2026/05/14 by J. Chen, Junying Chen, Yongyuan Li +4
Engineering · #Advanced DC-DC Converters #Induction Heating and Inverter Technology #Microgrid Control and Optimization
paper · doi:10.1109/tpel.2026.3692993
openalex publication_date 2026/05/14 · openalex created_date 2026/05/15 · openalex updated_date 2026/07/30
Conventional adaptive on-time (AOT) regulators suffer from switching frequency shift caused by duty-cycle and load variations, as well as instability in different operating mode. Prior woks exhibit limited frequency stabilization capability, particularly across wide load and duty-cycle ranges, and concentrate on continuous conduction mode (CCM) stability compensation but overlook the discontinuous conduction mode (DCM) instability. Targeting on great frequency drift and instability across a wide range of load and duty cycle, an actual duty-cycle control (ADCC) scheme is proposed to achieve enhanced pseudo-constant frequency and system stability both in CCM and DCM. Besides, the ADCC scheme achieves a loop bandwidth of approximately one-third of the switching frequency with a compact implementation, as reflected by the improved FOM. A prototype converter was fabricated in a 180 nm BCD process and tested with low-ESR output capacitors. The measurement results confirm stable operation across the entire load and input range, with the frequency deviation as low as 1.74 kHz/A and 1.68 kHz/V. And the converter achieves a peak efficiency of 92.7% and a significantly improved FOM of 26.