Understand principle of inductance type step up adequately
[introduction] the booster principle of DC-DC of type of article introduction inductance, belong to fundamental property, suit those not to understand inductance character, but the classmate that is interested in step up circuit again at the same time.
The article introduces the booster principle of inductance type DC-DC, belong to fundamental property, suit those not to understand inductance character, but the classmate that is interested in step up circuit again at the same time.
Want to understand principle of inductance type step up adequately, with respect to the character that must know inductance, include electromagnetism changeover and porcelain store can.
We watch the figure below first:
This graph is batteries to an inductance (coil) electrify, inductance has a character—Electromagnetism changeover, report can become magnetism, magnetism also can change wire back. When electrify instant, report can turn into magnetism stores with the form of magnetism inside inductance. And cut off the power transient magnetism can become report, release from inside inductance.
However the issue came, after cutting off the power, loop has disconnected, electric current nowhere is OK, how is magnetism changed into electric current? Very simple, two end meet inductance occurrence high pressure, if of inductance coil feel oneself coefficient is very big, so meet from feeling electromotive force very big, the space between is needed in very large electromotive force, can produce very strong electric field, meet even puncture air, produce discharge phenomenon. Somebody is like around, can create particular risk to its, if around have combustible material, have produce ablaze risk.
Such, we also understood the 2nd character of inductance—-Step up character. When loop disconnects, the energy inside inductance can alternate with the form of tall voltage wire back.
Make brief summary to the content of above now:
It is to pressing generator below, you keep pulling use switch, from inside the graph node place can get boundless tall positive electricity is pressed. Voltage rises after all much taller, depend on you received what thing to let electric current have in the another end of diode place can go. If whats are received, electric current can go with respect to nowhere, then voltage can rise enough tall, switch puncture, energy is used up with hot form.
It is negative pressure generator next, you keep pulling use switch, from inside the graph node place can get boundless tall negative voltage.
What say above is academic, will nod actual circuit now, the system that views circuit of DC-DC step up is what appearance after all.
You are OK and clear see evolve, change switch into dynatron in circuit, the switch that controls dynatron with the square wave of fixed frequency can realize step up. Do not look down upon these two graphs, in fact, by these two the graph sets shift and all switch power source comes.
Say magnetism is full close an issue.
We had known inductance can store energy, save energy with magnetic field means, but how much can put, put full later what situation can you produce?
Flux, this parameter states inductance can put how many energy, according to this parameter you are OK an inductance should offer cipher out when M of N bend over brings electricity, must work to fall at much taller frequency.
Put full later meeting how? This is magnetism full the issue that close. Full after closing, inductance loses the character with all due inductance, become one pure resistance, waste energy in order to heat up a form.
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