Abstract
This paper presents a zeta/flyback hybrid converter with a PV array as its power source for an LED street light or digital signage application. When the PV array is used in a LED lighting system, it needs a battery charger and discharger. In order to increase the areas of application for different PV arrays, a zeta converter has been adopted as the battery charger. In addition, since a flyback converter has a simpler circuit, it is used as the battery discharger. Due to the leakage inductor of the transformer in the flyback converter, an active clamp circuit is used to recover the energy stored in leakage inductance. Zeta and flyback converters use switch integration techniques to form the proposed zeta/flyback hybrid converter. With this approach, the proposed system has less components, a lighter weight, a smaller size, and higher conversion efficiency. Finally, a prototype of the proposed hybrid converter with an output voltage of 12 V and output power of 50 W has been implemented to verify its feasibility. It is suitable for LED lighting system applications.
Highlights
Since the diode DM2 is still kept in the forwardly bias state before switch M2 is turned on, the switch M2 can be operated with zero-voltage switching (ZVS) at turn-on
Since the diode DM2 is still kept in the forwardly bias state before switch M2 is turned on, the switch M2 can be operated with zero-voltage switching (ZVS) at turn-on transition
Since the proposed hybrid converter uses the zeta converter as its battery charger, switch M1 is regarded as the main switch, while switch M2 is indicated as the auxiliary switch
Summary
Since the proposed system operating in the charging condition belongs to a low-power-level application, it can use a basic converter as its charging converter, such as buck, boost, buck–boost, cuk, zeta, and sepic converters [7–10]. The authors of [8] proposed a simple converter, such as buck, boost, etc., to implement the renewable energy application, while [9] used a buck–boost, dc–dc converter to increase voltage gain. Sustainability 2022, 14, 2924 converters can implement step‐down or step‐up voltage functions, their power processing capability is low. They are not suitable for a higher power level application (≥100 W) [11]. WhenDue a power processor uses cuk or wider input voltage range, and lower the flyback converter selected as the bat‐.
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