This paper presents a charger and LED lighting (discharger) hybrid system with a PV array as its power source for electronic\nsign indicator applications. The charger adopts buck-boost converter which is operated in constant current mode to charge leadacid\nbattery and with the perturb and observe method to extract maximum power of PV arrays. Their control algorithms are\nimplemented by microcontroller.Moreover, forward converter with active clamp circuit is operated in voltage regulation condition\nto drive LED for electronic sign applications. To simplify the circuit structure of the proposed hybrid converter, switches of two\nconverters are integrated with the switch integration technique. With this approach, the proposed hybrid converter has several\nmerits, which are less component counts, lighter weight, smaller size, and higher conversion efficiency. Finally, a prototype of LED\ndriving system under output voltage of 10V and output power of 20W has been implemented to verify its feasibility. It is suitable\nfor the electronic sign indicator applications.
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