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How to judge the rectifier diode conduction and cut-off?

How to determine the rectifier diode is on, and what is the working principle of the circuit?

After the AC input voltage is added to the rectifier diode, how to judge whether the rectifier diode is on or off is the key to whether the circuit working principle analysis is correct.

The so-called "positive to positive on" is: when the positive half cycle of the AC input voltage is added to the positive pole of the rectifier diode, the rectifier diode is turned on: "negative to negative on" is the rectifier diode conduction when the negative half cycle of the AC input voltage is added to the negative pole of the rectifier diode;