Motor driver controller for electric bicycle

A motor driver controller for controlling a motor equipped in an electric bicycle comprising:

• a motor driver bridge operable to deliver electric power to the motor and to produce a drive current signal;
• a PWM logic control operable to control the motor drive bridge;
• a pedal assist mode select block operable to selectively pass PWM command signal generated from a voltage track-and-follow block or a pedal assist block;
• an edge detector operable to provide fixed width pulse at a frequency proportional to the rotational speed of the motor;
• said voltage track-and-follow block comprising:
• a window comparator operable to compare a target motor speed signal with a motor speed setting signal;
• an S-R latch operable to determine if motor speed setting signal is able to track the target motor speed signal and output a counter control signal;
• a cruise mode select block operable to activate or deactivate cruise mode operation;
• an up/down counter operable to increase or decrease number of counts based on the S-R latch result and a clock signal, and to produce the motor speed setting signal;
• an error amplifier operable to force the motor speed to track the motor speed setting signal;
• and
• a first comparator operable to produce a PWM command signal based on the error amplifier output and a triangular waveform.