Furnas electrical components Germany Furnas model Furnas price

Furnas electrical components are devices that convert alternating current into direct current, and can be used in power supply units and for detecting radio signals, etc. Rectifiers can be made from vacuum tubes, ignitrons, solid-state silicon semiconductor diodes, mercury arcs, etc. Conversely, a device that converts direct current into alternating current is called an "inverter". In standby UPS, it is only necessary to charge the battery, not to supply power to the load, so there is only a charger. In double-conversion UPS, this device supplies power to the inverter and also charges the battery, so it is called a rectifier/charger. A rectifier is a rectification device; simply put, it is a device that converts AC to DC. It has two main functions: first, to convert AC to DC, which is then filtered and supplied to the load or to the inverter; second, to provide charging voltage to the battery. Therefore, it also acts as a charger.

Furnas electrical component principle

Electrodynamic loudspeakers, also known as moving-coil loudspeakers, are electroacoustic transducers based on the electrodynamic principle. They are the most widely used loudspeakers, primarily for three reasons: 1. Electrodynamic loudspeakers have a simple structure and are easy to manufacture. They do not require large spaces, resulting in low costs and widespread adoption. 2. These loudspeakers can achieve excellent performance, with uniform frequency response in the mid-frequency range. 3. These loudspeakers are continuously improving. Decades of loudspeaker development history reflect continuous improvements in design, craftsmanship, and materials, as well as performance advancements over time. Electrodynamic loudspeakers are mostly cone-shaped or dome-shaped. The structure of a cone loudspeaker can be divided into three parts: 1. The vibration system includes the diaphragm, voice coil, centering spider, dust cap, etc. 2. The magnetic circuit system includes the upper pole plate, pole piece, lower pole plate, magnet, etc. 9. The auxiliary system includes the basket, surround, terminal board, and phase plug. According to Faraday's law, when a current-carrying conductor passes through a magnetic field, it experiences an electromagnetic force. Its direction conforms to Fleming's left-hand rule, with the force perpendicular to both the current and the magnetic field directions. The magnitude of the force is proportional to the current, wire length, and magnetic flux density. When an alternating audio current is input to the voice coil, the coil experiences an alternating driving force, producing alternating motion. This drives the paper cone to vibrate, repeatedly pushing air to produce sound.

Furnas electrical component principle

A crystal diode consists of a p-n junction formed by p-type semiconductor and n-type semiconductor. A space charge layer forms on both sides of the interface, establishing a built-in electric field. When no external voltage is applied, the diffusion current caused by the carrier concentration difference across the p-n junction equals the drift current caused by the built-in electric field, resulting in electrical equilibrium. When a forward voltage bias is applied externally, the mutual cancellation between the external electric field and the built-in electric field increases the carrier diffusion current, causing a forward current. When a reverse voltage bias is applied externally, the external electric field further strengthens the built-in electric field, forming a reverse saturation current within a certain reverse voltage range that is independent of the reverse bias voltage value. When the applied reverse voltage reaches a certain level, the electric field strength in the space charge layer of the p-n junction reaches a critical value, triggering a carrier multiplication process. This generates a large number of electron-hole pairs, resulting in a significant reverse breakdown current, known as the diode breakdown phenomenon.

Furnas electrical component characteristics

Common types include RC phase-shift bridge trigger circuits, unijunction transistor trigger circuits, bipolar junction transistor trigger circuits, and trigger circuits that use small thyristors to trigger large thyristors, among others. The main parameters of thyristors are: 1, rated on-state average current IT: Under specified conditions, the average value of the 50 Hz sinusoidal half-wave current that can continuously pass between the anode and cathode. 2, forward blocking peak voltage VPF: With the gate open and no trigger signal applied, and before the anode forward voltage exceeds the turn-on voltage, this is the repetitive forward peak voltage that can be applied across the thyristor. The forward peak voltage withstandable by the thyristor must not exceed this parameter value given in the datasheet. 3, reverse blocking peak voltage VPR: When the thyristor is under reverse voltage and in the reverse blocking state, this is the repetitive reverse peak voltage that can be applied across the thyristor. During use, this parameter value given in the datasheet must not be exceeded. 4, trigger voltage VGT: At the specified ambient temperature, with a certain voltage applied between the anode and cathode, this is the minimum gate current and voltage required for the thyristor to switch from the off state to the on state. 14, holding current IH: At the specified temperature, with the gate circuit open, this is the minimum anode forward current required to maintain the thyristor in the conducting state. Many new types of thyristor components have been introduced, such as fast thyristors suitable for high-frequency applications, triacs that can be controlled to conduct in both directions using positive or negative trigger signals, and thyristors that can be turned on by a positive trigger signal and turned off by a negative trigger signal, etc.

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