Puls Voltage

Symbol

Information

A Pulsed Voltage Source generates a square wave voltage signal based on the following equation:

\[\begin{split}V(t) = \begin{cases} V_a + V_{off}, & 0 \leq t < D \cdot T \\ V_{off}, & D \cdot T \leq t < T \end{cases}\end{split}\]

Where:

\(V(t)\) is the output voltage at time \(t\)
\(V_a\) is the amplitude of the pulse voltage (Volts)
\(V_{off}\) is the offset voltage (Volts)
\(T\) is the period of the waveform (Seconds)
\(D\) is the duty cycle (Percentage, %)

Ports

p: Positive terminal
n: Negative terminal

Model

The PulsVoltage model generates a square wave voltage signal.

This model is useful for digital circuits, clock signals, and switching power applications.

Attributes:

V (signal): Output voltage across terminals (p, n).

Va (param): Amplitude of the pulse voltage, default is 1 V.

T (param): Period of the waveform, default is 0.1 sec.

D (param): Duty cycle percentage, default is 50%.

Voff (param): Offset voltage, default is 0 V.

Methods:

analog(): Implements the square wave voltage output equation.

\[\begin{split}V = \begin{cases} V_a + V_{off}, & \text{when pulse is ON} \\ V_{off}, & \text{when pulse is OFF} \end{cases}\end{split}\]

from pyams.lib import model, signal, param, time
from pyams.lib import voltage

class PulsVoltage(model):
    """
    Pulsed Voltage Source Model.
    """

    def __init__(self, p, n):
        # Signal declaration
        self.V = signal('out', voltage, p, n)

        # Parameter declarations
        self.Va = param(1.0, 'V', 'Amplitude of square wave voltage')
        self.T = param(0.1, 'Sec', 'Period')
        self.D = param(50, '%', 'Duty cycle')
        self.Voff = param(0.0, 'V', 'Offset voltage')

    def analog(self):
        """Defines the square wave pulse voltage equation."""
        t = time.value  # Get the current simulation time
        cycle_time = t % self.T  # Time within the current period

        if cycle_time <= (self.D / 100.0) * self.T:
            self.V += self.Va + self.Voff  # Pulse ON
        else:
            self.V += self.Voff  # Pulse OFF

Command syntax

The syntax for defining a pulsed voltage source in a PyAMS simulation:

# Import the model
from pyams.models import PulsVoltage

# Vname: is the name of the voltage source instance
# p, n: The connection points in the circuit
Vname = PulsVoltage(p, n)