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jerryjhou 下面的顾客评论里说
At `HI' setting (up to 1875 Watt), the converter simply uses an electronic switch to 'chop' the 220V sinusoidal input voltage into smaller segments, such that the average power delivered to output load is reduced. This is the same principle used by most incandescent lamp dimmers. It works reasonably well for simple HEATING appliances, such as travel irons or hair dryers. But if you try to power any electronic appliance that is rated for 110V-only at this setting, the high-voltage stress will likely cause the appliance to break down and burn out within seconds!
似乎说的是在大功率模式下这个转换器不是真的把220V转成110V