| Switching converter may translate one kind of DC electric power into another or more one, and is the main part of DC switching power supply. A general power switching regulation system includes power circuit (viz. switching converter) and control circuit. Both parts interact and work together.There are many kinds of control modes in power switching regulation system, such as voltage-mode control , current-mode control , current-lag-loop-mode control, charge-mode control and so on. The current-mode control can be divided into two modes: average-current-mode control and current-programmed-mode control.Piezoelectric Transformer (Abbrev. PT) is one kind of new element which transfers electrical energy through a mechanical vibration, and will replace traditional transformer in AC-DC converter which is available to small power. PT power converter is one kind of resonance converter which is controlled through frequency conversion and where the order of system is high, and belongs to switching converter.The analytical method of power switching regulation system which has current-mode control is introduced in this paper. In order to reduce the sensitivity that is caused by the fluctuation of input voltage and load in PT power converter, the current-mode control is applied in PT power converter. The author use OrCAD/PSpice10.0 to simulate and analyzethe the model of PT power converter which has current-mode control. That using the current-mode control can compress the frequency band is verified by comparison between two similations. At the same time, the author studys the measurnet method of closed-Loop Characteristics of switching regulation system through using the 43 95A Network /Spectrum/Impedance Analyzer made by Aglient, and take an example of Buck converter with voltage-mode control, the measurent approach is verified by compassion between experimental result andsimulation one.On the base of above approach, The closed-Loop Characteristics of PT power converter which has current-mode control may be measured. |
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