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Obligatory since 2001 for Appliances with a Current Consumption less than 16A: Reduced Harmonics of the Input Current
EN 61000-3-2 (predecessor standard EN60555-3) requieres the compliance to strict limit values for the harmonics of the line side current; the standard is obligatory since 1,1,2001 y also on professionally used devices, if they are operated at the public low-voltage system. In particular critically: Devices with diode rectifier, e.g. with link converters and power supplies (also with 50/60-Hz-transformers and linear regulator!).
Note: Limit values for professional devices with an input power of more than 1 kW still are in consultation; after the modifikation EN61000-3-2/A14 a permission to connect must be caught up by the utility for professionally used devices, which do not fulfill the requirements of the standard.
Our preferential solution: PFC/power factor correction circuit with boost stage
- Excellent efficiency (up to 99% at 230V, 92% at 110V)
- Alternatively for wide input voltage range 90-265V (we recommend however the use of variants for different line voltages )
- Reduced filter expenditure by modulated switching frequency
- Compactly; volumes and weight can be reduced father by using inoovative SiC diodes
- Integration of our circuit on your PCB possible
- Inexpensive
- More efficiently and more economically than external preconnected devices
Advantages of the power factor correction circuit independently of standard fulfilment
Power supplies
- Smaller expenditure and improved efficiency for DC/DC converters downstream due to constant regulated link voltage
- Improved utilization of the link capacitors for power failure buffering
- Reduced (RMS-) current consumption; lower cost for electrical installations
Variable speed drives
- Substantially improved utilization of the machines due to constant DC-link voltage (up to 30% higher maximum power; see diagram!)
- Optionally energy recovering during braking
- Reduced (RMS-) current consumption; lower cost for electrical installations
- No high (harmonic -) currents in the neutral line with several single-phase inverters, which are distributed connected to the three-phase mains.
Alternative for devices scarcely over 75W: We support you to reduce the energy consumption of your equipment
To this topic the managing director has presentated on 5/10/2001 at TU Darmstadt (pdf file, 3.2 MByte, German)
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