Switching power converter design and control are often constrained by the performance of available devices. This is particularly true in low-voltage circuits. A method for creating high-performance switch modules from power transistors and simple control circuits is presented. The method is based on switching function principles: any type of switch can be represented by an ideal switch in combination with basic logic elements. These high-performance modules can be configured to emulate diodes, thyristors, special resonant devices, or nearly any other switch type. The control is autonomous—it depends on the terminal behavior and external gate signals and requires no additional information from the application circuit. Experimental examples of several switch modules in low-voltage power converters are given. The experimental modules use power MOSFET’s and give performance similar to that of synchronous rectifiers but with much greater flexibility. For instance, a module configured to emulate an SCR shows voltage drops below 0.25 V at several amperes of forward current.
ASJC Scopus subject areas
- Control and Systems Engineering
- Electrical and Electronic Engineering