Patent attributes
The power control device has three units, each having two cooling fins set in opposed positions. Every cooling fin has an SCR mounted to adjust the voltage change. One of the two opposed cooling fins has a reed and a circuit board mounted thereon, and the power supply is able to be provided to the circuit board through the cooling fin, and the reed has a first contact therein and a second contact in the opposed cooling fin. When the motor is activated or turned off, the SCR makes the voltage change smoothly. When the motor is in normal operation, the first contact of the reed is connected to the second contact, so the current will steer clear of the SCR and pass the cooling fin. The cooling fins perform as a relay during the operation period, and the overheating problem of the SCR is eliminated.
