A 250 kW four quadrant switch mode converter for the 1.4 GeV PS-booster beam transfer lines at CERN

This paper describes a four quadrant, 250 kW (550 V, 450 A) switch-mode, zero current soft switching (ZCS) power converter for a 1.4 GeV beam transfer line magnet. The ZCS technique is the preferred approach for the high power switch-mode converters employing insulated gate bipolar transistors (IGBT) to reduce switching losses and EMI. This switch-mode power converter topology has been selected because of the high dynamic response, low output ripple, and low input current harmonics. In this paper, the circuit topology, function of the system components, key system specifications and experimental results for a 250 kW switch-mode converter are described in detail. The experimental results include output current transient response and conducted electromagnetic interference (EMI, measurements at both AC input and DC output). The design and development process employed is based on virtual electrical simulation of the system. This technique has been essential for the successful development of this unit