CONSTANT-POWER ELECTRONIC CIGARETTE PROTECTING AGAINST DRY-HEATING AND CONTROLLING METHOD THEREOF

A constant-power electronic cigarette protecting against dry-heating and a controlling method thereof are provided. The electronic cigarette comprises a vaporization rod (1) with a heating resistor arranged therein and comprises a battery rod (2) in which a battery (4), a control circuit board (5) and an unlock switch button (6) and a starting switch are arranged. The heating resistor is a variable resistor with a resistance variable depending on a change in temperature and having a positive temperature coefficient. The control circuit board (5) is arranged with a microcontroller chip, a resistance detection unit, a constant-power output control unit, an output feedback unit, wherein the unlock switch button and the starting switch are electrically connected with the microcontroller chip. Due to the adjustment by the constant-power output control unit, the voltage value of the heating resistor changes synchronously with the resistance value of the heating resistor to make the power constant, so that the amount of vapor that is generated during heating of the cigarette liquid by means of the heating resistor may remain the same. The electronic cigarette and the controlling method thereof can monitor resistance values of the heating resistor and thus they make it possible to protect against dry-heating. Meanwhile, they provide a constant power, so that the amount of vapor can be kept unchanged.