1. Replace the Schottky diode on the secondary output of the switching power supply with a small power fast diode instead of using an RC snubber circuit. This change can typically improve efficiency by 1 to 2 percentage points.
2. If space and volume allow, consider using PQ or RM type transformers. If safety regulations permit, removing the retaining wall from the transformer can also help increase efficiency.
3. Pay attention to the capacitance value of the input and output electrolytic capacitors. A low capacitance in the AC input rectification stage can reduce efficiency by 0.2 to 1 percentage point. But what exactly is considered "low"?
Use an oscilloscope to check the ripple after AC rectification. For power levels below 10W, a ripple voltage of 10 to 30V is acceptable, while for higher power (over 10W), a ripple of 5 to 20V is better.
4. Keep the main current loop on the PCB as short as possible to minimize resistance and losses.
5. Optimize the design parameters of the transformer to reduce eddy current losses caused by ringing during switching.
6. Choose appropriate switching devices that offer lower conduction and switching losses.
7. Optimize the design of the input EMI filter to reduce unnecessary losses and improve overall performance.
8. Select a highly efficient topology such as LLC resonant or forward converter, depending on the application requirements.
9. Use high-quality electrolytic capacitors with low ESR and long life to maintain stable performance and efficiency.
10. Carefully design the startup circuit to ensure smooth power-up and reduce energy loss during initial operation.
11. Utilize chip-assisted power supplies where possible to enhance control and optimize efficiency through advanced regulation techniques.
Outdoor Emergency Portable Power Station
Langrui Energy (Shenzhen) Co.,Ltd , https://www.langruibattery.com