PWM SIGNAL APPARATUS OF MOTOR CONTROLL SYSTEM

摘要

The PWM signals of time variant duty cycles are generated by using only two input clocks and a preset data. The signal generator comprises latches (12) keeping the time variant pulse signals which are changed by the number of rotations; a preset counter (8) counting the PWM signals; a duty ratio converting circuit (10) using the single clock to generate PWM signals. The preset counter (8) includes a reset circuit having a D flip-flop and a NOR gate; DRNC flip-flop counters having three input terminals and the three output terminals.