Apple Invents Power Management System with Solar Panel Option

　　On October 31, 2013, the US Patent & Trademark Office published a patent application from Apple that reveals a new power management system that will work with both a power adapter and seamlessly with a portable solar panel accessory for busy people on the go. Apple's engineers are thinking big with their on-site solar power now creating the energy equivalent to powering 17,600 homes a year. The experience that Apple's engineers are gaining with working with solar panels is filtering through to creating a power management system for future Macs and iDevices. Apple has already been granted seven solar power patents thus far and you could review most of them in our Green Technology Archives. Today's patent goes one step further than most by introducing us to a solar power panel accessory for mobile devices like a MacBook or iPhone that won't require a power converter. Apple's system may be closer to reality than first thought considering that Apple's senior power design engineer noted as the inventor of this system has been snatched by Samsung within the last year.
　　Apple Invents Portable Solar Panel Accessory for Recharging Devices on the Go
　　Apple's patent filing states that in the absence of the power adapter and/or mains electricity, the portable electronic device may be powered by the battery until the battery is fully discharged. Because the battery has a limited runtime, operation of the portable electronic device may generally be dependent on the availability of mains electricity. Hence, use of portable electronic devices may be facilitated by improving access to power sources for the portable electronic devices.
　　Apple's invention relates to providing a power management system that supplies power to components in an electronic device. The power management system includes a system microcontroller (SMC) and a charger. The electronic devices that will be able to take advantage of Apple's new solar panel include a MacBook, iPad, iPod touch and iPhone.
　　During operation, the power management system accepts power from at least one of a power adapter and a solar panel. Next, the power management system supplies the power to components in the electronic device without using a converter circuit between the solar panel and the power management system.
　　In some embodiments, using the power management system to supply the power to the components involves tracking a maximum power point of the solar panel.
　　In some embodiments, tracking the maximum power point of the solar panel involves measuring one or more output powers associated with at least one of the solar panel and the power management system, and adjusting an input voltage of the power management system based on the one or more output powers. For example, the input voltage may be adjusted based on the output power(s) using a perturb-and-observe technique and/or an incremental conductance technique.