A sampling measurement algorithm without frequency tracking based on electronic instrument transformer;

Current feedback frequency tracking control with matching of piezoelectric;

Research on the Frequency Tracking System of HF-Inverter Power Controlled by PI-DPLL;

A new method based on correlation theory and frequency tracing algorithm is presented .

Through DC input voltage regulation and circuit resonant frequency tracing,approximate linear load power regulation can be realized by the power supply.

because of bridge rectifier adopting APFC technology and inverter adopting the frequency tracing technoiogy of no phase difference, which have very important significance on effective running of power network? frequency conversion power supply and loading.

Experimental results show that the energy transmission system is capable of automatic frequency-tracking and transmission power-adjusting and has stable received energy.

In consideration of the process of card wire heating operation,a strategy of frequency-tracking with integral action separation and DPLL(digital phase-locked loop) is employed to work out a high frequency induction heating power with 100 kHz/5 kW for on-line card wire annealing.

The paper studies digital control scheme of resonance inverter frequency-tracking based on all digital phase-locked loop.

The 100kW inductive heat power frequency track research;

SCM control for frequency tracking in induct heating device;

This paper proposes a control system with the nophase difference of frequency track devised on the basis of the CD4046 integrated phase locked loop.