A low-current, negative high-voltage is required to bias sensors in advanced driver assistance systems, ultrasonic transducers for sonar applications, and communications equipment. Flyback, Cuk, and inverting buck-boost converters are all possible solutions, but are penalized by bulky transformers (fly...
At high power levels, the flyback converter operates in Quasi-Resonant (QR) mode. At lower power levels, the controller switches to Frequency Reduction (FR) in Discontinuous Conduction Mode (DCM) operation. The peak current is limited to a minimum level. Valley switching is used in all ...
This paper presents an Optimized Sensorless Charge Balance (OSCB) controller based on a damped current model for flyback converter operating in Discontinuous Conduction Mode (DCM). By solving total differential equations of non-ideal transformer currents, the damped current model is derived with conside...
Here, a current feedback OCC scheme was investigated to control the DCM boost PFC rectifier. As an application example, the improved PFC rectifier was employed as a high brightness high power LED driver; however, it could also be used for other applications. In the paper, the improved ...
The bridgeless Cuk PFC converter, by reducing the number of semiconductors in the circuit, lowers conduction losses and finds widespread application in various fields. However, it is challenging for the converter to achieve both high PF and low intermediate capacitor voltage simultaneously during normal...