A bipolarDC PWM reversible speed-adjusting system is constituted by 80c196 single chip computer for elevator door machine.
以80c196单片机为核心，构成双极式直流pwm电梯门机可逆调速系统。
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Working in a 600v DC power supply system, the type ZDB battery charger USES new power electronic insulated-gate bipolar transistors (IGBT) as switching device and adopts PWM control technics.