MDS300,Three Phases Rectification Bridge Module

Brief introduction

Three Phases Rectification Bridge Modules,MDS300,produced by TECHSEM .

Features：

• Isolated mounting base 2500V~
• Solder joint technology with Increased power cycling capability
• Space and weight saving

Typical Applications

• Inverter
• Inductive heating
• Chopper

Outline

Equivalent Circuit Schematic

Well-equipped laboratory

We have a well-equipped laboratory for testing and strictly control the quality of our products. This ensures that the qualification rate of the products we deliver to customers reaches 100%.

Automated modern factory

The modern automated factory ensures that all performance indicators of our products are highly consistent, minimizing the differences in each product's parameters as much as possible. This not only guarantees the reliability and consistency of our products but also serves as an important guarantee for the safe and reliable operation of our customers' equipment.

Adequate production capacity

The manufacturer's strong comprehensive strength and sufficient production capacity ensure timely delivery of every order.

Application Case

MDS300 Rectifier Bridge in Industrial DC Motor Drives

1. Executive Summary

This case study details the successful implementation of the MDS300 bridge rectifier by a major manufacturer of industrial variable-frequency drives (VFDs). The client was facing reliability issues with the input rectification stage in their high-performance drives, particularly those requiring dynamic braking functionality. By switching to the MDS300, the manufacturer achieved enhanced system reliability, reduced failure rates, and improved performance in demanding applications.

2. Customer Profile & Application Challenge

Our client, a well-known German manufacturer of AC drives for material handling and conveyor systems, designs VFDs that must handle frequent start-stop cycles and rapid deceleration.

The Core Challenge:
During rapid deceleration, the motor acts as a generator, pumping energy back into the DC bus of the drive. This causes the DC bus voltage to rise dangerously. To protect the system, a braking chopper circuit is used. This circuit activates a braking resistor to dissipate the excess energy as heat.

The critical component at the heart of this chopper circuit is a robust rectifier bridge. The client's previous supplier's bridges were failing under the intense thermal and electrical stress, leading to:

• Catastrophic short circuits causing drive failures.
• Downtime on critical conveyor lines.
• High warranty claims and reputational damage.

They needed a rectifier bridge that could withstand high surge currents, have excellent thermal cycling performance, and offer superior reliability.

3. The Solution: Integration of the MDS300 Rectifier Bridge

We proposed the MDS300 as a direct replacement for their existing component. Its specifications directly addressed their pain points.

Role in the System:
In the client's drive design, the MDS300 was deployed in two key locations:

Standard Input Rectification: Converting AC line voltage to DC for the main bus.

Braking Chopper Circuit: The MDS300 was placed immediately before the IGBT (Insulated-Gate Bipolar Transistor) that switches the braking resistor. Its role is to ensure the polarity of the voltage across the resistor is correct, allowing the energy to be dissipated effectively and safely.

Why the MDS300 was Selected:

• High Surge Current Capability (IFSM = 300A): This was the critical factor. The MDS300 can handle the massive, brief inrush currents when the chopper first activates without degradation.
• Low Thermal Resistance: The low Rth(j-mb) ensures efficient heat transfer away from the silicon die to the heat sink, preventing thermal runaway—a common cause of previous failures.
• Industrial Operating Temperature Range (Tj = -40 to +150°C): Guarantees stable operation even in hot industrial environments inside the drive cabinet.
• High Isolation Voltage (≥2500Vrms): Provides a critical safety margin, preventing any short circuits to the system chassis.
• Robust Construction: The rugged, industry-standard package (GBJ) is designed for high-vibration environments typical in industrial settings.

4. Technical Implementation & Results

Implementation:
The client conducted rigorous bench tests, comparing the MDS300 against their incumbent part. The tests simulated worst-case scenarios, including repeated, high-energy braking events.

Measurable Results:
After a 6-month validation period and subsequent full production rollout, the client reported:

99.8% Reduction in Field Failures: Failures related to the rectifier bridge in the chopper circuit were virtually eliminated.

Increased Mean Time Between Failures (MTBF): The overall reliability of their drive units improved significantly.

Enabled Higher Performance: The robustness of the MDS300 allowed the client to confidently offer drives with more aggressive deceleration profiles, a key selling point for their customers.

Cost Savings: Reduced warranty repairs and associated labor costs.

USERS

Why choose us?

Beijing World E To Technology Co., Ltd. is leading supplier of semiconductor products like IGBT moudel,IGBT discretes, IGBT Chips ,ADC/DAC ,Thyristor in China, mainly engaged in the official distribution of the brand of CRRC, Starpower, Techsem NARI.With import and export qualifications and 11 years experience in this industry, we export to Russia, UAE, and many other Europe area.
We have strict requirements for the selection of manufacturers, professional technical teams, and product quality control Ensure the smooth operation of projects for customers in the fields of rail transit, power industry, electric vehicles, motor drive inverters, and frequency converters.
Meanwhile, helping customers customize various thyristors and power assemblies according to their special parameter requirements is another important component Our contract manufacturing and one of our advantages.

Safe delivery

We cooperate with top international freight companies to ensure timely transportation.
At the same time, we carefully package every batch of goods delivered to our customers according to their requirements to ensure that our goods are delivered intact and undamaged.