Ultrasonic Atomizing Sheet Full-Wave Circuit for Efficient Drive
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Solution Overview
Problem
Existing ultrasonic atomizing sheet drive circuits, both half-wave and full-wave, suffer from low efficiency, high boost module requirements, high loss, and reliability issues, with half-wave circuits having 50% effective drive time and full-wave circuits being difficult to debug due to complementary signal mismatches.
Innovation Solution
A full-wave drive circuit for ultrasonic atomizing sheets that converts a voltage signal into a full-wave oscillation using a resonance circuit and NMOS transistor, reducing boost module requirements and using a single PWM signal for efficient, continuous sine wave generation, thereby eliminating waveform overlap and lag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a half-wave drive circuit is used, then the circuit structure is simple, but the effective drive time is only 50% of the drive cycle resulting in low drive efficiency
Solution Approach 1:
The drive circuit is segmented into two independent push-pull drive channels, each capable of generating half-wave oscillations independently. By controlling two NMOS transistors (Q1 and Q2) separately with independent PWM signals, the circuit achieves full-wave oscillation through the combination of both channels, effectively doubling the drive efficiency while maintaining structural simplicity
Solution Approach 2:
Two half-wave drive channels are merged into a single full-wave drive system. The resonance circuit combines the outputs of both push-pull channels, where L1 and L2 are connected in parallel with the ultrasonic atomizing sheet, creating a complete full-wave oscillation that provides 100% effective drive time
2Power
If the boost module provides high and stable drive voltage to improve atomizing power, then the atomizing power increases, but the loss of the boost module increases and power conversion efficiency decreases
Solution Approach 1:
The full-wave oscillation provides continuous useful action throughout the entire drive cycle, eliminating the 50% idle time inherent in half-wave circuits. This continuity allows the ultrasonic atomizing sheet to receive constant energy input, achieving high atomizing power without requiring excessive voltage from the boost module, thereby reducing boost module loss and improving overall power conversion efficiency
Solution Approach 2:
The circuit changes the operational parameters by switching from half-wave to full-wave oscillation, which doubles the effective drive time and changes the RMS voltage delivery to the ultrasonic atomizing sheet. This parameter change allows the system to achieve the same atomizing power at lower boost module output requirements, reducing energy loss
3Productivity
If a full-wave drive circuit with two complementary PWM signals is used, then the drive efficiency improves, but the debugging becomes troublesome due to signal mismatch issues
Solution Approach 1:
The circuit incorporates self-service mechanisms through automatic current collection and feedback. The current collection circuit automatically monitors the working current and feeds it back to the microprocessor, which then automatically adjusts the PWM duty cycles of both channels to maintain balanced operation, eliminating the need for manual debugging of signal mismatches
Solution Approach 2:
The circuit implements feedback control where the working current is collected through resistors R4 and R5 and capacitor C3, then fed back to the microprocessor input. The microprocessor uses this feedback information to dynamically adjust the PWM signals for both Q1 and Q2, ensuring they remain synchronized and balanced without requiring manual intervention during debugging
4Productivity
If two NMOS transistors are used in parallel full-wave drive, then the drive efficiency improves, but the device complexity and cost increase
Solution Approach 1:
Both NMOS transistors Q1 and Q2 are designed with identical circuit configurations and component values, making them universal interchangeable units. Each transistor serves dual purposes: driving its respective half of the full-wave cycle and providing current sensing through its source resistor. This universality simplifies the overall design and reduces complexity despite using multiple active components
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
The solution achieves 100% effective drive time with high efficiency and reliability, reducing boost module loss and cost while ensuring stable atomizing power and improved atomization effect.
Implementation Method 1
the resonance circuit is configured to convert, on the basis of the NMOS transistor, a voltage signal output by the high-frequency square wave generation circuit into a full-wave oscillation signal
Implementation Method 2
drive the ultrasonic atomizing sheet to perform full-wave oscillation
Data Source
AI summary
Disclosed are a full-wave drive circuit for an ultrasonic atomizing sheet and an ultrasonic electronic cigarette. In an embodiment, the ultrasonic atomizing sheet full-wave drive circuit comprises a power supply module, a microprocessor, a high-frequency square wave generation circuit, an NMOS transistor and a resonance circuit configured to convert, on the basis of the NMOS transistor, a voltage signal outputted by the high-frequency square wave generation circuit into a full-wave oscillation signal, so as to drive the ultrasonic atomizing sheet to perform full-wave oscillation. A disclosed embodiment has low requirements for a boost module, low loss of the boost module, high power conversion efficiency, small volume, low loss of NMOS transistor and low cost, is easy for debugging, and has high reliability and good atomization effect.