CN107276037A - Vehicle-mounted USB power source interface protective circuit - Google Patents
Vehicle-mounted USB power source interface protective circuit Download PDFInfo
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- CN107276037A CN107276037A CN201710544549.0A CN201710544549A CN107276037A CN 107276037 A CN107276037 A CN 107276037A CN 201710544549 A CN201710544549 A CN 201710544549A CN 107276037 A CN107276037 A CN 107276037A
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- Prior art keywords
- electronic switch
- vehicle
- power source
- output end
- usb power
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention discloses a kind of vehicle-mounted USB power source interface protective circuit; the protection circuit includes being used to connect the power input of vehicle-mounted USB power source and for connecting the power output end of electrical equipment, being sequentially connected in series the first electronic switch and the second electronic switch that are arranged between power input and power output end; and switching clamper and delay circuit; the test side of switching clamper and the input of delay circuit are connected with power output end respectively, and the control end of switching clamper is connected with the controlled end of the first electronic switch；The output end of delay circuit is connected with the controlled end of the second electronic switch；Switching clamper clamps down on the shut-off of the first electronic switch during the voltage that delay circuit detects power output end reaches the voltage protection threshold value of vehicle-mounted USB power source and carries out delays time to control to the conducting of the second electronic switch.The problem of voltage that the present invention solves on-vehicle battery pours in down a chimney to through USB interface and damages component in vehicle-mounted USB power source.
Description
Technical field
The present invention relates to electronic circuit technology field, more particularly to a kind of vehicle-mounted USB power source interface protective circuit.
Background technology
In the automobile product with USB functions, vehicle-mounted USB power source can be by USB port to mobile device such as mobile phone, flat
Plate computer etc. provides 5V charging voltage, but USB port may accidental cause, such as automobile of the voltage in the range of 9V-16V
Battery touches USB interface, and causes access USB interface to be higher than the voltage of vehicle-mounted USB power source voltage protection threshold value, this high pressure
If being poured in down a chimney by USB interface to vehicle-mounted USB power source, vehicle-mounted USB power source will be caused can not to bear this high pressure and vehicle-mounted USB electricity is burnt out
Component in source.
The content of the invention
The main object of the present invention is to propose a kind of vehicle-mounted USB power source interface protective circuit, it is intended to solves on-vehicle battery and exists
When touching USB power source interface, the voltage of on-vehicle battery pours in down a chimney to through USB interface and damages component in vehicle-mounted USB power source
Problem.
To achieve the above object, a kind of vehicle-mounted USB power source interface protective circuit proposed by the present invention, the vehicle-mounted USB electricity
Source interface protection circuit includes the power input for connecting vehicle-mounted USB power source and exported for the power supply for connecting electrical equipment
Hold, be sequentially connected in series the first electronic switch and the second electronic cutting being arranged between the power input and the power output end
The input of pass, and switching clamper and delay circuit, the test side of the switching clamper and the delay circuit
It is connected respectively with the power output end, the control end of the switching clamper and the controlled end of first electronic switch connect
Connect；The output end of the delay circuit is connected with the controlled end of second electronic switch；Wherein,
First electronic switch and the second electronic switch, during for turning at the same time, the vehicle-mounted USB power source is exported
To the power output end, during shut-off one of wherein, cut off the vehicle-mounted USB power source and export to the power output end；
It is under off state, the switching clamper, uses in first electronic switch and the second electronic switch
Reach the voltage protection threshold value of the vehicle-mounted USB power source in the voltage that the power output end is detected in the delay circuit and
During carrying out delays time to control to the conducting of second electronic switch, output clamp signal clamps down on residence and states the first electronic switch
Off state.
Preferably, the switching clamper includes the 3rd electronic switch, first resistor, second resistance, the first voltage-stabiliser tube
And first electric capacity, the input of the 3rd electronic switch is the test side of the switching clamper, the 3rd electricity
The output end of sub switch is the control end of the switching clamper, and the controlled end of the 3rd electronic switch is through the described first electricity
Resistance is connected with the negative electrode of the voltage-stabiliser tube, and the plus earth of first voltage-stabiliser tube, the second resistance is arranged in parallel in described
Between the input and controlled end of 3rd electronic switch, first electric capacity is arranged in parallel with first voltage-stabiliser tube.
Preferably, the 3rd electronic switch is PNP type triode, and the base stage of the PNP type triode is described
The controlled end of driving switch, the input of the extremely described driving switch of transmitting of the PNP type triode, the pole of positive-negative-positive three
The output end of the extremely described driving switch of the current collection of pipe.
Preferably, first electronic switch and/or the second electronic switch are the P-MOS pipes with body diode, described
The drain electrode of the first electronic switch P-MOS pipes corresponding with the input of second electronic switch, first electronic switch
The source electrode of the P-MOS pipes corresponding with the output end of second electronic switch, first electronic switch and second electricity
The grid of the controlled end correspondence P-MOS pipes of sub switch.
Preferably, the vehicle-mounted USB power source interface protective circuit also includes 3rd resistor and the 4th resistance, the 3rd electricity
Resistance is arranged in series between the controlled end and ground of first electronic switch, and the 4th resistant series are arranged at first electricity
Between the input and ground of sub switch wherein,
The resistance of 4th resistance is much smaller than the internal resistance of first electronic switch.
Preferably, the delay circuit includes the 5th resistance and the second electric capacity, and the first end of second electric capacity is described
The input of delay circuit, the second end of second electric capacity is the output end of the delay circuit, and with the 5th resistance
First end connection；The second end ground connection of 5th resistance.
Preferably, the vehicle-mounted USB power source interface protective circuit also includes the energy for being used to discharge the power output end
Discharge circuit, the input of the discharge circuit is connected with the power output end, the output of the discharge circuit.
Preferably, the discharge circuit includes the first diode and the 7th resistance, the first end of the 7th resistance and institute
The first end connection of the second electric capacity is stated, the negative electrode of first diode is connected with the second end of second electric capacity, described the
The anode of one diode is connected with the second end of the 7th resistance, and is grounded.
Preferably, the vehicle-mounted USB power source interface protective circuit also includes the 6th resistance and the second voltage-stabiliser tube, the described 6th
Resistant series are arranged between the input of second electronic switch and ground；The negative electrode of second voltage-stabiliser tube and the power supply
Input is connected, and the anode of second voltage-stabiliser tube is connected with the controlled end of second electronic switch；Wherein,
The resistance of 6th resistance is much smaller than the internal resistance of the second electronic switch.
Preferably, the vehicle-mounted USB power source interface protective circuit also include the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and
6th electric capacity, the 3rd electric capacity and the 4th electric capacity are arranged in series between the power input and ground, and the described 5th
Electric capacity and the 6th electric capacity are arranged in series between the power output end and ground.
The vehicle-mounted USB power source interface protective circuit of the present invention is examined by setting switching clamper, and in switching clamper
The voltage for measuring the power output end is triggered when reaching the voltage protection threshold value of the vehicle-mounted USB power source, and in the delay
Circuit is controlled in the presence of the second electronic switch Delayed conducting, the first electronic switch shut-off is controlled, so as to control institute
State power input and the power output end Vout disconnects electrical connection, so as to avoid the voltage of power output end from pouring in down a chimney to electricity
Source input, so that the high voltage pulse that automobile batteries is inputted is isolated with vehicle-mounted USB power source, to protect vehicle-mounted USB electricity
Source, it is ensured that its energy normal work, so that on-vehicle battery is solved when touching USB power source interface, the voltage warp of on-vehicle battery
The problem of USB interface pours in down a chimney to and damages component in vehicle-mounted USB power source.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Structure according to these accompanying drawings obtains other accompanying drawings.
Fig. 1 is the high-level schematic functional block diagram of vehicle-mounted USB power source interface protective circuit of the invention；
Fig. 2 is the electrical block diagram of the vehicle-mounted embodiment of USB power source interface protective circuit one in Fig. 1.
Drawing reference numeral explanation：
| Label | Title | Label | Title |
| 10 | Switching clamper | R1 | First resistor |
| 20 | Delay circuit | R2 | Second resistance |
| 30 | Discharge circuit | R3 | 3rd resistor |
| Q1 | First electronic switch | R4 | 4th resistance |
| Q2 | Second electronic switch | R5 | 5th resistance |
| Q3 | 3rd electronic switch | R6 | 6th resistance |
| C1 | First electric capacity | R7 | 7th resistance |
| C2 | Second electric capacity | ZD1 | First voltage-stabiliser tube |
| C3 | 3rd electric capacity | ZD2 | Second voltage-stabiliser tube |
| C4 | 4th electric capacity | D1 | First diode |
| C5 | 5th electric capacity | Vout | Power output end |
| C6 | 6th electric capacity | Vin | Power input |
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
If it is to be appreciated that related in the embodiment of the present invention directionality indicate (such as up, down, left, right, before and after ...),
Then directionality indicate to be only used for explain relative position relation under a certain particular pose (as shown in drawings) between each part,
Motion conditions etc., if the particular pose changes, directionality indicates also correspondingly therewith to change.
If in addition, relating to the description of " first ", " second " etc. in the embodiment of the present invention, being somebody's turn to do " first ", " second " etc.
Description be only used for describing purpose, and it is not intended that indicating or implying its relative importance or implicit indicate indicated skill
The quantity of art feature.Thus, " first " is defined, at least one spy can be expressed or be implicitly included to the feature of " second "
Levy.In addition, the technical scheme between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
Based on enough realizations, when the combination appearance of technical scheme is conflicting or can not realize it will be understood that the knot of this technical scheme
Conjunction is not present, also not within the protection domain of application claims.
The present invention proposes a kind of vehicle-mounted USB power source interface protective circuit.
Reference picture 1 and Fig. 2, in an embodiment of the present invention, the vehicle-mounted USB power source interface protective circuit include being used to connect
Pick up the power input Vin for carrying USB power source and be arranged at for connecting the power output end Vout of electrical equipment, being sequentially connected in series
The first electronic switch Q1 and the second electronic switch Q2 between the power input Vin and the power output end Vout, with
And switching clamper 10 and delay circuit.The test side of the switching clamper 10 and the input difference of delay circuit 20
It is connected with the power output end Vout, the control end of the switching clamper 10 is controlled with the first electronic switch Q1's
End connection；The output end of the delay circuit 20 is connected with the controlled end of the second electronic switch Q2.
Wherein, the first electronic switch Q1 and the second electronic switch Q2 is used to, in conducting, control the power input
Vin and power output end Vout electrical connections are held, the supply voltage of the vehicle-mounted USB power source is exported to the power supply
Output end vo ut.
In the present embodiment, the first electronic switch Q1 and/or the second electronic switch Q2 are the P-MOS with body diode
Pipe, the drain electrode of the first electronic switch Q1 P-MOS pipes corresponding with the input of the second electronic switch Q2, described the
The source electrode of the one electronic switch Q1 P-MOS pipes corresponding with the output end of the second electronic switch Q2, first electronic cutting
Close the grid of the Q1 P-MOS pipes corresponding with the controlled end of the second electronic switch Q2.In the present embodiment, P-MOS pipes are preferred
Managed for AO3401 types P-MOS.Body diode is used to prevent that the voltage in power output end Vout from inputting more than power input Vin
Vehicle-mounted USB power source voltage when, the high voltage pours in down a chimney to vehicle-mounted USB power source through body diode.
The voltage that vehicle-mounted USB power source is typically exported is 5V, thinks electrical equipment, the mobile electricity such as mobile phone, tablet personal computer
Sub- equipment provides supply voltage, and in the first electronic switch Q1 of vehicle-mounted USB power source interface protective circuit and the second electronic switch
Q2 is both turned on, so that when controlling power input Vin and power output end Vout electrical connections, by USB port to mobile electricity
Sub- equipment is charged.
It is in the first electronic switch Q1 and the second electronic switch Q2 under off state, the switching clamper
10, the voltage for detecting the power output end in the delay circuit 20 reaches that the voltage of the vehicle-mounted USB power source is protected
Protect threshold value and during carrying out delays time to control to the conducting of the second electronic switch Q2, output clamp signal clamps down on residence and states first
Electronic switch Q1 off state.
Wherein, delay circuit 20 is not up to the voltage protection threshold value of the vehicle-mounted USB power source in the voltage of power output end
When do not work, now the second electronic switch Q2 normallies, and being reached in the voltage for detecting the power output end described vehicle-mounted
During the voltage protection threshold value of USB power source, the second electronic switch Q2 Delayed conductings are controlled.
Switching clamper 10 is used to reach the vehicle-mounted USB power source in the voltage for detecting the power output end Vout
Triggered during voltage protection threshold value, and during the delay circuit 20 controls the second electronic switch Q2 Delayed conductings, control
The first electronic switch Q1 shut-offs, so that it is electric to control the power input Vin and power output end Vout to disconnect
Connection.Now due to the time-lag action of delay circuit 20, time-lag action knot of the meeting of switching clamper 10 prior to delay circuit 20
Shu Qian, carries out clamper so that the first electronic switch Q1 can not be turned on, and be off shape by the first electronic switch Q1 controlled end
State.
Specifically, when the switching clamper 10 in the voltage for detecting the power output end Vout is not up to the car
Closed during the voltage protection threshold value for carrying USB power source, namely power output end Vout is not when having the high voltage to pour in down a chimney, and now switchs clamper
Circuit 10 and delay circuit 20 do not work, the first electronic switch Q1 and the second electronic switch Q2 conductings, to control power input
Vin and power output end Vout electrical connections are held, vehicle-mounted USB power source interface protective circuit normally exports vehicle-mounted USB power source voltage,
So that electrical equipment of the vehicle-mounted USB power source voltage output that power input Vin is accessed to power output end Vout connections.
When switching clamper 10 reaches the electricity of the vehicle-mounted USB power source in the voltage for detecting the power output end Vout
Triggered during pressure rotection thresholds, while delay circuit 20 controls the second electronic switch Q2 Delayed conductings, now due to delay circuit 20
Time-lag action, switching clamper 10 can prior to delay circuit 20 time-lag action terminate before, by the first electronic switch Q1's
Controlled end carries out clamper so that the first electronic switch Q1 can not be turned on, and be off state, so as to control the power input
The Vin and power output end Vout is held to disconnect electrical connection, so as to avoid power output end Vout voltage from pouring in down a chimney to power supply
Input, and burn vehicle-mounted USB power source.
The vehicle-mounted USB power source interface protective circuit of the present invention is by setting switching clamper 10, and in switching clamper
10 voltages for detecting the power output end Vout are triggered when reaching the voltage protection threshold value of the vehicle-mounted USB power source, and
The delay circuit 20 is controlled in the presence of the second electronic switch Delayed conducting, controls the first electronic switch Q1 to close
It is disconnected, so as to control the power input Vin and power output end Vout to disconnect electrical connection, so as to avoid power supply from exporting
End Vout voltage pours in down a chimney to power input, so that the high voltage pulse that automobile batteries is inputted is carried out with vehicle-mounted USB power source
Isolation, to protect vehicle-mounted USB power source, it is ensured that its energy normal work, so that solving on-vehicle battery is touching USB power source interface
When, the problem of voltage of on-vehicle battery pours in down a chimney to through USB interface and damages component in vehicle-mounted USB power source.
Reference picture 1 and Fig. 2, in a preferred embodiment, the switching clamper 10 include the 3rd electronic switch Q3, the
One resistance R1, first resistor R2, the first voltage-stabiliser tube ZD1 and the first electric capacity C1, the input of the 3rd electronic switch Q3 is institute
The test side of the switching clamper 10 is stated, the output end of the 3rd electronic switch Q3 is the switching clamper 10
Control end, the controlled end of the 3rd electronic switch Q3 is connected through the first resistor R1 with the negative electrode of the voltage-stabiliser tube, described
First voltage-stabiliser tube ZD1 plus earth, the first resistor R2 be arranged in parallel input in the 3rd electronic switch Q3 with
Between controlled end, the first electric capacity C1 is arranged in parallel with the first voltage-stabiliser tube ZD1.
In the present embodiment, the first voltage-stabiliser tube ZD1 voltage stabilizing value is preferably 5.1V so that cars of the 3rd electronic switch Q3 in 5V
It can not be turned on when carrying USB power source voltage output to power output end Vout, and make the first electronic switch Q1 normal works.First electricity
Resistance R2 is used to provide bias voltage for the 3rd electronic switch Q3, and first resistor R1 is current-limiting resistance, and the first electric capacity C1 is filtered electrical
Hold, the clutter in voltage for filtering out input.When the 3rd electronic switch Q3 input access voltage reach it is described vehicle-mounted
During the voltage protection threshold value of USB power source, the 3rd electronic switch Q3 open, by the voltage output to the first electronic switch Q1 by
End is controlled, and by the voltage high of the first electronic switch Q1 controlled ends, so as to control the first electronic switch Q1 to be off state, is entered
And control electrically disconnecting for power input Vin and power output end Vout.
In above-described embodiment, the 3rd electronic switch Q3 is PNP type triode, the base of the PNP type triode
The controlled end of extremely described driving switch, the input of the extremely described driving switch of transmitting of the PNP type triode is described
The output end of the extremely described driving switch of the current collection of PNP type triode.
In the present embodiment, PNP type triode touches power output end due to the effect of delay circuit 20 in automobile batteries
Vout and make power output end Vout voltage be more than power input Vin when, PNP type triode will be managed prior to P-MOS, namely
Second electronic switch Q2 is turned on, and the first electronic switch Q1 grid is poured in down a chimney magnitude of voltage, the pole of positive-negative-positive three prior to source electrode input
Grid voltage is drawn high and controls P-MOS pipes to turn off by pipe after switch.
It is understood that PNP type triode is in conducting, its base stage and the pressure drop at emitter stage two ends are about 0.7V, and
First resistor R2 is arranged in parallel in base stage and emitter stage two ends, and its pressure drop and base stage are consistent with the pressure drop at emitter stage two ends, and first
Resistance R1 voltage is larger than 0.7V, and the first voltage-stabiliser tube ZD1 voltage stabilizing value is 5.1V, voltage when PNP type triode is turned on
About 5.1+0.7+0.7=6.5V, therefore, switching clamper 10 can also avoid vehicle-mounted USB power source interface protective circuit just
During normal output voltage, because the reasons such as power-supply fluctuation cause vehicle-mounted USB power source interface protection electricity to be protected by mistake.
Reference picture 1 and Fig. 2, in a preferred embodiment, the vehicle-mounted USB power source interface protective circuit also include the 3rd electricity
R3 and the 4th resistance R4 is hindered, the 3rd resistor R3 is arranged in series between the controlled end and ground of the first electronic switch Q1,
The 4th resistance R4 is arranged in series between the input and ground of the first electronic switch Q1.
In the present embodiment, 3rd resistor R3 is used to control the first electronic switch Q1 conductings, and the 4th resistance R4 is used to discharge the
One electronic switch Q1 is stored in the energy in the first electronic switch Q1 in the second electronic switch Q2 Delayed conductings.
Reference picture 1 and Fig. 2, in a preferred embodiment, the delay circuit 20 include the 5th resistance R5 and the second electric capacity
C2, the second electric capacity C2 first end are the input of the delay circuit 20, and the second end of the second electric capacity C2 is institute
The output end of delay circuit 20 is stated, and is connected with the first end of the 5th resistance R5；The second termination of the 5th resistance R5
Ground.
The voltage range of on-vehicle battery is general in 9-16V, and this voltage is greater than the vehicle-mounted USB electricity of 5V of USB power source interface
Source, when the power output end Vout of vehicle-mounted USB power source interface protective circuit accesses 9-16V high voltage, in delay circuit 20
The second electric capacity C2 when high voltage is accessed instantaneous short circuit, and by the grid of the second electronic switch Q2 controlled end, namely P-MOS pipes
Pole tension is drawn high, and P-MOS pipes is not turned on, and is then charged by the 5th resistance R5, until being full of, so as to control P-
Metal-oxide-semiconductor Delayed conducting, its delay time T can be calculated according to formula (1)：
T=RC*ln (Vout-V0)/(Vout-Vth)；(1)
Wherein, R is the 5th resistance R5 resistance, and C is to be arranged in parallel the second electric capacity C2 in P-MOS tube grids and source electrode
Capacity, V0 is the initial voltage value between the second electric capacity C2 two electrodes, and specially 0V, Vth is metal-oxide-semiconductor turn-on voltage,
AO3401 types P-MOS manages general 1V, and Vout is that on-vehicle battery pours in down a chimney to power output end Vout voltage.If the 5th resistance R5's
Resistance value takes 1M Ω, and the second electric capacity C2 capacitance takes 1uF, and the P-MOS pipe Delayed conducting times can be calculated using formula (1),
When the on-vehicle battery voltage that power output end Vout is contacted is 9V, P-MOS pipes delay time is 117ms；Work as power output end
When the on-vehicle battery voltage of Vout contacts is 16V, P-MOS pipes delay time is 64ms.
Reference picture 1 and Fig. 2, in a preferred embodiment, the vehicle-mounted USB power source interface protective circuit also include the 6th electricity
R6 and the second voltage-stabiliser tube ZD2 is hindered, the negative electrode of the second voltage-stabiliser tube ZD2 is connected with the power input Vin, and described second is steady
Pressure pipe ZD2 anode is connected with the controlled end of the second electronic switch Q2；The 6th resistance R6 is arranged in series in described
Between two electronic switch Q2 input and ground；Wherein,
The resistance of the 6th resistance R6 is much smaller than the second electronic switch Q2 internal resistance.
In the present embodiment, in order to avoid having during high voltage input, the high pressure is added to the second electronic switch Q2 controlled end,
Namely the grid of P-MOS pipes will also puncture insulating barrier and damage P-MOS pipes, in parallel second between P-MOS tube grids and source electrode
Voltage-stabiliser tube ZD2 protects P-MOS tube grids not breakdown to limit grid voltage below voltage-stabiliser tube voltage stabilizing value.6th resistance R6
For discharging during the second electronic switch Q2 Delayed conductings, the energy in the second electronic switch Q2 is stored in.
Reference picture 1 and Fig. 2, in a preferred embodiment, the vehicle-mounted USB power source interface protective circuit also include being used to release
Put the discharge circuit 30 of the energy of the power output end Vout, input and the power output end of the discharge circuit 30
Vout connections, the output of the discharge circuit 30.
In the present embodiment, discharge circuit 30 is used to automobile batteries contacting power output end Vout and after withdrawing, with second
The electric energy stored in electronic switch Q2 pipes the second electric capacity C2 in parallel is discharged.
In above-described embodiment, the discharge circuit 30 includes the first diode D1 and the 7th resistance R7, second electric capacity
C2 first end and the first end of the 7th resistance R7, the second end of the second electric capacity C2 is with the first diode D1's
Negative electrode is connected；The anode of the first diode D1 is connected with the second end of the 7th resistance R7, and is grounded.
In the present embodiment, the first diode D1 and the 7th resistance R7 be used for the second electric capacity C2 formation discharge loops, with
When power output end Vout does not have electric energy output, the energy stored in the second electric capacity C2 of release.
Reference picture 1 and Fig. 2, in a preferred embodiment, the vehicle-mounted USB power source interface protective circuit also include the 3rd electricity
Hold C3, the 4th electric capacity C4, the 5th electric capacity C5 and the 6th electric capacity C6, the 3rd electric capacity C3 and the 4th electric capacity C4 are arranged in series
Between the power input Vin and ground, the 5th electric capacity C5 and the 6th electric capacity C6 are arranged in series in the power supply
Between output end vo ut and ground.
In the present embodiment, electric capacity C3, C4 are arranged in series between power input Vin and ground respectively, with the car to input
Carry USB power source to be filtered, electric capacity C5, C6 are arranged in series between power output end Vout and ground respectively, to export power supply
End Vout vehicle-mounted USB power source is exported after being filtered.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, it is every at this
Under the inventive concept of invention, the equivalent structure transformation made using description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical fields in the scope of patent protection of the present invention.
Claims (10)
1. a kind of vehicle-mounted USB power source interface protective circuit, it is characterised in that the vehicle-mounted USB power source interface protective circuit includes
For connecting the power input of vehicle-mounted USB power source and being arranged at for connecting the power output end of electrical equipment, being sequentially connected in series
The first electronic switch and the second electronic switch between the power input and the power output end, and switch clamper electricity
The input of road and delay circuit, the test side of the switching clamper and the delay circuit is exported with the power supply respectively
End connection, the control end of the switching clamper is connected with the controlled end of first electronic switch；The delay circuit
Output end is connected with the controlled end of second electronic switch；Wherein,
First electronic switch and the second electronic switch, during for turning at the same time, the vehicle-mounted USB power source is exported to institute
Power output end is stated, one of wherein during shut-off, the vehicle-mounted USB power source is cut off and exports to the power output end；
Be in first electronic switch and the second electronic switch under off state, the switching clamper, for
The voltage that the delay circuit detects the power output end reaches the voltage protection threshold value of the vehicle-mounted USB power source and to institute
During the conducting progress delays time to control for stating the second electronic switch, output clamp signal clamps down on the shut-off that the first electronic switch is stated in residence
State.
2. vehicle-mounted USB power source interface protective circuit as claimed in claim 1, it is characterised in that the switching clamper bag
Include the 3rd electronic switch, first resistor, second resistance, the first voltage-stabiliser tube and the first electric capacity, the input of the 3rd electronic switch
Hold as the test side of the switching clamper, the output end of the 3rd electronic switch is the switching clamper
Control end, the controlled end of the 3rd electronic switch is connected through the first resistor with the negative electrode of the voltage-stabiliser tube, and described first
The plus earth of voltage-stabiliser tube, the second resistance is arranged in parallel between the input and controlled end of the 3rd electronic switch,
First electric capacity is arranged in parallel with first voltage-stabiliser tube.
3. vehicle-mounted USB power source interface protective circuit as claimed in claim 2, it is characterised in that the 3rd electronic switch is
PNP type triode, the base stage of the PNP type triode is the controlled end of the driving switch, the PNP type triode
The input of the extremely described driving switch of transmitting, the output end of the extremely described driving switch of current collection of the PNP type triode.
4. vehicle-mounted USB power source interface protective circuit as claimed in claim 1, it is characterised in that first electronic switch and/
Or second electronic switch be the P-MOS pipes with body diode, first electronic switch and second electronic switch it is defeated
Enter the drain electrode of the end correspondence P-MOS pipes, first electronic switch is corresponding with the output end of second electronic switch described
The source electrode of P-MOS pipes, the grid of first electronic switch P-MOS pipes corresponding with the controlled end of second electronic switch
Pole.
5. vehicle-mounted USB power source interface protective circuit as claimed in claim 1, it is characterised in that the vehicle-mounted USB power source interface
Protection circuit also includes 3rd resistor and the 4th resistance, and the 3rd resistor is arranged in series in the controlled of first electronic switch
Between end and ground, the 4th resistant series are arranged between the input of first electronic switch and ground wherein,
The resistance of 4th resistance is much smaller than the internal resistance of first electronic switch.
6. vehicle-mounted USB power source interface protective circuit as claimed in claim 1, it is characterised in that the delay circuit includes the
Five resistance and the second electric capacity, the first end of second electric capacity is the input of the delay circuit, the of second electric capacity
Two ends are the output end of the delay circuit, and are connected with the first end of the 5th resistance；Second end of the 5th resistance
Ground connection.
7. vehicle-mounted USB power source interface protective circuit as claimed in claim 6, it is characterised in that the vehicle-mounted USB power source interface
Protection circuit also includes being used to discharge the discharge circuit of the energy of the power output end, the input of the discharge circuit and institute
State power output end connection, the output of the discharge circuit.
8. vehicle-mounted USB power source interface protective circuit as claimed in claim 7, it is characterised in that the discharge circuit includes the
One diode and the 7th resistance, the first end of the 7th resistance are connected with the first end of second electric capacity, and the described 1st
The negative electrode of pole pipe is connected with the second end of second electric capacity, the anode of first diode and the second of the 7th resistance
End connection, and be grounded.
9. vehicle-mounted USB power source interface protective circuit as claimed in claim 1, it is characterised in that the vehicle-mounted USB power source interface
Protection circuit also includes the 6th resistance and the second voltage-stabiliser tube, and the 6th resistant series are arranged at the defeated of second electronic switch
Enter between end and ground；The negative electrode of second voltage-stabiliser tube is connected with the power input, the anode of second voltage-stabiliser tube with
The controlled end connection of second electronic switch；Wherein,
The resistance of 6th resistance is much smaller than the internal resistance of the second electronic switch.
10. the vehicle-mounted USB power source interface protective circuit as described in claim 1 to 9 any one, it is characterised in that the car
Carrying USB power source interface protective circuit also includes the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and the 6th electric capacity, the 3rd electric capacity
And the 4th electric capacity is arranged in series between the power input and ground, the 5th electric capacity and the 6th electric capacity series connection
It is arranged between the power output end and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710544549.0A CN107276037B (en) | 2017-07-04 | 2017-07-04 | Vehicle-mounted USB power interface protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710544549.0A CN107276037B (en) | 2017-07-04 | 2017-07-04 | Vehicle-mounted USB power interface protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107276037A true CN107276037A (en) | 2017-10-20 |
| CN107276037B CN107276037B (en) | 2020-06-09 |
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ID=60071661
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710544549.0A Expired - Fee Related CN107276037B (en) | 2017-07-04 | 2017-07-04 | Vehicle-mounted USB power interface protection circuit |
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| Country | Link |
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| CN (1) | CN107276037B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980977A (en) * | 2019-03-29 | 2019-07-05 | 广东美的制冷设备有限公司 | Power device and electric appliance |
| CN110880302A (en) * | 2019-12-05 | 2020-03-13 | 山东超越数控电子股份有限公司 | LCD screen anti-screen-splash system based on domestic processor and implementation method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204967258U (en) * | 2015-09-23 | 2016-01-13 | 惠州华阳通用电子有限公司 | A power output short -circuit protection circuit for USB battery charging outfit |
| CN205583663U (en) * | 2016-04-20 | 2016-09-14 | 深圳市航盛电子股份有限公司 | High -low pressure self preservation protects circuit |
-
2017
- 2017-07-04 CN CN201710544549.0A patent/CN107276037B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204967258U (en) * | 2015-09-23 | 2016-01-13 | 惠州华阳通用电子有限公司 | A power output short -circuit protection circuit for USB battery charging outfit |
| CN205583663U (en) * | 2016-04-20 | 2016-09-14 | 深圳市航盛电子股份有限公司 | High -low pressure self preservation protects circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980977A (en) * | 2019-03-29 | 2019-07-05 | 广东美的制冷设备有限公司 | Power device and electric appliance |
| CN110880302A (en) * | 2019-12-05 | 2020-03-13 | 山东超越数控电子股份有限公司 | LCD screen anti-screen-splash system based on domestic processor and implementation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107276037B (en) | 2020-06-09 |
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