source: Electronics Weekly news
Coilcraft’s has introduced a series of current sense transformers, operating up to 40A over 400Hz to 1MHz, and offering 4,000Vrms isolation voltage between the sense and output windings, using insulation reinforced to UL 60950-1.
To minimise power loss, the resistance of the sense coil is very low: 840μΩ in all versions of the series, dubbed CST2020.
Available in four turns ratios 1:70, 1:100, 1:200 and 1:300, they are intended to provide output feedback for load current measurement and control in switching power supplies, over-load protection and short-circuit protection.
AEC-Q200 Grade 1 (-40 to +125°C) qualification means they are suitable for automotive applications such as measurement in traction motor and battery management systems, according to the firm. “Other applications include aerospace power management, three-phase solar inverters, industrial motor controls and other applications requiring high isolation between the sense and output windings.”