Toyota Jidosha Kabushiki Kaisha

Kaoru Torii

Yoshiyuki Hattori

Takashi Kojima

Kazunari Yamamoto

Kosuke Kaji

Katsuya Nomura

Taiki Kato

Yoshihiro Kida

A power converter includes: two switching elements; a positive electrode conductive plate: a negative electrode conductive plate; a mid-point conductive plate; a first heat sink; and a second heat sink. The positive electrode conductive plate is connected to a high-potential terminal of a series connection of the two switching elements, and the negative electrode conductive plate is connected to a low-potential terminal of the series connection. The mid-point conductive plate is connected to a middle point of the series connection. The first heat sink faces the positive electrode conductive plate and the negative electrode conductive plate with a first isolating layer interposed therebetween, and is connected to a ground terminal. The second heat sink faces the mid-point conductive plate with a second isolating layer interposed therebetween, and is isolated from the ground terminal.

Power converter

If the capacitance of a snubber capacitor, the inductance of a coil and the magnitude of a resistor are specified such that the resonance frequency of the snubber circuit coincides with the ringing frequency of the transistor, and the impedance of the first loop at the resonance frequency becomes smaller than the impedance of the second loop at the resonance frequency, a current component due to ringing flows in the snubber circuit, and energy is consumed by the resistor. Therefore, it is possible to quickly converge ringing.

Electric power conversion device with snubber circuit

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Toyota, Japan

Kaoru Torii