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5/26/2013

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Click image to enlarge Figure 1: Schematic of the flyback converter. After the transformer is inserted, the elements in green have to be selected and tuned.

Flyback Power Supply Development Part IV

Dr. Ray Ridley, President, Ridley Engineering

5/16/2013

Fourth of a series on designing and building an offline flyback converter

Power Transformer Testing Figure 1 shows the schematic of the flyback converter with the transformer inserted into the circuit. Before applying the full load on the circuit, the elements in green have to be selected and tuned for proper operation. Current limiting

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Articles

12/22/2012	Input Impedance Measurements and Filter Interactions Part II Dr. Ray Ridley, Managing Director, Ridley Engineering In this article, Dr. Ridley continues the discussion of power supplies with input filters. He shows how the output impedance of the input filter is measured, and demonstrates the importance of input filter . . . Read More
11/10/2012	Input Impedance Measurements and Filter Interactions Part I Dr. Ray Ridley, Managing Director, Ridley Engineering In this article, Dr. Ridley continues the discussion of input impedance measurements, and shows the effect of properly locating all of the input filter components. Middlebrook’s input filter stability . . . Read More
9/7/2012	Input Impedance Measurements Dr. Ray Ridley Managing Director Ridley Engineering In this third part of this series of articles, Dr. Ridley discusses the fourth important frequency-response measurement made during full characterization of a switching power supply. The closed-loop input . . . Read More
5/18/2012	Manual Frequency Response Measurements for Magnetics - Part II Dr. Ray Ridley Managing Director Ridley Engineering In this article, Dr. Ridley provides further insight into frequency response measurements of transformers and inductors using equipment that you probably already have in your laboratory. An improved signal . . . Read More
4/14/2012	Manual Frequency Response Measurements for Magnetics Dr. Ray Ridley, President, Ridley Engineering In this article, Dr. Ridley describes how you can make frequency response measurements of transformers and inductors using equipment that you probably already have in your laboratory. This is very . . . Read More
3/6/2012	Hardware Testing and Computer Simulation Dr. Ray Ridley, President, Ridley Engineering In over 30 years of designing power supplies, I have written multiple computer programs to help design, simulate, and understand power supply operation. This has culminated in Release 9 of POWER 4-5-6, . . . Read More
3/2/2012	Flyback Transformer Primary Winding Structures Dr. Ray Ridley, President, Ridley Engineering Dr. Ridley shows how the intricate details of magnetics construction can have a major impact on the operation of a flyback converter. Flyback Transformer Primaries If you are designing . . . Read More
1/7/2012	Designing a Two-Stage Output Filter for Low Output Impedance Dr. Ray Ridley, President, Ridley Engineering Dr. Ridley demonstrates how the proper configuration of a second-stage output filter can significantly lower the output impedance of your power supply. The correct arrangement of components is . . . Read More

Dr. Ray Ridley
Contributing Editor
President, Ridley Engineering

Dr. Ridley is perhaps best-known in the industry for his landmark work on current-mode control which clarified exactly how the system should be analyzed for the best accuracy and practicality. This work has now been the standard for current mode analysis for over 20 years.

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