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Pulse-Frequency-Modulated Digital Control of Power Supply Without Analog-to-Digital Converter Using Positive-Sloped Ramp Wave Injection

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3 Author(s)
Hwu, K.I. ; Inst. of Electr. Eng., Nat. Taipei Univ. of Technol., Taipei, Taiwan ; Chuang, C.F. ; Yau, Y.T.

In this paper, a counter-based pulse-frequency-modulated (PFM) control strategy according to the output voltage ripple using a one-comparator scheme without any analog-to-digital converter (ADC) used is presented, which is realized based on the field programmable gate array (FPGA) and applied to DC-DC converters. However, too small or distorted output ripple limits its performance. Consequently, a positive-sloped ramp wave injection method is used to overcome this problem and enhances its application capability significantly. First of all, the details of the positive-sloped ramp wave injection method are illustrated, and second some experimental results are provided to verify the effectiveness of the proposed control strategy.

Published in:

Industrial Informatics, IEEE Transactions on  (Volume:9 ,  Issue: 2 )

Date of Publication:

May 2013

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