Weller electrical components Germany Weller model Weller price

Weller electrical components are components that can convert electrical energy into magnetic energy and store it. The structure of an inductor is similar to that of a transformer, but it has only one winding. An inductor has a certain inductance and only impedes changes in current. If the inductor is in a state with no current flowing through it, it will attempt to impede current flow when the circuit is closed; if the inductor is in a state with current flowing through it, it will attempt to maintain the current unchanged when the circuit is opened. Inductors are also known as chokes, reactors, and dynamic reactors.

Weller electrical component characteristics

The static characteristics of a sensor refer to the relationship between the output quantity and the input quantity of the sensor for static input signals. Since the 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 the input quantity as the abscissa and the corresponding output quantity as the ordinate. The main parameters characterizing the static characteristics of a sensor include: linearity, sensitivity, hysteresis, repeatability, drift, etc. (1) Linearity: refers to the degree to which the actual relationship curve between the 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 the static characteristics of a sensor. It is defined as the ratio of the increment in the output quantity to the corresponding increment in the input quantity that causes this increment. Use S to denote sensitivity. (3) Hysteresis: Hysteresis is the phenomenon where the input-output characteristic curves do not coincide during the change of the input quantity from small to large (forward stroke) and from large to small (reverse stroke). For the same magnitude of input signal, the output signals of the sensor for the forward and reverse strokes are not equal; this difference is called the hysteresis difference. (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 with time while the input quantity remains constant. There are two causes of drift: one is the structural parameters of the sensor itself; the other is the surrounding environment (such as temperature, humidity, etc.). (6) Resolution: When the sensor input increases slowly from a non-zero value, an observable change in the output occurs after exceeding a certain increment; this input increment is called the sensor resolution, i.e., the minimum input increment. (7) Threshold: When the sensor input increases slowly from zero, an observable change in the output occurs after reaching a certain value; this input value is called the sensor threshold voltage.

Weller electrical component applications

The collector-emitter current can be regarded as being controlled by the base-emitter current, which is equivalent to viewing the bipolar transistor as a "current-controlled" device. It can also be viewed as being controlled by the emitter-base junction voltage, i.e., as a "voltage-controlled" device. In fact, these two perspectives are interrelated through the current-voltage relationship across the base-emitter junction, which can be represented by the current-voltage curve of the PN junction. In analog circuit design, the current-controlled perspective is sometimes adopted because, within a certain range, the bipolar transistor exhibits approximately linear characteristics. Within this range (referred to below as the "active region"), the collector current is approximately equal to a multiple of the base current, which greatly facilitates problem analysis and control of circuit functions. When designing some basic circuits, it is assumed that the emitter-base voltage is approximately constant, in which case the collector current is approximately equal to several times the base current, and the transistor acts as a current amplifier. However, in reality, the bipolar transistor is a more complex nonlinear device, and improper bias voltage allocation will cause distortion of the output signal. Furthermore, even when operating within a specific range, its current gain is affected by factors including temperature. To design precise and reliable bipolar transistor circuits, the voltage-controlled perspective must be adopted. The voltage-controlled model introduces an exponential function to describe the voltage-current relationship; within a certain range, the functional relationship is approximately linear, allowing the transistor to be treated as a conductance element. Thus, the design of circuits such as differential amplifiers is simplified to a linear problem, so the approximate voltage-controlled perspective is also frequently selected. For translinear circuits, studying their current-voltage curves is crucial for analyzing device operation, so they are typically treated as a voltage-controlled model where the transconductance is proportional to the collector current. Transistor-level circuit design mainly uses SPICE or other similar analog circuit simulators, so the complexity of the model does not pose a significant problem for designers. However, when manually analyzing analog circuit problems, it is not always possible to adopt precise calculation methods as in classical circuit analysis, making the use of approximation methods necessary.

Weller electrical component structure

The basic structure of a voltage transformer is very similar to that of a transformer; it also has two windings, one called the primary winding and the other called the secondary winding. Both windings are mounted on or wound around the iron core. There is insulation between the two windings and between the windings and the iron core, providing electrical isolation between the two windings and between the windings and the iron core. During operation of the voltage transformer, the primary winding N1 is connected in parallel to the line, and the secondary winding N13 is connected in parallel to instruments or relays. Therefore, when measuring voltage on high-voltage lines, although the primary voltage is very high, the secondary side is low voltage, ensuring the safety of operators and instruments.

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