Driving control method and circuit of power tube

The invention discloses a driving control method of a power tube, which is applied to a push-pull converter. The driving control circuit of the power tube comprises a driving module, a sampling and transmitting module, an error amplifying module and a dead time adjusting module. According to the invention, the actual conduction time of the two power tubes is directly sampled in a time-sharing manner by adopting a symmetric compensation technology to obtain the difference of the actual conduction time of the two power tubes so as to adjust the internal dead time. According to the invention, thedead time of one power tube in the next period is adjusted by converting the conduction time into the voltage, so that the actual conduction time of the two power tubes tends to be consistent, and the symmetry of output ripples is improved. 本发明公开了一种功率管的驱动控制方法，应用于推挽式变换器。本发明的功率管的驱动控制电路包括驱动模块、采样和传输模块、误差放大模块、死区时间调节模块。本申请的发明构思为通过采用对称补偿技术，直接分时采样两个功率管的实际导通时间，得到两路功率管的实际导通时间的差异，来调节内部死区时间。本发明通过将导通时间转化为电压来调节其中一个功率管在下一周期的死区时间，使得两路功率