PWM Buck Voltage Output Circuit for Multi-Mode E-Cigarette Lighting
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Solution Overview
Problem
Electronic cigarettes typically offer only a single method for lighting, limiting user experience and convenience.
Innovation Solution
A voltage output circuit incorporating a control chip and a buck switch chip, which outputs a pulse width modulation signal to reduce the system power supply voltage for varied lighting methods, including suction detection and touch sensing inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single sensor or button is used for lighting, then the device structure is simple, but the lighting method is single and user experience is limited
Solution Approach 1:
The control chip U6 is designed to handle multiple input types (suction detection from J3 and touch sensing from U8) and process them through a unified PWM control pathway to the buck switch chip U2, enabling the same hardware circuit to support multiple lighting methods (suction lighting, touch lighting, button lighting) without requiring separate dedicated circuits for each function
Solution Approach 2:
Multiple control inputs (suction detection signal from J3 and touch sensing signal from U8) are merged into a single control chip U6 that generates unified PWM control signals for the buck switch chip U2, consolidating what could have been separate control circuits into one integrated control pathway
2Adaptability or versatility
If voltage reduction is implemented for varied lighting methods, then lighting flexibility is improved, but power loss increases
Solution Approach 1:
The patent replaces traditional mechanical or linear voltage reduction methods with an electronic switching-based buck converter circuit controlled by PWM signals, which achieves voltage reduction through controlled switching and energy recovery rather than simple dissipation, significantly improving efficiency
Solution Approach 2:
The buck switch chip U2 uses periodic PWM switching signals from the control chip to control the switching of power transistors, creating a rhythmic on-off pattern that allows energy to be transferred and stored in inductors and capacitors during the on-period and released during the off-period, enabling efficient voltage conversion rather than continuous energy dissipation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables multiple lighting methods for electronic cigarettes, enhancing user experience and convenience by providing a flexible voltage output to the heating wire.
Implementation Method 1
a suction detection element J3, the suction detection element J3 includes a first control signal output terminal 24
Implementation Method 2
a touch sensing chip U8, the touch sensing chip U8 includes a second control signal output terminal 37
Implementation Method 3
the modulation signal output terminal 23 of the control chip U6 outputs a pulse width modulation signal to the first control terminal 27 of the buck switch chip U2
Implementation Method 4
the first channel terminal 26 and the second channel terminal 28 are controlled to be conducted, and the second channel terminal 28 outputs a driving voltage with a voltage value thereof being less than a voltage value of the system power supply voltage
Implementation Method 5
the second channel terminal 28 of the buck switch chip U2 is connected to a heating wire to output the driving voltage VOUT to drive the heating wire to generate heat
Data Source
AI summary
The disclosure provides a voltage output circuit. The voltage output circuit includes a control chip and a buck switch chip. The control chip includes a first control signal input terminal, a second control signal input terminal, and a modulation signal output terminal. The buck switch chip includes a first channel terminal, a first control terminal, and a second channel terminal. The first channel terminal receives a system power supply voltage. The first control terminal is connected to the modulation signal output terminal of the control chip. When the first control signal input terminal and/or the second control signal input terminal receives an effective level, the control chip controls the second channel terminal to output a driving voltage.