CN110429679A - A kind of small electricity charging equipment and control method - Google Patents
A kind of small electricity charging equipment and control method Download PDFInfo
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- CN110429679A CN110429679A CN201910734139.1A CN201910734139A CN110429679A CN 110429679 A CN110429679 A CN 110429679A CN 201910734139 A CN201910734139 A CN 201910734139A CN 110429679 A CN110429679 A CN 110429679A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The present invention provides a kind of small electricity charging equipment, the small electricity charging equipment includes: connector, and micro-control unit, three metal-oxide-semiconductors, the resistance of a 100K Ω rank, the resistance of a Ω rank, three pull-up resistors, three are used as the triode of on-off action.5V direct current can be supplied electricity to small-sized rechargeable battery safe and efficiently and charged by equipment of the invention, the present invention be suitable for battery capacity it is small in the case where, the electric current of resistance and metal-oxide-semiconductor can control in reliable range.When the present invention is turned on and off with metal-oxide-semiconductor, by the difference of the size of current after parasitic diode and conducting, charging current is controlled in conjunction with resistance current limliting；ADC value is read by micro-control unit, and the opening of metal-oxide-semiconductor is controlled by GPIO, closes the control to realize charging.It when voltage is lower, is charged using lesser electric current, the excessive damage caused by battery of electric current is avoided, to extend the service life of battery.
Description
Technical field
The present invention relates to charging equipment technical fields, more particularly, to a kind of small electricity charging equipment and control method.
Background technique
Be capable of the rechargeable battery of Reusability, it is long using the time, be used for a long time it is low in cost, and from environmental protection and energy saving angle
It sees, advantageously than common batteries, therefore, rechargeable battery is widely used rechargeable battery.Battery charging is pair
Rechargeable battery supplements the process of electricity, and principle is that direct current is allowed to pass through from opposite direction of discharging, so that the work in battery
Property substance restitution.The charging of battery usually damages health and the service life of battery in various electronic equipments, lacks one kind at present
It is safe and efficient that the equipment that miniature rechargeable battery charges is supplied electricity to by 5V direct current.
Summary of the invention
It is existing to solve the problems, such as the purpose of the present invention is to provide a kind of small electricity charging equipment and its control method.
In order to achieve the above object, the present invention provides a kind of small electricity charging equipment, the small electricity charging equipment packets
Include connector, micro-control unit, the first metal-oxide-semiconductor, third metal-oxide-semiconductor, first resistor, 3rd resistor and the 5th resistance；The connection
Device connects direct current, and the connector is connected to the pole D of third metal-oxide-semiconductor；The micro-control unit is comprising a no less than ADC and not
Less than two GPIO, ADC connection rechargeable battery+pole, the pole G of GPIO1 the first metal-oxide-semiconductor of connection, the 3rd MOS of GPIO3 connection
The pole G of pipe；There is parasitic diode, the pole S of the first metal-oxide-semiconductor and third metal-oxide-semiconductor links together inside the third metal-oxide-semiconductor；
One end of the first resistor is connect with the pole D of the first metal-oxide-semiconductor, and the other end of the first resistor is connected to rechargeable battery
+ pole；The 3rd resistor is connected between the pole S of the first metal-oxide-semiconductor and the pole G；5th resistance is connected to the S of third metal-oxide-semiconductor
Between pole and the pole G.
Further, the small electricity charging equipment further includes the second metal-oxide-semiconductor, second resistance and the 4th resistance, described micro-
Control unit includes ADC and three GPIO, the pole G of GPIO2 the second metal-oxide-semiconductor of connection, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor and the
The pole S of three metal-oxide-semiconductors links together, and the resistance value of the second resistance is less than first resistor, one end of the second resistance with
The pole D of second metal-oxide-semiconductor connects, the other end and first resistor of the second resistance be commonly connected to rechargeable battery+pole, institute
The 4th resistance is stated to be connected between the pole S of the second metal-oxide-semiconductor and the pole G.
Further, the small electricity charging equipment further includes first switch, second switch and third switch, first switch
It is connected between GPIO1 and the pole D of the first metal-oxide-semiconductor, second switch is connected between GPIO2 and the pole D of the second metal-oxide-semiconductor, third
Switch is connected between GPIO3 and the pole D of third metal-oxide-semiconductor.
Further, first switch, second switch and third switch are triode.
Further, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor and third metal-oxide-semiconductor are P-MOS pipe.
Further, 3rd resistor, the 4th resistance and the 5th resistance are pull-up resistor.
Further, the resistance value of first resistor is 100~1000K Ω, and the resistance value of second resistance is 1~10 Ω.
Further, the connector connects 5V direct current.
The present invention also provides a kind of control method of small electricity charging equipment, the control method be micro-control unit according to
The voltage value of rechargeable battery selects the stage below:
(1) initial stage
Micro-control unit controls GPIO1 exports low level, closes the first metal-oxide-semiconductor, and GPIO3 exports high level, charges at this time
It closes；
(2) minimum current charging phase
Micro-control unit controls GPIO1 exports high level, opens the first metal-oxide-semiconductor, and GPIO3 exports high level, opens third
Metal-oxide-semiconductor；
(3) the large current charge stage
Micro-control unit controls GPIO1 exports low level, closes the first metal-oxide-semiconductor, and GPIO3 exports high level, opens third
Metal-oxide-semiconductor；
(4) charging terminates
Micro-control unit controls GPIO1 exports low level, closes the first metal-oxide-semiconductor, and GPIO3 exports high level, charging flow
Terminate.
Further, the control method is micro-control unit according to the voltage value of rechargeable battery selection rank below
Section:
(1) initial stage
Micro-control unit controls GPIO1 exports low level, closes the first metal-oxide-semiconductor, and GPIO2 exports low level, closes second
Metal-oxide-semiconductor, GPIO3 export low level, and charging is closed at this time；
(2) minimum current charging phase
Micro-control unit controls GPIO1 exports high level, opens the first metal-oxide-semiconductor, and GPIO2 exports low level, closes second
Metal-oxide-semiconductor, GPIO3 export high level, open third metal-oxide-semiconductor；
(3) the low current charge stage
Micro-control unit controls GPIO1 exports low level, closes the first metal-oxide-semiconductor, and GPIO2 exports high level, opens second
Metal-oxide-semiconductor, GPIO3 export low level；
(4) the large current charge stage
Micro-control unit controls GPIO1 exports low level, closes the first metal-oxide-semiconductor, and GPIO2 exports high level, opens second
Metal-oxide-semiconductor, GPIO3 export high level, open third metal-oxide-semiconductor；
(5) charging terminates
Micro-control unit controls GPIO1 exports low level, closes the first metal-oxide-semiconductor, and GPIO2 exports low level, closes second
Metal-oxide-semiconductor, GPIO3 export high level, and charging flow terminates.
Further, it is minimum current charging phase when cell voltage < 2V, is small electricity when 2V≤cell voltage < 3.5V
In the current charge stage, be the large current charge stage when 3.5V≤cell voltage < 4.2V, and charging terminates when cell voltage >=4.2V.
Further, micro-control unit reads the voltage of rechargeable battery by ADC, exports low electricity every 10s, GPIO1
Flat, GPIO2 exports high level, and the time continues 1s, and in this 1s, micro-control unit reads tertiary voltage, cell voltage by ADC
Value is average value three times.
In conclusion by adopting the above-described technical solution, compared with prior art, the present invention having following beneficial to effect
Fruit:
5V direct current can be supplied electricity to small-sized rechargeable battery safe and efficiently and charged by equipment of the invention, and the present invention is suitable
For battery capacity it is small in the case where, the electric current of resistance and metal-oxide-semiconductor can control in reliable range.The present invention uses MOS
When pipe is turned on and off, by the difference of the size of current after parasitic diode and conducting, controlled in conjunction with resistance current limliting
Charging current；ADC value is read by micro-control unit, and the opening of metal-oxide-semiconductor is controlled by GPIO, closes the control to realize charging
System.It when voltage is lower, is charged using lesser electric current, avoids the excessive damage caused by battery of electric current, from
And extend the service life of battery.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the small electricity charging equipment of embodiment one；
Fig. 2 is the flow diagram of the small electricity charging equipment of embodiment one.
Fig. 3 is the structural schematic diagram of the small electricity charging equipment of embodiment two.
The reference numerals are as follows:
1, connector, 2, micro-control unit, 3, first resistor, 4, second resistance, 5,3rd resistor, the 6, the 4th resistance, 7,
5th resistance, the 8, first metal-oxide-semiconductor, the 9, second metal-oxide-semiconductor, 10, third metal-oxide-semiconductor, 11, first switch, 12, second switch, 13, third
Switch, 14, rechargeable battery.
Specific embodiment
A specific embodiment of the invention is described in more detail below in conjunction with schematic diagram.According to following description,
Advantages and features of the invention will become apparent from.It should be noted that attached drawing is all made of very simplified form and using non-accurate
Ratio, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.
In the description of the present invention, it is to be understood that, term " longitudinal direction ", " radial direction ", " length ", " width ", " thickness ",
The orientation of the instructions such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" or
Positional relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplification of the description, without
It is that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore not
It can be interpreted as limitation of the present invention.In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or two
More than, the meaning of " at least two " is also two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection ", " contact " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the present invention.
When the embodiment of the present invention refers to the ordinal numbers such as " first ", " second ", unless based on context its express really it is suitable
The meaning of sequence, it should be understood that only play differentiation and be used.
Embodiment one
Fig. 1, a kind of small electricity charging equipment are please referred to, the small electricity charging equipment includes: connector 1, microcontroller list
Member 2, first resistor 3, second resistance 4,3rd resistor 5, the 4th resistance 6, the 5th resistance 7, the first metal-oxide-semiconductor 8, the second metal-oxide-semiconductor 9,
Third metal-oxide-semiconductor 10, first switch 11, second switch 12 and third switch 13.
Connector 1 have 2 interfaces, wherein 1pin connect 5V+pole, 3pin ground connection.The 1pin of connector 1 is connected to third
The pole D of metal-oxide-semiconductor 10.
Micro-control unit 2 includes ADC and three GPIO, ADC connection rechargeable battery 14+pole, GPIO1 connection the
The base stage of one switch 11, the base stage of GPIO2 connection second switch 12, the base stage of GPIO3 connection third switch 13.
One end of first resistor 3 is connect with the pole D of the first metal-oxide-semiconductor 8, and the other end and second resistance 4 of first resistor 3 are common
Be connected to rechargeable battery 14+pole.
One end of second resistance 4 is connect with the pole D of the second metal-oxide-semiconductor 8, and the other end and first resistor 3 of second resistance 4 are common
Be connected to rechargeable battery 14+pole.
3rd resistor 5, the 4th resistance 6 and the 5th resistance 7 are pull-up resistor.3rd resistor 5 is connected to the S of the first metal-oxide-semiconductor 8
Between pole and the pole G, the 4th resistance 6 is connected between the pole S and the pole G of the second metal-oxide-semiconductor 9, and the 5th resistance 7 is connected to third metal-oxide-semiconductor
Between 10 pole S and the pole G.
First metal-oxide-semiconductor 8, the second metal-oxide-semiconductor 9 and third metal-oxide-semiconductor 10 are P-MOS pipe, have the pole D, the pole S and the pole G.First MOS
The pole S of pipe 8, the second metal-oxide-semiconductor 9 and third metal-oxide-semiconductor 10 links together.The pole G of first metal-oxide-semiconductor 8 and the current collection of first switch 11
Pole connection, the pole G of the second metal-oxide-semiconductor 9 are connect with the collector of second switch 12, have parasitic diode inside third metal-oxide-semiconductor 10,
The pole G of third metal-oxide-semiconductor 10 is connect with the collector of third switch 13.
First switch 11, second switch 12 and third switch 13 are the triode as on-off action, are NPN in attached drawing 1
Type triode.The emitter of first switch 11, second switch 12 and third switch 13 is grounded.
When GPIO1, GPIO2 export high level, the first metal-oxide-semiconductor 8, the second metal-oxide-semiconductor 9 can be opened；When GPIO1,
When GPIO2 output is low level, the first metal-oxide-semiconductor 8, the second metal-oxide-semiconductor 9 are closed.Third metal-oxide-semiconductor 10 is because there are parasitic two poles in inside
Pipe can not close when GPIO3 output is low level, when GPIO3 exports high level, the pole D of third metal-oxide-semiconductor 10 and S
Impedance can reduce between pole, by electric current can become larger.
Referring to figure 2.
Micro-control unit 2 reads the voltage of rechargeable battery 14 by ADC pin, because in the presence of rechargeable battery 14
Resistance, cannot read while charging, and not so voltage can float height, so reading the mode of cell voltage are as follows: every 10s, GPIO1
Low level is exported, GPIO2 exports high level, and the time continues 1s；In this 1s, micro-control unit 2 goes to read electric three times by ADC
Pressure, battery voltage value are average value three times.The micro-control unit 2 selects following close according to the voltage value of rechargeable battery 14
The suitable stage:
(1) initial stage
Micro-control unit 2 controls GPIO1 and exports low level, closes the first metal-oxide-semiconductor 8；GPIO2 exports low level, closes the
Two metal-oxide-semiconductors 9；GPIO3 exports high level, and the charging of rechargeable battery 14 at this time is closed.
(2) minimum current charging phase (when cell voltage < 2V)
GPIO1 exports high level at this time, opens the first metal-oxide-semiconductor 8；GPIO2 exports low level, closes the second metal-oxide-semiconductor 9；
GPIO3 exports high level, opens third metal-oxide-semiconductor 10.
Charging current at this time is (5V-VBAT)/R1；Wherein, VBAT is cell voltage, and R1 is the resistance of first resistor 3
Value.The size for guaranteeing first resistor 3 is 100K Ω rank, and charging current can be made to be maintained at μ A rank, be at this time minimum electric current
Charging guarantees that battery will not damage when extremely low voltage.
(3) low current charge stage (when 2V≤cell voltage < 3.5V)
GPIO1 exports low level at this time, closes the first metal-oxide-semiconductor 8；GPIO2 exports high level, opens the second metal-oxide-semiconductor 9；
GPIO3 exports low level, reduces the electric current for flowing through third metal-oxide-semiconductor 10, electric current can be by parasitic diode at this time, but electric current can become
It is small.
Charging current at this time is (5V-VDQ3-VBAT)/R2；Wherein, VBAT is cell voltage, and VDQ3 is third metal-oxide-semiconductor
10 parasitic diode both end voltage, R2 are the resistance value of second resistance 4.As cell voltage is got higher, electric current can be smaller and smaller,
The size for guaranteeing second resistance 4 is ohm rank, and charging current can be made to keep mA rank, guaranteed at this time small in cell voltage
When can use lower electric current charge, be the low current charge stage.
(4) large current charge stage (when 3.5V≤cell voltage < 4.2V)
GPIO1 exports low level at this time, closes the first metal-oxide-semiconductor 8；GPIO2 exports high level, opens the second metal-oxide-semiconductor 9；
GPIO3 exports high level, opens third metal-oxide-semiconductor 10.
Charging current at this time is (5V-VBAT)/R2；Wherein, VBAT is cell voltage, and R2 is the resistance of second resistance 4
Value.The size for guaranteeing second resistance 4 is ohm rank, and charging current can be made to keep mA rank；It is at this time normal charging condition,
Electric current at this time is significantly greater than the low current charge stage, and as cell voltage is got higher, electric current can be smaller and smaller.
(5) charging terminates (when cell voltage >=4.2V)
GPIO1 exports low level, closes the first metal-oxide-semiconductor 8；GPIO2 exports low level, closes the second metal-oxide-semiconductor 9；GPIO3 is defeated
High level out；Battery charging at this time is closed, and charging flow terminates.
The small electricity charging equipment of the present embodiment is turned on and off with metal-oxide-semiconductor, after parasitic diode and conducting
Size of current difference, control charging current in conjunction with resistance current limliting, safe and efficiently can supply electricity to 5V direct current small-sized
Rechargeable battery charging.In cell voltage < 2V, is charged using the minimum electric current of μ A rank, it is excessive to electricity to avoid electric current
It is damaged caused by pond.In 2V≤cell voltage < 3.5V, using the low current charge of mA rank, electric current antipode low current fills
The electric stage is obviously improved, but electric current it is not too big cause damage battery.In 3.5V≤cell voltage < 4.2V, electric current is relatively small
Current charging phase is further promoted, and accelerates charging rate.The small electricity charging equipment of the present embodiment uses difference stage by stage
The electric current of size charges, and when voltage is lower, is charged using lesser electric current, avoids that electric current is excessive to make battery
At damage, to extend the service life of battery.
Embodiment two
Referring to figure 3., a kind of small electricity charging equipment, the small electricity charging equipment include: connector 1, microcontroller list
Member 2, first resistor 3,3rd resistor 5, the 5th resistance 7, the first metal-oxide-semiconductor 8, third metal-oxide-semiconductor 10, first switch 11 and third switch
13。
Connector 1 have 2 interfaces, wherein 1pin connect 5V+pole, 3pin ground connection.The 1pin of connector 1 is connected to third
The pole D of metal-oxide-semiconductor 10.
Micro-control unit 2 includes ADC and two GPIO, ADC connection rechargeable battery 14+pole, GPIO1 connection the
The base stage of one switch 11, the base stage of GPIO3 connection third switch 13.
One end of first resistor 3 is connect with the pole D of the first metal-oxide-semiconductor 8, and the other end of first resistor 3 is connected to chargeable electricity
Pond 14+pole.
3rd resistor 5 and the 5th resistance 7 are pull-up resistor.3rd resistor 5 be connected to the first metal-oxide-semiconductor 8 the pole S and the pole G it
Between, the 5th resistance 7 is connected between the pole S of third metal-oxide-semiconductor 10 and the pole G.
First metal-oxide-semiconductor 8 and third metal-oxide-semiconductor 10 are P-MOS pipe, have the pole D, the pole S and the pole G.First metal-oxide-semiconductor 8 and the 3rd MOS
The pole S of pipe 10 links together.The pole G of first metal-oxide-semiconductor 8 is connect with the collector of first switch 11, is had inside third metal-oxide-semiconductor 10
There is parasitic diode, the pole G of third metal-oxide-semiconductor 10 is connect with the collector of third switch 13.
First switch 11 and third switch 13 are the triode as on-off action, first switch 11 and third switch 13
Emitter ground connection.
The micro-control unit 2 selects the following suitable stage according to the voltage value of rechargeable battery 14:
(1) initial stage
Micro-control unit 2 controls GPIO1 and exports low level, closes the first metal-oxide-semiconductor 8；GPIO3 exports high level, at this time may be used
The charging of rechargeable battery 14 is closed.
(2) minimum current charging phase
GPIO1 exports high level at this time, opens the first metal-oxide-semiconductor 8；GPIO3 exports high level, opens third metal-oxide-semiconductor 10.
(3) the large current charge stage
GPIO1 exports low level at this time, closes the first metal-oxide-semiconductor 8；GPIO3 exports high level, opens third metal-oxide-semiconductor 10.
(4) charging terminates
GPIO1 exports low level, closes the first metal-oxide-semiconductor 8；GPIO3 exports high level；Battery charging at this time is closed, charging
Process terminates.
The small electricity charging equipment of the present embodiment is turned on and off with metal-oxide-semiconductor, after parasitic diode and conducting
Size of current difference, control charging current in conjunction with resistance current limliting, small-sized chargeable electricity can be given safe and efficiently
Pond charging.The small electricity charging equipment of the present embodiment is charged using different size of electric current stage by stage, when voltage is lower,
It is charged using lesser electric current, the excessive damage caused by battery of electric current is avoided, to extend the service life of battery.
The above is only a preferred embodiment of the present invention, does not play the role of any restrictions to the present invention.Belonging to any
Those skilled in the art, in the range of not departing from technical solution of the present invention, to the invention discloses technical solution and
Technology contents make the variation such as any type of equivalent replacement or modification, belong to the content without departing from technical solution of the present invention, still
Within belonging to the scope of protection of the present invention.
Claims (12)
1. a kind of small electricity charging equipment, which is characterized in that the small electricity charging equipment includes:
Connector, the connector connect direct current, and the connector is connected to the pole D of third metal-oxide-semiconductor；
Micro-control unit, the micro-control unit include that no less than an ADC and no less than two GPIO, ADC connection are chargeable
Battery+pole, the pole G of GPIO1 the first metal-oxide-semiconductor of connection, the pole G of GPIO3 connection third metal-oxide-semiconductor；
First metal-oxide-semiconductor；
Third metal-oxide-semiconductor, has parasitic diode inside the third metal-oxide-semiconductor, and the pole S of the first metal-oxide-semiconductor and third metal-oxide-semiconductor is connected to
Together；
First resistor, one end of the first resistor are connect with the pole D of the first metal-oxide-semiconductor, the other end connection of the first resistor
To rechargeable battery+pole；
3rd resistor, the 3rd resistor are connected between the pole S of the first metal-oxide-semiconductor and the pole G；
5th resistance, the 5th resistance are connected between the pole S of third metal-oxide-semiconductor and the pole G.
2. small electricity charging equipment according to claim 1, which is characterized in that the small electricity charging equipment further includes
Two metal-oxide-semiconductors, second resistance and the 4th resistance, the micro-control unit include ADC and three GPIO, GPIO2 connection second
The pole S of the pole G of metal-oxide-semiconductor, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor and third metal-oxide-semiconductor links together, the resistance value of the second resistance
Less than first resistor, one end of the second resistance is connect with the pole D of the second metal-oxide-semiconductor, the other end of the second resistance and
One resistance be commonly connected to rechargeable battery+pole, the 4th resistance is connected between the pole S of the second metal-oxide-semiconductor and the pole G.
3. small electricity charging equipment according to claim 2, which is characterized in that the small electricity charging equipment further includes
One switch, second switch and third switch, the first switch are connected between GPIO1 and the pole G of the first metal-oxide-semiconductor, and second opens
Pass is connected between GPIO2 and the pole G of the second metal-oxide-semiconductor, and third switch is connected between GPIO3 and the pole G of third metal-oxide-semiconductor.
4. small electricity charging equipment according to claim 3, which is characterized in that first switch, second switch and third are opened
Closing is triode.
5. small electricity charging equipment according to claim 2, which is characterized in that the first metal-oxide-semiconductor, the second metal-oxide-semiconductor and third
Metal-oxide-semiconductor is P-MOS pipe.
6. small electricity charging equipment according to claim 2, which is characterized in that 3rd resistor, the 4th resistance and the 5th electricity
Resistance is pull-up resistor.
7. small electricity charging equipment according to claim 2, which is characterized in that the resistance value of first resistor be 100~
1000K Ω, the resistance value of second resistance are 1~10 Ω.
8. small electricity charging equipment according to claim 2, which is characterized in that the connector connects 5V direct current.
9. the control method of small electricity charging equipment according to claim 1, which is characterized in that the control method is micro-
Control unit selects the stage below according to the voltage value of rechargeable battery:
(1) initial stage
Micro-control unit controls GPIO1 exports low level, closes the first metal-oxide-semiconductor, and GPIO3 exports high level, and charging is closed at this time；
(2) minimum current charging phase
Micro-control unit controls GPIO1 exports high level, opens the first metal-oxide-semiconductor, and GPIO3 exports high level, opens the 3rd MOS
Pipe；
(3) the large current charge stage
Micro-control unit controls GPIO1 exports low level, closes the first metal-oxide-semiconductor, and GPIO3 exports high level, opens the 3rd MOS
Pipe；
(4) charging terminates
Micro-control unit controls GPIO1 exports low level, closes the first metal-oxide-semiconductor, and GPIO3 exports high level, and charging flow terminates.
10. according to the control method of the described in any item small electricity charging equipments of claim 2~8, which is characterized in that the control
Method processed is micro-control unit according to the voltage value of the rechargeable battery selection stage below:
(1) initial stage
Micro-control unit controls GPIO1 exports low level, closes the first metal-oxide-semiconductor, and GPIO2 exports low level, closes the 2nd MOS
Pipe, GPIO3 export high level, and charging is closed at this time；
(2) minimum current charging phase
Micro-control unit controls GPIO1 exports high level, opens the first metal-oxide-semiconductor, and GPIO2 exports low level, closes the 2nd MOS
Pipe, GPIO3 export high level, open third metal-oxide-semiconductor；
(3) the low current charge stage
Micro-control unit controls GPIO1 exports low level, closes the first metal-oxide-semiconductor, and GPIO2 exports high level, opens the 2nd MOS
Pipe, GPIO3 export low level；
(4) the large current charge stage
Micro-control unit controls GPIO1 exports low level, closes the first metal-oxide-semiconductor, and GPIO2 exports high level, opens the 2nd MOS
Pipe, GPIO3 export high level, open third metal-oxide-semiconductor；
(5) charging terminates
Micro-control unit controls GPIO1 exports low level, closes the first metal-oxide-semiconductor, and GPIO2 exports low level, closes the 2nd MOS
Pipe, GPIO3 export high level, and charging flow terminates.
11. control method according to claim 10, which is characterized in that be low current charge rank in pole when cell voltage < 2V
Section, is the low current charge stage when 2V≤cell voltage < 3.5V, and when 3.5V≤cell voltage < 4.2V is large current charge rank
Section, charging terminates when cell voltage >=4.2V.
12. control method according to claim 11, which is characterized in that micro-control unit reads chargeable electricity by ADC
The voltage in pond, every 10s, GPIO1 export low level, GPIO2 exports high level, the time continues 1s, in this 1s, microcontroller list
Member reads tertiary voltage by ADC, and battery voltage value is average value three times.
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