This paper proposes a synchronization method of two-phase harmonic oscillators, based on amplitude and phase control, employing variable structure control approach. Synchronization between referent and controlled oscillator is achieved using variable structure controller, which organizes sliding mode along the intersection of two sliding surfaces. Mathematical analysis and experimental results are presented.

On the basis of the theory of variable structure systems, a new method for the synthesis of high-quality triangular wave oscillators has been proposed. The proposed oscillator features a finite oscillation build-up time, and the negative influence of the high-frequency control signal on the quality of output signals, chattering, is eliminated.

On the basis of the theory of variable structure control systems (VSCS) with sliding modes, a new mathematical method for the design of high performance electronic triangular- and parabolic wave generators has been proposed. Theoretically obtained results were verified experimentally using a conservative oscillator controlled by a microprocessor.

In this paper we investigate the performances of four types of variable structure controllers (VSC) both in the undisturbed motion and under the influence of disturbance and noise. Two compared controllers, continuous time VSC (CTVSC) and discrete time VSC (DTVSC) are well known, while discrete time dual rate VSC (DTDRVSC) and fuzzy VSC (FVSC) are new control structures. Digital simulation results presented in this paper clearly show that new controllers in comparison with classical VSC have some real advantages.