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| Duty Ratio Prediction Control Method With Time Delay Compensation |
| Sun Pengju, Zhou Luowei, Du Xiong |
| Chongqing University Chongqing 400044 China |
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Abstract A duty ratio prediction method and an improved duty ratio prediction method based on linear extrapolation are proposed in order to compensate the inherent time delay introduced by zero-order-hold effect and the computational time delay in digital control systems. The duty ratio of next period can be predicted using current duty ratio and last duty ratio with these methods. With the proposed schemes, the time delay of control loop is compensated and the dynamic performance is improved. It is shown that, compared with conventional digital control, the control loop bandwidth can be improved significantly with the proposed techniques. Experimental results on a point of load DC/DC converter show the effectiveness of the proposed schemes, which demonstrate that the proposed strategies offer a practical and straightforward way to compensate the time delay of digital control switching converters and improve over the existing designs.
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Received: 21 February 2009
Published: 04 March 2014
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2010, Vol. 25 
