VE-JNF-MW-S

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DC-DC converters are used to convert direct current (DC) power from one voltage to another. This is accomplished by changing the input voltage into a higher or lower one in order to suit the requirement of different electric loads. In this paper, we focus on the application field and working principle of DC-DC converters such as Voltage Employee-Junction Negative Feedback (VE-JNF-MW-S).

VE-JNF-MW-S is an isolated full-bridge DC-DC converter, suitable for voltage conversion applications with wide input voltage ranges and medium power levels. It consists of two parts, the first part is an isolated voltage transformer and the second part is a full-bridge converter, feeding it\'s output into the transformer\'s primary. The transformer creates a negative feedback loop with the output of the converter, enabling robust line and load regulation.

In its application field, VE-JNF-MW-S is suitable for wide input voltage range such as 24V to 72V, and output power level up to 250W. It is widely used in telecommunication, automotive and industrial DC power systems for various voltage conversion. There are some advantages for VE-JNF-MW-S. It exhibits excellent power conversion efficiency and transient line/load regulation, making it suitable for a wide range of applications. It also produces low input current distortion and offers a wide temperature range operation.

VE-JNF-MW-S working principle is based on an isolated voltage transformer and a full-bridge converter. The transformer serves as a variable yet transformer-coupled negative feedback loop connected between the output of the converter and the input of its power transistor switches. To enable voltage regulation and dynamic load stability, the transformer is wound in multiple segments and includes an auxiliary winding to adjust the current flow. When changes in load current occur, the transformer output voltage decreases. This results in a higher voltage applied to the gate of the power transistors, ensuring the current loop remain stable.

The DC-DC converter employs pulse width modulation (PWM) technique to control the converter\'s output. The PWM signal is generated by a voltage-controlled oscillator (VCO) in which the input voltage is proportional to the transformer output voltage. As the transformer output voltage decreases, the VCO frequency increases, causing the output to decrease. This closed-loop control enables wide-range line and load regulation.

VE-JNF-MW-S is a highly versatile DC-DC converter, offering high efficiency conversion, wide input voltage range, adjustable output voltage, current loop stability, and wide temperature range operation. With its many advantages and application areas, VE-JNF-MW-S can serve as an important part of any DC-DC power conveying system.

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