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Predictive Digital Peak Current Mode Controller for DC-DC Converters Capable of Operating Over the Full 0-100\% Duty Cycle Range
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| Author(s) |
Karsten Holm ANDERSEN |
| Abstract |
In this paper, a high performance fully digital peak current mode controller for DC-DC converters whichsupports the full duty cycle range from 0-100\% is presented. Support for low duty cycle is very importantduring short circuit or converter overload and support for high duty cycle is important for faster responseduring a transient and for providing a larger output voltage range. The digital current controller is basedon a new method, which estimates the inductor current in the middle of the falling current slope. Theestimated inductor current is based on sampling the inductor current in either the rising or fallinginductor current depending on the duty cycle of the switching period. The controller uses the estimatedinductor current to calculate the inductance of the inductor in order to optimally predict and control thecurrent loop. The controller can be used in both continuous (CCM) and discontinuous conduction mode(DCM) and supports high switching frequencies even with low cost A/D converters. The proposedcontroller is implemented in a Field Programmable Gate Array (FPGA) to control a 450 W buckconverter and the experimental results verify the controller's capability to operate in the full duty cyclerange of 0-100\%. The experimental results furthermore demonstrate the achievement of a very fastdigital controller with a crossover frequency about 1/10 of the switching frequency, which is comparableto that obtained by analog peak current mode control. |
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| Filename: | 0552-epe2017-full-13380494.pdf |
| Filesize: | 901.4 KB |
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| Type |
Members Only |
| Date |
Last modified 2018-04-17 by System |
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