Current- and Voltage Sensors

AST's current sensors are based on indirect current measurement and use a 3D Hall ASIC specially developed for this task. The magnetic field caused by the current in a conductor is evaluated with high precision. This measurement method shows its strengths particularly at high currents (> 500A), as unlike shunt-based systems there is no additional power loss at the measuring element. The geometry of the current-carrying conductor can be adapted within wide limits to the installation space and measuring range requirements of the respective application. Thanks to the magnetic operating principle, current measurement is carried out with complete galvanic isolation. Voltage measurement is also galvanically isolated. The isolation is realized via an isolated digital interface, which allows high sampling rates in order to reliably record even dynamic signals. The current/voltage sensors are used in many different areas of DC measurement, for example as a calibration-compliant version in the corresponding DC fast charging infrastructure and megawatt charging systems (MCS), in the control of smart grids, for energy measurement in supply buoys for cargo ships, the monitoring of wind and solar parks as well as in the drivetrain of vehicle drives.

DC METERS (compliant with calibration law)

Sensors for energy measurement

The continuous measurement of high currents and voltages is a challenging task. Based on the 3D Hall ASIC developed in-house (AST patent), the AST DC meters enable continuous measurement up to 1,500A and 1,000V. This high measuring range makes the AST sensors particularly suitable for use in fast and ultra-fast charging stations as well as in megawatt charging systems for buses and trucks.

The DC meter is available in two design variants - as a compact measuring unit with an integrated display or as a version with a remote display and greater flexibility in complex installation situations.

Further information

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High Current/High Voltage Sensors

Sensors for measuring current and voltage in electric powertrains

Measuring currents in the range of thousands of amperes is a challenging task. The 3D Hall ASIC developed by AST enables the measurement of completely galvanically isolated currents without introducing additional resistance (shunts) to the path of the electric current. Even at currents above 1,000 A, the power dissipation is very low, and the temperature rise is well below that of shunt-based systems. AST's 3D Hall technology eliminates the need for ferromagnetic flux conducting elements and thus avoids the disruptive effects of hysteresis. The voltage measurement is based on an isolated high-speed digital interface and allows fast sampling rates for recording highly dynamic signals.

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Battery Sensor

Sensors for measuring the current, voltage, temperature, and condition of vehicle batteries

The rise of vehicle electrification is putting onboard batteries in an increasingly important role. Our high-precision battery sensors contactless determine the current, voltage, temperature, and condition of starter batteries. This allows them to provide information on the aging effects and accurately predict the remaining service life and performance.

In turn, failures due to discharged batteries and, especially in the commercial segment, cost-intensive downtimes are avoided.

Our contactless measurement method naturally has many other advantages: it is always available and also works smoothly in combination with start-stop functions and other emission-reducing measures.