DIODE, SEMICONDUCTOR MODULE AND POWER CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a diode which can inhibit a surge voltage and an EMI noise; and provide a power circuit which operates at high speed and with low loss while achieving downsizing by using the diode.SOLUTION: In a diode, a capacitor structure area in which a dielectric is included is formed in a rectifier area of the diode. A low-concentration player is formed under the dielectric so as to exhibit characteristics in which capacity of a capacitor becomes lower with the increase of a voltage when a low-voltage is applied and exhibit characteristics in which capacity degradation of the capacitor is saturated when a high-voltage such as a power source voltage is applied. A ratio between an area of a capacitor structure region and an area of a rectifier region and a thickness of a dielectric film are adjusted so as to obtain predetermined characteristics.