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Rectifying diode rectifier circuit and description

Time:2018-04-17 | Source:JIANGSU YUTAL

The circuit problem for the rectifier diode will be difficult to understand relative to most people, but if you want to really understand the rectifier diode, it will start to understand from his circuit. Xiaobian is going to talk about the circuit of rectifier diodes for you today.

  The first is a simplest rectifier circuit, half wave rectifier circuit. It consists of a power transformer B, a rectifier diode D and a load resistor Rfz. The transformer will transform the commercial voltage (more than 220 volts) to the required alternating voltage of E2, D, and then transform the alternating current into pulsating DC.

The voltage of transformer chopping is E2, which is a sine wave voltage with direction and size varying with time. Its waveform is shown in Figure 5-2 (a). In the period of 0 ~ K, E2 is a positive half cycle, that is, the upper and the lower ends of the transformer are negative. At this time, the diode is guided by the forward voltage surface, and E2 is added to the load resistance Rfz. In the time of pi to 2 pi, E2 is negative half, the secondary end of the transformer is positive and the upper end is negative. At this time, D is subjected to reverse voltage and no conduction. Rfz has no voltage on it. In the time of pi to 2 pion, we repeat the process of 0 to pion time, and repeat the process of pi to 2 pion in 3 PPI to 4 PI time. In this way, the negative half of the alternating current is "cut" off, and only half a week through Rfz, a single right (up and down negative) voltage is obtained on the Rfz, as shown in Figure 5-2 (b), to achieve the purpose of rectification, but the load voltage is Usc. And the magnitude of load current changes with time, so it is usually called pulsating DC.

This way of removing half a week and half a week is called half wave rectification. It is not difficult to see that the half wave integration is converted to rectifying effect at the cost of half of the "sacrifice", and the current utilization rate is very low. (the calculation shows that the average value of the half wave voltage in the whole cycle, that is, the DC voltage Usc? =0.45e2?) of the load, is often used in high voltage and small current situations and in the general radio. It is rarely used in the device.

The second one is one-way bridge rectifier circuit, which is both full wave rectifier circuit. If we adjust the structure of rectifier circuit, we can get a full wave rectifier circuit that can make full use of electric energy.

The rectifier diode rectifying circuit sounds complicated, but it is because these complex structural systems can support the entire normal operation of the electronic components. If there is any doubt, please call the small editor.