CN105914821B - Control circuit of portable power source and group battery - Google Patents
Control circuit of portable power source and group battery Download PDFInfo
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- CN105914821B CN105914821B CN201610303462.XA CN201610303462A CN105914821B CN 105914821 B CN105914821 B CN 105914821B CN 201610303462 A CN201610303462 A CN 201610303462A CN 105914821 B CN105914821 B CN 105914821B
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- pmos tube
- battery pack
- voltage output
- control voltage
- control circuit
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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
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- 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
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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
- H02J7/00304—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 control circuit of a mobile power supply and a battery pack, which comprises: the current input end is connected with an external power supply in a pluggable manner; a battery pack including a plurality of batteries connected in series; the single chip microcomputer comprises a plurality of first analog-to-digital conversion ends which are respectively connected to the anode and the cathode of the battery pack and between every two adjacent batteries; the drain electrode of the first PMOS tube is connected with the current input end, and the grid electrode of the first PMOS tube is connected with the first control voltage output end of the singlechip; the drain electrode of the second PMOS tube is connected with the current input end, and the grid electrode of the second PMOS tube is connected with the second control voltage output end of the singlechip; the drain electrode of the third PMOS tube is connected with the anode of the battery pack, the grid electrode of the third PMOS tube is connected with the third control voltage output end of the singlechip, and the source electrode of the third PMOS tube is connected with the source electrode of the second PMOS tube; and the current-limiting resistor is arranged between the source electrode of the third PMOS tube and the source electrode of the first PMOS tube. Through the mode, overvoltage protection can be carried out on the battery pack inside the mobile power supply.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a control circuit of a mobile power supply and a battery pack.
Background
With the advancement of science and technology, portable electronic devices such as mobile phones and tablet computers have become popular.
However, due to the limited battery capacity, when the user goes out for a long time, the power of the portable electronic device is often insufficient to support the user.
Therefore, portable power sources specially used for charging portable electronic devices have been developed, and the conventional portable power sources must be charged in advance, so that the portable electronic devices can be charged on the premise that the portable power sources have sufficient electric quantity.
However, the battery capacity inside the mobile power supply is often very large, for example, between several thousand milliamperes and several ten thousand milliamperes, and a mechanism for protecting the battery inside the mobile power supply is absent in the prior art, so that the battery is in overvoltage, and potential safety hazards such as spontaneous combustion are generated.
Disclosure of Invention
The invention provides a mobile power supply and a control circuit of a battery pack, which can perform overvoltage protection on a battery in the mobile power supply, thereby solving the technical problem.
The invention provides a control circuit of a battery pack, which is used for controlling the battery pack, wherein the battery pack comprises a plurality of batteries which are connected in series; the control circuit includes: the current input end is connected with an external power supply in a pluggable manner; the current input end is connected with an external power supply in a pluggable manner; the single chip microcomputer comprises a plurality of first analog-to-digital conversion ends which are respectively connected to the anode and the cathode of the battery pack and between every two adjacent batteries; the drain electrode of the first PMOS tube is connected with the current input end, and the grid electrode of the first PMOS tube is connected with the first control voltage output end of the singlechip; the drain electrode of the second PMOS tube is connected with the current input end, and the grid electrode of the second PMOS tube is connected with the second control voltage output end of the singlechip; the drain electrode of the third PMOS tube is connected with the anode of the battery pack, the grid electrode of the third PMOS tube is connected with the third control voltage output end of the singlechip, and the source electrode of the third PMOS tube is connected with the source electrode of the second PMOS tube; and the current-limiting resistor is arranged between the source electrode of the third PMOS tube and the source electrode of the first PMOS tube.
When the current input end is connected with the external power supply, the single chip microcomputer outputs a low level at the first control voltage output end, and outputs a high level at the second control voltage output end and the third control voltage output end.
The single chip microcomputer obtains the positive electrode and the negative electrode of the battery pack and the voltage value between every two adjacent batteries from the plurality of first analog-to-digital conversion ends respectively so as to obtain the voltage value between the positive electrode and the negative electrode of each battery, compares each voltage value with a preset voltage value range, outputs low level at the first control voltage output end and the second control voltage output end if the voltage value exceeds the preset voltage value range, and outputs high level at the third control voltage output end.
The control circuit further comprises a current detection resistor, one end of the current detection resistor is connected with the second analog-to-digital conversion end of the single chip microcomputer and the anode of the battery pack respectively, and the other end of the current detection resistor is connected with the third analog-to-digital conversion end of the single chip microcomputer and the grounding end of the single chip microcomputer respectively.
The single chip microcomputer obtains a first voltage from the second analog-to-digital conversion end, obtains a second voltage from the third mode conversion end, and obtains a total current value of the battery pack according to the following equation: i ═ V1-V2)/R; wherein, I is the total current value, V1 is the first voltage, V2 is the second voltage, and R is the resistance value of the current detection resistor.
The singlechip compares the total current value with a preset current value range, and if the total current value exceeds the preset current value range, low level is output at the first control voltage output end and the second control voltage output end, and high level is output at the third control voltage output end.
The control circuit further comprises a thermistor, the thermistor is attached to the outer surface of the battery pack, one end of the thermistor is connected with the constant voltage source, and the other end of the thermistor is connected with a fourth analog-to-digital conversion end of the single chip microcomputer.
The single chip microcomputer obtains a voltage value of the thermistor from the third mode conversion end, obtains a temperature value of the outer surface of the battery pack according to the voltage value of the thermistor, compares the temperature value with a preset temperature value range, and outputs low levels at the first voltage output end, the second voltage output end and the third voltage output end if the temperature value exceeds the preset temperature value range.
The number of the battery packs is multiple groups, and the multiple groups of battery packs are connected in series, in parallel or in a combination mode of the two.
The invention further provides a mobile power supply which comprises the control circuit.
Through the scheme, the invention has the beneficial effects that: different from the prior art, the first PMOS tube, the second PMOS tube and the third PMOS tube are arranged in the charging path, and are controlled to be opened or closed according to the voltage of the battery pack, so that whether the battery pack is charged or not can be controlled according to the voltage of the battery pack, and the overvoltage protection of the battery pack inside the mobile power supply can be realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
fig. 1 is a schematic circuit connection diagram of a control circuit of a battery pack according to an embodiment of the present invention.
Fig. 2 is a specific circuit connection diagram of a control circuit of the battery pack according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic circuit connection diagram of a control circuit of a battery pack according to an embodiment of the invention. As shown in fig. 1, the control circuit of the present embodiment is used for controlling a battery pack, and includes a current input terminal 100, a first PMOS transistor 301, a second PMOS transistor 302, a third PMOS transistor 303, a single chip microcomputer 10, and a current limiting resistor 407.
Specifically, as shown in fig. 1, the current input terminal 100 is connected to an external power source in a pluggable manner, the battery pack includes a plurality of batteries 201, 202, and 203 connected in series, the single chip microcomputer 10 includes a plurality of first analog-to- digital conversion terminals 101, 102. 103, respectively connected to the positive electrode and the negative electrode of the battery pack and between every two adjacent batteries, the drain of the first PMOS transistor 301 is connected to the current input terminal 100, the gate of the first PMOS transistor 301 is connected to the first control voltage output terminal 109 of the single chip microcomputer 10, the drain of the second PMOS transistor 302 is connected to the current input terminal 100, the gate of the second PMOS transistor 302 is connected to the second control voltage output terminal 108 of the single chip microcomputer 10, the drain of the third PMOS transistor 303 is connected to the positive electrode of the battery pack, the gate of the third PMOS transistor 303 is connected to the third control voltage output terminal 107 of the single chip microcomputer 10, the source of the third PMOS transistor 303 is connected to the source of the second PMOS transistor 302, and the current limiting resistor 407 is disposed between the source of the third PMOS transistor 303 and the source of the first PMOS transistor 301.
When the current input end 100 is connected with an external power supply, the single chip microcomputer 10 outputs a low level at the first control voltage output end 109 and outputs a high level at the second control voltage output end 108 and the third control voltage output end 107, at this time, the source electrode and the drain electrode of the first PMOS transistor 301 are disconnected, the source electrode and the drain electrode of the second PMOS transistor 302 are kept connected, the source electrode and the drain electrode of the third PMOS transistor 303 are kept connected, and the external power supply can directly charge the battery pack with a large current through the first PMOS transistor 301 and the second PMOS transistor 302.
A detection circuit may be provided to detect whether the current input terminal 100 is connected to an external power source, and is not shown in fig. 1 because the detection circuit is not a key point of the present invention.
During the charging process, the single chip microcomputer 10 may respectively obtain the positive electrode and the negative electrode of the battery pack and a voltage value between every two adjacent batteries from the plurality of first analog-to- digital conversion terminals 101, 102, and 103, so as to obtain a voltage value between the positive electrode and the negative electrode of each battery, the single chip microcomputer 10 compares each voltage value with a preset voltage value range, if the voltage value exceeds the preset voltage value range, a low level is output at the first control voltage output terminal 109 and the second control voltage output terminal 108, and a high level is output at the third control voltage output terminal 107, so as to control the source and the drain of the first PMOS transistor 301 to be disconnected, control the source and the drain of the second PMOS transistor 302 to be disconnected, and control the source and the drain of the third PMOS transistor 303 to be kept connected.
In this embodiment, when the voltage value of the battery exceeds the standard voltage value, due to the characteristics of the PMOS transistor, the PMOS transistor can allow a small current to flow from the source to the drain after the source and the drain are disconnected, so that the first PMOS transistor 301 and the second PMOS transistor 302 can be used to discharge the small current to the battery pack, thereby ensuring that the battery is not in an overvoltage state.
Referring to fig. 1, the control circuit further includes a current detection resistor 406, one end of the current detection resistor 406 is connected to the second analog-to-digital conversion terminal 104 of the single chip microcomputer 10 and the positive electrode of the battery pack, and the other end of the current detection resistor 406 is connected to the third analog-to-digital conversion terminal 105 of the single chip microcomputer 10 and the ground terminal.
The single chip microcomputer 10 obtains the first voltage from the second analog-to-digital conversion terminal 104, obtains the second voltage from the third analog-to-digital conversion terminal 105, and obtains the total current value of the battery pack according to the following equation: i ═ V1-V2)/R; where I is the total current value, V1 is the first voltage, V2 is the second voltage, and R is the resistance of the current detection resistor 406.
The single chip microcomputer 10 compares the total current value with a preset first current value range, and outputs a low level at the first control voltage output terminal 109 and the second control voltage output terminal 108 and a high level at the third control voltage output terminal 107 if the total current value exceeds the preset first current value range.
In this embodiment, when the voltage value of the battery exceeds the standard current value, due to the characteristics of the PMOS transistor, the PMOS transistor can allow a small current to flow from the source to the drain after the source and the drain are disconnected, so that the first PMOS transistor 301 and the second PMOS transistor 302 can be used to discharge the battery pack with a small current, thereby ensuring that the battery is not in an overcurrent state.
Further, the single chip microcomputer 10 may compare the total current value with a preset second current value range, and if the total current value exceeds the preset second current value range, output a high level at the first control voltage output terminal 109 and the third control voltage output terminal 107, and output a low level at the second control voltage output terminal 108.
At this time, the source and the drain of the first PMOS transistor 301 and the third PMOS transistor 303 are kept connected, the source and the drain of the second PMOS transistor 302 are disconnected, and the current input by the external power supply charges the battery pack through the first PMOS transistor 301 and the third PMOS transistor 303.
It should be noted that, since the charging current of the battery is reduced due to its own characteristic during the charging process, the predetermined second current value range is determined by the battery charging current characteristic curve, and a specific current value can be selected from the characteristic curve as the threshold for switching from the large current charging to the trickle charging.
With reference to fig. 1, the control circuit further includes a thermistor 501, the thermistor 501 is attached to the outer surface of the battery pack, one end of the thermistor 501 is connected to the constant voltage source, and the other end of the thermistor 501 is connected to the fourth analog-to-digital conversion terminal 106 of the single chip microcomputer 10.
The single chip microcomputer 10 obtains a voltage value of the thermistor 501 from the fourth mode converting terminal 106, obtains a temperature value of the outer surface of the battery pack according to the voltage value of the thermistor 501, compares the temperature value with a preset temperature value range, and if the temperature value exceeds the preset temperature value range, the surface battery pack temperature is too high, and at this time, a low level can be output at the first control voltage output terminal 107, the second control voltage output terminal 108, and the third control voltage output terminal 109, so that the source and the drain of the first PMOS transistor 301, the second PMOS transistor 302, and the third PMOS transistor 303 are all disconnected, and charging and discharging of the battery pack is stopped.
In an alternative embodiment of the present invention, the number of the battery packs is multiple groups, and the multiple groups of battery packs are connected in series, in parallel, or in a combination of the above two.
Referring further to fig. 2, fig. 2 shows a specific circuit connection relationship of the control circuit of the battery pack.
As shown in fig. 2, the single chip 90 is connected to the battery pack through a current detection circuit 902 and a voltage detection circuit 901, and in this embodiment, the battery pack has 4 batteries respectively disposed between two adjacent batteries of P +2, P +1, 3P-, P-1-, and P-1.
The circuit 903 is a clock circuit for providing a time reference for the single chip 90.
The circuit 904 is a communication circuit, and the single chip 90 communicates with an external device through the circuit 904.
The invention further provides a mobile power supply which comprises the control circuit.
In summary, the first PMOS transistor, the second PMOS transistor, and the third PMOS transistor are reasonably arranged in the charging path, and each PMOS transistor is controlled according to the voltage, current, and temperature state of the battery pack, so that whether the battery pack is charged can be controlled according to the voltage, current, and temperature state of the battery pack, and therefore, the battery pack inside the mobile power supply can be protected and is in the optimal charging state.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A control circuit for a battery pack, the control circuit being configured to control the battery pack, the battery pack including a plurality of cells connected in series; the control circuit includes:
the current input end is connected with an external power supply in a pluggable manner;
the single chip microcomputer comprises a plurality of first analog-to-digital conversion ends which are respectively connected to the anode and the cathode of the battery pack and between every two adjacent batteries;
the drain electrode of the first PMOS tube is connected with the current input end, and the grid electrode of the first PMOS tube is connected with the first control voltage output end of the singlechip;
the drain electrode of the second PMOS tube is connected with the current input end, and the grid electrode of the second PMOS tube is connected with the second control voltage output end of the singlechip;
a drain electrode of the third PMOS tube is connected with the anode of the battery pack, a grid electrode of the third PMOS tube is connected with a third control voltage output end of the singlechip, and a source electrode of the third PMOS tube is connected with a source electrode of the second PMOS tube;
the current-limiting resistor is arranged between the source electrode of the third PMOS tube and the source electrode of the first PMOS tube;
when the current input end is connected with the external power supply, the single chip microcomputer outputs a low level at the third control voltage output end, outputs a high level at the first control voltage output end and the second control voltage output end, and the external power supply charges the battery pack through the first PMOS tube and the second PMOS tube; the single chip microcomputer respectively obtains the voltage values of the anode and the cathode of the battery pack and between every two adjacent batteries from the plurality of first analog-to-digital conversion ends, thereby obtaining the voltage value between the anode and the cathode of each battery, comparing each voltage value with a preset voltage value range by the singlechip, if the voltage value exceeds the preset voltage value range, a low level is output at the first control voltage output terminal and the second control voltage output terminal, outputting a high level at the third control voltage output end, controlling the source electrode and the drain electrode of the first PMOS tube to be disconnected, controlling the source electrode and the drain electrode of the second PMOS tube to be disconnected, and controlling the source electrode and the drain electrode of the third PMOS tube to be kept connected, the first PMOS tube and the second PMOS tube discharge the battery pack so that the battery pack is not in an overvoltage state.
2. The control circuit according to claim 1, further comprising a current detection resistor, wherein one end of the current detection resistor is connected to the second analog-to-digital conversion terminal of the single chip microcomputer and the positive electrode of the battery pack, and the other end of the current detection resistor is connected to the third analog-to-digital conversion terminal of the single chip microcomputer and the ground terminal.
3. The control circuit of claim 2, wherein the single chip microcomputer obtains a first voltage from the second analog-to-digital conversion terminal, obtains a second voltage from the third analog-to-digital conversion terminal, and obtains the total current value of the battery pack according to the following equation:
I＝(V1-V2)/R；
wherein I is the total current value, V1 is the first voltage, V2 is the second voltage, and R is the resistance value of the current detection resistor.
4. The control circuit of claim 3, wherein the single-chip microcomputer compares the total current value with a preset current value range, and outputs a low level at the first control voltage output terminal and the second control voltage output terminal and a high level at the third control voltage output terminal if the total current value exceeds the preset current value range.
5. The control circuit of claim 2, further comprising a thermistor, wherein the thermistor is attached to the outer surface of the battery pack, one end of the thermistor is connected to the constant voltage source, and the other end of the thermistor is connected to a fourth analog-to-digital conversion end of the single chip microcomputer.
6. The control circuit according to claim 5, wherein the single chip microcomputer obtains a voltage value of the thermistor from the third analog-to-digital conversion terminal, obtains a temperature value of an outer surface of the battery pack according to the voltage value of the thermistor, compares the temperature value with a preset temperature value range, and outputs a low level at the first control voltage output terminal, the second control voltage output terminal, and the third control voltage output terminal if the temperature value exceeds the preset temperature value range.
7. The control circuit of claim 1, wherein the number of the battery packs is a plurality of groups, and the plurality of groups of the battery packs are connected in series, in parallel or in a combination of the two.
8. A mobile power supply comprising the control circuit of any one of claims 1 to 7.
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 |
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| CN105914821A CN105914821A (en) | 2016-08-31 |
| CN105914821B true CN105914821B (en) | 2020-03-31 |
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| CN104779669A (en) * | 2015-04-13 | 2015-07-15 | 深圳市格瑞普电池有限公司 | Lithium ion battery pack provided with charging protection circuit |
| 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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2016
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN101141072A (en) * | 2006-09-04 | 2008-03-12 | 仁宝电脑工业股份有限公司 | Mixed form charging battery module, and producing and charging-discharging method thereof |
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| CN105914821A (en) | 2016-08-31 |
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