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Título del libro: Conference Proceedings - Ieee Applied Power Electronics Conference And Exposition - Apec
Título del capítulo: A very fast control based on hysteresis of the Cout current with a frequency loop to operate at constant frequency

Autores UNAM:
OSCAR PROSPERO GARCIA;
Autores externos:

Idioma:
Inglés
Año de publicación:
2009
Palabras clave:

Buck converters; Constant frequency; Design and analysis; Fast control; Fast transient response; Frequency variation; Hysteretic control; Input and outputs; Linear controls; Non linear control; Nonlinear loop; Steady state; TO effect; Very fast transients; Voltage step; Damping; Electric power supplies to apparatus; Hysteresis; Linear control systems; Power control; Power electronics; Stiffness; Switching frequency; Transient analysis; Frequency response


Resumen:

The combination of non-linear control and linear control proposed in [1] provides very fast transient response (voltage step from 1 V to 1.5 V in 2 µs). This non-linear control is based on hysteretic control of the C out current. This system is very sensitive to effects like aging, temperature, input and output voltage variation, etc., that modify the switching frequency. This paper proposes a frequency loop to avoid the frequency variation and to adjust the switching frequency to the nominal value by changing the hysteretic band. The design and analysis of the nonlinear loop, the voltage loop and frequency loop are presented in detail with a design example. A 5 MHz buck converter is developed and experimental results validate the loops design, obtaining the same fast transient response (from 1.5 V to 2.5 V in 2 µs) but keeping constant the switching frequency in steady state. ©2009 IEEE.


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