Application scheme of Mingxin Technology's 300W 110V to 12V isolated waterproof DC - DC power supply

Introduction: The High Reliability Requirements of Rail Transit Power Systems

With the rapid development of urban rail transit, high-speed railways, subways, light rail, trams, and intercity trains, onboard electrical systems are becoming increasingly important.Intelligent, digital, highly integrated and highly reliableDirectional evolution.

In railway rail transit power supply systems, common DC bus voltages include110VDC、72VDC、96VDCAnd so on, while key equipment such as onboard communication equipment, signaling systems, control units, lighting systems, monitoring systems, PIS (Passenger Information System), and TCMS (Train Control Management System) typically requireStable 12V DC power supply。

In complex electromagnetic environments, strong vibrations, high temperatures, humidity, dust, and vehicle-mounted environments with large voltage fluctuations, ordinary power supplies are difficult to meet the requirements for long-term stable operation.

Mingxin Technology MDG300-110S12A product designed forRailway rail transit applicationsDesign300W 110V to 12V Isolated IP65 Waterproof DC-DC Power Module,haveWide input voltage range, low ripple, strong isolation, high efficiency, high reliability, and excellent heat dissipation.It can operate stably in harsh rail transit environments, ensuring the safety and reliable power supply of the train's electronic systems.

1. Why does rail transit require a 110V to 12V isolated power supply?

A typical onboard power supply architecture for rail transit vehicles is as follows:

• 110VDC vehicle main power bus

• 110VDC → 12VDC converter for critical electronic systems.

12V is mainly used for:

• TCMS (Train Control Management System)

• PIS (Passenger Information System)

• Vehicle monitoring and video system

• LED lighting in the carriage

• Wireless communication equipment

• Driver's cab control panel

• Sensors and signal modules

• Data recording and storage devices

• Gate control system control unit

During train operation, power grid fluctuations, motor starting, brake feedback, electromagnetic interference, lightning surges, and other issues frequently occur. Without a highly isolated and stable power supply, the following may occur:

• Communication interruption

• Control system restart

• Surveillance footage lost

• abnormal signal data

• Equipment damage

Therefore, the rail transit industry generally requires the adoption of:

110V to 12V high isolation, high reliability, waterproof, dustproof, and vibration-resistant DC-DC power module

II. Typical Applications of MDG300-110S12 in Rail Transit

The MDG300-110S12 can be widely used in:

• City subway trains

• Light rail and tram

• high-speed trains

• Intercity trains

• Rail engineering vehicles

• trackside signaling equipment

• Vehicle communication system

• Vehicle-mounted video surveillance system

ThatRapid dynamic response capabilityIt can maintain a stable 12V output during train acceleration, braking, equipment start-up and shutdown, and voltage transients, thus preventing power loss in critical systems.

III. Core Electrical Parameters of the Product

Available versions:

• Input voltage range:9V – 154V

• Power range:200W – 350W

• supportSingle or multi-channel output customization

IV. Core Technology Highlights and Advantages

✅ Ultra-wide input voltage range to adapt to fluctuations in rail power grid

Input range66–154VDCIt can cover common track voltage standards and adapt to complex working conditions such as power grid fluctuations, cable voltage drops, and train braking energy feedback.

✅ Low ripple, low noise output

built-inWideband noise filterIt effectively suppresses EMI/EMC interference, ensuring the stable operation of communication systems, monitoring systems, and controllers.

✅ High-voltage isolation protects critical equipment.

Input and output are connected usingHigh isolation voltage designIt effectively blocks surges, spikes, and common-mode interference, improving system safety and reliability.

✅ High efficiency & excellent heat dissipation

The all-aluminum alloy casing with heat dissipation fins supports natural cooling and can be equipped with an external heat sink, making it suitable for enclosed vehicle compartments and cabinet environments.

✅ Fast dynamic response

It can handle transient load changes such as train starting, braking, and equipment start-up and shutdown, maintain a stable 12V output, and avoid system abnormalities.

V. Comprehensive electrical protection mechanism

The MDG300-110S12 features multiple intelligent protections:

• Input undervoltage protection

• Input overvoltage protection

• Output overcurrent protection

• Output short circuit protection

• Over-temperature protection

• Input/output electrical isolation protection

Ensure long-term stable operation and reduce maintenance costs.

VI. IP65 waterproof and dustproof, suitable for harsh track environments.

Rail transit equipment may face the following challenges:

• High humidity environment

• Dust and metal particles

• Strong vibration

• High-temperature cabinet

• Outdoor installation scenarios

MDG300-110S12 adoptsEncapsulation and fully sealed structure,achieveIP65 protection ratingIt can work stably in both outdoor and vehicle environments.

VII. Flexible customization capabilities to meet different track design requirements.

Mingxin Technology can provide:

• Input voltage9V–154Vcustom made

• power200W–350Wcustom made

• Multi-outputcustom made

• Custom sizes and installation methods

• Enhanced EMI/EMC design to meet railway standards

8. Meets international safety standards

The product design conforms to:

• UL1950

• IEC950

This facilitates the entire machine's passage through international certification and railway industry testing.

IX. Advantages of Mingxin Technology in the Field of Rail Transit Power Supply

• Focus on industrial and rail power supply R&D

• Supports sample testing and system validation

• OEM/ODM customization available

• Provide power supply selection and technical support

• Long-term stable supply capacity

10. 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, rail transit power supplies, industrial power supplies, and new energy power supplies. Its products are widely used in rail transit, industrial automation, intelligent robots, communication equipment, new energy systems, and other fields.

Obtain MDG300-110S12 technical data

If you are forRail transit, train control system, onboard communication equipment, signaling system or onboard monitoring systemSearch110V to 12V isolated waterproof DC-DC power supply modulePlease feel free to contact Mingxin Technology engineers to obtain a complete datasheet and application solutions.