Pharos Marine electrical components German Pharos Marine models Pharos Marine prices

Pharos Marine electrical components refer to devices that convert chemical energy into electrical energy, consisting of cups, troughs, or other containers or partial spaces of composite containers holding electrolyte solutions and metal electrodes to generate current. They have distinct positive and negative poles. With technological advancements, the term battery broadly refers to small devices capable of generating electrical energy, such as solar cells. Key performance parameters of batteries include electromotive force, capacity, specific energy, and resistance. Using batteries as an energy source provides stable voltage and current, long-term stable power supply, and current minimally affected by external factors. Furthermore, batteries feature simple structures, are portable, offer easy charging and discharging operations, are unaffected by external climate and temperature, and provide stable and reliable performance, playing a significant role in various aspects of modern social life.

Pharos Marine electrical component structure

The structure and materials of new high-voltage Schottky diodes differ from those of traditional Schottky diodes. Traditional Schottky diodes are formed by metal-semiconductor contact. Metals such as aluminum, gold, molybdenum, nickel, and titanium can be used, while the semiconductor is typically silicon or gallium arsenide. Since electron mobility is higher than hole mobility, N-type semiconductor material is selected as the substrate to achieve good frequency characteristics. To reduce the junction capacitance of the Schottky diode and increase the reverse breakdown voltage without causing excessive series resistance, a high-resistance N- thin layer is usually epitaxially grown on an N+ substrate. It is well known that metal conductors contain a large number of conduction electrons. When metal contacts a semiconductor (with the distance between them on the order of atomic size), the Fermi level of the metal is lower than that of the semiconductor. At the energy levels corresponding to the conduction band of the semiconductor within the metal, the electron density is lower than that in the semiconductor's conduction band. Therefore, upon contact, electrons diffuse from the semiconductor to the metal, causing the metal to become negatively charged and the semiconductor positively charged. Since metal is an ideal conductor, the negative charge is distributed only within a surface layer of atomic thickness. For N-type semiconductors, the donor impurity atoms that lose electrons become positive ions and are distributed over a larger thickness. The diffusion of electrons from the semiconductor to the metal results in the formation of a space charge region, a built-in electric field, and a potential barrier, with the depletion layer located only on the N-type semiconductor side (the entire barrier region falls on the semiconductor side). The direction of the built-in electric field in the barrier region is from the N-type region toward the metal. As thermionic emission increases the built-in field, the drift current, which is opposite to the diffusion current, increases until dynamic equilibrium is reached, forming a contact potential barrier between the metal and the semiconductor, known as the Schottky barrier. When the external voltage is zero, the electron diffusion current equals the reverse drift current, achieving dynamic equilibrium. When forward bias is applied (positive voltage to the metal, negative voltage to the semiconductor), the built-in field is weakened, the barrier on the semiconductor side is lowered, and a forward current flows from the metal to the semiconductor. When reverse bias is applied, the built-in field is strengthened, the barrier height increases, and a small reverse current flows from the semiconductor to the metal. Therefore, like a SBD-PN junction diode, it is a nonlinear device with unidirectional conductivity.

Pharos Marine electrical component principle

When two different conductors or semiconductors, A and B, form a loop with their ends connected, an electromotive force is generated in the loop as long as the temperatures at the two junctions are different. One junction, at temperature T, is called the working end or hot end; the other, at temperature T0, is called the free end or cold end. The direction and magnitude of this electromotive force depend on the materials 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 electromotive force is called "thermoelectromotive force." Thermoelectromotive force consists of two parts: the contact electromotive force between the two conductors and the temperature difference electromotive force of a single conductor. The magnitude of the thermoelectromotive force in a thermocouple loop depends only on the conductor materials forming the thermocouple and the temperatures of the two junctions, not on the shape or dimensions of the thermocouple. Once the materials of the two thermocouple electrodes are fixed, the thermoelectromotive force is the functional difference between the temperatures t and t0 of the two junctions. This relationship is widely used in practical temperature measurement. Since the cold end t0 is constant, the thermoelectromotive force generated by the thermocouple changes only with the temperature of the hot end (measurement end), meaning a specific thermoelectromotive force corresponds to a specific temperature. Thus, temperature measurement can be achieved by measuring the thermoelectromotive force. The basic principle of thermocouple temperature measurement is that a closed loop formed by two conductors of different compositions generates a current when a temperature gradient exists between the ends, resulting in an electromotive force—thermoelectromotive force—between the ends, known as the Seebeck effect. The two homogeneous conductors of different compositions serve as thermoelectrodes; the end with the higher temperature is the working end, and the end with the lower temperature is the free end, which is usually maintained at a constant temperature. Based on the functional relationship between thermoelectromotive force and temperature, thermocouple reference tables are created; these tables are derived under the condition that the free end temperature is 3 °C, and different thermocouples have different reference tables. When a third metal material is introduced into the thermocouple loop, as long as the temperatures at its two junctions are the same, the thermoelectromotive force generated by the thermocouple remains unchanged, i.e., it is unaffected by the introduction of the third metal. Therefore, during thermocouple temperature measurement, measuring instruments can be connected; once the thermoelectromotive force is measured, the temperature of the measured medium can be determined. Thermocouple temperature measurement requires the temperature of the cold end (the end connected to the measurement circuit via lead wires, while the measurement end is the hot end) to remain constant so that the thermoelectromotive force maintains a proportional relationship with the measured temperature. If the cold end (ambient) temperature changes during measurement, it will seriously affect measurement accuracy. Taking measures at the cold end to compensate for the effects of temperature changes is called thermocouple cold junction compensation. Special compensation wires 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 the sum to temperature; (2) From temperature to millivolts: Measure the actual temperature and the cold end temperature, convert them separately to millivolt values, subtract them to obtain the net millivolt value, which corresponds to the temperature.

Pharos Marine electrical component classification

Plug-in fuses are commonly used at the end of lines for short-circuit protection of distribution branch circuits or electrical equipment. Screw-type fuses have a fuse indicator on the upper cap of the fuse element; once the fuse element blows, the indicator pops out immediately and can be observed through the glass hole on the ceramic cap. They are commonly used in machine tool electrical control equipment. Enclosed fuses are divided into filled and unfilled types. Filled fuses generally use square ceramic tubes containing quartz sand and the fuse element, offering high breaking capacity. Unfilled enclosed fuses enclose the fuse element in a sealed cylinder, having slightly lower breaking capacity. Fast-acting fuses are mainly used for short-circuit protection of semiconductor rectifier elements or rectifier devices. Since semiconductor components have very low overload capacity and can only withstand large overload currents for extremely short periods, short-circuit protection must have fast-acting blowing capability. The structure of fast-acting fuses is basically the same as that of filled enclosed fuses, but the fuse element material and shape differ; it uses a silver sheet stamped with a variable cross-section fuse element featuring V-shaped deep grooves. Fast-acting fuses, often abbreviated as "fast fuses," are characterized by fast blowing speed, high rated current, strong breaking capacity, stable current-limiting characteristics, and small size. Self-resetting fuses use sodium metal as the fuse element, which has high electrical conductivity at room temperature. When a short-circuit fault occurs in the circuit, the short-circuit current generates high heat that rapidly vaporizes the sodium; the gaseous sodium exhibits a high-resistance state, thereby limiting the short-circuit current. After the short-circuit current disappears and the temperature drops, the sodium metal restores its original good conductivity. Self-resetting fuses can only limit short-circuit current and cannot truly interrupt the circuit. Their advantage is that the fuse element does not need to be replaced, allowing for repeated use.

Weidou Intelligent Technology specializes in selling German Pharos Marine connectors, Pharos Marine switches, Pharos Marine relays, Pharos Marine controllers, Pharos Marine plugs, Pharos Marine sensors, Pharos Marine resistors, Pharos Marine capacitors, Pharos Marine buses, Pharos Marine modules, Pharos Marine cables, Pharos Marine power supplies, Pharos Marine interfaces, Pharos Marine gateways, and Pharos Marine circuit breakers. All Pharos Marine products are original imports from Germany. Customers are welcome to inquire and place orders.