AST’s current sensors are based on indirect current measurement using a 3D Hall ASIC specially developed by AST for this task. This involves measuring the magnetic field created by the current in a conductor with extreme precision. This measuring method reveals its strengths particularly at high currents (>500A), since, in contrast to shunt-based systems, no additional power loss occurs at the sensing element. The shape of the current-carrying conductor can be adapted within wide limits to the respective application’s installation space and measuring range requirements. Current is measured under complete galvanic isolation made possible by the principle of magnetism. Voltage measurements are also galvanically isolated. In this case, isolation is achieved via an isolated digital interface that supports high sampling rates so that even dynamic signals can be captured reliably. Current/voltage sensors are primarily used in the powertrain of battery-electric and fuel cell-based vehicle drive systems as well as the corresponding offboard charging infrastructure. These sensors are also available in a calibratable version. The application-specific sensors’ current measurement range extends up to 2500A and therefore supports future generations of fast-charging stations.
High Current/ High Voltage Sensor
Insulated High Current/ High Voltage Sensor for HV Electrical Powertrain Systems
Measuring currents in the range of thousands of amperes is a challenging task. The AST owned 3D-Hall ASIC permits a fully insulated current measurement without introducing additional resistance (shunt) to the current path. Even at currents above 1000A the power dissipation is very low and the rise of temperature is much lower than in shunt based systems. The AST 3D-Hall technology enables a contactless current measurement without using flux guiding elements made out of ferromagnetic materials which cause hysteresis problems. The Voltage Measurement is based on an insulated high speed digital interface, allowing fast sampling rates for the measurement of high dynamic signals.
Increasing electrification of vehicles has led to increasing demands being placed on vehicle batteries. Our high-precision contactless battery sensors determine the current, voltage, temperature, and status of starter batteries, providing information on aging effects and precise predictions of the remaining service life and performance capacity.
This helps prevent breakdowns due to drained batteries, with drivers knowing exactly when a battery needs to be replaced.
Our contactless measurement procedure offers a range of benefits: Not only is it permanently available, it can be flawlessly combined with start-stop functions and additional emissions-reducing measures.