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The aluminum oxide rectifier shares a half-wave rectifier circuit with you

  A half-wave rectifier circuit is one of the simplest rectifier circuits. 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, and D converts the alternating current into pulsating direct current. 　The transformer slash voltage e2 is a sine wave voltage that changes in direction and magnitude with time, and its waveform is shown in Figure 5-2(a). In the time of 0~K, e2 is positive for half a cycle, that is, the upper end of the transformer is positive and the lower end is negative. At this time, the diode is turned on by the positive voltage surface, and e2 is added to the load resistance Rfz through it, and in the time of π~2π, e2 is negative for half a cycle, and the lower end of the transformer secondary is positive, and the upper end is negative. At this time, D is subjected to reverse voltage, not on, Rfz, and no voltage on it. In 2π~3π time, the process of 0~π time is repeated, and in 3π~4π time, the process of π~2π time is repeated... If this is repeated, the negative half cycle of the alternating current is "cut", and only the positive half cycle passes through the Rfz, and a single right-hand (positive and negative up) voltage is obtained on the Rfz, as shown in Figure 5-2(b), which achieves the purpose of rectification, but the load voltage Usc. As well as the magnitude of the load current also varies with time, therefore, it is often referred to as pulsating DC.