Premo develops Industry Smallest 35 Amp current sensor for automotive.

10th January 2013
Source: Premo
Posted By : ES Admin

Inverters and DC/DC battery chargers for Electric and Hybrid Vehicles require minimum space and maximum power handling per cubic cm. A proper switching management require digital controls more than conventional PWM and a real time high frequency (The sensor is designed for 200kHz ) sampling of the currents flowing through the primary is a must for high speed anticipative control systems.

The new CS-35A current sensor is designed with low losses and high temperature stability E-type ferrite core which allows working frequencies higher than 200 kHz at operating temperatures from -40ºC up to 155ºC.

The converters for hybrid and electric vehicles works at high voltage (400V) in the input site, which makes a must to isolate primary winding of the current sensor, directly connected to the high voltage circuit, from the secondary site, connected to the control circuit. Premo current sensor guarantees more than 3kV isolation.

A precise (Premo sensor precision 2%) sensing of primary currents let the system manage line and specially load regulation being able to set the workload and optimum working point either to maximize power or to minimize power consumption or dissipation ( Sensor dissipation less than 1W). Above all, a low DCR current sensor (Premo’s typical DCR is 1mOHM), is an efficient tool for ZVT and ZVS full bridge topologies to minimize stress in High frequency switching MOFET’s.

Main characteristics:
Nominal primary current 35 Arms
Turns ratio 1:100
Secondary Inductance > 5mH
Primary DC resistance = 1mOhm typ
Secondary DC resistance = 1.6Ohm typ
Primary to Secondary Isolation > 3kVdc
Operating temperature: -40ºC to 155ºC

Among those characteristics PREMO current sensor is fully AECQ-200C complaint and ready to use in AOI (Automatic Soldering Inspection) system, as required in automotive market.

The fast Industry evolution that is changing the Auto sector is making design time and time to market as fast as in Consumer and ready- to- use off the shelf solutions fully qualified helps Power Electronics Design Engineers increase their throughput by standardization.

This format will be also available in others turns ratio, but for now the 1:100 turns ratio is that will be available by Q1-2013:
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