CN203301179U - Anti-interference charger applied to capacitor touch screen - Google Patents
Anti-interference charger applied to capacitor touch screen Download PDFInfo
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- CN203301179U CN203301179U CN2013202546069U CN201320254606U CN203301179U CN 203301179 U CN203301179 U CN 203301179U CN 2013202546069 U CN2013202546069 U CN 2013202546069U CN 201320254606 U CN201320254606 U CN 201320254606U CN 203301179 U CN203301179 U CN 203301179U
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- touch screen
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Abstract
The utility model discloses an anti-interference charger applied to a capacitor touch screen. The charger comprises a charger body and a common mode inductor L1. Two input ends of the common mode inductor L1 are respectively connected with a live line L and a zero line N of a power grid. The output end is connected with the input end of the charger body. Two input ends of the common mode inductor are respectively connected with a ground line PE of the power grid through a capacitor C1 and a capacitor C2. According to the utility model, through the common mode inductor, common mode interference can be effectively suppressed; through a Y capacitor, an interference signal is discharged; and the conditions that jump points emerge and operation cannot be carried out are avoided when the touch screen is used in a charging process.
Description
Technical field
The utility model relates to a kind of charger, relates in particular to a kind of charger of anti-interference for capacitance touch screen.
Background technology
Development along with touch screen technology; capacitive touch screen is widely used in the portable sets such as mobile phone, panel computer; these portable equipments need often charging because battery capacity is limited, and the charging interval is usually more than 1 hour, so the user often can use capacitance touch screen in charging.In fact, capacitive touch screen is a capacitance measurement system in essence, wherein, capacitance measurement is mainly to measure in the mode of transmitted signal-reception signal, so, common-mode noise on charger, probably be transferred to the input of touch-screen and signal caused to interference when the user uses touch-screen, the phenomenon of capacitance touch screen detection chip error detection or erroneous judgement easily occurs.
At present, the charging device of portable set adopts switching type charger mostly, in this charger, because its input is directly introduced line voltage, and line voltage easily produces common mode disturbances in charger body, so the problem such as this charger ubiquity switch spectrum leakage, common mode disturbances are serious, cause portable set hop under above-mentioned charging environment, easily to occur, the series of problems such as can't operate.
The utility model content
The technical problems to be solved in the utility model is, for the deficiencies in the prior art, a kind of charger of anti-interference for capacitance touch screen is provided, this charger is provided with common mode inductance and Y electric capacity at its front end, and can effectively suppress common mode disturbances by this common mode inductance, and by Y electric capacity, interference signal is released, thereby avoided in charging process using touch-screen and the situation that hop maybe can't operate occurs.
For solving the problems of the technologies described above, the utility model adopts following technical scheme.
A kind of charger of anti-interference for capacitance touch screen, described charger includes a charger body and a common mode inductance L 1, two inputs of described common mode inductance L1 are connected to live wire L and the zero line N of electrical network, its output is connected with the input of charger body, and two inputs of this common mode inductance are connected in respectively the ground wire PE of electrical network by capacitor C 1 and capacitor C 2.
Preferably, the earth terminal GND of the DC output end of described charger body is connected in the ground wire PE of electrical network by capacitor C 3.
Preferably, described charger body includes a transformer, between the armature winding of described transformer and secondary winding, is provided with the copper shield film, and described copper shield film is connected with the ground wire PE of electrical network.
The disclosed charger of anti-interference for capacitance touch screen of the utility model, when in the normalized current of electrical network, having the common mode disturbances electric current, this common mode disturbances electric current can make two inductance coils produce magnetic field in the same way and increase the induction reactance of coil, at this moment, inductance coil is high impedance status, and have stronger damping, thereby decay or suppressed this common mode disturbances electric current.Simultaneously, because two inputs of common mode inductance are connected in respectively the ground wire PE of electrical network by capacitor C 1 and capacitor C 2, this capacitor C 1 and capacitor C 2 have formed the circuit structure of Y electric capacity, make interference signal can access effectively and release by capacitor C 1 and capacitor C 2.The utility model compared to existing technologies, can effectively suppress common mode disturbances by this common mode inductance, and by Y electric capacity, interference signal is released, thereby has avoided in charging process using touch-screen and the situation that hop maybe can't operate occurs.
The accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of the charger that the utility model proposes.
Fig. 2 is the internal structure schematic diagram of transformer.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in more detail.
The utility model discloses a kind of charger of anti-interference for capacitance touch screen, as shown in Figure 1, described charger includes a charger body 1 and a common mode inductance L 1, two inputs of described common mode inductance L1 are connected to live wire L and the zero line N of electrical network, its output is connected with the input of charger body 1, and two inputs of this common mode inductance 1 are connected in respectively the ground wire PE of electrical network by capacitor C 1 and capacitor C 2.
Wherein, common mode inductance L1 includes two inductance coils, two inductance coils all are wound on same iron core, and the number of turn of the two and phase place are all identical, when the normalized current of electrical network flows through common mode inductance L1, electric current produces reverse magnetic field and cancels out each other in the inductance coil of same-phase coiling, make normalized current by common mode inductance L1, to transfer to charger body 1 smoothly.When in the normalized current of electrical network, having the common mode disturbances electric current, this common mode disturbances electric current can make two inductance coils produce magnetic field in the same way and increase the induction reactance of coil, at this moment, inductance coil is high impedance status, and have stronger damping, thereby decay or suppressed this common mode disturbances electric current.Simultaneously, because two inputs of common mode inductance 1 are connected in respectively the ground wire PE of electrical network by capacitor C 1 and capacitor C 2, this capacitor C 1 and capacitor C 2 have formed the circuit structure of Y electric capacity, make interference signal can access effectively and release by capacitor C 1 and capacitor C 2.In the charger that the utility model proposes, by this common mode inductance, can effectively suppress common mode disturbances, and by Y electric capacity, interference signal be released, thereby avoid in charging process using touch-screen and the situation that hop maybe can't operate occurs.
On the basis of foregoing circuit structure, the earth terminal GND of the DC output end of described charger body 1 is connected in the ground wire PE of electrical network by capacitor C 3, wherein, capacitor C 3, capacitor C 1 and capacitor C 2 are all as Y electric capacity and be used to releasing interference signal, in practical application, can the amount of capacity of Y electric capacity be set according to the charging demand of portable set, in the present embodiment, the I of the capacity of above-mentioned three Y electric capacity reaches 1000pF.
In conjunction with Figure 1 and Figure 2, described charger body 1 includes a transformer 2, between the armature winding of described transformer 2 and secondary winding, be provided with copper shield film 3, described copper shield film 3 is connected with the ground wire PE of electrical network, by this copper shield film 3, can effectively suppress the propagation of noise jamming between the armature winding of transformer 2 and secondary winding.In practical application, can also suppress the noise transmission between armature winding and secondary winding by the number of plies, employing " sandwich winding " or the increase faraday shield layer that reduces winding.
For technique scheme, the utility model obtains following experimental data: portable set is in to battery charging state, make the positive pole probe of oscilloscope/spectrum analyzer be connected with the direct current GND of Devices to test, the negative pole probe is connected with the ground wire of oscilloscope/spectrum analyzer, measures afterwards the common mold noise interference of charger to capacitance touch equipment.For domestic 3.5 cun capacitance touch screen formula mobile phones, the power supply while connecting its standard configuration charger disturbs apparent in view, and during charging, two fingers touches just have serious disorderly newspaper point and occur, and process is measured, and there is the noise of 6V left and right in the standard configuration charger.After the charger that employing the utility model proposes, through measuring, noise amplitude has dropped to below 500mV, and the power supply interference phenomenon is eliminated, and the user also can normally use mobile phone in charging.
The disclosed charger of anti-interference for capacitance touch screen of the utility model, when in the normalized current of electrical network, having the common mode disturbances electric current, this common mode disturbances electric current can make two inductance coils produce magnetic field in the same way and increase the induction reactance of coil, at this moment, inductance coil is high impedance status, and have stronger damping, thereby decay or suppressed this common mode disturbances electric current.Simultaneously, because two inputs of common mode inductance 1 are connected in respectively the ground wire PE of electrical network by capacitor C 1 and capacitor C 2, this capacitor C 1 and capacitor C 2 have formed the circuit structure of Y electric capacity, make interference signal can access effectively and release by capacitor C 1 and capacitor C 2.The utility model compared to existing technologies, can effectively suppress common mode disturbances by this common mode inductance, and by Y electric capacity, interference signal is released, thereby has avoided in charging process using touch-screen and the situation that hop maybe can't operate occurs.
The above is the utility model preferred embodiment, is not limited to the utility model, all modifications of making in technical scope of the present utility model, is equal to and replaces or improvement etc., all should be included in the scope that the utility model protects.
Claims (3)
1. charger of the anti-interference for capacitance touch screen, described charger includes a charger body (1), it is characterized in that, also include a common mode inductance L 1, two inputs of described common mode inductance L1 are connected to live wire L and the zero line N of electrical network, its output is connected with the input of charger body (1), and two inputs of this common mode inductance (1) are connected in respectively the ground wire PE of electrical network by capacitor C 1 and capacitor C 2.
2. the charger of the anti-interference for capacitance touch screen as claimed in claim 1, is characterized in that, the earth terminal GND of the DC output end of described charger body (1) is connected in the ground wire PE of electrical network by capacitor C 3.
3. the charger of the anti-interference for capacitance touch screen as claimed in claim 1, it is characterized in that, described charger body (1) includes a transformer (2), between the armature winding of described transformer (2) and secondary winding, be provided with copper shield film (3), described copper shield film (3) is connected with the ground wire PE of electrical network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202546069U CN203301179U (en) | 2013-05-10 | 2013-05-10 | Anti-interference charger applied to capacitor touch screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202546069U CN203301179U (en) | 2013-05-10 | 2013-05-10 | Anti-interference charger applied to capacitor touch screen |
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| Publication Number | Publication Date |
|---|---|
| CN203301179U true CN203301179U (en) | 2013-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013202546069U Expired - Lifetime CN203301179U (en) | 2013-05-10 | 2013-05-10 | Anti-interference charger applied to capacitor touch screen |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840526A (en) * | 2014-03-17 | 2014-06-04 | 联想(北京)有限公司 | Method and device for processing information and electronic equipment |
| CN105389225A (en) * | 2015-11-25 | 2016-03-09 | 小米科技有限责任公司 | Touch screen reporting point processing method and apparatus |
| CN106451697A (en) * | 2016-08-16 | 2017-02-22 | 深圳天珑无线科技有限公司 | Mobile terminal and common mode interference resistance method |
| WO2024001124A1 (en) * | 2022-06-28 | 2024-01-04 | 阳光电源股份有限公司 | Isolated ac-dc converter, charging device, and power supply system |
-
2013
- 2013-05-10 CN CN2013202546069U patent/CN203301179U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840526A (en) * | 2014-03-17 | 2014-06-04 | 联想(北京)有限公司 | Method and device for processing information and electronic equipment |
| CN103840526B (en) * | 2014-03-17 | 2017-02-01 | 联想(北京)有限公司 | Method and device for processing information and electronic equipment |
| CN105389225A (en) * | 2015-11-25 | 2016-03-09 | 小米科技有限责任公司 | Touch screen reporting point processing method and apparatus |
| CN106451697A (en) * | 2016-08-16 | 2017-02-22 | 深圳天珑无线科技有限公司 | Mobile terminal and common mode interference resistance method |
| WO2024001124A1 (en) * | 2022-06-28 | 2024-01-04 | 阳光电源股份有限公司 | Isolated ac-dc converter, charging device, and power supply system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131120 |