Application scheme of Mingxin Technology's 300W 24V to 24V isolated waterproof DC - DC power supply

With the intelligent development of railway rail transit, urban rail trains, and high-speed rail systems, the number of onboard electronic devices is constantly increasing, placing higher demands on power systems.Stability, safety, anti-interference ability and environmental adaptabilityHigher requirements have been placed on the train control and management system (TCMS), passenger information system (PIS), onboard lighting, air conditioning control units, communication equipment, and signaling modules, which are typically based on...24V DC power supply architectureHowever, voltage fluctuations in the vehicle's electrical grid, impact loads, and electromagnetic interference (EMI) can severely affect system reliability.

Mingxin Technology launchedMDE300-24S24A product designed forRailway rail transit vehicle-mounted systemDesign300W 24V to 24V Isolated IP65 Waterproof DC-DC Power ModuleThe product adoptsFully sealed aluminum alloy heat dissipation casing,haveHigh power, wide input voltage range, electrical isolation, low ripple, strong immunity to interference, fast dynamic response, and high reliability protection.It is ideal for providing a stable power supply for train control systems, passenger information systems, lighting systems, and air conditioning control units.

Why does railway rail transit require an isolated 24V DC-DC power supply?

In railway train systems, a typical power supply architecture is usually as follows:

• Vehicle main power supply → 24V DC bus

• 24V bus → Independent power supply for each subsystem

24V is mainly used for:

• Train Control and Management System (TCMS)

• Passenger Information System (PIS)

• Vehicle LED lighting system

• Air conditioning control unit

• Vehicle communication equipment

• Sensors and signal processing modules

During train operation, transient voltage surges and electromagnetic interference are generated by the traction system, motor starting, regenerative braking, and electromagnetic braking. Using a non-isolated power supply may lead to:

• TCMS false alarm fault

• PIS display error

• Lighting flickering or malfunctioning

• Air conditioning control system restart

Therefore, in the field of rail transit, the following approach is recommended:

24V to 24V isolated DC-DC power supply moduleThis achieves electrical isolation, interference immunity, and stable power supply.

II. Typical Applications of MDE300-24S24 in Railway Rail Transit

This power supply can be widely used in:

• Train Control and Management System (TCMS): Ensure stable operation of the control unit

• Passenger Information System (PIS)Powering vehicle-mounted displays and broadcasting systems

• Vehicle LED lighting systemProvides stable voltage and avoids flickering.

• Air conditioning control unit: Ensure the reliable operation of the temperature control system

• Vehicle communication systemProvide clean power for data transmission equipment

• Signal Acquisition and Sensing SystemEnhance anti-interference capabilities

ThatFast dynamic responseIt has the capability to maintain a stable 24V voltage when the train accelerates, decelerates, or experiences sudden load changes, thereby improving the overall system reliability.

III. Core Electrical Parameters of the Product

IV. Core Technology Highlights and Advantages

✅ Wide voltage input to adapt to fluctuations in the vehicle's electrical grid.

support18–36VDC wide input rangeIt can cope with voltage fluctuations in the train power grid, cable voltage drops, and transient impacts.

✅ Low ripple, low noise output

built-inWideband noise filter circuitIt effectively suppresses electromagnetic interference (EMI) and ensures the stable operation of TCMS and PIS systems.

✅ Input/output high-voltage isolation

The high isolation voltage design effectively suppresses surges, spikes, and common-mode interference, protecting the safety of train electronic equipment.

✅ High efficiency and excellent heat dissipation

The all-aluminum alloy casing facilitates heat dissipation and supports natural cooling. Radiators are optional and it is suitable for enclosed vehicle electrical cabinets.

✅ Fast dynamic response

It can maintain a stable 24V output during train start-up, stop-start, sudden load changes, or emergency braking, thus preventing system restart.

V. Comprehensive electrical protection mechanism

• Input undervoltage protection

• Input overvoltage protection

• Output overcurrent protection

• Output short circuit protection

• Over-temperature protection

• Input/output electrical isolation protection

Ensure the long-term, safe, and stable operation of the rail transit system.

VI. IP65 waterproof design, suitable for the harsh environment of railways.

Common environments for rail transit equipment include:

• High-temperature sealed electrical cabinet

• Vibration and shock environment

• Damp or coastal railway lines

• High dust tunnel environment

MDE300-24S24 adoptsEncapsulation and fully sealed structure,achieveIP65 protection ratingIt has dustproof, moisture-proof and shockproof capabilities, which significantly improves the reliability and service life of the power supply.

VII. Meets international safety standards

The product design conforms to:

• UL1950

• IEC950

This facilitates the train's overall system passing international safety certifications and railway standard testing.

VIII. Mingxin Technology's Customization Advantages in the Field of Rail Transit Power Supplies

• Input voltage, current, power and dimensions can be customized.

• Provides enhanced EMI/EMC immunity design

• Supports shockproof, moisture-proof, and salt spray-proof reinforcement.

• Provide OEM/ODM and non-standard power supply development

• Sample testing and engineering selection support are available.

IX. About Guangdong Mingxin Technology Co., Ltd.

Guangdong Mingxin Technology Co., Ltd., located in Dongguan Gaosheng Industrial Park, is a high-tech enterprise specializing in the research and development and manufacturing of AC/DC modular power supplies, DC/DC modular power supplies, railway power supplies, industrial control power supplies, and new energy power supplies. Its products are widely used in rail transit, industrial automation, new energy, communication equipment, and intelligent manufacturing.

GetMDE300-24S24Technical data

If you are forRailway train control system, passenger information system or onboard electrical systemSearch24V to 24V isolated waterproof DC-DC power supply modulePlease feel free to contact Mingxin Technology engineers to request [documents/resources].MDE300-24S24 Complete datasheet and selection scheme.