A choke is the common name given to an inductor that is used as a power supply filter element. It is an inductor used to block higher-frequency alternating current (AC) in an electrical circuit, while passing lower-frequency or direct current (DC). A choke usually consists of a coil of insulated wire and they are typically gapped iron core units, similar in appearance to a small transformer, but with only two leads exiting the housing. The current in an inductor cannot change instantaneously that is inductors tend to resist any change in current flow. This property makes them good for use as filter elements, since they tend to smooth out the ripples in the rectified voltage waveform. The choke’s impedance rises with frequency. Its low electrical resistance passes both AC and DC with little power loss, but it can limit the amount of AC owing to its reactance. A choke is used in position of a series resistor because the choke allows superior filtering and less voltage drop.
More about this can be seen in Eric Bogatin’s post on EDN where he comes up with a nice rule of thumb:
If you were to picture multiple traces in the same dielectric space you can see that the fields would overlap and consequently interact with each other. This is one of the primary causes of crosstalk. Another way of saying this is that crosstalk occurs in the whitespace between the conductors where the fields overlap and interact.
[G01C] MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effect, propagation time, of radio waves, analogous arrangements using other waves G01S)
The dominant power semiconductor types are based on silicon, namely the power MOSFET and the insulated-gate bipolar transistor (IGBT). Power MOSFETs are used in applications up to 900 volts. IGBTs, the leading midrange power semiconductor, are used for 400-volt to 10-kilovolt applications.
Other systems include the identical Festival Ranch battery and the Punkin Center system, both supplied by Fluence.
Abstract: Embodiments include methods of powerline communications using a preamble with band extension is provided. A method may include receiving a packet data unit PDU. Bit-level repetition is applied to at least a portion of the PDU to create a repeated portion. Interleaving is performed per a subchannel. Pilot tones are inserted in the interleaved portion. Each data tone is modulated with respect to a nearest one of the inserted pilot tones. The PDU is transmitted over a power line.
[G01N] INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
Of course, using a FET driver chip is probably more in keeping with modernity and flexibility for higher drive voltages/currents.
Hack -a- Day suggests hacks, maybe one a day even. But this “You can electronics” crap needs to be somewhere else, but don’t waste space on the HaD servers for it either…
What were voluntary guidelines became mandatory after 2003 with tougher U.S. legislation and million-dollar-a-day penalties that spilled over to Canada for infractions that include poor tree-trimming under transmission lines.
En este tipo de circuitos, si quitas la bobina no funcionan (si la cortocircuitas te cargas el chip). En un rectificador convencional en el que se usa un circuito LC de filtro, si cambias la bobina por un puente el rizado aumenta un poco, pero sigue funcionando tal cual.
Weekly wrap: Butterfly, Siris Capital, Symplr | Power Inductor Coil Related Video:
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