CN2857299Y - Charging protective circuit of lithium cell - Google Patents
Charging protective circuit of lithium cell Download PDFInfo
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- CN2857299Y CN2857299Y CN 200520068078 CN200520068078U CN2857299Y CN 2857299 Y CN2857299 Y CN 2857299Y CN 200520068078 CN200520068078 CN 200520068078 CN 200520068078 U CN200520068078 U CN 200520068078U CN 2857299 Y CN2857299 Y CN 2857299Y
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- voltage sampling
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Abstract
A Li-ion battery charging protection circuit, comprising charging protection circuits for all cells in the battery; said charging protection circuit for each cell comprises a protective chip IC and a peripheral circuit; wherein, the lithium battery protection circuit further comprises a voltage sample circuit and an execution control circuit; said voltage sample circuit employs an upper sampling resistor R4 and a lower sampling resistor R3 that are serially connected and connected to the positive and negative poles of the power supply unit as a voltage sampling circuit; the execution control circuit comprises capacitor C3 and C4, resistor R5, and a thyristor; the gate pole of said thyristor is connected to a sampling output point between the two resistors in the voltage sampling circuit, the positive pole of the thyristor is connected to the negative pole of the power supply unit, and the negative pole of the thyristor is serially connected to the resistor R5 and then connected to the over-charge voltage detection end. In that way, the power-loss reducing circuit composed of a field effect transistor and a transistor in the prior art can be omitted, while the performance and purpose of the circuit board are identical to the power loss reducing circuit.
Description
Technical field
The utility model relates to the voltage detecting protective circuit, is specifically related to the lithium cell charging protective circuit that a kind of overcharged voltage detects.
Background technology
Along with the development of lithium battery technology, cost performance improves constantly, and more and more is subjected to liking of user.Lithium battery is long because of energy density height, life-span, is widely used in various mobile electronic devices, as mobile phone, digital camera etc.But owing to make the particularity of lithium battery chemical material; make when battery being charged with charger; because the unsteadiness of power supply; perhaps to the undue charging of battery; can cause the dilatancy of battery to damage; even blast, so present finished product battery all will be equipped with protection circuit plate (PCB) discharging and recharging of battery protected.As China Patent No.: the conducting by metal-oxide-semiconductor as described in 03146990.6 disclosed " a kind of lithium cell charging protective circuit " ends and realizes effective charge protection, but the complicated cost of circuit is too high.And existing employing silicon controlled overcharges the charge protector that detects voltage; send information for mobile phone or charger at cell voltage when overcharging when detecting a little less than protection IC; thereby turn-off charging; protected rechargeable battery effectively; but the sample resistance resistance that adopts in circuit is less; need to increase by what transistor and field effect transistor were formed and fall the loss that the consumable circuit reduces circuit, thereby strengthened the complexity and the cost of circuit.
The utility model content
Technical problem to be solved in the utility model provides that a kind of circuit is simple, cost is low, can realize the lithium cell charging protective circuit to the over-charge of lithium battery protection equally.
The utility model can be achieved through the following technical solutions:
A kind of lithium cell charging protective circuit, the charge protector that comprises each electric core in the battery, the charge protector of electricity core comprises protection chip IC and peripheral circuit thereof, and the peripheral circuit of IC has comprised metal-oxide-semiconductor Q1, the Q2 of on-off action, links with IC DOUT end, COUT end respectively; Resistance R 1, R2 and capacitor C 1, capacitor C 1 is parallel to chip IC VSS end, between the vdd terminal, filter capacitor C2 also is connected on the battery charge loop, also comprise a voltage sampling circuit and an execution control circuit on above-mentioned a kind of lithium cell charging loop, this voltage sampling circuit adopts the last sample resistance R4 and the following sample resistance R3 of two series connection, it just is being connected in power supply respectively, negative pole is as voltage sampling circuit, this carries out control circuit by capacitor C 3, C4, a resistance R 5 and a controllable silicon are formed, this silicon controlled trigger electrode is connected in the sampling output point between two resistance of voltage sampling circuit, the negative pole of silicon controlled anode and power supply connects, and is connected in the overcharged voltage test side after silicon controlled negative electrode and resistance R 5 series connection.Last sample resistance in the above-mentioned voltage sampling circuit, resistance are 10-40M; Following sample resistance, resistance is: 500K-2M.
The utility model compared with prior art has the following advantages:
The utility model adopts bigger sample resistance, falls circuit from power consumption thereby save by what field effect transistor, transistor were formed.Circuit power consumption has only increased about 1uA than the existing circuit that falls from power consumption that adopts, and actual measurement way circuit power consumption is about 4uA, in the scope of standard value 6uA.Simplify circuit, reduced cost.But it is the same that the circuit board of consumable circuit falls in the various performances of circuit board, effect and employing.
Description of drawings
Fig. 1 is the circuit theory diagrams of existing lithium cell charging protective circuit of the present utility model;
Fig. 2 is the circuit theory diagrams of the utility model lithium cell charging protective circuit.
Embodiment
The utility model is described in further detail by embodiment below in conjunction with accompanying drawing.
A kind of as shown in Figure 2 lithium cell charging protective circuit: comprise the charge protector of electric core in the battery, the charge protector of electric core comprises protection chip IC and peripheral circuit thereof, voltage sampling circuit and execution control circuit.The peripheral circuit of IC has comprised metal-oxide-semiconductor Q1, the Q2 of on-off action, and Q1, Q2 link with the DOUT of IC end, COUT end respectively; Resistance R 1, R2 and capacitor C 1, capacitor C 1 are parallel between chip IC VSS end, the vdd terminal, and filter capacitor C2 also is connected on the circuit; The integrated crystal oscillator of protection chip IC, voltage stabilizing, current-limiting circuit, pressure limiting circuit, thermal protection circuit is in one.Voltage sampling circuit comprises sample resistance R4 and following sample resistance R3, and its positive and negative electrode that is connected in power supply respectively is as voltage sampling circuit; Carry out control circuit by capacitor C 3, C4, a resistance R 5 and a controllable silicon U2 form, the trigger electrode of this controllable silicon U2 is connected in the sampling output point between two resistance of voltage sampling circuit, the anode of controllable silicon U2 and the negative pole of power supply connect, be connected in after the negative electrode of controllable silicon U2 and resistance R 5 series connection and overcharge the detection voltage end, capacitor C 3 is connected between the trigger electrode and anode of silicon controlled, and the R5 and the controllable silicon U2 of capacitor C 4 and series connection are connected in parallel between overcharged voltage test side and the power cathode, strobe.Electric current is through resistance R 1, and vdd terminal, the V-of protection chip IC hold and resistance R 2,, make it to form charge circuit.The protection chip IC records foreign current and voltage by vdd terminal, VSS end, and institute's electric current of surveying is then conducting metal-oxide-semiconductor Q1, Q2 during less than the rated current threshold values protected in the chip IC, is charged to battery battery core by power supply; When being higher than the rated voltage threshold values of protecting in the chip IC, survey voltage then exports high level signal to metal-oxide-semiconductor Q1, Q2; metal-oxide-semiconductor Q1, Q2 are disconnected; thereby battery battery core and voltage sample circuit form discharge loop; when the voltage of the sampling output point between two resistance of voltage sample circuit overcharges detection voltage a little less than protection IC; sampling output point voltage is higher than silicon controlled trigger electrode voltage; the controllable silicon conducting that is triggered; overcharge the detection voltage end and send information promptly for mobile phone or charger, thereby turn-off charging.
Claims (2)
1. lithium cell charging protective circuit, the charge protector that comprises each electric core in the battery, the charge protector of electricity core comprises protection chip IC and peripheral circuit thereof, and the peripheral circuit of IC has comprised metal-oxide-semiconductor Q1, the Q2 of on-off action, links with IC DOUT end, COUT end respectively; Resistance R 1, R2 and capacitor C 1, capacitor C 1 are parallel between chip IC VSS end, the vdd terminal, and filter capacitor C2 also is connected on the battery charge loop, it is characterized in that: also comprise a voltage sampling circuit and an execution control circuit;
Voltage sampling circuit adopts the last sample resistance R4 and the following sample resistance R3 of two series connection, and its positive and negative electrode that is connected in power supply respectively is as voltage sampling circuit;
Carry out control circuit by capacitor C 3, C4, a resistance R 5 and a controllable silicon are formed, this silicon controlled trigger electrode is connected in the sampling output point between two resistance of voltage sampling circuit, the negative pole of silicon controlled anode and power supply connects, and is connected in the overcharged voltage test side after silicon controlled negative electrode and resistance R 5 series connection.
2. a kind of lithium cell charging protective circuit as claimed in claim 1 is characterized in that: the last sample resistance in the above-mentioned voltage sampling circuit, resistance are 10-40M; Following sample resistance, resistance is: 500K-2M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520068078 CN2857299Y (en) | 2005-11-17 | 2005-11-17 | Charging protective circuit of lithium cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520068078 CN2857299Y (en) | 2005-11-17 | 2005-11-17 | Charging protective circuit of lithium cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2857299Y true CN2857299Y (en) | 2007-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520068078 Expired - Fee Related CN2857299Y (en) | 2005-11-17 | 2005-11-17 | Charging protective circuit of lithium cell |
Country Status (1)
| Country | Link |
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| CN (1) | CN2857299Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570403A (en) * | 2010-12-28 | 2012-07-11 | 宁波良业电器有限公司 | Temperature protection circuit for lithium ion battery charging and discharging |
| CN101651333B (en) * | 2008-08-11 | 2012-07-25 | 新德科技股份有限公司 | Delay time control circuit for reducing delay time in battery protector |
| CN107180932A (en) * | 2017-03-30 | 2017-09-19 | 北京奇艺世纪科技有限公司 | A kind of cell apparatus, the guard method of cell apparatus and wear-type visual device |
-
2005
- 2005-11-17 CN CN 200520068078 patent/CN2857299Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101651333B (en) * | 2008-08-11 | 2012-07-25 | 新德科技股份有限公司 | Delay time control circuit for reducing delay time in battery protector |
| CN102570403A (en) * | 2010-12-28 | 2012-07-11 | 宁波良业电器有限公司 | Temperature protection circuit for lithium ion battery charging and discharging |
| CN102570403B (en) * | 2010-12-28 | 2015-04-22 | 宁波良业电器有限公司 | Temperature protection circuit for lithium ion battery charging and discharging |
| CN107180932A (en) * | 2017-03-30 | 2017-09-19 | 北京奇艺世纪科技有限公司 | A kind of cell apparatus, the guard method of cell apparatus and wear-type visual device |
| CN107180932B (en) * | 2017-03-30 | 2020-03-20 | 北京奇艺世纪科技有限公司 | Battery device, protection method of battery device and head-mounted visual equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070110 Termination date: 20101117 |