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The circuit presented is a solar photovoltaic PWM charger for charging USB-powered devices. It is intended as a portable and tidier substitute to the commonly assembled petrol generator powered multi-socket AC phone chargers displayed in market stalls in Nigeria. The unit consists of two DC-DC step-down buck converter circuits; the first employs a TL494 switchmode regulator to charge a 12 V/24 Ah battery in constant current, constant voltage mode, while the second is based around multiple MC34063 switchmode ICs, each configured as a 5 V buck converter to run USB devices such as iPads, iPods, MP3 players, Bluetooth devices as well as chargers for mobile phones.

A Solar Powered PWM Charger for Multiport USB Devices