| 主权项 |
1. A diode, comprising:
at least one diode element which has a plurality of N-type regions and a plurality of P-type regions, the N-type regions and the P-type regions being alternately arranged in series to form PN junctions; and an insulated substrate which has electric insulation and includes quartz glass, sapphire, or alumina ceramics, wherein the N-type regions and the P-type regions are formed on the insulated substrate, the N-type regions and the P-type regions are formed in polycrystalline silicon carbide or single-crystal silicon carbide, a Zener voltage of a unit diode including a set of the N-type region and the P-type region is between 20 V and, 28 V, the diode is connected to a secondary side of an ignition coil installed in an internal-combustion engine, and is a constant voltage diode which functions so as to prevent applying a discharge voltage exceeding the Zener voltage to a spark plug, and the discharge voltage applied to the spark plug is 32 to 38 kV in a range of operating temperature between −30° C. and 120° C. |
