Gate drivers improve current sharing for dual style IGBT and SiC power modules
Power Integrations’ family of IGBT/SiC module gate drivers targets the dual, 100 x 140mm style of IGBT modules, such as the Mitsubishi LV100 and the Infineon XHP 2, as well as silicon carbide (SiC) variants of up to 2300V blocking voltage.
The SCALE-iFlex LT NTC drivers provide negative temperature coefficient (NTC) data – an isolated temperature measurement of the power module – which enables accurate thermal management of converter systems. This is particularly important for systems with multiple modules arrayed in parallel, ensuring proper current sharing and enhancing overall system reliability, claimed the company.
Thorsten Schmidt, product marketing manager at Power Integrations, said that the SCALE-iFlex approach handles paralleling so expertly that one module in five can be eliminated without loss of performance or current de-rating. He claimed that adding an isolated NTC output reduces hardware complexity – particularly cables and connectors – and contributes to system observability and overall performance.
Based on Power Integrations’ SCALE-2 technology, SCALE-iFlex LT gate drivers are said to improve current sharing accuracy and therefore increase the current carrying capability of multiple-paralleled modules by a claimed 20 per cent, allowing users to increase the semiconductor utilisation of their converter stacks. This is claimed to be possible because the localised control of each 2SMLT0220D MAG (Module Adapted Gate driver) unit ensures precise control and switching, enabling excellent current sharing. Advanced Active Clamping (AAC) is employed to deliver accurate overvoltage protection.
To further increase space saving, up to four MAG-driven power modules can be parallel-connected from a single 2SILT1200T Isolated Master Control (IMC) unit, which can be mounted on a power module. The gate drivers are fully qualified to IEC 61000-4-x (EMI), IEC-60068-2-x (environmental) and IEC-60068-2-x (mechanical) specifications, and undergo complete type testing – low voltage, high voltage, thermal cycling – shortening designer development time by a claimed 12 to 18 months. Protection features are included and parts are available with conformal coating.
SCALE-iFlex LT NTC gate drivers are available for sampling.
