Rectifier bridge output voltage calculation

ASEMI Semiconductor Q&A:

ASEMI has 12-year rectifier bridge production experience gives you answers to the problems of rectifier bridge stacks. Many engineers have questions about why the voltage at the output is measured after the rectifier bridge is piled up, and the voltage rises. Explain this phenomenon as follow:

Description of the voltage rise at the output of the rectifier bridge stack

In the circuit design, a large-capacity capacitor is added at both ends of the rectifier bridge. The main function of this capacitor is energy storage and buffering. There is a big pulse at the moment when the power switch is turned off. The main function of this capacitor is to come. To prevent the damage of the circuit by the instantaneous high-energy pulse, however, some engineers have questioned that when measuring the output voltage across the rectifier bridge, the voltage will rise. Many people think that it is the cause of this capacitor. Actually, the voltage at the output of the rectifier bridge is The voltage across the capacitor is the same. The voltage across the capacitor does not rise automatically. It can only be the same as the input. Therefore, the voltage at the output of the rectifier bridge cannot rise. What is the reason?

Explanation of the voltage rise at the output of the rectifier bridge stack

In fact, it should be said that it is a kind of artificial neglect or a defect of the multimeter. Everyone knows that the multimeter can measure AC voltage and DC voltage separately, but it is required to measure DC and AC. The multimeter can only measure DC and sinusoidal AC that do not change in direction and size. Therefore, when measuring the input voltage with a multimeter AC, the accurate voltage value can be measured, but the DC voltage cannot accurately measure the DC voltage at the output. Because the rectification after the rectifier bridge is DC, but the current is changing at any time, the voltage measured by the DC gear is inaccurate and not informative.