The rectifier bridge is the most commonly used circuit for rectifying by the diode's single-conductivity, and is commonly used to convert alternating current into direct current. So how do we tell if the rectifier bridge is good or bad? The following describes a relatively simple and commonly used method.
Method for determining polarity of rectifier bridge
Before measuring the rectifier bridge, it is necessary to distinguish the polarity of the rectifier bridge interface.
Most of the rectified full bridges are marked with "+", "one", and "~" symbols (where "+" is the positive pole of the rectified output voltage, "one" is the negative pole of the output voltage, and the two "~" are AC voltage input), it is easy to determine each electrode.
Individual rectifier bridge labels that are not identifiable for some reason can be identified in two ways:
1. Appearance discrimination method. The full bridge consists of four diodes with four pins. The connection point of the two diode negative poles is the "positive pole" of the full-bridge DC output terminal, and the connection point of the two diode anodes is the "negative pole" of the full-bridge DC output terminal. Most of the rectified full bridges are marked with the "+", "-", and "~" symbols. (where "+" is the positive pole of the rectified output voltage, "-" is the negative pole of the output voltage, and "~" is the AC voltage input terminal), and it is easy to determine each electrode.
2. Multimeter detection method. If the positive and negative polarity marks of the component are obscured, they can also be detected by a multimeter. When testing, set the multimeter to “R&TImes; 1k†block, connect the black pen to a pin of the full bridge component, and measure the remaining three pins with a red test pen. If the measured resistance is infinite, then the black pen The connected pin is the DC output positive of the full bridge component; if the measured resistance is in the range of 4~l0kΩ, then the pin connected to the black meter is the DC output negative of the full bridge component, and the remaining two The pins are the AC input pins of the full bridge component.
Rectifier bridge measurement method
During the test, the positive and negative resistance values ​​of the "+" pole and the two "~" poles, the "one" pole and the two "~" rectifier diodes can be measured by a multimeter (the same as the measurement method of the ordinary diode). If it is normal, it can be judged whether the full bridge is damaged. If it is determined that the positive and negative resistance values ​​of a diode in the full bridge are both 0 or both infinity, it can be judged that the diode has broken down or open circuit damage.
Some netizens summed up the "one four single pass, two three breaks" seven-character. The idea is to take down the rectifier bridge and use the pointer table RX1K file to detect. One four feet and any foot are single-directional, that is to say, "one four single pass", the two-legged and three-legged measurement will always be disconnected. That is: "two or three off", it is good to meet this condition, and vice versa.
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