Modularized control circuit of fan motor and method of operating the same

A modularized control circuit of a fan motor providing a phase-sensing control to the fan motor;

• the modularized control circuit comprising:
• a driving circuit electrically connected to the fan motor and configured to produce a plurality of analog driving voltage signals to drive the fan motor;
• and
• a microcontroller integrated circuit electrically connected to the driving circuit, the microcontroller integrated circuit comprising:
• a phase-sensing module receiving the analog driving voltage signals and configured to sense phases of the analog driving voltage signals to produce a phase trigger signal, the phase-sensing module comprising:
• an analog selection matrix unit having a plurality of input terminals to receive the analog driving voltage signals and configured to judge a voltage system type according to the analog driving voltage signals;
• an analog filter connected to the analog selection matrix unit and configured to filter the analog driving voltage signals to produce filtered analog driving voltage signals;
• a three-phase analog comparator connected to the analog filter to receive the filtered analog driving voltage signals and configured to compare phase sequence of the filtered analog driving voltage signals and provide analog comparing voltage signals;
• a digital conversion unit connected to the three-phase analog comparator and configured to convert the analog comparing voltage signals into digital driving voltage signals;
• and
• a multiplexer connected to the digital conversion unit to receive the digital driving voltage signals and configured to produce the phase trigger signal;
• a control unit connected to the phase-sensing module to receive a speed signal and the phase trigger signal and configured to produce a control signal;
• and
• a driving signal generator connected to the control unit to receive the control signal and configured to produce at least one switch driving signal to control the driving circuit.