How to distinguish the quality of rectifier bridge?

How to distinguish the quality of rectifier bridge?

As a power component, rectifier bridge is widely used in various power equipment. A rectifier bridge is the most commonly used circuit that utilizes the unidirectional conductivity of diodes for rectification, commonly used to convert alternating current into direct current. So how to distinguish the quality of rectifier bridge.

If individual rectifier bridge markings cannot be identified for certain reasons, the following two methods can be used to distinguish them: 1. Appearance discrimination method. The full bridge consists of four diodes with four pins. The connection point of the negative terminals of the two diodes is the "positive terminal" of the full bridge DC output terminal, and the connection point of the positive terminals of the two diodes is the "negative terminal" of the full bridge DC output terminal. Most rectifier bridges are marked with symbols such as "+", "-", and "~". (where "+" is the positive pole of the rectified output voltage, "-" is the negative pole of the output voltage, and "~" is the input terminal of the AC voltage), it is easy to determine each electrode.

2. Multi meter testing method. If the positive and negative polarity markings of the component are blurred, a multimeter can also be used to test it. When testing, set the multimeter to the "R × 1k" position, connect the black probe to one of the pins of the full bridge component, and use the red probe to measure the other three pins separately. If the measured resistance values are all infinite, then the pin connected to this black probe is the positive DC output terminal of the full bridge component; If the measured resistance values are all within the range of 4-10k Ω, then the pin connected to the black meter is the negative DC output pin of the full bridge component, while the other two pins are the AC input pins of the full bridge component.

When testing, the positive and negative resistance values of each rectifier diode between the "+" pole and the two "~" poles, and between the "one" pole and the two "~" poles can be measured separately with a multimeter (using the same measurement method as ordinary diodes) to determine whether the full bridge is damaged. If the forward and reverse resistance values of a diode in the entire bridge are both zero or infinite, it can be determined that the diode has broken down or is open circuit damaged.