Inductors for EV charging systems, solar inverters & UPS systems from Ajka
Ajka Transformatoren Kft. develops inductive components specifically for the requirements of modern power electronics. Our coils, transformers, and chokes are used in systems that require high efficiency, compact design, and reliable long-term stability.
EV Charging Systems
Wallboxes and DC fast chargers require high power density and compact design. Our flat wire chokes and coils meet these requirements with minimized core losses and reproducible inductance values.
Solar Inverters
Grid-tied and off-grid solar inverters require precise filter inductors. Our integrated multi-phase inductors improve inductance balance and reduce circuit complexity.
Synchron-Generatoren 10-100 kVA
Output chokes and EMC filter inductors for frequency converters and industrial drive systems – designed for continuous operation with thermal stability.
UPS Systems
Highly reliable chokes and transformers for uninterruptible power supplies – developed to meet the requirements for availability and long-term stability in UPS systems.
Integrated Multi-Phase Inductor: Product Example in Comparison
In typical three-phase systems such as solar inverters or EV charging controllers, three separate inductors are used, often leading to imbalance (±14%) and complex control due to magnetic coupling.
Ajka Transformatoren Kft. offers an integrated solution with a shared magnetic core for all three phases.
Key results:
–37% weight, –45% volume, improved balance (±0.1% vs. ±14%), lower coupling (0.15 vs. 0.45), and reduced losses.
The lower coupling ensures stable operation even under DC bias. The design works as a direct drop-in replacement without circuit changes.
Inductive components are essential in power electronics as energy storage, filters, or voltage sources, directly affecting
efficiency, emissions, and controllability.
A key challenge is switching: when inductive loads are turned off, voltage spikes occur due to stored magnetic energy.
Our chokes and transformers are designed with these conditions in mind.
In multi-phase systems, coupling behavior strongly impacts performance. Our integrated design reduces the coupling coefficient to 0.15 (vs. 0.45),
ensuring stable and predictable inductance values even under DC bias conditions.
Inductors store energy in a magnetic field and oppose changes in current flow. When a voltage is applied, the current does not instantly reach its final value but follows an exponential curve according to the time constant τ = L/R. This behavior is intentionally utilized in filter applications and energy storage circuits and is essential for the design of chokes in switch-mode power supplies and inverters.
When inductive loads are switched off, a voltage spike is generated due to the stored magnetic energy (back EMF). Without appropriate protection circuitry, this can damage semiconductor switches. In the design of our components, we take the switching conditions and switching frequencies of the respective application into account. Please contact us with your system parameters.
In a series connection without magnetic coupling, the inductance values add up. In magnetically coupled inductors – such as in integrated multi-phase topologies – the coupling coefficient plays a key role. It influences the effective inductance of each phase and the interaction between phase currents. Our integrated multi-phase design minimizes this coefficient to 0.15, making system behavior significantly more predictable.
In traditional setups, manufacturing tolerances lead to imbalances of typically ±14% between phases. Our integrated approach with a shared magnetic core achieves ±0.1% – even under DC bias conditions. This significantly simplifies power control and reduces the complexity of control algorithms.
Yes. The integrated design is intended as a direct drop-in replacement for existing multi-inductor configurations in three-phase and single-phase systems. No modifications to the circuit layout are required.
You can download technical datasheets and product information directly. For specific design questions or custom manufacturing requests, please contact our sales team directly.
Interested in working with us?
Contact us with your technical requirements – we look forward to inquiries from the European power electronics industry.
