Instability monitoring in boost converters by resonant perturbation and control

Introduces a method for monitoring power electronic converters to detect impending instability. The method involves using a perturbation signal that is near-resonant with respect to a possible period doubling instability. A system output variable is monitored to detect any significant amplification of the probe signal. The method can be applied either to the circuit itself or to a model run in parallel to the circuit. It is found that, in addition to providing a warning of impending instability, the perturbing signal increases the system stability margin