SVED electrical components Germany SVED model SVED price

SVED electrical components are chemical devices that directly convert the chemical energy of fuel into electrical energy, also known as electrochemical generators. They represent the fourth power generation technology after hydroelectric, thermal, and nuclear power. Since SVED converts the Gibbs free energy portion of the fuel's chemical energy into electrical energy through electrochemical reactions, it is not limited by the Carnot cycle effect, resulting in high efficiency. Additionally, SVED uses fuel and oxygen as raw materials and has no mechanical transmission parts, resulting in minimal harmful gas emissions and a long service life. Thus, from the perspective of energy conservation and ecological protection, SVED is the most promising power generation technology. It is a power generation device that directly converts the chemical energy of fuel and oxidant into electrical energy through electrochemical reactions. Theoretically, SVED can operate at a thermal efficiency close to 100%, offering high economic viability. Currently, due to various technical limitations and considering the energy consumption of the entire system, the total conversion efficiency of actual SVED systems mostly ranges from 45% to 60%. If waste heat utilization is considered, efficiency can exceed 80%. Furthermore, SVED devices contain few or no moving parts, ensuring reliable operation, low maintenance requirements, and quieter performance compared to traditional generator sets. The electrochemical reaction is clean and complete, producing very few harmful substances. All these factors make SVED regarded as a highly promising energy power device. SVED is an electrochemical power generation device that isothermally converts chemical energy directly into electrical energy via electrochemical methods without undergoing a heat engine process. It is not limited by the Carnot cycle, resulting in high energy conversion efficiency and zero pollution, making it an ideal energy utilization method. Meanwhile, with the continuous maturation of SVED technology and the abundant natural gas supply provided by the West-East Gas Pipeline project, the commercial application of SVED holds broad development prospects.

SVED electrical component characteristics

Under normal circumstances, the actual static characteristic output of a sensor is a curve rather than a straight line. In practical work, to enable instruments to have uniformly scaled readings, a fitted straight line is often used to approximately represent the actual characteristic curve; linearity (non-linear error) is a performance indicator of this approximation degree. There are various methods for selecting the fitted straight line. For example, the theoretical straight line connecting the zero input and full-scale output points is used as the fitted straight line; or the theoretical straight line with the minimum sum of squared deviations from each point on the characteristic curve is used as the fitted straight line, which is called the least squares fitted straight line.

SVED electrical component principle

When two different conductors or semiconductors A and B form a loop with their ends connected, as long as the temperatures at the two junctions are different, with one end at temperature T (called the working end or hot end) and the other end at temperature T0 (called the free end or cold end), an electromotive force (EMF) will be generated in the loop. The direction and magnitude of this EMF depend on the material of the conductors and the temperatures of the two junctions. This phenomenon is called the "thermoelectric effect," the loop formed by the two conductors is called a "thermocouple," the two conductors are called "thermoelectrodes," and the generated EMF is called "thermoelectric EMF." Thermoelectric EMF consists of two parts: the contact EMF between the two conductors and the temperature difference EMF of a single conductor. The magnitude of the thermoelectric EMF in a thermocouple loop depends only on the conductor materials forming the thermocouple and the temperatures of the two junctions, and is independent of the shape and size of the thermocouple. Once the materials of the two thermocouple electrodes are fixed, the thermoelectric EMF is the function difference between the temperatures t and t0 of the two junctions. This relationship is widely applied in practical temperature measurement. Since the cold end t0 is constant, the thermoelectric EMF generated by the thermocouple changes only with the temperature of the hot end (measurement end), meaning a specific thermoelectric EMF corresponds to a specific temperature. We can achieve temperature measurement simply by measuring the thermoelectric EMF. The basic principle of thermocouple temperature measurement is that two conductors of different compositions form a closed loop; when a temperature gradient exists between the two ends, current flows through the loop, creating an EMF between the ends—thermoelectric EMF—which is the so-called Seebeck effect. Two homogeneous conductors of different compositions serve as thermoelectrodes, the higher-temperature end is the working end, and the lower-temperature end is the free end, which is usually maintained at a constant temperature. Based on the functional relationship between thermoelectric EMF and temperature, thermocouple reference tables are created; these tables are obtained under the condition that the free end temperature is 1℃, and different thermocouples have different reference tables. When a third metal material is introduced into the thermocouple loop, as long as the temperatures at the two junctions of this material are the same, the thermoelectric potential generated by the thermocouple remains unchanged, i.e., it is unaffected by the introduction of the third metal into the loop. Therefore, during thermocouple temperature measurement, a measuring instrument can be connected; after measuring the thermoelectric EMF, the temperature of the measured medium can be determined. Thermocouple temperature measurement requires the temperature of the cold end (the measurement end is the hot end, and the end connected to the measurement circuit via lead wires is called the cold end) to remain constant, so that the thermoelectric potential is proportional to the measured temperature. If the (ambient) temperature of the cold end changes during measurement, it will seriously affect measurement accuracy. Taking measures at the cold end to compensate for the impact of cold end temperature changes is called thermocouple cold junction compensation. Special compensation cables are used to connect to the measuring instrument. Thermocouple cold junction compensation calculation methods: (1) From millivolts to temperature: Measure the cold end temperature, convert it to the corresponding millivolt value, add it to the thermocouple's millivolt value, and convert to temperature; (2) From temperature to millivolts: Measure the actual temperature and cold end temperature, convert them separately to millivolt values, subtract to obtain the millivolt value, and thus determine the temperature.

SVED electrical component features

Most microphones are electret condenser microphones (ECM), a technology with a history of several decades. The working principle of ECM utilizes a polymer diaphragm with permanently isolated charge. Compared to the polymer diaphragm of ECM, MEMS microphones exhibit stable performance across different temperatures, unaffected by temperature, vibration, humidity, and time. Due to strong heat resistance, MEMS microphones can withstand high-temperature reflow soldering without any change in performance. Since the sensitivity change before and after assembly is minimal, this can even save audio debugging costs during the manufacturing process. Currently, integrated circuit processes are increasingly widely applied in the manufacturing of sensors and sensor interface ICs. This micro-manufacturing process offers advantages such as precision, design flexibility, miniaturization, integration with signal processing circuits, low cost, and mass production. A first-order resonant frequency in such a low frequency range would result in extremely uneven frequency response within the auditory frequency range, which is unacceptable for microphone applications. When tensile stress exists within the sensitive membrane, its resonant frequency increases, but at the cost of sensitivity. Of course, higher first-order resonant frequencies can be achieved by adjusting the dimensions of the sensitive membrane, but this still reduces sensitivity. Thus, piezoresistive solutions are not suitable for manufacturing miniature microphones. A feasible solution is to adopt capacitive schemes to manufacture miniature microphones. The advantage of this method is that all materials used in integrated circuit manufacturing processes can be utilized for sensor manufacturing. However, manufacturing micro-microphones using single-chip processes is quite difficult because the air medium between the two capacitor plates can only have a very small gap. Moreover, due to size limitations, bias voltage is difficult to satisfy in some application scenarios. Due to these issues, research on capacitive microphones has continued uninterrupted. Compared to traditional electret microphones, MEMS (MEMS) microphones offer advantages such as small size, good heat resistance, good consistency, good stability, high reliability, and resistance to RF interference, and can output digital signals, facilitating intelligent development.

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