CN102570406B - Battery protection device - Google Patents
Battery protection device Download PDFInfo
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- CN102570406B CN102570406B CN201110411181.3A CN201110411181A CN102570406B CN 102570406 B CN102570406 B CN 102570406B CN 201110411181 A CN201110411181 A CN 201110411181A CN 102570406 B CN102570406 B CN 102570406B
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Abstract
The invention discloses a battery protection device for protecting a battery, and aims to simplify a technical flow of producing a printed circuit board. A chip comprises a control circuit module, a charging and discharging detection module, a switch with a control end, a voltage abnormity detection module and a capacitor, wherein the control circuit module is connected with a power input end and used for controlling the switch-on or switch-off of a charging and discharging circuit; the charging and discharging detection module is connected with the power input end; a control end of the charging and discharging detection module is connected with the control circuit module; the charging and discharging detection module is used for sending a control signal to the control circuit module according to an input situation of input voltage and instructing the control circuit module to control the switch-on or switch-off of the charging and discharging circuit; the switch with the control end is connected in series between a branch circuit formed by parallelly connecting the control circuit module and the charging and discharging detection module and the power input end; the voltage abnormity detection module is connected in series between the power input end and the control end of the switch and used for controlling the switch to turn on when the input voltage is detected to be normal and controlling the switch to turn off when the input voltage is detected to be abnormal; and the capacitor is connected in parallel with the charging and discharging detection module.
Description
Technical field
The present invention relates to electronic technology and built-in field, particularly relate to battery protecting apparatus.
Background technology
Battery protection chip is installed in battery usually, and at such as mobile phone cell inner, have the printed circuit board (PCB) (Printed Circuit Board, PCB) of a piece very little, battery protection chip is just arranged on this printed circuit board (PCB).Battery protection chip provides and controls battery charging and discharging together with other auxiliary element.Usually lithium ion battery and lithium polymer battery is applied in.The basic function of battery protection chip comprises overvoltage charge protection, overvoltage discharge prevention, electric discharge overcurrent protection and short-circuit protection.Overvoltage charge protection refer to when battery be charged to cell voltage exceed overvoltage charge threshold (such as 4.3V) time, battery protection chip control turn off charge circuit.When overvoltage discharge prevention refers to that battery is discharged to battery low pressure lower than overvoltage discharge threshold (such as 2.5V), battery protection chip controls to turn off discharge loop.Electric discharge overcurrent protection refers to when discharge load electric current is excessive, and when exceeding electric discharge overcurrent threshold value, battery protection chip controls to turn off discharge loop.Short-circuit protection refers to when discharge load electric current is excessive, and when exceeding short-circuit threshold value, battery protection chip controls to turn off discharge loop.With the difference of electric discharge overcurrent protection, short-circuit protection is that the current threshold of short-circuit protection is higher, but time delay is shorter.Such as short-circuit threshold value is 20A, and time delay is 0.1mS, and electric discharge overcurrent threshold value is 3A, and time delay is 12mS.
Shown in Figure 1, battery protection chip is the part in dotted line frame.Power input is VDD and VM, VDD and VM represents the magnitude of voltage of this relevant position simultaneously, and G represents GND voltage, and VMI represents the voltage of VM after resistance R2, and VDDI represents the voltage of VDD after resistance R1, DO and CO represents gauge tap.The printed circuit board (PCB) of battery protection exists resistance R1 and electric capacity C1.The use of resistance R1 and electric capacity C1 is, when there is the inner micro-short circuit of battery core or external loading short circuit, electric capacity C1 can discharge electric charge, ensures that chip can normally work, and does not occur mistake.Wherein, the span of resistance R1 is 100 ohm ~ 1K ohm, and the span of electric capacity C1 is 0.01 microfarad ~ 0.22 microfarad.Preferably, the representative value of resistance R1 is 470 ohm, and the representative value of electric capacity C1 is 0.1 microfarad.
But when producing printed circuit board (PCB), need to encapsulate resistance R1 and electric capacity C1 and weld, technique is more complicated, and cost is higher.
Summary of the invention
The embodiment of the present invention provides a kind of battery protecting apparatus, for realizing the protection to battery, and simplifies the technological process of producing printed circuit board (PCB).
A kind of battery protection chip, comprising:
Control circuit module, connects power input, for controlling being turned on or off of charge-discharge circuit;
Discharge and recharge detection module, connect power input, and the control end of described discharge and recharge detection module and control circuit model calling, for transmitting control signal to control circuit module according to input voltage, instruction control circuit module controls being turned on or off of charge-discharge circuit;
With the switch of control end, the control end of the switch of described band control end is connected with electric voltage exception detection module, and two links are in control circuit module and the path between discharge and recharge detection module and power input;
Electric voltage exception detection module, connect power input, comprise: wave filter, voltage source and comparator, described wave filter comprises filter resistance and filter capacitor, for carrying out filtering to input voltage, filtered input voltage is provided, described voltage source is used for providing constant voltage, described comparator is used for described input voltage compared with voltage difference, when described input voltage is lower than described voltage difference, the switch controlling described band control end disconnects, otherwise the switch controlling described band control end closes, wherein, described voltage difference is that described filtered input voltage and described constant voltage do the poor difference obtained, or
Described comparator be used for by voltage with value compared with described filtered input voltage, at described voltage with when being worth lower than described filtered input voltage, the switch controlling described band control end disconnects, otherwise the switch controlling described band control end closes, wherein, described voltage and value be described input voltage and described constant voltage do and obtain and value;
Electric capacity, its one end is connected with earth terminal, and the switch of the other end and described band control end, control circuit module and discharge and recharge detection module are connected;
Wherein, switch and the described electric capacity of described electric voltage exception detection module, described band control end realize all in the chips, once complete in production chip processes.
In chip, electric voltage exception detection module, gate-controlled switch and electric capacity is devised in the embodiment of the present invention.Electric voltage exception detection module is when detecting that input voltage is normal, and gauge tap closes, and for subsequent conditioning circuit is powered, and makes capacitor charging.Electric voltage exception detection module is when detecting that input voltage is abnormal, and gauge tap disconnects, and now capacitor discharge, makes follow-up discharge and recharge detection module still can work a period of time.The embodiment of the present invention is particularly useful for situation abnormal in the input voltage short time.Because electric voltage exception detection module, gate-controlled switch and electric capacity in the present embodiment realize all in the chips, once complete in production chip processes.When producing printed circuit board (PCB), only needing chip, not needing extra encapsulation and welding procedure, because this simplify the technological process of producing printed circuit board (PCB).
Accompanying drawing explanation
Fig. 1 is the structure chart of PCB in prior art;
Fig. 2 is the primary structure figure of battery protecting apparatus in the embodiment of the present invention;
Fig. 3 and Fig. 4 is the structure chart of electric voltage exception detection module in the embodiment of the present invention;
Fig. 5 is the detailed structure view of battery protecting apparatus in the embodiment of the present invention;
Fig. 6 is the structure chart of the electric voltage exception detection module with delay function in the embodiment of the present invention.
Detailed description of the invention
In chip, electric voltage exception detection module, gate-controlled switch and electric capacity is devised in the embodiment of the present invention.Electric voltage exception detection module is when when detecting that battery charges, the input voltage of battery charger is normal, and gauge tap closes, and for subsequent conditioning circuit is powered, and makes capacitor charging.Electric voltage exception detection module is when detecting that above-mentioned input voltage is abnormal, and gauge tap disconnects, and now capacitor discharge, makes follow-up discharge and recharge detection module still can work a period of time.The embodiment of the present invention is particularly useful for situation abnormal in the input voltage short time of battery charger when battery charges.Because electric voltage exception detection module, gate-controlled switch and electric capacity in the present embodiment realize all in the chips, once complete in production chip processes.When producing printed circuit board (PCB), only needing chip, not needing extra encapsulation and welding procedure, because this simplify the technological process of producing printed circuit board (PCB).
See Fig. 2, the chip 200 in the present embodiment comprises: control circuit module 201, discharge and recharge detection module 202, the switch S 1 being with control end, electric voltage exception detection module 203 and electric capacity C2.
Control circuit module 201 and discharge and recharge detection module 202 connect power input VDD by switch S 1.Control circuit module 201 is for controlling being turned on or off of charge-discharge circuit 204.Wherein charge-discharge circuit 204 comprises gauge tap DO and CO.
Discharge and recharge detection module 202 is also connected with control circuit module 201 simultaneously, transmits control signal to control circuit module 201 for the input voltage according to power input VDD, and instruction control circuit module 201 controls being turned on or off of charge-discharge circuit 204.Discharge and recharge detection module 202 comprises overcharge detecting unit in parallel, short detection unit, overdischarge detecting unit and electric discharge over-current detection unit.The function of each unit of discharge and recharge detection module 202 is see the introduction of background technology part.
Switch S 1 with control end, its control end is connected with electric voltage exception detection module 203, two links in control circuit module 201 and the path between discharge and recharge detection module 202 and power input VDD, for realizing control circuit module 201 and discharge and recharge detection module 202 with the connection of power input VDD or disconnection.
Electric voltage exception detection module 203 connects the control end of power input VDD and switch S 1.Electric voltage exception detection module 203 is when detecting that the input voltage of power input VDD is normal, and gauge tap S1 closes, and when detecting that input voltage is abnormal, gauge tap S1 disconnects.
Electric capacity C2, its one end is connected with earth terminal, and the other end is connected with switch S 1, control circuit module 201 and discharge and recharge detection module 202.
Concrete, see Fig. 3, electric voltage exception detection module 203 comprises: comparator 2031, for the input voltage V according to power input VDD
dDgauge tap S1 disconnects or closes.Due to the input voltage V of power input VDD
dDtoo lowly belong to abnormal.Therefore, comparator 2031 is at input voltage V
dDwhen being not less than predeterminated voltage thresholding, exporting and be used for the closed signal of gauge tap S1, otherwise export the signal being used for gauge tap S1 and disconnecting.
Preferably, in the present embodiment, predeterminated voltage thresholding can be realized by input voltage and a constant voltage.There is multiple specific implementation, mode one: stable input voltage and constant voltage are done difference, obtain predeterminated voltage thresholding.Mode two: using stable input voltage as predeterminated voltage thresholding, then by input voltage and constant voltage and compare with predeterminated voltage thresholding, it is equivalent to and stable input voltage and constant voltage is done difference, is then compared with predeterminated voltage thresholding by input voltage.
So electric voltage exception detection module 203 also comprises: wave filter 2032 and voltage source 2033.
Wave filter 2032 is for the input voltage V to power input VDD
dDcarry out filtering.Wave filter 2032 comprises resistance R4 and electric capacity C4.
For mode one, shown in Figure 3, voltage source 2033 is connected with wave filter 2032, for providing constant voltage V1, and filtered for wave filter 2032 input voltage VF and constant voltage V1 being done difference, obtaining threshold voltage VS and exporting to comparator.
For mode two, shown in Figure 4, wave filter 2032 is directly connected with comparator 2031.Voltage source 2033 for providing constant voltage V1, and by input voltage V
dDwith constant voltage V1 do and, obtain output voltage VN and export to comparator.
When employing mode for the moment, normal V
dDone tunnel directly enters comparator 2031, and another road after filtering device 2032 becomes VF, and then VF and VI does difference and obtains VS, comparator 2031 couples of V
dDcompare with VS, determine V
dDhigher than VS, then the signal VG (as low level signal) that output control switch S1 is closed.Switch S 1 closes, then V
dDfor electric capacity C2 charges, and power for discharge and recharge detection module 202 and control circuit module 201.Charge-discharge circuit 204 remains closed simultaneously.Battery charger is battery charging or battery discharge.
V
dDoccur abnormal, when dropping to a certain degree instantaneously, directly enter the V of comparator 2031
dDobvious decline, the VF of device is substantially constant under the effect of wave filter after filtering, and because VI is constant, then VS is substantially constant.Comparator 2031 couples of V
dDcompare with VS, determine V
dDlower than VS, then the signal VG (as high level signal) of output control switch S1 disconnection.Switch S 1 disconnects, then electric capacity C2 discharges, discharge and recharge detection module 202 and working in control circuit module 201 short time.Meanwhile, discharge and recharge detection module 202 also detects V
dDoccur abnormal, then transmit control signal to control circuit module 201, instruction control circuit module 201 controls charge-discharge circuit 204 and disconnects.
V
dDwhen recovering normal, the signal VG (as low level signal) that comparator 2031 output control switch S1 is closed.Switch S 1 closes.Meanwhile, discharge and recharge detection module 202 transmits control signal to control circuit module 201, and instruction control circuit module 201 controls charge-discharge circuit 204 and closes.
When the mode two of employing, normal V
dDone tunnel becomes VF after wave filter 2032, and another road and VI do and obtain VN.Comparator 2031 couples of VF and VN compare, and determine that VN is higher than VF, then the signal VG (as low level signal) that output control switch S1 is closed.Switch S 1 closes, then VDD is that electric capacity C2 charges, and powers for discharge and recharge detection module 202 and control circuit module 201.Charge-discharge circuit 204 remains closed simultaneously.Battery charger is that battery charging or battery pass through load discharge.
V
dDoccur abnormal, when dropping to a certain degree instantaneously, the VF of device is substantially constant under the effect of wave filter after filtering, and because VI is constant, then VN obviously declines.Comparator 2031 couples of VF and VN compare, and determine that VN is lower than VF, then the signal VG (as high level signal) of output control switch S1 disconnection.Switch S 1 disconnects, then electric capacity C2 discharges, discharge and recharge detection module 202 and working in control circuit module 201 short time.Meanwhile, discharge and recharge detection module 202 also detects V
dDoccur abnormal, then transmit control signal to control circuit module 201, instruction control circuit module 201 controls charge-discharge circuit 204 and disconnects.
V
dDwhen recovering normal, the signal VG (as low level signal) that comparator 2031 output control switch S1 is closed.Switch S 1 closes.Meanwhile, discharge and recharge detection module 202 transmits control signal to control circuit module 201, and instruction control circuit module 201 controls charge-discharge circuit 204 and closes.
Preferably, in the present embodiment, the scope of C2 is 0.1pF ~ 100pF, and preferred value is 10pF.When other conditions permits, C2 capacitance is larger, and the voltage-regulation coefficient of VC node is better, and certainly too large, the chip area taken is larger.The preferred value of R4 is the preferred value of 100K Ω, C4 is 10pF.
Lithium battery voltage VBAT is generally 3.7V.Consider that the present embodiment is in order to realize the time constant suitable with prior art then: (VBAT/Id) .C2=R1.C1, wherein VBAT is cell voltage, Id is circuit power consumption, C2 is the capacitance of electric capacity C2 in the present invention, R1 is the resistance value of resistance R1 in Fig. 1, and C1 is the capacitance of electric capacity C1 in Fig. 1.For C1=0.1 μ F, R1=470 Ω, VBAT=3.7V, C2=10pF, then Id=(3.7VX10pF)/(470 Ω X0.1 μ F)=0.79 μ A, in order to the longer time keeps VC node voltage to stablize, circuit power consumption electric current I d should be the smaller the better, so Id should design be less than 0.79 μ A.When electric voltage exception detection module 203 detects that VDD declines suddenly, should cut-off switch S1, and other power consuming circuit can be controlled enter low power consumpting state, and under meeting low power consumpting state, total power consumption is less than 0.79 μ A.
In order to avoid VDD to decline further when VDD exception being detected, electric voltage exception detection module 203 can also be connected with control circuit module 201 in another embodiment, for detecting that input voltage VDD is abnormal and after postponing certain hour, to control circuit module 201 forward delay interval timing signal, control charge-discharge circuit 204 is disconnected, shown in Figure 5.
Concrete, comparator 2031 is except the signal VG exported for gauge tap S1, also need to export the road signal for controlling control circuit module 201, this road signal outputs to control circuit module 201 after certain time-delay, make control circuit module 201 that signal DO is set to low level, thus cut off discharge path.
In order to realize signal lag, shown in Figure 6, in the present embodiment, electric voltage exception detection module 203 also comprises: delay unit 2034 and with door AND.
The delay unit 2034 be connected with the output of comparator 2031, export for after the signal lag that exported by comparator 2031, the signal after time delay is VK.Delay unit 2034 can be realized by amplifier.
With door AND, for comparator 2031 and the output signal of delay unit 2034 are carried out with, obtain time delay timing signal VDL, and export to control circuit module 201.Such as, in the present embodiment when VDD is abnormal, comparator 2031 exports high level signal, also be high level through the signal VK of time delay, then export the signal VDL of high level to control circuit module 201, make control circuit module 201 that signal DO is set to low level, thus cut off discharge path.
In order to charge for electric capacity C2 fast and power for discharge and recharge detection module 202 and control circuit module 201 after VDD recovers, shown in Figure 5, chip 200 can also comprise: the diode D1 in parallel with switch S 1, for the conducting when power input voltage VDD recovers normal, make power input voltage VDD be that electric capacity C2 charges, and power for control circuit module 201 and discharge and recharge detection module 202.
Preferably, for simplifying circuit complexity, the function of switch S 1 and diode D1 can be realized by FET, and the present embodiment adopts PMOS, that is adopts PMOS as switch S 1, can realize the function of diode D1 simultaneously.
In chip, electric voltage exception detection module, gate-controlled switch and electric capacity is devised in the embodiment of the present invention.Electric voltage exception detection module is when detecting that input voltage is normal, and gauge tap closes, and for subsequent conditioning circuit is powered, and makes capacitor charging.Electric voltage exception detection module is when detecting that input voltage is abnormal, and gauge tap disconnects, and now capacitor discharge, makes follow-up discharge and recharge detection module still can work a period of time.The embodiment of the present invention is particularly useful for situation abnormal in the input voltage short time.Because electric voltage exception detection module, gate-controlled switch and electric capacity in the present embodiment realize all in the chips, once complete in production chip processes.When producing printed circuit board (PCB), only needing chip, not needing extra encapsulation and welding procedure, because this simplify the technological process of producing printed circuit board (PCB).The embodiment of the present invention also sends signal to control circuit module 201 by electric voltage exception detection module after time delay, and charge-discharge circuit 204 is disconnected, and prevents VDD from continuing to decline.In addition, the embodiment of the present invention also provides the diode with switch in parallel, charges, and power for control circuit module 201 and discharge and recharge detection module 202 to be rapidly to electric capacity C2 when VDD recovers by diode.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (6)
1. a battery protection chip, is characterized in that, comprising:
Control circuit module, connects power input, for controlling being turned on or off of charge-discharge circuit;
Discharge and recharge detection module, connect power input, and the control end of described discharge and recharge detection module and control circuit model calling, for transmitting control signal to control circuit module according to input voltage, instruction control circuit module controls being turned on or off of charge-discharge circuit;
With the switch of control end, the control end of the switch of described band control end is connected with electric voltage exception detection module, and two links are in control circuit module and the path between discharge and recharge detection module and power input;
Electric voltage exception detection module, connect power input, comprise: wave filter, voltage source and comparator, described wave filter comprises filter resistance and filter capacitor, for carrying out filtering to input voltage, filtered input voltage is provided, described voltage source is used for providing constant voltage, described comparator is used for described input voltage compared with voltage difference, when described input voltage is lower than described voltage difference, the switch controlling described band control end disconnects, otherwise the switch controlling described band control end closes, wherein, described voltage difference is that described filtered input voltage and described constant voltage do the poor difference obtained, or
Described comparator be used for by voltage with value compared with described filtered input voltage, at described voltage with when being worth lower than described filtered input voltage, the switch controlling described band control end disconnects, otherwise the switch controlling described band control end closes, wherein, described voltage and value be described input voltage and described constant voltage do and obtain and value;
Electric capacity, its one end is connected with earth terminal, and the switch of the other end and described band control end, control circuit module and discharge and recharge detection module are connected;
Wherein, switch and the described electric capacity of described electric voltage exception detection module, described band control end realize all in the chips, once complete in production chip processes.
2. battery protection chip as claimed in claim 1; it is characterized in that, electric voltage exception detection module also with control circuit model calling, for detecting that input voltage is abnormal and after postponing certain hour; to control circuit module forward delay interval timing signal, control charge-discharge circuit is disconnected.
3. battery protection chip as claimed in claim 2, it is characterized in that, electric voltage exception detection module comprises:
Comparator, during for being not less than predeterminated voltage thresholding at input voltage, exports the signal that the switch for controlling described band control end closes, otherwise exports the signal of the switch disconnection for controlling described band control end;
The delay unit be connected with the output of comparator, exports for after the signal lag that exported by comparator;
With door, for comparator and the output signal of delay unit are carried out with, obtain time delay timing signal, and export to control circuit module.
4. battery protection chip as claimed in claim 1, is characterized in that, also comprise:
With the diode of the switch in parallel of described band control end, for the conducting when described input voltage recovers normal, make described input voltage be capacitor charging, and power for control circuit module and discharge and recharge detection module.
5. battery protection chip as claimed in claim 1, it is characterized in that, the switch of described band control end is FET.
6. battery protection chip as claimed in claim 1, is characterized in that, discharge and recharge detection module comprises overcharge detecting unit in parallel, short detection unit, overdischarge detecting unit and electric discharge over-current detection unit.
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| CN201110411181.3A CN102570406B (en) | 2011-12-09 | 2011-12-09 | Battery protection device |
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| CN201110411181.3A CN102570406B (en) | 2011-12-09 | 2011-12-09 | Battery protection device |
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| CN102570406A CN102570406A (en) | 2012-07-11 |
| CN102570406B true CN102570406B (en) | 2015-03-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103199504B (en) * | 2013-04-18 | 2015-09-09 | 无锡中星微电子有限公司 | A kind of battery protecting circuit with booster circuit |
| CN103219709B (en) * | 2013-04-18 | 2015-04-15 | 无锡中星微电子有限公司 | Battery protective circuit with single charge-discharge power tube |
| CN103490474B (en) * | 2013-09-26 | 2016-03-23 | 无锡中感微电子股份有限公司 | A kind of electric power management circuit |
| CN103532104B (en) * | 2013-10-17 | 2016-06-01 | 无锡中感微电子股份有限公司 | A kind of battery protecting circuit |
| CN103633628B (en) * | 2013-11-22 | 2016-06-15 | 无锡中感微电子股份有限公司 | A kind of battery protecting circuit |
| US9214198B2 (en) * | 2014-04-30 | 2015-12-15 | Sandisk Enterprise Ip Llc | Continuous capacitor health monitoring and power supply system |
| CN104821555B (en) * | 2015-05-11 | 2017-12-08 | 无锡中感微电子股份有限公司 | The battery protecting circuit of precision current sampling can be carried out |
| CN105162078B (en) * | 2015-10-15 | 2018-02-23 | 广东欧珀移动通信有限公司 | The charge protector and method and terminal of a kind of terminal |
| CN107171290B (en) * | 2017-07-20 | 2019-07-26 | 无锡中感微电子股份有限公司 | Battery protecting circuit |
| CN108649636A (en) * | 2018-05-21 | 2018-10-12 | 杭州云动智能汽车技术有限公司 | High-power charge-discharge control circuit applied to car-mounted terminal |
| KR102502388B1 (en) * | 2018-06-19 | 2023-02-23 | 에이치엘만도 주식회사 | Control device and method for EPS power supply in vehicle |
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| CN102570406A (en) | 2012-07-11 |
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