STEVAL-ISF003V1 STMicroelectronics

STEVAL-ISF003V1 Low standby losses power front-end with inrush current-limitation Data brief Description The STEVAL-ISF003V1 evaluation board allows the inrush-current which charges a DC bus capacitor to be limited to comply with the IEC 61000-3-3 standard. This inrush-current limitation is based on a soft-start procedure of the mixed bridge diodes and SCRs rectifier using progressive phase control at board start-up. This solution can also drastically reduce standby losses as the DC bus can be totally disconnected from the AC mains when it does not have to operate. DC bus deactivation is simply achieved Features by turning off SCRs, without requiring an Fully electronic solution without the need for additional relay to open the circuit in standby. an inrush current limiter resistor and its bulky The steady-state losses are also reduced, thanks bypass electromechanical relay to the removal of the NTC / PTC resistor DC bus disconnection at standby to reduce traditionally used to limit inrush-current. losses below 0.3 W Therefore, no relay is required to bypass this Inrush current compliance with IEC61000-3- resistor as it is no longer used. 3 Operation allowed with PFC (continuous or discontinuous) Compliant with EN 55015, IEC 61000-4-11 Criteria A at 4 kV IEC 61000-4-5 and at 4 kV IEC 61000-4-4 RoHS compliant April 2017 DocID029452 Rev 2 1/6 www.st.com For further information contact your local STMicroelectronics sales office Schematic diagrams STEVAL-ISF003V1 Schematic diagrams Figure 1: STEVAL-IFS003V1 power and insulated control schematic 2/6 DocID029452 Rev 2