High Isolation DC-DC And Toshiba Intelligent Gate Driver In Motor Systems

High isolation DC-DC and Toshiba intelligent gate driver in motor systems

Applications of Murata high isolation DC/DC converters and Toshiba intelligent gate drivers in motor systems

In the design of high power and high speed motor systems, choosing the right power conversion solution is crucial. Murata's high isolation DC/DC converter series, especially the MGJ series, and Toshiba's intelligent gate driver optocouplers, especially the TLP5214A, demonstrate their excellent technology and application value in this field.

Bridge configuration in motor systems

The commonly used bridge configurations in motor systems (such as half-bridge, full-bridge, or three-phase configurations) require reliable power management. The switching devices in these configurations, such as IGBTs or MOSFETs (including SiC and GaN), operate at high voltage and high frequency, requiring isolation between their gate drive PWM signals and drive power rails and ground lines to ensure system stability and safety.

Importance of high isolation DC/DC converters

To prevent the influence of high dV/dt switching nodes and reduce coupling capacitance, high isolation DC/DC converters resist local discharge effects through robust isolation barriers, ensuring long-term performance stability. The compact design of these converters saves board space and development time.

High isolation DC/DC converters designed for gate drive applications

Murata has introduced a series of high isolation DC/DC converters designed for gate drive applications, especially the MGJ series, to meet the common high isolation requirements in motor drives and inverters. These converters are designed to provide stable voltage and isolation for the "high-side" gate drive of bridge circuits. The MGJ series products are able to maintain constant load and provide stable output during IGBT/MOSFET switching. Their performance during power-on and power-off is also crucial to prevent device damage.

The MGJ series converters from Murata are suitable for various applications, including motor drive/motion control, solar inverters, UPS, alternative energy, high-power AC-DC conversion, traction, electric/hybrid vehicles, and welding, among others. These converters, with their asymmetric output voltage and patented technology, provide optimized drive levels, system efficiency, and EMI performance.

The MGJ6 series converters from Murata have a 14mm creepage distance and electrical clearance, making them suitable for reinforced isolated gate driver power supply applications in 690V AC industrial electrical distribution systems. The MGJ6 series converters have a rated power of 6W and offer a wide 2:1 input voltage range. The output voltage options include 15/-10V, 20/-5V, and 15/-5V, making them suitable for power applications requiring up to 3kV DC-DC link voltage.

Toshiba Intelligent Gate Driver Optocoupler TLP5214A

Toshiba's TLP5214A is an intelligent gate driver optocoupler with a built-in IGBT non-saturation (VCE(SAT)) detector. It is suitable for IGBT saturation monitoring according to method (c), active mirror clamp, and fault signal feedback. TLP5214A provides excellent performance and stability, especially in terms of transient pulse noise during switching and non-saturation periods. Additionally, it helps minimize the design workload of peripheral circuits, reduce external components, and decrease PCB area.

Technical Features of TLP5214A

TLP5214A is an advanced, highly integrated 4.0A output current GBT gate driver optocoupler with wide creepage distance and gap in an SO16L package.

● Peak output current: up to 4.0 A (maximum)

● Operating temperature range: -40 to +110°C

● Supply current: 3.8 mA (maximum)

● Supply voltage: 15~30V

● Value input current: 6 mA (maximum)

● Propagation delay (tpLH/tpHL): 150 ns (maximum)

● DESAT leading edge blanking time: 1.1 us (typical)

● Common mode transient immunity: up to 35 kV/us (minimum)

● Isolation voltage: 5,000 Vrms (minimum)

● Safety standard UL certification: UL1577, file number E67349

● UL approval: CSA (Component Acceptance Service) number 5A, file number E67349

● Option (D4) VDE: DIN EN60747-5-5EN60065 or EN60950-EN62368-1

● CQC: GB4943.1 and GB8898 Japan Factory (application in progress)

When EN60747-5-5 certification type is required, please specify "Option (D4)".

Protection Mode

When TLP5214A enters protection mode, the FAULT output LED on the feedback side will light up, and the FAULT terminal output will switch from high level to low level to indicate IGBT error. If the protection mode continues, the FAULT output LED on the secondary side will also light up, and a current of approximately 10mA will start flowing between VCC2 and VE terminals, thereby increasing power loss on the secondary side. When the protection mode is activated, the system must be immediately shut down and restarted (see Figures 3.7 and 3.8).

Figure 3.7 Internal circuit diagram (operating path in case of failure)

Figure 3.8 TLP5214A sequence diagram (protection enabled)

Application Areas of TLP5214A

TLP5214A is suitable for direct driving of medium-power IGBTs and power MOSFETs, and is widely used in AC servo systems, general inverters, power regulators for solar and wind power generation systems, and other FA devices. The features of TLP5214A make it an ideal choice for medium-power IGBTs and power MOSFETs, ensuring system stability and reliability.

Integrated Applications

By combining Murata's high-isolation DC/DC converters with Toshiba's TLP5214A intelligent gate driver optocouplers, motor system designers can achieve higher efficiency and performance wh

ile reducing overall system costs and complexity. This technology combination provides advanced solutions for motor control, addressing the challenges of high power, high speed, and high isolation requirements.

Conclusion

Murata's high-isolation DC-DC converter series and Toshiba's intelligent gate driver optocoupler (TLP5214A) play a crucial role in enhancing stability and safety in motor systems. They are not only technologically advanced but also provide essential support in ensuring the stability and safety of motor system operation, making them an ideal choice for motor drive application development. From motor control to industrial power installations, these advanced technological solutions ensure optimal performance and the highest safety standards for systems.