Kyosan Electric Mfg. Co., Ltd.

Tadaharu Ohno

Itsuo Yuzurihara

Satoshi Aikawa

Sadao Mori

The present invention suppresses unevenness of an input/output current of a full bridge circuit, which is caused due to a cross current generated by a delay operation or the like of a switching element and unevenness of a driver voltage of each switching element, and suppresses an occurrence of an erroneous operation of an amplifier of a class-D full bridge circuit. A driver device of a class-D full bridge amplifier according to the present invention sets, at the same potential in terms of DC, reference potentials on a low-voltage side of two high-side driver circuits which drive two high-side switching elements which constitute a full bridge circuit, and suppresses an occurrence of unevenness of a driver voltage of the switching elements due to a cross current which flows between the bridge circuit and the high-side driver circuits. In the configuration in which a plurality of class-D full bridge amplifiers are driven, a driver power supply is individually provided to driver circuits which drive the class-D full bridge amplifiers, and cross currents which flow between the plurality of class-D full bridge amplifiers are suppressed.

Driver device for class-d full bridge amplifier

An impedance matching device comprising a variable reactor having a main winding and control winding, wherein a generated magnet field in the core is an AC magnetic field with a magnitude exceeding a value to settle a deviation between a control target value for impedance matching and a feedback value, by changing the magnitude of the generated magnetic field by changing a control current passing through the control winding, thereby controlling inductance of the variable rector to be a predetermined value to perform impedance matching, the response delay in the impedance matching is reduced by reducing a response delay in the inductance variation of the variable reactor.

Growing community of inventors

Yokohama, Japan

Tadaharu Ohno