A PLL is a control system that locks onto the phase of an input signal and continuously tracks it, ensuring a stable and synchronized reference for timing or control purposes.
Down Sample
Performs signal downsampling by updating the output only once every N input samples. Between updates, the last output value is held constant.
Key features:
- Reduces the update rate of a high‑frequency signal to match slower processing loops.
- Outputs the input value once every N samples; otherwise holds the previous value.
- Typical usage: rate matching between fast acquisition loops and slow control or estimation loops.
Track Peak ABC
Tracks the maximum value of three input signals (A, B, C) over a defined window of N samples.
Key features:
- Monitors the peak value of each signal within the current sample window.
- Updates the three peak outputs only after N samples have elapsed.
- Automatically resets for the next measurement interval.
- Suitable for periodic peak detection in grid‑synchronized voltage or current measurements.
Theta Shift
Applies a fixed phase shift to a positive input angle and wraps the result within the interval [0, 2π).
Key features:
- Computes:
θ_out = θ_in + θ_shift, with automatic wrap‑around. - Accepts only positive input angles in radians.
- Ensures the resulting angle stays within the valid circular domain.
PLL Kalman
A phase‑locked loop based on a Kalman filter.
It estimates the system phase by detecting the peak of phase A and generating a synchronized triangular reference aligned to that peak.
Key features:
- Implements the core functionality of a classical PLL using Kalman‑based estimation.
- Tracks the fundamental phase with improved noise rejection and stability.
- Generates a triangular or equivalent reference signal synchronized to the detected phase.
- Useful for precise angle estimation in noisy environments or grid‑tied applications.