Selection of rectifier electronic components

This circuit is very strange. What is it used for? These four diodes are definitely not rectified:

Rectification usually refers to changing alternating current into direct current (or pulsating direct current). The diodes in the circuit you gave are all connected in series in reverse, and the positive and negative phases of the current are conductive, so it can't be rectified. At best, it only uses the turn-on voltage drop of diode to reduce the voltage of tens of volts, but this is hard to say; Because the capacitance of the diode connected in parallel is relatively large (10000uf mentioned above), the larger the capacitance, the smaller the capacitive reactance. I didn't calculate the specific capacitive reactance. I just want to say that when the capacitive reactance is much smaller than the on-resistance of the diode, most of the current passes through the capacitor, and the diode cannot reduce the voltage.

Secondly, the transformer (inductive load), whose primary input can't rectify DC.

If the primary input voltage of transformer is to be reduced, it is more appropriate to adopt reactive voltage division or thyristor voltage regulation circuit. Personally, I feel that it is unreliable and unsafe to use this simple circuit to reduce blood pressure. Electrolytic breakdown of withstand voltage 16V is easy, and Schottky diode of 30A is not cheap.

Repeat: I didn't know it was originally used as a filter in Hi-Fi audio power supply until it was told by emtianshi999 netizens downstairs. ! Although it has never been used, from the point of view of circuit analysis, semiconductor diode, as a non-phase device, is itself a noise source, and the interference of thermal noise and harmonic energy on the circuit can not be ignored, especially in circuits with high current such as power supply, which cannot be filtered by large electrolytic capacitors connected in parallel at both ends of the diode. Usually, a multilevel composite filter circuit consisting of inductance, capacitance and resistance is used to filter out the interference of the incoming power supply of the power grid.