Over current and short circuit protection device and method for electronic cigarette

A control device for over current or short circuit protection of an electronic cigarette, comprising

• an input module,
• a heating element used to heat and further atomize liquid tobacco of the electronic cigarette,
• a microcontroller with a built-in analog-to-digital converter,
• a power supply module used to power the microcontroller and the heating element, and
• a FET with a drain-to-source internal resistance when the FET conducts;
• wherein the microcontroller is respectively coupled to said input module and said FET;
• one node of the heating element is directly connected to an anode of the power supply module, the other node of the heating element is directly connected to the drain of the FET, the source of the FET is grounded and the gate of the FET is connected to an output of the microcontroller;
• an input of the analog-to-digital converter is connected to the drain of the FET to sample an analog signal which is then converted into a digital signal by the analog-to-digital converter;
• the microcontroller is configured to turn on the FET when receiving a first input signal from the input module, to determine whether the digital signal is greater than a pre-set value which is equal to the product of the internal resistance and a predetermined overcurrent of the FET, and then to turn off the FET when the digital signal is greater than the pre-set value.