Airflow sensing device and electronic cigarette

Abstract

The present invention relates to the field of electronic cigarette technologies, and particularly discloses an airflow sensing device and an electronic cigarette. The airflow sensing device includes: an airflow sensor configured to output a capacitance value according to a detected airflow magnitude; a first oscillation unit provided with an internal capacitor and configured to output a first oscillation signal and send the first oscillation signal to a frequency divider; the frequency divider configured to divide a frequency of the first oscillation signal to obtain a frequency-divided signal; a second oscillation unit externally connected with a measuring capacitor and configured to convert the capacitance value into a second oscillation signal and send the second oscillation signal to a counter; the counter configured to count the second oscillation signal according to the frequency-divided signal and output a count signal; and an encoder configured to perform operation and encoding on the count signal and output target data; the target data including an initial value and a difference value between the initial value and a real-time value.

1 . An airflow sensing device, comprising:
 an airflow sensor configured to output a capacitance value according to a detected airflow magnitude;   a first oscillation unit provided with an internal capacitor and configured to output a first oscillation signal and send the first oscillation signal to a frequency divider;   the frequency divider configured to divide a frequency of the first oscillation signal to obtain a frequency-divided signal;   a second oscillation unit externally connected with a measuring capacitor and configured to convert the capacitance value into a second oscillation signal and send the second oscillation signal to a counter;   the counter configured to count the second oscillation signal according to the frequency-divided signal and output a count signal; and   an encoder configured to perform operation and encoding on the count signal and output target data; the target data comprising an initial value and a difference value between the initial value and a real-time value.   
     
     
         2 . The airflow sensing device according to  claim 1 , wherein the target data is transmitted using a single line code. 
     
     
         3 . The airflow sensing device according to  claim 2 , wherein data of the single line code is represented by a fixed period pulse width. 
     
     
         4 . The airflow sensing device according to  claim 2 , wherein the single line code comprises: a pilot code, a confirmation code, a first segmentation code, a second segmentation code, and an end code. 
     
     
         5 . The airflow sensing device according to  claim 1 , wherein the initial value is a positive original code. 
     
     
         6 . The airflow sensing device according to  claim 1 , wherein a first bit of the difference value is a sign bit; when the first bit is 0, the difference value is a positive original code; when the first bit is 1, the difference value is a negative original code. 
     
     
         7 . An electronic cigarette, comprising a processor and the airflow sensing device according to  claim 1 ;
 wherein the processor: acquires a preset proportion and target data output by the airflow sensing device, the target data comprising an initial value and a difference value between the initial value and a real-time value;   determines a threshold according to the preset proportion and the initial value; and   determines output power of the electronic cigarette according to the difference value and the threshold.   
     
     
         8 . The electronic cigarette according to  claim 7 , wherein the processor: acquires an interval time of two initial values closest to a current time and a preset interval; and
 determines output power within a preset duration before a smoking state of the electronic cigarette according to the interval time and the preset interval.   
     
     
         9 . The electronic cigarette according to  claim 7 , wherein the processor sets preset sensitivity according to the initial value and the difference value. 
     
     
         10 . The electronic cigarette according to  claim 9 , wherein the processor: sets automatic starting prevention sensitivity according to a current initial value, a last initial value closest to the current initial value in time, and the difference value;
 when the difference value exceeds the automatic starting prevention sensitivity, determines that a current state of the electronic cigarette is the smoking state; and   when the difference value does not exceed the automatic starting prevention sensitivity, determines that the current state of the electronic cigarette is an automatic starting state.