LUKE ROBERTS

Power Supply for Smart Light

The startup, founded in Vienna in 2014, specializes in the development of smart home lighting. The company distributes its lights worldwide, with a focus on the European and North American markets. The patented technology of the lights and their ability to adapt to user habits make them unique.

About

Luke Roberts

Industry: Smart Home Applications

Company size: 10-50 employees

Country: Austria

Products:

  Lighting
  Smart Homes 

“Netzteile sind unverzichtbar für den Betrieb elektronischer Geräte, da sie eine stabile Stromversorgung liefern, welche den Anforderungen des jeweiligen Geräts entspricht. Ohne Netzteile könnten elektronische Geräte nicht betrieben werden, da sie auf eine stabile und präzise Stromversorgung angewiesen sind.”

Vorname Nachname

Position

“Netzteile sind unverzichtbar für den Betrieb elektronischer Geräte, da sie eine stabile Stromversorgung liefern, welche den Anforderungen des jeweiligen Geräts entspricht. Ohne Netzteile könnten elektronische Geräte nicht betrieben werden, da sie auf eine stabile und präzise Stromversorgung angewiesen sind.”

Vorname Nachname

Position

Requirements

Case study

The customer’s requirement was to integrate the power supply into the existing mechanics of the lights without affecting the design. The shape of the printed circuit board and the build height were predetermined by the customer. Due to the closed housing, there was no ventilation, which would normally allow for convection cooling. As a result, losses in the device had to be minimized to avoid exceeding the specified temperatures. This resulted in the efficiency target being significantly exceeded. 

Due to the high requirements for harmonic currents, the electrical concept chosen was a “Flyback PFC.” This means that the input capacitance is greatly reduced, which in turn affects the output voltage ripple. This concept choice allowed for extremely cost-effective development of the power supply. 

The expectation for the power supply was that it would be particularly low-noise, especially when in idle mode. By using a potted transformer and a specially adapted “skip cycle mode” during idle operation, the low-noise functionality of the power supply was ensured. The modification also improved idle power, which is crucial for continuously running devices like lighting. 

The reduced intermediate circuit capacitance increases the risk of the device being damaged by a lightning strike and the resulting sudden overvoltage of several kilovolts. To mitigate this risk, we developed a specially designed protection circuit consisting of a combination of suppressor diodes and varistors, which safely dissipates the voltage surges. The circuit was successfully tested on our in-house surge generator. 

Due to the specific norm requirements in the lighting application, the standards of EN 61347-2-13 safety certification were applied in combination with the luminaire. Harmonic currents were certified according to EN 61000-3-2 Class C.