ISO7221CQDRQ1 Isolators

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Introduction

ISO7221CQDRQ1 is an integrated digital isolator technology developed by Schneider Electric. ISO7221CQDRQ1 digital isolators are utilized primarily in protecting high-voltage industrial systems from EMI/RFI, eliminating ground loops, and providing line filtering to reduce high-frequency noise from the power supply. The isolator transfers digital signals across an electrical isolation barrier. ISO7221CQDRQ1 technology offers a low-cost solution that can be implemented in a range of industrial applications, including those found in power generation, motor control, industrial automation, instrumentation, and communications.

Application Field

The ISO7221CQDRQ1 technology is best suited for applications that require protection against unwanted electromagnetic interference (EMI)/radio-frequency interference (RFI). This includes, but is not limited to, power generation, motor control, industrial automation, instrumentation, and communications. Efficiency, performance, reliability, and space savings are also key considerations when selecting the ideal digital isolator solution. The ISO7221CQDRQ1 technology can be applied in a wide variety of applications, such as power supplies, motor drive, LED lighting, medical devices, railway and traction systems, automotive infotainment systems, and HVAC systems.

The ISO7221CQDRQ1 digital isolator is designed to be used in AC power and DC motor control applications. The ISO7221CQDRQ1 isolator provides isolation from a high to a low voltage. In addition, it supports up to fifty-five (55) channels of I/O, with each channel rated for ten to two thousand (10 to 2000) volts. This isolator can also support various data transfer speeds, from fifteen milliseconds up to one hundred and fifty milliseconds.

Working Principle

The ISO7221CQDRQ1 digital isolator utilizes a transformer coupled design. It employs a core with two separate windings and transfers signals across an electrical isolation barrier. The primary and secondary windings are inductively coupled via an isolation barrier that prevents the primary from influencing the secondary. The transformer is then connected to ground, making it possible to provide galvanic isolation while sending signals over the transformer itself, without the need for any electrical connection. The primary winding is connected to the power source and receives electrical signals, while the secondary winding is connected to the load and sends out the received electrical signals.

The ISO7221CQDRQ1 design incorporates a passive filter module and a diode bridge to ensure high isolation levels. The filter module helps to reduce unwanted radio frequency interference, while the diode bridge acts as a short-circuitor, absorbing any electrical spikes transmitted over the primary winding. Furthermore, the ISO7221CQDRQ1 digital isolator also incorporates a galvanic separator, which is an insulative sheet of plastic that separates the primary and secondary windings, ensuring that they remain electrically isolated.

Conclusion

The ISO7221CQDRQ1 digital isolator is a cost-effective solution that can provide strong electric power isolation and protection. It is ideal for applications that require more than fifty (50) channels of I/O and can support up to two thousand (2000) volts. By offering improved efficiency, performance, reliability, and space savings, the ISO7221CQDRQ1 digital isolator is the ideal choice for power generation, motor control, industrial automation, instrumentation, and communications applications.

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