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Current Sense Transformers
For cost-critical applications
SIRIO's current sense transformers are based on a patented coil former in which an e-ferrite core is inserted. The primary winding consists of a single turn. The number of secondary windings depends on the operating frequency and the core material. A voltage is generated at the secondary winding which is proportional to the input current. The typical application is overcurrent protection on the primary side of transformers in switching power supplies, where a fast response is required to protect the semiconductor. These easy-to-install converters are particularly suitable for cost-critical applications.
Properties:
- Winding ratio from 1:50 to 1:1000
- Nominal primary current from 5 to 100 A
- Operating frequency up to 100 kHz
- Housing in self-extinguishing material UL94-HB; encapsulated under vacuum. UL94-V0 on request.
- Operating temperature range typ. -25...85°C
- In accordance with safety standard IEC 742 for operating voltages up to 600 Vrms
Important parameters:
- n Winding ratio secondary to primary = number of secondary windings (primary = 1)
- RS Resistance of the secondary windings
- Ip Permissible primary current (rms)
- LS Secondary inductance
- fn Optimum operating frequency (range if applicable)
- Vt minimum secondary transfer area at 25°C
- Uis maximum working voltage primary/secondary
- Up isolation voltage primary/secondary
- D central hole diameter/primary turn diameter
With the manufacturer Sirio we offer a wide range of inductors. The inductive components are characterized by safe galvanic isolation combined with consistently high quality.
