Abstract
This paper presents an off-line integrated full ballast to supply a 35W assembly of Power LEDs. The proposed solution integrates an input PFC stage (a flyback converter operating in DCM) and a DC-DC output converter (a buck converter) into a single switch power stage, operating with peak current control. As it will be shown, this control scheme maintains the current through the load constant, regardless of the instantaneous value of the DC link voltage. This issue allows the use of a small capacitor for the DC link, which enhances the overall system reliability. The complete ballast has full dimming capability, and all the analysis and design steps are presented, thus ensuring the fulfilling of the existing regulations. The novelty of the final solution comes from the simplicity and robustness of the control scheme in an integrated compact single-switch power stage. A final prototype of the ballast has been built and tested, and experimental results are shown in the last part of the paper. Finally, conclusions and future developments are shown.
Highlights
At present, significant efforts are being performed in the development of lighting electronic systems, as one of the major research fields related to energy savings and sustainable development
The proposed solution integrates an input Power Factor Correction (PFC) stage and a DC-DC output converter into a single switch power stage, operating with peak current control
The novelty of the final solution comes from the simplicity and robustness of the control scheme in an integrated compact single-switch power stage
Summary
Significant efforts are being performed in the development of lighting electronic systems, as one of the major research fields related to energy savings and sustainable development. The overall components count of such drivers is relatively high, due the number of stages This scheme implies the use of a low ripple voltage DC link after the input Power Factor Correction (PFC) stage, commonly provided by an electrolytic capacitor. The DC bus voltage ripple can be significantly high, so the electrolytic capacitor can be removed and substituted by a small capacitance device Provided that both power stages are single-switch topologies, the integration of the circuitry can be explored as an optimization strategy. The proposed solution allows the use of a simple and reliable control method, effective in a circuit that avoids the use of electrolytic capacitors [21,22] This simplicity and robustness, along with the compact scheme inherent to integrated power stages, provides a new feasible solution for power LEDs drivers. A final discussion on the extension of the design for universal AC input voltage is carried out in Section 8, while Section 9 comments on the conclusions and future developments of this work
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