Abstract
Area for the fast load variation, the power grid voltage fluctuations is very serious. In order to supply stable voltage for the small power user, a unipolar chopping compensation AC regulated power supply is designed based on bidirectional H PWM chopping bridge which can realize the bidirectional flow of energy when the voltage is boosted and step-down. It adopts voltage feedback control. The initial chopping duty ratio is determined by proportion regulation according to difference of the input voltage and the standard voltage; it can improve the voltage response speed. The initial duty ratio is corrected according to digital PID regulation based on the output voltage feedback, which ensures the stability of the output voltage. The STC12C5A62AD single chip is adopted for the regulated power supply that have 8 AD inputs and PWM output, it make the system structure simple. The 12.8 kHz sampling frequency and high precision voltage sampling technology ensures the precision of sampling. The 10 kHz frequency of the chopper reduces the harmonic component and it is easy to filter. Experimental results show that dynamic response speed of the regulated power supply is fast and precision of it is high. It has great practical value.
Highlights
The grid voltage drops off sharply in many areas at peak power, but it rises sharply at power trough
The duty ratio error of output pulse width is less than 1%, the sampling error of the input voltage is less than 1%. they can ensure 1% accuracy of regulated power supply
The voltage high precision sampling and 10 kHz frequency of the chopper is the key for precision of regulated power supply
Summary
The grid voltage drops off sharply in many areas at peak power, but it rises sharply at power trough. Input voltage of power network is ui, output voltage of regulated power supply is u0, the compensation transformer two times electromotive force is ec, positive directions are shown as Fig. 1.
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