CN201937251U - Threshold-adjustable integrated circuit for multi-lithium battery protection circuit - Google Patents
Threshold-adjustable integrated circuit for multi-lithium battery protection circuit Download PDFInfo
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- CN201937251U CN201937251U CN2011200017485U CN201120001748U CN201937251U CN 201937251 U CN201937251 U CN 201937251U CN 2011200017485 U CN2011200017485 U CN 2011200017485U CN 201120001748 U CN201120001748 U CN 201120001748U CN 201937251 U CN201937251 U CN 201937251U
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Abstract
The utility model mainly discloses a threshold-adjustable integrated circuit for a multi-lithium battery protection circuit. The integrated circuit comprises a chip power supply terminal VCC, a discharging loop current detecting terminal VM, a chip earth potential terminal GND, an external MOSFET (metal-oxide -semiconductor field effect transistor) charging control terminal CO and an external MOSFET discharging control terminal; an external resistor terminal VR is arranged on a chip; an external adjustable resistor R is connected with the power supply earthing end of the chip; and the resistance of the external adjustable resistor is regulated so as to regulate the protection threshold. The integrated circuit solves the problem that the protection threshold in the existing multi-lithium battery protection IC (integrated circuit) is limited, and realizes that the overvoltage and overcurrent protection thresholds are adjustable.
Description
Technical field
The utility model belongs to lithium ion battery protection integrated circuit, particularly a kind of integrated circuit of multisection lithium battery protective circuit adjustable threshold value.
Background technology
In recent years, because plurality of advantages such as lithium battery have that volume is little, energy density is high, memory-less effect, cycle life height, high-voltage battery and self-discharge rate are low, increasing electronic product such as digital camera, PDA, mobile phone adopts lithium battery as main power supply.
Yet; because the chemical characteristic of lithium ion battery; in normal use; the chemical positive reaction that electric energy and chemical energy transform is mutually carried out in its inside; but under certain conditions; as it is overcharged; overdischarge and overcurrent will cause inside battery generation chemical side reactions; after this side reaction aggravation; can have a strong impact on the performance and the useful life of battery; and may produce a large amount of gases; make cell internal pressure increase after-explosion rapidly and cause safety problem; therefore all lithium ion batteries all need a protective circuit; be used for filling to battery; discharge condition is effectively monitored, and turn-offs under certain conditions and fill; discharge loop damages battery preventing.
Lithium ionic battery protection circuit in the market; all will overcharge, the protection threshold value of overdischarge and overcurrent etc. is made as fixing; gather battery information and protect threshold value to compare by sample circuit then with each; by the result after the comparison; the decision charging and discharging circuit shutoff and open, realized protection to battery.
As shown in Figure 1, be existing lithium ionic battery protection circuit schematic diagram, its course of work explanation:
One, overvoltage protection: behind sample circuit sampling cell voltage; in comparison circuit, compare with reference voltage value; comparative result is sent into logic control circuit, by the opening or turn-offing of the MOS on the logic control circuit decision charging and discharging circuit, thereby realizes battery is carried out overvoltage protection.
Two, overcurrent protection: gather charging and discharging currents by the VM terminal and flow through the pressure drop that MOS produces; in comparison circuit, compare with reference voltage value; comparative result is sent into logic control circuit; by the opening or turn-offing of the MOS on the logic control circuit decision charging and discharging circuit, thereby realize battery is carried out overvoltage protection.
The shortcoming of such scheme: it is fixing to protect threshold value to be made as in advance, causes protecting threshold value non-adjustable, and flexibility is not high during use.
The utility model content
The purpose of this utility model just provides a kind of integrated circuit of multisection lithium battery protective circuit adjustable threshold value, solves the limited problem of protection threshold value among the existing multisection lithium battery protection IC, has realized the protection adjustable threshold value.
For achieving the above object, the technical solution adopted in the utility model is:
The integrated circuit of multisection lithium battery protective circuit adjustable threshold value; this integrated circuit comprises: chip power supply power supply terminal VCC; discharge loop current detecting terminal VM; chip earth potential terminal GND; external MOSFET charging control terminal CO, external MOSFET discharge control terminal DO, chip is provided with outer meeting resistance terminal VR; connect external adjustable resistance R to the chip power supply earth terminal, regulate the resistance of external adjustable resistance and regulate the protection threshold value.
Described IC interior comprises with lower unit:
Voltage sampling circuit, sampling A supply power voltage and charging and discharging circuit voltage, and send in the comparison circuit;
Reference current generating circuit produces a reference current, as the constant-current source of voltage adjustable control circuit;
External adjustable resistance connects chip power supply earth terminal and voltage adjustable control circuit, forms adjustable pressure drop;
The voltage adjustable control circuit is gathered the adjustable pressure drop on the external adjustable resistance, forms the adjustable protection threshold value of overvoltage and overcurrent, sends in the comparison circuit;
Comparison circuit, the magnitude of voltage that receives voltage sampling circuit and voltage adjustable control circuit compares, and draws comparative result;
Logic control circuit, the judged result of exporting according to comparison circuit produces logic control signal to discharging and recharging control end.
The beneficial effects of the utility model are: realized the adjustment of overvoltage and overcurrent protection threshold value by an external resistance.The built-in chip type reference current source is produced reference current value I, make reference current I flow through the external adjustable resistance R of chip, external ohmically pressure drop U
RSend into comparison circuit, send into the voltage V of comparison circuit by the resistance adjustment that changes external resistance R
COMThereby, realized the whole purpose of protection adjustable threshold value.The utility model circuit design is simple, and is applied widely, can adjust protection according to the chip of different model parameter.
Description of drawings
Fig. 1 is a protective circuit structured flowchart in the existing lithium ion battery charging and discharging circuit;
Fig. 2 is the circuit structure block diagram of the utility model preferred embodiment.
Embodiment
As shown in Figure 2, preferred embodiment is described in further details to the utility model.
The integrated circuit of multisection lithium battery protective circuit adjustable threshold value, this integrated circuit mainly have as lower connecting terminal:
Table 1
| Binding post | Describe |
| CO | External MOSFET charging control terminal |
| DO | External MOSFET discharge control terminal |
| VM | Charging and discharging circuit current detecting terminal |
| VCC | The chip power supply power supply terminal |
| GND | Chip earth potential terminal |
| VR | The outer meeting resistance terminal |
The utility model inside mainly comprises voltage sampling circuit 1 and 2, external adjustable resistance R, reference current generating circuit 3, voltage adjustable control circuit 4, comparison circuit 5, logic control circuit 6.
Voltage sampling circuit 1 main feeder ear VCC and the comparison circuit 5 that connects integrated circuit are magnitudes of voltage of gathering the feeder ear VCC of integrated circuit, and this voltage sent in the comparison circuit 5.
Voltage sampling circuit 2 is identical with voltage sampling circuit 1 structural principle, connects in charging and discharging circuit current detecting end VM and the comparison circuit 5, gathers the electric current on the charging and discharging circuit loop, draws the pressure drop on the external MOSFET, and this voltage is sent in the comparison circuit 5.
Reference current generating circuit 3 produces and the irrelevant reference current value I of external environment variation, and this reference current I is sent in the voltage adjustable control circuit 4.
External adjustable resistance R is connected on chip power supply earth terminal and the voltage adjustable control circuit 4, and reference current I forms an adjustable pressure drop U on external adjustable resistance R
R
Voltage adjustable control circuit 4 is gathered the adjustable pressure drop U on the external adjustable resistance
R, and form the adjustable protection threshold value of overvoltage and overcurrent respectively, send in the comparison circuit 5.
The adjustable protection threshold value of overvoltage, overcurrent that voltage that comparison circuit 5 will receive from voltage sampling circuit 1,2 and adjustable control circuit 4 form compares, and draws comparative result.
Logic control circuit 6 connects comparison circuits 5, and according to the judged result of comparison circuit 5 outputs, corresponding generation logic control signal is controlled the external MOSFET discharge of external MOSFET charging control terminal CO control terminal DO and opened or turn-off and discharge and recharge.
Claims (2)
1. the integrated circuit of multisection lithium battery protective circuit adjustable threshold value; this integrated circuit comprises: chip power supply power supply terminal VCC; discharge loop current detecting terminal VM; chip earth potential terminal GND; external MOSFET charging control terminal CO, external MOSFET discharge control terminal DO, it is characterized in that: chip is provided with outer meeting resistance terminal VR; connect external adjustable resistance R to the chip power supply earth terminal, regulate the resistance of external adjustable resistance and regulate the protection threshold value.
2. the integrated circuit of multisection lithium battery protective circuit adjustable threshold value as claimed in claim 1 is characterized in that: described IC interior comprises with lower unit:
Voltage sampling circuit, sampling A supply power voltage and charging and discharging circuit voltage, and send in the comparison circuit;
Reference current generating circuit produces a reference current, as the constant-current source of voltage adjustable control circuit;
External adjustable resistance connects chip power supply earth terminal and voltage adjustable control circuit, forms adjustable pressure drop;
The voltage adjustable control circuit is gathered the adjustable pressure drop on the external adjustable resistance, forms the adjustable protection threshold value of overvoltage and overcurrent, sends in the comparison circuit;
Comparison circuit, the magnitude of voltage that receives voltage sampling circuit and voltage adjustable control circuit compares, and draws comparative result;
Logic control circuit, the judged result of exporting according to comparison circuit produces logic control signal to discharging and recharging control end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200017485U CN201937251U (en) | 2011-01-06 | 2011-01-06 | Threshold-adjustable integrated circuit for multi-lithium battery protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200017485U CN201937251U (en) | 2011-01-06 | 2011-01-06 | Threshold-adjustable integrated circuit for multi-lithium battery protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201937251U true CN201937251U (en) | 2011-08-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200017485U Expired - Lifetime CN201937251U (en) | 2011-01-06 | 2011-01-06 | Threshold-adjustable integrated circuit for multi-lithium battery protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201937251U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064585A (en) * | 2011-01-06 | 2011-05-18 | 田剑彪 | Integrated circuit (IC) with adjustable protection threshold for protecting a plurality of lithium batteries |
| CN109378801A (en) * | 2018-11-29 | 2019-02-22 | 何岳明 | A kind of battery protection system |
| CN112653318A (en) * | 2020-12-05 | 2021-04-13 | 西安翔腾微电子科技有限公司 | External common resistance power MOSFET control method and controller |
| CN114336851A (en) * | 2021-12-29 | 2022-04-12 | 西安华泰半导体科技有限公司 | High-voltage-resistant protection method and system for single-section battery cell protection input |
-
2011
- 2011-01-06 CN CN2011200017485U patent/CN201937251U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064585A (en) * | 2011-01-06 | 2011-05-18 | 田剑彪 | Integrated circuit (IC) with adjustable protection threshold for protecting a plurality of lithium batteries |
| CN109378801A (en) * | 2018-11-29 | 2019-02-22 | 何岳明 | A kind of battery protection system |
| CN109378801B (en) * | 2018-11-29 | 2024-08-13 | 何岳明 | Battery protection system |
| CN112653318A (en) * | 2020-12-05 | 2021-04-13 | 西安翔腾微电子科技有限公司 | External common resistance power MOSFET control method and controller |
| CN114336851A (en) * | 2021-12-29 | 2022-04-12 | 西安华泰半导体科技有限公司 | High-voltage-resistant protection method and system for single-section battery cell protection input |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110817 Effective date of abandoning: 20130306 |
|
| RGAV | Abandon patent right to avoid regrant |