Digital Predictive Current-Mode Control for Asymmetrical Half-Bridge LED Constant-Current Driver

In this paper, we propose three advanced digital predictive current-mode control (DPCC) algorithms based on a simplified estimation method of duty cycle lost time for asymmetric half-bridge (AHB) LED constant-current driver. They are the peak current mode control(DPPCC) algorithm leading-edge modulation, quasi-valley control(DPqVCC) trailing-edge and quasi-average control(DPqACC) double-edge modulation. Simulation experimental results demonstrate that DPCC can effectively offset effect delay performance, which confirms superiority DPqACC. When DPqACC is applied, series-load-jump transition times below 4.5 ms, maximum load adjustment rate 0.5%/ V, output be tuned continuously between 0.3 A with longest 1 ms. Moreover, capable compensating low-frequency ripples due to rapid regulation speed inner loop. With electrolytic capacitance removed without additional ripple compensation, peak-to-peak value secondary 0.1163 (2.91%) when input 400 53sin(2ω lin t ) V 4 A. This approach provides an excellent solution design low-ripple AC-DC drivers capacitance.