Unified modeling and measurement of current-programmed converters

A unified model is established for a current-programmed converter, which is both a modification and an extension of familiar models. Inclusion of the sampling effect allows the presence of an additional pole in the current-loop gain to be inferred. The resulting final double-slope asymptote is fixed in position, and the crossover frequency cannot exceed half the switching frequency. A new stability parameter, Q/sub s/, determines the additional pole and describes the degree of peaking in the closed-loop transfer functions. Experimental verification uses an analog signal injection technique.<<ETX>>

[1]  Dragan Maksimovic,et al.  A unified analysis of PWM converters in discontinuous modes , 1991 .

[2]  R. Redl.  High-frequency extension of the small-signal model of the constant-frequency current-mode-controlled converter , 1991, [Proceedings] APEC '91: Sixth Annual Applied Power Electronics Conference and Exhibition.

[3]  R. D. Middlebrook.  Low-entropy expressions: the key to design-oriented analysis , 1991, Proceedings Frontiers in Education Twenty-First Annual Conference. Engineering Education in a New World Order.

[4]  F. C. Lee,et al.  A unified analysis and design procedure for a standardized control module for dc-dc switching regulators , 1980, 1980 IEEE Power Electronics Specialists Conference.

[5]  Cecil Deisch,et al.  Simple switching control method changes power converter into a current source , 1978, 1978 IEEE Power Electronics Specialists Conference.

[6]  R.D. Middlebrook,et al.  A unified analysis of converters with resonant switches , 1987, IEEE Power Electronics Specialists Conference.

[7]  G. Verghese,et al.  Averaged and sampled-data models for current mode control: a re-examination , 1989, 20th Annual IEEE Power Electronics Specialists Conference.

[8]  A. Capel,et al.  Application of the injected current model for the dynamic analysis of switching regulators with the new concept of LC3 modulator , 1978, 1978 IEEE Power Electronics Specialists Conference.

[9]  R.D. Middlebrook,et al.  Modelling and analysis of switching DC-to-DC converters in constant-frequency current-programmed mode , 1979, 1979 IEEE Power Electronics Specialists Conference.

[10]  Slobodan Cuk,et al.  A general unified approach to modelling switching-converter power stages , 1976, 1970 IEEE Power Electronics Specialists Conference.

[11]  Slobodan Cuk,et al.  A general unified approach to modelling switching-converter power stages , 1977 .

[12]  R. D. Middlebrook,et al.  Topics in Multiple-Loop Regulators and Current-Mode Programming , 1987, IEEE Transactions on Power Electronics.

[13]  R. B. Ridley,et al.  A new, continuous-time model for current-mode control (power convertors) , 1991 .

[14]  Robert M. Tedder,et al.  An alternate analysis of the current programmed model leads to simplified input filter design criteria (power convertors) , 1992, [Proceedings] APEC '92 Seventh Annual Applied Power Electronics Conference and Exposition.