A method to improve a resolution of digital PWM generator for DC-DC converter control

In recent years, digitization of all control parts in switching power supplies including PWM generators is progressing for demands such as intelligent performances and common use of hardware, etc. Then, a problem is in the resolution of digital PWM generators for improving control performances. Sinc...

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Bibliographic Details
Main Authors: Takegami, E., Higuchi, K., Nakano, K., Tomioka, S., Watanabe, K.
Format: Conference Proceeding
Language:English
Subjects:
Clocks
Counting circuits
DC-DC power converters
Hardware
Power generation
Power supplies
Pulse width modulation
Pulse width modulation converters
Switching frequency
Voltage
Online Access:Request full text
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Summary:In recent years, digitization of all control parts in switching power supplies including PWM generators is progressing for demands such as intelligent performances and common use of hardware, etc. Then, a problem is in the resolution of digital PWM generators for improving control performances. Since the digital PWM generator is constituted using a counter, a carrier wave turns into a stairs wave, and step amplitudes is decided with a clock cycle. When the clock cycle is fixed, the resolution becomes low as the switching frequency becomes high. Consequently, the accuracy of output voltage becomes bad. In this paper, a method for remarkably improving the resolution of the digital PWM generator using the pulse composite technique is proposed. The method is realizable by some parts and easy computation, and is applied to the digital PWM generator built-in DSP. The usefulness and practicality are verified by experiments
ISSN:2165-3011
2165-302X
DOI:10.1109/CACSD-CCA-ISIC.2006.4777141