Electrical Engineering

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The invention pertains to an integrate-and-hold circuit which is used as a sampler. The typical structure of an integrate-and-hold circuit (IHC) is a multiplier serving as a switch followed by a resettable integrator with a hold capacitor.

Cleaning robot swarm

Particularly in the commercial sector (e.g. hotels, offices, retirement homes, hospitals) but also in private use, it is desirable if a floor cleaning by robots in the shortest possible time is completed (noise, accessibility).


Headphone-based binaural 3D audio gives us a realistic sound experience that can be enhanced even further by considering the head movements of the listener.


For a fast and precise control of mechatronic systems usually non-linear PID controllers are used. The more nonlinearities a system contains, the more complex the control task becomes.


To reduce the input resistance of power modules, single semiconductor switches are usually connected in parallel.

Brake resistor

To decelerate an electric motor, the remaining kinetic and magnetic energy must be removed from the system. This is usually done with brake resistors that convert the energy to heat.


Sample-and-hold circuits or track-and-hold (TH) circuits, along with analog-to-digital converters (ADCs), are the link from the analog to the digital world.


A method for the movement guidance of mobile robots by means of an intuitive trajectory control was recently developed at Bochum University for Applied Sciences.

Substitute for LIDAR sensors

Optical components like photodiodes have a variety of uses in sensors and telecommunications technology. Even with time-of-flight sensors, the light reflected by objects has to be converted into electrical signals in order to compute the distance or speed of said objects.

Hardware-based security module

The hardware-based security module enables authentication of common information processing devices without having to modify them. It can be used for Bluetooth, Wifi, NFC, Zigbee applications or proprietary data transmission systems, as well as for mobile devices such as smartphones and tablets. It is more tamper-proof than previous encryption solutions.

Compensating for Leakage current

Efficient charging of traction batteries is a key technology for the success of electric vehicles on the market. To this end, concepts for transformerless on-board chargers are currently being increasingly considered. Interfering high leakage currents to ground can be prevented or compensated for by this invention.

Optimized Amplifier Circuit

Shunt current measurement techniques are used in electric cars and in the charging stations. Special control of the circuit allows amplifiers to be ramped up to the operating point very quickly, safely and reliably. The amplification factor can be adjusted over three orders of magnitude.

Digital Power Factor Correction

By using this new digital power factor correction, the electromagnetic interference in power electronic systems such as battery chargers, plug-in power supplies, computer power supplies or e-bike chargers can be significantly reduced.

Microwave thermograph

The new method for microwave thermography uses a commercially available HD optical camera and an indicator plate to convert the microwaves into a high-resolution, digital field distribution. The developed indicator plate allows microwave thermography between 1 GHz and 300 GHz.

Measure the smallest of currents of CMOS chips

Lab-on a chip applications often need to be able to measure the smallest currents on CMOS chips. Thanks to a new measurement circuit, an offset and 1/f noise compensated current-to-digital conversion can be integrated directly on the chip and thus a current measurement can be realized cost-efficiently over a very large measurement range (fA - µA).

CMOS biosensors

Production process for a highly sensitive biosensor made from a crossed nanowire-structure field-effect transistor. The cost effective CMOS compatible production process allows for e.g. biosignal monitoring of molecules like c-reactive protein (CRP), cardiac troponin (cTnI), electrogenic cells, or peptides such as amyloid-beta.

Modular charging station

This modular charging station for small, battery-operated devices like electric toothbrushes enables low-wear charging of batteries and reduces messy cabling.

Smart charging for electric vehicles

There is a growing trend for electric vehicles. Their drive batteries require charging at high power from the available AC power grid. Three-phase on-board chargers (OBCs) are used for this purpose at high power outputs of at least 11 KW.

Lock-In Amplifier

Lock-In amplifiers are firmly anchored in everyday research. They offer excellent noise suppression for repeating signals. The degree of suppression, however, depends critically on the low-pass filter at the end of the signal processing chain.

Synthetic Image Data

Almost all car manufacturers are currently developing camera-based autonomous or semi-autonomous vehicles.

Optically switched resonant-tunneling diode

Resonant-tunneling diodes are semiconductor components that, due to the quantum mechanical effect of the tunnel, have a current-voltage characteristic with a negative differential resistance.

DC-DC resonant converter

Flexible chargers for batteries (especially in the field of e-mobility), fuel cell applications or flexible photovoltaic battery combinations all contain switch-mode power supplies with DC converters, DC-DC converters in short.

Method for current measurement in half-bridge topologies

A number of different instrument transformers are used to determine voltage and current in regulated power electronics. Current measurement becomes more and more difficult with increasing current intensity, especially since the switching frequencies increase due to the use of modern (e.g. GaN) transistors and parasitic properties of the sensors must be minimized.


The electrical power grid is undergoing a major transformation. Increasing numbers of decentralized feeders have been added in recent years and, in the future, there will be a large number of charging stations for electric vehicles that temporarily draw a large amount of electrical power from the power grid.

Future Display Technology

The presented technology is a two dimensional optical waveguide with very low attenuation.