Qin Qin

Bio: Qin Qin is an academic researcher. The author has contributed to research in topics: Thermoelectric cooling & Torque. The author has an hindex of 1, co-authored 1 publications receiving 14 citations.

Temperature Control of Thermoelectric Cooler Based on Adaptive NN-PID

Abstract: Thermoelectric cooler has dynamic thermoelectric performance under complex environment. A dynamic model of thermoelectric cooler is derived using small-signal linearization method. It shows that the dynamic model of the thermoelectric cooler has one zero and two poles. The dynamic model of thermoelectric cooler is shown to vary with different operating condition. Based on average linear dynamic model of a thermoelectric cooler, a temperature control system is designed for the cold end temperature of the thermoelectric cooler using adaptive NN-PID algorithm. The step response tests show that the controller has satisfying dynamic and steady performance. In room temperature environment, the response time for cooling down 10_ is around 70s and the steady error is very small. The cold-end temperature can be maintained at the setting value within 0.1_. Experiment results also show that the setting temperature can reach to 23_ below the environment temperature. The smaller setting value is, the longer step response is.

High Performance Thermoelectric Materials: Progress and Their Applications

Abstract: Thermoelectric (TE) materials have the capability of converting heat into electricity, which can improve fuel efficiency, as well as providing robust alternative energy supply in multiple applications by collecting wasted heat, and therefore, assisting in finding new energy solutions. In order to construct high performance TE devices, superior TE materials have to be targeted via various strategies. The development of high performance TE devices can broaden the market of TE application and eventually boost the enthusiasm of TE material research. This review focuses on major novel strategies to achieve high-performance TE materials and their applications. Manipulating the carrier concentration and band structures of materials are effective in optimizing the electrical transport properties, while nanostructure engineering and defect engineering can greatly reduce the thermal conductivity approaching the amorphous limit. Currently, TE devices are utilized to generate power in remote missions, solar-thermal systems, implantable or/wearable devices, the automotive industry, and many other fields; they are also serving as temperature sensors and controllers or even gas sensors. The future tendency is to synergistically optimize and integrate all the effective factors to further improve the TE performance, so that highly efficient TE materials and devices can be more beneficial to daily lives.

Design and development of controller for Thermoelectric cooler system

Abstract: The Thermoelectric cooler (TEC) is widely known device which have low coefficient of performance (COP) as compare to the conventional compressed refrigerator. However, it is suitable for portable refrigeration that requires light weight, small and fast control. Therefore, the proportional integral derivatives (PID) control was implemented to control input and output while reducing its power consumption. Mathematical model for TEC was develop base on black box model to get its transfer function. The transfer function consist of ratio output and input that been used for analysis during development of controller. This study is focus on performance of PID controller in simulation and real hardware in order to reduce time constrain. The method proposed is integral of time multiplied absolute value of error (ITAE) criteria to determine the coefficient of PID controller. The finding shows that the lowest temperature is 7 °C and the time taken is around 940 second.

Design and control of a thermal device for bone cement injection

Abstract: This paper presents an original robotized system that reduces potential bone cement leakage during vertebroplasty procedures while providing a longer injection time to radiologists. The system design meets the requirements of vertebroplasty procedures in terms of injection speed, consumables and medical environment. Our contribution relies on the design, dimensioning and control of a device regulating the injected cement temperature, that is one of the main factors affecting the evolution of the cement viscosity. To control the system, thermal exchanges are first modeled from the physical equations of heat and mass transfer. Then, a simple control method is presented and experimentally assessed to confirm the ability to influence the flowing cement temperature at the center of the stream within an acceptable time.

An Electronic Control Unit for Thermoelectric Cooling

Abstract: Due to their efficient operation in small volumes, Thermoelectric Coolers (TECs) have a wide usage in cooling applications, and are preferable wherever usage of compressor-based cooling systems is hard. In this study, a control unit for thermoelectric cooling modules has been designed and implemented based on a microcontroller. The designed system allows users to specify the threshold values for thermoelectric coolers to operate on. The microcontroller drives the TEC using a pulse width modulation (PWM) technique via a MOSFET as a switching component. Adopting a PWM-based control technique makes it possible to manage the speed and energy consumption of the TEC system.