无刷直流振动电机驱动电路设计

Design of Brushless DC Vibration Motor Driver

基于CSMC0.5μmCMOS工艺,设计了一种集成开关型霍尔传感器的无刷直流振动电机全桥驱动电路。起动时采用Full-on模式,通过缩短起动时间和增大起动电流,提高振动电机起动的可靠性。起动结束后转入正常PWM模式。仿真结果表明,该驱动电路工作在2.5-4 V电源,能对最小0.2 mV的霍尔信号放大,并能有效消除4 mV的失调电压,最大输出电流可达300 mA。

Based on CSMC＇s 0.5 μm CMOS technology,a full bridge driver circuit with switching Hall sensor was designed for brushless DC vibration motor.The circuit started with full-on mode at starting phase,and after start-up,it shifted to normal PWM mode.The start-up reliability of vibration motor was improved by reducing start-up time and increasing start-up current.Simulation results showed that,operating at 2.5 V to 4 V,the proposed driver circuit could amplify Hall signal down to 0.2 mV,cancell 4 mV of input offset voltage and output 300 mA of current.