Feature: System design
Figure 3: Pulsiv Osmium benefi ts
Pulsiv’s approach has extended the range of efficient flyback designs by significantly reducing losses and improving overall energy consumption. When a flyback design is paired with Pulsiv Osmium technology, it can replace conventional LLC designs to deliver a flat efficiency profile and reduce size, weight and cost. Figure 1 shows the difference between a conventional boost PFC + LLC power supply and a Pulsiv Osmium + flyback design – both deliver 100W at 48V whilst supporting universal input: 61.5% efficiency gain at 2W and 43.5% efficiency gain at 7W; see Figure 2. The flyback design with Pulsiv Osmium technology
delivers significant efficiency gains at low loads and maintains consistent performance as the power increases. If we apply these efficiency curves to the updated eco-design regulations, the total available power and wasted power are dramatically different; see Figure 3. In this example, Pulsiv Osmium delivers: • Almost 4x more total available power at 2W and reduces energy waste by 88%. • Almost 2x more total available power at 7W and reduces energy waste by 83%. While methods are available to improve traditional designs,
these will involve using multiple power supplies to manage the conversion process at different loads or adding design complexity, cost, size and weight. Introducing GaN and SiC technologies increase peak
efficiency, but it has a limited effect at low loads where the new regulations apply.
Pulsiv Osmium technology Pulsiv Osmium uses patented switching techniques to improve efficiency during standby modes and maintain performance across the full load range. Energy waste is significantly reduced by charging a parallel capacitor rather than using a lossy boost PFC inductor. The Pulsiv Osmium microcontroller manages the entire
AC to DC conversion process (Figure 4) and ensures that just enough energy is available to ride through a time when the grid cannot support the load. The capacitor is then discharged by a DC-to-DC converter through a simple diode. The voltage on the storage capacitor is regulated at 150V or 180V (pin-selectable), which means avoiding larger and more expensive 400V capacitors.
Thinking differently about power supplies With tightening limits on standby power effecting billions of devices, many companies will be forced to think differently about their power supplies. If they want to use every available watt for important features/functions, conversion efficiency becomes a critical consideration. Pulsiv Osmium technology offers a truly unique performance profile that will enable customers to achieve more within a fixed power budget.
www.electronicsworld.co.uk November 2023 33
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