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.

Keywords:

AC regulated power supply, feedback control, PWM control, series compensation,

References

Competing interests

The authors have no competing interests.

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The authors have no competing interests.