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Medha offers a wide range of auxiliary converters that are used for powering auxiliary loads in Diesel / Electric Locomotives, EMUs, DMUs and Metros. Typical loads involved are a combination of blowers, pumps, compressors, lighting, fans, air-conditioning (HVAC), battery charging and auxiliary power required by other sub-systems.

Current product offering has a wide selection of input power type such as AC power from auxiliary winding of traction transformer, DC power from Alternators (rectified) / Traction Converter or battery banks. Offered converters are available for range of power rating from 2.5 kVA up to 300 kVA with combination of AC and DC outputs for different loads.

Typically the input power is processed through a converter stage to provide a stable and controlled DC bus voltage. The output can be another DC stage (with or without galvanic isolation) or an AC inverter with regulated output to handle different AC loads with varying voltage, frequency and power.

Auxiliary Converters also vary by type of cooling and mounting offered. From natural convection cooling to forced air cooling using extrusion heat sinks or heat pipe based sinks to water cooled heat sinks and from under-frame mounting to on-board systems. Type of cooling and mounting selection is based on customer preference, availability of space, auxiliary power and availability of filtered cooling air / water.

Typically IGBT switching devices are used with Thyristors, power diodes and MOSFETs used in specific applications. Polypropylene capacitors are used for improved life and ripple handling capabilities. Magnetics (transformers and inductors) are used where required based on isolation and harmonic filtering requirements. Various sensors (voltage, current, temperature) are used for control, monitoring and protection purposes. Optic fiber communication is used where required for electrical noise immunity. Overall control is implemented using state of the art DSPs or microcontrollers. Complete Auxiliary Converter is typically type tested to latest IEC standards such as IEC-61287, IEC-60571, and IEC-61373.

As an OEM experienced with design and supply of wide range of Auxiliary Converters, we can adopt existing designs or design new products to provide an optimized solution for varying applications. We believe in providing our customers with customized products that serve their objectives which are typically a combination of power rating, location, cooling method, input / output voltage, type of loads, harmonic distortion requirements, isolation and protection requirements.

50 kW for Metro Cars


500 - 1000 V DC to 415 V AC (3ph)
Natural Air Convection Cooled

100 kVA for Metro Cars

500 - 1000 V DC to 415 V AC 3 ph
Natural Air Convection Cooled

2.5 & 5 kVA for Passenger Coaches

110 V DC to 230 V AC 1 ph Natural Air Convection Cooled

25kVA for AC Coaches

110 V DC to 415 V AC 3 ph Natural Air Convection Cooled

125 kVA for Electric Multiple Unit

1800 V DC to 415 V AC 3 ph Forced Air Cooling

300kVA (132 X 3) for Electric Locomotive

660 - 1240 V AC (1ph) to 415 V AC (3ph) Forced Air Cooling

180 kVA for Electric Locomotive


570 - 1140 V AC (1ph) to 415 V AC (3 ph) 162 kVA Forced Air Cooled

Vision & Mission

To be World Leader in Railway Products

Enjoying Innovation and Applying Technology for improving the lives of people.
Enhancing the image of India in the world, in high technology.


R & D Centre

MEDHA SERVO DRIVES PVT. LTD. 2-3-2/A,
Behind Mint Compound, Cherlapally, R.R.Dist,
Hyderabad - 500 051 Telangana, India.
Phone: +91-40-6723 7000; Fax: +91-40-2726 4144

Corporate Identity Number:  U31103TG1984PTC004436

REGISTERED OFFICE:
MEDHA SERVO DRIVES PVT. LTD. P-4/5B, IDA, Nacharam, Hyderabad - 500 076 Telangana, India
Phone: +91-40-2717 1101; Fax: +91-40-2715 4706