Principle of three-level Pipes

From: http://blog.csdn.net/hoope/archive/2008/11/09/3262644.aspx

Transistor Principle

Understanding the function of transistor release remember: energy is the reason for the production of the triode production energy

Power-on Current Control

Working principle: Controls static DC through AC Input

Let us assume that the double transistor dam is strange. Two Valves, valves, valves, and valves, can be applied to the valve by gravity.

The work flow will be flushed at every time when the valve is flushed, the flow of water is flushed, and the valve is flushed with the surging flow of water.

Stop change valve start valve corresponding stop change if can be strictly proportional change perfect control complete

UBE water flow UCE Water Flow Input Signal water flow more accurate than current transistor after all, current control element

A dry river without water flow edge empty administrator wait for the valve despite the past impact valve and enable no flow storage and no flow transistor cutoff Zone

Full-zone water level administrator valve has no use of water self-Chong diode breakdown

Analog Circuit-like valve semi-pass control of its startup determines the power consumption of the water stream without signal when the water flow is working

The digital circuit valve is in or off two States. When the valve is completely closed, there is no power consumption.

I am sure I know some principles about the descriptions of the full and cut-off areas.

Let me modify the analogy:

Closing area: the closing area should be able to open the valve.

Full zone: the valve should be opened too. As for the valve, the flow of water has reached the limit, and the valve is closed so that the working state of the transistor can return to the linear zone.

Linear zone: the water flow is being adjusted

Breakdown zone: the water level is too high than the water level in the water flow reservoir (corresponding to the VCE), leading to the Gap producing water flow, and it is easier to penetrate with the lower opening and breaking voltage of the valve

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Glossary

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, Transistor
Transistor two PN knots co-located in the block semiconductor material each semiconductor transistor is two PN knots called Bipolar Junction Transistor
The current control element of the two diodes connected to the same pole of the transistor uses the base zone narrow special structure to carry out the stream diffusion compound to achieve the basis current collector current control so that the transistor is more powerful in control capacity according to the internal structure of the two tubes of the PNP Tube according to the specification connected from the group tube more powerful working ability according to the power consumption difference power transistor, power transistor, etc.

Ii. Functions and Applications

Transistor Current Signal discharge function off control function of the transistor with the discharge signal control current disconnected power supply, signal processing and so on all look at the transistor power supply route Xu transistor according to the specific circuit form to connect with some of the purpose of the elements of the transistor important current distribution element

Iii. Key Transistor Parameters

1. β value
The Beta value, an important parameter of the Beta value, describes the current signal discharge capacity of the transistor. The higher the beta value, the stronger the signal discharge capability; the Beta value can be too transistor, and the performance is too stable. The pass beta value should be set to 30 to 80. The specified transistor beta value is subject to changes in the working state of the component.

2. Inter-pole REVERSE CURRENT
The opposite current of the pole increases the stability of the transistor.

3. Reverse transistor breakdown characteristics:
The transistor is divided into two PN junction groups, and the reverse voltage exceeds the rated value. diode breakdown causes performance degradation or permanent damage.

4. operating frequency
The β value of the transistor remains above the frequency range and decreases sharply as the frequency increases.

Iv. Category

Same as Bipolar Transistor (BJT, bipolar junction transistor) polarity (MOS/mes type: Metal-oxide-Semiconductor or metal semiconductor) transistor BJT two types of load current involved in conductive MOS type load current conductive BJT Type Current Controller Module MOS type voltage controller