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Method and device for power source switching, and hand-held terminal

A power switching and terminal technology, applied in the field of power distribution, can solve the problem that the battery cannot be charged in time, and achieve the effect of smooth switching

Inactive Publication Date: 2016-04-27
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a power switching method and device, and a handheld terminal to solve the problem of automatically selecting the power supply circuit through diodes in the prior art. When the external power supply is normal, the external power supply cannot be preferably selected to save battery energy. The problem of not being able to get a timely charge

Method used

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  • Method and device for power source switching, and hand-held terminal
  • Method and device for power source switching, and hand-held terminal
  • Method and device for power source switching, and hand-held terminal

Examples

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Embodiment 1

[0051] In the following, we will introduce the preferred embodiment of the present invention by taking the dual triode as an example. Image 6 It is a schematic diagram of the preferred connection between the main power supply and the battery switching circuit according to the preferred embodiment of the present invention Figure 1 , combined with Image 6 The circuit principle of the preferred embodiment of the present invention is described.

[0052] Step 1: When there is a main power supply (adapter), the ADAPTER outputs POWER_IN through the diode VD2 to supply power to the subsequent load;

[0053] Step 2: ADAPTER divides the voltage through R3 and R5, so that the lower triode of VT1 is turned on and the upper triode is cut off. There is no voltage between G and S of VT2, VT2 is cut off, and the battery BAT+ cannot supply power to the subsequent load;

[0054] Step 3: ADAPTER charges the battery BAT+ through the body diodes of diodes VD2 and VT2;

[0055] Step 4: When t...

Embodiment 2

[0057] Figure 7 It is a schematic diagram of the preferred connection between the main power supply and the battery switching circuit according to the preferred embodiment of the present invention Figure II ,Such as Figure 7 As shown, the VT1 dual triode in Example 1 is changed to dual MOSFET. Since the working principle of the dual triode is similar to that of the dual MOSFET, details will not be repeated here.

[0058] Through the preferred embodiment of the present invention, simple discrete devices are used to realize the power supply of the main power supply to the load and the charging of the battery of the backup power supply. At the same time, when the main power supply is powered off, it can be smoothly switched to the battery power supply of the backup power supply, which solves the problem of related technologies. The diode automatically selects the power supply circuit. When the external power supply is normal, the external power supply cannot be preferably sel...

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PUM

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Abstract

The invention provides a method and a device for power source switching, and a hand-held terminal. The device comprises a main power source supply circuit, a standby power source supply circuit, a bidirectional switch circuit and a detection circuit, wherein the detection circuit is electrically connected between a main power source and the bidirectional switch circuit, the bidirectional switch circuit is connected between a standby power source and a lead, the detection circuit is used for detecting a work state of the main power source supply circuit and generating a first control signal when the work state is normal, the bidirectional switch circuit receives the first control signal and is triggered by the first control signal to conduct a first passage between the main power source supply circuit and the standby power source supply circuit and to close a second passage between the standby power source supply circuit and the load, the first passage is used for providing the passage for charging the standby power source supply circuit through the main power source supply circuit, and the second passage is used for providing the passage for providing power supply for the load through the standby power source supply circuit.

Description

technical field [0001] The present invention relates to the field of power distribution, in particular, to a power switching method and device, and a handheld terminal. Background technique [0002] Terminal devices in the prior art, especially handheld devices, have built-in rechargeable batteries. When the external power supply is abnormal or power-off, it needs to switch to the battery to supply power to the device. During the switching process, it should be realized The seamless and smooth power supply of the battery, and the realization of this function often requires a large number of detection devices and complex circuits, which is often impractical for terminal equipment with high cost requirements. figure 1 It is a structural schematic diagram of the power supply of the terminal equipment in the related art, such as figure 1 As shown, the power supply circuit is automatically selected through the conduction characteristics of the diode, so when the external power s...

Claims

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Application Information

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IPC IPC(8): H02J9/06H02J7/00
CPCH02J9/06Y02B70/30Y04S20/20
Inventor 易旭东谭建
Owner ZTE CORP