Mitsubishi Denki Kabushiki Kaisha

Renesas Technology Corp.

Akira Ohmichi

Hiroyuki Inoue

Hideki Miyake

Keisuke Kawakita

Keiichiro Numakura

A drive circuit includes a totem-pole output stage including a top arm and a bottom arm, a pre-drive circuit including a top arm driver and a bottom arm driver, and a power supply voltage boosting power supply circuit. The boosting power supply circuit includes a top arm driver boosting power supply circuit that boosts the top arm and a bottom arm driver boosting power supply circuit that boosts the power supply voltage and outputs a boosted voltage.

Drive circuit

A first transistor is turned on when an H-level signal is input. A power supply voltage is applied to a gate electrode of a first switching element to charge a miller capacitance of the first switching element. As a result, gate voltage of the first switching element rises gradually and the first switching element is turned on. In this manner, the first switching element is controlled so that switching speed of the first switching element decreases. During this time, a through current caused by a backward recovery current of a fly-wheel diode connected to the first switching element is reduced. When the gate voltage of the first switching element exceeds a logic inversion voltage, the first switching element is controlled so that the switching speed is increased.

Inverter device capable of reducing through current

A differential amplifier circuit has a differential amplifier circuit section for amplifying a difference voltage between an inverting input node and a non-inverting input node, and an output buffer circuit for outputting, to an output node, the amplified difference. The differential amplifier circuit section is connected to a first high potential power supply node and a first low potential power supply node, and is driven by potentials applied to the first high potential and first low potential power supply nodes. The output buffer circuit is connected to a second high potential power supply node and a second low potential power supply node, and is driven by potentials applied to the second high potential and low potential power supply nodes.

Differential amplifier circuit and load driving circuit incorporating

An amplifying circuit includes a first amplifier having a first input terminal, a second input terminal, and an output terminal for pushing an output current; a second amplifier having a first input terminal, a second input terminal, and an output terminal for pulling an output current; a circuit for detecting the output current of an operational amplifier in the second amplifier; and an offset voltage generating circuit for generating an offset voltage. In the amplifying circuit, the offset voltage is applied between the first input terminal of the first amplifier and the first input terminal of the second amplifier, the first input terminal of the first amplifier is connected to a first input signal terminal, the second input terminal of the first amplifier and the second input terminal of the second amplifier are connected to the second input signal terminal, and the output terminal of the first amplifier and the output terminal of the second amplifier are connected to each other, and the amplifying circuit supplies an output current from the connecting point. The amplifying circuit reduces the power consumption caused by the offset voltage of an operational amplifier and a relative error of the resistance value of resistors used in the circuit when no signal is input, and reduces the cross-over distortion of an output signal.

Growing community of inventors

Tokyo, Japan

Akira Ohmichi