KBU8B Discrete Semiconductor Products

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Bridge rectifiers are a type of diode circuit that is widely used to convert alternating current (AC) power from a source, such as a mains power supply, into a direct current (DC) output. Bridge rectifier circuits are constructed using four diodes arranged in the form of a bridge, as shown in the schematic diagram; typically two of the diodes conduct during one half of the AC cycle, and the other two conduct during the other half cycle. The resultant advantage of bridge rectifier circuits is that their output is “pulsating” DC, and contains no net AC component.

A particularly common type of bridge rectifier is the KBU8B (Kilovolt Bidirectional Unidirectional 8th Bridge), which has a voltage rating of up to 800 V DC. The KBU8B is found in power supplies in many electronic goods, such as laptops, televisions and DVD players, and is also ideal for industrial applications. The bridge rectifier is relatively straightforward and reliable; it is one of the most widely used rectifier circuits and is available in a large variety of applications.

The KBU8B bridge rectifier is composed of four diodes arranged in two series arms, as shown in the circuit diagram. The two diodes between the two series arms comprise a “voltage doubler” (Figure A in the illustration below) and the two diodes between the two series arms comprise a “current rectifier” (Figure B in the illustration below). The dashed lines in the circuit diagram represent the voltage or current paths. In an unrectified AC supply, both the positive and negative power line terminals are connected to the two series arms of the bridge rectifier; thus, one series arm comprises the positive power terminal, and the other series arm comprises the negative power terminal.

The KBU8B is connected to the AC supply with two input leads and four output terminals. When power is applied to the input leads, the bridge rectifier functions by passing all the current through either one or another of the two series arms. The particular series arm that is not conducting during the current phase is said to be “reverse biased”. During each phase, the current is passed through the corresponding series arm and then across the bridge rectifier circuit by the two respective diodes, to be returned to the other side of the AC supply. This action is repeated three times for each complete AC cycle, thus creating a complete DC output at the bridge rectifier\'s four output terminals.

The KBU8B bridge rectifier also has the advantage of a low voltage drop across its output. This is because it passes current only through either one or the other of its two arms during the AC cycle, resulting in a lower voltage drop compared to the traditional rectifier which passes current through both the arms during the AC cycle. As the KBU8B bridge rectifier passes current through only one arm at a time, it is also able to regulate the flow of power at a lower voltage than the traditional rectifier.

The KBU8B bridge rectifier is used in many electronic applications, and is particularly useful in switching power supplies where its low voltage drop and greater efficiency are necessary. It is also widely used in inverters and other power conversion applications.

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