We have developed a fail-safe thin-film current sensor using a flux saturable ring core. The sensor consists of a transformer unit composed of a saturable core, primary and secondary coils, and a load coil which surrounds the transformer unit. The sensor is suitable for the purpose of a fail-safe system. The chip size is 4mm × 4mm. A transmission efficiency of 60% was obtained when the carrier signal was 3Vpp-lMHz sine wave. The secondary voltage of the sensor successfully dropped by 90% when a 100mA load current was applied to 20-tum load coil.
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