TDK presents two new series of EPCOS SMT current sense transformers for power electronics.
The various types in the B78417A* series are based on EP7 ferrite cores, have compact dimensions of just 10,6 x 12,2 x 11,0 mm and are designed to measure pulse currents of up to 20 A. The maximum DC resistance on the primary winding is 1,9 mΩ.
The parts in the B78419A* series are designed with EP10 ferrite cores. These components have dimensions of 12,8 x 13,6 x 14,4 mm and their measurement range extends up to 30 A. The DC resistance is just 0,5 mΩ.
Each series is available with a variety of turn ratios: while the EP7-based transformers are available in four versions with turn ratios of between 1:50 and 1:125, the EP10 transformers offer five versions with turn ratios of between 1:50 and 1:180. The permissible operating temperature range extends from -40°C to +150°C. The transformers are suitable for measuring currents in the frequency range from 50 kHz to 250 kHz.
Possible applications include switch-mode power supplies and all types of converters. The test voltage between the primary and secondary sides is 2400 V a.c. and the creepage distances meet the requirements for basic insulation according to IEC 60664. As the components are qualified to AEC-Q200, they can also be used in xEV applications, e.g. for measuring the currents in DC-DC inverters.
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