BU20085S-M3/45 Datasheet/PDFDiodes - Bridge Rectifiers - BU20085S-M3/45 Application Field and Working Principle
Diodes are one of the most common electrical components used in electronics. They are typically used to regulate the flow of electricity. Bridge rectifiers, specifically the BU20085S-M3/45, are semiconductor diodes that are used in many applications including power supplies and audio amplifiers.
Application Field
The BU20085S-M3/45 bridge rectifier is an efficient and economical device used to convert ac input signals to dc outputs, and is used for a wide range of applications including power supplies, motor control circuits, inverters, and audio amplifiers. The BU20085S-M3/45 is also used in automotive and industrial equipment, as well as lighting, security, and medical devices.
The BU20085S-M3/45 is a full-wave bridge rectifier designed for use in applications demanding high efficiency, high surge current capability and high operating temperature ranges. It features exceptional performance in both linear and non-linear applications with low forward voltage drop, high junction capacitance and high surge current capability.
Working Principle
The BU20085S-M3/45 bridge rectifier is a center-tapped full-wave rectifier circuit. It consists of four diodes connected in a bridge configuration. When an ac voltage is applied between the two outer terminals (anode and cathode) of the bridge, the diodes D1, D2 and D3, D4 alternately turn on for half-cycles of the mains voltage. In the first cycle, D1 and D2 are forward biased and conducts, while D3 and D4 are reverse biased and remain in the off-state. As a result, the current flows out of the anode of diodes D1 and into the cathode of diode D2, thus producing a dc voltage at the load. The same process occurs for the second cycle, except that the diodes D3 and D4 are now conducting. As the two half-cycles of the ac voltage are summed together, they produce a dc output voltage.
The BU20085S-M3/45 also provides many other benefits such as elimination of series resistors, low losses, soft-start and end of cycle, and more efficient regulation of the current. It is important to note that the BU20085S-M3/45 is limited to single-phase bridge rectification, and cannot be used for three-phase bridge rectification applications.
Advantages
The BU20085S-M3/45 bridge rectifier offers several advantages over other rectifier circuits, such as reduced losses due to lower RMS current and voltages. The BU20085S-M3/45 also eliminates the need for external series resistors as it produces a lower reverse leakage current and improves power factor. Additionally, the BU20085S-M3/45 produces a higher reverse recovery time and eliminates the need for a load capacitor. The BU20085S-M3/45 also has low heat dissipation and low cost.
Disadvantages
The main disadvantage of the BU20085S-M3/45 bridge rectifier is that it can only be used for single phase bridge rectification, so it is not suitable for three phase bridge rectification applications. Additionally, the BU20085S-M3/45 produces higher output voltage ripple due to the effects of voltage drops and leakage. This can be mitigated by increasing the value of the filter capacitor, however, this increases the cost of the circuit.
Conclusion
The BU20085S-M3/45 bridge rectifier is an efficient and economical device for converting AC input signals to DC outputs. It boasts a number of advantages, including reducing losses due to lower RMS current and voltages, eliminating the need for external series resistors, higher reverse recovery time, low heat dissipation and low cost. However, it is limited to single-phase bridge rectification, so it cannot be used for three-phase applications. Additionally, it produces higher output voltage ripple due to voltage drops and leakage.