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Mobile terminal charging device, system and method

A technology for mobile terminals and charging devices, which is applied to circuit devices, battery circuit devices, current collectors, etc., can solve the problems of touch screen interference, non-responsive touch screen, and jumping points of mobile terminals.

Inactive Publication Date: 2013-03-27
XIAOMI INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, since the primary unit 210 of the switching power supply is a switching power supply, the switching frequency is relatively high, and a common mode noise signal will be generated, and the common mode noise signal will be transmitted to the secondary unit 230 of the switching power supply through the parasitic capacitance, and the secondary unit 230 of the switching power supply It is directly connected to the mobile device, so the common mode noise signal will also be transmitted to the mobile device
[0005] Smart mobile terminals are generally equipped with touch screens, and the touch signal circuit of the capacitive touch screen is actually referenced to the ground. In this way, the common mode noise signal can flow back to the ground through the touch screen signal circuit, so that the circuit of the common mode noise signal is consistent with the touch signal. The loops are the same, which interferes with the touch signal
When the common-mode noise signal introduced by the charger is large, it will cause the touch screen to not respond or appear to jump.
[0006] It can be seen that the current charging device of the mobile terminal will introduce common mode noise signals into the mobile terminal during the charging process, which will interfere with the touch screen of the mobile terminal

Method used

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  • Mobile terminal charging device, system and method
  • Mobile terminal charging device, system and method
  • Mobile terminal charging device, system and method

Examples

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Embodiment 1

[0040] Embodiment 1, in the embodiment of the present invention, the mobile terminal charging device such as figure 2 As shown, it includes: switching power supply primary unit 210, transformer 220, and switching power supply secondary unit 230; wherein,

[0041] The switching power supply primary unit 210 is connected to the switching power supply secondary unit 230 through the transformer 220; and the reference potential terminal of the switching power supply secondary unit 230 is grounded.

[0042] In this way, after the alternating current signal is input to the charging device from the primary unit 210 of the switching power supply, after passing through the primary unit 210 of the switching power supply, the transformer 220, and the secondary unit 230 of the switching power supply, it is converted into a DC signal and output from the secondary unit 230 of the switching power supply .

[0043] Such as figure 2 As shown, since the reference potential terminal (-) of th...

Embodiment 2

[0046] Embodiment 2, using the above-mentioned charging device to charge the mobile terminal can constitute a mobile terminal charging system, such as image 3As shown, it includes: an AC power source 100 , a charging device 200 , and a mobile terminal 300 . Wherein, the specific structure of the charging device 200 may be as shown in the embodiment, including: a switching power supply primary unit 210 , a transformer 220 , and a switching power supply secondary unit 230 .

[0047] In this way, the charging device 200 is connected to the AC power supply AC100 and the mobile terminal 300 respectively, and converts the AC power signal into a DC signal and outputs the AC power signal to the mobile terminal 300, and converts the AC power signal generated during the conversion process to the mobile terminal 300. The common mode noise signal flows to the ground through the reference potential terminal of the switching power supply secondary unit 230 in the charging device 200 .

[...

Embodiment 3

[0053] Embodiment 3. Since there are many ways to ground the reference potential end of the switching power supply secondary unit 230, in this embodiment, the mobile terminal charging device also includes: a three-pin socket, the ground wire of the three-pin socket and the switching power supply secondary The reference potential end of the unit is connected, therefore, the charging system in this embodiment is as Figure 6 As shown, it includes: an AC power source 100 , a charging device 200 , and a mobile terminal 300 . Wherein, the charging device 200 includes: a three-pin socket head 240 , a switching power supply primary unit 210 , a transformer 220 , and a switching power supply secondary unit 230 .

[0054] The live wire and the neutral wire of the three-pin socket head 240 are respectively connected to the primary unit 210 of the switching power supply, and the ground wire of the three-pin socket head 240 is connected to the reference potential terminal (-) of the secon...

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Abstract

The invention discloses a mobile terminal charging device, system and method which are used for reducing common-mode noise signals brought into a mobile terminal during charging of the charging device. The mobile terminal charging device comprises a switch power source primary unit, a transformer and a switch power source secondary unit, wherein the switch power source primary unit is connected with the switch power source secondary unit through the transformer, and a reference potential end of the switch power source secondary unit is connected with the ground.

Description

technical field [0001] The invention relates to the technical field of electronic products, in particular to a mobile terminal charging device, system and method. Background technique [0002] At present, the mobile terminal can work for a long time with the support of the electric energy stored in the battery, and the battery can obtain electric energy for storage by connecting the charging device with the daily AC power supply without being separated from the mobile terminal. [0003] see figure 1 , the mobile phone charger system includes: an AC power supply 100, a charger 200 and a mobile phone device 300, wherein the switching power supply primary unit 210 in the charger 200 is connected to the AC power supply 100 to obtain 220V alternating current, and through the transformer 220 and the switching power supply secondary The secondary unit 220 is connected to each other, so that the output electrical signal is converted into 5V alternating current through the transform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/02H01M10/42
CPCY02E60/12Y02E60/10
Inventor 孙伟郭峰李晖
Owner XIAOMI INC