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A digital dithering phase shift modulator for enhanced resolution

  • This article proposes a digital dithering phase shift modulator to control power electronic converters. The presented modulator allows a higher resolution for digitally generated phase-shift signals without the need for fine time steps using very high-frequency or high-resolution timers. To achieve this, two coarse, counter-based phase-shift signals that differ in their phase shift values by one bit are used, and a total phase-shift output signal is derived by periodically switching between these two. The result is a dithered phase-shift control signal with an increased switching frequency or resolution. A prototype circuit for the control signal generation for a dual-active half-bridge converter is presented. Using only a 48 MHz digital clock signal, a control signal with a switching frequency of 188 kHz and a resolution of 12 bits is achieved. The modulation concept is described, and its application is verified using simulations and experimental tests.

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Author of HS ReutlingenUlrich, Burkhard
Erschienen in:APEC : thirty-ninth annual IEEE applied power electronics conference and exposition, 25-29 February 2024, Long Beach, California, proceedings
Place of publication:Piscataway
Document Type:Conference proceeding
Publication year:2024
Tag:digital control; dithering; dual active half-bridge (DAHB); modulation; phase shift
Page Number:6
First Page:2849
Last Page:2854
DDC classes:600 Technik
Open access?:Nein
Licence (German):License Logo  In Copyright - Urheberrechtlich geschützt