Vector Logit model

Phase method

Logit model in sinusoidal steady-state circuit analysis

resist

admittance

Ohm's Law

algebraic equation

inductance

Capacitance capacitance

Impedance impedance

Direct circuit of DC circuit

cyclic current method

Joint node method

superposition theorem

thevenin's theorem

Equivalent source theorem

abstract

Phase analysis method of sinusoidal steady-state circuit. The phase method is to represent the voltage sum circuit as phase, the RLC component as resistance or admittance, and then sketch the phase model of the circuit, and write the algebraic equation of unknown voltage and circuit phase with the phase composition of KCL, KVL and Ohm's law.

By introducing the phase method, the definitions of resistance and admittance are established, and the phase compositions of KCL, KVL and Ohm's law are given. Because their forms are exactly the same as those used to analyze DC circuits, the phase model of sinusoidal circuits can be directly analyzed by the methods, principles and laws used to analyze DC circuits, such as mesh method (loop current method), combination method, superposition theorem, Thevenin theorem and equivalent source theorem. The difference is that (1) does not refer to the instantaneous expressions of voltage and current when expressing all relations, but takes the form of corresponding phases; (2) The corresponding calculation is not algebraic calculation but complex calculation, so the calculation is more difficult than that of direct circuit. According to the characteristics of complex number calculation, with the help of the geometric relationship in the phase diagram, we can draw the phase diagram, simplify the calculation, and thus expand the ideas and methods of solving problems.

Key words: potassium chloride, KVL, resistance, inductance, capacitance, impedance, admittance, sinusoidal cross circuit.