This figure shows how these constraints should look in a BDD.This article needs additional citations for verification. The Source constraint defines the voltage as a sine wave with the current simulation time as a parameter. The Ground constraint states that the voltage at the Ground pin is zero. The sum of the currents going through the two pins must add up to zero (one is the negative of the other). The current of the component is equal to the current going through the positive pin. The equations should state that the voltage of the component is equal to the difference between the voltages at the positive and negative pins. Parameters of Constraint Blocks correspond to SimVariables and SimConstants of Blocks ('i', 'v', 'r' in this example), as well as to SimVariables present in the type of the Ports ('pv', 'pi', 'nv', 'ni' in this example).Ĭreate a Constraint Block 'TwoPinComponentConstraint' to define parameters and equations common to sources and resistors. In SysML, equations are represented as constraints in Constraint Blocks. Notice that this follows the same structure as the original circuit diagram, but the symbols for each component have been replaced with properties typed by the Blocks we have defined.Įquations define mathematical relationships between numeric properties. The Ground is also connected to the negative pin of the Source. The positive pin of the Resistor is connected to the negative pin of the Source. The positive pin of the Source is connected to the negative pin of the Resistor. Add properties for the Source, Resistor and Ground, typed by the corresponding Blocks. This figure shows what the BDD should look like, with the Blocks Circuit, Ground, TwoPinComponent, Source and Resistor.Ĭreate an Internal Block diagram (IBD) for Circuit. The two Ports are named 'p' (positive) and 'n' (negative), and they are of type ChargePort. Create an abstract block 'TwoPinComponent' with two Ports (pins).

Electricity (electric charge) is transmitted through the pins. The ground has only one pin, which is positive. The source and resistor have a positive and a negative pin. The three parts of the Circuit Block are connected through Ports, which represent electrical pins. Create a Block for each of these part types. These parts are of different types, with different behaviors. The circuit has three parts: a source, a ground, and a resistor. Create a Circuit Block in a Block Definition diagram (BDD). In SysML, the circuit and each of the components will be represented as Blocks.

This type allows us to represent the electrical energy at the connectors between components.

Additionally, define a composite type called ChargePort, which includes properties for both Current and Voltage.

Simple electrical circuit diagram maker