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Analog Technologies has a strong R&D team under the leadership of Dr. Gang Liu, a graduate of Wayne State University of Michigan. With innovation in mind, this R&D team designed and patented more than twelve products in the advanced analog technology fields. Backed with intensive trainings in higher education and enhanced experience, this R&D team is ready to work on your special requests.

Advantages and application of TEC controllers

Saturday, September 5, 2015 10:56:53 PM America/Los_Angeles

Thermoelectric cooling uses the Peltier effect to create a heat flux between the junctions of two different types of materials. A Peltier cooler, heater, or thermoelectric heat pump is a solid-state active heat pump which transfers heat from one side of the device to the other, with consumption of electrical energy, being dependent on the direction of the current. Such an instrument is known as a Peltier device, a Peltier heat pump, solid state refrigerator, or thermoelectric cooler (TEC). It can be used either for heating or for cooling, although in practice the main application is cooling. It can be invoked as a temperature controller that either heats or cools.

The TEC5V4A-D is an electronic module designed for driving TECs (Thermo-Electric Coolers) with high stability in regulating the object temperature, extreme energy efficiency.

The module provides interface components for users to configure the desired object temperature range, i.e. set-point temperature range; maximum voltage across TEC, i.e. maximum TEC voltage; and the compensation network. The compensation network compensates the astronomical order thermal load and thus stabilizes the temperature control loop.

The TEC5V4A-D comes with a high stability low noise 3.0V voltage references which can be utilized to setting the desired object temperature by using a POT (potentiometer) or a DAC (Digital to Analog Converter). When utilizing this reference for setting the set-point temperature, the set-point temperature error does not depend on this reference voltage.

 

Tag: tec controllers, tec controller

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Characteristic analysis of TEC refrigeration cycle (III)

Monday, August 31, 2015 8:32:44 PM America/Los_Angeles

From (3), (13) and (14), it is shown that when Th -Tc>△Tmax, the cooling capacity qc<0. At the same time, TEC cannot cool, but start heating, which is not allowed in practical work. So the working current should be controlled in range of I0IIsat, which can ensure the cooling capacity qc≥0. Although based on the analysis of the cooling capacity qc, the general range of working current can be determined, but in practical work, the refrigeration coefficient is still an important indicator. From (9), when the working current of TEC satisfies the following relations, the TEC can reach the maximum refrigeration coefficient βmax:

 

Where, Iopt is the working current in the condition of meeting the optimal refrigeration coefficient; Z is the figure of merit, ;.The relationship among current I, cooling capacity qc and β is shown in the figure 3. When Ish<I<0 and W<0, TEC is in the power generation mode. When I<Ish、0<I<I0 and I>Isat, the cooling capacity of TEC qc<0 and it will heat the cold load, which should be avoided as far as possible in practical work. When 0<I<Isat, the amount of heating load is small because there exists the Peltier effect reducing the impact of heat resistance in the cold end. Only when the current meetsI0<I<Isat, TEC can work normally in the cooling mode; when I=I0 or I=Isat, it cannot cool. The cooling capacity qc is a quadratic function about current I, so qc is symmetric in the two interval, I0<I<Isat and Imax<I<Isat. However, when considering that the refrigeration coefficient β increases with the current increasing in the range of I0<I<Iopt and decreases with the current increasing in the range of Iopt<I<Isat, so he refrigeration coefficient should be considered at the same time with improving cooling capacity and the working current in Imax<I<Isat is not selected in general. Obviously, TEC has two extreme ways of working, the maximum refrigeration coefficient operation mode and the maximum cooling capacity operation mode. The former is the operation mode of variable voltage and variable operating current; the latter is the operation mode of constant working voltage and working current. But in the actual work, the hot and cold end temperature of thermoelectric cooler is changing, and it generally works between the maximum refrigeration coefficient and the maximum refrigeration capacity, so the current needs to be regulatedaccording to the actual situation.

If you want to know more, please click here http://www.analogtechnologies.com/

Keywords: TEC, thermoelectric cooler

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The performances and characteristics of TEG (Ⅱ)

Wednesday, August 26, 2015 9:38:53 PM America/Los_Angeles

3. Thermoelectric materials

In the view of the research and development of thermoelectric materials, lead telluride is used as a thermoelectric material in the early days, and then TAGS alloy is developed for P-type element (N-type is still PbTe). The temperature of the hot end can be up to 600℃. After using new thermoelectric materials in hundred watt thermoelectric generator and universal thermoelectric generator, the hot end temperature can reach 1000℃ and its mechanical properties and oxidation resistance are very good. In the condition of high temperature, this material is not easy evaporated and can work in vacuum and in air.

In recent ten years, because of the need for environment protection and military application, the research of thermoelectric materials again attracts people’s attention. Currently, the dimensionless figure of merit ZT of the best bulk thermoelectric materials (BiTe) is approximately equal to 1.0. In order to complete with other energy conversion systems, ZT must be increased to 1.5~3.There are three ways: firstly, researching new materials; secondly, studying function gradient materials; thirdly, reducing the material’s dimension. 

There are many kinds of high-quality TEG in our company (ATI). We have such a professional design team and production workshop that we can be your one stop company for designing and building your TEG based on the “thermoelectric effect”. 

If you want to know more, please feel free to contact us.

Our web site is http://www.analogtechnologies.com/

Keywords: TEG, thermoelectric generator

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The performances and characteristics of TEG (I)

Wednesday, August 26, 2015 6:28:19 PM America/Los_Angeles

Based on the “thermoelectric effect”, a thermoelectric generator (TEG) converts heat directly into electricity. Because of no moving parts, it is very silent and highly reliable. 
The physical picture of TEG

1. The classification of TEG

According to the hot end temperature of TEG, it can be divided into three categories: high temperature TEG (more than 700℃), medium temperature TEG (between 400 and 700℃) and low temperature TEG (under 400℃). According to the usage heat source, there are four types of TEG: 1) radio isotope TEG, which converts the decay heat of radioactive isotopesdirectly into electricity; 2) nuclear reactor TEG, which converts the heat produced by nuclear fission into electricity; 3) hydrocarbon fuel TEG, which includes natural gas, liquefied petroleum gas and other gas TEG; 4) low heat TEG, which converts available low-grade thermal energy into electricity. 

2. The main structure of TEG

The structure of TEG mainly include the following sections: 1) heat source; 2) thermoelectric devices (including thermo electric materials); 3) electrode, which is used for connecting two different types of thermoelectric devices; 4) thermal insulation materials; 5) heat sinks; 6) radiation shielding and safety protection device; 7) voltage converting and power adjusting device. To measure the overall electrical performance index is the thermoelectric conversion efficiency, output power, output voltage, working lifetime, weight, volume, cost and reliability respectively.

The left characteristics of TEG will be introduced in the next article.

If you want to know more, please feel free to contact us.

Our web site is http://www.analogtechnologies.com/

Keywords: TEG, thermoelectric generator

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Functions of Capacitor Kits

Saturday, May 3, 2014 12:22:12 PM America/Los_Angeles

Originally recognized as a condenser, a capacitor is an electrical component, which preserves energy in an electric field. The capacitor only stores the electrons, but can’t produce them. It is comprised 2 electrical conductors separated by a dielectric, known as insulator. The conductors, the metal plates, when attached to power source build up electric charge. The two plates mount up positive as well as negative charge. The amount of electric charge stored or preserved in the capacitor at 1 volt is the capacitance.

In other words, a capacitor is characterized by the parameter capacitance. It is measured in units of F (Farad).Capacitors are of different types depending on the purpose. The capacitors that are being used widely include electrolytic, ceramic, mica, mylar and the likes.

How does it Work?

The capacitor is used for different applications depending on its types and sizes of dielectric used. There are capacitors that can be used for low voltage as well as high voltage applications. For example, tuning circuit air is extensively used as the dielectric in radio applications. For applications in timer, the dielectric is the circuit mylar. Glass is usually used for high voltage applications. For MRI and X-ray machine applications, ceramic is normally preferred.

In a capacitor, the dielectric material plays an integral part in storing and preserving the electrical energy.

Advantages of Capacitors:

Capacitors kits have a number of advantages as they can discharge within a fraction of a second. They are used in various applications that need high speed usage, such as in laser techniques and camera flash. In these applications, capacitors need to function quickly and they are capable of that. Capacitors come very handy in removing ripples by exterminating the peaks and filling in the valleys. They are further used in ACs as they allow the ac voltage to pass through and block dc voltage.

Where to Buy Capacitor Kit?

At www.analogti.com, youwill find best capacitor kits at the most pocket-friendly prices.

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