What is a half-wave rectifier circuit?
answer:
The picture above is the simplest rectifier circuit. It consists of a power transformer B, a rectifier diode D and a load resistor Rfz. The transformer converts the mains voltage (mostly 220 volts) into the required alternating voltage e2, which in turn converts the alternating current into pulsating direct current.
Let's see how the diode is rectified from the waveform diagram.
The transformer cut-off voltage e2 is a sine wave voltage whose direction and magnitude change with time. Its waveform is shown in Figure 5-2(a). In the 0 to K time, e2 is positive half cycle, that is, the upper end of the transformer is negative at the lower end. At this time, the diode is subjected to the forward voltage surface conduction, and e2 is applied to the load resistor Rfz through it. In the period of π~2π, e2 is a negative half cycle, and the lower end of the transformer is positive and the upper end is negative. At this time, D is subjected to reverse voltage, no conduction, and no voltage on Rfz. In the π~2π time, the process of 0~π time is repeated, and in the time of 3π~4π, the process of π~2π time is repeated... This is repeated, the negative half cycle of the alternating current is "cut", only positive Half-cycle through Rfz, a single right-direction (upper-down-down) voltage is obtained on Rfz, as shown in Figure 5-2(b), for rectification purposes, however, the load voltage Usc. And the magnitude of the load current also varies with time, so it is often referred to as pulsating DC.
This rectification method of removing the half cycle and the lower half of the figure is called half-wave rectification. It is not difficult to see that the half-wave symmetry is exchanged for the rectification effect at the expense of half of the "sacrificial" exchange, and the current utilization rate is very low (calculation shows that the average value of the half-wave voltage obtained by rectification over the entire period, that is, the load The DC voltage Usc = 0.45e2) is therefore commonly used in high voltage, low current applications, and is rarely used in general radios.
Thin film transistor liquid crystal display, commonly referred to as the TFT-LCD, is a type of liquid crystal display that USES thin-film transistor technology to improve the image quality. Although TFT-LCD is collectively known as LCD, it is an active matrix LCD used in televisions, flat screens and projectors.
Simply put, the TFT-LCD Panel can be seen as a layer of liquid crystal sandwiched between two glass substrates, the upper glass substrates being color filters, and the lower glass having transistors embedded in it. When the current passes through the transistor, the electric field changes and the liquid crystal molecules deflect, so as to change the polarization of the light, and then the polarizer is used to determine the light and dark state of the pixel. In addition, the upper glass is fitted to the color filter, so that each pixel contains three colors of red, blue and green, which make up the video image on the panel.
The Thin film Liquid Crystal Display is a type of most liquid crystal display that USES thin-film transistor technology to improve the image quality. Although TFT-LCD is generally referred to as LCD, it is an active matrix LCD. It is used in TV, flat panel display and projector.
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