1. The schematic diagram of the circuit is as follows
Figure 1 桥式整流电路
2. Waveforms of key nodes
Figure 2 整流电路相关波形
3. Output voltage
Fourth, the output current
IO (AV) = Uo / RL ≈ 0.9 U2 / RL
5. Device selection
a). The forward average current of the diode is equal to half of the average current of the load, because each diode is only turned on for half a cycle in a cycle, ID(AV) = 0.5 IO(AV)
b). Reverse withstand voltage of the diode:
c). The textbook mentions that when selecting devices, it is necessary to consider the fluctuation of 10% of the grid voltage, so the current and voltage should be selected according to the calculated value of 1.1 times.
d). However, in the actual engineering design, there is also a consideration of the derating design of the device, and there are no special requirements, and the design can generally be derated according to level III.