VE-27R-EW-F4

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DC DC converters are necessary components to provide the safe and reliable power conversion in any electrical/electronic system. It aims to convert and deliver the required power, easily and efficiently. From a variety of operating principles, it provides various types of converters with different technical specifications and characteristics to meet the power demand of the end-use application. Taking the VE-27R-EW-F4 DC/DC converter as example, this article will illustrate its application field and working principle.

VE-27R-EW-F4 is a DC/DC converter manufactured by Eaton. With a wide operating temperature range of -40° to +85°C, it is widely accepted and used in different applications as a reliable workhorse. This model is rated for 27W at the input voltage of 9V and output voltage of 12V. It also offers over-voltage, over-temperature and short-circuit protections for improved safety and reliability in real world applications. It features a 1U low-profile package, with 17.85mm height, 104.4mm depth and 40.5mm width, which can save space for different applications. It also offers a high level of efficiency, as high as 84%, which is relatively high when compared to other competing products.

One of the frequently used applications of VE-27R-EW-F4 is telecommunication systems. As many wireless systems require a large number of power supplies, the advantages of VE27R-EW-F4 such as low profile package, high efficiency and wide temperature range make it ideal for the power requirements of these systems. This converter is also used in portable medical equipment, such as blood analyzers and diagnostic equipment, where lightweight, robust, reliable and efficient power sources are essential for portable applications. With its high efficiency and low power consumption, it is also used in battery-operated and automotive systems.

The VE-27R-EW-F4 DC/DC converter works according to its flyback converter operation. The input voltage is stepped up by a power transformer and then switched to the output capacitor. The stored energy is discharged through the diode, inductor, and feedback circuit voltage divider. The inductor also serves to limit the current fluctuation while transferring energy from the input to the output. It is a non-isolated converter which is designed to convert a single input voltage into a specific output voltage.

The primary switching element, a MOSFET, is used to control and switch the current flow between the input and output through the power transformer. When the voltage is applied at the input, the MOSFET is turned on, allowing the current to flow from source to the load through the primary windings of the transformer. The current increases exponentially and stores in the primary winding of the transformer with the changing magnetic field. When the MOSFET is switched off, the field energy is released and transferred to the secondary winding of the transformer. Secondary winding then generates an output voltage which is rectified, filtered and then regulated by the feedback circuit wherein the feedback voltage is compared to a reference voltage, and a control signal is generated from the error amplifier. The control signal then provides the duty cycle information to the MOSFET driver.

To sum up, VE-27R-EW-F4 belongs to DC/DC converter family, and it is widely used in various applications, such as telecommunication systems, portable medical equipment, and battery-operated and automotive systems. The emphasis of this converter is on safety and reliability in real world applications, with its over-voltage, over-temperature and short-circuit protections. It works according to its flyback converter operation, with primary switching element MOSFET and power transformer used to control and switch the current flow, and the feedback circuit is used to regulate the output voltage.

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