The induction coil and the basic knowledge of using scale
Learn about the basic knowledge of induction coil and the application of scale.
A: same as above, the filtering theory is repression; after rectification ripple DCcurrent flow to the pure DC circuit composed of a choke coil (to simplify thecircuit, reduce costs, with pure resistance for band choke) two capacitors(electrolytic) constructivism type filter circuit. The use of capacitor charging and discharging effect and choke coil through DC electrical characteristics,repression of communication to end the smooth DC DC power and get simple.
Two, choke: in the low frequency circuit for repressor low-frequencycommunication electric; pulsating DC to DC circuit between pure; it is used inthe output of the rectification circuit two filtering capacitors, choke andcapacitor constitute a PI type filter circuit. In the high frequency circuit: preventhigh-frequency current flows to the low frequency end, high frequency chokein old-fashioned regenerative radios in the flow zone; use.
Three, a sensation: we said rectifier is the communication power into DC, thenstir is to convert the DC into reverse process of communication power. We put the circuit called "the end of the process a stir device". Sensation forwaveform: a positive spin wave, sawtooth wave, trapezoidal wave, Fang Bo,rectangular wave, spike wave. Frequency by several tens of GHZ. in HZ- cable,radio application is very extensive.
In the circuit, when the current through the conductor, the electromagnetic fieldwill attack, size divided by the current of the electromagnetic field is the size of the inductor.
Inductance is defined as L=phi/i, unit is Webb
The inductor is a physical quantity to measure the electromagnetic inductioncoil attack ability. Give a into the current through the coil, the coil magnetic field around the coil will attack, there is the magnetic flux through the. The power flow into the coil is bigger, the stronger the magnetic field, the magnetic flux through the coil is bigger. Experiments confirmed that the current through the coil flux and access are directly proportional to the ratio of them is called the self inductance coefficient, also called inductance. Assuming that the magnetic flux through the coil with Phi indicated that current by I indicated that the inductance indicate with L, then L= phi /I
The unit of inductance is Henry (H), is also commonly used millihenries (mH) ormicro Henry (uH) unit. 1H=1000mH, 1H=1000000uH.
Inductance can only on non steady current effect, it features two voltageproportional to the instantaneous through his current change rate (derivative),the proportion coefficient is its "self inductance".
Inductive effect because it produces a change in the magnetic field by means of non steady current, and the magnetic field will also affect the current,therefore, that is to say, any one conductor, only it through non steady current, will produce a change of the magnetic field, which in turn will affect thecurrent, so any conductor there will be a self presentational attack.
On the motherboard can see a lot of copper wire coiled coil, the coil is calledinductance, inductance mainly divided into core inductance and a hollow inductor two, core inductor inductance used in filter circuit, hollow inductor inductance is small, commonly used in high frequency circuit.
Characteristics of capacitance and inductance characteristics and just on the contrary, it has the characteristics of communication power through repressionand let the DC through smoothly. Inductance characteristics is through DC and resistance of communication, the higher the frequency, the greater the coilimpedance. In the circuit and capacitor inductor often work together, constitute the LC filter and LC vibrator. Additional, we also use the inductancecharacteristics, making the choke coil, transformer, relay.
Inductor varieties: according to the shape, the inductor can be divided into the hollow inductors (hollow coil inductors) and solid (solid coil). According to the nature of the work, the inductor can be divided into the high frequency inductor (various antenna coil, vibration coil) and low frequency inductor(various choke coil, filter etc.). According to package way, the inductor can bedivided into general inductor, color ring inductor and inductor, SMD inductoretc. epoxy resin. In accordance with the inductance inductor can be divided into fixed inductors and tunable inductors. Inductance effect: through the DCresistance through communication, DC: the so-called direct current is refers in the DC circuit, the inductive effect is equivalent to a wire, can not afford to have any effect. Resistance in communication: communication circuit,inductance have impedance, namely XL, current all circuits become smallerhave a certain effect, prevent to communication.
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