Network power supply device and operation method thereof

Abstract

This invention proposes a network power supply device, including a power supply circuit, a detection unit, a buck converter, a first switch, and a second switch. The buck converter reduces a first voltage provided by a voltage source to a second voltage before transmitting it to the detection unit. The first switch is electrically connected to the voltage source and the power supply circuit and is controlled by the detection unit. The second switch is electrically connected to the power supply circuit, the buck converter, and the detection unit and is controlled by the detection unit. When the power supply circuit is not activated, the detection unit detects that a powered device is electrically connected to the network power supply device and controls the first and second switches to turn on, thereby activating the power supply mechanism. When the power supply circuit is activated, the detection unit detects that the powered device has disconnected from the network power supply device and controls the first and second switches to turn off, thereby deactivating the power supply mechanism.

Claims

1. A network power supply device, comprising: A power supply circuit electrically connected to a ground terminal; a detection unit electrically connected to the power supply circuit; a buck converter electrically connected between a voltage source and the detection unit, configured to reduce a first voltage provided by the voltage source to a second voltage before transmitting it to the detection unit; a first switch, one end of which is electrically connected to the voltage source and the other end of which is electrically connected to the power supply circuit, the first on / off state being controlled by the detection unit; and a second switch, one end of which is electrically connected to the power supply circuit and the other end of which is electrically connected between the buck converter and the detection unit, the second on / off state being controlled by the detection unit; Specifically, when the power supply circuit is not activated, if the detection unit detects that a powered device is electrically connected to the network power supply device, the detection unit controls the first switch and the second switch to turn on to activate a power supply mechanism; if the power supply circuit is activated, if the detection unit detects that the powered device has disconnected from the network power supply device, the detection unit controls the first switch and the second switch to turn off to shut down the power supply mechanism.

2. The network power supply device as described in claim 1 also includes: The first node is electrically connected to the voltage source; The second node; A transistor switch is electrically connected between the ground terminal, the second node, and the power supply circuit. One gate terminal of the transistor switch is controlled by a gate drive voltage output by the power supply circuit.

3. The network power supply device as described in claim 2 also includes: A first resistor and a second resistor are connected in series between the second node and the ground terminal. The detection unit is electrically connected between the first resistor and the second resistor to detect a voltage detection signal, and the voltage detection signal is a voltage division of the second node voltage.

4. The network power supply device as claimed in claim 3, wherein when the power supply circuit is not started, the detection unit detects that the voltage detection signal has a first non-zero voltage pulse and determines that the powered device is electrically connected to the network power supply device, and the first non-zero voltage pulse comes from the powered device.

5. The network power supply device as claimed in claim 3, wherein when the power supply device circuit is activated, the detection unit detects that the voltage detection signal has a second non-zero voltage pulse and determines that the powered device has disconnected from the network power supply device, and the second non-zero voltage pulse originates from the powered device.

6. The network power supply device as claimed in claim 1, wherein when the detection unit detects that the powered device is electrically connected to the network power supply device, the detection unit sends a control signal having a first criterion to the first switch and the second switch to control the first switch and the second switch to be turned on.

7. The network power supply device as claimed in claim 1, wherein when the detection unit detects that the powered device has been disconnected from the network power supply device, the detection unit sends a control signal having a second level to the first switch and the second switch to control the first switch and the second switch to turn off.

8. As in claim 1, when the detection unit detects that the powered device is electrically connected to the power supply device, the power supply circuit will first communicate with the powered device for a period of time. After the communication is completed, the power supply circuit will control the first switch and the second switch to turn on in order to start the power supply mechanism and start supplying power to the powered device.

9. The network power supply device as claimed in claim 1, wherein when the power supply circuit supplies power to the powered device, the power supply circuit sends a power supply status signal with a first criterion to the detection unit, and when the power supply circuit stops supplying power to the powered device, the power supply circuit sends the power supply status signal with a second criterion to the detection unit.

10. The network power supply device as claimed in claim 9, wherein when the detection unit detects that the powered device has disconnected from the network power supply device, the detection unit will wait for a preset time before controlling the first switch and the second switch to turn off the power supply mechanism and stop the power supply.

11. The network power supply device as requested in item 1, wherein the detection unit is a microcontroller.

12. A method of operating a network power supply device, the network power supply device comprising a power supply circuit, a detection unit, a step-down converter, a first switch and a second switch, wherein the power supply circuit is electrically connected to the detection unit and a ground terminal, the step-down converter is electrically connected between a voltage source and the detection unit, one end of the first switch is electrically connected to the voltage source and the other end is electrically connected to the power supply circuit, and one end of the second switch is electrically connected to the power supply circuit and the other end is electrically connected between the step-down converter and the detection unit, the method of operation comprising: (a) The voltage provided by the voltage source is reduced to a second voltage by the buck converter and then transmitted to the detection unit; (b) When the power supply circuit is not started, the detection unit detects whether a powered device is electrically connected to the network power supply device; (c) If the detection result of step (b) is yes, the detection unit controls the first switch and the second switch to be turned on to start a power supply mechanism; (d) When the power supply circuit is started, the detection unit detects whether the powered device has been disconnected from the network power supply device; and (e) If the detection result of step (d) is yes, the detection unit controls the first switch and the second switch to be turned off to shut down the power supply mechanism.

13. The method of operation as claimed in claim 12, wherein the power supply device further includes a first resistor and a second resistor connected in series between a second node and the ground terminal, and the method of operation further includes: The detection unit detects a voltage detection signal between the first resistor and the second resistor, and the voltage detection signal is a voltage division of the second node voltage of the second node.

14. The method of operation as claimed in claim 13, wherein in step (b), when the power supply circuit is not started, the detection unit detects that the voltage detection signal has a first non-zero voltage pulse and determines that the powered device is electrically connected to the network power supply device, and the first non-zero voltage pulse comes from the powered device.

15. The method of operation as claimed in claim 13, wherein in step (d), when the power supply circuit is started, the detection unit detects that the voltage detection signal has a second non-zero voltage pulse and determines that the powered device has disconnected from the network power supply device, and the second non-zero voltage pulse is from the powered device.

16. The method of operation as claimed in claim 12, wherein in step (c), the detection unit sends a control signal having a first criterion to the first switch and the second switch to control the first switch and the second switch to be turned on.

17. The method of operation as claimed in claim 12, wherein in step (e), the detection unit sends a control signal having a second level to the first switch and the second switch to control the first switch and the second switch to turn off.

18. The operation method of claim 12, wherein when the detection unit controls the first switch and the second switch to be turned on, the power supply circuit will first communicate with the powered device for a period of time, and after the communication is completed, the power supply circuit will start the power supply mechanism to start supplying power to the powered device.

19. The method of operation as described in claim 12 also includes: When the power supply circuit supplies power to the powered device, the power supply circuit sends a power supply status signal with a first level to the detection unit; and when the power supply circuit stops supplying power to the powered device, the power supply circuit sends the power supply status signal with a second level to the detection unit, causing the detection unit to control the first switch and the second switch to turn off the power supply mechanism.

20. The method of operation as described in claim 19 also includes: When the detection unit receives the power supply status signal with the second level, the detection unit will wait for a preset time before controlling the first switch and the second switch to turn off the power supply mechanism.

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