sigma

Low standby loss power front end with inrush current limiting

STEVAL-ISF003V1

Overview

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 by turning off SCRs, without requiring an additional relay to open the circuit in standby.
The steady-state losses are also reduced, thanks to the removal of the NTC / PTC resistor traditionally used to limit inrush-current. Therefore, no relay is required to bypass this resistor as it is no longer used.

Main features

Fully electronic solution without the need for an inrush current limiter resistor and its bulky bypass electromechanical relay
DC bus disconnection at standby to reduce losses below 0.3 W
Inrush current compliance with IEC61000-3-3
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

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-06-20 10:37:50

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