peter electrical components Germany peter model peter price

peter electrical component is a pyroelectric infrared sensor, a device composed of thermocouples. It is widely used as a temperature detection device in fields such as ear thermometers, radiation thermometers, electric ovens, and food temperature testing. The entry details the basic unit of the thermopile—the thermocouple; and provides a detailed introduction to the structure, working principle, main parameters, and applications of the thermopile.

peter electrical component performance

1. Protection characteristics: when the impact strength of the surge source does not exceed the specified value, the clamping voltage of the varistor must not exceed the impulse withstand voltage that the protected object can endure. 2. Surge withstand characteristics: the varistor itself must be able to withstand the specified surge current, surge energy, and the average power during successive surges. 3. Life characteristics include two aspects: one is the continuous operating voltage life, meaning the varistor should reliably operate for a specified time (in hours) under specified ambient temperature and system voltage conditions; the other is the surge life, meaning it can reliably withstand a specified number of surges. 4. After the varistor is integrated into the system, in addition to its "safety valve" protection role, it introduces some additional effects, known as "secondary effects," which should not degrade the normal operating performance of the system. The main factors to consider are three: first, the inherent capacitance of the varistor; second, the leakage current under system voltage; and third, the influence of the varistor's nonlinear current coupling through the source impedance on other circuits.

peter electrical component principle

Inductance is the ratio of the magnetic flux in and around a conductor to the current producing this flux when alternating current flows through the conductor. When direct current flows through an inductor, only static magnetic field lines are present around it, which do not change with time; however, when alternating current flows through a coil, the surrounding magnetic field lines change with time. Analyzed according to Faraday's law of electromagnetic induction—magnetism generating electricity—changing magnetic field lines produce an induced electromotive force (EMF) at both ends of the coil, which acts like a "new power source." When a closed loop is formed, this induced EMF generates an induced current. According to Lenz's law, the total magnetic flux generated by the induced current attempts to oppose the change in the original magnetic flux. Since the change in the original magnetic flux originates from the changes in the external AC power source, objectively, the inductive coil has the characteristic of opposing changes in current in an AC circuit. The inductive coil has a characteristic similar to inertia in mechanics, named "self-induction" in electrical engineering. Typically, sparks occur at the instant of opening or closing a knife switch, which is caused by the high induced EMF generated by the self-induction phenomenon.

peter electrical component classification

For different application scenarios, the purpose of using varistors and the voltage/current stresses applied to them vary, leading to different requirements for varistors. It is crucial to distinguish these differences for correct usage. Based on the intended use, varistors can be categorized into two main types: protection varistors and circuit-function varistors. (1) Protection varistors: 1 Distinguish between power supply protection varistors and signal line or data line protection varistors, as they must meet different technical standards. 2 Depending on the continuous operating voltage applied to the varistor, varistors used across power lines can be classified into AC type or DC type, with different aging characteristics under these two voltage stress conditions. 10 Based on the abnormal overvoltage characteristics that the varistor can withstand, varistors can be divided into three types: surge suppression type, high-power type, and high-energy type. (2) Surge suppression type: Refers to varistors used to suppress transient overvoltages such as lightning-induced overvoltages and switching overvoltages. These transient overvoltages occur randomly and non-periodically, and the peak current and voltage may be very high. The vast majority of varistors fall into this category. (3) High-power type: Refers to varistors used to absorb periodic continuous pulse groups, such as varistors connected in parallel to switching power supply converters. Here, the impulse voltage occurs periodically with a known period, and the energy value can generally be calculated. Although the voltage peak is not very high, the average power is considerable due to the high frequency of occurrence. (4) High-energy type: Refers to varistors used to absorb magnetic energy from large inductive coils such as generator excitation coils and lifting electromagnet coils. For such applications, the primary technical indicator is energy absorption capacity. In most application scenarios, the protective function of varistors can act repeatedly; however, they are sometimes designed as one-time protective devices similar to current fuses. For example, varistors with short-circuit contacts connected in parallel to the load of certain current transformers.

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