CN207705815U - The mobile power circuit of small-capacity cells full charge electricity can be achieved - Google Patents
The mobile power circuit of small-capacity cells full charge electricity can be achieved Download PDFInfo
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- CN207705815U CN207705815U CN201721417697.8U CN201721417697U CN207705815U CN 207705815 U CN207705815 U CN 207705815U CN 201721417697 U CN201721417697 U CN 201721417697U CN 207705815 U CN207705815 U CN 207705815U
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Abstract
The utility model discloses a kind of mobile power circuits of achievable small-capacity cells full charge electricity comprising：Charging circuit, a USB interface, the USB interface are additionally provided with a jumper terminal that can be contacted with metal shell in USB plug, a load detecting circuit are provided between charging circuit current output terminal and jumper terminal；There are one resistance such as R39 for ground terminal series connection, a resistance R40 are in series between metal shell and the signal return terminal of charging circuit, and metal shell is connected with ground terminal, a capacitance C27 is parallel between resistance R39 and resistance R39.There are one jumper terminals for setting on the USB interface that the electric current of mobile power charging circuit exports for the utility model, detect whether be connected with load on USB interface by the jumper terminal.As long as be connected with load on USB interface, charging circuit will be constantly in charged state, even if charging current has fallen to the degree for the electric current that a microcontroller is unable to monitor, it can ensure that small-capacity cells can persistently charge to saturation under low current intensity in this way.
Description
Technical field：
The utility model is related to mobile power field of circuit technology, refer in particular to a kind of shifting of achievable small-capacity cells full charge electricity
Dynamic power circuit.
Background technology：
With the development of science and technology, increasingly be unableing to do without mobile electronic device in people’s lives and work.Simultaneously as moving
The limited battery capacity of dynamic electronic equipment, for the ease of charging to mobile electronic device, mobile power generates therewith.
Current mobile power can be divided into two kinds according to circuit degree of intelligence：One is pure circuit design, the mobile powers
Circuit in there is no microcontroller to participate in control, charging output current exports always the electric currents of 120-200uA sizes, even waits for
It is also in this way, will result in the waste of electricity in this way under machine state.One kind being the increase in monolithic processor controlled circuit, this circuit
In can detect load, when detecting that output end connects with load, the output circuit of circuit is started to work, to load output current.
As rechargeable battery is gradually saturated in load, charging current is also gradually reduced, when output current is less than 50mA, microcontroller at this time
Due to the temperature of accuracy of detection, whether microcontroller None- identified also has load output, and microcontroller would be at dormant state at this time,
Charging circuit is stopped.In this case, for general mobile electronic device (such as can only mobile phone, tablet electricity
Brain etc.), since the capacity of its battery is larger, when the charging circuit output current of mobile power is less than 50mA, electricity is usual
It can be full of.But with for the mobile electronic device of some low capacities, since its battery capacity is small, original charging current
With regard to very little, so when mobile power charging circuit output current is less than 50mA, battery also underfill, but in mobile power
Circuit microcontroller that identify, will enter dormant state, lead to the mobile electronic device battery of this low capacity
Charging does not reach saturation.The cruise duration that will result in mobile electronic device in this way is shortened, and also affects mobile electricity
The service life of battery in sub- equipment.
Therefore the present inventor improves by continuous, proposes following technical scheme, designing one kind can be full to small-capacity cells
The mobile power circuit of charging.
Utility model content：
Technical problem to be solved in the utility model, which is that, is further improved prior art, provides
A kind of mobile power circuit of achievable small-capacity cells full charge electricity.
In order to solve the above-mentioned technical problem, the utility model uses following technical proposals：Small-capacity cells can be achieved in this
The mobile power circuit of full charge electricity, including：By monolithic processor controlled mobile power charging circuit, the power supply of the charging circuit is defeated
Outlet is a USB interface, which includes：Power output terminal, two data transfer terminals, ground terminals, and cladding
Metal shell outside aforementioned four terminal, the metal shell enclose the interface moulding for being set as docking with USB plug, the USB
Interface is additionally provided with a jumper terminal that can be contacted with metal shell in USB plug, the charging circuit current output terminal with
A load detecting circuit is provided between jumper terminal；There are one resistance such as R39, the metals for the ground terminal series connection
A resistance R40 is in series between shell and the signal return terminal of charging circuit, and metal shell is connected with ground terminal, resistance
A capacitance C27 is parallel between R39 and resistance R39.
Furthermore, in above-mentioned technical proposal, the load detecting circuit include two concatenated resistance R26 and
R38。
Furthermore, in above-mentioned technical proposal, the jumper terminal has elastic contact part, when USB interface and USB
When plug docks, the elastic contact part of jumper terminal is contacted with the metal shell in USB plug, the metal shell in USB plugs
It is contacted with the metal shell of USB interface, the metal shell of USB interface is enabled to be connected with jumper terminal.
After adopting the above technical scheme, the utility model is on the USB interface that the electric current of mobile power charging circuit exports
There are one jumper terminals for setting, detect whether be connected with load on USB interface by the jumper terminal.If do not connected negative
It carries, then charging circuit can be constantly in dormant state, save the electricity of mobile power.When detect be connected on USB interface it is negative
When load, charging circuit opens output circuit, charges, and is gradually filled with even as load end-cell, charging current drops to
When 50-60mA, charging circuit still carries out always low current charge, is extracted by USB interface until that will load.So, as long as
When being connected with load on USB interface, charging circuit will be constantly in charged state, even if charging current has fallen to a list
The degree for the electric current that piece machine is unable to monitor can ensure that small-capacity cells can persistently charge under low current intensity in this way
Saturation.
Description of the drawings：
Fig. 1 is the circuit diagram of the utility model；
Fig. 2 is the schematic diagram of USB interface and USB plug mated condition in the utility model；
Specific implementation mode：
The utility model is further illustrated with reference to specific embodiments and the drawings.
See Fig. 1, shown in 2, the utility model is a kind of mobile power circuit of achievable small-capacity cells full charge electricity, is wrapped
It includes：By monolithic processor controlled mobile power charging circuit 1, the power output end of the charging circuit 1 is a USB interface 2.Charging
Charging current of the circuit 1 through overprotection circuit, the backward 2 output 5V of USB interfaces of reduction voltage circuit (figure is to show).
USB interface 2 is using conventional USB interface design comprising：21, two data transfer terminals of power output terminal
22,23, ground terminal 24, and the metal shell 20 that is coated on outside aforementioned four terminal, which, which encloses, is set as and USB
The interface moulding of plug docking.
The utility model with conventional USB interface the difference is that, USB interface 2 described in the utility model is additionally provided with
One jumper terminal 25 that can be contacted with metal shell 40 in USB plug 4.As shown in Fig. 2, the jumper terminal 25 has elasticity
Contact site, when USB interface 2 is docked with USB plug 4, outside the elastic contact part of jumper terminal 25 and the metal in USB plug 4
Shell 40 contacts, and the metal shell 40 in USB plug 4 is contacted with the metal shell 20 of USB interface 2, enables the metal-back of USB interface 2
Body 20 is connected with jumper terminal 25.I.e. after USB interface 2 is connect with load (USB plug 4), jumper terminal 25 will be with metal
Shell 20 connects.
A load detecting circuit 3 is provided between 1 current output terminal of charging circuit and jumper terminal 25.
It is grounded after one resistance R39 of the series connection of ground terminal 24, the letter of the metal shell 20 and charging circuit 1
It is in series with a resistance R40 between number return terminal I-AD, and metal shell 20 is connected with ground terminal 24, resistance R39 and resistance
A capacitance C27 is parallel between R39.
The load detecting circuit 3 includes two concatenated resistance R26 and R38.
The operation principle of the utility model is as follows：
When USB interface 20 is not connected with load, that is, when being not inserted into USB plug 4, opened if starting charging circuit 1
It closes.The ends B+ in circuit are detected by load detecting circuit 3 first, in load detecting circuit 3 electric current by R26, R38 with
Jumper terminal 25 connects, and jumper terminal 25 is off at this time, defeated after the electric resistance partial pressure in load detecting circuit 3
Go out high level to the detection foot of charging circuit 1, the microcontroller in charging circuit 1 will judge to be not necessarily to charging at this time, will not start
Charging circuit, in a dormant state, to save energy consumption.
When USB interface 20 and load connect, that is, are inserted into USB plug 4, if starting the switch of charging circuit 1.At this time
After USB plug 4 is inserted into USB interface 2, the metal shell 40 of USB plug 4 will be contacted with the elastic contact part of jumper terminal 25, and two
Person realizes and connects.Meanwhile metal shell 40 is also in close contact with metal shell 20 at this time, so jumper terminal 25 will connect with USB
The metal shell 20 of mouth 2 connects.Since the ground terminal 24 in USB interfaces 2 passes through the metal shell 20 of A points and USB interface 2
It connects, while A points are grounded by resistance R39, this is equivalent to jumper terminal 25 and is connected by metal shell 20 and A points.Output electricity
Stream B+ is connected to A points by R26, R38, jumper terminal 25 in load detecting circuit 3, and it is low level to enable the ends PG, i.e., through overload
After electric resistance partial pressure in detection circuit 3, the detection foot of output low level to charging circuit 1, the microcontroller in charging circuit 1 will
Judgement needs to charge at this time, to start charging circuit, starts to charge up.
The utility model has the advantage of as long as being inserted with USB plug 4 in USB interface 2, charging circuit 1 will export always
Charging current can ensure that small in this way even if charging current has fallen to the degree for the electric current that a microcontroller is unable to monitor
Capacity batteries can persistently charge to saturation under low current intensity.
Certainly, it is not to implement to limit the utility model the foregoing is merely specific embodiment of the utility model
Range, it is all according to the equivalent change or modification that structure, feature and principle is done described in present utility model application the scope of the claims, it should all wrap
It includes in present utility model application the scope of the claims.
Claims (3)
1. it can realize the mobile power circuit of small-capacity cells full charge electricity, including：It is charged by monolithic processor controlled mobile power
The power output end of circuit (1), the charging circuit (1) is a USB interface (2), which includes：Power output terminal
(21), two data transfer terminals (22,23), ground terminals (24), and the metal shell that is coated on outside aforementioned four terminal
(20), which encloses the interface moulding for being set as docking with USB plug, it is characterised in that：
The USB interface (2) is additionally provided with a jumper terminal (25) that can be contacted with metal shell in USB plug, described
A load detecting circuit (3) is provided between charging circuit (1) current output terminal and jumper terminal (25)；
There are one resistance such as R39, the letters of the metal shell (20) and charging circuit (1) for ground terminal (24) series connection
It is in series with a resistance R40 between number return terminal, and metal shell (20) is connected with ground terminal (24), resistance R39 and resistance R39
Between be parallel with a capacitance C27.
2. the mobile power circuit of achievable small-capacity cells full charge electricity according to claim 1, it is characterised in that：It is described
Load detecting circuit (3) include two concatenated resistance R26 and R38.
3. the mobile power circuit of achievable small-capacity cells full charge electricity according to claim 1, it is characterised in that：It is described
Jumper terminal (25) have elastic contact part, when USB interface (2) is docked with USB plug, the elastic connecting of jumper terminal (25)
Contact portion is contacted with the metal shell in USB plug, and the metal shell (20) of the metal shell in USB plug and USB interface (2) connects
It touches, the metal shell (20) of USB interface (2) is enabled to be connected with jumper terminal (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721417697.8U CN207705815U (en) | 2017-10-30 | 2017-10-30 | The mobile power circuit of small-capacity cells full charge electricity can be achieved |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721417697.8U CN207705815U (en) | 2017-10-30 | 2017-10-30 | The mobile power circuit of small-capacity cells full charge electricity can be achieved |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207705815U true CN207705815U (en) | 2018-08-07 |
Family
ID=63021636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721417697.8U Active CN207705815U (en) | 2017-10-30 | 2017-10-30 | The mobile power circuit of small-capacity cells full charge electricity can be achieved |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207705815U (en) |
-
2017
- 2017-10-30 CN CN201721417697.8U patent/CN207705815U/en active Active
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