Since its introduction in 1977, the Power Supply Design Seminar series provides rich, technical and practical presentations which combine new advanced power supply concepts, basic design principles and "real-world" application examples. Whether this seminar is used to gain fresh knowledge of power supply design, or as a review for those experienced in power supply design, the topics presented will be worthwhile for all levels of expertise.
|Long Island, NY||4/10/2018|
|Santa Clara, CA||4/10/2018|
|Minneapolis, MN||4/24 /2018|
|PSDS 2018 Agenda|
|8 to 8:30 a.m.||Welcome and badge pick up|
|8:30 to 9:30 a.m.||Survey of Resonant Converter Topologies|
|9:30 to 10:30 a.m.||Control and Design Challenges for Synchronous Rectifiers|
|Break (10:30 10:45 a.m.)|
|10:45 to 11:45 a.m.||Comparison of GaN and Silicon FET-Based Active Clamp Flyback Converters|
|11:45 to 12:45 p.m.||Lunch + Power Design Made Easy with Power Stage Designer™|
|Break (12:45 to 1 p.m.)|
|1 to 2 p.m.||Power Solutions for Class-D Audio Amplifiers|
|2 to 3 p.m.||Common Mistakes in DC/DC Converters and How to Fix Them|
|Break (3 to 3:15 p.m.)|
|3:15 to 4:15 p.m.||Considerations for Measuring Loop Gain in Power Supplies|
Starting with 2- and 3-element resonant topology fundamentals, this session walks through the key characteristics, analysis methodology, control challenges and design considerations of resonant topologies. Three design examples demonstrate resonant topology performance with high switching frequency (~1 MHz) or with wide output voltage regulation range (2 to 1 output voltage regulation level). This session also introduces a new resonant topology structure, the CLL resonant converter, with size and efficiency advantages over the traditional LLC series resonant converter. Finally, this session provides guidance on how to select the best resonant topology for various applications.
To improve power supply efficiency to meet stringent standards, a synchronous rectifier (SR) often replaces the diode rectifier. Based on loss breakdown, this session explains how to achieve efficiency improvement and presents design criteria for selecting a suitable SR MOSFET, balancing between conduction and switching losses. Also, SR control methods are discussed, including Vds sensing, volt-second sensing and self-driven. The pros and cons of each control method are discussed in detail. Some design challenges, including noise immunity, fast turn off, high-side and low-side SR and special current shapes, such as LLC converters, are also discussed.
This session demonstrates how an active clamp flyback converter achieves zero voltage switching (ZVS) and recycles the leakage energy of the transformer to improve efficiency in higher frequency operation. Although it is well known that switch-node capacitance determines the circulating energy for ZVS, the capacitance-nonlinearity impact from each of the two primary-side switches and from the secondary synchronous rectifier has not been well understood. In this session, design tradeoffs with differing nonlinearity of junction capacitances from each of the switching devices are investigated across full load to deep light load operation, and then proper control strategies to overcome the capacitance nonlinearity are proposed. Additionally, analytical equations and design procedures are developed with consideration to the nonlinearity impact. Finally, the above studies and control method are supported with experimental results and simulation results on a 30 W adapter using state-of-the-art GaN and silicon FETs.
This session demonstrates how Power Stage Designer™ speeds up design and analysis of switch mode power converters. Power Stage Designer calculates voltages and currents of 20 topologies according to the user’s inputs. Additionally, Power Stage Designer contains a Bode plotting tool and a helpful toolbox with various functions for power supply design. This session walks through the many features of Power Stage Designer and explains the calculations behind these functions.
Today, the most popular medium- and high-power audio amplifiers employ a Class-D working scheme due to high efficiency and excellent linearity. Compared to traditional analog amplifiers, Class-D uses high frequency pulse width modulation, similar to a switch mode power supply. Even though Class-D amplifiers incorporate negative feedback on supply voltage, the reality is that the output impedance of the power supply has an impact on audio quality. This topic describes how to properly design a power supply for a high-power Class-D amplifier based on the output impedance requirements as well as on typical requirements like average and peak power demands. Two different built and tested power reference designs are introduced. The first is for a universal AC/DC input suitable for home theatre, monitor and soundbar applications. The second solution covers high-power automotive applications rated to several hundred watts.
If you want to learn from the mistakes of others, this session is for you. This practical presentation goes through a number of common mistakes in point-of-load DC/DC converter design and testing. With an engaging, interactive format, this session covers issues found in converter capabilities, component selection, control design, board layout and measurement techniques. The causes of the design mistakes and how to avoid them in future designs are explained.
Loop gain measurements show how stable a power supply is and provide insight to improve output transient response. This presentation discusses the theory of open-loop transfer functions and empirical loop gain measurement methods. The presentation then demonstrates how to configure the frequency analyzer and prepare the power supply under test for accurate loop gain measurements. Examples are provided to illustrate proper loop gain measurement techniques.