| 摘要 |
A circuit for controlling a motor of a power toothbrush operated by several steps is provided to improve a speed selecting function of the motor in the power toothbrush. A circuit for controlling a motor of a power toothbrush operated by several steps includes a MCU, a DC-DC converter, a MOSFET, and a plurality of resisters. The MCU, the DC-DC converter, and the MOSFET are used in the circuit. The plurality of resisters are used in an output side of the circuit. Output voltage rate is feedback to a measuring converter so as to output many kinds of voltage according to the number of clicks. When the MCU turns on by a first click, a signal OUT1 drives the DC-DC converter. The output voltage is set by a feedback signal of the voltage rate between resister R2 and R3. On a second click, a signal OUT2 lets a R3 ground. On a third click, a signal OUT3 has a R4 ground. The output voltage in the converter increases as voltage applied to a FB is decreased. |
