CN105914821A - Mobile power supply, and battery pack control circuit - Google Patents
Mobile power supply, and battery pack control circuit Download PDFInfo
- Publication number
- CN105914821A CN105914821A CN201610303462.XA CN201610303462A CN105914821A CN 105914821 A CN105914821 A CN 105914821A CN 201610303462 A CN201610303462 A CN 201610303462A CN 105914821 A CN105914821 A CN 105914821A
- Authority
- CN
- China
- Prior art keywords
- battery pack
- voltage
- chip microcomputer
- control circuit
- voltage output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- 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
- H02J7/00304—Overcurrent protection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a mobile power supply, and a battery pack control circuit. The control circuit comprises a current input terminal in pluggable connection with an external power source; a battery pack comprising a plurality of cascade batteries; a single chip microcomputer comprising a plurality of first analog-to-digital conversion terminals which are respectively connected to the anode and cathode of a battery pack, and between each two adjacent batteries; a first PMOS pipe having the drain electrode connected to the current input terminal, and the grid electrode connected to the first control voltage output terminal of the single chip microcomputer; a second PMOS pipe having the drain electrode connected to the current input terminal, and the grid electrode connected to the second control voltage output terminal of the single chip microcomputer; a third PMOS pipe having the drain electrode connected to the anode of the battery pack, the grid electrode connected to the third control voltage output terminal of the single chip microcomputer, and the source electrode connected to the source electrode of the second PMOS pipe; and a current-limiting resistor arranged between the source electrode of the third PMOS pipe and the source electrode of the first PMOS pipe. The control circuit can perform overvoltage protection on the battery pack in a mobile power supply.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to the control of a kind of portable power source and battery pack
Circuit processed.
Background technology
Along with the progress of science and technology, the portable electric appts such as mobile phone, panel computer has been popularized.
But owing to battery capacity is limited, when user goes out overlong time, portable electric appts
Electricity is often not enough to support that user uses.
Therefore the portable power source exclusively for charging portable electronic apparatus arises at the historic moment, and existing
Portable power source, it is necessary in advance it is charged, on the premise of itself has sufficient electricity,
Can charge for portable electric appts.
But the battery capacity within portable power source is the biggest, as can be at thousand of milliamperes to several ten thousand
Between Hao An, prior art lacks the mechanism protecting portable power source internal cell, thus
Cause battery overvoltage, therefore produce the potential safety hazards such as such as spontaneous combustion.
Summary of the invention
The present invention provides the control circuit of a kind of portable power source and battery pack, can be to portable power source inside
Battery carries out overvoltage protection, thus solves above-mentioned technical problem.
The present invention provides the control circuit of a kind of battery pack, is used for controlling battery pack, and battery pack includes
The battery of multiple series connection；Control circuit includes: current input terminal, pluggable with external power supply is connected；
Current input terminal, pluggable with external power supply is connected；Single-chip microcomputer, including multiple first analog-to-digital conversion
End, is connected between the positive pole of battery pack, negative pole and each two adjacent cell；First
PMOS, its drain electrode is connected with current input terminal, and its grid controls voltage with the first of single-chip microcomputer
Output connects；Second PMOS, its drain electrode is connected with current input terminal, its grid and monolithic
Second control voltage output end of machine connects；3rd PMOS, its drain electrode and the positive pole of battery pack
Connecting, its grid is connected with the 3rd control voltage output end of single-chip microcomputer, its source electrode and the 2nd PMOS
The source electrode of pipe connects；Current-limiting resistance, is arranged on source electrode and a PMOS of the 3rd PMOS
Between the source electrode of pipe.
Wherein, when current input terminal is connected with external power supply, it is defeated that single-chip microcomputer controls voltage first
Go out to hold output low level, control voltage output end and the 3rd second and control voltage output end output height
Level.
Wherein, single-chip microcomputer obtains the positive pole of battery pack, negative pole from multiple first analog-to-digital conversion ends respectively
And the magnitude of voltage between each two adjacent cell, thus obtain between the both positive and negative polarity of each battery
Magnitude of voltage, each magnitude of voltage is compared by single-chip microcomputer with preset voltage value scope, if magnitude of voltage surpasses
Go out preset voltage value scope, then control voltage output end at the first control voltage output end and second defeated
Go out low level, control voltage output end output high level the 3rd.
Wherein, control circuit also includes current sense resistor, one end of current sense resistor respectively with
Second analog-to-digital conversion end of single-chip microcomputer and the positive pole of battery pack connect, the other end of current sense resistor
It is connected with the 3rd analog-to-digital conversion end and the earth terminal of single-chip microcomputer respectively.
Wherein, single-chip microcomputer obtains the first voltage from the second analog-to-digital conversion end respectively, turns from the 3rd pattern
Change end and obtain the second voltage, and obtain the total current value of battery pack according to below equation:
I=(V1-V2)/R；Wherein, I is total current value, and V1 is the first voltage, and V2 is the second voltage,
R is the resistance value of current sense resistor.
Wherein, total current value is compared by single-chip microcomputer with pre-set current value scope, if total current value
Beyond pre-set current value scope, then control voltage output end and second first and control voltage output end
Output low level, controls voltage output end output high level the 3rd.
Wherein, control circuit also includes thermistor, and thermistor adheres on battery pack outer surface,
And one end of thermistor is connected with constant voltage source, the of the other end of thermistor and single-chip microcomputer
Four analog-to-digital conversion ends connect.
Wherein, single-chip microcomputer obtains the magnitude of voltage of thermistor from the 3rd patten transformation end, and according to heat
The magnitude of voltage of quick resistance obtains the temperature value of the outer surface of battery pack, and by temperature value and preset temperature
Value scope compares, if temperature value is beyond preset temperature value scope, then the first voltage output end,
Second voltage output end and tertiary voltage output output low level.
Wherein, the quantity of battery pack is many groups, and many Battery packs group is with series, parallel or above two
The combination of person is attached.
The present invention further provides a kind of portable power source, including above-mentioned control circuit.
By such scheme, the invention has the beneficial effects as follows: be different from prior art, the present invention's
By arranging the first PMOS, the second PMOS, the 3rd PMOS at charge path,
And according to the voltage of battery pack, it is opened disconnection and be controlled, can be according to the Control of Voltage of battery pack
Whether battery pack is charged, therefore can realize portable power source internal battery is carried out overvoltage guarantor
Protect.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, embodiment will be retouched below
In stating, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below
It is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying
On the premise of creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.Wherein:
Fig. 1 is the circuit connection diagram signal of the control circuit of the battery pack of the embodiment of the present invention
Figure.
Fig. 2 is the concrete circuit connection diagram of the control circuit of the battery pack of the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical scheme in the embodiment of the present invention
It is clearly and completely described, it is clear that described embodiment is only that a part of the present invention is real
Execute example rather than whole embodiment.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under not making performing creative labour premise, broadly falls into this
The scope of invention protection.
Refer to Fig. 1, Fig. 1 be the embodiment of the present invention battery pack control circuit circuit connect
Schematic diagram schematic diagram.As it is shown in figure 1, the control circuit of the present embodiment is used for controlling battery pack, its
Including current input terminal the 100, first PMOS the 301, second PMOS the 302, the 3rd PMOS
Pipe 303, single-chip microcomputer 10 and current-limiting resistance 407.
Specifically, it is connected as it is shown in figure 1, current input terminal 100 is pluggable with external power supply,
Battery pack includes the battery 201,202,203 of multiple series connection, and single-chip microcomputer 10 includes multiple first mould
Number conversion end 101,102,103, is connected to the positive pole of battery pack, negative pole and each two
Between adjacent cell, the drain electrode of the first PMOS 301 is connected with current input terminal 100, and first
The grid of PMOS 301 is connected with the first control voltage output end 109 of single-chip microcomputer 10, the
The drain electrode of two PMOS 302 is connected with current input terminal 100, the grid of the second PMOS 302
Pole is connected with the second control voltage output end 108 of single-chip microcomputer 10, the 3rd PMOS 303
Drain electrode is connected with the positive pole of battery pack, the of the grid of the 3rd PMOS 303 and single-chip microcomputer 10
Three control voltage output end 107 connects, the source electrode of the 3rd PMOS 303 and the 2nd PMOS
The source electrode of pipe 302 connects, and current-limiting resistance 407 is arranged on the source electrode and the of the 3rd PMOS 303
Between the source electrode of one PMOS 301.
When current input terminal 100 is connected with external power supply, single-chip microcomputer 10 controls voltage first
Output 109 output low level, defeated at the second control voltage output end 108 and the 3rd control voltage
Going out end 107 output high level, now source electrode and the drain electrode of the first PMOS 301 disconnects,
The source electrode of the second PMOS 302 and drain electrode keep connect, the source electrode of the 3rd PMOS 303 and
Drain electrode keeps connecting, and external power supply can pass through the first PMOS 301 and the second PMOS 302
Directly battery pack is carried out large current charge.
Wherein, can arrange whether testing circuit is connected with external power supply with detection current input terminal 100,
Owing to testing circuit is not emphasis of the present invention, therefore do not illustrate at Fig. 1.
In charging process, single-chip microcomputer 10 can respectively from multiple first analog-to-digital conversion ends 101,102,
103 obtain the positive poles of battery pack, magnitude of voltage between negative pole and each two adjacent cell, thus
Obtaining the magnitude of voltage between the both positive and negative polarity of each battery, single-chip microcomputer 10 is by each magnitude of voltage and presets
Range of voltage values compares, if magnitude of voltage is beyond preset voltage value scope, then controls electricity first
Pressure output 109 and second controls voltage output end 108 output low level, controls voltage the 3rd
Output 107 exports high level, thus controls source electrode and the drain electrode disconnection of the first PMOS 301
Connecting, the source electrode and the drain electrode that control the second PMOS 302 disconnect, and control the 3rd PMOS
The source electrode of pipe 303 and drain electrode keep connecting.
Above-mentioned preset voltage value scope can be each battery normal voltage when electricity is full of
Value, in the present embodiment, when the magnitude of voltage of battery is beyond standard voltage value, due to PMOS
Self-characteristic, it can be after source electrode and drain electrode disconnect, it is also possible to allow small area analysis from source electrode
To drain electrode flowing, therefore available first PMOS 301 and the second PMOS 302 are to battery pack
Carry out low discharging current, thus ensure that battery is not at overvoltage condition.
Continuing with seeing Fig. 1, control circuit also includes current sense resistor 406, current detecting electricity
One end of resistance 406 respectively with the second analog-to-digital conversion end 104 and the positive pole of battery pack of single-chip microcomputer 10
Connect, the other end of current sense resistor 406 respectively with the 3rd analog-to-digital conversion end of single-chip microcomputer 10
105 and earth terminal connect.
Wherein, single-chip microcomputer 10 obtains the first voltage from the second analog-to-digital conversion end 104 respectively, from
Three analog-to-digital conversion ends 105 obtain the second voltage, and obtain the total current of battery pack according to below equation
Value: I=(V1-V2)/R；Wherein, I is total current value, and V1 is the first voltage, and V2 is the second electricity
Pressure, R is the resistance value of current sense resistor 406.
Wherein, total current value is compared by single-chip microcomputer 10 with default first current value range, if
Total current value beyond presetting the first current value range, then controls voltage output end 109 and the first
Two control voltage output end 108 output low level, control voltage output end 107 the 3rd and export height
Level.
The first above-mentioned pre-set current value scope can be the battery normalized current when electricity is full of
Value, in the present embodiment, when the magnitude of voltage of battery is beyond standard current value, due to PMOS
Self-characteristic, it can be after source electrode and drain electrode disconnect, it is also possible to allow small area analysis from source electrode
To drain electrode flowing, therefore available first PMOS 301 and the second PMOS 302 are to battery pack
Carry out low discharging current, thus ensure that battery is not at over-current state.
Further, total current value can be compared by single-chip microcomputer 10 with default second current value range
Relatively, if total current value is beyond presetting the second current value range, then voltage output end 109 is controlled first
Control voltage output end 107 with the 3rd and export high level, control voltage output end 108 second defeated
Go out low level.
The now source electrode of the first PMOS 301 and the 3rd PMOS 303 and drain electrode keeps connecting,
Source electrode and the drain electrode of the second PMOS 302 disconnect, and the electric current of external power supply input can pass through
Battery pack is charged, at the present embodiment by the first PMOS 301 and the 3rd PMOS 303
In, the resistance value of current-limiting resistance 407 is set to sufficiently large, so that the electric current of external power supply input
Via the formation trickle that diminishes after current-limiting resistance 407, thus can realize that battery pack is carried out trickle and fill
Electricity.
Significantly, since battery is in charging process, due to its charging current of self-characteristic
Can diminish, above-mentioned the second current value range of presetting is determined by battery charge characteristic curve,
Specifically can choose a concrete current value in characteristic curve to change to tiny stream as from large current charge
The threshold value of current charge.
And continuing with seeing Fig. 1, control circuit also includes thermistor 501, thermistor 501
Adhere on battery pack outer surface, and one end of thermistor 501 is connected with constant voltage source, temperature-sensitive
The other end of resistance 501 is connected with the 4th analog-to-digital conversion end 106 of single-chip microcomputer 10.
Single-chip microcomputer 10 obtains the magnitude of voltage of thermistor 501 from fourth mode end of convert 106, and
Magnitude of voltage according to thermistor 501 obtains the temperature value of the outer surface of battery pack, and by temperature value
Compare with preset temperature value scope, if temperature value is beyond preset temperature value scope, then surface electricity
Pond group temperature is too high, now can control voltage output end 107, second first and control voltage output
End 108 and the 3rd controls voltage output end 109 output low level so that the first PMOS
301, source electrode and the drain electrode of the second PMOS the 302, the 3rd PMOS 303 all disconnects, from
And stop battery pack being carried out discharge and recharge.
In the alternative embodiment of the present invention, the quantity of battery pack is many groups, and many Battery packs group is with string
Connection, in parallel or above combination mode are attached.
Please with further reference to Fig. 2, Fig. 2 illustrates that the concrete circuit of the control circuit of battery pack connects
Relation.
As in figure 2 it is shown, single-chip microcomputer 90 is respectively by current detection circuit 902, voltage detecting electric current
901 are connected with battery pack, and in the present embodiment, battery pack is provided with 4 batteries, is respectively provided with
In P+2, P+1,3P-, P-1_-, P-1 between adjacent pairs.
Circuit 903 is clock circuit, for providing time reference for single-chip microcomputer 90.
Circuit 904 is telecommunication circuit, and single-chip microcomputer 90 is led to external equipment by circuit 904
Letter.
The present invention further provides a kind of portable power source, including above-mentioned control circuit.
To sum up, the present invention by rationally arranging the first PMOS, the 2nd PMOS at charge path
Pipe, the 3rd PMOS, and control each PMOS according to the voltage of battery pack, electric current, state of temperature
Pipe, can control whether to be charged battery pack according to the voltage of battery pack, electric current, temperature, because of
This can realize protecting portable power source internal battery so that it is is in optimum charged state.
The foregoing is only embodiments of the invention, not thereby limit the scope of the claims of the present invention,
Every equivalent structure utilizing description of the invention and accompanying drawing content to be made or equivalence flow process conversion, or
Directly or indirectly being used in other relevant technical fields, the patent being the most in like manner included in the present invention is protected
In the range of protecting.
Claims (10)
1. the control circuit of a battery pack, it is characterised in that be used for controlling battery pack, described electricity
Pond group includes the battery of multiple series connection；Described control circuit includes:
Current input terminal, pluggable with external power supply is connected；
Single-chip microcomputer, including multiple first analog-to-digital conversion ends, be connected to described battery pack positive pole,
Between negative pole and each two adjacent cell；
First PMOS, its drain electrode is connected with described current input terminal, its grid and described monolithic
First control voltage output end of machine connects；
Second PMOS, its drain electrode is connected with described current input terminal, its grid and described monolithic
Second control voltage output end of machine connects；
3rd PMOS, its drain electrode is connected with the positive pole of described battery pack, its grid and described list
3rd control voltage output end of sheet machine connects, and its source electrode connects with the source electrode of described second PMOS
Connect；
Current-limiting resistance, is arranged on the source electrode of described 3rd PMOS and described first PMOS
Between source electrode.
Control circuit the most according to claim 1, it is characterised in that input at described electric current
When end is connected with described external power supply, described single-chip microcomputer controls voltage output end output described first
Low level, controls voltage output end and the described 3rd described second and controls voltage output end output height
Level.
Control circuit the most according to claim 2, it is characterised in that described single-chip microcomputer is respectively
The positive pole of described battery pack, negative pole and each two phase is obtained from multiple described first analog-to-digital conversion ends
Magnitude of voltage between adjacent battery, thus obtain the magnitude of voltage between the both positive and negative polarity of each described battery,
Each described magnitude of voltage is compared by described single-chip microcomputer with preset voltage value scope, if described voltage
Value beyond described preset voltage value scope, then controls voltage output end and described second described first
Control voltage output end output low level, control voltage output end output high level the described 3rd.
Control circuit the most according to claim 2, it is characterised in that also include current detecting
Resistance, one end of described current sense resistor respectively with the second analog-to-digital conversion end of described single-chip microcomputer and
The positive pole of described battery pack connects, the other end of described current sense resistor respectively with described single-chip microcomputer
The 3rd analog-to-digital conversion end and earth terminal connect.
Control circuit the most according to claim 4, it is characterised in that described single-chip microcomputer is respectively
Obtain the first voltage from described second analog-to-digital conversion end, obtain second from described 3rd patten transformation end
Voltage, and the total current value of described battery pack is obtained according to below equation:
I=(V1-V2)/R；
Wherein, I is described total current value, and V1 is described first voltage, and V2 is described second voltage, R
Resistance value for described current sense resistor.
Control circuit the most according to claim 5, it is characterised in that described single-chip microcomputer is by institute
State total current value to compare with pre-set current value scope, if described total current value is preset beyond described
Current value range, then control voltage output end and described second described first and control voltage output end
Output low level, controls voltage output end output high level the described 3rd.
Control circuit the most according to claim 2, it is characterised in that also include thermistor,
Described thermistor adheres on described battery pack outer surface, and one end of described thermistor is with constant
Voltage source connects, and the other end of described thermistor connects with the 4th analog-to-digital conversion end of described single-chip microcomputer
Connect.
Control circuit the most according to claim 7, it is characterised in that described single-chip microcomputer is from institute
State the 3rd patten transformation end and obtain the magnitude of voltage of described thermistor, and according to described thermistor
Magnitude of voltage obtains the temperature value of the outer surface of described battery pack, and by described temperature value and preset temperature
Value scope compares, if described temperature value is beyond described preset temperature value scope, then described the
One voltage output end, described second voltage output end and described tertiary voltage output export low electricity
Flat.
Control circuit the most according to claim 1, it is characterised in that the number of described battery pack
Amount is many groups, and the described battery pack of many groups is carried out with series, parallel or above combination mode
Connect.
10. a portable power source, it is characterised in that include described in any one of claim 1 to 9
Control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610303462.XA CN105914821B (en) | 2016-05-10 | 2016-05-10 | Control circuit of portable power source and group battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610303462.XA CN105914821B (en) | 2016-05-10 | 2016-05-10 | Control circuit of portable power source and group battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105914821A true CN105914821A (en) | 2016-08-31 |
| CN105914821B CN105914821B (en) | 2020-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610303462.XA Active CN105914821B (en) | 2016-05-10 | 2016-05-10 | Control circuit of portable power source and group battery |
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| CN205921400U (en) * | 2016-05-10 | 2017-02-01 | 香港 D & I企业有限公司 | Control circuit of portable power source and group battery |
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| CN101123358A (en) * | 2006-08-10 | 2008-02-13 | 仁宝电脑工业股份有限公司 | Battery module with mixed voltage balance unit and its charging and discharging method |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105914821B (en) | 2020-03-31 |
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