Patent ID: 8249438

Claim:
A dryer circuit comprising: a main circuit, comprising: a power unit, comprising: a first end for providing a first predetermined voltage; and a second end for providing a second predetermined voltage; a first heating unit, comprising: a first end coupled to the first end of the power unit; and a second end; a second heating unit, comprising: a first end coupled to the first end of the power unit; and a second end; a fan motor, comprising: a first end coupled to the first end of the power unit; and a second end; a diode coupled between the second end of the second heating unit and the second end of the fan motor; and a resistor coupled between the second of the first heating unit and the second end of the fan motor; and a connection controller coupled to the second end of the first heating unit, the second end of the second heating unit, and the second end of the power unit for switching coupling of the second end of the first heating unit to the second end of the power unit and switching coupling of the second end of the second heating unit to the second end of the power unit; wherein the connection controller comprises: a first electronic switch, comprising: a first end coupled to the second end of the first heating unit; a second end coupled to the second end of the power unit; and a control end; wherein the first end of the first electronic switch is coupled to the second end of the first electronic switch when the control end of the first electronic switch receives the first predetermined voltage; a second electronic switch, comprising: a first end coupled to the second end of the second heating unit; a second end coupled to the second end of the power unit; and a control end; wherein the first end of the second electronic switch is coupled to the second end of the second electronic switch when the control end of the second electronic switch receives the first predetermined voltage; and a switching device for coupling the control end of the first electronic switch to the first end of the power unit or coupling both the control ends of the first and the second electronic switches to the first end of the power unit.