Custom development
Where the catalogue is not enough.
We build the equipment to your specification. Or we put our engineers on your project instead. In-house R&D since 1990.
Two ways to bring us in
What differs is who carries responsibility for the result. The people, the laboratory and the production floor are the same either way.
Turnkey custom development
You give us the requirement and the operating conditions, we deliver finished equipment. Analysis, prototype, type tests, series, service. The result is our responsibility.
How a solution is builtDevelopment capacity rental
We rent you capacity from our own development team. Our people work on your product, under your name, and the results are yours.
Three forms of engagementWho builds it
VONSCH has been developing and manufacturing power electronics since 1990. Development, production and service are under one roof in Brezno - the same people design, commission and repair the equipment.
- In-house development of hardware, firmware and control algorithms - eight experts
- In-house production, commissioning and type testing
- Measurement laboratory under the same roof - power quality analysers, oscilloscopes, spectrum analyser, thermal cameras
- Service and technical support feeding directly back into R&D
- Seven areas: traction drives · reactive power compensation · AC drives · photovoltaics · battery inverters · small hydro power plants · custom voltage sources
The range we work in
How a solution is built
Four phases. The first one decides whether the last one will make any sense.
Requirements and analysis
Operating conditions, duty cycle, standards. We separate what is a real requirement from what is just habit carried over from the previous equipment.
System architecture
Topology, sizing, semiconductor selection. Control behaviour is verified by simulation in MATLAB / Simulink before the first prototype is soldered.
Prototype and validation
Prototype, laboratory measurement. Type tests, EMC, documentation, commissioning.
Serial production and service
Production, commissioning, operator training. Long-term care - we commonly support equipment for more than two decades.
Development capacity rental
Experts who build drives.
Hardware, software and electrical design are covered by eight experts. Not all of them are free. Which profiles we can assign, and from when, we agree against your requirement.
Dedicated specialist
Full capacity of one profile. Managed by your project manager, part of your team.
Partial capacity
An agreed monthly scope, for example 40 to 80 hours. For consultations or for a single topic.
Team with its own lead
An assembled team for hardware, software and electrical design. You set the assignment, our lead is accountable for the output.
What we know
The tools, buses and standards we have proven on our own products.
Hardware, mechanics and electrical design
Converter topologies from 0.37 kW to 1400 kW, 3 x 400 / 500 / 690 V AC, traction 80 to 1000 V DC. Three-level ANPC, active front end (AFE), bidirectional DC/DC with SiC. Schematics and PCBs in Siemens EDA PADS, DC-link sizing, thermal design, EMC. SolidWorks and 3D assemblies, enclosures IP20 to IP55, electrical design and documentation for inspection.
Firmware for drives
C and C++, Texas Instruments Code Composer Studio, TMS320F28388D processor, FPGA logic in Intel Quartus Prime. Vector control of torque, speed and position, field weakening, output up to 3000 Hz. STO functional safety to EN 13849-1 PL c. MATLAB and Simulink.
Communication and integration
Modbus RTU and TCP, CAN, PROFIBUS (our own RM-PB DP module), EtherCAT master and slave. CODESYS, Beckhoff TwinCAT, Revolution Pi, Siemens TIA Portal. Integration with third-party PLCs.
Application and system software
C# and .NET, Visual Studio, ASP.NET Core, SignalR, Avalonia, Git. Full stack web: PHP, MariaDB, JavaScript. Linux, Python, C and C++. Parametrisation and diagnostic tools (VONSCH Drive Studio), cloud interface, mobile diagnostics for Android. AI coding.
Cybersecurity
CRA (EU Regulation 2024/2847): classification, risk matrix, signed firmware (ECDSA), PKI, access roles, audit log, TLS, mbedTLS. PSIRT established.
Measurement and testing
Power quality analysers QUALISTAR CA 8335 / 8336 / 8345, HIOKI PQ3198, oscilloscopes, spectrum analyser, thermal cameras. Measurements under load, mains quality, thermal measurements.
Artificial intelligence
Opening the drive up to artificial intelligence through the open MCP standard (Model Context Protocol): diagnostics in plain language over the device's real parameters, with a human in the loop.
What we typically build
| Area | Voltage | Power / current |
|---|---|---|
| Traction drives | 80 - 1 000 V | 1.5 - 500 kW |
| Artificial AC mains 50 / 60 / 400 Hz | 50 - 690 V | 1.5 - 500 kVA |
| Backup supplies and UPS | 400 V | 33 - 100 kW |
| Thyristor switches ACSW | 3 x 400 V | 72 - 100 A |
| Traction battery chargers | max. 500 V DC | max. 20 A / module |
| Industrial drives and AFE | 3 x 400 / 500 / 690 V | 0.37 - 1 400 kW |
Ranges are based on delivered projects. Outside this range we solve it case by case.
Real projects, real numbers
A cross-section of what we have built to order over the years. Most of it exists because a catalogue solution did not work in that particular application.
Traction drives
Traction drives - Inverters for mining trolley and battery locomotives
- Versions for explosive atmospheres, Ex ib and Ex d
- Communication and control systems, USB black box, crash logger
- Camera safety system, tandem operation
- Since 2026 hybrid drives with on-board battery and recuperation
Traction battery chargers
Traction battery chargers - Modular concept, units in parallel for the required power
- Supply 3 x 400 V / 50 - 60 Hz, output max. 500 V / 20 A
- Switching frequency 150 kHz, SiC power semiconductors
- Fully digital control, any charging characteristic
- Modbus RTU or graphical panel, battery connection check
Artificial AC mains
Artificial AC mains - Test mains for products intended for export - 50, 60 or 400 Hz
- Voltage per the target country standard or per specification
- Single-phase and three-phase, from a few kVA up to 500 kVA
- Replacement for rotary converters - no maintenance, precise control
- Delivered with transformer, enclosures, certification and training
ACSW - thyristor switches
ACSW - thyristor switches - Replacement for classic contactors, 3 x 400 V, 72 - 100 A
- Dynamic power factor correction
- Smooth switching of capacitive load without current peaks
- Zero-voltage switching, short switch-on time
- Service life is not limited by the number of switching cycles
- Typical applications: lifts, cranes, welding machines
UPS and backup power supplies
- Emergency movement of a lift to the nearest floor
- AC source for the door drive, control system, brake and control circuits
- DC source for the hoist drive inverter
- Completion of the work cycle during a mains outage
- Thermal, overcurrent and overvoltage protection, custom software functions
Renewables and energy storage
Renewables and energy storage - Photovoltaics - inverters, control, monitoring
- Battery storage on the NEXICONTROL platform
- Three-level ANPC topology, SiC and IGBT combination
- Droop control, precise voltage regulation, bidirectional energy flow
- Small hydro power plants - drives, compensation, visualisation
Why give it to us
We enjoy the technical problems others back away from.
You buy the domain, not the hours
Our people build drives, not software in general. You do not have to teach them what field weakening is, or why the current waveform changes with the modulation. Ramp-up takes days, not months.
One person, a whole team behind them
When your assigned expert hits a wall, they ask the colleague who has already solved it once. You pay for one capacity and get the experience of the whole department, the laboratory and the production floor.
Our own firmware
Whatever the application needs can be programmed straight into the drive. We are not tied to anyone else's control software.
Solutions that run in the field
Our control runs in mining locomotives in Australia and holds island power plants together in Africa. Out there, you do not restart the equipment.
Short chain of command
Decisions take hours, not weeks. The engineer who designed the equipment is still available five years later.
Nearshore in the EU
The same time zone and working calendar, Slovak and English, a face-to-face meeting within a day. The results of the work on your project pass to you.
Lifetime measured in decades
We build products to last decades, not a warranty cycle. Long-term spare-parts availability and managed obsolescence.
We name our mistakes
When something goes wrong, we name it and fix it. Service and technical support run directly through the development team.