TY  - CPAPER
U1  - Konferenzveröffentlichung
A1  - Ulrich, Burkhard
T1  - A digital dithering phase shift modulator for enhanced resolution
T2  - APEC : thirty-ninth annual IEEE applied power electronics conference and exposition, 25-29 February 2024, Long Beach, California, proceedings
N2  - 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.
KW  - dithering
KW  - modulation
KW  - digital control
KW  - dual active half-bridge (DAHB)
KW  - phase shift
Y1  - 2024
U6  - https://doi.org/10.1109/APEC48139.2024.10509524
DO  - https://doi.org/10.1109/APEC48139.2024.10509524
SP  - 2849
EP  - 2854
S1  - 6
PB  - IEEE
CY  - Piscataway
ER  -