Category | Transducers

Air-core Transducer Technologies

Posted on 23 November 2012

              The performance of current and voltage transducers are often limited by the characteristics of the magnetic core material itself (e.g. remanence, hysteresis, non-linearity, losses, saturation), so the design of an air-core, or coreless, transducer is often considered. In this case the following issues have to be taken into [...]

Transducers Based on Fluxgate Technologies

Posted on 12 November 2012

              Most current transducer technologies can be modified into a voltage transducer by ensuring the small measurement current (proportional to primary voltage) is applied to a large number of primary turns to create the Ampere-turns necessary for measurement. This is commonly accomplished with Fluxgate technologies, but less typically with [...]

Eta Technology Hall Effect Current Transducers

Posted on 20 September 2012

              Eta is the name of the Greek symbol ‘η‘, representing efficiency. The Eta transducer product family has been given this name because of its very low secondary power requirements while also providing exceptional performance. In terms of performance, Eta falls between open loop and closed loop technologies. Because [...]

Basis for Hall Effect Technologies

Posted on 07 June 2012

              Many technologies are based on the phenomenon known as the Hall effect, discovered in 1879 by American physicist Edwin Herbert Hall at Johns Hopkins University in Baltimore. The Hall effect is created by Lorentz forces, which act on charges moving through electric and magnetic fields. The Lorentz force [...]

Closed Loop Hall Effect Voltage Transducers

Posted on 31 May 2012

              The article "Characteristics of Closed Loop Current Transducers" describes the measurement of current with galvanic isolation, but it is also possible to measure a primary voltage with galvanic isolation using the same technology. Such voltage transducers are based on sensitive and accurate current measurement technologies, such as closed [...]

Concerns When Using Transducer Measurement Devices

Posted on 24 May 2012

              Below are some concerns that one should be aware of when using transducer based measurement devices. Power supply polarity inversion A transducer may be damaged by an inversion of the power supply voltage or connection of supply voltages to the output or common pins. If this is a [...]

Selecting Voltage Transducers

Posted on 18 May 2012

              The selection criteria for a current transducer (see "Selecting Current Transducers") are also applicable to voltage transducers, especially when the voltage measurement is based on a "current measurement principle". The main difference lies in the primary parameters which affect the link between the voltage to be measured and [...]

Introduction to Closed Loop Hall Effect Current Transducers

Posted on 14 May 2012

              Construction and Principle of Operation of Closed Loop Hall Effect Current Transducers While open loop current transducers amplify the Hall generator voltage to provide an output voltage, closed loop transducers use the Hall generator voltage to create a compensation current in a secondary coil to create a total [...]

Selecting Current Transducers

Posted on 08 May 2012

              The article "Transducers - Basic Principles of Selection" outines general criteria for selection of tranducers. Below is a more detailed listing of important criteria to be considered when choosing a suitable current transducer for a given application. Some applications of current transducers have a high level of complexity [...]

Transducers - Basic Principles of Selection

Posted on 07 May 2012

              Use of current and voltage transducers in power electronics applications covers a broad range. Transducers are widely used in industrial applications, electric traction, energy distribution, automation markets, the automotive sector, and in battery monitoring. The selection of a transducer is the result of a technical and economic trade-off, [...]