Patent ID: 7064518

Claim:
A driving circuit of all AC fan motor, comprising: an AC to DC converter having a rectifier having an AC power input and a DC power output and converting AC power to DC power; and a filter connected to the DC power output to output high voltage DC power; a regulated voltage divider connected to the filter to obtain low voltage DC power and having a large resistor connected to high voltage DC power and the filter; a node connected to the large resistor; and a zener diode having a breakdown voltage, connected between the node and ground and operating at the breakdown voltage; a motor driving unit connected to the regulated voltage divider to obtain the low voltage DC power, and having: two transistors, each transistor having a collector terminal, an emitter terminal and base terminal; a driving IC having a low voltage DC input connected to the node in the regulated voltage divider; two Hall signal inputs; and two controlling outputs connected respectively to the base terminals of the transistors to alternately turn the transistors on and off; and a Hall sensor connected to the Hall signal inputs of the driving IC and having a low voltage DC input connected to the node in the regulated voltage divider; windings having a first winding and a second winding connected to the high voltage DC power, the filter and respectively to the collector terminals of the transistors, and each winding having multiple coils; and a harmonic wave suppression unit connected to the high voltage DC power in parallel with the windings comprising two diodes, each diode having a negative terminal; and a positive terminal connected to the collector terminal of a corresponding transistor in the motor driving unit; and a zener diode having a negative terminal connected to the negative terminals of the two diodes; and a positive terminal connected to the high voltage DC power and the filter to obtain the DC power source with high voltage.