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Switching circuit of battery power supply, USB power supply and DC power supply

A DC power supply and switching circuit technology, applied in circuit devices, emergency power supply arrangements, electrical components, etc., can solve the problems of limited battery power, cost waste, and inapplicability to various equipment, so as to reduce equipment costs and save capital expenditures Effect

Inactive Publication Date: 2012-12-26
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This power supply method requires the device to have a USB interface, and the location is relatively fixed, so it is inconvenient to move. At the same time, the use of USB power supply will increase the power consumption of the computer.
[0005] Battery power supply is to supply power to the device through the battery carried by the device itself, which can be moved and is generally not limited by the location and environment. However, due to the limited battery power in this power supply method, the device cannot be operated when the battery power is exhausted.
[0006] When an electronic device is powered by battery, USB, and DC power supply, the power supply mode is usually switched according to the priority level of DC power supply, USB power supply, and battery power supply. At present, one implementation method is to complete the switching through the chip. However, since the mode provided by the chip is fixed and there are related current limitations, it cannot be applied to various devices, and the chip has a power conversion function. If it does not meet the requirements of the current device, it will be idle, resulting in waste of cost.

Method used

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  • Switching circuit of battery power supply, USB power supply and DC power supply
  • Switching circuit of battery power supply, USB power supply and DC power supply

Examples

Experimental program
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Effect test

Embodiment 1

[0039] refer to figure 1 , which shows a schematic structural diagram of a switching circuit powered by a battery, USB and DC power supply according to the present invention, the circuit comprising:

[0040] Battery power interface A for external battery;

[0041] USB power supply interface B for external USB power supply device;

[0042] DC power supply interface C for external DC power supply;

[0043] Equipment power interface O;

[0044] The battery power supply branch H includes a first connection device H1 including a transistor; one end of the first connection device H1 is connected to the battery power supply interface A, and the other end is connected to the equipment power supply interface O;

[0045] The USB power supply branch I includes a second connection device I1 including a transistor; one end of the second connection device I1 is connected to the USB power supply interface B, and the other end is connected to the device power supply interface O;

[0046] ...

Embodiment 2

[0056] Embodiment 2, as a preferred embodiment, further introduces the present invention more vividly and concretely. Compared with Embodiment 1, Embodiment 2 has the following characteristics:

[0057] Preferably, the first connection device including a transistor is a second PMOS transistor Q2.

[0058] Preferably, the second connection device including transistors includes a first diode D1 and a first PMOS transistor Q1.

[0059] Preferably, the first power supply control branch includes a third diode D3 and a second PMOS transistor Q2.

[0060] Preferably, the third connection device is a second diode D2.

[0061] Preferably, the second power supply control branch includes a fourth diode D4 and a second PMOS transistor Q2.

[0062] Preferably, the third power supply control branch includes a first PMOS transistor Q1, the gate of which is connected to the DC power supply interface; when the DC power supply branch supplies power, by pulling the gate of the first PMOS trans...

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PUM

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Abstract

The invention provides a switching circuit of battery power supply, USB power supply and DC power supply, which can realize the switching of the battery power supply, the USB power supply and the DC power supply in equipment through a circuit constructed with electronic components and / or discrete devices, and achieve smooth selection without chips according to the power supply priority, thereby greatly reducing the equipment cost and saving the expense.

Description

technical field [0001] The invention relates to the technical field of power supply of electronic equipment, in particular to a switching circuit powered by a battery, a USB and a DC power supply. Background technique [0002] With the rapid development of electronic technology, various electronic devices composed of integrated circuits, transistors, electronic tubes and other electronic components, which use electronic technology (including) software to play a role, are becoming more and more popular. Generally speaking, most electronic devices rely on electric energy to operate, and there are many ways to power them in actual use, including battery power, USB power and DC power supply. [0003] Among them, the DC power supply is powered by municipal power supply facilities, and then the voltage is converted to meet the voltage requirements of the equipment. Except for special cases of power failure, it can always supply power and operate, and the current required by the eq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J9/06
Inventor 王陆冰房汝明
Owner WUXI ZGMICRO ELECTRONICS CO LTD