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A power path management circuit

A technology for managing circuits and power paths, applied in the direction of circuit devices, emergency power arrangements, electrical components, etc., can solve the problems of occupying control device pins, multi-input power switching circuits cannot realize automatic switching, and switching is unreliable, etc., to achieve reliable High performance, saving battery power, prolonging the effect of working time

Active Publication Date: 2016-10-05
QINGDAO GOERTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem that the existing multi-input power supply switching circuit cannot realize automatic switching and other path management, or the switching needs to occupy the pins of the control device, and the switching is unreliable, a power supply path management circuit is proposed, which can solve the above problems

Method used

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Embodiment 1

[0026] Embodiment 1, this embodiment proposes a power path management circuit, such as figure 1 As shown, the power path management circuit at least includes a first power switch circuit connected between the first power supply V1 and the system power output terminal POWER_OUT, and a second power supply connected between the second power supply V2 and the system power output terminal POWER_OUT A switch circuit, one of the output terminals 2 of the second power switch circuit is connected to the control terminal 3 of the first power switch circuit, and the other is connected to the system power output terminal POWER_OUT, the power path management circuit of this embodiment It also includes a second power supply overvoltage detection circuit, the input terminal 1 of the second power supply overvoltage detection circuit is connected to the second power supply V2, and the output terminal 2 of the second power supply overvoltage detection circuit is connected to the second power sup...

Embodiment 2

[0028] Embodiment 2. This embodiment provides an optimal circuit structure for implementing the power path management circuit in Embodiment 1. In this embodiment, as image 3 As shown, the first switch circuit includes a third PMOS transistor Q3, the drain of the third PMOS transistor Q3 is connected to the first power supply VCC_BAT (that is, the first power supply V1), and the source is connected to the system power supply output terminal POWER_OUT, One of the gates is grounded through the fifth resistor R5, and the other is connected to the output terminal of the second power switch circuit, wherein the first power supply VCC_BAT is a lithium battery. The working principle of the circuit in this embodiment is: the first switch circuit accepts the control of the second power switch circuit, when the second power supply EXT_PWR (that is, the first power supply V2) supplies power, the second power switch circuit supplies power to the gate of the third PMOS transistor Q3 The po...

Embodiment 3

[0035] Embodiment 3, this embodiment provides an optimal power management circuit including three power sources, wherein, the relevant circuits of the first power source and the second power source can be referred to in Embodiment 2, and will not be repeated here. In this embodiment, the relevant circuits of the third power supply and the working principle of the power management circuit of the entire three power supplies are introduced in detail. In this embodiment, as image 3 As shown, the third power switch circuit includes a second NMOS transistor Q2 and a first PMOS transistor Q1. One of the gates of the second NMOS transistor Q2 is connected to the ground terminal through the third resistor R3, and the other is connected to the first resistor R1 through the first resistor R1. The three power supplies are connected to VBUS, the source of the second NMOS transistor Q2 is connected to the ground terminal through the twelfth resistor R12, one drain of the second NMOS transis...

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PUM

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Abstract

The invention discloses a power source path management circuit which at least comprises a first power source switching circuit and a second power source switching circuit. The first power source switching circuit is connected between a first power source and the output end of a system power source. The second power source switching circuit is connected between a second power source and the output end of the system power source. One path of the output end of the second power source switching circuit is connected with the control end of the first power source switching circuit, and the other path is connected with the output end of the system power source. The power source path management circuit further comprises a second power source overvoltage detecting circuit. The input end of the second power source overvoltage detecting circuit is connected with the second power source. The output end of the second power source overvoltage detecting circuit is connected with the control end of the second power source switching circuit. According to the power source path management circuit, an independent electronic device is adopted for setting up the circuit, path management can be carried out on the first power source and the second power source according to a certain priority, and potential safety hazards are eliminated through overvoltage detection.

Description

technical field [0001] The invention relates to a power circuit, in particular to a power path management circuit. Background technique [0002] When electronic equipment is working, in order to achieve a long working time or to be applicable to various working environments, usually the power supply part of electronic equipment is not only designed to be able to use the built-in lithium battery in the electronic equipment, but also through the external USB ports, or special external adapters, etc. to supply power, so that there will be at least three power sources that can supply power, and the three power sources have a certain level of power supply priority. When two or more power sources are connected at the same time, there will be power supplies switching problem. [0003] For the switching of the three-way input power supply, a switch socket is often used. A mechanical contact switch is set at the interface of the equipment connected to the external battery. When the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J9/06
Inventor 林大鹏
Owner QINGDAO GOERTEK