Integrated switched-mode power supplies with digital control enabling fast transient responses and parameter identification

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Quenzer-Hohmuth, Samuel: Integrated switched-mode power supplies with digital control enabling fast transient responses and parameter identification. Hannover : Gottfried Wilhelm Leibniz Universität, Diss. 2019, XI, 190 S. DOI: https://doi.org/10.15488/11165

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Integrated switched-mode power supplies benefit from innovative digital control loop designs and implementations, fast and goal-oriented parameter identifications, and from robust and fast transient controls of this work. A digital control loop comprises an ADC, a digital controller, and a digital pulse-width modulator / DAC. The ADC and the DPWM / DAC are required to operate with high sample rates, minimum conversion delay, monotonic transfer characteristics, and high resolution. The control loop components of this work extend the application range to SMPS with output voltages higher than 3.3V of prior publications. A presented delay line ADC (6 bit, 9.5 MSps, 90 ns latency, 1.2V dynamic operation range) enriches thestandard window concept with a live-tracking functionality, which is firstly proposed in this work. This functionality increases the resolution and enlarges the dynamic operation range. A charge pump DAC design offers 40x higher resolution compared to prior art. It guarantees monotonicity and low conversion time, enabling high-bandwidth digital control, along with low steady-state current consumption (20 μA). Large output voltages (>3.3 V) are supported with a high resolution in the order of 15 bits. A comparison of digital control to analog control demonstrates that digital control can be fully integrated. In contrast, this is not guaranteed for analog control and, if possible, chip area is significantly larger. Operating parameters in anSMPS may change significantly, together with its transfer behavior. SMPS passives face production tolerances, temperature dependencies, and aging. An adaption to varying operating conditions and actual values of the passives improves the SMPS behavior, ensures reliability, and saves cost. However, it requires an identification of the present operating conditions and parameters. A parameter identification concept yields results within less than 85 μs in startup and 2 μs in operation, which is 12x and 7000x shorter than prior art. It concentrates on and accurately identifies the most influential parameters of the SMPS, the inductor and the capacitor. A lossless load current identification runs without interruption of ongoing operation with only3% maximum identification inaccuracy. A controller adapts to a right half plane zero, that limits the converters’control bandwidths. With the proposed adaption, maximum bandwidth is achieved. Output voltage deviations are reduced by a factor of 2.4 and recovery times by a factor of 1.5 in case of load transients. For the first time, this work introduces a DV/Dt-intervention control concept, which is applicable, as add-on, to any standard controller. The voltage deviations are reduced by a factor of 2.8, which allows for downscaling the output capacitor by the same factor. The proposed innovative digital control loop designs, fast and goal-oriented parameter identifications, and robust fast transient controls, meet the needs of small cost, highreliability and flexibility in electronics, that are driven by a rising number of functionalities and features.
License of this version: CC BY-NC 3.0 DE
Document Type: doctoralThesis
Publishing status: publishedVersion
Issue Date: 2019
Appears in Collections:Fakultät für Elektrotechnik und Informatik
Dissertationen

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pos. country downloads
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1 image of flag of Germany Germany 85 34.69%
2 image of flag of United States United States 48 19.59%
3 image of flag of No geo information available No geo information available 12 4.90%
4 image of flag of China China 12 4.90%
5 image of flag of Russian Federation Russian Federation 11 4.49%
6 image of flag of France France 9 3.67%
7 image of flag of Czech Republic Czech Republic 7 2.86%
8 image of flag of Vietnam Vietnam 6 2.45%
9 image of flag of India India 6 2.45%
10 image of flag of Iran, Islamic Republic of Iran, Islamic Republic of 5 2.04%
    other countries 44 17.96%

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