Introduction

A DC-DC Converter is a device that functions to convert DC power from one voltage to another. RP40-243.3SFR/N-HC is a DC-DC Converter whose application and working principle will be discussed in this article.

Application Field

RP40-243.3SFR/N-HC is a compact DC-DC converters which feature a wide 4-50VDC input voltage range and wide 9-60VDC output voltage range. Specifically designed for railway onboard applications, RP40-243.3SFR/N-HC operates from -40°C to +70°C and provides up to 2400W output power. Structure-wise, RP40-243.3SFR/N-HC is rugged, shock and vibration resistant, and can work in extreme temperatures and humid environment with high efficiency and reliability, all thanks to its built-in active bleeder circuit, passive thermal control circuit and isolation capacitors. This device is suitable for railway vehicles, such as locomotives, passenger cars, metros and regional trains in order to secure a stable DC power.

Working Principle

RP40-243.3SFR/N-HC functions using an isolated power switch that derives DC power, transforms it into AC power, and then converts it back into DC power with required voltage, all under the control of an internal microcontroller. The working principle of this device can be broken down in the following stages.
First, the device receives 4-50VDC from a DC power source, such as a rectifier/filter switch or a diesel engine. The power within the device is then isolated and transferred to the device’s power switch, where the voltage is converted into a high-frequency AC voltage in order to raise the voltage level to a much higher voltage.
Next, the high-frequency AC power is sent to a transformer or high-frequency choke coil to be further converted into a lower frequency AC voltage. The AC voltage is then sent to a passive rectifier to be rectified into DC voltage with required voltage.
Lastly, the DC power is sent to a capacitor and filter circuit in order to increase the accuracy and stability of the power, and then the output power is available at the output interfaces of the device.

Conclusion

RP40-243.3SFR/N-HC is a DC-DC Converter specifically designed for railway onboard applications. It is a compact solution that is suitable for railway vehicles and is designed to work in extreme temperatures and humid environment with a wide input/output voltage range and high output power. This device functions by converting DC power to AC power and then rectifying it back to DC power with required voltage.