CN207459714U - For the protection circuit between the 5V interfaces and automobile batteries of vehicle-mounted USB - Google Patents
For the protection circuit between the 5V interfaces and automobile batteries of vehicle-mounted USB Download PDFInfo
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- CN207459714U CN207459714U CN201721695652.7U CN201721695652U CN207459714U CN 207459714 U CN207459714 U CN 207459714U CN 201721695652 U CN201721695652 U CN 201721695652U CN 207459714 U CN207459714 U CN 207459714U
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Abstract
The utility model discloses one kind to be easily achieved; circuit framework is simple, the protection circuit between stable, inexpensive and breakdown can effectively avoid the 5V interfaces of the USB and automobile batteries short circuit when 5V interface and automobile batteries for vehicle-mounted USB, it includes metal-oxide-semiconductor Q1, triode Q2, resistance R1, R2, R3 and voltage-stabiliser tube ZD1；The 5th pin, the 6th pin, the 5V voltage output ends of the 7th pin and the 8th pin with vehicle-mounted USB charging chips of metal-oxide-semiconductor Q1 is connected；The first pin of metal-oxide-semiconductor Q1, second pin are connected after being connected with each other with the 3rd pin with the emitter of the triode Q2, and by being grounded after resistance R2, the 4th pin of metal-oxide-semiconductor Q1 is connected the 4th pin of metal-oxide-semiconductor Q1 with the collector of triode Q2 simultaneously；The base stage of the triode Q2 separates two paths of signals, and all the way by being connected after resistance R1 with the emitter of triode Q2, another way is grounded after passing sequentially through resistance R3 and voltage-stabiliser tube ZD1, and the anode of shielded automobile batteries is connected with USB charging chips.
Description
Technical field
The utility model is related to a kind of protection circuit modules for vehicle-mounted USB charge prepds, in particular to one kind to be used for
Protection circuit between the 5V interfaces and automobile batteries of vehicle-mounted USB.
Background technology
Usually simple vehicle-mounted USB charge prepds are all fairly simple, as long as entire scheme can be completed in a charging chip
Design, be not very stringent for protection class requirement, but some application scenarios just need to do correspondingly to handle, such as in vehicle
In electrical appliance field, when USB charge the 5V voltages of output be connected in automobile batteries 12V systems when, USB charging chips will be by
It burns and smolders, cause product that cannot work or even can also trigger the security incidents such as self-burning of vehicle.Moreover, as vehicle-mounted USB charges
Continuous popularization, currently charge on automobile very popular, especially this electronic product of mobile phone needs to be filled at any time
Electricity is to meet the needs of client's emergency.Particularly, the output port majority of USB is to be installed in central vehicle handrail this block
Position, so very convenient user carry out mobile phone charging, and the charging wire port of user is easy to encounter with the cigar lighter on automobile, many
Well known, the electrical voltage system of automobile cigarette lighter is 12V, is usually 6V left since the stress levels of charging chip in itself are very low
The right side, so, charging chip i.e. can be breakdown after USB 5V and 12V encounter together, causes irremediable consequence.Based on
Upper analysis is shorted to the protection circuit module of 12V it is therefore necessary to design a kind of USB 5V.
In view of problem above, is badly in need of one kind and is easily achieved, circuit framework is simple, stable, inexpensive in the prior art
And it can effectively avoid the 5V interfaces of USB and solution breakdown during automobile batteries short circuit.
Utility model content
The technical problems to be solved in the utility model is to provide one kind and is easily achieved, circuit framework is simple, it is stable,
5V interfaces that are inexpensive and can effectively avoiding USB and the 5V interface and vapour for vehicle-mounted USB breakdown during automobile batteries short circuit
Protection circuit between vehicle battery.
In order to solve the above technical problems, technical solution provided by the utility model is：A kind of 5V interfaces for vehicle-mounted USB
Protection circuit between automobile batteries, it includes metal-oxide-semiconductor Q1, triode Q2, resistance R1, R2, R3 and voltage-stabiliser tube ZD1；It is described
Metal-oxide-semiconductor Q1 mono- share eight pins, wherein the 5th pin, the 6th pin, the 7th pin and the 8th pin of metal-oxide-semiconductor Q1 with
The 5V voltage output ends of vehicle-mounted USB charging chips are connected；The first pin of metal-oxide-semiconductor Q1, second pin and the 3rd pin are mutual
Emitter after connection with the triode Q2 is connected, and the 4th pin of metal-oxide-semiconductor Q1 after resistance R2 by being grounded, metal-oxide-semiconductor Q1
The 4th pin simultaneously be connected with the collector of triode Q2；The base stage of the triode Q2 separates two paths of signals, a-road-through
It is connected after crossing resistance R1 with the emitter of triode Q2, another way is grounded after passing sequentially through resistance R3 and voltage-stabiliser tube ZD1, protected
The anode of automobile batteries be connected with USB charging chips；It is pressure-resistant more than 12V between DS the two poles of the earth of the metal-oxide-semiconductor Q1.
Preferably, the model of the metal-oxide-semiconductor Q1：It is pressure-resistant for 40V between DMP4013LFGQ, wherein DS the two poles of the earth；
And the encapsulation model of metal-oxide-semiconductor Q1：WDFN8.
With the above structure, the utility model has the advantages that：It includes on-off circuit, overvoltage protection electricity
Road, the on-off circuit are made of metal-oxide-semiconductor Q1, resistance R1；The overvoltage crowbar by triode Q2, resistance R1, R3,
Voltage-stabiliser tube ZD1 is formed；Usually under normal circumstances, opening state is in by metal-oxide-semiconductor Q1 and resistance R2 on-off circuits, because MOS
Pipe Q1 is P-channel metal-oxide-semiconductor, and it is to be subject to grid control to open, and grid is connected to ground by resistance, so, under normal circumstances,
Metal-oxide-semiconductor is the conducting state for being constantly in switching tube, i.e., is connected by the Vbus of metal-oxide-semiconductor Q1 drain electrode connections with metal-oxide-semiconductor Q1 source electrodes
Straight-through between Vbus_out rather than by metal-oxide-semiconductor Q1 internal diode connection.So ensure that Vbus_out is defeated
The 5V voltages gone out do not have very high pressure drop, and the pressure drop of diode is 0.6-0.7V in general metal-oxide-semiconductor body, so for being electrically charged
It is favourable for equipment, because Vbus_out is too low to cause not charging situation.
When the 5V voltages of Vbus_out outputs touch 12V system voltages, by triode Q2, resistance R1, R3, voltage-stabiliser tube
The overvoltage crowbar module of ZD1 compositions will start work, it is ensured that the 5V of USB outputs is encountered under 12V voltage conditions, is turned off
Metal-oxide-semiconductor Q1, while its internal diode can also play acting in opposition, the 12V at Vbus_out ends would not feed back to USB charging cores
The Vbus ends of piece, so as to which USB charging chips be protected not to be burned out.Its protect specific work process be：Work as Vbus_out
12V is connected to, starts to start by resistance R1, R3, voltage-stabiliser tube the ZD1 series arm formed, preferably, voltage-stabiliser tube ZD1 is selected
The voltage stabilizing value of 5.6V, the node voltage connected at this time between resistance R1 and R3 can control the base stage of triode Q2, triode Q2's
Emitter and collector turns on, and so as to control the GS of metal-oxide-semiconductor, voltage is to wait level between ensureing GS, finally turns off metal-oxide-semiconductor, complete
The over-voltage protecting function of 12V systems is shorted into USB 5V, USB charging chips is protected not to be burned out.Preferably, metal-oxide-semiconductor
It is pressure-resistant for 40V between the model DMP4013LFGQ, DS of Q1, it so ensures that when USB 5V are connected to 12V systems
More high voltage requirement.
Be easily achieved in conclusion the utility model provides one kind, circuit framework is simple, it is stable, inexpensive and
Can effectively avoid the 5V interfaces of USB and breakdown 5V interface and automobile batteries for vehicle-mounted USB during automobile batteries short circuit it
Between protection circuit.
Description of the drawings
Fig. 1 is for the schematic diagram of the protection circuit between the 5V interfaces and automobile batteries of vehicle-mounted USB in the utility model.
Specific embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings.
With reference to attached drawing 1, the protection circuit between a kind of 5V interface and automobile batteries for vehicle-mounted USB, it includes metal-oxide-semiconductor
Q1, triode Q2, resistance R1, R2, R3 and voltage-stabiliser tube ZD1；The metal-oxide-semiconductor Q1 mono- shares eight pins, wherein metal-oxide-semiconductor Q1's
5th pin, the 6th pin, the 5V voltage output ends of the 7th pin and the 8th pin with vehicle-mounted USB charging chips are connected；
The first pin of metal-oxide-semiconductor Q1, second pin are connected after being connected with each other with the 3rd pin with the emitter of the triode Q2,
The 4th pin of metal-oxide-semiconductor Q1 after resistance R2 by being grounded, and the 4th pin of metal-oxide-semiconductor Q1 is simultaneously and the collector phase of triode Q2
Even；The base stage of the triode Q2 separates two paths of signals, all the way by being connected after resistance R1 with the emitter of triode Q2, separately
It is grounded after passing sequentially through resistance R3 and voltage-stabiliser tube ZD1 all the way, the anode of shielded automobile batteries is connected with USB charging chips；
It is pressure-resistant more than 12V between DS the two poles of the earth of the metal-oxide-semiconductor Q1.
Preferably, the model of the metal-oxide-semiconductor Q1：It is pressure-resistant for 40V between DMP4013LFGQ, wherein DS the two poles of the earth；
And the encapsulation model of metal-oxide-semiconductor Q1：WDFN8.
With the above structure, the utility model has the advantages that：It includes on-off circuit, overvoltage protection electricity
Road, the on-off circuit are made of metal-oxide-semiconductor Q1, resistance R1；The overvoltage crowbar by triode Q2, resistance R1, R3,
Voltage-stabiliser tube ZD1 is formed；Usually under normal circumstances, opening state is in by metal-oxide-semiconductor Q1 and resistance R2 on-off circuits, because MOS
Pipe Q1 is P-channel metal-oxide-semiconductor, and it is to be subject to grid control to open, and grid is connected to ground by resistance, so, under normal circumstances,
Metal-oxide-semiconductor is the conducting state for being constantly in switching tube, i.e., is connected by the Vbus of metal-oxide-semiconductor Q1 drain electrode connections with metal-oxide-semiconductor Q1 source electrodes
Straight-through between Vbus_out rather than by metal-oxide-semiconductor Q1 internal diode connection.So ensure that Vbus_out is defeated
The 5V voltages gone out do not have very high pressure drop, and the pressure drop of diode is 0.6-0.7V in general metal-oxide-semiconductor body, so for being electrically charged
It is favourable for equipment, because Vbus_out is too low to cause not charging situation.
When the 5V voltages of Vbus_out outputs touch 12V system voltages, by triode Q2, resistance R1, R3, voltage-stabiliser tube
The overvoltage crowbar module of ZD1 compositions will start work, it is ensured that the 5V of USB outputs is encountered under 12V voltage conditions, is turned off
Metal-oxide-semiconductor Q1, while its internal diode can also play acting in opposition, the 12V at Vbus_out ends would not feed back to USB charging cores
The Vbus ends of piece, so as to which USB charging chips be protected not to be burned out.Its protect specific work process be：Work as Vbus_out
12V is connected to, starts to start by resistance R1, R3, voltage-stabiliser tube the ZD1 series arm formed, preferably, voltage-stabiliser tube ZD1 is selected
The voltage stabilizing value of 5.6V, the node voltage connected at this time between resistance R1 and R3 can control the base stage of triode Q2, triode Q2's
Emitter and collector turns on, and so as to control the GS of metal-oxide-semiconductor, voltage is to wait level between ensureing GS, finally turns off metal-oxide-semiconductor, complete
The over-voltage protecting function of 12V systems is shorted into USB 5V, USB charging chips is protected not to be burned out.Preferably, metal-oxide-semiconductor
It is pressure-resistant for 40V between the model DMP4013LFGQ, DS of Q1, it so ensures that when USB 5V are connected to 12V systems
More high voltage requirement.
Be easily achieved in conclusion the utility model provides one kind, circuit framework is simple, it is stable, inexpensive and
Can effectively avoid the 5V interfaces of USB and breakdown 5V interface and automobile batteries for vehicle-mounted USB during automobile batteries short circuit it
Between protection circuit.
The protection circuit module of the utility model design is applied on vehicle-mounted USB charge prepds, is to existing automobile
The useful improvement that USB charged electrical products are made has very important practical popularization significance.The output port majority of USB is
This block position of central vehicle handrail is installed in, the charging wire port of user is easy to encounter the cigar lighter on automobile, automobile point
The electrical voltage system of cigarette device is 12V voltages, and the stress levels due to charging chip in itself are very low, is usually 6V or so, once
Charging chip i.e. can be breakdown after USB 5V and 12V encounter together, causes irremediable consequence.So USB 5V are shorted to
The protection circuit module of 12V systems can play good protection, with being finally reached circuit reliably working purpose.Certainly, for it
The vehicle electronics product of its every field if such defencive function circuit of demand, can use the utility model design protection electricity
Road module.
The utility model and embodiments thereof are described above, this describe it is no restricted, it is attached shown in figure
Also it is one of embodiment of the utility model, actual structure is not limited thereto.All in all if this field it is general
Logical technical staff is enlightened by it, without deviating from the purpose of the present invention, is not inventively designed with being somebody's turn to do
The similar frame mode of technical solution and embodiment, all should belong to the protection range of the utility model.
Claims (2)
1. a kind of protection circuit between 5V interface and automobile batteries for vehicle-mounted USB, it is characterised in that：It includes metal-oxide-semiconductor
Q1, triode Q2, resistance R1, R2, R3 and voltage-stabiliser tube ZD1；The metal-oxide-semiconductor Q1 mono- shares eight pins, wherein metal-oxide-semiconductor Q1's
5th pin, the 6th pin, the 5V voltage output ends of the 7th pin and the 8th pin with vehicle-mounted USB charging chips are connected；
The first pin of metal-oxide-semiconductor Q1, second pin are connected after being connected with each other with the 3rd pin with the emitter of the triode Q2,
The 4th pin of metal-oxide-semiconductor Q1 after resistance R2 by being grounded, and the 4th pin of metal-oxide-semiconductor Q1 is simultaneously and the collector phase of triode Q2
Even；The base stage of the triode Q2 separates two paths of signals, all the way by being connected after resistance R1 with the emitter of triode Q2, separately
It is grounded after passing sequentially through resistance R3 and voltage-stabiliser tube ZD1 all the way, the anode of shielded automobile batteries is connected with USB charging chips；
It is pressure-resistant more than 12V between DS the two poles of the earth of the metal-oxide-semiconductor Q1.
2. the protection circuit between the 5V interface and automobile batteries according to claim 1 for vehicle-mounted USB, feature exist
In：The model of the metal-oxide-semiconductor Q1：It is pressure-resistant for 40V between DMP4013LFGQ, wherein DS the two poles of the earth；And the envelope of metal-oxide-semiconductor Q1
Fill model：WDFN8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721695652.7U CN207459714U (en) | 2017-12-08 | 2017-12-08 | For the protection circuit between the 5V interfaces and automobile batteries of vehicle-mounted USB |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721695652.7U CN207459714U (en) | 2017-12-08 | 2017-12-08 | For the protection circuit between the 5V interfaces and automobile batteries of vehicle-mounted USB |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207459714U true CN207459714U (en) | 2018-06-05 |
Family
ID=62276519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721695652.7U Active CN207459714U (en) | 2017-12-08 | 2017-12-08 | For the protection circuit between the 5V interfaces and automobile batteries of vehicle-mounted USB |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207459714U (en) |
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2017
- 2017-12-08 CN CN201721695652.7U patent/CN207459714U/en active Active
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