Patent ID: 8749185

Claim:
A ventilation apparatus with a two-section feedback compensation control; the ventilation apparatus comprising: a power conversion unit receiving an AC power voltage and converting the AC power voltage into a DC power voltage; a driven circuit electrically connected to the power conversion unit to receive the DC power voltage and output a driven voltage; a DC motor electrically connected to the driven circuit and driven by the driven voltage outputted from the driven circuit; a current-sensing unit electrically connected to the DC motor and the driven circuit to sense an output current outputted from the DC motor; a voltage compensation unit electrically connected to the power conversion unit; and a control unit electrically connected to the current-sensing unit, the driven circuit, and the voltage compensation unit to receive the output current and produce a threshold current value comparing to the output current; wherein the control unit is configured to produce a DC control signal to control the voltage compensation unit regulating the DC power voltage, thus adjusting speed of the DC motor through the driven circuit when the output current is smaller than the threshold current value.