Quote:
|
Originally Posted by scotty1024
I agree on all points but one: that spike is the inductor in the eink DC-DC convertor being charged.
|
I guess it depends on the power supply design. When I'm designing circuitry like this, I tend to go overboard on capacitors for the output of the power supply to reduce EMI and improve requlation, so it can take a LOT of current at startup to charge these. On the other hand, most DC-DC boost converters for applications like this where size and weight are an issue would use very high frequencies (>500 KHz) and extremely small inductors, so these might not store much energy.
Anyway, I presume Sony took some care to get high efficiency from the converter, so most of the load can be assumed to be unavoidable given the voltage requirements and capacitance of the eInk display. Hopefully the evolution of these displays will reduce the voltage and increase the contrast as well.
It also looks like the display uses less than 40% of the total for most updates, so this may already be at the point of diminishing returns, Less time spend running the CPU and reading the flash would seem more likel;y to pay dividends.