My goal is to make an efficient phone charger for long distance cycling. Last year I had a rough version of it which worked for the most part. I was wondering If I could make it better.
I tried to make it efficient by using buck converter and voltage doubler.
Have Over Voltage protection by using TVS diode and Thermal switch.
SMD components to minimize the footprint.
First problem I have is the Voltage doubler doesn't work. I must have understood it wrong. I've only tested the circuit on DC voltage, but the difference between input and output is ~ -1.5V.
Second is power delivery. I had power supply set up for up to 1A, but I couldn't get no higher than 0.5A. I might have messed up with resistor traces for iphone to detect the 1A current. Instead the iphone was only taking 0.1A. Android phone was taking 0.5A. Still not desired 1A.
Third is Buck converter. Even though I was only pulling 2.5W from MP2370 it got toasty(80C) From other reviews they could achieve 10W before going over 90C. Not sure if it is faulty buck converter or something else.
I would love to get some advice on the pcb design. Thank you very much in advance.
I tried to make it efficient by using buck converter and voltage doubler.
Have Over Voltage protection by using TVS diode and Thermal switch.
SMD components to minimize the footprint.
First problem I have is the Voltage doubler doesn't work. I must have understood it wrong. I've only tested the circuit on DC voltage, but the difference between input and output is ~ -1.5V.
Second is power delivery. I had power supply set up for up to 1A, but I couldn't get no higher than 0.5A. I might have messed up with resistor traces for iphone to detect the 1A current. Instead the iphone was only taking 0.1A. Android phone was taking 0.5A. Still not desired 1A.
Third is Buck converter. Even though I was only pulling 2.5W from MP2370 it got toasty(80C) From other reviews they could achieve 10W before going over 90C. Not sure if it is faulty buck converter or something else.
I would love to get some advice on the pcb design. Thank you very much in advance.
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