Single-Switch Heating Power Converter for Longer Battery Run Time
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Solution Overview
Problem
Existing electronic heating devices, such as electronic cigarettes and scent diffusers, face challenges with high power consumption and limited portability due to the four-switch non-inverting buck-boost converter topology, which results in short battery run times and large circuitry layouts.
Innovation Solution
A single-switch power converter topology is introduced, featuring a power switch, inductor, and DC blocking capacitor, with a controller generating control signals for on-time and off-time alternation, reducing switching losses and circuit complexity, allowing for higher frequency operation and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a four-switch non-inverting buck-boost converter topology is used, then the output power can be regulated, but the battery run time is short and the circuitry layout area is large
Solution Approach 1:
The patent extracts and removes two switching devices from the conventional four-switch buck-boost converter topology, reducing the circuit to a single-switch configuration. This extraction eliminates redundant components while preserving the essential power regulation function, directly reducing switching losses and extending battery run time.
Solution Approach 2:
The patent merges multiple functions into the single-switch configuration by utilizing the inductor and capacitor in a unified power conversion topology. The single switch controls both buck and boost operations, consolidating what traditionally required four separate switches into one integrated circuit structure.
2Power
If a four-switch non-inverting buck-boost converter topology is used, then the output power can be regulated, but the circuitry layout area is large
Solution Approach 1:
The patent extracts and removes two switching devices from the conventional four-switch buck-boost converter topology, reducing the circuit to a single-switch configuration. This extraction eliminates redundant components while preserving the essential power regulation function, directly reducing switching losses and extending battery run time.
Solution Approach 2:
The patent merges multiple functions into the single-switch configuration by utilizing the inductor and capacitor in a unified power conversion topology. The single switch controls both buck and boost operations, consolidating what traditionally required four separate switches into one integrated circuit structure.
3Loss of energy
If a single-switch power converter topology is used, then the switching loss is reduced and battery run time is extended, but the response speed needs to be improved
Solution Approach 1:
The patent implements dynamic control of the single switch with adjustable switching frequencies ranging from 1 MHz to 10 MHz. The controller dynamically adjusts the switching frequency and duty cycle based on load conditions, enabling fast response while maintaining low switching losses through optimized timing parameters.
Solution Approach 2:
The patent changes the switching frequency parameter dynamically, allowing operation from 1 MHz to 10 MHz depending on the required response speed and power level. This parameter adjustment enables the system to achieve both low switching losses at lower frequencies and fast response at higher frequencies.
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
This solution extends battery run time, enhances response speed, and reduces circuit size, making the device more portable and efficient with less switching loss and simplified control schemes.
Implementation Method 1
when the power switch is switched on, the inductor is charged up with a charging current supplied by the power supply; energy generated from the power supply is transferred and stored in the inductor
Implementation Method 2
the DC-blocking capacitor is discharged through a RC circuit formed with the heating element, energy stored in the DC-blocking capacitor is transferred to the heating element to generate heating power
Implementation Method 3
when the switch is switched off, the inductor is discharged with a discharging current flowing through a LCR circuit formed with the DC-blocking capacitor and the heating element; energy stored in the inductor is transferred through the DC-blocking capacitor to the heating element to generate heating power
Data Source
AI summary
The subject application provides a portable electronic heating type device with an improved power converter topology configured for receiving a DC input voltage from the power supply and generate an AC output voltage to the heating element. The power converter is based on an inductor, a DC blocking capacitor and only one switching device. Heating power can be adjusted under a pulse-width-modulation mode, a fixed-on-time mode, a fixed-off-time mode or a frequency-modulation mode. The portable electronic heating type device has less switching loss and faster response. Therefore, it can be operated at higher frequency and more compact in size.