A power device and a method for determining whether a load is present

Abstract

A power device and a method for determining whether a load is present are provided. The power device comprises an AC output terminal, a voltage sensor, a current sensor, and a control unit. The control unit is configured to acquire, respectively via the voltage sensor and current sensor, n instantaneous voltage values and n instantaneous current values at the AC output terminal during a first period, calculate a voltage RMS value, a current RMS value, an apparent power value, and a real power value based on these values, and calculate a power factor value based on the apparent power value and the real power value. The control unit is further configured to determine whether the power factor value is greater than a first threshold. If the determination is positive, the control unit concludes that a load is electrically coupled to the AC output terminal.

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