CN208571679U - The electrostatic discharge circuit of mobile terminal - Google Patents
The electrostatic discharge circuit of mobile terminal Download PDFInfo
- Publication number
- CN208571679U CN208571679U CN201821317897.0U CN201821317897U CN208571679U CN 208571679 U CN208571679 U CN 208571679U CN 201821317897 U CN201821317897 U CN 201821317897U CN 208571679 U CN208571679 U CN 208571679U
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- Prior art keywords
- electrostatic
- discharge circuit
- lithium ion
- ion battery
- electrostatic discharge
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Protection Of Static Devices (AREA)
Abstract
The utility model provides a kind of electrostatic discharge circuit of mobile terminal, the electrostatic discharge circuit includes: at least one electrostatic interference protective device, one end of each electrostatic interference protective device is connected to the negative terminal for charge and discharge of lithium ion battery, and the other end of each electrostatic interference protective device is connected to the negative terminal for being used to detect cell voltage of lithium ion battery.The electrostatic discharge circuit of the mobile terminal of the utility model can eliminate exterior static, to avoid exterior static interference lithium ion battery.
Description
Technical field
The utility model all things considered is related to circuit field, more particularly, is related to a kind of static discharge of mobile terminal
Circuit.
Background technique
Currently, mobile terminal is usually powered by lithium ion battery.Fig. 1 shows existing lithium ion battery and movement eventually
The connection schematic diagram at end, referring to Fig.1, lithium ion battery 1 is usually by 20 (Protection of battery core 10 (CELL) and protection board
Circuit Model, PCM) composition.On protection board 20 built-in protection chip 30 (IC), thus to lithium ion battery 1 carry out with
Lower protection: (1) additives for overcharge protection, for example, when protection chip 30 detects that the voltage of lithium ion battery 1 reaches overcharge voltage
When, overcharge protection is triggered, to stop charging；(2) over, for example, when protection chip 30 detect lithium from
When the voltage of sub- battery 1 is lower than over-discharge piezoelectric voltage, deep-discharge protection is triggered, to stop discharging, and makes lithium ion battery 1
Standby mode in low quiescent current；(3) overcurrent and short-circuit protection, when protection chip 30 detects lithium ion battery 1
When discharge current is excessive or short circuit occurs, excess current protective function is triggered.At above-mentioned three kinds, protection chip 30 passes through control
Field-effect tube 40 (FET) processed cuts off the link circuit between battery core 10 and the mainboard 2 of mobile terminal, thus cutting to it is mobile eventually
The power supply at end.
When lithium ion battery 1 is by exterior static interference, be easy to cause protection 30 erroneous judgement of chip, thus trigger lithium from
Sub- battery 1 enter guard mode, cause mobile terminal because lithium ion battery 1 electricity shortage due to shut down.
Utility model content
The purpose of this utility model is to provide a kind of electrostatic discharge circuits of mobile terminal, can eliminate exterior static,
To avoid exterior static interference lithium ion battery.
The utility model provides a kind of electrostatic discharge circuit of mobile terminal, comprising: at least one electrostatic interference protector
One end of part, each electrostatic interference protective device is connected to the negative terminal for charge and discharge of lithium ion battery, each electrostatic
The other end of interference prevention device is connected to the negative terminal for being used to detect cell voltage of lithium ion battery.
Optionally, when the electrostatic discharge circuit includes multiple electrostatic interference protective devices, the multiple electrostatic interference
It is connected in parallel between protective device.
Optionally, the electrostatic discharge circuit further include: at least one fuse, wherein at least one described fuse
Quantity it is identical as the quantity of at least one electrostatic interference protective device, and to be connected in series to an electrostatic dry for a fuse
Disturb protective device.
Optionally, one end of each fuse is connected to the other end of corresponding electrostatic interference protective device, each
The other end of fuse is connected to the negative terminal for being used to detect cell voltage of lithium ion battery.
Optionally, the electrostatic discharge circuit further include: with multiple concatenated insurances of electrostatic interference protective device in parallel
Silk, wherein one end of the fuse is connected to the other end of each electrostatic interference protective device, the fuse it is another
One end is connected to the negative terminal for being used to detect cell voltage of lithium ion battery.
Optionally, each electrostatic interference protective device includes: diode and/or varistor and/or capacitor, and described two
The cathode of pole pipe is connected to the negative terminal for charge and discharge of lithium ion battery, and the anode of the diode is connected to lithium ion
The negative terminal for being used to detect cell voltage of battery.
Optionally, the diode includes: zener diode and/or Transient Suppression Diode.
Optionally, the electrostatic discharge circuit is arranged on the mainboard of the mobile terminal.
The electrostatic discharge circuit of the mobile terminal of the utility model can eliminate exterior static, to avoid exterior static
Interfere lithium ion battery.In addition, also electrostatic interference protective device and fuse are connected, to be sent out in electrostatic interference protective device
When raw damage, electrostatic discharge circuit is cut off by blown fuse, to guarantee the normal work of lithium ion battery.
Detailed description of the invention
By the detailed description carried out below in conjunction with the accompanying drawings, above and other objects, features and advantages of the utility model
It will become apparent, in which:
Fig. 1 shows the connection schematic diagram of existing lithium ion battery and mobile terminal；
Fig. 2 shows the schematic diagrames of the electrostatic discharge circuit of the mobile terminal of embodiment according to the present utility model；
Fig. 3 shows the block schematic illustration of existing all-metal mobile phone.
Specific embodiment
Now, different example embodiments is more fully described with reference to the accompanying drawings, wherein some exemplary embodiments are attached
It is shown in figure.
The electrostatic discharge circuit of the mobile terminal of embodiment according to the present utility model is described referring to Fig. 2.
Fig. 2 shows the schematic diagrames of the electrostatic discharge circuit of the mobile terminal of embodiment according to the present utility model.
Referring to Fig. 2, the electrostatic discharge circuit of the mobile terminal of embodiment according to the present utility model can include: at least one
Electrostatic interference protective device 100.
One end of each electrostatic interference protective device 100 is connected to the negative terminal for charge and discharge of lithium ion battery 1
P-, the other end of each electrostatic interference protective device 100 are connected to the negative pole end for being used to detect cell voltage of lithium ion battery 1
Sub- S-.In other words, when the quantity of electrostatic interference protective device 100 is more than one, between each electrostatic interference protective device 100
It is connected in parallel.
When electrostatic interference occurs, negative pole end for charge and discharge of the electrostatic interference protective device 100 from lithium ion battery 1
Sub- P- receives static discharge current, and is used to detect the negative of cell voltage for what static discharge current was output to lithium ion battery 1
Extremely sub- S-.
It is appreciated that the protection chip in lithium ion battery is connected to the negative pole end for charge and discharge of lithium ion battery 1
Sub- P-, since static discharge current can be discharged by electrostatic interference protective device 100 from the negative terminal P- for charge and discharge
For detecting the negative terminal S- (that is, electrostatic interference protective device 100 can eliminate static discharge current) of cell voltage, thus
Protection chip is avoided, protection chip erroneous judgement caused by electrostatic interference is effectively prevented, and then avoids occurring because of false triggering lithium
Ion battery 1 enter electric current and short-circuit protection state and caused by lithium ion battery the phenomenon that can not work normally, effectively improve
The anti-static electricity interference ability of lithium ion battery 1.
As an example, when the protection board design in lithium ion battery is unreasonable (for example, the printed circuit board in protection board
(Printed Circuit Board, PCB) cabling or device layout are unreasonable), the electrostatic protection device in lithium ion battery
Damage or lithium ion battery in electrostatic protection device improper use when, lithium ion battery can be by exterior static interference, i.e.,
Electrostatic interference occurs.
As an example, electrostatic interference protective device 100 can include: diode, varistor, capacitor etc..
The cathode of diode is connected to the negative terminal P- for charge and discharge of lithium ion battery, the anode connection of diode
To lithium ion battery for detecting the negative terminal S- of cell voltage.
As an example, diode can include: zener diode, Transient Suppression Diode etc..
Preferably, electrostatic discharge circuit can further include: at least one fuse 200.The quantity and electrostatic of fuse 200 are dry
The quantity for disturbing protective device 100 is identical, and a fuse 200 can be connected in series in each electrostatic interference protective device 100.This
In the case of, one end of each fuse 200 is connected to the other end of corresponding electrostatic interference protective device 100 (that is, with even
Be connected to the different other end in one end of the negative terminal P- for charge and discharge of lithium ion battery 1), each fuse 200 it is another
One end is connected to the negative terminal S- for being used to detect cell voltage of lithium ion battery.
On the other hand, electrostatic discharge circuit can further include: with multiple concatenated insurances of electrostatic interference protective device in parallel
Silk (not shown).In this case, one end of fuse is connected to the other end of each electrostatic interference protective device
(that is, from be connected to lithium ion battery 1 the other ends different for one end of negative terminal P- of charge and discharge), fuse it is another
One end is connected to the negative terminal S- for being used to detect cell voltage of lithium ion battery.
It is appreciated that by the way that fuse 200 is connected in series to electrostatic interference protective device 100, it can be in electrostatic interference protector
It when part 100 is damaged, is fused by fuse 200 and cuts off electrostatic discharge circuit, so that lithium ion battery 1 can continue pair
Mobile terminal is powered.
The fuse 200 of the present embodiment can also be the insurance device of other forms, as long as can be in electrostatic interference protector
Guarantee that lithium ion battery 1 works normally when part 100 is damaged.
As an example, electrostatic discharge circuit may be provided on the mainboard 2 of mobile terminal.
The specific example of the electrostatic discharge circuit of the mobile terminal of the utility model is described in detail below with reference to Fig. 3.
Fig. 3 shows the block schematic illustration of existing all-metal mobile phone.
Referring to Fig. 3, by taking mobile terminal is all-metal mobile phone as an example, all-metal mobile phone can include: mainboard 2, display screen 3, in
Frame 4, platelet 5, rear shell 6 and screening cover 7.Mainboard 2, center 4, platelet 5, rear shell 6 and screening cover 7 are metal.Lithium ion battery 1
Between center 4 and rear shell 6.
When existing all-metal mobile phone is inserted into earphone, if when the send key of earphone applies the electrostatic 8 of 8KV, Quan Jin
Automatic shutdown can be easy to by belonging to mobile phone, the reason is that: it, can be with 6 shape of rear shell when electrostatic 8 enters center 4 by " ground " of platelet 5
At coupling, to interfere lithium ion battery 1, leads to the protection chip erroneous judgement in lithium ion battery 1, cause lithium ion battery 1
False triggering enters guard mode, and lithium ion battery is caused to become 3V voltage below from normal voltage, thus all-metal mobile phone because
Lithium ion battery electricity shortage causes to shut down.
Increase the electrostatic discharge circuit of the utility model in existing all-metal mobile phone, the electrostatic discharge circuit is by electrostatic
8 eliminate, and avoid electrostatic 8 and interfere lithium ion battery 1, guarantee that lithium ion battery 1 is normally powered all-metal mobile phone.
In addition, the electrostatic discharge circuit of the mobile terminal of the utility model, can eliminate exterior static, to avoid outside
Electrostatic interference lithium ion battery.In addition, also electrostatic interference protective device and fuse are connected, thus in electrostatic interference protector
When part is damaged, electrostatic discharge circuit is cut off by blown fuse, to guarantee the normal work of lithium ion battery.
Although being particularly shown and describing the utility model referring to its exemplary embodiment, the technology of this field
Personnel, can be to it should be understood that in the case where not departing from the spirit and scope of the utility model defined by claim
It carries out various changes of form and details.
Claims (8)
1. a kind of electrostatic discharge circuit of mobile terminal, which is characterized in that the electrostatic discharge circuit includes:
One end of at least one electrostatic interference protective device, each electrostatic interference protective device is connected to being used for for lithium ion battery
The negative terminal of charge and discharge, the other end of each electrostatic interference protective device are connected to the electric for detecting battery of lithium ion battery
The negative terminal of pressure.
2. electrostatic discharge circuit as described in claim 1, which is characterized in that when the electrostatic discharge circuit includes multiple electrostatic
When interference prevention device, it is connected in parallel between the multiple electrostatic interference protective device.
3. electrostatic discharge circuit as described in claim 1, which is characterized in that the electrostatic discharge circuit further include: at least one
A fuse, wherein the quantity phase of the quantity of at least one fuse and at least one electrostatic interference protective device
Together, and a fuse is connected in series to an electrostatic interference protective device.
4. electrostatic discharge circuit as claimed in claim 3, which is characterized in that one end of each fuse is connected to corresponding quiet
The other end of electrical interference protective device, the other end of each fuse are connected to the electric for detecting battery of lithium ion battery
The negative terminal of pressure.
5. electrostatic discharge circuit as claimed in claim 2, which is characterized in that the electrostatic discharge circuit further include: with it is in parallel
Multiple concatenated fuses of electrostatic interference protective device, wherein it is anti-that one end of the fuse is connected to each electrostatic interference
The other end of device is protected, the other end of the fuse is connected to the cathode for being used to detect cell voltage of lithium ion battery
Terminal.
6. the electrostatic discharge circuit as described in any one of claim 1 to 5, which is characterized in that each electrostatic interference protection
Device includes:
Diode and/or varistor and/or capacitor,
The cathode of the diode is connected to the negative terminal for charge and discharge of lithium ion battery, and the anode of the diode is even
It is connected to the negative terminal for being used to detect cell voltage of lithium ion battery.
7. electrostatic discharge circuit as claimed in claim 6, which is characterized in that the diode include: zener diode and/or
Transient Suppression Diode.
8. the electrostatic discharge circuit as described in any one of claim 1 to 5, which is characterized in that the electrostatic discharge circuit
It is arranged on the mainboard of the mobile terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821317897.0U CN208571679U (en) | 2018-08-15 | 2018-08-15 | The electrostatic discharge circuit of mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821317897.0U CN208571679U (en) | 2018-08-15 | 2018-08-15 | The electrostatic discharge circuit of mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208571679U true CN208571679U (en) | 2019-03-01 |
Family
ID=65450653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821317897.0U Active CN208571679U (en) | 2018-08-15 | 2018-08-15 | The electrostatic discharge circuit of mobile terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208571679U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021093000A1 (en) * | 2019-11-13 | 2021-05-20 | Tcl华星光电技术有限公司 | Level shifter ic and display device |
-
2018
- 2018-08-15 CN CN201821317897.0U patent/CN208571679U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021093000A1 (en) * | 2019-11-13 | 2021-05-20 | Tcl华星光电技术有限公司 | Level shifter ic and display device |
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