Switch-Mode Power Supplies: SPICE Simulations and Practical Designs, second edition is now completed and the book has been sent to the printer. It took me a while to clean all typos, errors and bad drawings that you, readers friends, have been kind enough to report. The final listing for the 1st edition is posted here. So, what do we have in this second edition? Well, some chapters have been expanded, some simply cleaned up. Here we go for the detailed list:
Chapter 1: the complete derivation of all rms currents in CCM or in DCM for the power switch, the inductor, the diode and the input/output capacitors is now fully documented. All formulas have been tested and several Mathcad files will be available on the editor site to let you calculate these data depending on your design. Not only rms currents are calculated, but also the various time durations in DCM for instance. Convenient tables summarize constraints at the end of each subsection.
Chapter 2: on top of the classical PWM gain derivation, a feedforward small-signal block has now been described. The complete small-signal model of the PWM switch operated in current mode has been added and simulated. Duty ratio factories have been described to show how you can get the ac response of a DCM or a CCM current mode converter with a voltage-mode model by adding a single in-line equation to the existing model. Sub-harmonic instabilities are not predicted but low-frequency response for both modes perfectly agrees with that of higher order models. For those interested in small-signal modeling, I added an appendix in which I derive the ac response of a voltage-mode boost converter operated in DCM. You will see that despite previous SSA prediction, DCM converters are still second-order systems whose quality factor is simply much lower than in CCM.
Chapter 3: the compensator section has been expanded with OTA transfer functions for type 1 and 2. A complete TL431 bipolar-based model has now been included in this new edition
Chapter 4: some new SPICE blocks have been described and in particular, a corrected D flip-flop which is now more robust to forbidden input states.
Chapter 5: clean-up of the existing section mainly
Chapter 6: I have included a complete small-signal analysis of a BCM PFC stage when operated in current or voltage mode control. I also added a section letting you predict what the bulk minimum voltage will be when you have selected a normalized capacitor. This is important to know this bulk valley voltage as the converter will have to pass 100% of the power while in this input range.
Chapter 7: this chapter now includes a complete explanation of the over power phenomenon in flyback converters operated in CCM, DCM or in quasi-resonance (QR). Over power protection or OPP, is an important part of the flyback design. It is there to compensate the extra output power (hence current) a flyback converter will deliver when supplied from its highest input voltage. If no precautions are taken, risks of fire or destruction exist. This new section explains the origin of this output power runaway and how to compensate it. Small-signal has not been left aside and a small-signal model of the QR flyback converter in current mode is presented. A section showing how to account for the nonlinear variation of the Coss capacitor has been added as well as a simple laboratory circuit to check for transformer saturation.
Chapter 8: the complete transfer function of the active clamp forward converter operated in voltage mode has been added with step by step derivation as well as tests a against prototype response. Compensation details for a 30-A dc-dc are also offered. The coupled inductor small-signal response has also been revamped thanks to comments from a sharp reader.
