schmidt electrical components Germany schmidt model schmidt price

schmidt electrical components are resistive devices with nonlinear voltage-current characteristics, primarily used for voltage clamping when circuits experience overvoltage, absorbing excess current to protect sensitive components. The resistive body material of varistors is semiconductor, making them a type of semiconductor resistor. The widely used "zinc oxide" varistor has a main body composed of divalent zinc and hexavalent oxygen. Therefore, from a materials perspective, zinc oxide varistors are a type of "II-VI group oxide semiconductor". In Taiwan, China, varistors are called "surge absorbers", and are sometimes also referred to as "electric shock (surge) suppressors (absorbers)". Varistors are voltage-limiting protection devices. Utilizing the nonlinear characteristics of varistors, when overvoltage appears across the two poles of a varistor, the varistor can clamp the voltage to a relatively fixed value, thereby protecting downstream circuits. The main parameters of varistors include: varistor voltage, current handling capacity, junction capacitance, response time, etc. The response time of varistors is in the ns range, faster than gas discharge tubes, but slightly slower than TVS tubes. Generally, their response speed meets the requirements for overvoltage protection in electronic circuits. The junction capacitance of varistors is typically in the range of hundreds to thousands of Pf, making them unsuitable for direct application in high-frequency signal line protection in many cases. When applied in AC circuit protection, their larger junction capacitance increases leakage current, which must be fully considered in protection circuit design. Varistors have a large current handling capacity, but it is smaller than that of gas discharge tubes. Varistors, abbreviated as VDR, are voltage-sensitive nonlinear overvoltage protection semiconductor components.

schmidt electrical component structure

Generators are typically composed of stators, rotors, end covers, bearings, and other components. The stator consists of the stator core, winding coils, frame, and other structural parts that secure these components. The rotor consists of the rotor core (or magnetic poles, yoke), windings, retaining rings, centering rings, slip rings, fans, and shafts. Bearings and end covers connect and assemble the generator's stator and rotor, allowing the rotor to rotate within the stator, cutting magnetic flux lines to generate induced electromotive force, which is led out through terminal blocks and connected to the circuit to produce current.

schmidt electrical component performance

(1) Electromotive force: Electromotive force is the difference between the equilibrium electrode potentials of two electrodes. (2) Rated capacity: The theoretical capacity of a battery can be precisely calculated based on the amount of active electrode material in the battery reaction equation and the electrochemical equivalent of the active material calculated according to Faraday's law. Due to possible side reactions in the battery and special design requirements, the actual capacity of the battery is often lower than the theoretical capacity. (3) Rated voltage: The typical operating voltage of a battery at room temperature, also known as nominal voltage. It serves as a reference when selecting different types of batteries. The actual operating voltage of a battery equals the difference between the equilibrium electrode potentials of the positive and negative electrodes under different usage conditions. It is related only to the type of electrode active material, not to the quantity of active material. Battery voltage is essentially DC voltage, but under certain special conditions, phase changes in metal crystals or certain formation films caused by electrode reactions can cause minor voltage fluctuations, a phenomenon known as noise. The amplitude of fluctuation is small but the frequency range is wide, distinguishing it from self-excited noise in circuits. (4) Open-circuit voltage: The terminal voltage of a battery in an open-circuit state is called open-circuit voltage. The open-circuit voltage of a battery equals the difference between the positive electrode potential and the negative electrode potential when the battery is in an open circuit (i.e., no current flows between the two poles). The open-circuit voltage of a battery is denoted by V open, and is generally less than its electromotive force. This is because the electrode potentials established by the two poles in the electrolyte solution are usually not equilibrium electrode potentials, but stable electrode potentials. Generally, the open-circuit voltage of a battery can be approximated as its electromotive force. (5) Internal resistance: Battery internal resistance refers to the resistance encountered when current flows through the battery. It includes ohmic internal resistance and polarization internal resistance; polarization internal resistance further includes electrochemical polarization internal resistance and concentration polarization internal resistance. Due to the presence of internal resistance, the operating voltage of a battery is always less than its electromotive force or open-circuit voltage. Battery internal resistance is not constant; it changes continuously (gradually increasing) during charging and discharging processes because the composition of active materials, electrolyte concentration, and temperature are constantly changing. Ohmic internal resistance obeys Ohm's law, while polarization internal resistance increases with current density, but not linearly. It generally increases with increasing current density. Internal resistance is an important indicator determining battery performance, directly affecting operating voltage, operating current, output energy, and power. For batteries, the lower the internal resistance, the better. (6) Impedance: Batteries have a large electrode-electrolyte interface area, so a battery can be equivalent to a series circuit of a large capacitor with small resistance and inductance. However, the actual situation is much more complex, especially since battery impedance changes with time and DC level; measured impedance is only valid for specific measurement states. (7) Charge/discharge rate: There are two representation methods: hour rate and C-rate. Hour rate represents the charge/discharge rate by charge/discharge time, numerically equal to the battery's rated capacity (ampere-hours) divided by the specified charge/discharge current (amperes) to obtain the number of hours. C-rate is another representation of charge/discharge rate, numerically the reciprocal of the hour rate. The discharge rate of primary batteries is represented by the time taken to discharge through a fixed resistor to the cutoff voltage. Discharge rate has a significant impact on battery performance. (8) Service life: Storage life refers to the maximum allowable storage time from battery manufacture to initial use, measured in years. The total period including storage and usage periods is called the battery's validity period. Storage battery life is distinguished into dry storage life and wet storage life. Cycle life is the maximum number of charge/discharge cycles a rechargeable battery can achieve under specified conditions. When specifying cycle life, the charge/discharge cycle test protocol must also be specified, including charge/discharge rate, depth of discharge, and ambient temperature range. (9) Self-discharge rate: The rate at which a battery loses capacity on its own during storage. It is expressed as the percentage of capacity lost due to self-discharge per unit storage time relative to the capacity before storage.

schmidt electrical component characteristics

The static characteristics of a sensor refer to the relationship between the output and input quantities for static input signals. Since both input and output quantities are independent of time in this case, their relationship, i.e., the static characteristics of the sensor, can be described by an algebraic equation without time variables, or by a characteristic curve plotted with input quantity as the abscissa and corresponding output quantity as the ordinate. The main parameters characterizing sensor static characteristics include: linearity, sensitivity, hysteresis, repeatability, drift, etc. (1) Linearity: Refers to the degree to which the actual relationship curve between sensor output and input deviates from the fitted straight line. It is defined as the ratio of the maximum deviation between the actual characteristic curve and the fitted straight line over the full scale range to the full-scale output value. (2) Sensitivity: Sensitivity is an important indicator of sensor static characteristics. It is defined as the ratio of the increment in output quantity to the corresponding increment in input quantity causing that increment. Sensitivity is denoted by S. (3) Hysteresis: Hysteresis is the phenomenon where the input-output characteristic curves do not coincide when the input quantity changes from small to large (forward stroke) and from large to small (reverse stroke). For the same magnitude of input signal, the output signal magnitudes for the forward and reverse strokes of the sensor are not equal; this difference is called the hysteresis error. (4) Repeatability: Repeatability refers to the degree of inconsistency in the characteristic curves obtained when the sensor input quantity undergoes continuous multiple full-scale changes in the same direction. (5) Drift: Sensor drift refers to the phenomenon where the sensor output changes over time while the input quantity remains constant. There are two causes of drift: one is the sensor's own structural parameters; the other is the surrounding environment (such as temperature, humidity, etc.). (6) Resolution: When the sensor input slowly increases from a non-zero value, an observable change in output occurs after exceeding a certain increment; this input increment is called the sensor's resolution, i.e., the minimum input increment. (7) Threshold: When the sensor input slowly increases from zero, an observable change in output occurs after reaching a certain value; this input value is called the sensor's threshold voltage.

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