Inverters and DC/DC battery chargers for electric and hybrid vehicles require minimum space and maximum power handling per cubic cm. The new CS-100-AU automotive current sensor from Spanish manufacturer Grupo Premo uses just 2.4mm3 and handles 14.6A/cm3.
A proper switching management require digital controls more than conventional PWM and a real time high frequency sampling of the currents flowing through the primary is a must for high speed anticipative control systems. The sensor is designed for 200kHz sampling frequency.
The CS-100-AU is designed with low losses and high temperature stability toroidal 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 3kV isolation and a creepage distance > 6.5mm.
A precise (Premo sensor precision 2 percent) 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 0.5mOhm), is an efficient tool for ZVT and ZVS full bridge topologies to minimize stress in High frequency switching MOFETs.
- Nominal primary current 35 A
- Turns ratio 1:100
- Secondary Inductance > 4mH
- Primary DC resistance = 0.5 mOhm typ
- Secondary DC resistance = 0.8 Ohm typ
- Primary to Secondary capacitance < 7pF
- Primary to Secondary Isolation > 3kVdc
- Operating temperature: -40ºC to 155ºC
Among those characteristics PREMO current sensor is fully AECQ-200C compliant and ready to use in AOI (Automatic Soldering Inspection) system, as required in automotive market.
Courtesy of Automotive DesignLine Europe.