R21120

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R21120 Application Field and Working Principle

The R21120 Rectifiers are a series of single rectifiers which are used to convert alternating current (AC) to direct current (DC), providing a solution for applications requiring a high voltage bridge rectifier.

The R21120 series is available with two different surge strengths: 150A and 1000A. This enables the R21120 to serve a variety of applications, from high-efficiency battery chargers to general ASIC protection, with particular advantages in laptop/consumer power applications.

Application of R21120

The R21120 Rectifiers are mainly used in three applications:

• Power converters and AC-DC charger applications. The R21120 can regulate the input AC voltage to the required DC output, even with fluctuating input voltages, providing a clean, continuous supply of DC power.
• Battery-powered devices and emergency lighting. The rectifier allows the battery to get charged precisely, while also protecting it from discharge, thus benefit the performance of the battery.
• Power supplies for industrial control and automation systems. The rectifier provides an efficient, reliable DC power solution for systems where the reliability of AC isn’t guaranteed.

Working Principle of R21120

The R21120 is a single-phase, full-wave bridge rectifier that allows DC current flow in either polarity. It consists of four diodes connected in a bridge configuration. In operation, the input line is connected to the two ends of the bridge, with the other two ends connected to the load. When the input AC line voltage is greater than the load voltage, the diodes provide a low impedance path for current flow in the forward direction. When the AC voltage is less than the load voltage, the diodes provide a high impedance path, reducing power loss and preventing the load voltage from decreasing.

The R21120 also provides temperature compensation. This is important in applications where temperature variation is significant, as the diodes’ forward voltage drop varies accordingly. The R21120 rectifier also has an integrated intelligent periodic reverse-recovery current monitor, which dynamically compensates for any non-linear current management problems. This prevents voltage spikes, ensures steady current supply and maximizes efficiency.

The R21120 rectifier also features a built-in surge protection circuit. This allows the rectifier to exceed its power ratings for brief periods of time, providing protection against inrush current and other transient power issues.

Conclusion

The R21120 Rectifier is an ideal solution for a wide range of AC-DC applications. It features an efficient, reliable design and an integrated surge protection circuit, making it ideal for demanding applications. The R21120 also provides temperature compensation and an integrated intelligent periodic reverse-recovery current monitor, ensuring a clean, noise-free power supply.

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