What is the principle of this power supply rectification method and what are its advantages?

Aguilera

What is the principle of this power supply rectification method and what are its advantages? [Copy link]

As shown in the figure below, what is the reason for this kind of power supply rectification method and what are its advantages?

maychang

D1~D4 and C1C2 form a typical voltage doubler rectifier circuit. Using two diodes in series may be because the reverse withstand voltage of one diode is not high enough.

maychang

However, the left side of the transformer is a typical push-pull circuit, which belongs to the forward type. The voltage doubler rectifier may not be very suitable for use in forward switching power supplies.

PowerAnts

Fixed ratio non-regulated, no problem! Vicor has many modules with this function. The original side of the original poster's circuit must be added with peak current limiting

Aguilera

PowerAnts posted on 2022-3-16 15:10 Fixed ratio non-regulated, no problem! Vicor has many modules with this function, the original side of the original poster's circuit must be added with peak current limiting

Is it necessary to add peak current limiting on the primary side?

Why?

hjl2832

Isn’t this the circuit of the classic mousetrap grid?

okhxyyo

hjl2832 posted on 2022-3-16 19:25 Isn't this the circuit of the classic mousetrap grid?

Can you tell me in detail?

Gen_X

Since the impedance of C1C2 is relatively high for the frequency used, the output short-circuit discharge will not cause too much overcurrent on the primary side, that is, peak current limiting protection is not required in this application.

Of course, this small current change on the primary side can be used to detect and alarm "there is a mouse", reminding you to deal with the mouse quickly to prevent it from escaping or long-term "short circuit" and affecting the next action.