KBU3501-G

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Diodes - Bridge Rectifiers have become increasingly commonplace in many modern applications ranging from consumer to industrial systems. The KBU3501-G is a high-performance rectifier module that features a novel design to enable its use in diverse applications with notable features such as low forward voltage drop, low reverse leakage current, and fast switching characteristics. This article takes an in-depth look at the application fields, as well as the working principle behind the KBU3501-G.

Application Field

The KBU3501-G is designed for use in AC-to-DC circuits and rated for a repetitive peak reverse voltage of up to 1600V. Common applications include single phase and three-phase rectification, power line filter or load change circuits, as well as photovoltaic arrays. Its low power ratings also make it suitable for switching power supplies. It also offers built-in protection features, including over-temperature, over-voltage and surge current protection.

Due to its low voltage drop and fast switching characteristics, the KBU3501-G can be used in a wide variety of applications, including LED lighting and LED streetlight applications, automotive audio systems, DC-DC converters, motor control circuits, and solar energy conversion power supplies. It is also suitable for use in building environment controllers, outdoor sensor modules, and industrial controllers.

Working Principle

The KBU3501-G is a four-diode bridge rectifier module. The rectifier uses four diodes (typically of the 1N4007 type) connected to form a bridge circuit. The four diodes act as a switch, allowing current to flow through the rectifier only when the positive cycle of the AC voltage source (i.e. the rectifier output) is present. When the positive cycle of the AC is interrupted, the diodes switch off and the current flow stops.

The bridge rectifier is designed to efficiently convert alternating current to direct current. The output from the rectifier consists of a series of direct current pulses, with small ripple due to the characteristic capacitor filtering. The diodes allow for rectification of both positive and negative half-cycles of the AC input, enabling a higher efficiency than single-phase rectification.

The direct current produced by the bridge rectifier is dependent on the forward voltage drop of the diodes. The KBU3501-G provides a low forward voltage drop of just ≤0.56V, while the reverse leakage current is ≤5µA. Additionally, its fast switching characteristics provide increased efficiency in circuits requiring higher switching frequency.

The KBU3501-G is also designed with surge current and over-temperature protection features. Its built-in temperature sensing circuit monitors the diode temperature, automatically decreasing the nominal current if the temperature rises above the maximum operating temperature. Its inrush current limiting also ensures long-term reliability and longevity.

In summary, the KBU3501-G is a high-efficiency rectifier module designed for a wide range of applications. It features low forward voltage drop, low reverse leakage current, and fast switching characteristics, along with surge current and over-temperature protection features. Its low power ratings make it suitable for use in small-scale circuits and its flexibility makes it suitable for use in numerous applications including lighting and motor control.

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