TY - GEN
T1 - Zeroing transformer's DC current in resonant converters with no series capacitors
AU - Gertsman, Alexander
AU - Ben-Yaakov, Sam
PY - 2010/12/20
Y1 - 2010/12/20
N2 - DC current unbalance in the windings of a transformer may initiate a runaway process and ultimately drive the transformer into saturation. Such a situation could arise in a transformer coupled resonant converter that does not include a series capacitor. This issue was explored in this study theoretically, by simulation and experimentally. A method is proposed for automatically adjusting the transformer's DC current to zero by correcting the asymmetry of the drive. This balancing control is facilitated by a signal obtained from a DC/AC current sensor which senses the transformer's primary and secondary currents such that they cancel each other for the no DC case. The proposed method was tested on a self oscillating, parallel loaded DC-DC resonant converter of 12V input voltage 500V output voltage and 700W power level. The proposed approach allows the design of resonant converters without DC decoupling capacitors which could lead to a significant cost and size reduction.
AB - DC current unbalance in the windings of a transformer may initiate a runaway process and ultimately drive the transformer into saturation. Such a situation could arise in a transformer coupled resonant converter that does not include a series capacitor. This issue was explored in this study theoretically, by simulation and experimentally. A method is proposed for automatically adjusting the transformer's DC current to zero by correcting the asymmetry of the drive. This balancing control is facilitated by a signal obtained from a DC/AC current sensor which senses the transformer's primary and secondary currents such that they cancel each other for the no DC case. The proposed method was tested on a self oscillating, parallel loaded DC-DC resonant converter of 12V input voltage 500V output voltage and 700W power level. The proposed approach allows the design of resonant converters without DC decoupling capacitors which could lead to a significant cost and size reduction.
KW - Digital control
KW - Magnetization current
KW - Resonant power conversion
KW - Transformer saturation
UR - http://www.scopus.com/inward/record.url?scp=78650158722&partnerID=8YFLogxK
U2 - 10.1109/ECCE.2010.5618289
DO - 10.1109/ECCE.2010.5618289
M3 - Conference contribution
AN - SCOPUS:78650158722
SN - 9781424452866
T3 - 2010 IEEE Energy Conversion Congress and Exposition, ECCE 2010 - Proceedings
SP - 4028
EP - 4034
BT - 2010 IEEE Energy Conversion Congress and Exposition, ECCE 2010 - Proceedings
T2 - 2010 2nd IEEE Energy Conversion Congress and Exposition, ECCE 2010
Y2 - 12 September 2010 through 16 September 2010
ER -