CN206250815U - USB charge power supplies with overcurrent protection - Google Patents
USB charge power supplies with overcurrent protection Download PDFInfo
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- CN206250815U CN206250815U CN201621395609.4U CN201621395609U CN206250815U CN 206250815 U CN206250815 U CN 206250815U CN 201621395609 U CN201621395609 U CN 201621395609U CN 206250815 U CN206250815 U CN 206250815U
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Abstract
The utility model proposes a kind of USB charge power supplies with overcurrent protection; it includes input rectifying filter circuit, electric power management circuit, transformer circuit and output circuit; the output circuit includes source of stable pressure U2, overcurrent protection sub-circuit, photoelectrical coupler U4 and an at least USB interface; the overcurrent protection sub-circuit includes an a comparator U3B, at least sampling resistor Rs and at least divider resistance Rd, and each USB interface corresponds to an a sampling resistor Rs and divider resistance Rd respectively；When certain road USB detects the output current of USB interface by sampling resistor Rs and divider resistance Rd; when certain road USB output overcurrents; compare U3B output low levels; over-current signal is fed back into power supply chip; power supply chip adjusts output current accordingly; so as to keep the stabilization of output current, overcurrent protection effect is reached.
Description
Technical field
The utility model is related to power technique fields, more particularly to a kind of USB charge power supplies with overcurrent protection.
Background technology
Because energy-saving and environmental protection, it is efficient the advantages of, USB charge power supplies are widely used to various electric equipment products.At present, market
On there are many mouthfuls of USB chargers, i.e., be provided with two or more USB interfaces on one charger, wherein each USB
Mouth is all independent to carry current foldback circuit, and when USB port quantity is more, excessive independent protection circuit causes the interior of charge power supply
Portion's circuit becomes complicated.
Utility model content
In view of this, it is necessary to which a kind of USB charge power supplies with overcurrent protection are provided, many mouthfuls of USB charging electricity can be simplified
The circuit structure in source, good overcurrent protection effect can be reached by simple circuit structure.
A kind of USB charge power supplies with overcurrent protection, it includes：Input rectifying filter circuit, electric power management circuit, transformation
Device circuit and output circuit, the output circuit include source of stable pressure U2, overcurrent protection sub-circuit, photoelectrical coupler U4 and at least
USB interface, the transformer circuit includes armature winding, secondary windings and assists winding；
The input of the input rectifying filter circuit is used to access civil power, and the first of the input rectifying filter circuit is defeated
Go out power input and the armature winding first end that end connects the electric power management circuit respectively, the input rectifying filtering
Second output end of circuit is used to be grounded, and the end of the armature winding second connects the output end of the electric power management circuit；
The assists winding first end connects the power input of the electric power management circuit, the end of the assists winding second
For being grounded；
The secondary windings first end connects the 4th contact, the electricity of the source of stable pressure of an at least USB interface respectively
The earth terminal difference of the first input end of source and the photoelectrical coupler U4, the end of the secondary windings second and the source of stable pressure
For being grounded；
The overcurrent protection sub-circuit includes comparator U3B, electric capacity C6, resistance R14, resistance R15, resistance R16, at least one
Sampling resistor Rs and at least a divider resistance Rd, sampling resistor Rs and the quantity of divider resistance Rd and the quantity of USB interface are identical,
Each USB interface corresponds to an a sampling resistor Rs and divider resistance Rd respectively；The inverting input of the comparator U3B passes through institute
The first contact of an at least USB interface described at least divider resistance Rd connections is stated, the inverting input of the comparator U3B is also
The output end of the comparator U3B is connected by the resistance R16 for the connecting and electric capacity C6, the comparator U3B's is same
Phase input connects the reference voltage output terminal of the source of stable pressure U2 by the resistance R14, and the comparator U3B's is same mutually defeated
Enter end to be also grounded by the resistance R15, the output end of the comparator U3B connects second input of the photoelectrical coupler U4
End, the first input end of the photoelectrical coupler U4 connects the secondary windings first end, and the end of the secondary windings second is used for
Ground connection, first output end of the photoelectrical coupler U4 connects the feedback end of the electric power management circuit, the photoelectrical coupler
Second output end of U4 is used to be grounded.
Wherein in one embodiment, an at least USB interface includes interface USB1 and interface USB2, described at least one
Sampling resistor Rs include sampling resistor Rs1 and sampling resistor Rs2, an at least divider resistance Rd include divider resistance Rd1 and
Divider resistance Rd2；
First contact of the interface USB1 connects the anti-phase input of the comparator U3B by the divider resistance Rd1
End, first contact of the interface USB1 is also grounded by the sampling resistor Rs1；
First contact of the interface USB2 connects the anti-phase input of the comparator U3B by the divider resistance Rd2
End, first contact of the interface USB2 is also grounded by the sampling resistor Rs2；
4th contact of the interface USB1 and the 4th contact of the interface USB1 connect the secondary windings respectively
One end.
Wherein in one embodiment, an at least USB interface also includes interface USB3 and interface USB4, it is described at least
One sampling resistor Rs also includes that sampling resistor Rs3 and sampling resistor Rs4, an at least divider resistance Rd also include divider resistance
Rd3 and divider resistance Rd4；
First contact of the interface USB3 connects the anti-phase input of the comparator U3B by the divider resistance Rd1
End, first contact of the interface USB3 is also grounded by the sampling resistor Rs1；
First contact of the interface USB4 connects the anti-phase input of the comparator U3B by the divider resistance Rd2
End, first contact of the interface USB4 is also grounded by the sampling resistor Rs2；
4th contact of the interface USB3 and the 4th contact of the interface USB4 connect the secondary windings respectively
One end.
Wherein in one embodiment, the output circuit also includes constant voltage circuit, and the constant voltage circuit includes comparator
U3A, diode D9, resistance R11, resistance R12, resistance R13 and resistance R17；
The in-phase input end of the comparator U3A connects the secondary windings first end, the ratio by the resistance R13
In-phase input end compared with device U3A is also connected with the power end of the source of stable pressure, and the inverting input of the comparator U3A is by described
Resistance R12 connects the earth terminal of the source of stable pressure, and the inverting input of the comparator U3A is also by the resistance of series connection
The R17 and electric capacity C7 connects the output end of the comparator U3A, and the output end of the comparator U3A connects the diode
The negative electrode of D9, the anode of the diode D9 connects second input of the photoelectrical coupler U4.
Wherein in one embodiment, the output circuit also includes diode D8 and electrochemical capacitor C5, the diode
The anode of D8 connects the secondary windings first end, and the negative electrode of the diode D8 is connecting the electrochemical capacitor C5 just respectively
First input of pole, the 4th contact of an at least USB interface, the power end of the source of stable pressure and the photoelectrical coupler U4
End, the negative pole of the electrochemical capacitor C5 is used to be grounded.
Wherein in one embodiment, the electric power management circuit includes power supply chip U1, resistance R1, resistance R4 to resistance
R9, diode D6, electrochemical capacitor C3, electric capacity C4 and switching tube Q1；
The power pins of the power supply chip U1 connect the first of the input rectifying filter circuit by the resistance R1
Output end, the power pins of the power supply chip U1 also connect the negative electrode of the diode D6, described two by the resistance R4
The anode of pole pipe D6 connects the first end of the assists winding, and the feedback pin of the power supply chip U1 is connected by the resistance R9
First output end of the photoelectrical coupler U4 is connect, the output pin of the power supply chip U1 connects described by the resistance R5
The grid of switching tube Q1, the current detecting pin of the power supply chip U1 connects the electric capacity C4 first ends, the power supply chip
The current detecting pin of U1 also connects the drain electrode of the switching tube Q1 and the resistance R7 first ends respectively by the resistance R6,
The timing pin of the power supply chip U1 connects the resistance R8 first ends, the grounding pin of the power supply chip U1, the electricity
Resistance R7 second ends, the ends of resistance R8 second and the ends of electric capacity C4 second are respectively used to ground connection.
Wherein in one embodiment, the transformer circuit also resistance R2 including diode D5, electric capacity C2 and series connection
With resistance R3；
Resistance R2 and resistance R3 one end of the series connection connect the first output end of the input rectifying filter circuit respectively
With the end of the armature winding second, the negative electrode of resistance R2 and resistance the R3 other end connection diode D5 of the series connection, institute
The anode for stating diode D5 connects the end of armature winding second；
The resistance R2 and resistance R3 connected described in the electric capacity C2 are in parallel with the electric capacity C2.
Wherein in one embodiment, the input rectifying filter circuit includes common mode inductance LF1, rectifier bridge BD1 and electricity
Hold C1, wherein：
The first input end of the common mode inductance LF1 is used to connect live wire, and second input of the common mode inductance LF1 is used
In connection zero line, second output end of first output end of the common mode inductance LF1 and the common mode inductance LF1 connects institute respectively
State the first input end of rectifier bridge BD1 and second input of the rectifier bridge BD1, first output end of the rectifier bridge BD1
The power input and the armature winding first end of the electric power management circuit, the second of the rectifier bridge BD1 are connected respectively
Output end is used to be grounded.
Wherein in one embodiment, the USB charge power supplies also including fuse F1, the common mode inductance LF1 the
One input is used to connect live wire by the fuse F1.
Wherein in one embodiment, the USB charge power supplies also include piezo-resistance VR1, the piezo-resistance VR1's
Two ends connect the first input end of the common mode inductance LF1 and second input of the common mode inductance LF1 respectively.
The above-mentioned USB charge power supplies with overcurrent protection, multiple USB interfaces share an overcurrent protection sub-circuit, can simplify
The many mouthfuls of circuit structures of USB charge power supplies, can reach good overcurrent protection effect, with stronger by simple circuit structure
Industrial applicibility.
Brief description of the drawings
In order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, the accompanying drawing of other embodiment can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the USB charge power supplies with overcurrent protection of an embodiment；
Fig. 2 is the partial circuit diagram of the USB charge power supplies with overcurrent protection of an embodiment；
Fig. 3 is the circuit diagram of the USB charge power supplies with overcurrent protection of an embodiment.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and implementation
Example, is further elaborated to the utility model.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.
In description of the present utility model, it is to be understood that term " first ", " second " are only used for describing purpose, and
It is not intended that indicating or implying relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define
At least one this feature can be expressed or be implicitly included to the feature of " first ", " second ".In description of the present utility model,
" multiple " is meant that at least two, such as two, three etc., unless otherwise expressly limited specifically.
The USB charge power supplies with overcurrent protection according to the utility model embodiment are described below in conjunction with the accompanying drawings.For example, this
The USB charge power supplies with overcurrent protection of the embodiment of utility model one include：Input rectifying filter circuit, electric power management circuit,
Transformer circuit and output circuit, output circuit include source of stable pressure U2, overcurrent protection sub-circuit, photoelectrical coupler U4 and at least
USB interface, transformer circuit includes armature winding, secondary windings and assists winding；The input of input rectifying filter circuit is used
In civil power is accessed, the first output end of input rectifying filter circuit connects the power input and primary of electric power management circuit respectively
Winding first end, the second output end of input rectifying filter circuit is used to be grounded, the end of armature winding second connection power management electricity
The output end on road；Assists winding first end connects the power input of electric power management circuit, and the end of assists winding second is used to be grounded；
Secondary windings first end is respectively connecting to the 4th contact, the power end of source of stable pressure and the photoelectrical coupler U4's of a few USB interface
The earth terminal of first input end, the end of secondary windings second and source of stable pressure is respectively used to ground connection；Overcurrent protection sub-circuit includes comparing
Device U3B, electric capacity C6, resistance R14, resistance R15, at least a resistance R16, sampling resistor Rs and an at least divider resistance Rd, sampling
The quantity of resistance Rs and divider resistance Rd is identical with the quantity of USB interface, each USB interface respectively correspond to a sampling resistor Rs and
One divider resistance Rd；The inverting input of comparator U3B connects the first of an at least USB interface by an at least divider resistance Rd
Contact, the inverting input of comparator U3B also connects the output end of comparator U3B by the resistance R16 and electric capacity C6 that connect, than
In-phase input end compared with device U3B connects the reference voltage output terminal of source of stable pressure U2 by resistance R14, and comparator U3B's is same mutually defeated
Enter end to be also grounded by resistance R15, second input of the output end connection photoelectrical coupler U4 of comparator U3B, photoelectric coupling
The first input end connection secondary windings first end of device U4, the end of secondary windings second is used to be grounded, and the first of photoelectrical coupler U4
Output end connects the feedback end of electric power management circuit, and second output end of photoelectrical coupler U4 is used to be grounded.
For example, as shown in figure 1, the USB charge power supplies 10 with overcurrent protection of an embodiment, including：Input rectifying is filtered
The input of circuit 11, electric power management circuit 12, transformer circuit 13 and output circuit 14, wherein input rectifying filter circuit is used
In civil power is accessed, such as input rectifying filter circuit includes two inputs, is respectively used to connect live wire and zero line.Input rectifying
First output end of filter circuit connects the primary side of electric power management circuit and transformer circuit, input rectifying filter circuit respectively
The second output end be used to be grounded, such as by chassics earth, and for example, USB charge power supplies also to include casing, and the casing is used
In by a capacity earth.Input rectifying filter circuit is used to carry out rectifying and wave-filtering treatment to the civil power being input into, and civil power is changed
It is direct current.
Wherein, transformer includes armature winding, secondary windings and assists winding, armature winding first end connection input rectifying
First output end of filter circuit, the end of armature winding second connects the output end of electric power management circuit, and assists winding first end connects
The power input of electric power management circuit is connect, the end of assists winding second is used to be grounded, one end connection output circuit of secondary windings,
The other end is used to be grounded.
In the present embodiment, output circuit includes source of stable pressure U2, overcurrent protection sub-circuit 141, photoelectrical coupler U4 and extremely
A few USB interface, wherein overcurrent protection sub-circuit 141 include comparator U3B, electric capacity C6, resistance R14, resistance R15, resistance
R16, at least a sampling resistor Rs and at least a divider resistance Rd, the quantity and USB interface of sampling resistor Rs and divider resistance Rd
Quantity it is identical, each USB interface respectively correspond to an a sampling resistor Rs and divider resistance Rd；The anti-phase input of comparator U3B
End connects the first contact of an at least USB interface by an at least divider resistance Rd, and the inverting input of comparator U3B also passes through
The output end of resistance R16 and electric capacity C6 connection the comparator U3B of series connection, the in-phase input end of comparator U3B is connected by resistance R14
The reference voltage output terminal of source of stable pressure U2 is connect, the in-phase input end of comparator U3B is also grounded by resistance R15, comparator U3B's
Second input of output end connection photoelectrical coupler U4, the first input end connection secondary windings first of photoelectrical coupler U4
End, the end of secondary windings second is used to be grounded, and first output end of photoelectrical coupler U4 connects the feedback end of electric power management circuit, light
Second output end of electric coupler U4 is used to be grounded.
In one embodiment, output circuit also includes that diode D10, diode D10 are connected to the output of comparator U3B
Between end and second input of photoelectrical coupler U4, the negative electrode of the output end connection diode D10 of such as comparator U3B, two
Second input of the anode connection photoelectrical coupler U4 of pole pipe D10.
Wherein, resistance R14 and resistance R15 is used to set first reference voltage of comparator U3B.The ginseng of source of stable pressure U3 outputs
After voltage is examined through resistance R14 and resistance R15 partial pressures, reference voltage is given to comparator U3 in-phase input ends, the electricity of each USB port
Stream flows through respective sampling resistor, and when the electric current of certain road USB exceedes over-current protection point, the pressure drop on the road sampling resistor surpasses
Reference voltage is crossed, protection is realized in comparator action.For example, when certain road USB output overcurrents, comparing U3B output low levels, light
The input of electric coupler U4 is lighted, the output end conducting of photoelectrical coupler U4, and over-current signal is fed back into power supply chip, power supply
Chip adjusts output current accordingly, so as to keep the stabilization of output current, reaches overcurrent protection effect.
The above-mentioned USB charge power supplies with overcurrent protection, multiple USB interfaces share an overcurrent protection sub-circuit, can simplify
The many mouthfuls of circuit structures of USB charge power supplies, can reach good overcurrent protection effect, with stronger by simple circuit structure
Industrial applicibility.
Wherein in one embodiment, as a example by including two USB interfaces, an at least USB interface include interface USB1 and
Interface USB2, at least a sampling resistor Rs include that sampling resistor Rs1 and sampling resistor Rs2, at least a divider resistance Rd include dividing
Piezoresistance Rd1 and divider resistance Rd2；First contact of interface USB1 connects the anti-phase defeated of comparator U3B by divider resistance Rd1
Enter end, first contact of interface USB1 is also grounded by sampling resistor Rs1；First contact of interface USB2 passes through divider resistance
The inverting input of Rd2 connection comparators U3B, first contact of interface USB2 is also grounded by sampling resistor Rs2；Interface USB1
The 4th contact and the 4th contact of interface USB1 connect secondary windings first end respectively.
Wherein in one embodiment, as a example by including four USB interfaces, as shown in Fig. 2 at least a USB interface is also wrapped
Interface USB3 and interface USB4 is included, an at least sampling resistor Rs also includes sampling resistor Rs3 and sampling resistor Rs4, at least one point
Piezoresistance Rd also includes divider resistance Rd3 and divider resistance Rd4；First contact of interface USB3 is connected by divider resistance Rd1
The inverting input of comparator U3B, first contact of interface USB3 is also grounded by sampling resistor Rs1；The first of interface USB4
Contact connects the inverting input of comparator U3B by divider resistance Rd2, and first contact of interface USB4 also passes through sampling resistor
Rs2 is grounded；4th contact of interface USB3 and the 4th contact of interface USB4 connect secondary windings first end respectively.
Wherein in one embodiment, output circuit also includes constant voltage circuit, as shown in figure 3, constant voltage circuit includes comparing
Device U3A, diode D9, resistance R11, resistance R12, resistance R13 and resistance R17；The in-phase input end of comparator U3A passes through resistance
R13 connects secondary windings first end, and the in-phase input end of comparator U3A is also connected with the power end of source of stable pressure, and comparator U3A's is anti-
Phase input connects the earth terminal of source of stable pressure by resistance R12, and the inverting input of comparator U3A is also by the resistance of series connection
The output end of R17 and electric capacity C7 connection comparators U3A, the negative electrode of the output end connection diode D9 of comparator U3A, diode D9
Anode connection photoelectrical coupler U4 the second input.
In the present embodiment, the reference voltage of source of stable pressure U2 as comparator U3A in-phase input ends the second reference voltage, than
Reverse inter-input-ing voltage compared with device U3A is obtained by the output voltage V+ of charge power supply by resistance R11 and resistance R12 partial pressures.When than
When reverse inter-input-ing voltage compared with device U3A is more than the second reference voltage, comparator U3A output low levels, photoelectrical coupler U4's is defeated
Enter end to light, output voltage is fed back to power supply chip by the output end conducting of photoelectrical coupler U4, and power supply chip is accordingly to output
Voltage is adjusted, so as to keep the stabilization that output is pressed.
Wherein, diode D9 and diode D10 are respectively used to protect the output voltage quilt of comparator U3A and comparator U3B
Drag down.For example, when comparator U3A exports low level, comparator U3B output high level, due to the one-way conduction of diode D10
Characteristic, can avoid the output end voltage of comparator U3B from being pulled low.And for example, when when comparator U3A outputs high level, comparator
During U3B output low levels, due to the one-way conduction characteristic of diode D9, the output end voltage of comparator U3A can be avoided from being drawn
It is low.
In one embodiment, output circuit also includes diode D8 and electrochemical capacitor C5, and the anode of diode D8 is connected
Secondary windings first end, the negative electrode of diode D8 connects the positive pole of electrochemical capacitor C5, the 4th of an at least USB interface the touches respectively
The first input end of point, the power end of source of stable pressure and photoelectrical coupler U4, the negative pole of electrochemical capacitor C5 is used to be grounded.Wherein, two
Pole pipe D5 is used to export rectification, and electrochemical capacitor C5 is used for the filtering of output end.
Wherein in one embodiment, as shown in figure 3, electric power management circuit 12 includes power supply chip U1, resistance R1, resistance
R4 to resistance R9, diode D6, electrochemical capacitor C3, electric capacity C4 and switching tube Q1；The power pins of power supply chip U1 pass through resistance
R1 connects the first output end of input rectifying filter circuit, and the power pins of power supply chip U1 also connect diode by resistance R4
The negative electrode of D6, the anode of diode D6 connects the first end of assists winding, and the feedback pin of power supply chip U1 is connected by resistance R9
First output end of photoelectrical coupler U4 is connect, the output pin of power supply chip U1 passes through the grid of resistance R5 connecting valve pipes Q1,
The current detecting pin connection electric capacity C4 first ends of power supply chip U1, the current detecting pin of power supply chip U1 also passes through resistance R6
The drain electrode of difference connecting valve pipe Q1 and resistance R7 first ends, the timing pin connection resistance R8 first ends of power supply chip U1, electricity
The grounding pin of source chip U1, the ends of resistance R7 second, the ends of resistance R8 second and the ends of electric capacity C4 second are respectively used to ground connection.
Wherein in one embodiment, as shown in figure 3, transformer circuit also includes diode D5, electric capacity C2 and series connection
Resistance R2 and resistance R3；The resistance R2 and resistance R3 one end for wherein connecting connect the first output of input rectifying filter circuit respectively
End and the end of armature winding second, the negative electrode of resistance R2 and resistance the R3 other end connection diode D5 of series connection, the sun of diode D5
Pole connection armature winding second end；The resistance R2 and resistance R3 of electric capacity C2 series connection are in parallel with electric capacity C2.
Wherein in one embodiment, as shown in figure 3, input rectifying filter circuit includes common mode inductance LF1, rectifier bridge
BD1 and electric capacity C1, the wherein first input end of common mode inductance LF1 are used to connect live wire, and second input of common mode inductance LF1 is used
In connection zero line, first output end of common mode inductance LF1 and second output end of common mode inductance LF1 connect rectifier bridge BD1 respectively
First input end and rectifier bridge BD1 the second input, first output end of rectifier bridge BD1 connects electric power management circuit respectively
Power input and armature winding first end, second output end of rectifier bridge BD1 is used to be grounded.
For example, common mode inductance LF1 includes first coil and the second coil, the first input end of common mode inductance LF1 and second
Input is respectively one end of first coil and one end of the second coil, first output end of common mode inductance LF1 and the second output
End is respectively the other end of first coil and the other end of the second coil.
In the present embodiment, common mode inductance LF1 is used to filter the common mode disturbances of input, and rectifier bridge BD1 is used for civil power is whole
Flow for direct current is exported, electric capacity C1 is used to filter the noise jamming after rectification.
Wherein in one embodiment, in order to lift the security of charge power supply, as shown in figure 3, USB charge power supplies are also wrapped
Fuse F1 is included, the first input end of common mode inductance LF1 is used to connect live wire by fuse F1.So, once charge power supply
Occur abnormal, temperature is too high, and fuse F1 then fuses, by charge power supply with exchange electrically disconnected, to realize protecting.
Wherein in one embodiment, USB charge power supplies also include piezo-resistance VR1, and the two ends of piezo-resistance VR1 are distinguished
The first input end of connection common mode inductance LF1 and second input of common mode inductance LF1.Piezo-resistance VR1 can absorb input
The surge current at end, prevents surge current from being damaged to charge power supply.
It should be noted that when element is referred to as " being fixed on " another element, it can directly on another element
Or can also there is element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or may be simultaneously present centering elements.Term as used herein " vertical ", " level ", " left side ",
For illustrative purposes only, it is unique implementation method to be not offered as " right side " and similar statement.
Each technical characteristic of above example can be combined arbitrarily, to make description succinct, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics do not exist lance
Shield, is all considered to be the scope of this specification record.
Above example only expresses several embodiments of the present utility model, and its description is more specific and detailed, but simultaneously
Therefore the limitation to utility model patent scope can not be interpreted as.It should be pointed out that for the ordinary skill people of this area
For member, without departing from the concept of the premise utility, various modifications and improvements can be made, these belong to this reality
With new protection domain.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of USB charge power supplies with overcurrent protection, it is characterised in that including：Input rectifying filter circuit, power management electricity
Road, transformer circuit and output circuit, the output circuit include source of stable pressure U2, overcurrent protection sub-circuit, photoelectrical coupler U4
And an at least USB interface, the transformer circuit include armature winding, secondary windings and assists winding；
The input of the input rectifying filter circuit is used to access civil power, the first output end of the input rectifying filter circuit
The power input and the armature winding first end of the electric power management circuit, the input rectifying filter circuit are connected respectively
The second output end be used to be grounded, the end of the armature winding second connects the output end of the electric power management circuit；
The assists winding first end connects the power input of the electric power management circuit, and the end of the assists winding second is used for
Ground connection；
The secondary windings first end connects the 4th contact, the power end of the source of stable pressure of an at least USB interface respectively
And the first input end of the photoelectrical coupler U4, the earth terminal of the end of the secondary windings second and the source of stable pressure is respectively used to
Ground connection；
The overcurrent protection sub-circuit includes comparator U3B, electric capacity C6, resistance R14, resistance R15, resistance R16, at least one sampling
Resistance Rs and at least a divider resistance Rd, sampling resistor Rs and the quantity of divider resistance Rd and the quantity of USB interface are identical, each
USB interface corresponds to an a sampling resistor Rs and divider resistance Rd respectively；The inverting input of the comparator U3B by it is described extremely
First contact of an at least USB interface described in few divider resistance Rd connections, the inverting input of the comparator U3B also passes through
The resistance R16 and the electric capacity C6 of series connection connect the output end of the comparator U3B, and the comparator U3B's is same mutually defeated
Enter the reference voltage output terminal that end connects the source of stable pressure U2 by the resistance R14, the in-phase input end of the comparator U3B
Also it is grounded by the resistance R15, the output end of the comparator U3B connects second input of the photoelectrical coupler U4,
The first input end of the photoelectrical coupler U4 connects the secondary windings first end, and the end of the secondary windings second is used to connect
Ground, first output end of the photoelectrical coupler U4 connects the feedback end of the electric power management circuit, the photoelectrical coupler U4
The second output end be used for be grounded.
2. USB charge power supplies as claimed in claim 1, it is characterised in that an at least USB interface include interface USB1 and
Interface USB2, an at least sampling resistor Rs include sampling resistor Rs1 and sampling resistor Rs2, an at least divider resistance
Rd includes divider resistance Rd1 and divider resistance Rd2；
First contact of the interface USB1 connects the inverting input of the comparator U3B, institute by the divider resistance Rd1
The first contact for stating interface USB1 is also grounded by the sampling resistor Rs1；
First contact of the interface USB2 connects the inverting input of the comparator U3B, institute by the divider resistance Rd2
The first contact for stating interface USB2 is also grounded by the sampling resistor Rs2；
4th contact of the interface USB1 and the 4th contact of the interface USB1 connect the secondary windings first end respectively.
3. USB charge power supplies as claimed in claim 2, it is characterised in that an at least USB interface also includes interface USB3
And interface USB4, an at least sampling resistor Rs also include sampling resistor Rs3 and sampling resistor Rs4, an at least partial pressure
Resistance Rd also includes divider resistance Rd3 and divider resistance Rd4；
First contact of the interface USB3 connects the inverting input of the comparator U3B, institute by the divider resistance Rd1
The first contact for stating interface USB3 is also grounded by the sampling resistor Rs1；
First contact of the interface USB4 connects the inverting input of the comparator U3B, institute by the divider resistance Rd2
The first contact for stating interface USB4 is also grounded by the sampling resistor Rs2；
4th contact of the interface USB3 and the 4th contact of the interface USB4 connect the secondary windings first end respectively.
4. USB charge power supplies as claimed in claim 1, it is characterised in that the output circuit also includes constant voltage circuit, described
Constant voltage circuit includes comparator U3A, diode D9, resistance R11, resistance R12, resistance R13 and resistance R17；
The in-phase input end of the comparator U3A connects the secondary windings first end, the comparator by the resistance R13
The in-phase input end of U3A is also connected with the power end of the source of stable pressure, and the inverting input of the comparator U3A passes through the resistance
R12 connects the earth terminal of the source of stable pressure, the inverting input of the comparator U3A also by the resistance R17 that connects and
The electric capacity C7 connects the output end of the comparator U3A, and the output end of the comparator U3A connects the moon of the diode D9
Pole, the anode of the diode D9 connects second input of the photoelectrical coupler U4.
5. USB charge power supplies as claimed in claim 1, it is characterised in that the output circuit also includes diode D8 and electricity
The anode of solution electric capacity C5, the diode D8 connects the secondary windings first end, and the negative electrode of the diode D8 is connected respectively
The positive pole of the electrochemical capacitor C5, the 4th contact of an at least USB interface, the power end of the source of stable pressure and the photoelectricity
The first input end of coupler U4, the negative pole of the electrochemical capacitor C5 is used to be grounded.
6. USB charge power supplies according to claim 1, it is characterised in that the electric power management circuit includes power supply chip
U1, resistance R1, resistance R4 are to resistance R9, diode D6, electrochemical capacitor C3, electric capacity C4 and switching tube Q1；
The power pins of the power supply chip U1 connect the first output of the input rectifying filter circuit by the resistance R1
End, the power pins of the power supply chip U1 also connect the negative electrode of the diode D6, the diode by the resistance R4
The anode of D6 connects the first end of the assists winding, and the feedback pin of the power supply chip U1 connects institute by the resistance R9
First output end of photoelectrical coupler U4 is stated, the output pin of the power supply chip U1 connects the switch by the resistance R5
The grid of pipe Q1, the current detecting pin of the power supply chip U1 connects the electric capacity C4 first ends, the power supply chip U1's
Current detecting pin also connects the drain electrode of the switching tube Q1 and the resistance R7 first ends respectively by the resistance R6, described
The timing pin of power supply chip U1 connects the resistance R8 first ends, the grounding pin of the power supply chip U1, the resistance R7
Second end, the ends of resistance R8 second and the ends of electric capacity C4 second are respectively used to ground connection.
7. USB charge power supplies as claimed in claim 1, it is characterised in that the transformer circuit also includes diode D5, electricity
Hold the resistance R2 and resistance R3 of C2 and series connection；
Resistance R2 and resistance R3 one end of the series connection connect the first output end and the institute of the input rectifying filter circuit respectively
The end of armature winding second is stated, resistance R2 and resistance the R3 other end of the series connection connect the negative electrode of the diode D5, described two
The anode of pole pipe D5 connects the end of armature winding second；
The resistance R2 and resistance R3 connected described in the electric capacity C2 are in parallel with the electric capacity C2.
8. USB charge power supplies as claimed in claim 1, it is characterised in that the input rectifying filter circuit includes common mode electricity
Sense LF1, rectifier bridge BD1 and electric capacity C1, wherein：
The first input end of the common mode inductance LF1 is used to connect live wire, and second input of the common mode inductance LF1 is used to connect
Second output end of connecting to neutral line, first output end of the common mode inductance LF1 and the common mode inductance LF1 connects described whole respectively
The first input end of stream bridge BD1 and second input of the rectifier bridge BD1, the first output end difference of the rectifier bridge BD1
Connect the power input and the armature winding first end of the electric power management circuit, second output of the rectifier bridge BD1
Hold for being grounded.
9. USB charge power supplies as claimed in claim 8, it is characterised in that the USB charge power supplies also include fuse F1,
The first input end of the common mode inductance LF1 is used to connect live wire by the fuse F1.
10. USB charge power supplies as claimed in claim 8, it is characterised in that the USB charge power supplies also include piezo-resistance
The two ends of VR1, the piezo-resistance VR1 connect the first input end and the common mode inductance LF1 of the common mode inductance LF1 respectively
The second input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621395609.4U CN206250815U (en) | 2016-12-19 | 2016-12-19 | USB charge power supplies with overcurrent protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621395609.4U CN206250815U (en) | 2016-12-19 | 2016-12-19 | USB charge power supplies with overcurrent protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206250815U true CN206250815U (en) | 2017-06-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621395609.4U Expired - Fee Related CN206250815U (en) | 2016-12-19 | 2016-12-19 | USB charge power supplies with overcurrent protection |
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| Country | Link |
|---|---|
| CN (1) | CN206250815U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114268159A (en) * | 2022-01-19 | 2022-04-01 | 南斗六星系统集成有限公司 | High-reliability vehicle-mounted USB charging product supporting precise current-limiting control |
-
2016
- 2016-12-19 CN CN201621395609.4U patent/CN206250815U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114268159A (en) * | 2022-01-19 | 2022-04-01 | 南斗六星系统集成有限公司 | High-reliability vehicle-mounted USB charging product supporting precise current-limiting control |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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