60CNQ035

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Introduction

The 60CNQ035 is a three-phase rectifier array produced by ON Semiconductor, designed to rectify AC input voltage quickly and efficiently to DC. Its usual application field is related to high-power motor drives, welding, and uninterrupted power supplies, as it presents an excellent rectification capability, low power dissipation, and fast switching speed. In this article, its application field and working principle will be deeply explained.

Application Field

Having a total of six diodes connected in a positive-negative symmetric configuration, the 60CNQ035 diode array offers high power rectification for both single- and three-phase AC-input applications. As such, it is typically used in high power motor drives, power converters, and electronic welding machines, but also in UPS, solar/wind energy, and related applications that require accurate and secure rectification.

For example, the 60CNQ035 operation is ideal for a simple three-phase 220V AC to DC converter, where the three-phase power source is rectified to DC by this diode array. Batteries, the output of solar/ wind harvesting systems, can also be recharged with the 60CNQ035. Additionally, the diode array has the advantage of presenting a very short reverse recovery time compared to Schottky diodes and other traditional rectifiers.

Working Principle

The 60CNQ035 operates with two power supplies, a regulated 12V and a more powerful 48V. Thus, the rectification efficiency increases with the addition of a secondary rectifier (that can handle higher amounts of current) with the 12V supply, achieving higher efficiency and number of switched cycles within the usual operating temperature range (–55°C to 175°C).

In addition to the 12V power voltage, the 60CNQ035 offers protection against transient reverse-voltage conditions, protection against forward leakage current, and a minimum on-resistance. The forward voltage drop of this rectifier is also considerably low compared to traditional diodes, providing a safer operation.

The current flow during the 60CNQ035 rectification process is usually outputting the 6 diodes of the array in pairs. Thus, the three AC power inputs are combined into one DC output. This has the advantage that the peak currents of the three-phase sources are almost equally balanced in the DC output, reproducing the same conditions of a center-tapped transformer without the actual physical transformer.

Conclusion

In conclusion, the 60CNQ035 diode array presents high-power rectifying capabilities for both single and three-phase AC-input applications, such as motor drives, UPS systems, welding machines, and the recharge of batteries from solar or wind sources. Its features include high efficiency, low power dissipation, and a low forward voltage drop. It also offers protection against transient reverse-voltage conditions, and for higher current applications, it needs an additional secondary rectifier and a 12V regulated power supply.

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