Tdk Corporation

Alps Electric Co., Ltd.

Tdk-Lambda Corporation

Kazuki Iwaya

Hiroshige Yanagi

Toshimasa Miyazaki

Tetsuya Sakai

Takao Mizushima

Ichiro Takayama

Masahiro Iizuka

Eiichi Takahashi

Yutaka Naito

Kinshiro Takadate

Kazu Shoji

Ryosuke Hayasaki

Natsumi Ogawa

Toshiki Murayama

Taichi Iura

A DAB converter that is capable of inhibiting a decrease in the transmission efficiency of electric power due to an individual difference of the inductance. A DAB converter including: a transformer having a primary-side winding and a secondary-side winding; a first and second full bridge circuit; a first and second capacitor; and a control unit, in which, the primary and secondary side winding is connected between a midpoint and a midpoint of the first full bridge circuit, the first capacitor is connected between two input/output terminals included in the first full bridge circuit, the second capacitor is connected between two input/output terminals included in the second full bridge circuit, and the control unit configured to adjust a phase difference between the switching of the first and second full bridge circuit based on an estimated value of an inductance of the DAB converter.

DAB converter

A converter apparatus includes: a first transformer with two windings; a first full-bridge circuit with four switches, DC input/output units connected to a first DC power supply, and AC input/output units connected via an inductor to one winding of the first transformer; a second full-bridge circuit with four switches, DC input/output units connected to a second DC power supply, and AC input/output units connected via an inductor to another winding of the first transformer; a second transformer with two windings, one being connected via an inductor to the AC input/output units of the first circuit; a third full-bridge circuit with four switches, DC input/output units connected to a third DC power supply, and AC input/output units connected via an inductor to another winding of the second transformer; and a control unit for controlling the switches to supply power between the first to third DC power supplies.

Converter apparatus

A switching power supply apparatus is provided which reduces the time of application of an input voltage to a choke to suppress a peak current flowing through switch elements when a primary or secondary voltage is 0 V (or a voltage near 0 V). A DAB converter or switching power supply apparatus performs phase control to change at least either a first conduction width or a second conduction width of pairs of diagonally-arranged switch elements, constituting a primary full bridge circuit. The first conduction width is a time width in which a pulse for driving the first switch element and a pulse for driving the fourth switch element overlap temporally. The second conduction width is a time width in which a pulse for driving the second switch element and a pulse for driving the third switch element overlap temporally.

Switching power supply apparatus

A series compensating electric power transmission system has an insulated type DC-DC converter that operates in the first through fourth quadrants, first and second DC voltage sources, and first and second power converters. In the converter, a first I/O positive terminal is connected to a first voltage source positive terminal. A first I/O negative terminal is connected to a first voltage source negative terminal. One of second I/O positive and negative terminals is connected to the first voltage source positive terminal. The other of the second I/O positive and negative terminals is connected to a second voltage source positive terminal. The first power converter converts power between the first I/O positive and negative terminals and first AC I/O terminals. The second power converter converts power between the second I/O positive and negative terminals and second AC I/O terminals. The second power converter is configured with a plurality of bidirectional switches.

Series compensating electric power transmission system

There are provided a switch driving device and a switch driving method capable of preventing a self-turn-on phenomenon. The switch driving device includes: a first signal output unit configured to output a pulsed first driving signal from a first output terminal thereof; a second signal output unit configured to output a pulsed second driving signal to a control terminal of a switching element from a second output terminal thereof; and a negative power supply generating unit configured to generate a negative voltage relative to a ground voltage and bias a low level of the second driving signal toward a negative side by the negative voltage. The negative power supply generating unit includes: a first capacitor configured to store charge by the first driving signal; and a second capacitor configured to generate the negative voltage across terminals thereof by the transfer of the charge from the first capacitor.

Switch driving device and switch driving method

A DC-to-DC converter includes a voltage converter having: a capacitance; at least one inductor configured to store energy and exchange stored energy with the capacitance; and a switching element configured to switch on and off a current flowing through the inductor and change direction of the current at each switching. The inductor includes a variable inductor whose inductance decreases with increase in the current.

DC-to-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.

Growing community of inventors

Tokyo, Japan

Kazuki Iwaya