What Is a Bridge Diode?
Bridge diodes are rectifiers. Rectifiers are used to convert alternating current (AC) signals to that of direct current (DC). They are also known as full-wave bridge rectifiers because they are able to rectify both the positive and negative parts of the input signal. Bridge diodes are commonly made from four rectifier diodes arranged in a bridge structure.
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Features
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Bridge diodes are bought in packages or modules that have four leads. Two of the leads are for AC inputs, and two are for DC outputs. They can be used for currents as 0.5 amps or as high as 8 amps or more.
Special Features
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Most bridge diodes are made with a molded epoxy casing that sometimes includes integrated metal heat sinks. They may be glass passivated, which means their middle part or PN junction is coated with glass that has tiny particles inside.
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Types
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Some kinds are encased in transistor type packages. Surface mount bridges are used on printed circuit boards. Epoxy TO-5 metal can styles have very long leads. Inline bridges are rectangular with a slant on one of their top sides, and they have holes in the middle for heat sinks.
High-Current Bridge Diodes
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High-current bridge diodes are made for high currents, such as 25 to 50 amps. They may be packaged in square metal cases or plastic and metal cases with holes for heat sinks. One corner is usually slanted at the top.
Uses
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Bridge rectifiers are used as voltage doublers, and they are staples in power supplies. Included are internal ones, such as those used in desktop computers, and external ones, such as adapters.
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