| 摘要 |
PROBLEM TO BE SOLVED: To provide the structure of a bridge circuit in which a serge voltage can be reduces, and any high breakdown strength switch, snubber circuit, and driver speed slowing circuit car not required. SOLUTION: Currents supplied from a wiring board 57 are allowed to flow through an aluminum board 55 to a switch 43'. At that time, a groove 56 is formed on the aluminum board 55, and the currents flowing through the aluminum board 55 are allowed to flow along the groove 56 in the aluminum board 55 downward, and then flow to an opposite direction to the direction of currents flowing through a switch 43'. Therefore, the currents are allowed to flow through the aluminum board 55 to the opposite direction to the direction of the currents flowing through the switch 43', and the generation of any inductance can be reduced. Also, a groove 69 is formed on an aluminum board 61, and currents flowing through the aluminum board 61 are allowed to flow along the groove 69 in the aluminum board 61 downward, and then flow to the opposite direction to the direction of currents flowing through a switch 44'. Therefore, the currents are allowed to flow through the aluminum board 61 to the opposite direction to the direction of the currents flowing through the switch 44', and the generation of any inductance can be reduced. |
