A small signal analysis approach of a dual forward converter with non-ideal transformer in current-programmed control (CPC) has been investigated in this paper. A small-signal model has been derived to determine the small-signal characteristics of the converter. By employing this model, the following significant features have been revealed or explained: (1) if the artificial ramp slop is properly selected, the ideal line-to-output transfer function of the converter becomes zero. That is to say, the output voltage fluctuation of causing from a perturbation of the DC bus voltage can be substantially restrained; (2) the CPC can greatly reduce the Q-factor and make the converter to become a low Q-factor system; (3) the current- programmed control can extend the bandwidth; (4) the magnetizing inductor plays an important role in the converter, so we must consider it when we design the control circuit.
[1]
S. Ollero,et al.
Peak current mode control applied to the forward converter with active clamp
,
1998,
PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).
[2]
Weiping Zhang,et al.
Small-Signal Analysis of CPC-Single Stage AC/DC Converter with PFC
,
2006,
TENCON 2006 - 2006 IEEE Region 10 Conference.
[3]
Byung-il Kwon,et al.
Forward converter analysis by the method of coupling electromagnetic field with hysteresis and circuit equations
,
2000
.
[5]
P.R.K. Chetty.
Modeling and Design of Switching Regulators
,
1982,
IEEE Transactions on Aerospace and Electronic Systems.