| 摘要 |
An automatic voltage switch and an implementation method thereof. The automatic voltage switch comprises: a voltage amplitude sampling circuit used for sampling an alternating current voltage amplitude and outputting a sampled voltage value; a voltage state sampling circuit used for sampling a alternating current voltage waveform and outputting a sampled waveform signal; a microprocessor (U1) used for determining whether an alternating current voltage at an alternating current input end is a first voltage or a second voltage according to the sampled voltage value, determining whether the voltage is in a stable state according to the sampled waveform signal, and sending a voltage-doubling rectification instruction when the alternating voltage is a first voltage and is in a stable state. The automatic voltage switch automatically determines whether a currently input alternating current voltage is a first voltage or a second voltage, and when it is detected that the input alternating current voltage is in a stable state, sends a voltage-doubling rectification instruction to control the direct current voltage. The automatic voltage switch has a simple circuit structure, low cost and low power consumption, and is safe and reliable.
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