Why internal DC / DC design determines reliability
ELECTRICAL & ELECTRONICS LOW VOLTAGE, HIGH IMPACT
IDEAL POWER
Why internal DC / DC design determines reliability
As EV charging infrastructure grows, reliability has become just as important as charging speed. High-power stages naturally attract attention during development, yet many field failures begin elsewhere. In practice, the low-voltage architecture inside the charger often determines whether the system performs consistently over years of operation.
At Ideal Power, we work with engineers and product teams to help simplify the process of specifying, sourcing and supplying reliable power solutions. We regularly see projects where the highpower section has been carefully engineered, but the auxiliary power stage receives less attention. That approach can create problems later in the development cycle and in the field.
The Hidden Role of the Internal Power Supply
Every EV charger contains an internal power supply responsible for supporting communication, protection and control functions. Low-voltage rails, typically 5V, 12V or 24V, power microcontrollers, HMIs, relays, cooling systems and communication modules.
These circuits do not deliver charging current, but they are responsible for maintaining stable operation. If voltage regulation drifts or electrical noise reaches sensitive electronics, communication failures, nuisance trips and unexpected resets can follow.
For this reason, the DC / DC stage is
At Ideal Power, we work with engineers and product teams to help simplify the process of specifying, sourcing and supplying reliable power solutions.
much more than a simple voltage converter. It acts as the stability anchor for the entire charger.
Common Reliability Problems EV chargers operate in demanding environments. Long duty cycles, elevated temperatures and switching noise place continual stress on internal electronics.
Without adequate derating and filtering, component ageing accelerates and ripple levels increase. Poor isolation can allow noise from the AC / DC stage to reach control circuitry. The results are often familiar:
• Failed EMC testing.
• Unstable CAN or Ethernet communication.
• Unexpected resets.
• Nuisance protection trips.
• Increased service calls and redesign costs. These issues frequently originate in the low-voltage architecture rather than the high-power stage.
Design It In Early Mechanical layout and charging power often dominate early discussions. The internal power architecture is sometimes addressed later, creating unnecessary risk.
At Ideal Power, we recommend considering the DC / DC stage during concept development. Input range, isolation requirements, output tolerances, thermal conditions and EMC performance should all form part of the initial design process. Early selection helps reduce PCB rework, simplifies filtering and preserves thermal margins before compliance testing begins.
Wide bandgap technologies such as GaN and SiC continue to improve efficiency in high-power stages, but dependable EV charging still relies on stable low-voltage rails.
High-power conversion delivers the energy. Reliable charging starts with a properly specified internal power architecture. If you are developing EV charging equipment, our technical team can help you specify and source the right AC / DC and DC / DC solutions from the start.
For further information, please visit www. idealpower. co. uk
42 PECM Issue 81