Transformerless Ultrasonic Ranging System with the Feature of Intrinsic Safety for Explosive Environment

The transformer used in the conventional ultrasonic ranging system could provide a huge instantaneous driving voltage for the generation of ultrasonic wave, which leads to the safety problem in the explosive mixture. This paper proposes a transformerless ultrasonic ranging system powered by the intrinsically safe power source and analog switches. The analysis of intrinsic characteristics of ultrasonic driving circuit is realized in normal and fault conditions. The echo-processing circuit combined with LIN bus technology is further adopted in order to improve the system stability. After the analysis of the timing diagram of ranging instruction, the evaluation experiments of ranging accuracy and ranging stability are completed. The results show that the system can realize reliable bidirectional communication between the LIN master node circuit and the ultrasonic transceiver unit, which realizes the transformerless driving. The system can realize the distance measurement within the range of 250–2700 mm, and the measurement error is less than 30 mm. The measurement fluctuation is less than 10 mm, which provides a new solution for the ultrasonic ranging system in the potentially explosive atmosphere.

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A Low-Power CMOS Microfluidic Pump Based on Travelling-Wave Electroosmosis for Diluted Serum Pumping

Scientific Reports ◽

10.1038/s41598-019-51464-7 ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 5

Author(s):

Pei-Wen Yen ◽

Shiang-Chi Lin ◽

Yi-Chun Huang ◽

Yu-Jie Huang ◽

Yi-Chung Tung ◽

...

Keyword(s):

Low Power ◽

Human Serum ◽

Low Cost ◽

Travelling Wave ◽

Driving Voltage ◽

Diagnostic Systems ◽

Lab On Chip ◽

Essential Component ◽

Driving Circuit

Abstract Microfluidic pump is an essential component in lab-on-chip applications. It is of importance to develop an active microfluidic pump with low-power and low-cost characteristics for portable and miniaturized diagnostic systems. Taking advantages of CMOS technologies, in this work, we report a low-power microfluidic pump based on travelling-wave electroosmosis (TWEO). Utilizing an integrated driving circuit, this monolithic CMOS microfluidic pump can be operated at 1.5 V driving voltage with a power consumption of 1.74 mW. The integrated driving circuit consist of a resistor-capacitor (RC) oscillator, a 90-degrees phase-shift square wave generator, and buffer amplifiers. Moreover, capabilities of the developed CMOS TWEO pump to drive diluted human serum are characterized. The flow rate of diluted human serum with dilution ratio of 1:1000 can achieve 51 μm/s. This is the first time demonstrating an in-situ CMOS-based microfluidic pump to drive the clinical diluted serum sample. As a consequence, this work demonstrates an essential component of CMOS biotechnologies for potential applications of portable in vitro diagnosis (IVD) systems.

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Study on Driving Technology of Piezoelectric Solid-State Micro Gyroscope

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.278-280.817 ◽

2013 ◽

Vol 278-280 ◽

pp. 817-820

Author(s):

Yong Song He ◽

Xiao Sheng Wu ◽

Fu Zheng ◽

Wen Yuan Chen ◽

Wei Ping Zhang ◽

...

Keyword(s):

Solid State ◽

Resonance Frequency ◽

Closed Loop ◽

Phase Lock Loop ◽

Open Loop ◽

Reference Voltage ◽

Driving Voltage ◽

Noise Compensation ◽

Piezoelectric Solid ◽

Driving Circuit

In order to compensate the noise brought by piezoelectric gyroscope or external environment and track the resonance frequency, Closed Loop Driving Circuit (CLDC) of piezoelectric solid-state micro gyroscope is proposted in the paper which will stabilize the driving voltage value and keep the resonance frequency tracked. CLDC mainly contains Phase Lock Loop (PLL) circuit, Automatic Gain Circuit (AGC). Experimental results show that the fluctuation of reference voltage is within ±7mv, while the fluctuation of reference voltage in Open Loop Driving Circuit (OLDC) without noise compensation is ±23mv. The frequency of CLDC drifts within 0.03 kHz with the resonance frequency of 357.9 kHz while the OLDC can’t track any drifting.

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Development of a Multi-Quantum-Well Spatial Light Modulator and its Nonlinear Electro-Optical Driving Circuit

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.156-157.1 ◽

2010 ◽

Vol 156-157 ◽

pp. 1-5

Author(s):

Lan Wu

Keyword(s):

Quantum Well ◽

Spatial Light Modulator ◽

Room Temperature ◽

Flip Chip ◽

Driving Voltage ◽

Test Results ◽

Light Modulator ◽

Voltage Swing ◽

Driving Circuit ◽

Multi Quantum Well

A Multi-quantum-well (MQW) spatial light modulator (SLM) was developed and tested. The test results shows that CR could reach 1.7,the swing of driving voltage is 1.5 under the conditions of room temperature while the wavelength is 847.6nm,and the CR could reach 5.1,the swing of driving voltage is 3.2 under the conditions of the temperature of -15.4oC while the wavelength is 846nm. A programmable driving circuit is also developed to aim at this SLM. The chip of this driving circuit, with 64×64 array, adopted the 0.35µm CMOS technique. The test results show that, the resolution of driving voltage is alterable and could up to 256-level with only 65*65µm2 pixel estate. The driving voltage swing is from 0 to VDD. It could be flip-chip bounded with Multi-quantum-well (MQW) spatial light modulator (SLM). The driving circuit meets all the requirements of the Multi-quantum-well (MQW) spatial light modulator (SLM).

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Mixed Mode Driving Circuit of Quartz Gyroscope Interface Circuit

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.609-610.977 ◽

2014 ◽

Vol 609-610 ◽

pp. 977-981

Author(s):

Yu Feng Zhou ◽

Yang Li ◽

Zhen Ma ◽

Xiao Wei Liu

Keyword(s):

Mixed Mode ◽

Sine Wave ◽

Driving Voltage ◽

Distortion Factor ◽

Interface Circuit ◽

Square Wave ◽

Proper Functioning ◽

Simulation Results ◽

Driving Circuit

QRS is widely used in many areas and the driving voltage is the key to the proper functioning of QRS. In this paper, a new mixmode driving circuit is presented.The circuit uses both square wave and sine wave to drive QRS which can adopt their good points and avoid their shortcomings. The simulation results show that in this circuit, the oscillation is stabilized within 8ms and the range of frequency is 11.68kHz ~11.69kHz. The distortion factor of the driving circuit is 3.22% which makes the circuit much more satisfying.

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Study on Displacement Self-Sensing of Piezoelectric Actuator

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.339.240 ◽

2007 ◽

Vol 339 ◽

pp. 240-245 ◽

Cited By ~ 3

Author(s):

Y.G. Cui ◽

Wei Jie Dong ◽

C.Y. Gao ◽

Q.Y. Zeng ◽

Bao Yuan Sun

Keyword(s):

Integrated Circuit ◽

Piezoelectric Ceramic ◽

Integrate Circuit ◽

Wave Form ◽

Driving Voltage ◽

Free Charge ◽

Displacement Signal ◽

Voltage Frequency ◽

Driving Circuit ◽

Displacement Information

This paper aims to make piezoelectric ceramic actuator self-sense its own displacement in the absence of independent sensor. It is derived from the basic piezoelectric equation that the free charge on the wafer of piezoelectric ceramic actuator contains displacement information. So a displacement self-sensing method based on integrate circuit is presented. Voltage driving circuit for the piezoelectric ceramic actuator and integrated circuit for gathering free charge are designed. Based on the proposed compound circuits, the actuator can sense its own displacement while actuation. It is convenient to adjust the circuit and easy to acquire sensitive signal by using this method, and the impedance mismatching problem met in bridge method is overcome. The experimental results show that piezoelectric self-sensing actuator can effectively measure its displacement signal under the conditions of different wave form of driving voltage and different driving voltage frequency.

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