An electronic cigarette control system

Abstract

The invention discloses an electronic cigarette control system, which includes a DC power supply, an MCU, a switch control module, a reverse isolation module, and a capacitor. The reverse isolation module is connected between the DC power supply and the switch control module; The integrated control system of the switch control module, MCU, and reverse isolation module can not only reduce the number of connecting wires between the MCU and the switch control module, but also directly provide the input equivalent to the voltage signal for the MCU, so that the MCU does not need to add an additional comparator The corresponding pressure difference can be directly detected; since the switch control module does not need a built-in constant current source, it only needs to control the on-off between the VDD terminal and the SN terminal of the switch control module through the opening or closing of the airflow detection switch, thereby optimizing The design of the switch control module is improved; the connecting wires between the switch control module and the MCU of the system are reduced to two, and a smaller package can be used, which reduces the area of ​​the entire PCB, effectively reduces the cost, and has a very high marketing value.

Description

technical field [0001] The invention relates to an electronic cigarette, in particular to an electronic cigarette control system. Background technique [0002] At present, there are mainly two methods for the connection between the switch control and the MCU in the electronic cigarette control system: the first method is as follows: figure 1 As shown, the positive pole and negative pole of a DC power supply such as a rechargeable lithium battery or a storage battery are connected to the VDD terminal and the GND terminal of the MCU and the switch control module, and supply power to the MCU and the switch control module at the same time; the two ends of the DC power supply are connected to the filter capacitor C, The filter capacitor C only has a filtering function; the switch control module has a built-in constant current source, the output signal of the switch control module is connected to the GATE terminal of the MCU, and the air flow detection switch is connected to the s...

AI Technical Summary

Problems solved by technology

Although the circuit in this way is relative to the figure 1 The circuit reduces a connection line between the switch control module and the MCU module, which enables the switch control to be reduced in size, uses a smaller package, and reduces the wiring of the circuit, but it has a major drawback, the electronic cigarette The MCU is a relatively simple single-chip microcomputer. The detection of this relatively simple single-chip microcomputer is usually limited to 0-1 detection, that is, it can only detect the on-off of the DC power supply voltage value. Therefore, if you want to directly detect the GATE terminal of the MCU and The voltage difference at the GND terminal needs to ensure the voltage value of the GATE terminal of the MCU, that is, the voltage drop on the fixed value resistor R1 is equal to the voltage value of the DC power supply, but this will cause the potential between the VDD terminal and the GND terminal of the switch control module to be equal and cannot Work

Therefore, in order to detect the above-mentioned small pressure difference, an additional comparator module must be added, which increases the cost, increases the circuit area, and brings unnecessary trouble to the package.

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