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初看来,用5V USB端口为超级电容器充电似乎是简单的事,但是要将三只超级电容充电至7V,并将输入电流限制在USB端口的最大极限500mA内,就比较困难了。本设计实例中的电路采用一只Linear
At first glance, charging a supercapacitor with a 5V USB port seems a simple matter, but charging three supercapacitors to 7V and limiting the input current to a maximum of 500mA in a USB port is more difficult. The circuit in this design example uses a Linear