Nissan Motor Company Limited

Renault S.a.s.

Taku Shimomura

Tetsuya Hayashi

Akinori Okubo

Shigeharu Yamagami

Yuichi Iwasaki

Yusuke Zushi

Keiichiro Numakura

Toshihiro Kai

Daiki Sato

Dai Tsugawa

Tatsuhiro Suzuki

Takayuki Ikari

Keiichirou Numakura

A driving circuit applies a voltage to a switching element to switch between an ON state and an OFF state. The switching element includes a control terminal, a high-potential terminal, and a low-potential terminal, and is switched between the ON state and the OFF state depending on the voltage of the control terminal in a case in which a potential of the low-potential terminal is defined as a reference potential. The driving circuit includes a negative-voltage power supply for applying a negative voltage as the voltage to the control terminal when the switching element is switched from the ON state to the OFF state, and a voltage changing unit for changing the voltage immediately before the switching element is switched from the OFF state to the ON state to be higher than the negative voltage immediately after the switching element is switched from the ON state to the OFF state.

Driving circuit

A resonant power conversion device includes: a main circuit provided with a semiconductor switch, a capacitor and an inductor connected in series or parallel to the semiconductor switch; and a drive circuit configured to drive the switching element. The switching element enters an off-state or an on-state depending on a control voltage input to a gate terminal, and the drive circuit includes two or more types of control voltages, as a control voltage at which the switching element enters an off-state.

Resonant power conversion device

The present disclosure includes by controlling at least either one of a switching frequency of a switching element (S) or a duty ratio indicating an ON period of the switching element, securing delay time from voltage at both ends of the switching element reaches zero voltage by resonance of the resonant circuit (L, C) in an OFF state of the switching element until the switching element is turned on, and turning on the switching element within the delay time.

Method for controlling resonance-type power converter, resonance-type power converter, and DC-DC converter

The present disclosure includes a drive circuit (-) for switching a switching element, and a variable capacity circuit (A), connected between a control terminal (G) of the switching element and the drive circuit (-), capable of switching at least between a first capacity value and a second capacity value different from the first capacity value, and controls a capacity value between the control terminal and the drive circuit via the variable capacity circuit.

Switching device and method for controlling switching device

A drive device wherein a main switching element is connected to a main current path, an input terminal of the switching element on the higher potential side and an output terminal of the switching element on the lower potential side are electrically connected to a control terminal of the main switching element, a first resistance is connected between an input terminal of the switching element on the lower potential side and a control terminal of the main switching element, a first capacitor is parallelly connected to the first resistance, and a second capacitor is connected between a connection point of the first resistance and a control terminal of the main switching element and a terminal on the higher potential side of the main switching element.

Drive device

A power supply control apparatus includes a DC power supply including a positive electrode and a negative electrode, a load electrically connected to the DC power supply, a relay connected to a current path from the positive electrode to the negative electrode through the load in series, a switching device connected to the current path in series, and a controller controlling the relay and the switching device. The controller, in a case in which the current path is to be electrically cut off, switches the switching device to an Off state and then switches the relay to the Off state.

Power supply control apparatus and method thereof

A power conversion device includes a gate voltage adjustment unit (a detection circuit) which acts on a drive signal from a gate drive circuitthat sends a drive signal to the respective gates of a plurality of semiconductor elements Qto Qprovided in parallel, and which adjusts the gate voltages of the semiconductor elements. The gate voltage adjustment unit superimposes an induction voltage generated on the basis of a difference between a magnetic flux due to a current flowing through one of the plurality of semiconductor elements and a magnetic flux due to a current flowing through each of the other semiconductor elements, onto a gate voltage sent to at least one gate of the plurality of semiconductor elements.

Power conversion device with gate drive circuit

An anode regionis formed on a bottom portion of a trenchin which a gate electrodeis formed or in a drift regionimmediately under the trench. A contact holeis formed in the trenchat a depth reaching the anode region. A source electrodeis embedded in the contact holewhile interposing an inner wall insulating filmtherebetween. The anode regionand the source electrodeare electrically connected to each other in a state of being insulated from the gate electrodeby the inner wall insulating film

Growing community of inventors

Kanagawa, Japan

Taku Shimomura