Frequency conversion technology is a kind of conversion technology that converts direct current to alternating current of different frequencies. It can convert alternating current to direct current, then convert it to alternating current of different frequencies, convert direct current to alternating current, then convert alternating current to direct current. In short, all of these only change the frequency, the electrical energy.

 Principle of intelligent control system

 Control theory is an interdisciplinary branch of engineering mathematics, which mainly deals with the behavior of dynamic systems with input signals. The external input to the system is called the reference value. One more variables in the system need to change with reference values. The controller processes the input of the system so that the output of the system can achieve the desired effect.

  The general purpose of the control theory is to stabilize the system by the action of the controller, that is, the system remains at the set value does shake near the set value.

 Continuous systems are usually represented by differential equations. If the differential equation is a linear constant coefficient, then the differential equation can be transformed into Laplace, the relationship between its input output is represented by a transfer function. If the differential equation is nonlinear its solution has been found, the nonlinear equation can be linearized around the solution. If the coefficient of the linearized differential equation is constant, the transfer function can also be obtained by Laplace transformation.

  Transfer functions are also known as system functions network functions. It is a mathematical symbol that uses the frequency of time space to express the relationship between input output in a linear constant coefficient system.