Hitachi, Ltd.

Takatsugu Kanbara

Hiroshi Fujii

Satoshi Ibori

Shigeyuki Baba

Takuji Torii

Hiroshi Asabuki

Kenji Nandoh

Kengo Hasegawa

Takehiko Yanagida

Naoto Suzuki

Kenji Nandou

This specification discloses an overcurrent protective circuit for detecting an overcurrent flowing through an electrostatic self-turn-off device and suppressing the overcurrent. The overcurrent protective circuit according to the present invention comprises a power source for supplying a driving voltage to the electrostatic self-turn-off device to turn on the device, a switching circuit for performing on-off control of the driving voltage to provide a driving signal to the self-turn-off device, and a circuit for detecting the voltage of the driving control terminal and holding the potential of the driving control terminal below the driving voltage in response to the detected voltage reaching a predetermined value.

Overcurrent protective circuit for electrostatic self-turn-off devices

In an inverter device comprising a main circuit section which switches a power at high speed, having a switching element and a smoothing condenser for smoothing the power supplied to the switching element, and a logic section for controlling the main circuit section, a shielding member is disposed between the main circuit section and the logical section. The shielding member includes a combination of a heat shielding member and an electromagnetic shielding member so as to protect the logic section from heat, electromagnetic noise, and vibration generated in the main circuit section for improving reliability of the inverter device.

Inverter device

Growing community of inventors

Funabashi, Japan

Takatsugu Kanbara