model IdealOpAmpLimited "Ideal operational amplifier with limitation"
Interfaces.PositivePin in_p "Positive pin of the input port"
annotation (Placement(
transformation(extent = {
{-110, -70},
{-90, -50}}),
iconTransformation(extent = {
{-110, -70},
{-90, -50}})));
Interfaces.NegativePin in_n "Negative pin of the input port"
annotation (Placement(
transformation(extent = {
{-110, 50},
{-90, 70}}),
iconTransformation(extent = {
{-110, 50},
{-90, 70}})));
Interfaces.PositivePin out "Output pin"
annotation (Placement(transformation(extent = {
{90, -10},
{110, 10}})));
Interfaces.PositivePin VMax "Positive output voltage limitation"
annotation (Placement(
transformation(extent = {
{-10, 90},
{10, 110}}),
iconTransformation(extent = {
{-10, 90},
{10, 110}})));
Interfaces.NegativePin VMin "Negative output voltage limitation"
annotation (Placement(
transformation(extent = {
{-10, -110},
{10, -90}}),
iconTransformation(extent = {
{-10, -110},
{10, -90}})));
SI.Voltage vin "input voltage";
protected
Real s(start = 0, final unit = "1") "Auxiliary variable";
constant SI.Voltage unitVoltage = 1 annotation (HideResult = true);
equation
vin = in_p.v - in_n.v;
VMax.i = 0;
VMin.i = 0;
in_n.i = 0;
in_p.i = 0;
out.v = smooth(0, if s < -1 then VMin.v else if 1 < s then VMax.v else 0.5 * ((VMax.v - VMin.v) * s) + 0.5 * (VMax.v + VMin.v));
in_p.v - in_n.v = unitVoltage * smooth(0, if s < -1 then s + 1 else if 1 < s then s - 1 else 0);
annotation (
defaultComponentName = "opAmp",
Documentation(
info = "<html>\n<p>\nThe ideal OpAmp with limitation behaves like an ideal OpAmp without limitation,\nif the output voltage is within the limits VMin and VMax. In this case\nthe input voltage vin = in_p.v - in_n.v is zero.\nIf the input voltage vin less than 0, the output voltage is out.v = VMin.\nIf the input voltage is vin larger than 0, the output voltage is out.v = VMax.\n</p>\n</html>",
revisions = "<html>\n<ul>\n<li><em> 1998 </em>\n by Christoph Clauss<br> initially implemented<br>\n </li>\n</ul>\n</html>"),
Icon(
coordinateSystem(
preserveAspectRatio = true,
extent = {
{-100, -100},
{100, 100}}),
graphics = {
Line(
points = {
{60, 0},
{90, 0}},
color = {0, 0, 255}),
Polygon(
points = {
{70, 0},
{-70, 80},
{-70, -80},
{70, 0}},
fillColor = {255, 255, 255},
fillPattern = FillPattern.Solid,
lineColor = {0, 0, 255}),
Line(
points = {
{-100, 60},
{-70, 60}},
color = {0, 0, 255}),
Line(
points = {
{-100, -60},
{-70, -60}},
color = {0, 0, 255}),
Line(
points = {
{-60, 50},
{-40, 50}},
color = {0, 0, 255}),
Line(
points = {
{-50, -40},
{-50, -60}},
color = {0, 0, 255}),
Line(
points = {
{-60, -50},
{-40, -50}},
color = {0, 0, 255}),
Line(
points = {
{70, 0},
{100, 0}},
color = {0, 0, 255}),
Line(
points = {
{-45, -10},
{-10, -10},
{-10, 10},
{20, 10}},
color = {0, 0, 255}),
Text(
extent = {
{-150, 150},
{150, 110}},
textString = "%name",
lineColor = {0, 0, 255}),
Line(
points = {
{0, 40},
{0, 100}},
color = {0, 0, 255}),
Line(
points = {
{0, -100},
{0, -40}},
color = {0, 0, 255})}));
end IdealOpAmpLimited;