Latter development rises the control method that be being controlled without the model is the switch power supply with broad perspective. It does not count the mathematical model of object be accusinged, collect builds model and control unifinication, this to a few complex and alterable or structural inaccuracy uses accurate mathematical model hard surely is very appropriate descriptive system, improved the control system of switch power source, what satisfy switch power source not only is high-powered the requirement with high reliability.
1, foreword

Develop as the high speed of technology of electric power electron, the relationship of the job of equipment of electric power electron and people, life is increasingly close, and electronic equipment cannot leave reliable power supply. Switch power source is to use technology of electron of contemporary electric power, control the time rate that switch transistor debuts and involves, maintain stability to output a kind of power source of voltage, switch power source is common by pulse width modulation (PWM) control IC and MOSFET are formed. Design and great majority of part of switch report source control works according to imitate signal, defect is interference rejection ability very poor. Because the computer controls development of land of technical advance rapidly, the processing of digital signal and control showed clear advantage: Facilitating computer is handled and control, the flexibility of the design rises greatly, software is debugged convenient etc, appeared PID control.

It makes switch power source is changed to digitlization, intelligence, muti_function change directional development. This raised the function of switch power source and dependability undoubtedly. But because itself of switch power source is a nonlinear object, its are accurate of the model building is quite difficult, often use approximate processing, and its power supply system and laden change have uncertainty, use afore-mentioned imitate or method of digital PID control to often make the parameter of PID adjuster changes subsequently hard so, control effect is not ideal. Latter development rises be being controlled without the model is the control method with wide perspective. It does not count the mathematical model of object be accusinged, collect builds model and control unifinication, this to a few complex and alterable or structural inaccuracy uses accurate mathematical model hard surely is very appropriate descriptive system, improved the control system of switch power source, what satisfy switch power source not only is high-powered the requirement with high reliability.

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　　2, the working principle of switch power source
　　
Block diagram of this principle of switch power source is shown 1 times like the graph. Voltage of electrified wire netting passes the commutator in inputting loop and filter changeover to input high frequency transformer for volts d.c. , high frequency transformer is the volts d.c. change of the input voltage of square wave of high frequency pulse, this pulse square wave turns volts d.c. into supply load through outputting the high frequency commutator in loop and filter.
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