The utility that 3 class provide
Dynatron, full name should be semiconductor dynatron, also say ambipolar model dynatron of transistor, crystal, the semiconductor device · that is electric current of control of a kind of electric current its action is a faint signal enlarge the telegraphic number with the larger value that become spoke, have voltaic enlarge effect, also use as without contact switch, it is the core component of electronic circuit. You magnify to dynatron job principle, dynatron circuit principle is mixedThe action of dynatronDo these knowledge understand? The article will be everybody introductionThe action of dynatronrelevant knowledge, if you are interested in these knowledge, then the article suited you not to pass again. Understand the pertinent information of dynatron and data then with me together!
Dynatron job principle
Crystal dynatron (dynatron of the following abbreviation) by material cent has two kinds: Germanium canal and silicon are in charge of. And avery kind of has NPN and PNP again two kinds of configuration, but use most is silicon NPN and germanium PNP two kinds of dynatron, (Among them, n expresses to join phosphor in tall purity silicon, it is to point to replace atom of a few silicon, free electron electric conduction arises below voltage stimulation, and P is to join boron to replace silicon, generate many cavity profit at electric conduction)
One, voltaic enlarge principle
The analysis below only to NPN silicon dynatron. We flow to from base B blast off extremely the electric current of E calls base electric current Ib; flow to from collector C blast off extremely the electric current of E calls collector electric current Ic. The direction of these two electric current is to pour out of blast off extremely, blast off so extremely the way that an arrowhead will come to express electric current was used on E. The enlarge action of dynatron is: The control that collector electric current gets base electricity (hypothesis power source can offer collector enough the word) of big electric current, and the change with base very little electric current, can cause the change with collector very big electric current, and the scale with contented and constant change concerns: The β that the metabolic quantity of collector electric current is quantity of change of base electric current times, namely voltaic change was magnified β times, the enlarge that so we call β dynatron is diploid (β is general and ambitious at 1, for example a few, hundreds of) . If we add the small signal of a change base to follow,blast off extremely between, this can cause the change of Ib of base electric current, after the change of Ib is magnified, caused the change with very big Ic. If Ic of collector electric current has shed R of a resistor, can calculate according to U=R*I of voltage computation formula so, the voltage on this resistor can produce very big change. We take the voltage on this resistor, the voltage signal after getting enlarge.
2, switch action principle
The saturated condition of dynatron says below. Resemble above in that way graph, because get the limitation of resistor Rc (Rc is fixed cost, so the biggest electric current is U/Rc, among them U is) of power source voltage, collector electric current is cannot increase indefinitely those who go down. When the accretion of base electric current, when cannot making collector electric current continues to increase, dynatron entered saturated state. The criterion with general judgement whether saturated dynatron is: Ib* β > Ic. After entering saturated state, the collector of dynatron follows blast off extremely the tension between will be very little, understandable for switch closed. Such we can take dynatron to regard as switch uses: It is when base electric current 0 when, dynatron collector electric current is 0(this is called dynatron to end) , be equivalent to switch disconnecting; is become base electric current is very big, so that dynatron is saturated when, be equivalent to switch closing. If main job is in dynatron,end and saturated condition, so such dynatron we call it switch canal commonly.
The action of dynatron
Crystal dynatron has voltaic enlarge effect, it is dynatron character actually can control the change with collector bigger electric current to measure with the metabolic amount with base small electric current. This is the it is the mainest to mix character with the mainest dynatron. We call the specific value of Ib of Δ Ic/ Δ the electric current of crystal dynatron to put big multiple, with the symbol ” β ” express. Voltaic enlarge multiple to some a calm value is for dynatron only, but the change of electric current of the base when working as dynatron also can have constant change.
(1) enlarge flows. silicon controlled rectifier of a small-power and combination of dynatron of a high-power, attainable silicon controlled rectifier of a high-power, its are the biggest output electric current is decided by the character of high-power dynatron, see attached drawing 9(a) . Graph 9(b) enlarges circuit for capacitance capacity. The phone that uses dynatron exiles your work is used, enlarge capacitance capacity a certain number of times. This kind of equivalent capacitance and general capacitor are same, but float buy works, apply to time capacitor is made in circuit of long delay time. Although the stabilized voltage circuit that makes with stabilized voltage diode has simple, element the advantage with the little, convenient economy that make, but because stabilized voltage diode stabilizes electric current,count 10 milliampere only commonly, decided it can be used in load current only consequently not quite big circumstance. Graph 9(c) can make the stable electric current of diode of former stabilized voltage and dynamic resistor limits get bigger patulous, steady performance is attainable bigger improvement.
(2) generation is changed. The two dynatron series connection in graph 9(d) can take the place of directly in changing the desk lamp that move light two-way spark the dynatron in 9(e) of diode; graph can substitute the stabilized voltage canal that 8V controls. The dynatron in graph 9(f) can substitute the stabilized voltage canal that 30V controls. When afore-mentioned application, the base of dynatron all is not used.
(3) imitate. The circuit that becomes quite with dynatron is OK still imitate other yuan parts of an apparatus. High-power is alterable resistor price is expensive look for hard, circuit of the 9(g) that use a figure can make imitate taste, adjust the block value of 510 resistor, can adjust dynatron C, E is polar the impedance between, this impedance change can replace alterable resistor to use. Graph 9(h) is in charge of to use dynatron simulative stabilized voltage. Principle of its stabilized voltage is: When the input tension that increases two end of A, B rises, because of the B of dynatron, E knot pressing falls basic and changeless, two end of reason R2 are pressed fall rise, the electricity that passes R2 rises, dynatron emissive knot is slanting increase, its guide epicene also increase, the equivalent resistance that presents between C, E pole is reduced, pressure fall reduce, the input voltage that makes AB is carried thereby drops. Adjust R2 can adjust the stabilized voltage value that this imitate stabilized voltage provides.
Dynatron is measured
Specific means is 1k blocks the R × that holds back avometer attune to report, put on a foot of dynatron with red watch pen first, what with black list the pen touchs dynatron is additional two feet, if two allpass, the base that the foot that the red place that express a pen puts is dynatron (B) . If was not found, pen of red watch changes another foot of dynatron, if had been not found,measure; twice again, pen of red watch is changed again, measure twice again. If had been not found, convert on a foot that black list pen puts in dynatron, with red watch the pen is measured twice look whether allpass, if do not have a success,change again. Measure 12 times at most so, always can find base. Dynatron has two kinds of kinds only, namely PNP with NPN model. Should know base is P material only when differentiate return N material can. When be blocked with 1k of avometer R × , black list pen represents power source anode, if black list pen is received,guide when base, the base that shows dynatron is P material, dynatron is NPN namely model. If red watch pen receives base to guide,connect, explain dynatron base is N material, dynatron is PNP namely model.
Editor summary: Above is the action of dynatron, the relevant introduction of the working principle of dynatron, if you want to understand more professional dynatron knowledge, the proposal seeks advice from professional personage.