Generic spice compatible model of current feedback in switch mode convertors

Abstract

frequency to retain the triangular shape of the inductor current. It will be assumed in the following, therefore, that.the output signal of amplifier A, includes a remnant of the inductor current triangular waveform (except for possible curvature of the corners) multiplied by a constant (kJ. In CM realisation (Fig. 2), the output of the error amplifier V;, modified by a 'compensation slope' Mc [1] is compared to the inductor current IL having a rising slope k,ml' a falling slope k,m2 and low frequency component A. The average SIM D' generator SIM

Average simulation of PWM converters by direct implementation of behavioural relationships

“…10) was translated to a PSpice-compatible file by applying the template subcircuits given in Appendix B. Simulation results obtained by applying the proposed behavioural models were found to be in good agreement with previously published (Amran er a/. 1991, Ben-Yaakov and Gaaton 1992, Nagel 1975 The power of the proposed direct simulation approach is exemplified by the results of a number of key analyses. Figure I1 presents the small signal control-tooutput (v,,,VE) transfer function for a 1.5R load.…”

“…The switched inductor model (SIM) (Ben-Yaakov 1989, Ben-Yaakov er al. 1990, Kimhi and Ben-Yaakov 1991, Amran et al 1991, Ben-Yaakov and Gaaton 1992 developed for PWM and quasi-resonant converters is based on the average behaviour of the switch mode circuit. This inherent feature and the fact that it is topology independent makes the model highly compatible with general-purpose electronic circuit simulators.…”

Comparison of Duty Cycle Generator Algorithms for SPICE Simulation of SMPS

“…Inspection of (2) reveals that under CCM conditions, the term (1 − D on − D off ) vanishes and (2) is reduced to the expression, previously reported in [10]:…”

“…Investigating the modulator waveforms of Figure 3(a), and applying basic geometrical considerations to calculate the area under the v cp curve, as suggested in [10], reveals that the average current programming signal, v cp , D on and D off duty cycles and other circuit parameters are related as follows:…”

The electrothermal macromodel of switching voltage regulators from the L4970 family

“…Currently, SPICE is one of the most popular tools for the analysis of electronic circuits [3,4]. The known models of the components of the switch-mode power supplies (SMPS) [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] accepted by SPICE are the isothermal ones; that means these models are valid at the fixed value of temperature, treated as the ambient temperature. Note that in some of the models even the ambient fixed temperature is not included; that means these models are independent of temperature.…”