CN203607846U - Rechargeable battery protection circuit - Google Patents
Rechargeable battery protection circuit Download PDFInfo
- Publication number
- CN203607846U CN203607846U CN201320845422.XU CN201320845422U CN203607846U CN 203607846 U CN203607846 U CN 203607846U CN 201320845422 U CN201320845422 U CN 201320845422U CN 203607846 U CN203607846 U CN 203607846U
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- circuit
- rechargeable battery
- power supply
- supply chip
- secondary battery
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Abstract
The utility model provides a rechargeable battery protection circuit. The circuit comprises a rechargeable battery, a power supply chip, an inverse-prevention circuit and a charging circuit, wherein the inverse-prevention circuit and the charging circuit are connected between the rechargeable battery and the power supply chip. The inverse-prevention circuit is an inverse-prevention MOS pipe. A grid electrode of the inverse-prevention MOS pipe is grounded, a source electrode is connected to a power supply input terminal of the power supply chip and a drain electrode is connected to a power supply output terminal of the rechargeable battery. By using the circuit, system power consumption is reduced; a service life of the battery is protected and production cost of a product is greatly reduced. Compared to the other rechargeable battery protection circuit, by using the circuit of the utility model, there are the following advantages that a circuit design is simple; performance is stable; cost is low and so on. The circuit is suitable for various kinds of inverse-prevention charging cell over-discharge protection circuits.
Description
Technical field
The utility model relates to a kind of secondary battery protective circuit, relates to particularly a kind ofly preventing that rechargeable battery from connecing anti-protective circuit.
Background technology
Rapidly, rechargeable battery obtains using more and more widely in consumer electronics product development at present.The advantages such as rechargeable battery has economy, environmental protection, electric weight foot, it is high-power to be applicable to, long-time use, are well received by consumers.This type of consumer electronics product is due to structural carelessness, on the one hand, the negative pressure forming after battery connects is instead easy to breakdown potential source chip, cause expendable damage, existing solution is between rechargeable battery and power supply chip, to increase counnter attack diode, but because diode drop is excessive, greatly increase the power consumption of system; On the other hand, battery over-discharge can cause expendable infringement to battery itself, has had a strong impact on the useful life of battery.
Utility model content
Prevent from connecing the problem that circnit NOT power consumption is larger for solving existing rechargeable battery, the utility model proposes a kind of secondary battery protective circuit, and be achieved by the following technical solutions:
A kind of secondary battery protective circuit; comprise rechargeable battery, power supply chip and be connected to rechargeable battery and power supply chip between anti-circnit NOT and charging circuit; wherein; described anti-circnit NOT is a counnter attack metal-oxide-semiconductor; the grounded-grid of this counnter attack metal-oxide-semiconductor; source electrode connects the power input of power supply chip, and drain electrode connects the power output end of rechargeable battery.
Further, the utility model also comprises an electric voltage observation circuit and controller, the input of described electric voltage observation circuit connects the power output end of described rechargeable battery, output connects the voltage monitoring end of described controller, and described controller is the Enable Pin to described power supply chip according to the high and low level of the Voltage-output of described rechargeable battery.
Further, described electric voltage observation circuit comprises the potential-divider network being composed in series by the first divider resistance and the second divider resistance, and the voltage monitoring end of described controller is connected between the first divider resistance and the second divider resistance.
Further, connect a control switch on described potential-divider network, the control end of this control switch connects the Enable Pin of controller.
Further, between the power output end of described rechargeable battery and ground, be connected with storage capacitor.
Further, described control switch is a control metal-oxide-semiconductor, and the grid of this control metal-oxide-semiconductor connects the output that enables of controller, and source electrode and drain electrode are connected on described potential-divider network.
Further, described charging circuit is RC charging circuit.
Compared with prior art, advantage of the present utility model and good effect are as follows:
1, the battery low-voltage protection circuit that the utility model proposes a kind of anti-reflection function simply with low pressure drop not only can reduce the useful life of system power dissipation, protection battery, also greatly reduces the production cost of product.With respect to other secondary battery protective circuit, the utlity model has that circuit design is simple, stable performance, the advantage such as with low cost, applicable to various anti-transoid rechargeable battery over-discharge protection circuits.
2, the utility model is monitored charged battery voltage, once charged battery voltage is too low, ends it proceed electric discharge by controller, avoids the generation of overdischarge phenomenon, and battery is played to very large protective effect.
Read by reference to the accompanying drawings after embodiment of the present utility model, other features of the present utility model and advantage will become clearer.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the utility model embodiment secondary battery protective schematic block circuit diagram;
Fig. 2 is the utility model embodiment secondary battery protective circuit theory diagrams;
Fig. 3 is the utility model embodiment electric voltage observation circuit schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
With reference to figure 1, the present embodiment secondary battery protective circuit, comprises rechargeable battery, anti-circnit NOT, power supply chip, controller MCU and other peripheral circuits.
The anti-circnit NOT of the present embodiment adopts P channel MOS tube, makes full use of metal-oxide-semiconductor conducting internal resistance little, has the low advantage of pressure drop than the anti-circnit NOT of diode, and its anti-circnit NOT pressure drop is low, and power consumption is little, has greatly reduced the power consumption of system.Cross and put the damage causing for fear of rechargeable battery, the present embodiment also comprises controller MCU and an electric voltage observation circuit, the input of described observation circuit connects the power output end of described rechargeable battery, output connects the voltage monitoring end of described controller, in order to monitor the voltage of rechargeable battery and to export to the voltage monitoring end of described controller MCU, described controller MCU is high according to the Voltage-output of above-mentioned rechargeable battery, low level is to the Enable Pin of described power supply chip, control the Enable Pin of power supply chip by MCU, when charged battery voltage is too low, MCU drags down the Enable Pin of power supply chip, make system in closed condition.
Particularly, with reference to figure 2, between the both positive and negative polarity of rechargeable battery, be connected with counnter attack metal-oxide-semiconductor Q1, Q1 grid G ground connection, source S connects the power input VIN of power supply chip U1, and drain D connects the power output end of rechargeable battery and holds, capacitor C 1, resistance R 1 form RC charging circuit, capacitor C 2, C3, C4 are the filter capacitors of power supply chip U1, and the Enable Pin EN that the MCU_POWER_EN end of MCU is connected to power supply chip U1 by counnter attack diode D1 powers on to power supply chip U1, makes it work.
The present embodiment power supply chip illustrates with LDO (can be also DC-DC), and Q1 is P channel mosfet pipe, is voltage-controlled type device.When in rechargeable battery connecting system, because the inner integrated parasitic diode of Q1, in the time of not conducting of Q1, drain D flows to source S by parasitic diode, make source S terminal voltage be greater than grid G voltage, in the time that voltage is greater than the conducting voltage of metal-oxide-semiconductor, Q1 conducting, enter saturation region after Q1 internal resistance very little, make pressure drop be far smaller than the pressure drop of counnter attack diode of the prior art, greatly reduce power consumption.After rechargeable battery connects instead, now the grid G voltage of Q1 is higher than source S voltage, and Q1, in closed condition, has played the effect of counnter attack.
After battery access, the charging circuit of R1, C1 composition is charged, can regulating resistance R1, the parameter of capacitor C 1 is greater than charging interval parameter setting the reaction time parameter working on power of MCU.Because capacitor C 1 both end voltage can not be suddenlyd change, the voltage of resistance R 1 upper end is high level in the time that battery accesses, power supply chip U1 Enable Pin EN is high level, and power supply chip is normally worked, and output voltage is VOUT, MCU is in running order afterwards, MCU_POWER_EN pin is drawn high, like this, even if R1, C1 charging circuit complete charging, the level of power supply chip U1 Enable Pin EN is still high level, and system still can normally be worked.
In order to prevent putting, monitoring voltage is passed to MCU pin by electric voltage observation circuit, voltage that can Real-Time Monitoring rechargeable battery.Once the voltage drop of rechargeable battery, after certain numerical value, drags down the level of the pin of MCU_POWER_EN, the Enable Pin EN of power supply chip U1 is dragged down rear system closing, has played the effect of under-voltage protection.When having after rechargeable battery access, system will complete next circulation.
Shown in Fig. 3, be electric voltage observation circuit, the first resistance R 2, the second resistance R 3 form potential-divider network, and Q2 controls metal-oxide-semiconductor, and MCU voltage monitoring end MCU_ADC is connected between the first divider resistance R2 and the second divider resistance R3.The capacity of considering battery is limited, if MCU goes the voltage of monitoring battery can make observation circuit have electric current to pass through always always, causes to a great extent the loss of battery capacity, greatly reduces the useful life of battery.The present embodiment connects a control metal-oxide-semiconductor Q2 on potential-divider network, and what the grid G of Q2 connected MCU enables output MCU_EN, and source S and drain D are connected between the first resistance R 2 and the second resistance R 3 on described potential-divider network.Q2 can be set to the voltage (can control by clock circuit) that removes at regular intervals to monitor rechargeable battery, and in the situation that needs are monitored cell voltage, MCU_EN end is high level, and Q2 opens.In the time not needing the situation of monitoring voltage, MUC_EN end is output as low level, and Q2 is in closed condition, when Q2 closes impedance very big, can be considered as open circuit, play the effect of saving battery capacity.
It should be noted that, the model of the controller MCU of the present embodiment can be BCM20733A2KML1G, the model of power supply chip U1 can be uP0108BMA5-18, two chip internals have been integrated with the processing method of corresponding signal, by the connection between respective pins and separately the signal input and output of pin can realize above-mentioned detection, monitoring and adjust the functions such as level.
External interference factor is easy to cause voltage fluctuation larger; especially in the time of external device start; if now remove to monitor cell voltage, probably cause the phenomenon of the too low and generation system of monitoring voltage mistake protection; the present embodiment increases a storage capacitor C5 at battery BAT end; like this; in the time causing voltage instability because of external interference factor, electric capacity temporarily plays the effect of electric discharge or charging; guarantee the stable of charged battery voltage; thereby can not cause the phenomenon of mistake protection, greatly increase stability and the reliability of system.
The above, be only preferred embodiment of the present utility model, is not to restriction of the present utility model, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But, every technical solutions of the utility model content that do not depart from, any simple modification, equivalent variations and the remodeling above embodiment done according to technical spirit of the present utility model, still belong to the protection range of technical solutions of the utility model.
Claims (7)
1. a secondary battery protective circuit; comprise rechargeable battery, power supply chip and be connected to rechargeable battery and power supply chip between anti-circnit NOT and charging circuit; it is characterized in that; described anti-circnit NOT is a counnter attack metal-oxide-semiconductor; the grounded-grid of this counnter attack metal-oxide-semiconductor; source electrode connects the power input of power supply chip, and drain electrode connects the power output end of rechargeable battery.
2. secondary battery protective circuit according to claim 1; it is characterized in that: also comprise an electric voltage observation circuit and controller; the input of described electric voltage observation circuit connects the power output end of described rechargeable battery; output connects the voltage monitoring end of described controller, and described controller is the Enable Pin to described power supply chip according to the high and low level of the Voltage-output of described rechargeable battery.
3. secondary battery protective circuit according to claim 2; it is characterized in that: described electric voltage observation circuit comprises the potential-divider network being composed in series by the first divider resistance and the second divider resistance, the voltage monitoring end of described controller is connected between the first divider resistance and the second divider resistance.
4. secondary battery protective circuit according to claim 3, is characterized in that: on described potential-divider network, connect a control switch, the control end of this control switch connects the Enable Pin of controller.
5. secondary battery protective circuit according to claim 4, is characterized in that: between the power output end of described rechargeable battery and ground, be connected with storage capacitor.
6. according to the secondary battery protective circuit described in claim 4 or 5, it is characterized in that: described control switch is a control metal-oxide-semiconductor, the grid of this control metal-oxide-semiconductor connects the output that enables of controller, and source electrode and drain electrode are connected on described potential-divider network.
7. secondary battery protective circuit according to claim 1, is characterized in that: described charging circuit is RC charging circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320845422.XU CN203607846U (en) | 2013-12-20 | 2013-12-20 | Rechargeable battery protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320845422.XU CN203607846U (en) | 2013-12-20 | 2013-12-20 | Rechargeable battery protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203607846U true CN203607846U (en) | 2014-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320845422.XU Expired - Fee Related CN203607846U (en) | 2013-12-20 | 2013-12-20 | Rechargeable battery protection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683266A (en) * | 2013-12-20 | 2014-03-26 | 青岛歌尔声学科技有限公司 | Rechargeable battery protection circuit |
| CN106356977A (en) * | 2016-10-08 | 2017-01-25 | 深圳市斯派克光电科技有限公司 | Solar protection storage battery under-voltage circuit and protection method thereof |
| CN108173424A (en) * | 2017-12-25 | 2018-06-15 | 四川长虹电器股份有限公司 | A kind of portable device supply power soft switch system |
-
2013
- 2013-12-20 CN CN201320845422.XU patent/CN203607846U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683266A (en) * | 2013-12-20 | 2014-03-26 | 青岛歌尔声学科技有限公司 | Rechargeable battery protection circuit |
| CN106356977A (en) * | 2016-10-08 | 2017-01-25 | 深圳市斯派克光电科技有限公司 | Solar protection storage battery under-voltage circuit and protection method thereof |
| CN106356977B (en) * | 2016-10-08 | 2019-01-11 | 深圳市斯派克光电科技有限公司 | A kind of guard method of solar energy protection storage battery under-voltage circuit |
| CN108173424A (en) * | 2017-12-25 | 2018-06-15 | 四川长虹电器股份有限公司 | A kind of portable device supply power soft switch system |
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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: 20140521 Termination date: 20171220 |
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| CF01 | Termination of patent right due to non-payment of annual fee |