| 摘要 |
A motor drive circuit is provided to perform a stable switching operation of a triac to drive a motor by reducing a peak value of a voltage using a snubber when an instantaneous voltage is applied. A motor drive circuit includes a microcomputer(30), a triac gate driving unit(31), a triac(32), a voltage detector, a motor(34), and a snubber(35). The micro computer(30) is driven by a driving voltage supplied from a power source voltage(AC), controls an inputted signal by predetermined algorithm, and outputs a controlled signal. The triac gate driving unit(31) outputs a gate driving signal. The triac(32) supplies and blocks the power source voltage. The voltage detector detects a voltage flowing to the triac(32). The motor(34) rotates by an on/off driving action of the triac(32). The snubber(35) is connected to both ends of the motor(34), reduces a peak of a voltage of the triac(32), and lowers a saturated state of the motor(34) when a rapid high voltage is inputted. |
