CN207571695U - Tablet charging base short-circuit protection circuit - Google Patents
Tablet charging base short-circuit protection circuit Download PDFInfo
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- CN207571695U CN207571695U CN201721671114.4U CN201721671114U CN207571695U CN 207571695 U CN207571695 U CN 207571695U CN 201721671114 U CN201721671114 U CN 201721671114U CN 207571695 U CN207571695 U CN 207571695U
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- tablet
- resistance
- charging
- circuit
- charge controlling
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Abstract
The utility model discloses a kind of tablet charging base short-circuit protection circuits, including charge controlling chip, connect charge controlling chip charging output terminal and the charging plug on tablet charging base, charging plug has enabled control foot, enabled control foot can be grounded to after the charging jacks grafting on tablet by the corresponding PIN foot on charging jacks, charge controlling chip has Enable Pin, trigger circuit is equipped between Enable Pin and the enabled control foot, trigger circuit triggering charge controlling chip after enabled control foot is grounded by tablet charging jacks is transmitted electricity to tablet;The utility model sheet has the characteristics that circuit is simple, reliability is high, at low cost, strong applicability compared to tradition using overcurrent protection IC or using the method for PTC resistor, can ensure the normal work of machine completely, either with or without security risk.
Description
Technical field
The utility model is related to charging control circuit more particularly to a kind of short-circuit protections being used on tablet charging base
Circuit.
Background technology
The generally common spring thimble style plug of tablet charging base, in no connection tablet, the power supply of 5V in plug
It is existing.Due to there is the presence of 5V power supplys, when outside short circuit metal electrode, the circuit inside charging base can be burnt out,
It could even be possible to fire can be caused, security risk is caused.Therefore, it is necessary to provide one kind when tablet does not have connect base, come
The circuit inside charging base is protected, prevents damage or fire hazard.
Utility model content
The utility model is the above problem of the prior art to be solved, propose it is a kind of be used in it is short on tablet charging base
Protect circuit in road.
In order to solve the above technical problems, the utility model proposes technical solution be a kind of design tablet charging base short circuit
Circuit is protected, including charge controlling chip, connection charge controlling chip charging output terminal and on tablet charging base
Charging plug, the charging plug has enabled control foot, the enabled control foot with after the charging jacks grafting on tablet
It can be grounded by the corresponding PIN foot on charging jacks, the charge controlling chip has Enable Pin, which enables with described
Trigger circuit is equipped between control foot, which triggers charging control after enabled control foot is grounded by tablet charging jacks
Coremaking piece is transmitted electricity to tablet.
The trigger circuit has field-effect tube, the 5th to the 8th resistance, the 23rd resistance, and the drain electrode of field-effect tube connects
One end and the Enable Pin of the 5th resistance and the 6th resistance are connect, the grid of field-effect tube connects one end of the 23rd resistance,
The other end the 7th resistance of connection of 23rd resistance and one end and the enabled control foot of the 8th resistance, the described 5th
With another termination positive pole of the 7th resistance, the other end of the 6th and the 8th resistance and the source electrode of field-effect tube connect
Ground, the field-effect tube use N-channel field-effect tube, and the Enable Pin high level is effective；The power supply is to charge controlling chip
Power supply.
The 31st capacitance is connected between the enabled control foot and ground.
The charge controlling chip uses TPS54302 charge controlling chips.
Compared with prior art, the utility model this patent controls the mode of metal-oxide-semiconductor using a spring thimble, so that it may
To realize the route protection of charging base, there is circuit letter using overcurrent protection IC or using the method for PTC resistor compared to tradition
Single, the characteristics of reliability is high, at low cost, strong applicability, can ensure the normal work of machine, either with or without security risk completely.
Description of the drawings
Fig. 1 is the connection diagram of charging base and tablet；
Fig. 2 circuit block diagrams in order to control；
Fig. 3 is the circuit diagram of preferred embodiment.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is described in further detail the utility model.It should be appreciated that specific embodiment described herein is used only for explaining this
Utility model is not used to limit the utility model.
The utility model discloses a kind of tablet charging base short-circuit protection circuit, referring to Fig. 2 shows control circuit side
Block diagram, this short-circuit protection circuit include charge controlling chip, connect charge controlling chip charging output terminal and mounted on tablet
Charging plug 1 on charging base, the charging plug have enabled control foot, the enabled control foot with the charging on tablet
The corresponding PIN foot on charging jacks can be passed through after jack grafting（EN）Ground connection, the charge controlling chip have Enable Pin, this makes
Trigger circuit can be equipped between end and the enabled control foot, which is connect in enabled control foot by tablet charging jacks
Charge controlling chip is triggered behind ground to transmit electricity to tablet.
This short-circuit protection circuit can be used in exposed alive plug, and Fig. 1 shows this circuit in tablet charging base
On utilization, the charging plug 1 on charging base has 7 PIN needles（Spring thimble）Wherein there are 2 PIN needle connection control cores
The 5V anodes of piece output, the 5V cathode of 2 PIN needle connection control chip output, an also PIN needle is enabled control foot
（SYS_PWR_EN）, can be by connecting the ground in tablet, SYS_PWR_ after this enabled control foot is inserted into the charging jacks of tablet
EN will be pulled low so that the trigger circuit of the enabled control foot of connection（Q1）Action, and then trigger circuit makes charge controlling chip
Enable Pin it is effective, charge controlling chip（TPS54302）It transmits electricity to tablet.Control is enabled when on charging base without inserting tablet
Foot processed（SYS_PWR_EN）Vacantly, trigger circuit is not triggered, and the Enable Pin of charge controlling chip is invalid, and charge controlling chip stops
It only exports, charging plug 1 is without electricity, so as to avoid the security risks such as short circuit.
Referring to the circuit diagram of the preferred embodiment shown in Fig. 3, the trigger circuit has field-effect tube Q1, the 5th to the 8th
Resistance, the 23rd resistance R23, drain electrode connection one end of the 5th resistance R5 and the 6th resistance R6 of field-effect tube and described
Enable Pin, the grid of field-effect tube connect one end of the 23rd resistance, and the other end of the 23rd resistance connects the 7th resistance R7
One end and the enabled control foot with the 8th resistance R8, another termination positive pole of the 5th and the 7th resistance, institute
It states the other end of the 6th and the 8th resistance and the source electrode ground connection of field-effect tube, the field-effect tube uses N-channel field-effect
Pipe, the Enable Pin high level are effective；The power supply is powered to charge controlling chip.It is connected between the enabled control foot and ground
31st capacitance C31.The charge controlling chip uses TPS54302 charge controlling chips.
The operation principle of this circuit is described in detail in circuit diagram with reference to shown in Fig. 3：When there is no tablet connect base, control is enabled
Foot（SYS_PWR_EN）Vacantly, the grid of metal-oxide-semiconductor Q1 is acted in the partial pressure of resistance R7, R8, R23 in 3.1V high voltages, Q1 saturations
It is connected, moves the current potential of R5, R6 tie point to 0V after saturation conduction, the Enable Pin of the charge controlling chip U3 so as to make（5th foot
EN）Voltage be also 0V, U3 does not work, and does not transmit electricity outward, avoids the security risks such as short circuit.After tablet is connected to pedestal,
SYS_PWR_EN passes through the corresponding PIN foot on tablet（EN）Ground connection, SYS_PWR_EN can be by 3.1V（R7 and R8 partial pressure gained）Become
For 0V, Q1 is NMOS tube, and Vgs=0V when grid G is 0V, Q1 becomes ending from saturation conduction, the 5th foot of U3 after Q1 cut-offs
（EN）3.1V is just become from 0V, is charged so as to which U3 work exports 5V voltages to tablet.
Above example is by way of example only, non-to provide constraints.It is any without departing from the application spirit and scope, and to it
The equivalent modifications of progress or change, shall be included in the scope of claims of this application.
Claims (4)
1. a kind of tablet charging base short-circuit protection circuit, including charge controlling chip, connection charge controlling chip charging output
The charging plug held and be mounted on tablet charging base（1）, the charging plug, which has, enables control foot, the enabled control
Foot can be grounded to after the charging jacks grafting on tablet by the corresponding PIN foot on charging jacks, it is characterised in that：It is described to fill
Electric control chip has Enable Pin, is equipped with trigger circuit between the Enable Pin and the enabled control foot, which makes
Foot can be controlled to trigger charge controlling chip after being grounded by tablet charging jacks to transmit electricity to tablet.
2. tablet charging base short-circuit protection circuit as described in claim 1, it is characterised in that：The trigger circuit has field
Effect pipe（Q1）, the 5th to the 8th resistance, the 23rd resistance（R23）, drain electrode the 5th resistance of connection of field-effect tube（R5）With
6th resistance（R6）One end and the Enable Pin, the grid of field-effect tube connect one end of the 23rd resistance, the 23rd
The other end of resistance connects the 7th resistance（R7）With the 8th resistance（R8）One end and the enabled control foot, the described 5th
With another termination positive pole of the 7th resistance, the other end of the 6th and the 8th resistance and the source electrode of field-effect tube connect
Ground, the field-effect tube use N-channel field-effect tube, and the Enable Pin high level is effective；The power supply is to charge controlling chip
Power supply.
3. tablet charging base short-circuit protection circuit as claimed in claim 2, it is characterised in that：The enabled control foot and ground
Between connect the 31st capacitance（C31）.
4. tablet charging base short-circuit protection circuit as claimed in claim 3, it is characterised in that：The charge controlling chip is adopted
With TPS54302 charge controlling chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721671114.4U CN207571695U (en) | 2017-12-05 | 2017-12-05 | Tablet charging base short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721671114.4U CN207571695U (en) | 2017-12-05 | 2017-12-05 | Tablet charging base short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207571695U true CN207571695U (en) | 2018-07-03 |
Family
ID=62690049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721671114.4U Active CN207571695U (en) | 2017-12-05 | 2017-12-05 | Tablet charging base short-circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207571695U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193883A (en) * | 2018-11-28 | 2019-01-11 | 华勤通讯技术有限公司 | The charging base and its control circuit of smartwatch |
-
2017
- 2017-12-05 CN CN201721671114.4U patent/CN207571695U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193883A (en) * | 2018-11-28 | 2019-01-11 | 华勤通讯技术有限公司 | The charging base and its control circuit of smartwatch |
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