Semiconductor device comprising an IGBT and a constant voltage circuit having switches and normally-on type MOSFETs connected in parallel
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United States of America Patent
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Sep 16, 2014
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app pub date -
Aug 11, 2009
filing date -
Aug 11, 2008
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Abstract
A semiconductor device includes an IGBT, a constant voltage circuit, and protection Zener diodes. The IGBT makes/breaks a low-voltage current flowing in a primary coil. The constant voltage circuit and the protection Zener diodes are provided between an external gate terminal and an external collector terminal. The constant voltage circuit supplies a constant gate voltage to the IGBT to thereby set a saturation current value of the IGBT to a predetermined limiting current value. The IGBT has the saturation current value in a limiting current value range of the semiconductor device.
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