Hitachi, Ltd.

Pioneer Corporation

Takayoshi Yamamoto

Masaya Ichinose

Toru Yoshihara

Akira Bando

Shigenori Inoue

Shuji Katoh

Tomomichi Ito

Yasufumi Hayashi

Yoshio Eguchi

Osamu Sakuchi

Keiichi Yamashita

Reisuke Sato

A switching element of a power converter generates a low voltage, using a current flowing in the power converter, and supplies a power to drive itself. A switching element of a power converter for conversion from direct current into alternate current or from alternate current into direct current includes: a terminal and a terminal which are used in building the switching element itself in the power converter; a capacitor, a high-side controllable switch and a low-side controllable switch enabling outputting the voltage of the capacitor, the voltage being output between the terminal and the terminal, and a self-supply power source for supplying a power to drive the bi-directional chopper switching element itself, using a current flowing in the capacitor.

Switching element, power converter, direct current transmission system, current control device, method of controlling power converter, and method of controlling current in voltage source converter

A control apparatus for use with a voltage source converter includes legs, each of which is configured by a plurality of converter modules each having a capacitor. Each of the legs has a first terminal on a positive side and a second terminal on a negative side. The control apparatus is configured to create command pulses for operating the converter modules. The command pulses have a frequency that is a non-integer multiple of a frequency of a system voltage. The non-integer multiple may be, for example, 3.5.

Multilevel voltage source converter and method for balancing capacitors

In a music apparatus of this invention, digital data received at a digital input terminal are stored in a primary memory area on a hard disk drive . Subsequently, a music data converter performs a predetermined conversion of the digital data stored in the primary memory area to obtain digital data having a different form, and the altered data are thereafter stored in a secondary memory area on the hard disk drive

Music data compression apparatus and method

Growing community of inventors

Mito, Japan

Takayoshi Yamamoto