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, a capacitor, and the capacitor is connected in parallel with the switch control module; The control system integrated with the isolation module can not only reduce the number of connecting wires between the MCU and the switch control module, but also directly provide the MCU with an input equivalent to a voltage signal, so that the MCU can directly detect the corresponding voltage difference without adding an additional comparator ; and because the switch control module does not need a built-in constant current source, but only needs to control the on-off between the VDD end and the SN end of the switch control module through the opening or closing of the airflow detection switch, thereby optimizing the design of the switch control module ; The connection between the switch control module and the MCU of the system is reduced to two, and a smaller packaging method can be used, which reduces the area of ​​the entire PCB, effectively reduces the cost, and has a very high market promotion 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, so that the switch control can be reduced in size, use a smaller package, and reduce the wiring of the circuit at the same time, but it has a major drawback, because the MCU and The switch control module is powered by the same DC power supply. In order to ensure that both can work at the same time, the voltage drop generated when the DC power supply passes through the fixed value resistor R1 should not be too large, otherwise the VDD terminal of the switch control module may be undervoltage, and the MCU detects this The MCU in the electronic cigarette 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 To directly detect the voltage difference between the GATE terminal and GND terminal of the MCU, it is necessary 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 VDD terminal and GND terminal of the switch control module to The potential between the terminals is 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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