An alternating current (AC) rectifier can double the voltage for low-voltage AC sources, such as 110 volt AC sources, and maintain the voltage for high-voltage AC sources, such as 220 volt AC sources. The rectifier can therefore provide a consistent high direct current (DC) voltage, such as 220 volts, regardless of whether the rectifier is plugged into a source such as a wall outlet in the United States, where wall outlets typically provide 110 volts AC, or a wall outlet in Europe, where wall outlets typically provide 220 volts AC. The rectifier can be included in an integrated circuit of a power adapter that couples a computing device to the wall outlet. As a safety feature, the rectifier can include a fuse and a switch that short-circuits the rectifier when the rectifier is unable to avoid doubling the voltage in response to a high-voltage AC source, blowing the fuse to prevent a fire or explosion.

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