Current Sensors Sinomags Current Sensor Portfolio

The Sinomags current sensor portfolio includes different sensor families with a variety of types with a wide range of currents to be measured for different industries and applications .

Here closed-loop and open-Loop measurement principals are available as well special sensors for leackage current detection, with very high bandwidth and sensors designed following automotive qualification standards.


Use the industry overview to find the right sensor family for your application. Do you already have a current sensor in your application? With our comparison table you can select an alternative sensor from our portfolio.Or browse to the general catalogue of current sensors.

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Sinomags Overview

Module Level Current Sensors Compact Module Level Current Sensors for PCB mounting

Open-loop current sensors measure AC and DC currents and provide electrical isolation between the  circuit being measured and the output of the sensor (the primary current is measured without electrical contact with the primary circuit, providing galvanic isolation). Less expensive than their closed-loop cousins, open-loop current sensors are generally preferred in battery-powered circuits given their low-operating power requirements and small footprint features.Closed-loop sensors measure AC and DC currents and provide electrical isolation.
They offer fast response, high linearity, and low temperature drift. The current output of the closed-loop sensor is relatively immune to electrical noise. The Closed-loop sensor is sometimes called a ‘Zero-Flux’ sensor because its sensorelement feeds back an opposing current into a secondary coil, wound on the magnetic core to zero the flux produced in the magnetic core by the primary current. Closed-loop sensors are often the sensor of choice when high accuracy is essential.

Chip Level Current Sensors High Integrateable Current Measurements with Chip Level based Sensors

Due to the compact design, these sensors can be easily integrated into existing constructions. New developments, on the other hand, can be significantly reduced in their overall size. The trend in power electronics is no different than in other areas of electronics, the smaller the parts, the more compact the overall design can be at the end.The Sinomags and Sensitec chip level sensors were developed to meet this trend towards higher integration. In contrast to the modul level products, in which the current conductor is integrated, the concept of the chip level types is different.

Working principle:
The sensor brought close to an existing conductor, which can be a cable, a current bar or a conductor track within a circuit board.The sensing element (AMR or TMR) detects the magnetic field of the conductor and converts it into an output voltage. This is the basic principle of open loop technology.

Important is the galvanic isolation of the sensor to the conductor. In the 616 product series, this is performed by the printed circuit board on which the TMR sensor is bonded.

Module Level Current Sensors (RCD) Module Level Current Sensors for Residual Current Detection (RCD)

Leakage current of the photovoltaic system, which is also known as the square matrix residual current, is essentially a kind of common mode current. The cause is that there is parasitic capacitance between the photovoltaic system and the earth. When the parasitic capacitance-photovoltaic systemgrid forms a loop, the common mode equipped with a industrial frequency transformer, because of the relatively high parasitic capacitance between the transformer windings in the loop, the common mode current generated by the common mode voltage in the loop can be suppressed to a certain extent. However, in a photovoltaic system with no transformer, the loop impedance is relatively low, and the common mode voltage will form a large common mode current, ie, leakage current, on the parasitic capacitance between the photovoltaic system and the earth.

Hazard of leakage current
If the leakage current in the photovoltaic system, including the DC part and the AC part, is connected to the grid, it can cause problems such as grid-connected current distortion and electromagnetic  interference, so as to affect the operation of the equipment in the grid. In addition, leak current can also electrify the solar inverter casing, thus threatening physical safety.

Standard and detection of leakage current
According to the 7.10.2 regulation of NB32004-2013 / IEC 62109-1:2010 standard, in any case where the solar inverter is connected to the AC grid and the AC breaker is turned off, the inverter should provide leak current detection. Leak current detection should be able to detect the total (including the DC and AC parts) effective value current, continuous residual current.

Sinomag's residual current detection sensors not only meet the requirements of the solar industry, but wherever a leakage current has to be detected in order to avoid damage to a system or even danger to people, these products are a precise and cost-effective solution.

Current Sensors for High Frequency Measurement Fast Current Sensors with High Switching Frequency or High Bandwidth

Today, the steadily increasing need of electric power is a global concern that must be faced through an improvement of the energy efficiency (reduction of power consumption) in high-power and high-frequency electronics devices. The development of new technologies for energy efficient high-power and high-frequency devices is driven by strategic interests in different fields, e.g., energy conversion systems (photovoltaic, automotive, energy distribution,…), telecommunication, transportation,  consumer electronics, etc. Until now, most of powerelectronics devices have been based on silicon (Si). However, Si electronics has almost reached its physical limits and the introduction of new materials and technologies “beyond Si” has become mandatory.In addition, another important driving force for high-frequency components is the market of the microwave and millimeter wave signal processing, for civilian, military and space applications (satellites, radars, etc.). In this context, wide band gap (WBG) semiconductors like Silicon Carbide (SiC), Gallium Nitride (GaN) and Diamond, and other materials like GaAs, graphene and related 2D-materials, etc., are considered the materials of choice for the next generation of high efficient devices operating at high power, high frequency and under harsh environment (temperature, radiation, …).

The high switching speeds of modern power electronics call for sensors able to keep up with the megahertzlevel frequencies involved.

Automotive Current Sensor Current Sensor designed in consideration of automotive qualification standards

Chip Level Current Sensor especially designed for automotive application. The compact SMD package without primary current bus bar can be integrated into power electronics.

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