CN209462021U - A kind of reverse connection preventing over-pressure safety device, earphone and USB charging unit - Google Patents
A kind of reverse connection preventing over-pressure safety device, earphone and USB charging unit Download PDFInfo
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- CN209462021U CN209462021U CN201920150032.8U CN201920150032U CN209462021U CN 209462021 U CN209462021 U CN 209462021U CN 201920150032 U CN201920150032 U CN 201920150032U CN 209462021 U CN209462021 U CN 209462021U
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Abstract
The utility model belongs to charge protection technical field; more particularly to a kind of reverse connection preventing over-pressure safety device, earphone and USB charging unit; including overload protection module, reverse connecting protection module and overvoltage protective module; wherein, overvoltage protective module includes control signal generation module and first switch module.Input DC power is disconnected or is connected to according to the electric current of input DC power by overload protection module, input DC power is disconnected or is connected to according to the connection status of input DC power by reverse connecting protection module, input DC power is disconnected or is connected to according to the voltage of input DC power by overvoltage protective module, electronic equipment internal circuit and/or electronic device is protected not to be burned when overcurrent (overload) or over-voltage or reversal connection (reversed erroneous input) occurs in input DC power to realize, and overload just can be realized by discrete component, over-voltage and reverse connecting protection, circuit is simple and reliable.
Description
Technical field
The utility model belongs to charge protection technical field more particularly to a kind of reverse connection preventing over-pressure safety device, earphone
And USB charging unit.
Background technique
Currently, meeting people significantly to electricity with universal and battery capacity the increase of smart electronics product fast charge
The demand of sub- product battery charging rate and battery capacity.And electronic product charging environment is extremely complex, and power network fluctuation also can
Input DC power over-voltage, or the positive and negative anodes reversal connection of charging input power are caused, so as to cause charging IC (Integrated
Circuit, integrated circuit) or be burned the case where such as power management module happen occasionally, so to electronic product charging circuit
Reversal connection and overvoltage protection it is very crucial.
For example, current earphone charging or USB (Universal Serial Bus, universal serial bus) power supply circuit are big
The maximum supply voltage of part is smaller than 7V, and has many quick charger output voltages to be greater than 7V on the market
, therefore this electronic product/electronic component such as earphone is easily mispluged or erroneous input affected by high, and internal circuit is caused to burn
It is bad.
Traditional common overvoltage protection scheme mainly increases overvoltage protection IC, such as Fairchild in mainboard charge path
FPF2280, but this IC higher cost.Overvoltage protection or reverse connecting protection are either realized using complicated circuit structure respectively.
Therefore traditional reverse connection preventing over-pressure safety device presence can only carry out reverse protection or overvoltage protection, and circuit structure
Complicated and higher cost defect.
Utility model content
It is filled in view of this, the utility model embodiment provides a kind of reverse connection preventing over-pressure safety device, earphone and USB
Electric installation, it is intended to it solves that reverse protection or overvoltage protection can only be carried out existing for traditional reverse connection preventing over-pressure safety device,
And the problem of circuit structure complexity and higher cost.
The first aspect of the utility model embodiment provides a kind of reverse connection preventing over-pressure safety device, comprising:
It is connect with input DC power, it is straight for disconnecting or being connected to the input according to the electric current of the input DC power
The overload protection module in galvanic electricity source.
It is connect with the overload protection module, for institute to be disconnected or be connected to according to the connection status of the input DC power
State the reverse connecting protection module of input DC power.
It is connect with the reverse connecting protection module, for disconnecting or being connected to described defeated according to the voltage of the input DC power
Enter the overvoltage protective module of DC power supply.
The overvoltage protective module includes: in one of the embodiments,
It is connect with the reverse connecting protection module, for raw according to the voltage and predetermined voltage threshold of the input DC power
At the control signal generation module of control signal.
It is connect with the control signal generation module, for disconnecting or being connected to the input direct-current according to the control signal
The first switch module of power supply.
The reverse connection preventing over-pressure safety device in one of the embodiments, further include:
It is connect with the input DC power, the first filter module for being filtered to the input DC power.
The overload protection module is specifically used for according to the filtered input DC power of first filter module
Electric current disconnect or be connected to the input DC power.
The reverse connection preventing over-pressure safety device in one of the embodiments, further include:
It is connect with the reverse connecting protection module and the overvoltage protective module, for being filtered to the input DC power
Second filter module of wave.
The overvoltage protective module is specifically used for according to the filtered input DC power of second filter module
Voltage disconnect or be connected to the input DC power.
The reverse connection preventing over-pressure safety device in one of the embodiments, further include:
It is connect with the overvoltage protective module, the third filter module for being filtered to the input DC power.
The reverse connection preventing over-pressure safety device in one of the embodiments, further include:
It is connect with the overvoltage protective module, for storing and discharging the energy-storage module of electric energy.
The reverse connecting protection module includes the first field-effect tube, the first voltage-stabiliser tube, the first electricity in one of the embodiments,
Resistance and first diode.
The anode of the grid of first field-effect tube and the first end of the first resistor and first voltage-stabiliser tube is even
It connects, the second end of the first resistor is connect with power ground.
The cathode of the cathode and the first diode of the source electrode of first field-effect tube and first voltage-stabiliser tube connects
It connects, the anode of the first diode is connect with the second end of the first resistor.
The drain electrode of first field-effect tube is the input DC power input terminal of the reverse connecting protection module.
The cathode of the first diode is the input dc power source output terminal of the reverse connecting protection module.
The control signal generation module includes second resistance, 3rd resistor, the 4th electricity in one of the embodiments,
Resistance, the 5th resistance, the second voltage-stabiliser tube and the first triode.
The first end of the second resistance is the input DC power input terminal of the control signal generation module.
The first end of the second resistance and the first end of the 4th resistance and the emitter of first triode
Connection.
The second end of the second resistance is connect with the first end of the cathode of second voltage-stabiliser tube and the 3rd resistor,
The anode of second voltage-stabiliser tube is connect with power ground.
The second end of the 3rd resistor is connect with the base stage of the second end of the 4th resistance and first triode.
The collector of first triode is connect with the first end of the 5th resistance, the second end of the 5th resistance
It is connect with power ground.
The control signal output of the extremely described control signal generation module of the current collection of first triode.
The first switch module includes the second field-effect tube and the 6th resistance in one of the embodiments,.
The source electrode of second field-effect tube is the input DC power input terminal of the first switch module.
The drain electrode of second field-effect tube is the input dc power source output terminal of the first switch module.
The grid of second field-effect tube is connect with the first end of the 6th resistance, the second end of the 6th resistance
For the control signal input of the first switch module.
Second the second field-effect tube of field-effect tube the second field-effect tube of the second field-effect tube the second field-effect tube second effect
Should the second aspect of pipe the utility model embodiment provide a kind of earphone, including reverse connection preventing overvoltage protection as described above
Device.
The third aspect of the utility model embodiment provides a kind of USB charging unit, including counnter attack as described above
Take over control over-pressure safety device.
Above-mentioned a kind of reverse connection preventing over-pressure safety device, earphone and USB charging unit, by overload protection module according to
The electric current of the input DC power disconnects or is connected to the input DC power, and reverse connecting protection module is according to input DC power
Connection status disconnect or connection input DC power, overvoltage protective module according to the voltage of input DC power disconnect or be connected to
Input DC power is protected to realize when overcurrent (overload), over-voltage or reversal connection (reversed erroneous input) occurs in input DC power
Shield electronic equipment internal circuit and/or electronic device be not burned, and by discrete component just can be realized overload, over-voltage with
And reverse connecting protection, circuit are simple and reliable.
Detailed description of the invention
It, below will be to embodiment or the prior art in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only that this is practical new
Some embodiments of type for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram for reverse connection preventing over-pressure safety device that an embodiment of the present invention provides；
Fig. 2 is a kind of another structural representation for reverse connection preventing over-pressure safety device that an embodiment of the present invention provides
Figure；
Fig. 3 is a kind of another structural representation for reverse connection preventing over-pressure safety device that an embodiment of the present invention provides
Figure；
Fig. 4 is a kind of another structural representation for reverse connection preventing over-pressure safety device that an embodiment of the present invention provides
Figure；
Fig. 5 is a kind of another structural representation for reverse connection preventing over-pressure safety device that an embodiment of the present invention provides
Figure；
Fig. 6 is a kind of another structural representation for reverse connection preventing over-pressure safety device that an embodiment of the present invention provides
Figure；
Fig. 7 is a kind of exemplary circuit principle for reverse connection preventing over-pressure safety device that an embodiment of the present invention provides
Figure.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Referring to Fig. 1, a kind of structural representation of reverse connection preventing over-pressure safety device 10 provided by the embodiment of the utility model
Figure, for ease of description, only the parts related to this embodiment are shown, and details are as follows:
A kind of reverse connection preventing over-pressure safety device 10 includes that overload protection module 11, reverse connecting protection module 12 and over-voltage are protected
Protect module 13.
Overload protection module 11 is used to that input DC power to be disconnected or be connected to according to the electric current of input DC power.
In specific implementation, the anode of input DC power is inputted from the first end of overload protection module 11, input dc power
The cathode in source is connect with power ground, and the second end of overload protection module 11 is connect with reverse connecting protection module 12.When power circuit is sent out
It when raw failure or exception or overload, is constantly increased along with electric current in circuit, raised electric current is possible to certain in damage circuit
A little important devices or valuable device, it is also possible to burn circuit or even cause fire, overload protection module 11 is in current anomaly liter
Height arrives certain height, that is, when being more than the maximum current that protective module 11 is able to bear, overload protection module 11 is then according to the mistake
It carries electric current and disconnects input DC power, to play the role of protecting circuit safety operation.
Reverse connecting protection module 12 is connect with overload protection module 11, for being disconnected according to the connection status of input DC power
Or connection input DC power.
In specific implementation, when the positive and negative anodes of input DC power are reversely connected, reverse connecting protection module 12 is according to reversal connection
Input DC power disconnects input DC power, so that circuit safety be protected to run.
Overvoltage protective module 13 is connect with reverse connecting protection module 12, for being disconnected according to the voltage of input DC power or even
Logical input DC power.
In specific implementation, when the positive and negative anodes of input DC power correctly connect, input DC power is from overload protection mould
Block 11 flows through reverse connecting protection module 12, passes through overvoltage protective module 13, finally exports and powers to late-class circuit.Input direct-current
When the positive and negative anodes of power supply correctly connect, if the voltage of the input DC power of input is excessive, that is, when being more than predetermined voltage threshold, mistake
Press protective module 13 that will disconnect input DC power according to the voltage of input DC power at this time, to play protection circuit peace
The effect of row for the national games.
The present embodiment is realized by overload protection module, reverse connecting protection module and overvoltage protective module defeated in summary
Enter in the case that overcurrent (overload), over-voltage and reversal connection/misconnection occurs in DC power supply, protects the transmission circuit of input DC power
And/or each component is not damaged in circuit.
Referring to Fig. 2, in one embodiment, overvoltage protective module 13 includes that control signal generation module 131 and first is opened
Close module 132.
Control signal generation module 131 is connect with reverse connecting protection module 12, for according to the voltage of input DC power with
Predetermined voltage threshold generates control signal.
First switch module 132 is connect with control signal generation module 131, for disconnecting or being connected to defeated according to control signal
Enter DC power supply.
In specific implementation, when the voltage value of input DC power is less than predetermined voltage threshold, signal generation module is controlled
131 generate connection control signal, and first switch module 132 controls signal communication input DC power according to connection.When input is straight
When the voltage value in galvanic electricity source is more than or equal to predetermined voltage threshold, control signal generation module 131, which generates, disconnects control signal, and first
Switch module 132 disconnects input DC power according to control signal is disconnected.To realize overvoltage protection, each first device in circuit is protected
Part is not damaged, that is, electronic equipment internal device is protected not to be burned.
Referring to Fig. 3, in one embodiment, a kind of reverse connection preventing over-pressure safety device 10 further includes the first filter module
14。
First filter module 14 is connect with input DC power, for being filtered to input DC power.
Overload protection module 11 is specifically used for disconnected according to the electric current of the filtered input DC power of the first filter module 14
Open or be connected to input DC power.
In specific implementation, the first filter module 14 include capacitor, inductance, RC filter circuit, in π type filter circuit at least
It is a kind of.When input DC power positive and negative anodes correctly connect namely input DC power anode with the first filter module 14 just
The connection of pole input terminal, when the cathode of input DC power is connect with the negative input of the first filtering module 14, the first filtering mould
Block 14 to input DC power carry out first time filtering, with for overload protection module 11 provide Low emissivity interfere, low noise it is defeated
Enter DC power supply.Improve the spirit that overload protection module 11 disconnected or be connected to input DC power according to the electric current of input DC power
Sensitivity and accuracy.
Referring to Fig. 4, in one embodiment, a kind of reverse connection preventing over-pressure safety device 10 further includes the second filter module
15。
Second filter module 15 is connect with reverse connecting protection module 12 and overvoltage protective module 13, for input DC power
It is filtered.
Overvoltage protective module 13 is specifically used for disconnected according to the voltage of the filtered input DC power of the second filter module 15
Open or be connected to input DC power.
In specific implementation, the second filter module 15 include capacitor, inductance, RC filter circuit, in π type filter circuit at least
One kind, the second filter module 15 is filtered the input DC power transmitted from reverse connecting protection module 12, for over-voltage
Protective module 13 provide Low emissivity interference, low noise input DC power, so as to overvoltage protective module 13 can more it is sensitive more
Input DC power is accurately disconnected or is connected to according to the voltage of the filtered input DC power of the second filter module 15.
Referring to Fig. 5, in one embodiment, a kind of reverse connection preventing over-pressure safety device 10 further includes third filter module
16。
It is connect with overvoltage protective module 13, the third filter module 16 for being filtered to input DC power.
In specific implementation, third filter module 16 include capacitor, inductance, RC filter circuit, in π type filter circuit at least
One kind, third filter module 16 are filtered the input DC power transmitted from overvoltage protective module 13, for energy storage
Module 17 and late-class circuit provide the input DC power of Low emissivity interference, low noise.
Referring to Fig. 6, in one embodiment, a kind of reverse connection preventing over-pressure safety device 10 further includes energy-storage module 17.
Energy-storage module 17 is connect with overvoltage protective module 13, for storing and discharging electric energy.
In specific implementation, energy-storage module 17 can store and discharge electric energy, input DC power occur it is abnormal or compared with
It when great fluctuation process, can externally discharge for junior's circuit electric energy supplement, so that the input dc power exported from output port of power source 15
The voltage held stationary in source exports.
Referring to Fig. 7, in one embodiment, overload protection module 11 includes insurance device F1.
The first end for insuring device F1 is the input DC power input terminal of overload protection module 11, the of insurance device F1
Two ends are the input dc power source output terminal of overload protection module 11.
In specific implementation, insurance device F1 includes fuse.The first end for insuring device F1 and the first filter module 14 are just
Pole input terminal VIN+ connection, the drain D for insuring the second end of device F1 and the first field-effect tube Q1 of reverse connecting protection module 12 connect
It connects, input DC power is transferred to insurance device F1 from the electrode input end VIN+ of the first filter module 14.When event occurs for circuit
When barrier or exception or overload, constantly increased along with electric current in the circuit of input DC power, raised electric current is possible to damage
Certain important devices or valuable device in circuit, it is also possible to it burns circuit or even causes fire, and in circuit malfunctions
Or when exception or overload, almost unobstructed current loop will be generated rapidly, and especially big electric current generates heat by insurance device F1
It can be fused immediately；In current overload, cause the general power using electronic equipment internal device excessive, that is, the electric current mistake consumed
Greatly, also constantly increased by the electric current of fuse, cause the electrical power of fuse to become larger and generate thermal energy and be blown, pass through
Fuse itself fusing cutting input DC power, to play the role of protecting circuit safety operation.
Referring to Fig. 7, in one embodiment, the first filter module 14 includes first capacitor C1.The first of first capacitor C1
End is the electrode input end VIN+ of the first filter module 14, and the second end of first capacitor C1 is that the cathode of the first filter module 14 is defeated
Enter to hold VIN- (being equivalent to power ground GND), the second end of first capacitor C1 is connect with power ground GND.First capacitor C1 is to input
DC power supply is filtered, straight with the input for providing stable, Low emissivity interference and low noise acoustic jamming for insurance device F1
Galvanic electricity source.
Referring to Fig. 7, in one embodiment, reverse connecting protection module 12 include the first field-effect tube Q1, the first voltage-stabiliser tube D1,
First resistor R1 and first diode D2.
The grid G of first field-effect tube Q1 is connect with the anode of the first end of first resistor R1 and the first voltage-stabiliser tube D1, the
The second end of one resistance R1 is connect with power ground GND.
The source S of first field-effect tube Q1 is connect with the cathode of the cathode of the first voltage-stabiliser tube D1 and first diode D2, the
The anode of one diode D2 is connect with the first end of first resistor R1.
The drain D of first field-effect tube Q1 is the input DC power input terminal of reverse connecting protection module 12.
The cathode of first diode Q1 is the input dc power source output terminal of reverse connecting protection module 12.
In specific implementation, the first field-effect tube Q1 is p-type field-effect tube.Optionally, first diode D2 uses reversed leakage
The low diode of electric current, so that having by the voltage that first diode D2 is transferred to the source S of the first field-effect tube of p-type Q1 larger
Compared with stable voltage.When input DC power anode and the first end of first capacitor C1 (the first filter module 14 it is positive defeated
Enter to hold VIN+) connection, when input DC power is inputted from the first end of first capacitor C1, the grid G of the first field-effect tube of p-type Q1
It is connect by first resistor R1 with power ground GND, the grid G of the first field-effect tube of p-type Q1 is low potential, input DC power
The source S of the first field-effect tube of p-type Q1 is conducted to by the endophyte diode forward of the first field-effect tube of p-type Q1, at this point,
Voltage VGS between the grid G and source S of the first field-effect tube of p-type Q1 is negative pressure, will lead to the first field-effect tube of p-type Q1 just
Often conducting, input DC power can normally flow through p-type the first field-effect tube Q1 and power to late-class circuit.
When (cathode of the first filter module 14 inputs to the second end of first capacitor C1 for the positive misconnection of input DC power
Hold VIN-), the cathode of input DC power and first end (the electrode input end VIN of the first filter module 14 of first capacitor C1
+) connection when, input DC power by first diode D2 forward conduction to the first field-effect tube of p-type Q1 source S, meanwhile,
Input DC power is transmitted to the grid G of the first field-effect tube of p-type Q1 through first resistor R1, at this time the first field-effect tube of p-type Q1
Grid G voltage be input DC power voltage, because there are voltage drop, general one or two poles for first diode D2 forward conduction
The conduction voltage drop of pipe D2 is 0.5V to 0.7V, so that the VGS between the grid G and source S of the first field-effect tube of p-type Q1 is positive
Pressure, p-type the first field-effect tube Q1 disconnect input DC power, achieve the purpose that reverse connecting protection.
Optionally, the first voltage-stabiliser tube D1 is the zener diode that breakdown reverse voltage is 5.1V.First voltage-stabiliser tube D1 can be with
Prevent when input DC power is reversely connected, the source S of the first field-effect tube Q1 between the grid G of the first field-effect tube Q1 due to
The breakdown damage there are high back voltage.
Referring to Fig. 7, in one embodiment, it includes second resistance R2,3rd resistor R3, the 4th that control signal, which generates 131,
Resistance R4, the 5th resistance R5, the second voltage-stabiliser tube D3 and the first triode Q2
The first end of second resistance R2 is the input DC power input terminal for controlling signal generation module 131.
The first end of second resistance R2 is connect with the emitter e of the first end of the 4th resistance R4 and the first triode Q2.
The second end of second resistance R2 is connect with the first end of the cathode of the second voltage-stabiliser tube D3 and 3rd resistor R3, and second is steady
The anode of pressure pipe D3 is connect with power ground GND.
The second end of 3rd resistor R3 is connect with the base stage b of the second end of the 4th resistance R4 and the first triode Q2.
The collector c of first triode Q2 is connect with the first end of the 5th resistance R5, the second end and electricity of the 5th resistance R5
The GND connection of source ground.
The collector c of first triode Q2 is the control signal output for controlling signal generation module 131.
Referring to Fig. 7, in one embodiment, first switch module 132 includes the second field-effect tube Q3 and the 6th resistance R6.
The source S of second field-effect tube Q3 is the input DC power input terminal of first switch module 132.
The drain D of second field-effect tube Q3 is the input dc power source output terminal of first switch module 132.
The grid G of second field-effect tube Q3 is connect with the first end of the 6th resistance R6, and the second end of the 6th resistance R6 is the
The control signal input of one switch module 132.
In specific implementation, the second field-effect tube Q3 is p-type field-effect tube, and the first triode Q2 is PNP type triode.It can
Choosing, the second voltage-stabiliser tube D3 includes the zener diode that reverse turn-on voltages are 5.1V.The conducting voltage of first triode Q2 is
0.3V to 0.7V, generally desirable 0.7V, therefore, predetermined voltage threshold is optionally 5.8V.When the voltage of input DC power is small
When 5.8V, the first triode Q2 cut-off is not turned on, and the second voltage-stabiliser tube D3 reversely ends, the grid G of the second field-effect tube of p-type Q3
It is equivalent to and is connect with power ground GND, the voltage VGS between the grid G and source S of the second field-effect tube of p-type Q3 is negative pressure, p-type
Second field-effect tube Q3 normally, input DC power is normally connected to, and is transferred to junior's circuit, is normally supplied for junior's circuit
Electricity.And when the voltage of input DC power is more than or equal to 5.8V, the second voltage-stabiliser tube D3 reverse-conducting, the first triode Q2 is also led
Logical, the gate-source VGS of the second field-effect tube Q3 is that positive pressure reaches so that p-type the second field-effect tube Q3 disconnects input DC power
The purpose of overvoltage protection.
And due to the electricity between emitter e and base stage b of the voltage Vr2 at the both ends second resistance R2 equal to the first triode Q2
The sum of the voltage of Veb and the both ends 3rd resistor R3 are pressed, the voltage Vd3 at the both ends of the second voltage-stabiliser tube D3 is equal to the first triode Q2's
The sum of voltage Vbc and the voltage Vr5 at both ends of the 5th resistance R5 between base stage b and emitter, therefore by adjusting third electricity
The predetermined voltage threshold of overvoltage protection is adjusted in the pressure stabilizing value of the resistance value and the second voltage-stabiliser tube D3 that hinder R3.
In specific implementation, whether overvoltage condition can be in by test verifying input DC power.Optionally, the 4th resistance
The first end of R4 is that the drain D (or first end of the second capacitor C3) of the first over-voltage test lead OVP, the second field-effect tube Q3 is
Second over-voltage test lead VBUS_P.Voltage tester is carried out by Portable voltage table or multimeter, as the first over-voltage test lead OVP
Voltage be equal to the second over-voltage test lead VBUS_P, or consider input DC power loss in the transmission, the first over-voltage is surveyed
When the voltage of examination end OVP is approximately equal to the voltage of the second over-voltage test lead VBUS_P, show the second non-reverse breakdown of voltage-stabiliser tube D3,
The first non-forward conduction of triode Q2, input DC power is by second effect pipe Q3 output, and input DC power is not at this time
More than the first voltage threshold, charging circuit is not at overvoltage condition；When the voltage of the first over-voltage test lead OVP is greater than the second over-voltage
When the voltage of test lead VBUS_P, show the second voltage-stabiliser tube D3 reverse breakdown and pressure stabilizing, the first triode Q2 forward conduction, input
DC power supply is transmitted to power ground GND by the first triode Q2 and the 5th resistance R5, the grid G of the second field-effect tube Q3 and
Voltage VGS between source S is positive pressure, so that p-type the second field-effect tube Q3 disconnects input DC power, input DC power
Voltage be in overvoltage condition.
In specific implementation, the second filter module 15 includes the second capacitor C2.Third filter module 16 includes third capacitor C3.
Second capacitor C2 and third capacitor C3 is filter capacitor.
The first end of second capacitor C2 is connect with the source S of first diode D2 and the first field-effect tube Q1, the second capacitor
The second end of C2 is connect with power ground GND, and the first end of the second capacitor C2 is that the input DC power of the second filter module 15 is defeated
Outlet.Second capacitor C2 carries out secondary filtering processing to the input DC power that transmits through reverse connecting protection module 12, with for
It controls signal generation module 131 and the input DC power of Low emissivity interference is provided.
The first end of third capacitor C3 is connect with the drain D of the second field-effect tube Q3, the second end and electricity of third capacitor C3
The GND connection of source ground, the first end of third capacitor C3 are the input dc power source output terminal of third filter module 16.Third capacitor C3
Third time filtering processing is carried out to the input DC power transmitted through first switch module 132, for 17 He of energy-storage module
Late-class circuit provides lower radiation interference and the input DC power compared with low noise.
First capacitor C1 is filtered the input DC power inputted from its first end, makes to be stablized, without making an uproar
The input DC power of acoustic jamming.Second capacitor C2 is to the output after insurance device F1 and the first field-effect tube Q1 transmission
Input DC power carries out secondary filtering processing, is transmitted further to the second field-effect tube Q3 later, while passing through C3 pairs of third capacitor
Third time filtering processing is carried out by the input DC power exported after the second field-effect tube Q3, finally again from input dc power
The output end VOUT in source is exported to power to rear polar circuit.In the transmission process of input DC power, to input DC power into
Row repeatedly filtering processing, can effectively purify input DC power, eliminate and input DC power is inhibited to produce in transmission process
Raw electromagnetic interference and noise.
Referring to Fig. 5, energy-storage module 17 includes energy storage capacitor C4 in specific implementation.The first end of storage capacitor C4 and the
The first end of three capacitor C3 is connected with the drain D of the second field-effect tube Q3, and the first end of storage capacitor C4 is energy-storage module 17
The second end of input DC power input terminal, storage capacitor C4 is connect with power ground GND.Storage capacitor C4 is in input DC power
It when there is exception or larger fluctuation, can externally discharge, so that the input exported from the output end VOUT of input DC power
The voltage of DC power supply keeps stablizing output.
It is illustrated below in conjunction with a kind of working principle of the Fig. 5 to reverse connection preventing over-pressure safety device 10:
The positive and negative anodes of input DC power correctly connect, i.e. the anode of input DC power and the first of first capacitor C1
End connection, the cathode of input DC power is connect with the first end of first capacitor C1, and the voltage of input DC power is no more than
When predetermined voltage threshold, input DC power is inputted from the first end of first capacitor C1, the grid G of the first field-effect tube of p-type Q1
It is connect by first resistor R1 with power ground GND, input DC power passes through two pole of endophyte of the first field-effect tube of p-type Q1
The source S moment of pipe forward conduction to the first field-effect tube of p-type Q1 cause the first field-effect tube of p-type Q1 grid G and source S it
Between voltage VGS be negative pressure so that p-type the first field-effect tube Q1 normally.Meanwhile the first triode Q2 cut-off, second is steady
Pressure pipe D3 reversely ends, and the voltage VGS between the grid G and source S of the second field-effect tube Q3 is negative pressure, so that the second field-effect
Pipe Q3 also normally.After input DC power can normally flow through p-type the first field-effect tube Q1 and the second field-effect tube Q3, from
The output end VOUT of input DC power is exported to power to late-class circuit.At this point, if circuit malfunctions or exception or overload when,
It is constantly increased along with electric current in the circuit of input DC power, the electric current of input DC power is more than that insurance device F1 can be with
The maximum current value of receiving will lead to insurance device F1 fusing, input DC power be disconnected, to realize overcurrent/overload protection.
The positive and negative anodes of input DC power are reversely connected, i.e. the positive misconnection of input DC power to the second of first capacitor C1
End, when the first end of the cathode misconnection of input DC power to first capacitor C1, input DC power passes through first diode D2
Forward conduction to the first field-effect tube of p-type Q1 source S, meanwhile, input DC power is transmitted to p-type first through first resistor R1
The grid G of field-effect tube Q1, because there are voltage drops for first diode D2 forward conduction, so that the grid of the first field-effect tube of p-type Q1
Voltage VGS between pole G and source S is positive pressure, and p-type the first field-effect tube Q1 disconnects input DC power, reaches reverse connecting protection
Purpose.
The positive and negative anodes of input DC power correctly connect, and the voltage of input DC power is greater than predetermined voltage threshold (example
Such as larger than 5.8V) when, the second voltage-stabiliser tube D3 reverse-conducting, the first triode Q2 is also switched on, the grid of the second field-effect tube of P type Q3
Voltage VGS between pole G and source S is positive pressure, so that p-type the second field-effect tube Q3 disconnection input DC power, reaches over-voltage
The purpose of protection.
The second aspect of the utility model embodiment provides a kind of earphone, including reverse connection preventing over-voltage as described above
Protective device 10.
A kind of earphone of the present embodiment, by overload protection module, reverse connecting protection module and overvoltage protective module to defeated
Enter DC power supply voltage is excessive or input DC power occur reversal connection, misconnection or input DC power electric current it is excessive etc.
Input DC power is disconnected when situation, is protected to realize when overcurrent (overload) or over-voltage or reversal connection occurs in input DC power
Electronic equipment internal circuit and/or electronic device are not burned, and by discrete component, realize overload, over-voltage and reversal connection
Protection, circuit are simple and reliable.It, being capable of cost-effectively due to not using control chip and other numerous complicated circuit components
It is low.
The third aspect of the utility model embodiment provides a kind of USB charging unit, including counnter attack as described above
Take over control over-pressure safety device 10.
A kind of USB device of the present embodiment, passes through overload protection module, reverse connecting protection module and overvoltage protective module pair
The voltage of input DC power is excessive or input DC power reversal connection/misconnection occurs or the electric current of input DC power is excessive
When disconnect input DC power, thus realize input DC power occur overcurrent (overload) or over-voltage or be reversely connected when protect
Shield electronic equipment internal circuit and/or electronic device are not burned, and by discrete component, realize overload, over-voltage and anti-
Protection is connect, circuit is simple and reliable.It, being capable of cost-effectively due to not using control chip and other numerous complicated circuit components
It is low.
Throughout the specification to " various embodiments ", " in embodiments ", " embodiment " or " embodiment party
The reference of formula " etc., which is meant, is included at least one embodiment about a particular feature, structure, or characteristic described in embodiment
In.Therefore, phrase " in various embodiments ", " in some embodiments ", " in one embodiment " or " implementing
In mode " etc. the appearance in appropriate place throughout the specification be not necessarily all referring to same embodiment.In addition, specific spy
Sign, structure or characteristic can combine in any suitable manner in one or more embodiments.Implement accordingly, with respect to one
The a particular feature, structure, or characteristic that mode shows or describes can entirely or partly with one or more of the other embodiment spy
Sign, structure or characteristic are combined, without assuming that such combination is not illogical or non-functional limitation.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all practical at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the guarantor of the utility model within novel spirit and principle
Within the scope of shield.
Claims (11)
1. a kind of reverse connection preventing over-pressure safety device, which is characterized in that the reverse connection preventing over-pressure safety device includes:
It is connect with input DC power, for disconnecting or being connected to the input dc power according to the electric current of the input DC power
The overload protection module in source；
It is connect with the overload protection module, for disconnecting or being connected to described defeated according to the connection status of the input DC power
Enter the reverse connecting protection module of DC power supply；
It is connect with the reverse connecting protection module, it is straight for disconnecting or being connected to the input according to the voltage of the input DC power
The overvoltage protective module in galvanic electricity source.
2. reverse connection preventing over-pressure safety device as described in claim 1, which is characterized in that the overvoltage protective module includes:
It connect with the reverse connecting protection module, is controlled for being generated according to the voltage and predetermined voltage threshold of the input DC power
The control signal generation module of signal processed；
It is connect with the control signal generation module, for disconnecting or being connected to the input DC power according to the control signal
First switch module.
3. reverse connection preventing over-pressure safety device as described in claim 1, which is characterized in that the reverse connection preventing overvoltage protection dress
It sets further include:
It is connect with the input DC power, the first filter module for being filtered to the input DC power；
The overload protection module is specifically used for the electricity according to the filtered input DC power of first filter module
Stream disconnects or is connected to the input DC power.
4. reverse connection preventing over-pressure safety device as described in claim 1, which is characterized in that the reverse connection preventing overvoltage protection dress
It sets further include:
It is connect with the reverse connecting protection module and the overvoltage protective module, for what is be filtered to the input DC power
Second filter module；
The overvoltage protective module is specifically used for the electricity according to the filtered input DC power of second filter module
Break out or be connected to the input DC power.
5. reverse connection preventing over-pressure safety device as described in claim 1, which is characterized in that the reverse connection preventing overvoltage protection dress
It sets further include:
It is connect with the overvoltage protective module, the third filter module for being filtered to the input DC power.
6. reverse connection preventing over-pressure safety device as described in claim 1, which is characterized in that the reverse connection preventing overvoltage protection dress
It sets further include:
It is connect with the overvoltage protective module, for storing and discharging the energy-storage module of electric energy.
7. reverse connection preventing over-pressure safety device as described in claim 1, which is characterized in that the reverse connecting protection module includes the
One field-effect tube, the first voltage-stabiliser tube, first resistor and first diode；
The grid of first field-effect tube is connect with the anode of the first end of the first resistor and first voltage-stabiliser tube, institute
The second end for stating first resistor is connect with power ground；
The source electrode of first field-effect tube is connect with the cathode of the cathode of first voltage-stabiliser tube and the first diode, institute
The anode for stating first diode is connect with the second end of the first resistor；
The drain electrode of first field-effect tube is the input DC power input terminal of the reverse connecting protection module；
The cathode of the first diode is the input dc power source output terminal of the reverse connecting protection module.
8. reverse connection preventing over-pressure safety device as claimed in claim 2, which is characterized in that the control signal generation module packet
Include second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the second voltage-stabiliser tube and the first triode；
The first end of the second resistance is the input DC power input terminal of the control signal generation module；
The first end of the second resistance is connect with the emitter of the first end of the 4th resistance and first triode；
The second end of the second resistance is connect with the first end of the cathode of second voltage-stabiliser tube and the 3rd resistor, described
The anode of second voltage-stabiliser tube is connect with power ground；
The second end of the 3rd resistor is connect with the base stage of the second end of the 4th resistance and first triode；
The collector of first triode is connect with the first end of the 5th resistance, the second end and electricity of the 5th resistance
Connect to source；
The control signal output of the extremely described control signal generation module of the current collection of first triode.
9. reverse connection preventing over-pressure safety device as claimed in claim 2, which is characterized in that the first switch module includes the
Two field-effect tube and the 6th resistance；
The source electrode of second field-effect tube is the input DC power input terminal of the first switch module；
The drain electrode of second field-effect tube is the input dc power source output terminal of the first switch module；
The grid of second field-effect tube is connect with the first end of the 6th resistance, and the second end of the 6th resistance is institute
State the control signal input of first switch module.
10. a kind of earphone, which is characterized in that the earphone includes reverse connection preventing over-voltage as described in any one of claim 1 to 9
Protective device.
11. a kind of USB charging unit, which is characterized in that the USB charging unit includes as described in any one of claim 1 to 9
Reverse connection preventing over-pressure safety device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920150032.8U CN209462021U (en) | 2019-01-26 | 2019-01-26 | A kind of reverse connection preventing over-pressure safety device, earphone and USB charging unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920150032.8U CN209462021U (en) | 2019-01-26 | 2019-01-26 | A kind of reverse connection preventing over-pressure safety device, earphone and USB charging unit |
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| CN209462021U true CN209462021U (en) | 2019-10-01 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113078661A (en) * | 2021-05-19 | 2021-07-06 | 广东电网有限责任公司 | New energy rapid frequency response device and method |
| CN113629678A (en) * | 2021-07-30 | 2021-11-09 | 珠海格力电器股份有限公司 | Protection device and method of direct current controller and direct current controller |
| CN113904316A (en) * | 2021-10-27 | 2022-01-07 | 江苏嘉擎信息技术有限公司 | Input power supply protection circuit for mainboard equipment |
| WO2023246727A1 (en) * | 2022-06-21 | 2023-12-28 | 华为技术有限公司 | Earphone assembly |
-
2019
- 2019-01-26 CN CN201920150032.8U patent/CN209462021U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113078661A (en) * | 2021-05-19 | 2021-07-06 | 广东电网有限责任公司 | New energy rapid frequency response device and method |
| CN113629678A (en) * | 2021-07-30 | 2021-11-09 | 珠海格力电器股份有限公司 | Protection device and method of direct current controller and direct current controller |
| CN113629678B (en) * | 2021-07-30 | 2022-05-27 | 珠海格力电器股份有限公司 | Protection device and method of direct current controller and direct current controller |
| CN113904316A (en) * | 2021-10-27 | 2022-01-07 | 江苏嘉擎信息技术有限公司 | Input power supply protection circuit for mainboard equipment |
| CN113904316B (en) * | 2021-10-27 | 2023-11-21 | 江苏嘉擎信息技术有限公司 | Input power supply protection circuit for main board equipment |
| WO2023246727A1 (en) * | 2022-06-21 | 2023-12-28 | 华为技术有限公司 | Earphone assembly |
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