied from the DC power supply can be converted into an output voltage with a predetermined magnitude by an operation of the switching device and supplied to the load. The DC voltage conversion circuit can further include: a series circuit which is connected to two ends of the diode and which includes a snubber capacitor and a snubber diode. | 09-18-2014 |
20140346877 | POWER CONVERTER - A power converter can include an inverter including, connected in series, switching elements, the inverter circuit being connected to both ends of a DC power source series circuit resulting from connecting in series a DC power source and a DC power source. Also included can be an AC output terminal that is connected to a connection point of the switching element and the switching element, an AC output terminal that is connected to a connection point of the DC power source and the DC power source, a bidirectional switch element one end of which is connected to the AC output terminal and the other end of which is connected to a terminal of an AC power source and a bidirectional switch element one end of which is connected to the AC output terminal and the other end of which is connected to the AC power source. | 11-27-2014 |
20140346884 | POWER CONVERTER - A power converter that can supply constant voltage to a load even upon fluctuation of voltage of an AC power source includes an inverter circuit resulting from connecting switching elements in series, the inverter circuit being connected to both ends of a DC power source series circuit resulting from connecting in series two DC power sources; an AC output terminal that is connected to a connection point of the switching elements; another AC output terminal that is connected to a connection point of the DC power sources; and a bidirectional switch element including one end connected to the AC output terminal U and another end connected to a terminal of an AC power source. | 11-27-2014 |
20140369100 | RECTIFIER CIRCUIT - A rectifier circuit includes an inductor connected to AC inputs of a diode bridge circuit, a capacitor series circuit connected to a DC output, and bi-directional switches that are connected between the series connection point of the capacitors and the AC inputs of the diode bridge circuit. In order to reduce the loss that would occur if both bi-directional switches were driven at high frequency, one of the bi-directional switches is driven at the frequency of the AC input voltage and the other bi-directional switch is driven at a high frequency, and also general rectifying diodes are used as the diodes connected to the bi-directional switch that is driven at the frequency of the AC input voltage and fast recovery diodes are used as the diodes connected to the bi-directional switch that is driven at high frequency. | 12-18-2014 |
20150042166 | POWER CONVERSION DEVICE - A power conversion device able to supply a constant load voltage even when the voltage of a 3-phase alternating current power supply fluctuates. A series circuit formed of switching element Q | 02-12-2015 |