CN108363476A - The USB device protection circuit and circuit system and electronic equipment that system electrification starts - Google Patents
The USB device protection circuit and circuit system and electronic equipment that system electrification starts Download PDFInfo
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- CN108363476A CN108363476A CN201810099778.0A CN201810099778A CN108363476A CN 108363476 A CN108363476 A CN 108363476A CN 201810099778 A CN201810099778 A CN 201810099778A CN 108363476 A CN108363476 A CN 108363476A
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- Prior art keywords
- circuit
- usb
- switch
- switch pipe
- output end
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/266—Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/30—Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
Abstract
The invention belongs to electroporation fields, more particularly to the USB device that a kind of system electrification starts protects circuit and circuit system and electronic equipment, circuit includes the isolation protective circuit being connected with the feeder ear of USB interface bus and the control circuit that is connected with the enabled pin of isolation protective circuit, the control circuit includes the logic circuit at least two input terminals and an output end, the output end of the logic circuit is connected to enabled pin, two input terminals are connected to the USB enable signals output end of master controller and the switch control signal output end of system makes the circuit only when the USB enable signals from master controller and the switch control signal from system while while meeting the requirements could activate enabled pin.The present invention has many advantages, such as that external equipment can be protected while can ensure that system normally starts.
Description
Technical field
Circuit is protected the invention belongs to the USB device that electroporation field more particularly to a kind of system electrification start and is
System circuit and electronic equipment.
Background technology
The consumer electronics product that people use, it will usually use USB (universal serial bus；Equipment, especially personal electricity
Brain, Intelligent routing, intelligent TV set, set-top box, speaker, hand-portable audio ＆ video equipment etc., most of before-mentioned products have USB
Interface, in order to be compatible with different equipment, it is necessary to the measures of properly protecting in circuit design, to cope with the feelings such as short circuit, overvoltage, overcurrent
Condition.Due to the switch in the prior art directly using common metal-oxide-semiconductor as USB power supply circuits, power supply circuit can not be provided
Any protection be easy to cause output current overcurrent or interface overheat once there are the excessive equal unusual conditions of short-circuit or external load,
Serious damage is caused to USB interface and external equipment.In addition existing USB power supply circuits do not have to the above-mentioned event of host report yet
The function of barrier.
In order to solve the above-mentioned technical problem, people have carried out long-term exploration, such as it has been proposed that system 5V power supplys is defeated
Enter to one the Switch switch chips with short-circuit protection, current-limiting protection function, is opened or closed by enabled foot, then export
To the 5V power supplies of USB interface, once electric current is excessive or short-circuit in this way, USB interface power supply is just only isolated, has not interfered with
System 5V power supplies, system can also continue to work normally.
Such as Patent discloses a kind of USB power supply protection circuits and the television set [application number using the circuit again：
CN200920024522.X], including master chip MCU, power supply and USB interface, the USB power supply protection circuits further include
One power supply protection switchs, the input terminal IN connection power supplies of the power supply protection switch, output end OUT connection USB interfaces
Power pins start port EN and feedback port OC and are separately connected master chip MCU；The power supply protection switch is in its output current
It is switched to constant current limliting output state when beyond predetermined value, output current is limited on a safety value.
Above-mentioned way is in the protection that when main system has worked normally, can effectively meet USB power supplies, but if main system
In electrifying startup, and USB interface carry equipment at this time, it is possible to it will appear two kinds of problems：
1. as shown in Figure 1, generally by master chip GPIO, (universal input exports enabled control foot；Mouth control, system electrification mistake
Journey, GPIO have of short duration uncontrolled state, if USB power source opening can just be enabled, USB is also possible to of short duration
Power supply, but with system starting process, it is possible to USB 5V power supplys can be closed at once, which can cause USB device that can follow
Short time power on and off especially be easy to cause damage to mechanical hard disk etc. with electric mechanical equipment.
2.USB equipment, such as mechanical hard disk USB device are averaged when pulse current power consumption being needed to work than usual when powering on
Electric current is about twice, and system electrification similarly has big charging and powers on electric current at this time, and the two collective effect is possible to exceed
System power supply design margin, it is unsuccessful to be easy to cause system electrification.
Therefore, it is necessary to develop one, application is simple, cost is relatively low, USB mistakes can be avoided to power in system electrification
Driving circuit.
Invention content
Regarding the issue above, the present invention provides one kind is simple in structure, can avoid USB wrong in system electrification
The USB device that accidentally system electrification of power supply starts protects circuit；
The another object of this programme is to provide a kind of system electricity of the USB device protection circuit started using system electrification
Road；
The another object of this programme be to provide it is a kind of started using system electrification USB device protection circuit electronics set
It is standby.
In order to achieve the above objectives, present invention employs following technical proposals：
The USB device that the system electrification of the present invention starts protects circuit, includes being connected with the feeder ear of USB interface bus
Isolation protective circuit and the control circuit being connected with the enabled pin of isolation protective circuit, the control circuit include having extremely
The logic circuit of few two input terminals and an output end, the output end of the logic circuit are connected to enabled pin, two
Input terminal, which is connected to the USB enable signals output end of master controller and the switch control signal output end of system, makes the circuit
It could only be activated when the USB enable signals from master controller and the switch control signal from system are met the requirements simultaneously
Enabled pin.
Through the above technical solutions, the USB enable signals of single master controller or the switch control signal of system meet
It is required that cannot enable pin activation can not, so as to effectively avoid bringing USB peripheral device of short duration unstable confession
Electricity.
In the USB device protection circuit that above-mentioned system electrification starts, the isolation protective circuit includes having to make
Can pin, output pin, power pins, pin and over-current signal output pin switch chip, the output pin connect
It is connected to the feeder ear of USB interface bus, the power pins are connected to the USB feeder ears of system, and the ground pin connects ginseng
Ground is examined, the over-current signal output pin is connected to the overcurrent protection feedback end of master controller.
In the USB device protection circuit that above-mentioned system electrification starts, the switch chip is with short-circuit protection
With the AP2171 devices for crossing flow path protective effect.
Through the above technical solutions, make circuit while having the function of short-circuit protection and overcurrent protection.
In the USB device protection circuit that above-mentioned system electrification starts, the logic circuit includes being connected with each other
The control terminal of first switch pipe and second switch pipe, the first switch pipe is connected to the output end of second switch pipe, and first opens
The input terminal for closing pipe is connected to the USB enable signal output ends of master controller, and the output end of first switch pipe is connected to switch core
The enabled pin of piece, the input terminal of second switch pipe are connected with the switch control signal output end of system.The switch of system controls
Signal control second switch pipe opens or closes, and second switch pipe controls opening or closing for first switch pipe, master control
The USB enable signals of device processed need the opening of second switch pipe that can just be output to enabled pin again, to need the switch of system
The USB enable signal output ends output that control signal meets the requirement and master controller of opening first switch pipe has main control
The USB enable signals of device could export switch chip enable signal to which activation enables pin in the output end of second switch pipe.
In the USB device protection circuit that above-mentioned system electrification starts, the first switch pipe and second switch pipe
Between be also associated with divider resistance；The output end of the first switch pipe is connected with the first electricity with the common end of enabled pin
Hold, another termination reference ground of first capacitance；Between the switch control signal output end of the second switch pipe and system
It is serially connected with series resistance.
In the USB device protection circuit that above-mentioned system electrification starts, the second switch pipe is NPN triode,
The base stage of NPN triode is connected to series resistance, and the other end of series resistance is connected to the switch control signal output end of system,
Emitter connects reference ground, and collector is connected to divider resistance.
In the USB device protection circuit that above-mentioned system electrification starts, the divider resistance includes the first partial pressure electricity
Resistance and the second divider resistance, the first switch pipe are enhanced metal-oxide-semiconductor, and the both ends of first divider resistance connect respectively
It is connected to the source electrode of the grid and first switch pipe of first switch pipe, the both ends of the second divider resistance are connected to first switch pipe
Grid and second switch pipe collector, the drain electrode of first switch pipe is connected to enabled pin.
In the USB device protection circuit that above-mentioned system electrification starts, the switch control signal output end of the system
It is connected with reserved resistance and the second capacitance parallel with one another with the common end of series resistance.
A kind of circuit system comprising the USB device protection that the system electrification described in claim 1-8 any one starts
Circuit.
A kind of electronic equipment comprising the USB device protection that the system electrification described in claim 1-8 any one starts
Circuit.
The present invention has the following advantages compared to the prior art：Circuit structure is simple, and protecting effect is good；Make circuit upper
The power supply of USB mistakes will not occur in electric process, have many advantages, such as that USB device can be protected, improve system stability.
Description of the drawings
Fig. 1 is the power supply timing figure of the prior art；
Fig. 2 is circuit diagram of the present invention；
Fig. 3 is the inside functional block diagram of switch chip of the present invention；
Fig. 4 is the power supply timing figure of the present invention；
Fig. 5 is the oscillogram of circuit of the present invention.
Reference numeral：The USB enable signal output ends USB_PWR_EN of master controller；The switch control signal of system exports
Hold ENABLE_CONTROL；Switch chip enable signal USB_SWITCH_EN；The feeder ear USB_5V of USB interface bus；System
USB feeder ears SYS_5V；Link in tandem 1；Control link 2；USB power supply links 3；First switch pipe Q1；Grid G；Source S；
Drain D；Second switch pipe Q2；Base stage B；Collector C；Emitter E；First divider resistance R1；Second divider resistance R2；First electricity
Hold C2；Second capacitance C1；Reserved resistance R4；Series resistance R3；Third capacitance C3；4th capacitance C4；5th capacitance C5；Switch core
Piece U1；Enabled pin EN；Power pins IN；Output pin OUT；Ground pin GND；Over-current signal output pin
Specific implementation mode
Term "and/or" used herein above includes the arbitrary and institute of the associated item listed by one of them or more
There is combination.When a unit is referred to as " connecting " or when " coupled " to another unit, can be connected or coupled to described
Another unit, or may exist temporary location.
Term used herein above is not intended to limit exemplary embodiment just for the sake of description specific embodiment.Unless
Context clearly refers else, otherwise singulative used herein above "one", " one " also attempt to include plural number.Also answer
When understanding, term " include " and or " include " used herein above provide stated feature, integer, step, operation,
The presence of unit and/or component, and do not preclude the presence or addition of other one or more features, integer, step, operation, unit,
Component and/or a combination thereof.
The USB device protection circuit and circuit system and electronic equipment that the system electrification of the present invention starts are mainly used in electricity
Field is protected on road, solves in the prior art that USB protective values are inadequate, be easy to cause the damage of USB device and to reduce system steady
The problems such as qualitative, is the preferred embodiment of the present invention and in conjunction with attached drawing below, is further retouched to technical scheme of the present invention work
It states, but the present invention is not limited to these Examples.
As shown in Fig. 2, the USB device protection circuit that the system electrification of the present embodiment starts includes and USB interface bus
Isolation protective circuit connected feeder ear USB_5V and the control circuit being connected with the enabled pin EN of isolation protective circuit, isolation
Protection circuit includes switch chip U1, and control circuit includes the logic circuit at least two input terminals and an output end,
The output end of logic circuit is connected to enabled pin EN, and the USB enable signals that two input terminals are connected to master controller are defeated
The outlet USB_PWR_EN and switch control signal output end ENABLE_CONTROL of system makes the circuit only when from master control
The USB enable signals of device processed and the switch control signal from system could activate enabled pin EN when meeting the requirements simultaneously.
Further, logic circuit includes the first switch pipe Q1 being connected with each other and second switch pipe Q2, first switch pipe
The control terminal of Q1 is connected to the output end of second switch pipe Q2, and the input terminal of first switch pipe Q1 is connected to the USB of master controller
The output end of enable signal output end USB_PWR_EN, first switch pipe Q1 are connected to the enabled pin EN of switch chip U1, the
The input terminal of two switching tube Q2 is connected with the switch control signal output end ENABLE_CONTROL of system, passes through above-mentioned connection side
Formula, the switch control signal control second switch pipe Q2's of system opens or closes, and second switch pipe Q2 controls first are opened
Opening or closing for pipe Q1 is closed, the USB enable signals of master controller need the opening of second switch pipe Q2 that can just be output to again to be made
Can pin EN, to need the switch control signal of system to meet open the requirement of first switch pipe Q1, while master controller
The USB_PWR_EN outputs of USB enable signal output ends have the USB enable signals of master controller could be in the defeated of second switch pipe Q2
Outlet exports switch chip enable signal USB_SWITCH_EN to which activation enables pin EN with the power supply to USB interface bus
Hold USB_5V power supplies.
Specifically, divider resistance is connected between first switch pipe Q1 and second switch pipe Q2, first switch pipe Q1 uses P
Channel enhancement metal-oxide-semiconductor constitutes link in tandem 1, and second switch pipe Q2 uses NPN triode, two input terminals point of logic circuit
Do not refer to the source S of metal-oxide-semiconductor and the base stage B of NPN triode, an output end refers to the drain D of metal-oxide-semiconductor, and the logic of the present embodiment
Circuit be and logic circuit be used for the USB enable signals of autonomous control device in future and switch control signal from system into
Row and output after logic control to enabled pin.Similarly, the control terminal of first switch pipe Q1, input terminal and output end respectively refer to
Grid G, source S and the drain D of metal-oxide-semiconductor, output end, the input terminal of second switch pipe Q2 respectively refer to the collector C of NPN triode
With base stage B.
Divider resistance, NPN triode and with the concatenated series resistance R3 of base stage B of NPN triode and and series resistance
The concatenated switch control signals for controlling the system of NPN triode conducting state of R3 constitute the control of P-channel enhancement type metal-oxide-semiconductor
Link 2 processed.
And the divider resistance includes the first divider resistance R1 and the second divider resistance R2, the first divider resistance R1 and second point
The resistance value size of piezoresistance R2 can select 10K ohm and 1K ohm respectively.
First divider resistance R1 is connected across in P-channel enhancement type metal-oxide-semiconductor grid G and source S, the second divider resistance R2 connections
Between the grid G of P-channel enhancement type metal-oxide-semiconductor and the collector C of NPN triode, the drain D of P-channel enhancement type metal-oxide-semiconductor connects
Reference ground is connect in the emitter E of the enabled pin EN of isolation protective circuit, NPN triode, the switch control of base stage B and system is believed
It number is connected by series resistance R3.
P-channel enhancement type metal-oxide-semiconductor, metal (metal)-oxide (the oxide)-field semiconductor (semiconductor) effect
Transistor is answered, output current Id is controlled using input voltage Vgs, as Vgs=0, which is in cut-off state, when Vgs's
After voltage difference reaches cut-in voltage, which is in conducting state, belongs to high-side driver device.
The switch chip enable signal USB_SWITCH_ENUSB_SWITCH_ of the drain D output of P-channel enhancement type metal-oxide-semiconductor
EN and isolation protective circuit constitute actual USB power supplies link 3.
NPN type triode is made of three block semiconductors, wherein two pieces of N-types and one piece of P-type semiconductor composition, P-type semiconductor
In centre, for two pieces of N-type semiconductors in both sides, it is a kind of control element, is mainly used to control the size of electric current, with common emitter
For E connections (signal is inputted from base stage B, is exported from collector C, and emitter E connects reference ground), when there are one base stage B voltages UB
When small variation, base stage B electric currents IB can also have a small variation therewith, be controlled by base stage B electric currents IB, collector C electric currents
IC can be there are one prodigious variation, and base stage B electric currents IB is bigger, and collector C electric currents IC is also bigger, conversely, base stage B electric currents are smaller,
Collector C electric currents are also smaller, i.e. the variation of base stage B current controls collector C electric currents, tend to lead when base stage B input voltages increase
It is logical, cut-off is tended to when base stage B input voltages reduce, the switch control signal of system can select to give tacit consent to the GPIO letters of internal drop-down
Number, or systematic reset signal, in electrifying startup, the switch control signal output of system is low level, is at this moment passed through
The base stage B- emitter E pressure differences for crossing NPN triode are insufficient to allow the NPN triode to be connected, and are off cut-off state, at this time
Control link 2 is to disconnect, and without electric current, does not have voltage difference between the first divider resistance R1 and the second divider resistance R2, so P
The Vgs of channel enhancement metal-oxide-semiconductor can not be allowed to be connected, at this moment, even if the USB enable signals from master controller are
High level, P-channel enhancement type metal-oxide-semiconductor can not also export the switch chip enable signal USB_SWITCH_ that activation enables pin EN
EN；After system take over work, the switch control signal from system is opened for high level, at this time switch chip enable signal
USB_SWITCH_EN follows the USB enable signals of master controller, and the USB enable signals of master controller are in high level at this time, warp
After crossing the first divider resistance R1 and the second divider resistance R2 partial pressures, Vgs pressure differences are about -3V, meet P-channel enhancement type MOS
The threshold value of pipe, link in tandem 1 can be connected, and then switch chip enable signal USB_SWITCH_EN and then becomes high level,
Enabled switch chip U1 opens USB power supply links 3, and the feeder ear USB_5V of USB interface bus has 5V power supplies at this time.
Preferably, the switch control signal output end ENABLE_CONTROL of system is connect with the common end of series resistance R3
There are reserved resistance R4 and the second capacitance C1 parallel with one another, the resistance value for reserving resistance R4 selects 1K ohm of size, the second capacitance
The size of C1 is 100nF.
Specifically, the switch chip U1 of the present embodiment is with short-circuit protection and the AP2171 devices for crossing flow path protective effect
Part, AP2171 devices have enabled pin EN, output pin OUT, power pins IN, pin GND and over-current signal output draw
FootSwitch chip U1, wherein output pin OUT is connected to the feeder ear USB_5V of USB interface bus, and the present embodiment
Be also associated between middle output pin OUT and the feeder ear USB_5V of USB interface bus other end ground connection third capacitance C3, the
Four capacitance C4 and the 5th capacitance C5, and, the size of third capacitance C3 is 220uF, and the size of the 4th capacitance C4 is 100nF, the 5th
The size of capacitance C5 is 1uF.
The power pins IN of AP2171 devices is connected to the USB feeder ears SYS_5V of system to provide 5V power supplys for chip,
Ground pin GND connects reference ground, over-current signal output pinIt is connected to the overcurrent protection feedback end of master controller, works as electric current
When excessive or short-circuit, can situation be reflected to master controller in time so that USB interface bus feeder ear USB_5V
Isolation enables a system to out of order in the feeder ear USB_5V of USB interface bus to accomplish not influence the 5V power supplies of system
Continue to work normally simultaneously.
Specifically, Fig. 3 is the internal circuit functional block diagram of AP2171 devices, as switch chip enable signal USB_
When SWITCH_EN is high level, enabled pin EN is activated, which starts to work, power pins IN and output pin OUT electricity
Source is connected.
Further, the output end of P-channel enhancement type metal-oxide-semiconductor and the common end of enabled pin EN are connected with the first capacitance
The first capacitance C2 sizes of C2, another termination reference ground of first capacitance C2, and the present embodiment are 100nF.
The present embodiment by using P-channel enhancement type metal-oxide-semiconductor as first switch pipe Q1, as second open by NPN triode
Pipe Q2 is closed, the conducting off state of the switch control signal control NPN triode from system, and the output of NPN triode is believed
The conducting and shutdown for number controlling P-channel enhancement type metal-oxide-semiconductor again, have following two when with USB enable signals from controller
Kind situation：When the output of the switch control signal of system is low level, NPN triode is in cut-off state, and collector C does not have
Output makes metal-oxide-semiconductor be in cut-off state so the voltage difference between source S and grid G is 0, and it is enabled can not to export switch chip
Signal USB_SWITCH_EN, to which enabled pin EN can not be activated；And when the output of the switch control signal of system is high level
When, NPN triode is in the conduction state, and collector C has output, and the Vgs pressure differences of P-channel enhancement type metal-oxide-semiconductor are about at this time
For -3V, meet turn-on condition, drain D exports the USB_SWITCH_EN activation of switch chip enable signal and enables pin EN, also
Being activation switch chip U1 keeps switch chip U1 in running order to start to supply to the feeder ear USB_5V of USB interface bus
Electricity.From here it is recognised that the present embodiment is using the method with logic, that is, only when the switch control signal of system
High level is exported, the USB enable signals of master controller also export high level, and can just be exported in drain D can activate enabled pin
The switch chip enable signal USB_SWITCH_EN of EN reaches the influence for eliminating electrifying startup jitter state.
As shown in figure 4, being described in detail below with sequence diagram, the USB enable signal output ends of master controller
The output level of USB_PWR_EN can be of short duration it is uncontrolled, although there is of short duration 20ms high level at moment A, due to
The switch control signal output end ENABLE_CONTROL output of system is still low level, by with after logic, output
Switch chip enable signal USB_SWITCH_EN still remains low level, and the feeder ear USB_5V of USB interface bus does not occur
Of short duration powers on.
The switch control signal output end ENABLE_CONTROL of B at the time of system begins to take over work, system are opened
For high level, at this moment switch chip enable signal USB_SWITCH_EN follows the USB enable signal output ends USB_ of master controller
The output signal of PWR_EN, you can pass through the feeder ear USB_ of the USB enable signal normal control USB interface buses of master controller
5V。
The present embodiment has carried out experimental verification to above-mentioned circuit structure, the portion waveshape figure of verification result as shown in figure 5,
The figure shows that the oscillogram of verification result unanimously disclosure satisfy that the challenging needs of user with expected, can stablize reach system
Afterwards, then by system control USB power supplies are taken over, reduces the implicit damage of external equipment and ensure that the normal startup of system.
In addition, the present embodiment also discloses a kind of circuit system and a kind of electronic equipment, circuit system and electronic equipment are equal
Circuit is protected including the USB device that the system electrification described in the present embodiment starts, wherein circuit system can be host computer electricity
Road, intelligent TV set control circuit etc., electronic equipment can be mobile phone charging head, mobile terminal etc..
Certainly the first switch pipe Q1 and second switch pipe Q2 of the present invention is not limited to the triode described in embodiment or MOS
Pipe, other disclosure satisfy that the device alternative triode or metal-oxide-semiconductor here of switch control logic, it should be noted that herein
Described in specific embodiments are merely illustrative of the spirit of the present invention.Those skilled in the art
It can make various modifications or additions to the described embodiments or substitute by a similar method, but can't be inclined
Spirit or beyond the scope defined by the appended claims from the present invention.
Although the USB enable signal output ends USB_PWR_EN of master controller is used more herein；The switch of system
Control signal output ENABLE_CONTROL；Switch chip enable signal USB_SWITCH_EN；The power supply of USB interface bus
Hold USB_5V；The USB feeder ears SYS_5V of system；Link in tandem 1；Control link 2；USB power supply links 3；First switch pipe Q1；
Grid G；Source S；Drain D；Second switch pipe Q2；Base stage B；Collector C；Emitter E；First divider resistance R1；Second partial pressure
Resistance R2；First capacitance C2；Second capacitance C1；Reserved resistance R4；Series resistance R3；Third capacitance C3；4th capacitance C4；5th
Capacitance C5；Switch chip U1；Enabled pin EN；Power pins IN；Output pin OUT；Ground pin GND；Over-current signal output is drawn
FootEqual terms, but it does not preclude the possibility of using other terms.The use of these items is only for more easily retouch
State and explain the essence of the present invention；Any one of the additional limitations is construed as all to disagree with spirit of that invention.
Claims (10)
- Include that guarantor is isolated with what the feeder ear of USB interface bus was connected 1. the USB device that a kind of system electrification starts protects circuit Protection circuit and the control circuit being connected with the enabled pin of isolation protective circuit, which is characterized in that the control circuit includes The output end of logic circuit at least two input terminals and an output end, the logic circuit is connected to enabled draw Foot, two input terminals are connected to the USB enable signals output end of master controller and the switch control signal output end of system Make the circuit only when the USB enable signals from master controller and the switch control signal from system while when meeting the requirements Enabled pin could be activated.
- 2. the USB device of system according to claim 1 electrifying startup protects circuit, which is characterized in that the isolation Protection circuit include with enabled pin, output pin, power pins, pin and over-current signal output pin switch core Piece, the output pin are connected to the feeder ear of USB interface bus, and the power pins are connected to the USB power supplies of system End, the ground pin connect reference ground, and the over-current signal output pin is connected to the overcurrent protection feedback end of master controller.
- 3. the USB device that system electrification according to claim 2 starts protects circuit, which is characterized in that the switch Chip is with short-circuit protection and the AP2171 devices for crossing flow path protective effect.
- 4. the USB device that the system electrification according to claim 1-3 any one starts protects circuit, which is characterized in that The logic circuit includes the first switch pipe being connected with each other and second switch pipe, the control terminal connection of the first switch pipe In the output end of second switch pipe, the input terminal of first switch pipe is connected to the USB enable signal output ends of master controller, and first The output end of switching tube is connected to the enabled pin of switch chip, the input terminal of second switch pipe and the switch control signal of system Output end is connected.
- 5. the USB device that system electrification according to claim 4 starts protects circuit, which is characterized in that described first It is also associated with divider resistance between switching tube and second switch pipe；The public affairs of the output end and enabled pin of the first switch pipe End is connected with the first capacitance altogether, another termination reference ground of first capacitance；The switch control of second switch pipe and the system It is serially connected with series resistance between signal output end processed.
- 6. the USB device that system electrification according to claim 5 starts protects circuit, which is characterized in that described second Switching tube is NPN triode, and the base stage of NPN triode is connected to series resistance, and the other end of series resistance is connected to system Switch control signal output end, emitter connect reference ground, and collector is connected to divider resistance.
- 7. the USB device that system electrification according to claim 6 starts protects circuit, which is characterized in that the partial pressure Resistance include the first divider resistance and the second divider resistance, the first switch pipe be enhanced metal-oxide-semiconductor, described first point The both ends of piezoresistance are connected to the source electrode of the grid and first switch pipe of first switch pipe, the both ends point of the second divider resistance It is not connected to the collector of the grid and second switch pipe of first switch pipe, the drain electrode of first switch pipe is connected to enabled pin.
- 8. the USB device that system electrification according to claim 7 starts protects circuit, which is characterized in that the system The common end of switch control signal output end and series resistance is connected with reserved resistance and the second capacitance parallel with one another.
- 9. a kind of circuit system, which is characterized in that the USB started including the system electrification described in claim 1-8 any one Equipment protection circuit.
- 10. a kind of electronic equipment, which is characterized in that the USB started including the system electrification described in claim 1-8 any one Equipment protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810099778.0A CN108363476A (en) | 2018-02-01 | 2018-02-01 | The USB device protection circuit and circuit system and electronic equipment that system electrification starts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810099778.0A CN108363476A (en) | 2018-02-01 | 2018-02-01 | The USB device protection circuit and circuit system and electronic equipment that system electrification starts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108363476A true CN108363476A (en) | 2018-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810099778.0A Pending CN108363476A (en) | 2018-02-01 | 2018-02-01 | The USB device protection circuit and circuit system and electronic equipment that system electrification starts |
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| CN110389552A (en) * | 2019-07-25 | 2019-10-29 | 中国科学院西安光学精密机械研究所 | A kind of calibration that can eliminate risk and power control circuit |
| CN110858711A (en) * | 2018-08-22 | 2020-03-03 | 三星电子株式会社 | Circuit and method for overvoltage protection in a universal serial bus interface |
| CN112701899A (en) * | 2020-12-11 | 2021-04-23 | 京东数科海益信息科技有限公司 | Main controller starting circuit and method and electronic equipment |
| CN113347011A (en) * | 2021-04-20 | 2021-09-03 | 深圳市广和通无线股份有限公司 | Communication device, system and communication method |
| CN114371645A (en) * | 2021-12-10 | 2022-04-19 | 深圳市联洲国际技术有限公司 | Control circuit and device |
| CN116028395A (en) * | 2022-06-07 | 2023-04-28 | 荣耀终端有限公司 | Control circuit, electronic device, hardware security protection method and storage medium |
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| CN110858711A (en) * | 2018-08-22 | 2020-03-03 | 三星电子株式会社 | Circuit and method for overvoltage protection in a universal serial bus interface |
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| CN116028395B (en) * | 2022-06-07 | 2024-03-08 | 荣耀终端有限公司 | Control circuit, electronic device, hardware security protection method and storage medium |
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