Funke & Huster electrical components German Funke & Huster models Funke & Huster prices

Funke & Huster electrical components are a common light-emitting device that emits light by releasing energy through the recombination of electrons and holes, and they are widely used in the lighting field. Light-emitting diodes can efficiently convert electrical energy into light energy and have extensive uses in modern society, such as lighting, flat-panel displays, and medical devices. This electronic component first appeared in 1962, initially only emitting low-intensity red light. Later, versions emitting other monochromatic lights were developed, with emitted light covering the visible spectrum, infrared, and ultraviolet ranges, and luminous intensity increased significantly. Their applications evolved from initial use as indicator lights and display panels; light-emitting diodes are abbreviated as LED. They are made from compounds containing gallium, arsenic, phosphorus, nitrogen, etc. When electrons and holes recombine, they emit visible light, allowing them to be used to manufacture light-emitting diodes. They serve as indicator lights in circuits and instruments, or form text and numeric displays. Gallium arsenide diodes emit red light, gallium phosphide diodes emit green light, silicon carbide diodes emit yellow light, and gallium nitride diodes emit blue light. Based on chemical properties, they are divided into organic light-emitting diodes (OLED) and inorganic light-emitting diodes (LED). LED was initially used for indicative lighting in instruments and meters, later expanding to traffic signals, landscape lighting, automotive lighting, and mobile phone keypads and backlights. Later, new technology for micro-light-emitting diodes (micro-LED) was developed, significantly reducing the size of traditional light-emitting diodes. Arrays of independently emitting red, blue, and green micro-LEDs form display arrays for display technology applications. Micro-LEDs feature self-emissive display characteristics, offering higher efficiency, longer lifespan, and greater stability against environmental influences compared to self-emissive organic light-emitting diodes.

Funke & Huster electrical component principles

Mainly consists of LC circuits composed of capacitors and inductors, generating free oscillations through the mutual conversion of electric field energy and magnetic field energy. To sustain oscillation, an amplifier circuit with positive feedback is required. LC oscillators are further divided into transformer-coupled and three-point oscillators. Many applications use quartz crystal oscillators, and there are also LC oscillators composed of integrated operational amplifiers. Since component parameters cannot be perfectly identical, the states of two transistors change at the moment power is applied. This change intensifies due to positive feedback, leading to a quasi-stable state. During this quasi-stable period, the other transistor gradually charges via a capacitor and then conducts or cuts off, causing a state flip to another quasi-stable state. This cycle repeats to form oscillation.

Funke & Huster electrical component principles

Current levels vary significantly in power generation, transformation, transmission, distribution, and consumption lines, ranging from a few amperes to tens of thousands of amperes. For ease of measurement, protection, and control, currents need to be converted to a more uniform level. Additionally, voltages on lines are generally high, making direct measurement very dangerous. Current transformers serve the functions of current transformation and electrical isolation. For analog ammeters, the secondary current of current transformers is mostly in the ampere range. For digital instruments, sampled signals are generally in the milliampere range. The secondary current of miniature current transformers is in the milliampere range, primarily serving as a bridge between large transformers and sampling. Miniature current transformers are also referred to as 'instrument current transformers.' ('Instrument current transformers' also implies precision current transformers with multiple current ratios used in laboratories, generally for extending instrument ranges.) Similar to transformers, current transformers operate based on the principle of electromagnetic induction; transformers transform voltage, whereas current transformers transform current. The winding connected to the measured current is called the primary winding; the winding connected to the measuring instrument is called the secondary winding. The ratio of the primary winding current I1 to the secondary winding I10 current is called the actual current ratio K. The current ratio when the current transformer operates at rated current is called the rated current ratio of the current transformer, denoted by Kn.

Funke & Huster 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. Screw-type fuses. Enclosed fuses are divided into filled and non-filled types. Filled fuses generally use square ceramic tubes containing quartz sand and the fuse element, offering high breaking capacity. Non-filled 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 units. Since semiconductor components have very low overload capacity and can only withstand large overload currents for extremely short periods, short-circuit protection requires fast-acting fusing 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 into a variable cross-section fuse element with V shaped deep grooves. Fast-acting fuses are commonly abbreviated as 'fast fuses,' characterized by fast fusing speed, high rated current, strong breaking capacity, stable current-limiting characteristics, and small volume. 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 temperatures that rapidly vaporize the sodium. The gaseous sodium presents a high-resistance state, thereby limiting the short-circuit current. When 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 replacement, allowing repeated use.

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