CD621215B Discrete Semiconductor Products

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Thyristors, SCRs, and Modules all have their own specific application fields, and they are used in a variety of different applications. The CD621215B is an example of a thyristor that is especially suited for certain specific applications. This article explores the application field and working principle of the CD621215B.

Introduction to the CD621215B

The CD621215B is a Thyristor-based, 600V, 15A two-phase bridge rectifier module, with a 20V DIAC (AC Trigger). It is a part of a family of modules that provide superior rectification performance for various switch mode power supplies. The CD621215B is considered a high-efficiency diode bridge rectifier because of its ability to reduce the power wasted through the rectification process. It consists of two rectifier stages mounted on a high-reliability dielectric carrier.

Applications of the CD621215B

The CD621215B is suitable for a wide range of applications, not only in switch mode power supplies, but also in DC-motor drives, heaters and other AC-DC power supplies. It can also be used in pulsed loads, such as lasers or fluorescent lighting, or in uninterrupted DC power supplies. It is well-suited in applications where high-efficiency rectification is desired, as it is capable of delivering a much higher efficiency than conventional diode bridges.

Working Principles of CD621215B

The CD621215B is able to achieve such high efficiency levels due to its unique working principle. It operates on the principle of phase control rectification, where two halves of a SCR act together to form a full bridge rectifier. This is accomplished by the SCR switching on and off when the voltage across it reaches a predetermined level, which is known as its "trigger voltage". Each SCR half can be turned on and off independently, allowing for efficient utilization of energy from the AC input. The CD621215B also utilizes diodes to form a secondary bridge rectifier, allowing it to efficiently switch between AC and DC power.

In addition, the CD621215B is equipped with a 20V DIAC (AC Trigger). This DIAC is used to provide the SCRs with a controlled voltage drop, allowing for accurate triggering and better control of the STCR. The DIAC also helps to reduce the power losses associated with triggering the SCRs at low-voltage levels, resulting in improved efficiency.

Conclusion

The CD621215B offers superior rectification performance for various switch mode power supplies, as well as other AC-DC applications. Its unique working principle allows for phase control rectification, resulting in a higher efficiency level than traditional diode bridges. The 20V DIAC helps to provide a controlled voltage drop for accurate triggering, as well as reducing power losses associated with triggering the SCRs at low-voltage levels. The CD621215B is an ideal choice for a variety of applications.

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