Primary-Side Regulator with Self-Calibration Knee Voltage Detection (KVD) Technique for High Efficiency and Low Cost
|關鍵字:||初次側調整控制器;膝點電壓追蹤調整;Primary-Side Regulator;Self-Calibration Knee Voltage Detection|
Nowadays portable devices have been considered a necessity by a lot of people and have become an essential part of everyday life. With the rapid growth in the consumer electronics, rechargeable mobile battery bank has proved to be the most compatible and satisfactory solution for portable devices. Therefore, it will be an important task for us to create a fast and efficient battery charging method with safe delivery of energy to the battery. Since universal serial bus (USB) charging method is a common trend now, most of the portable devices are charged via alternating current (AC) supply combine with USB. Primary-side regulator (PSR) is a high efficiency and low cost solution for power applications. It is a high-input voltage isolated charger compatible with the AC supply. To stabilize and to smoothly transit between the constant voltage and the constant current modes, the constant voltage and constant current loops are connected in parallel in the proposed PSR charger. However, the prominent difference between the PSR and conventional regulators is that the PSR does not have direct feedback loop to obtain the output information. Hence, it is a major challenge to precisely detect knee voltage from the auxiliary winding and thus to accurately control the entire system. This thesis introduces the PSR with self-calibration knee voltage detection (KVD) technique, which it can perform self-calibration based on the detection period for error checking and correction. Moreover, the new detection method not only can precisely get the knee voltage without any external components, but also can have all control paths stabilized. The transition smoothly changes between the constant voltage and the constant current modes. Valley switching with a dynamic frequency switching is applied in the constant voltage mode in order to enhance its efficiency and performance.
|Appears in Collections:||Thesis|
Files in This Item: