Abstract: An isolated multiple-output power supply with a function of detecting the presence or absence of a load at an output port is disclosed. The power supply includes a first voltage source for providing a first voltage at a first node; a first diode having a cathode coupled to the first output port, and an anode coupled to the first node for receiving the first voltage; a second voltage source for providing a second voltage at a second node; a second diode having a cathode coupled to a second output port, and an anode coupled to the second node for receiving the second voltage; and a bridging circuit having two terminals respectively connected to the first and the second output ports. When the load is not present at the first output port, the bridging circuit pulls up an output voltage at the first output port to reverse bias the first diode.

Abstract: An unmanned aerial vehicle is provided and includes: an unmanned aerial vehicle body, including an airframe and an articles storing device; an arm, including at least two front arms symmetrically arranged with respect to a central axis of the airframe along a front-rear direction and at least two rear arms symmetrically arranged with respect to the central axis of the airframe; and a rotor-wing electric motor, including a front electric motor and a rear electric motor. A first end of the front arm is connected with a front end of the airframe, and a second end of the front arm is provided with the front electric motor to drive the unmanned aerial vehicle. A first end of the rear arm is connected with a rear end of the airframe, and a second end of the rear arm is provided with the rear electric motor to drive the unmanned aerial vehicle.

Abstract: An unmanned aerial vehicle is provided and includes: an unmanned aerial vehicle body, including an airframe and an articles storing device; an arm, including at least two front arms symmetrically arranged with respect to a central axis of the airframe along a front-rear direction and at least two rear arms symmetrically arranged with respect to the central axis of the airframe; and a rotor-wing electric motor, including a front electric motor and a rear electric motor. A first end of the front arm is connected with a front end of the airframe, and a second end of the front arm is provided with the front electric motor to drive the unmanned aerial vehicle. A first end of the rear arm is connected with a rear end of the airframe, and a second end of the rear arm is provided with the rear electric motor to drive the unmanned aerial vehicle.