| http://www.w3.org/ns/prov#value | - DC, through the high-frequency PWM (pulse width modulation) switching power supply technology into 30kHz-50kHz, 220V AC or so; the role of the second part of the circuit is to use the bridge rectifier, filter, pulse-width modulation and switching power output and other technology, 30kHz ~ 50kHz, 220V convert alternating current of about 50Hz, 220V AC.
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