CN-121983933-A - Multi-power supply switching circuit, electronic device and multi-power supply switching method

CN121983933ACN 121983933 ACN121983933 ACN 121983933ACN-121983933-A

Abstract

The present disclosure provides a multi-power supply switching circuit, which judges the priority order of power supplies corresponding to power supply loops through a plurality of different power supply loops, when a plurality of power supplies are input simultaneously, judges the priority order of the power supplies through a power supply control circuit arranged in the corresponding power supply loop, and controls the power supply switching circuit in the corresponding power supply loop to be turned on or off, and when the circuit is turned on, the power supplies corresponding to the power supply loops are transmitted to a power supply output end.

Inventors

QIU SHIRONG
LIN ZIZHENG

Assignees

环鸿电子（昆山）有限公司

Dates

Publication Date: 20260505
Application Date: 20260206

Claims (10)

1. A multiple power supply switching circuit, comprising: the first power supply switching circuit receives a first power supply and outputs the first power supply through a power supply output end; the first power supply control circuit controls the first power supply switching circuit to output the first power supply from the power supply output end; A second power supply switching circuit for receiving a second power supply and outputting the second power supply via the power supply output terminal, and A second power supply control circuit for controlling the second power supply switching circuit according to the first power supply and the second power supply; when the second power supply control circuit receives the first power supply, the second power supply control circuit controls the second power supply switching circuit to stop outputting the second power supply to the power supply output end; When the second power supply control circuit receives the second power supply and does not receive the first power supply, the second power supply control circuit controls the second power supply switching circuit to output the second power supply to the power supply output end.
2. The multi-power switching circuit of claim 1, wherein the second power control circuit comprises: A first control circuit for receiving the first power supply and outputting a cut-off signal; A second control circuit for receiving the second power supply and outputting a conducting signal to the second power supply switching circuit, wherein the second power supply switching circuit outputs the second power supply to the power supply output end according to the conducting signal; when the first control circuit obtains the first power supply, the cut-off signal is output to the second control circuit, and the second control circuit stops outputting the conduction signal to the second power supply switching circuit according to the cut-off signal, so that the second power supply switching circuit stops outputting the second power supply to the power supply output end.
3. The multi-power switching circuit of claim 1, further comprising: A third power supply switching circuit for receiving a third power supply and outputting the third power supply through the power supply output end; A third power supply control circuit for controlling the third power supply switching circuit according to the first power supply, the second power supply and the third power supply; when the third power supply control circuit receives the first power supply or the second power supply, the third power supply control circuit controls the third power supply switching circuit to stop outputting the third power supply to the power supply output end; When the third power supply control circuit receives the third power supply and does not receive the first power supply and the second power supply, the third power supply control circuit controls the third power supply switching circuit to output the third power supply to the power supply output end.
4. The multi-power switching circuit of claim 3 wherein the third power control circuit comprises: A first control circuit for receiving the first power supply and outputting a cut-off signal; A second control circuit for receiving the second power supply and outputting the cut-off signal; a third control circuit for receiving the third power supply and outputting a conducting signal to the third power supply switching circuit, wherein the third power supply switching circuit outputs the third power supply to the power supply output end according to the conducting signal; when the first control circuit obtains the first power supply or the second control circuit obtains the second power supply, the cut-off signal is output to the third control circuit, and the third control circuit stops outputting the on signal to the third power supply switching circuit according to the cut-off signal, so that the third power supply switching circuit stops outputting the third power supply to the power supply output end.
5. An electronic device, comprising: a multi-power switching circuit having the power supply of claim 1; A power management circuit for receiving an output power provided by the multi-power switching circuit at the power output end and controlling the output power to charge a battery and provide a system power required by the operation of the electronic device, and The control circuit is started to operate according to the system power supply and controls the multi-power supply switching circuit; wherein the output power supply is one of the first power supply and the second power supply.
6. The electronic device of claim 5, further comprising: A first reading circuit for detecting the first power supply; A second reading circuit for detecting the second power supply; the control circuit obtains the input states of the first power supply and the second power supply according to the detection results of the first reading circuit and the second reading circuit.
7. The electronic device of claim 6, further comprising: the first power supply control circuit controls the first power supply switching circuit to stop outputting the first power supply to the power supply output end according to the first trigger signal; the second trigger circuit provides a second trigger signal for the second power supply control circuit, and the second power supply control circuit controls the second power supply switching circuit to stop outputting the second power supply to the power supply output end according to the second trigger signal; The control circuit controls the first trigger circuit to generate the first trigger signal or controls the second trigger circuit to generate the second trigger signal according to a power setting command.
8. A multiple power supply switching method, comprising: when a first power supply switching circuit receives a first power supply, a first power supply control circuit controls the first power supply switching circuit to output the first power supply to a power supply output end; when a second power supply switching circuit receives a second power supply and the first power supply switching circuit does not receive the first power supply, a second power supply control circuit controls the second power supply switching circuit to output the second power supply to the power supply output end When the second power supply switching circuit receives the second power supply and the first power supply switching circuit receives the first power supply, the second power supply control circuit controls the second power supply switching circuit to stop outputting the second power supply to the power supply output end.
9. The multi-power switching method of claim 8, further comprising: When a third power supply switching circuit receives a third power supply and the first power supply switching circuit does not receive the first power supply and the second power supply switching circuit does not receive the second power supply, a third power supply control circuit controls the third power supply switching circuit to output the second power supply to the power supply output end When the third power supply switching circuit receives the first power supply or the second power supply, the third power supply control circuit controls the third power supply switching circuit to stop outputting the third power supply to the power supply output end.
10. The multi-power switching method of claim 8, further comprising: when a power management circuit of an electronic device obtains an output power through the power output end, the power management circuit charges a battery according to the output power and provides a system power for the electronic device; when the battery does not meet a starting voltage, the power management circuit stops outputting the system power supply, and when the battery meets the starting voltage, the power management circuit outputs the system power supply to the electronic device for starting; a control circuit of the electronic device detects the input states of the first power supply and the second power supply through a detection circuit; The control circuit generates a first trigger signal to a first power control circuit or a second trigger signal to a second power control circuit according to a power setting command; the first power supply control circuit controls the first power supply switching circuit to stop outputting the first power supply to the power supply output end according to the first trigger signal, and the second power supply control circuit controls the second power supply switching circuit to stop outputting the second power supply to the power supply output end according to the second trigger signal.

Description

Multi-power supply switching circuit, electronic device and multi-power supply switching method Technical Field The present invention relates to a power switching circuit, an electronic device, and a power switching method, and more particularly, to a multi-power switching circuit, an electronic device, and a multi-power switching method capable of simultaneously connecting a plurality of input power sources. Background In the prior art, with the USB power scheme, only the power specification originally supporting transmission can be used for transmission of a single USB transmission end, and no other power specification not belonging to the original supporting transmission can be supported. Therefore, when other power specifications not originally supporting transmission are required, the power specification used by the newly added power transmission terminal can only be expanded by adding other power transmission terminals, and the power specification used by the newly added power transmission terminal cannot be compatible with the originally used power management circuit. Disclosure of Invention The invention aims to solve the technical problem of providing a multi-power supply switching circuit, an electronic device and a multi-power supply switching method aiming at the defects of the prior art. One technical scheme adopted by the embodiment of the invention is that the multi-power supply switching circuit comprises a first power supply switching circuit, a first power supply control circuit and a second power supply control circuit, wherein the first power supply switching circuit receives a first power supply and outputs the first power supply through a power supply output end, the first power supply control circuit controls the first power supply switching circuit to output the first power supply through the power supply output end when receiving the first power supply, the second power supply switching circuit receives a second power supply and outputs the second power supply through the power supply output end, and the second power supply control circuit controls the second power supply switching circuit according to the first power supply and the second power supply. When the second power supply control circuit receives the first power supply, the second power supply control circuit controls the second power supply switching circuit to stop outputting the second power supply to the power supply output end. When the second power supply control circuit receives the second power supply and does not receive the first power supply, the second power supply control circuit controls the second power supply switching circuit to output the second power supply to the power supply output end. The technical scheme adopted by the embodiment of the invention is that the electronic device comprises a multi-power supply switching circuit, a power supply management circuit, a control circuit and a multi-power supply switching circuit, wherein the power supply management circuit receives an output power supply provided by the multi-power supply switching circuit at a power supply output end, controls the output power supply to charge a battery and provides a system power supply required by the operation of the electronic device, and the control circuit starts the operation according to the system power supply and controls the multi-power supply switching circuit. Wherein the output power supply is one of the first power supply and the second power supply. One of the technical schemes adopted in the embodiment of the invention is to provide a multi-power switching method, which comprises the steps that when a first power supply is received by a first power supply switching circuit, the first power supply switching circuit is controlled by a first power supply control circuit to output the first power supply to a power supply output end, when a second power supply is received by a second power supply switching circuit and the first power supply is not received by the first power supply switching circuit, the second power supply switching circuit is controlled by the second power supply control circuit to output the second power supply to the power supply output end, and when the first power supply is received by the first power supply switching circuit, the second power supply switching circuit is controlled by the second power supply control circuit to stop outputting the second power supply to the power supply output end. In summary, the multi-power switching circuit, the electronic device and the multi-power switching method provided by the embodiments of the invention realize the automatic switching of multi-power input through hardware without depending on software control. For a further understanding of the nature and the technical aspects of the present invention, reference should be made to the following detailed description of the invention and the accompanying drawings, which are provided for purposes of re