Comprehensive knowledge sharing of rectifier transistors

SMD transistors are also called semiconductor transistors and bipolar transistors. Transistors are semiconductor devices that use current to control current. The main function is to amplify the weak signal into a larger amplitude electrical signal, which is also often used for contactless switches.

Advantages of rectifier transistors:

One of the advantages is that it can amplify the current, and this is also a major feature of the rectifier transistor. When the voltage of the emitter junction is greater than the PN junction, the turn-on voltage, and it is exactly at a certain value, the emitter junction of the transistor will be biased. In this situation, it is actually the current control current that plays a role, making the rectifier transistor amplify, and the current amplification is for the fixed value of a certain rectifier transistor, but as the current changes, it will also change at any time. Kind of state.

Rectifier transistor model:

There are a total of five parts in the naming of the rectifier transistor model in my country. For example, such as 3DG130C, where the first number 3 represents the transistor, DG represents a certain material used in the manufacture of the rectifier transistor, 130 is the serial number, and the latter part represents the specification number. Basically, most of the naming of the rectifier transistor model comes from this way. The commonly used transistor model series on the market include 90 series models such as 9013, 9012, 9015, 9014, 9018, 9011, etc. Different models have different rectified frequency and power.

Rectifier parameters;

The parameters of the rectifier transistor are related to storage. The longer the storage time, the larger the general parameters. In the past, people had equipment defects in the measurement of rectifier parameters, so people depended on the parameters to choose. So what are the parameters of the rectifier transistor? The current and voltage are used to specify the range of use; PCM allows the dissipation of power; HFE means the current amplification factor; FT characteristic frequency means that the current amplification is completely lost, and the operating frequency is greater than the characteristic frequency, then this circuit is abnormal; VCEO saturation voltage.

Rectifier selection:

When choosing, you can choose according to the model and parameters. Know the parameters of VCEsat, BVCEO, HFE, VCBO, BVEBO, ft, find similar rectifier transistors through the comparison of the parameters, and compare the parameters. If you don’t know the parameters well, you can query various rectifier transistors through the Internet. Specification books. If you want to choose a rectifier transistor, the editor will introduce a formula for everyone: three tops down, find the basic level; PN junction, fixed tube type; follow the arrow, deflection; undetectable, move your mouth.

The composition principle of the rectifier transistor amplifying circuit:

How is the current amplification composed? Ensure that the transmitter junction is biased and the integrated junction is reverse biased under the current amplified working state, which is the so-called proper bias; the design of the output loop ensures that the current signal after the rectifier current is amplified can be changed evenly. Into the form of electricity that needs the load, such as output current or output voltage. The design of the output circuit should make the signal coupled to the electrodes of the rectifier transistor to form a base current, thereby generating the current control relationship of the rectifier transistor.

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