CN201464623U - Circuit by using protecting chip and diodes to realize overcurrent detection - Google Patents
Circuit by using protecting chip and diodes to realize overcurrent detection Download PDFInfo
- Publication number
- CN201464623U CN201464623U CN2009200979257U CN200920097925U CN201464623U CN 201464623 U CN201464623 U CN 201464623U CN 2009200979257 U CN2009200979257 U CN 2009200979257U CN 200920097925 U CN200920097925 U CN 200920097925U CN 201464623 U CN201464623 U CN 201464623U
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- Prior art keywords
- diode
- power supply
- rechargeable battery
- protection chip
- battery pack
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- Expired - Fee Related
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The utility model discloses a circuit by using a protecting chip and diodes to realize overcurrent detection, comprising a power supply and a single unit of protecting chip U1, wherein the positive end V+ of the power supply is connected with positive poles of partial batteries connected inside a rechargeable battery pack in series, and the negative end V- of the power supply is connected with the negative end B- of the rechargeable battery pack; a current detection pin end VM of the single unit of protecting chip U1 is sequentially connected with a resistance R2, a positive pole of the diode D1; a negative pole of the diode D1 is connected with a positive pole of the diode D2; and a negative pole of the diode D2 is connected with a positive pole of the diode D3, and a negative pole of the diode D3 is connected with the negative end V- of the power supply. The circuit has the function of detecting overcurrent of the rechargeable battery pack, is simple and reliable in current as well as low in cost and energy consumption, has superior adaptability, and is applicable to overcurrent detection of the rechargeable battery packs with different connecting ways, thus having wide market application prospect and important production practice significance.
Description
Technical field
The utility model relates to the battery technology field, particularly relates to a kind of protection chip and diode of utilizing and realizes the circuit that excess current detects.
Background technology
At present, in the rechargeable battery pack of circuit and charge management circuit that needs protection, the utilization holding circuit can realize overcharging, overdischarge and excess current protective function, guarantees the security of electric battery.
The type of existing battery pack protection chip includes single-unit, 2 joints, 3～4 joints, 5～13 joints etc.; that is to say; a slice protection chip can carry out the security protection to 13 joint series connected battery at most, and wherein, overcurrent detection just can be realized by protection chip itself.
But; after the quantity of battery series connection increases; the protection chip is subjected to the rated voltage restriction of its current sense pin; it can't be effectively detects the discharge current of series-connected cell; independent outer detecting circuit just need be set to be come the discharge current of rechargeable battery pack is detected; when unusual (as excessive), realize excess current protective function immediately at discharge current, guarantee the security of electric battery by this testing circuit.
The utility model content
In view of this; the purpose of this utility model provides a kind of protection chip and diode of utilizing and realizes the circuit that excess current detects; can realize overcurrent detection to rechargeable battery pack; and electric current is simple and reliable, cost and low in energy consumption, have superior adaptability; be applicable to the detection of the rechargeable battery pack excess current of different connected modes; thereby have market application foreground widely, be of great practical significance.
For this reason, the utility model provides a kind of protection chip and diode of utilizing to realize the circuit that excess current detects, include power supply and single-unit protection chip U1, the anode V+ of this power supply is connected with the positive pole of part series-connected cell in the rechargeable battery pack, the negative terminal V-of this power supply is connected with the negative terminal B-of rechargeable battery pack, the current sense pin end VM of this single-unit protection chip U1 is connecting resistance R2 successively, the anode of diode D1, the negative electrode of this diode D1 and the anode of diode D2 join, the anode of the negative electrode of described diode D2 and diode D3 joins, and the negative terminal V-of the negative electrode of described diode D3 and described power supply joins;
The power pin Vdd of this single-unit protection chip U1 is the anode V+ of connecting resistance R1 and described power supply successively; The ground pin Vss of this single-unit protection chip U1 and the negative terminal V-of described power supply join; Be connected to capacitor C 1 between the power pin Vdd of described single-unit protection chip U1 and the ground pin Vss; The anode of described diode D1 also joins with main circuit current test side VMI by resistance R 3.
The technical scheme that is provided by above the utility model as seen; compared with prior art; the utility model provides a kind of protection chip and diode of utilizing to realize the circuit that excess current detects; can realize overcurrent detection to rechargeable battery pack; and electric current is simple and reliable, cost and low in energy consumption, have superior adaptability; the excess current that is applicable to the rechargeable battery pack of different connected modes detects, thereby has market application foreground widely, is of great practical significance.
Description of drawings
A kind of circuit diagram that utilizes protection chip and diode to realize the circuit that excess current detects that Fig. 1 provides for the utility model.
Embodiment
In order to make those skilled in the art person understand the utility model scheme better, the utility model is described in further detail below in conjunction with drawings and embodiments.
A kind of circuit diagram that utilizes protection chip and diode to realize the circuit that excess current detects that Fig. 1 provides for the utility model.
Referring to Fig. 1; the utility model provides a kind of protection chip and diode of utilizing to realize the circuit that excess current detects; this circuit is used for that rechargeable battery pack is carried out excess current and detects; include power supply and single-unit protection chip U1; the anode V+ of this power supply is connected with the positive pole of part series-connected cell in the rechargeable battery pack; the negative terminal V-of this power supply is connected with the negative terminal B-of rechargeable battery pack; thereby part extracts two ends (being B+ and the B-) voltage of rechargeable battery pack; these rechargeable battery pack two ends are that the electronic component in the major loop is powered; the anode P+ of described major loop and the anode B+ of rechargeable battery pack directly join; the negative terminal P-of described major loop is not the negative terminal V-with the negative terminal B-of rechargeable battery pack and power supply directly join (shown in Fig. 1 dotted line); can be provided with other circuit between the negative terminal V-of the negative terminal P-of described major loop and the negative terminal B-of rechargeable battery pack and power supply, as on-off circuit etc.
The current sense pin end VM of this single-unit protection chip U1 is the anode of connecting resistance R2, diode D1 successively, the negative electrode of this diode D1 and the anode of diode D2 join, the anode of the negative electrode of described diode D2 and diode D3 joins, and the negative terminal V-of the negative electrode of described diode D3 and described power supply joins;
The power pin Vdd of this single-unit protection chip U1 is the anode V+ of connecting resistance R1 and described power supply successively; The ground pin Vss of this single-unit protection chip U1 and the negative terminal V-of described power supply join; Be connected to capacitor C 1 between the power pin Vdd of described single-unit protection chip U1 and the ground pin Vss;
Need to prove that by the voltage regulation filtering effect of above-mentioned resistance R 1 and C1, the power supply of circuit provides stable power for testing circuit.
In the utility model, the anode of described diode D1 also joins with main circuit current test side VMI by resistance R 3, this main circuit current test side VMI and major loop join, be used for detecting in real time the electric current of major loop, by the dividing potential drop effect of resistance R 3, protect the voltage of the current sense pin end VM of chip U1 to limit to single-unit;
Need to prove; the voltage that above-mentioned three diode in series D1, D2, D3 restriction single-unit protection chip U1 current sense pin end VM has greater than the detection threshold voltage of VM less than the maximum rated voltage of VM, thereby avoided single-unit protection chip U1 to be subjected to physical damnification.
When the electric current of discharge in the major loop reaches the detection voltage threshold that the current sense pin end VM of single-unit protection chip U1 sets; the discharge control end DO of single-unit protection chip U1 exports respective element action in the major loop that corresponding signal goes to control the rechargeable battery pack power supply, cuts off main circuit current.
At this moment; referring to shown in Figure 1; the magnitude of voltage of main circuit current test side VMI is lower than the voltage (promptly equaling the voltage of B+) of rechargeable battery pack anode P+; make diode D1 by current-limiting resistance R3; D2 and D3 conducting; thereby the voltage of the current sense pin end VM of restriction single-unit protection chip U1 (for example; when the magnitude of voltage of main circuit current test side VMI during than the low 2V of the voltage of rechargeable battery pack anode P+; the voltage of current sense pin end VM is 1V); this voltage is much larger than the detection voltage threshold of VM; thereby can lock the signal of the discharge control end DO of single-unit protection chip U1; to the failure of current of the major loop of rechargeable battery pack power supply, the final reliable excess current protective function of realizing rechargeable battery pack.
Also need to prove, when the utility model over-current detection circuit increases in series-connected cell quantity, the conducting electric current that specification by adjusting current-limiting resistance R3 and quantity in parallel limit diode D1, D2, D3, thereby the detection voltage of the current sense pin end VM of restriction single-unit protection chip U1 is realized overcurrent detection; Of the present utility model take up room little, circuit is simple and reliable, cost is low, has superior adaptability, can not be subjected to the restriction of connected mode, voltage according to electric battery is selected current-limiting resistance R3 specification and quantity, and specification and the quantity of selecting diode D1, D2 and D3, go for the detection of the rechargeable battery pack excess current of different connected modes.
In addition, the power consumption of the single-unit protection chip U1 that the utility model provides is extremely low, does not increase the original system power consumption during work substantially.
In sum; compared with prior art; the utility model provides a kind of protection chip and diode of utilizing to realize the circuit that excess current detects; can realize overcurrent detection to rechargeable battery pack; and electric current is simple and reliable, cost and low in energy consumption, have superior adaptability; be applicable to the detection of the rechargeable battery pack excess current of different connected modes, thereby have market application foreground widely, be of great practical significance.
The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (1)
1. one kind is utilized protection chip and diode to realize the circuit that excess current detects, it is characterized in that, include power supply and single-unit protection chip U1, the anode V+ of this power supply is connected with the positive pole of part series-connected cell in the rechargeable battery pack, the negative terminal V-of this power supply is connected with the negative terminal B-of rechargeable battery pack, the current sense pin end VM of this single-unit protection chip U1 is connecting resistance R2 successively, the anode of diode D1, the negative electrode of this diode D1 and the anode of diode D2 join, the anode of the negative electrode of described diode D2 and diode D3 joins, and the negative terminal V-of the negative electrode of described diode D3 and described power supply joins;
The power pin Vdd of this single-unit protection chip U1 is the anode V+ of connecting resistance R1 and described power supply successively; The ground pin Vss of this single-unit protection chip U1 and the negative terminal V-of described power supply join; Be connected to capacitor C 1 between the power pin Vdd of described single-unit protection chip U1 and the ground pin Vss; The anode of described diode D1 also joins with main circuit current test side VMI by resistance R 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200979257U CN201464623U (en) | 2009-07-24 | 2009-07-24 | Circuit by using protecting chip and diodes to realize overcurrent detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200979257U CN201464623U (en) | 2009-07-24 | 2009-07-24 | Circuit by using protecting chip and diodes to realize overcurrent detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201464623U true CN201464623U (en) | 2010-05-12 |
Family
ID=42391972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200979257U Expired - Fee Related CN201464623U (en) | 2009-07-24 | 2009-07-24 | Circuit by using protecting chip and diodes to realize overcurrent detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201464623U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459290A (en) * | 2014-12-25 | 2015-03-25 | 青岛歌尔声学科技有限公司 | Overcurrent detection circuit, device and method |
| CN105655659A (en) * | 2016-02-24 | 2016-06-08 | 江苏师范大学 | Battery power storage module with microcomputer chip and portable computer |
-
2009
- 2009-07-24 CN CN2009200979257U patent/CN201464623U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459290A (en) * | 2014-12-25 | 2015-03-25 | 青岛歌尔声学科技有限公司 | Overcurrent detection circuit, device and method |
| CN105655659A (en) * | 2016-02-24 | 2016-06-08 | 江苏师范大学 | Battery power storage module with microcomputer chip and portable computer |
| CN105655659B (en) * | 2016-02-24 | 2017-12-15 | 江苏师范大学 | Battery power storage module with microcomputer chip and portable computer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100512 Termination date: 20180724 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |