CN206452142U - A kind of charging device and its charging reversal connection protection circuit - Google Patents
A kind of charging device and its charging reversal connection protection circuit Download PDFInfo
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- CN206452142U CN206452142U CN201720068974.2U CN201720068974U CN206452142U CN 206452142 U CN206452142 U CN 206452142U CN 201720068974 U CN201720068974 U CN 201720068974U CN 206452142 U CN206452142 U CN 206452142U
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Abstract
The utility model belongs to power technique fields, and there is provided a kind of charging device and its charging reversal connection protection circuit.Charging reversal connection protection circuit is built in charging device, the charging circuit in charging reversal connection protection circuit connection charging device, the output end output direct current of charging circuit and the positive output end for connecting charging device；The reversal connection protection circuit that charges includes first switch unit and second switch unit；When the positive output end and negative output terminal of charging device connect the negative pole and positive pole of external cell respectively, first switch unit is turned off under the cathode voltage effect of external cell, second switch unit is also turned off therewith after the shut-off of first switch unit, to disconnect the path between the loop end of charging circuit and the positive pole of external cell.It can be to disconnect the loop between charging device and battery in the both positive and negative polarity reversal connection of the positive-negative output end and battery of charging device, solve charging device and there is the problem of burning damage and cause fire in the both positive and negative polarity reversal connection of its positive-negative output end and battery.
Description
Technical field
The utility model belongs to power technique fields, more particularly to a kind of charging device and its charging reversal connection protection circuit.
Background technology
With social development, mobile device is by people's extensive use, and most mobile device has battery, and battery needs
Charging.Because battery has point of both positive and negative polarity, when charger charges to battery, if the positive-negative output end and battery of charger
Both positive and negative polarity is reversed, then charger can be made to burn damage, and burnt user, and fire may be caused when serious.Therefore, it is existing to fill
There is the problem of burning damage and cause fire in the both positive and negative polarity reversal connection of its positive-negative output end and battery in electrical equipment.
Utility model content
The purpose of this utility model is to provide a kind of charging device and its charging reversal connection protection circuit, it is intended to solve charging
There is the problem of burning damage and cause fire in the both positive and negative polarity reversal connection of its positive-negative output end and battery in device.
The utility model provides a kind of charging reversal connection protection circuit, is built in charging device, and the charging reversal connection is prevented
Protection circuit connects the charging circuit in the charging device, and the output end of the charging circuit is exported fills described in direct current and connection
The positive output end of electric installation；The charging reversal connection protection circuit includes first switch unit and second switch unit；
The input of the first switch unit is connected with the output end of the charging circuit, the first switch unit
Output end is connected with the controlled end of the second switch unit, the controlled end of the first switch unit and the second switch list
The input of member is connected to the negative output terminal of the charging device, the loop connection end of the first switch unit and described second altogether
The output end of switch element is connected to the loop end of the charging circuit altogether；
It is described when the positive output end and negative output terminal of the charging device connect the positive pole and negative pole of external cell respectively
First switch unit is turned under the driving of the direct current, and the second switch unit is after first switch unit conducting
Also turn on therewith, so as to form charge circuit between the charging circuit and the external cell；
When the positive output end and negative output terminal of the charging device connect the negative pole and positive pole of the external cell respectively,
The first switch unit is turned off under the cathode voltage effect of the external cell, and the second switch unit is described first
Also turned off therewith after switch element shut-off, to disconnect between the loop end of the charging circuit and the positive pole of the external cell
Path.
The utility model additionally provides a kind of charging device, including charging circuit, and the charging device also includes above-mentioned fill
Electric reversal connection protection circuit.
The utility model in the charging reversal connection protection circuit being connected with the charging circuit in charging device by setting
One switch element and second switch unit, the positive pole of external cell is connected in the positive output end and negative output terminal of charging device respectively
During with negative pole, first switch unit is turned under the driving of direct current, and second switch unit is after the conducting of first switch unit
Turn on therewith, so as to form charge circuit between charging circuit and external cell；In the positive output end and negative output of charging device
When end connects the negative pole and positive pole of external cell respectively, first switch unit is turned off under the cathode voltage effect of external cell,
Second switch unit is also turned off therewith after the shut-off of first switch unit, to disconnect loop end and the external cell of charging circuit
Path between positive pole.Can be to disconnect charging device and electricity in the both positive and negative polarity reversal connection of the positive-negative output end and battery of charging device
Loop between pond, efficiently solve charging device in the both positive and negative polarity reversal connection of its positive-negative output end and battery exist burn damage
The problem of going bad and cause fire.
Brief description of the drawings
, below will be to embodiment or prior art in order to illustrate more clearly of the technical scheme in the utility model embodiment
The accompanying drawing used required in description is briefly described, it should be apparent that, drawings in the following description are of the present utility model
Some embodiments, for those of ordinary skill in the art, without having to pay creative labor, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is the structural representation for the charging reversal connection protection circuit that the utility model embodiment is provided；
Fig. 2 is the electrical block diagram for the charging reversal connection protection circuit that the utility model embodiment is provided.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain
The utility model, is not used to limit the utility model.
It should be noted that term " comprising " in specification and claims of the present utility model and they are any
Deformation, it is intended that covering is non-exclusive to be included.System, product or equipment for example comprising a series of units are not limited to
The unit listed, but alternatively also include the step of do not list or unit, or alternatively also include for these products or
The intrinsic other units of equipment.In addition, term " first ", " second " and " the 3rd " etc. is to be used to distinguish different objects, Er Feiyong
In description particular order.
The utility model embodiment exists to solve charger in the both positive and negative polarity reversal connection of its positive-negative output end and battery
The problem of burning damage and cause fire is there is provided a kind of charging device and its charging reversal connection protection circuit, by with filling
First switch unit and second switch unit are set in the charging reversal connection protection circuit of charging circuit connection in electric installation, filled
When the positive output end and negative output terminal of electric installation connect the positive pole and negative pole of external cell respectively, first switch unit is in direct current
Driving under turn on, second switch unit first switch unit conducting after also turn on therewith so that charging circuit and external electrical
Charge circuit is formed between pond；The negative pole and positive pole of external cell are connected respectively in the positive output end and negative output terminal of charging device
When, first switch unit is turned off under the cathode voltage effect of external cell, and second switch unit is turned off in first switch unit
Also turn off therewith afterwards, to disconnect the path between the loop end of charging circuit and the positive pole of external cell.Can be in charging device
Positive-negative output end and the both positive and negative polarity reversal connection of battery be to disconnect the loop between charging device and battery, efficiently solve charging
There is the problem of burning damage and cause fire in the both positive and negative polarity reversal connection of its positive-negative output end and battery in device.
In order to illustrate above-mentioned charging device and its charging reversal connection protection circuit, carried out below in conjunction with specific embodiment detailed
Describe in detail bright：
Fig. 1 shows the structure for the charging reversal connection protection circuit that the utility model embodiment is provided, for convenience of description, only
The part related to the embodiment of the present invention is shown, details are as follows：
As shown in figure 1, charging reversal connection protection circuit 10 provided in an embodiment of the present invention, is built in charging device, charges
Charging circuit 20 in the connection charging device of reversal connection protection circuit 10, the output end output direct current of charging circuit 20 and connection institute
State the positive output end Vout+ of charging device；The reversal connection protection circuit 10 that charges includes first switch unit 101 and second switch list
Member 102.
The input of first switch unit 101 is connected with the output end of charging circuit 20, first switch unit 101 it is defeated
Go out end to be connected with the controlled end of second switch unit 102, controlled end and the second switch unit 102 of first switch unit 101
Input is connected to the negative output terminal Vout- of charging device, loop connection end and the second switch unit of first switch unit 101 altogether
102 output end is connected to the loop end of charging circuit 20 altogether.
The positive pole and negative pole of external cell are connected respectively in the positive output end Vout+ and negative output terminal Vout- of charging device
When, first switch unit 101 is turned under the driving of direct current, and second switch unit 102 is after the conducting of first switch unit 101
Also turn on therewith, so as to form charge circuit between charging circuit 20 and external cell；
The negative pole and positive pole of external cell are connected respectively at positive output end Vout+ and negative output the Vout- end of charging device
When, first switch unit 101 is turned off under the cathode voltage effect of external cell, and second switch unit 102 is in first switch list
Also turned off therewith after the shut-off of member 101, to disconnect the path between the loop end of charging circuit 20 and the positive pole of external cell.
It should be noted that charging circuit refers to provide the circuit that direct current is given to external power source charging, it is anti-with charging
Take over control circuit connection.
Fig. 2 shows the circuit structure for the charging reversal connection protection that the utility model embodiment is provided, for convenience of description, only
The part related to the utility model embodiment is shown, details are as follows：
As shown in Fig. 2 as the embodiment of the utility model one, first switch unit 101 includes：First resistor R1, second
Resistance R2, first switch pipe Q1, the first diode D1 and 3rd resistor R3.
First resistor R1 first end is the input of first switch unit 101, and second resistance R2 first end is first
The loop connection end of switch element 101, first switch pipe Q1 output end is the output end of first switch unit 101, the first electricity
The input that R1 the second end is connected to first switch pipe Q1 with second resistance R2 the second end altogether is hindered, first switch pipe Q1's is controlled
The first diode D1 of end connection anode, the first diode D1 negative electrode connection 3rd resistor R3 first end, 3rd resistor R3
The second end be first switch unit 101 controlled end.Specifically, first switch pipe Q1 is PNP type triode, the pole of positive-negative-positive three
The input of the transmitting extremely first switch pipe of pipe, the base stage of PNP type triode is the controlled end of first switch pipe, positive-negative-positive three
The output end of the current collection of pole pipe extremely first switch pipe.
Second switch unit 102 includes：4th resistance R4, the 5th resistance R5 and second switch pipe Q2.
4th resistance R4 first end is the output end of second switch unit 101, and the 5th resistance R5 first end is second
The controlled end of switch element 101, second switch pipe Q2 input is 102 inputs of second switch unit, second switch pipe
Q2 output end is connected with the 4th resistance R4 first end, and the 4th resistance R4 the second end and the 5th resistance R5 the second end is common
Connect second switch pipe Q2 controlled end.Specifically, second switch pipe Q2 is NMOS tube, the grid of NMOS tube is second switch pipe
Controlled end, the source electrode of NMOS tube is the output end of second switch pipe, the drain electrode of NMOS tube for first switch pipe input.
Above-mentioned charging reversal connection protection circuit is described further below in conjunction with operation principle and Fig. 2：
The positive pole and negative pole of external cell are connected respectively in the positive output end Vout+ and negative output terminal Vout- of charging device
When, the first resistor R1, PNP type triode Q1, the first diode D1 and 3rd resistor R3 and external cell form loop,
Now PNP type triode Q1 is turned on.The grid of 4th resistance R4 and the 5th resistance R5 partial pressures to NMOS tube Q2 so that NMOS tube Q2
Conducting, so that forming loop between charging circuit 20 and external cell, i.e. charging circuit 20 charges to external cell.
The negative pole and positive pole of external cell are connected respectively in the positive output end Vout+ and negative output terminal Vout- of charging device
When, because the first diode D1 negative electrode is in high level state, therefore, the first diode D1 is in cut-off state, now
PNP type triode Q1 is turned off, with PNP type triode Q1 shut-off so that NMOS tube Q2 is closed because no driving voltage is in
Disconnected state, to disconnect the path between the loop end of charging circuit 20 and the positive pole of external cell.I.e. charging circuit 20 is not external
Portion's battery is charged.
The utility model embodiment passes through in the charging reversal connection protection circuit being connected with the charging circuit in charging device
First switch unit and second switch unit are set, and first switch unit includes：First resistor, second resistance, first switch pipe,
First diode and 3rd resistor, second switch unit include：4th resistance, the 5th resistance and second switch pipe, wherein, first
Switching tube is PNP type triode, and second switch pipe is NMOS tube, is connected respectively in the positive output end and negative output terminal of charging device
When connecing the positive pole and negative pole of external cell, first switch pipe is turned under the driving of direct current, and second switch pipe is in first switch
Also turned on therewith after pipe conducting, so as to form charge circuit between charging circuit and external cell；In the positive output of charging device
When end and negative output terminal connect the negative pole and positive pole of external cell respectively, first switch pipe is acted in the cathode voltage of external cell
Lower shut-off, second switch pipe is also turned off, to disconnect charging circuit therewith due to no driving voltage after the shut-off of first switch pipe
Loop end and external cell positive pole between path.Therefore, the utility model embodiment can be in the positive and negative of charging device
The both positive and negative polarity reversal connection of output end and battery is to disconnect the loop between charging device and battery, efficiently solves charging device and exists
There is the problem of burning damage and cause fire during the both positive and negative polarity reversal connection of its positive-negative output end and battery.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Any modifications, equivalent substitutions and improvements made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (6)
1. one kind charging reversal connection protection circuit, is built in charging device, the charging reversal connection protection circuit connects the charging
Charging circuit in device, the output end output direct current of the charging circuit and the positive output end of the connection charging device；
Characterized in that, the charging reversal connection protection circuit includes first switch unit and second switch unit；
The input of the first switch unit is connected with the output end of the charging circuit, the output of the first switch unit
End is connected with the controlled end of the second switch unit, the controlled end of the first switch unit and the second switch unit
Input is connected to the negative output terminal of the charging device, loop connection end and the second switch of the first switch unit altogether
The output end of unit is connected to the loop end of the charging circuit altogether；
When the positive output end and negative output terminal of the charging device connect the positive pole and negative pole of external cell respectively, described first
Switch element is turned under the driving of the direct current, the second switch unit the first switch unit conducting after also with
Conducting, so as to form charge circuit between the charging circuit and the external cell；
It is described when the positive output end and negative output terminal of the charging device connect the negative pole and positive pole of the external cell respectively
First switch unit is turned off under the cathode voltage effect of the external cell, and the second switch unit is in the first switch
Also turned off therewith after unit shut-off, it is logical between the loop end of the charging circuit and the positive pole of the external cell to disconnect
Road.
2. charging reversal connection protection circuit according to claim 1, it is characterised in that the first switch unit includes：
First resistor, second resistance, first switch pipe, the first diode and 3rd resistor；
The first end of the first resistor is the input of the first switch unit, and the first end of the second resistance is described
The loop connection end of first switch unit, the output end of the first switch pipe is the output end of the first switch unit, institute
State the second end of first resistor and be connected to the input of the first switch pipe, described first altogether with the second end of the second resistance
The controlled end of switching tube connects the anode of first diode, and the negative electrode of first diode connects the 3rd resistor
First end, the second end of the 3rd resistor is the controlled end of the first switch unit.
3. charging reversal connection protection circuit according to claim 1, it is characterised in that the second switch unit includes：
4th resistance, the 5th resistance and second switch pipe；
The first end of 4th resistance is the output end of the second switch unit, and the first end of the 5th resistance is described
The controlled end of second switch unit, the input of the second switch pipe is the input of the second switch unit, described the
The output end of two switching tubes is connected with the first end of the 4th resistance, the second end and the 5th resistance of the 4th resistance
The second end connect the controlled end of the second switch pipe jointly.
4. charging reversal connection protection circuit according to claim 2, it is characterised in that the first switch pipe is positive-negative-positive three
Pole pipe, the input of the extremely described first switch pipe of transmitting of the PNP type triode, the base stage of the PNP type triode is
The controlled end of the first switch pipe, the output end of the extremely described first switch pipe of current collection of the PNP type triode.
5. charging reversal connection protection circuit according to claim 3, it is characterised in that
The second switch pipe is NMOS tube, and the grid of the NMOS tube is the controlled end of the second switch pipe, the NMOS
The source electrode of pipe is the output end of the second switch pipe, and the drain electrode of the NMOS tube is the input of the first switch pipe.
6. a kind of charging device, including charging circuit, it is characterised in that the charging device also includes claim 1-5 such as and appointed
Charging reversal connection protection circuit described in meaning one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720068974.2U CN206452142U (en) | 2017-01-17 | 2017-01-17 | A kind of charging device and its charging reversal connection protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720068974.2U CN206452142U (en) | 2017-01-17 | 2017-01-17 | A kind of charging device and its charging reversal connection protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206452142U true CN206452142U (en) | 2017-08-29 |
Family
ID=59668240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720068974.2U Active CN206452142U (en) | 2017-01-17 | 2017-01-17 | A kind of charging device and its charging reversal connection protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206452142U (en) |
-
2017
- 2017-01-17 CN CN201720068974.2U patent/CN206452142U/en active Active
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