Electronic Cigarette Control Chip Open and Short Circuit Protection
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Solution Overview
Problem
Conventional electronic cigarettes face issues with short-circuit and open-circuit problems during assembly, leading to potential chip damage and unstable connections between the heater strip and wires, without existing solutions for simultaneous open-circuit and short-circuit detection and protection.
Innovation Solution
The electronic cigarette incorporates a control chip with integrated open-circuit and short-circuit detecting modules, along with a control module that receives signals to shut down the device, ensuring protection against these issues and including additional features like smoking detection, charging, and display functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the control chip is directly welded onto the control circuit board and implanted into the metallic sleeve, then the assembling process is simple, but the driving end of the control chip may easily get short-circuited with the sleeve causing the chip to be instantaneously heated and may even burn up
Solution Approach 1:
The patent introduces an intermediate protective structure between the control chip and the metallic sleeve. The control chip is first welded onto a control circuit board, which then serves as an intermediary carrier before being implanted into the metallic sleeve. This intermediary structure prevents direct contact between the chip's driving end and the conductive sleeve, eliminating the short-circuit risk while maintaining assembly simplicity.
2Ease of manufacture
If the heater strip is connected to the wire in the form of welding or riveting, then the connection is direct, but these kinds of direct connection are not stable enough and easily open-circuited
Solution Approach 1:
The patent employs beforehand cushioning by designing a reinforced connection structure between the heater strip and wire. The connection is prepared with additional protective elements and stress-distribution features that prevent open-circuiting under thermal expansion and mechanical stress, thereby enhancing connection stability without complicating the manufacturing process.
3Device complexity
If no open-circuit and short-circuit detection is implemented, then the device is simpler, but there is no one electronic cigarette having a control chip capable of synchronously implementing open-circuit detecting and short-circuit detecting and carrying out protection
Solution Approach 1:
The patent merges the open-circuit detection and short-circuit detection functions into a single integrated control chip. The chip simultaneously monitors circuit conditions for both open-circuit and short-circuit scenarios, consolidating multiple protection functions into one component. This approach enhances reliability through comprehensive protection while avoiding the complexity of separate detection systems.
Data Source
AI summary
An electronic cigarette includes a control chip, the control chip includes: a driving module configured to output a current to drive the electronic cigarette to work; an open-circuit detecting module electrically connected to the driving module, and configured to sample and detect the current, and send out an open-circuit enable signal when a sampled current is less than a internal reference current; a short-circuit detecting module electrically connected to the driving module, and configured to sample and detect the current, and send out a short-circuit enable signal when the sampled current is greater than the internal reference current; and a control module electrically connected to the driving module, and configured to receive the open-circuit enable signal and the short-circuit enable signal, and send a shutdown signal to the driving module.