CN103855689A - Cascaded battery protection circuit and system - Google Patents
Cascaded battery protection circuit and system Download PDFInfo
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- CN103855689A CN103855689A CN201410124389.0A CN201410124389A CN103855689A CN 103855689 A CN103855689 A CN 103855689A CN 201410124389 A CN201410124389 A CN 201410124389A CN 103855689 A CN103855689 A CN 103855689A
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Abstract
The invention provides a cascaded battery protection circuit and a cascaded battery protection system. The cascaded battery protection circuit comprises a plurality of electric core protection units, wherein each electric core protection unit comprises a discharge protection output end, a discharge protection input end, a current detection end and a negative voltage detection end; each of the electric core protection units except for the electric core protection unit of the bottommost stage receives a discharge overvoltage protection signal output by the negative voltage detection end of the electric core protection unit of the next stage; each of the electric core protection units except for the electric core protection unit of the uppermost state enters a discharge overvoltage protection state when the discharge overvoltage signal which is generated or received by the electric core protection unit is abnormal, generates and outputs a discharge overvoltage protection signal to the current detection end of the electric core protection unit of the uppermost stage through the negative voltage detection end of the previous electric core protection unit, and then enters a low-power-consumption mode. Compared with the prior art, the cascaded battery protection circuit realizes uploading of the discharge overvoltage protection signal on the basis that a pin is not added, so that all the electric core protection units can enter the low-power-consumption mode.
Description
[technical field]
The present invention relates to a kind of electric power management circuit, particularly the battery protecting circuit of cascade and system.
[background technology]
The advantages such as energy is high, cell voltage is high owing to having for lithium ion battery, working stability wide ranges, storage life length, be widely used in military and civilian compact electric apparatus, as mobile phone, portable computer, video camera, camera etc., part has replaced conventional batteries.But because of its physical characteristic, in use, lithium battery is very strict to charging current, discharging current, voltage and temperature requirement, will in safety He on the life-span, produce serious consequence once exceed.Therefore, lithium ion battery, discharging and recharging in the course of work, need to monitor and control key parameters such as its overcharge voltage, overdischarge voltage, charging Limited Current and electric discharge Limited Currents, to prevent that battery excessive loss from guaranteeing the safety in use simultaneously.The protective circuit of single lithium battery is very ripe at present, but organizes for the lithium battery (or battery core unit) of multi-section serial, and setting up the protective circuit of mating with it has certain difficulty.
Fig. 1 shows the battery protection system of a kind of cascade of the prior art.Described battery protection system comprise successively series connection multiple battery cores unit V1, V2, Vn, multiple battery core protected location 1,2, n, charge switch pipe MC, discharge switch pipe MD, detect resistance R sense, malleation clamper tube MX.Each battery core protected location comprises the first power end VDD, second source end VSS, charge protection input IOC, charge protection output COUT, discharge prevention input IOD, discharge prevention output DOUT, and annexation as shown in Figure 1.
In the application shown in Fig. 1, the electric discharge overvoltage signal of higher level's battery core protected location can be passed to subordinate's battery core protected location, until be passed to subordinate battery core protected location 1, realizes the job control of discharge loop.In subordinate, battery core protected location 1 output signal is cut off after described discharge switch pipe MD, and subordinate battery core protected location will enter low-power consumption mode, but now all higher level's battery core protected locations still do not enter low-power consumption mode.These battery core protected locations that do not enter low-power consumption mode still can consume larger electric current.
Therefore, be necessary to provide a kind of improved technical scheme to overcome the problems referred to above.
[summary of the invention]
The object of the present invention is to provide a kind of battery protecting circuit and system; on the basis that does not increase pin, realize uploading of relevant electric discharge overvoltage protection signal; make all battery core protected locations can enter low-power consumption mode in the time there is the situation of electric discharge overvoltage, thereby reduced power consumption.
In order to address the above problem, according to an aspect of the present invention, the invention provides a kind of battery protecting circuit, for multiple battery core unit of series connection are successively protected, it comprises multiple battery core protected locations, each battery core protected location is connected between the both positive and negative polarity of corresponding battery core unit, each battery core protected location comprises discharge prevention output, discharge prevention input, current detecting end and detection of negative pressure end, the discharge prevention output of higher level's battery core protected location that the discharge prevention input of the each battery core protected location except higher level's battery core protected location is adjacent is connected, the discharge prevention input of higher level's battery core protected location connects and represents normal electric discharge overvoltage protection signal, the current detecting end of higher level's battery core protected location that the detection of negative pressure end of the each battery core protected location except higher level's battery core protected location is adjacent is connected, whether abnormal each battery core protected location carry out discharge examination to obtain representing current electric discharge overvoltage protection signal to corresponding battery core unit, the whether abnormal higher level of expression that each battery core protected location except higher level's battery core protected location also can receive the discharge prevention output output of its adjacent higher level's battery core protected location by its discharge prevention input overvoltage protection signal that discharges, each battery core protected location except subordinate battery core protected location is also received the whether abnormal subordinate's electric discharge overvoltage protection signal of expression of the detection of negative pressure end output of its adjacent subordinate's battery core protected location by its current detecting termination, each battery core protected location except higher level's battery core protected location and subordinate battery core protected location is abnormal at current electric discharge overvoltage protection signal, higher level discharges and when overvoltage protection signal is abnormal for abnormal or subordinate's electric discharge overvoltage protection signal, enters electric discharge overvoltage protection state, generate and pass through its discharge prevention output output and represent the discharge prevention input of abnormal electric discharge overvoltage protection signal to subordinate's battery core protected location, generate and pass through its detection of negative pressure end output and represent the current detecting end of abnormal electric discharge overvoltage protection signal to higher level's battery core protected location, proceed to subsequently low-power consumption mode.
Further, the discharge prevention output of subordinate battery core protected location is connected with the control end of discharge switch pipe, the current detecting end of subordinate battery core protected location is connected by the negative pole that detects the battery core unit that resistance is corresponding with subordinate battery core protected location, subordinate battery core protected location enters electric discharge overvoltage protection state when overvoltage protection signal is abnormal for abnormal or higher level discharge at current electric discharge overvoltage protection signal, generate and pass through its discharge prevention output output and represent that abnormal electric discharge overvoltage protection signal is to described discharge switch pipe, described discharge switch pipe cuts off discharge loop, generate simultaneously and pass through its detection of negative pressure end output and represent the current detecting end of abnormal electric discharge overvoltage protection signal to higher level's battery core protected location, subsequently, subordinate battery core protected location enters low-power consumption mode, the detection of negative pressure end of higher level's battery core protected location is unsettled or connect predetermined level, higher level's battery core protected location enters electric discharge overvoltage protection state while being abnormal at current electric discharge overvoltage protection signal for abnormal or subordinate's electric discharge overvoltage protection signal, generate and pass through its discharge prevention output output and represent the discharge prevention input of abnormal electric discharge overvoltage protection signal to subordinate's battery core protected location, proceed to subsequently low-power consumption mode.
Further, described battery protecting circuit also comprises: be arranged at the circuit of uploading between two adjacent battery core protected locations, be arranged at the signal sending circuit in subordinate's battery core protected location and be arranged at the signal receiving circuit in higher level's battery core protected location, in the time that subordinate's battery core protected location enters electric discharge overvoltage protection state, the signal sending circuit of this subordinate's battery core protected location draws high the level of described detection of negative pressure end to the maximum level of its corresponding battery core unit, cause described transfer circuit work, so that the voltage of the electric current electrical measurement end of this higher level's battery core protected location is pulled low to the minimum voltage lower than its corresponding battery core unit, the signal receiving circuit of this higher level's battery core protected location is at the voltage of determining its current detecting end during lower than the minimum voltage of its corresponding battery core unit, think that the detection of negative pressure end output that receives its adjacent subordinate's battery core protected location represents abnormal subordinate's electric discharge overvoltage protection signal.
Further, the described circuit of uploading comprises switching tube and the first resistance, the current detecting end of higher level's battery core protected location is connected to the negative pole of its corresponding battery core unit by described the first resistance, the current detecting end of higher level's battery core protected location is also connected to the first link of described switching tube, the second link of described switching tube connects a node, the voltage of this node is lower than the ceiling voltage of battery core unit corresponding to subordinate's battery core protected location, the control end of described switching tube is connected to the detection of negative pressure end of subordinate's battery core protected location, in the time that the level of described detection of negative pressure end is drawn high the maximum level to its corresponding battery core unit by the signal sending circuit of subordinate's battery core protected location, described switching tube conducting, cause the voltage of current detecting end of higher level's battery core protected location lower than the minimum voltage of battery core unit corresponding to higher level's battery core protected location.
Further; described switching tube is nmos pass transistor; the drain electrode of described nmos pass transistor is as the first link of switching tube; source electrode is as the second link; grid is as the control end of switching tube, and the difference of the voltage of the node that the ceiling voltage of the battery core unit that subordinate's battery core protected location is corresponding is connected with the second link of described switching tube exceedes the on state threshold voltage of described nmos pass transistor.
Further, described in upload circuit and comprise and also comprise the second resistance, the current detecting end of described higher level's battery core protected location is connected to the first link of described switching tube by the second resistance.
Further, each battery core unit includes multiple battery cores of series connection successively.
Further; each battery core protected location comprises charge protection output and charge protection input; the charge protection output of the upper level battery core protected location that the charge protection input of the each battery core protected location except higher level's battery core protected location is adjacent is connected; the charge protection input of higher level's battery core protected location connects and represents normal charge protection signal; the charge protection output of subordinate battery core protected location is connected with the control end of charge protection switch, and charge switch pipe, discharge switch pipe are connected in successively load and detect between resistance.
According to a further aspect in the invention, the invention provides a kind of battery protection system, it comprises battery pack, switch combination circuit and battery protecting circuit, described battery pack comprises multiple battery core unit of series connection successively, a link of higher level's battery core unit is connected with the first outside link, a link of subordinate's battery core unit is successively by detecting resistance, described switch combination circuit is connected in the second outside link, described switch combination circuit comprises charge switch pipe and the discharge switch pipe of series connection, described battery protecting circuit is for protecting multiple battery core unit of series connection successively, it comprises multiple battery core protected locations, each battery core protected location is connected between the both positive and negative polarity of corresponding battery core unit, each battery core protected location comprises discharge prevention output, discharge prevention input, current detecting end and detection of negative pressure end, the discharge prevention output of higher level's battery core protected location that the discharge prevention input of the each battery core protected location except higher level's battery core protected location is adjacent is connected, the discharge prevention input of higher level's battery core protected location connects and represents normal electric discharge overvoltage protection signal, the current detecting end of higher level's battery core protected location that the detection of negative pressure end of the each battery core protected location except higher level's battery core protected location is adjacent is connected, whether abnormal each battery core protected location carry out discharge examination to obtain representing current electric discharge overvoltage protection signal to corresponding battery core unit, the whether abnormal higher level of expression that each battery core protected location except higher level's battery core protected location also can receive the discharge prevention output output of its adjacent higher level's battery core protected location by its discharge prevention input overvoltage protection signal that discharges, each battery core protected location except subordinate battery core protected location is also received the whether abnormal subordinate's electric discharge overvoltage protection signal of expression of the detection of negative pressure end output of its adjacent subordinate's battery core protected location by its current detecting termination, each battery core protected location except higher level's battery core protected location and subordinate battery core protected location is abnormal at current electric discharge overvoltage protection signal, higher level discharges and when overvoltage protection signal is abnormal for abnormal or subordinate's electric discharge overvoltage protection signal, enters electric discharge overvoltage protection state, generate and pass through its discharge prevention output output and represent the discharge prevention input of abnormal electric discharge overvoltage protection signal to subordinate's battery core protected location, generate and pass through its detection of negative pressure end output and represent the current detecting end of abnormal electric discharge overvoltage protection signal to higher level's battery core protected location, proceed to subsequently low-power consumption mode.
Compared with prior art; in battery protecting circuit and system in the present invention; current detecting end and detection of negative pressure by two adjacent battery core protected locations are brought in uploading of realization charging overvoltage signal; on the basis that does not increase pin, realize uploading of relevant electric discharge overvoltage protection signal; make all battery core protected locations can enter low-power consumption mode in the time there is the situation of electric discharge overvoltage; thereby reduce power consumption, overcome the problem of mentioning in background.
[accompanying drawing explanation]
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, 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.Wherein:
Fig. 1 is the circuit diagram of battery protection system of the prior art;
Fig. 2 is battery protection system in the present invention structural representation in one embodiment.
[embodiment]
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Alleged " embodiment " or " embodiment " refers to special characteristic, structure or the characteristic that can be contained at least one implementation of the present invention herein.Different local in this manual " in one embodiment " that occur not all refer to same embodiment, neither be independent or the embodiment mutually exclusive with other embodiment optionally.Unless stated otherwise, the word that connection herein, the expression that is connected, joins are electrically connected all represents to be directly or indirectly electrical connected.N is herein more than or equal to 2 natural number, more than two of multiple expressions or two, connection in literary composition, join, the word such as series connection can be understood as indirectly or directly and connects and join, connect.
Please refer to shown in Fig. 2, it is the structured flowchart in one embodiment of the battery protection system in the present invention.This battery protection system comprises battery core unit V1, V2, V3 and Vn, discharge switch pipe MD, charge switch pipe MC, detection resistance R sense, the battery protecting circuit 200 of multiple series connection successively.Battery protecting circuit 200 comprises multiple battery core protected locations 1,2,3 and n.A link of higher level's battery core unit Vn is connected with one end of load resistance RL as the first outside link, a link of subordinate's battery core unit V1 successively by detecting resistance, discharge switch pipe MD is connected with the second outside link with charge switch pipe MC, this second outside link is connected with the other end of load resistance RL.Discharge switch pipe MD and charge switch pipe MC form switch combination circuit, and the battery core unit V1 of series connection, V2, V3 and Vn form battery pack successively.
In one embodiment; as shown in Figure 2; each battery core unit includes multiple battery cores of series connection successively; the corresponding link of the battery core protected location that the positive pole of each battery core is corresponding with described battery core unit with the negative pole (not shown) that is connected; this part belongs to existing known content, therefore also not shown in Fig. 2.
Each battery core protected location 1,2,3 and n are connected between corresponding battery core unit V1, V2, V3 and the both positive and negative polarity of Vn; such as battery core protected location 1 is connected between the both positive and negative polarity of battery core unit 1, battery core protected location n is connected between the both positive and negative polarity of battery core unit n etc.Each battery core protected location includes the first power end VDD, second source end VSS; wherein the first power end VDD is connected with the positive pole of corresponding battery core unit; second source end VSS is connected with the negative pole of corresponding battery core unit, and each battery core protected location is also the relation of series connection mutually.For sake of clarity, the battery core protected location n corresponding with higher level's battery core unit Vn is called as higher level's battery core protected location, and the battery core protected location 1 corresponding with subordinate's battery core unit V1 is called as subordinate battery core protected location.
Each battery core protected location 1,2,3 and n also comprise discharge prevention output DOUT, discharge prevention input IOD, charge protection output COUT, charge protection input IOC, current detecting end VL, detection of negative pressure end VM.
The discharge prevention output DOUT of the upper level battery core protected location that the discharge prevention input IOD of the each battery core protected location except higher level's battery core protected location n is adjacent is connected, such as the discharge prevention input IOD of battery core protected location 1 and the discharge prevention output DOUT of battery core protected location 2 are connected.The discharge prevention input of higher level's battery core protected location connects the electric discharge overvoltage protection signal that represents normal (being absence of discharge overvoltage or non-abnormal).The discharge prevention output DOUT of subordinate battery core protected location 1 is connected with the control end of discharge switch pipe MD; in the time that subordinate battery core protected location 1 represents the electric discharge overvoltage protection signal of abnormal (overvoltage of discharging) by described discharge prevention output DOUT output, described discharge switch pipe MD cuts off discharge loop.
The charge protection output COUT of the upper level battery core protected location that the charge protection input IOC of the each battery core protected location except higher level's battery core protected location n is adjacent is connected; such as the charge protection input IOC of battery core protected location 1 and the charge protection output COUT of battery core protected location 2 are connected; the charge protection input of higher level's battery core protected location n connects and represents normal charge protection signal, and the charge protection output COUT of subordinate battery core protected location 1 is connected with the control end of charge protection switch.In the time that subordinate battery core protected location 1 represents the charge protection signal of abnormal (overvoltage or charging overcurrent charge) by described charge protection output COUT output, described charge switch pipe MC cuts off charge circuit.
The current detecting end VL of subordinate battery core protected location 1 is connected by the negative pole that detects the battery core unit V1 that resistance R sense is corresponding with subordinate battery core protected location 1.The size of the electric current that detects resistance is flow through in the voltage reflection of the current detecting end VL of battery core protected location 1, the detection of can charge overcurrent and electric discharge overcurrent.In order to make to discharge, overvoltage protection signal can be uploaded; can utilize detection of negative pressure end VM and current detecting end VL in battery core protected location to carry out signal transmission; in one embodiment; the current detecting end VL of the upper level battery core protected location that the detection of negative pressure end VM of the each battery core protected location except higher level's battery core protected location n is adjacent is connected, and the detection of negative pressure end VM of higher level's battery core protected location n is unsettled or connect predetermined level (such as the supply voltage VDD of corresponding battery core unit).
Whether extremely each battery core protected location 1,2,3 and n carry out discharge examination to obtain representing this corresponding battery core unit V1, V2, V3 and Vn current electric discharge overvoltage protection signal of (overvoltage of whether discharging) to corresponding battery core unit V1, V2, V3 and Vn.In addition, the whether abnormal higher level of expression that each battery core protected location except higher level's battery core protected location n also can receive the discharge prevention output output of its adjacent higher level's battery core protected location by its discharge prevention input IOD overvoltage protection signal that discharges, the higher level who receives the discharge prevention output output of its adjacent higher level's battery core protected location 2 by its discharge prevention input IOD such as the battery core protected location 1 overvoltage protection signal that discharges, whether this higher level overvoltage protection signal indication battery core protected location 2 that discharges enters electric discharge overvoltage protection state (overvoltage or no abnormal of whether discharging).The discharge prevention input IOD of higher level's battery core protected location n connects and represents normal charge protection signal, that is to say that this discharge prevention input IOD is inoperative to electric discharge overvoltage protection.In this article; represent that abnormal electric discharge overvoltage protection signal or electric discharge overvoltage protection signal, for extremely just meaning for this electric discharge overvoltage protection signal indication electric discharge overvoltage, represent that the electric discharge overvoltage protection signal of non-abnormal (normal) or electric discharge overvoltage protection signal are non-this electric discharge overvoltage protection signal indication absence of discharge overvoltage that extremely just representing.
In addition, each battery core protected location except subordinate battery core protected location 1 also receives the whether abnormal subordinate's electric discharge overvoltage protection signal of expression of the detection of negative pressure end VM output of its adjacent subordinate's battery core protected location by its current detecting end VL, such as battery core protected location 3 is understood subordinate's electric discharge overvoltage protection signal that receive the detection of negative pressure end VM output of its adjacent subordinate's battery core protected location 2 by its current detecting end VL, whether this subordinate's electric discharge overvoltage protection signal indication battery core protected location 1 enters electric discharge overvoltage protection state (overvoltage or no abnormal of whether discharging).As mentioned above, the current detecting end VL of subordinate battery core protected location 1 is connected by the negative pole that detects the battery core unit V1 that resistance R sense is corresponding with subordinate battery core protected location 1, to carry out current detecting.
Sum up; in intergrade battery core protected location (the battery core protected location except higher level's battery core protected location and subordinate battery core protected location), have current electric discharge overvoltage protection signal, higher level discharge overvoltage protection signal and subordinate's electric discharge overvoltage protection signal; in higher level's battery core protected location n, only have current electric discharge overvoltage protection signal and subordinate's electric discharge overvoltage protection signal, in the battery core protected location n of subordinate, only have current electric discharge overvoltage protection signal and the higher level overvoltage protection signal that discharges.Anyway, for each battery core protected location, it enters electric discharge overvoltage protection state when overvoltage protection signal is abnormal for abnormal or subordinate's electric discharge overvoltage protection signal for abnormal, higher level discharge at current electric discharge overvoltage protection signal.
Entering after electric discharge overvoltage condition; each battery core protected location except subordinate battery core protected location can generate and pass through its discharge prevention output DOUT output and represent the discharge prevention input of abnormal electric discharge overvoltage protection signal to subordinate's battery core protected location, and subordinate battery core protected location can generate and pass through its discharge prevention output DOUT output and represents the control end of abnormal electric discharge overvoltage protection signal to described discharge switch pipe MD.Entering after electric discharge overvoltage condition; each battery core protected location except higher level's battery core protected location can generate and pass through its detection of negative pressure end VM output and represent the current detecting end VL of abnormal electric discharge overvoltage protection signal to higher level's battery core protected location, and the detection of negative pressure end VM of higher level's battery core protected location will no longer upwards transmit electric discharge overvoltage signal.Described electric discharge overvoltage protection signal is upwards transmitted and/or going down after, this battery core protected location proceeds to low-power consumption mode, higher level's battery core protected location can upwards not transmit described electric discharge overvoltage protection signal and just enter low-power consumption mode.
In sum; the discharge prevention input IOD of each battery core protected location and discharge prevention output DOUT have built the biography path down of electric discharge overvoltage protection signal; realize the going down of electric discharge overvoltage protection signal; and the detection of negative pressure end VM of each battery core protected location and current detecting end VL have built the Pathways Mediating of electric discharge overvoltage protection signal, realize the upwards transmission of electric discharge overvoltage protection signal.Like this in the case of not increasing the pin of battery core protected location; enter after electric discharge overvoltage protection state at any one battery core protected location; can make every other battery core protected location can both enter electric discharge overvoltage protection state; further make all battery core protected locations all enter low-power consumption mode, reduced power consumption.
It should be noted that; higher level in the present invention is relative with the statement of subordinate; such as with respect to battery core protected location 2, battery core protected location 1 is exactly subordinate's battery core protected location of battery core protected location 2, and battery core protected location 3 is exactly higher level's battery core protected location of battery core protected location 2.With regard to two adjacent battery core protected locations; one of them is higher level's battery core protected location; another is subordinate's battery core protected location; such as the battery core protected location 1 and 2 take adjacent is example; battery core protected location 1 is just called as subordinate's battery core protected location, and battery core protected location 2 is just called as higher level's battery core protected location.The battery core protected location being connected with discharge switch pipe MD with charge switch pipe MC is called as subordinate battery core protected location.
In one embodiment; as shown in Figure 2, described battery protecting circuit 200 also includes and is arranged at uploading circuit 211,212,21n-1, be arranged at the signal sending circuit (not shown) in subordinate's battery core protected location and be arranged at the signal receiving circuit (not shown) in higher level's battery core protected location between two adjacent battery core protected locations.For adjacent battery core protected location, be introduced as an example of adjacent battery core protected location 1 and 2 example, in the time that subordinate's battery core protected location 1 enters electric discharge overvoltage protection state, the signal sending circuit of this subordinate's battery core protected location 1 draws high the level of described detection of negative pressure end VM to the maximum level VDD of its corresponding battery core unit 1, cause described transfer circuit 211 to be worked, so that the voltage of the current detecting end VL of this higher level's battery core protected location 2 is pulled low to the minimum voltage VSS lower than its corresponding battery core unit 2, the signal receiving circuit of this higher level's battery core protected location 2 is at the voltage of determining its current detecting end VL during lower than the minimum voltage VSS of its corresponding battery core unit 2, think the abnormal subordinate's electric discharge overvoltage protection signal of expression of the detection of negative pressure end VM output that receives its adjacent subordinate's battery core protected location 1.
Preferably, described in, upload circuit and comprise switching tube M1, M2, Mn-1, the first resistance R 11, R21, R (n-1) 1, the second resistance R 12, R22, R (n-1) 2.Described switching tube can be nmos pass transistor, and the drain electrode of described nmos pass transistor is as the first link of switching tube, and source electrode is as the second link, and grid is as the control end of switching tube.Still be introduced as an example of adjacent battery core protected location 1 and 2 example, the current detecting end VL of higher level's battery core protected location 2 is connected to the negative pole of its corresponding battery core unit 1 by described the first resistance R 11, the current detecting end of higher level's battery core protected location 2 is also connected to the first link of described switching tube M1 by resistance R 12, the second link of described switching tube M1 connects a node N1, the voltage of this node N1 is lower than the ceiling voltage VDD of the battery core unit 1 of subordinate's battery core protected location 1 correspondence, concrete, the difference of the voltage of the node N1 that the ceiling voltage of battery core unit 1 of subordinate's battery core protected location 1 correspondence and the second link of described switching tube M1 are connected exceedes the on state threshold voltage VTH of described nmos pass transistor.The control end of described switching tube M1 is connected to the detection of negative pressure end VM of subordinate's battery core protected location 1; in the time that the level of described detection of negative pressure end VM is drawn high the maximum level VDD to its corresponding battery core unit 1 by the signal sending circuit of subordinate's battery core protected location 1; described switching tube M1 conducting, causes the voltage of current detecting end VL of higher level's battery core protected location 2 lower than the minimum voltage VSS of the battery core unit 2 of higher level's battery core protected location 2 correspondences.
In specific embodiment; the signal receiving circuit of this higher level's battery core protected location can be a voltage comparator; it is the voltage of its current detecting end VL and the voltage of its second source end VSS relatively; voltage at the voltage of its current detecting end VL lower than its second source end VSS, thinks the abnormal subordinate's electric discharge overvoltage protection signal of expression of the detection of negative pressure end VM output that receives its adjacent subordinate's battery core protected location.The signal sending circuit of this subordinate's battery core protected location 1 can be that a voltage is drawn high circuit; enter after electric discharge overvoltage protection state at this subordinate's battery core protected location 1, this voltage is drawn high circuit the voltage of detection of negative pressure end VM is drawn high to the ceiling voltage of the battery core unit 1 of this subordinate's battery core protected location 1 correspondence.
In the embodiment of a change, described in can dispensing, upload the second resistance in circuit, can reach equally identical object.
In one embodiment, described discharge switch pipe MD is the first nmos pass transistor, described charge switch pipe is the second nmos pass transistor, the source electrode of the first nmos pass transistor is connected with the negative pole of battery core unit V1 through described detection resistance R sense, its drain electrode is connected with the drain electrode of the second nmos pass transistor, the source electrode of the second nmos pass transistor is connected with load resistance RL, and the lining body of the first nmos pass transistor M is connected with its source electrode, and the lining body of the second nmos pass transistor is connected with its source electrode.The detection of negative pressure end VM of subordinate battery core protected location 1 is also connected with the source electrode of described charge switch pipe MC by a malleation clamper tube MX, and the grid of described malleation clamper tube MX is connected with the positive pole of battery core unit V1.
In the present invention in the present invention, " connection ", be connected, word that the expression such as " company ", " connecing " is electrical connected, if no special instructions, represent direct or indirect electric connection." non-abnormal " also can be referred to as normal.
It is pointed out that and be familiar with the scope that any change that person skilled in art does the specific embodiment of the present invention does not all depart from claims of the present invention.Correspondingly, the scope of claim of the present invention is also not limited only to previous embodiment.
Claims (9)
1. a battery protecting circuit, for multiple battery core unit of series connection are successively protected, is characterized in that, it comprises multiple battery core protected locations,
Each battery core protected location is connected between the both positive and negative polarity of corresponding battery core unit,
Each battery core protected location comprises discharge prevention output, discharge prevention input, current detecting end and detection of negative pressure end; the discharge prevention output of higher level's battery core protected location that the discharge prevention input of the each battery core protected location except higher level's battery core protected location is adjacent is connected; the discharge prevention input of higher level's battery core protected location connects and represents normal electric discharge overvoltage protection signal; the current detecting end of higher level's battery core protected location that the detection of negative pressure end of the each battery core protected location except higher level's battery core protected location is adjacent is connected
Whether abnormal each battery core protected location carry out discharge examination to obtain representing current electric discharge overvoltage protection signal to corresponding battery core unit, the whether abnormal higher level of expression that each battery core protected location except higher level's battery core protected location also can receive the discharge prevention output output of its adjacent higher level's battery core protected location by its discharge prevention input overvoltage protection signal that discharges, each battery core protected location except subordinate battery core protected location is also received the whether abnormal subordinate's electric discharge overvoltage protection signal of expression of the detection of negative pressure end output of its adjacent subordinate's battery core protected location by its current detecting termination,
Each battery core protected location except higher level's battery core protected location and subordinate battery core protected location is abnormal at current electric discharge overvoltage protection signal, higher level discharges and when overvoltage protection signal is abnormal for abnormal or subordinate's electric discharge overvoltage protection signal, enters electric discharge overvoltage protection state, generate and pass through its discharge prevention output output and represent the discharge prevention input of abnormal electric discharge overvoltage protection signal to subordinate's battery core protected location, generate and pass through its detection of negative pressure end output and represent the current detecting end of abnormal electric discharge overvoltage protection signal to higher level's battery core protected location, proceed to subsequently low-power consumption mode.
2. battery protecting circuit according to claim 1, it is characterized in that, the discharge prevention output of subordinate battery core protected location is connected with the control end of discharge switch pipe, the current detecting end of subordinate battery core protected location is connected by the negative pole that detects the battery core unit that resistance is corresponding with subordinate battery core protected location, subordinate battery core protected location enters electric discharge overvoltage protection state when overvoltage protection signal is abnormal for abnormal or higher level discharge at current electric discharge overvoltage protection signal, generate and pass through its discharge prevention output output and represent that abnormal electric discharge overvoltage protection signal is to described discharge switch pipe, described discharge switch pipe cuts off discharge loop, generate simultaneously and pass through its detection of negative pressure end output and represent the current detecting end of abnormal electric discharge overvoltage protection signal to higher level's battery core protected location, subsequently, subordinate battery core protected location enters low-power consumption mode,
The detection of negative pressure end of higher level's battery core protected location is unsettled or connect predetermined level; higher level's battery core protected location enters electric discharge overvoltage protection state while being abnormal at current electric discharge overvoltage protection signal for abnormal or subordinate's electric discharge overvoltage protection signal; generate and pass through the discharge prevention input of the abnormal electric discharge overvoltage protection signal of its discharge prevention output output expression to subordinate's battery core protected location, proceeding to subsequently low-power consumption mode.
3. battery protecting circuit according to claim 2; it is characterized in that; it also comprises: be arranged at uploading circuit, be arranged at the signal sending circuit in subordinate's battery core protected location and be arranged at the signal receiving circuit in higher level's battery core protected location between two adjacent battery core protected locations
In the time that subordinate's battery core protected location enters electric discharge overvoltage protection state; the signal sending circuit of this subordinate's battery core protected location draws high the level of described detection of negative pressure end to the maximum level of its corresponding battery core unit; cause described transfer circuit work; so that the voltage of the electric current electrical measurement end of this higher level's battery core protected location is pulled low to the minimum voltage lower than its corresponding battery core unit
The signal receiving circuit of this higher level's battery core protected location during lower than the minimum voltage of its corresponding battery core unit, thinks that the detection of negative pressure end output that receives its adjacent subordinate's battery core protected location represents abnormal subordinate's electric discharge overvoltage protection signal at the voltage of determining its current detecting end.
4. battery protecting circuit according to claim 3, is characterized in that, described in upload circuit and comprise switching tube and the first resistance,
The current detecting end of higher level's battery core protected location is connected to the negative pole of its corresponding battery core unit by described the first resistance; the current detecting end of higher level's battery core protected location is also connected to the first link of described switching tube; the second link of described switching tube connects a node; the voltage of this node is lower than the ceiling voltage of battery core unit corresponding to subordinate's battery core protected location; the control end of described switching tube is connected to the detection of negative pressure end of subordinate's battery core protected location
In the time that the level of described detection of negative pressure end is drawn high the maximum level to its corresponding battery core unit by the signal sending circuit of subordinate's battery core protected location; described switching tube conducting, causes the voltage of current detecting end of higher level's battery core protected location lower than the minimum voltage of battery core unit corresponding to higher level's battery core protected location.
5. battery protecting circuit according to claim 4; it is characterized in that; described switching tube is nmos pass transistor; the drain electrode of described nmos pass transistor is as the first link of switching tube; source electrode is as the second link; grid is as the control end of switching tube, and the difference of the voltage of the node that the ceiling voltage of the battery core unit that subordinate's battery core protected location is corresponding is connected with the second link of described switching tube exceedes the on state threshold voltage of described nmos pass transistor.
6. battery protecting circuit according to claim 4, is characterized in that, described in upload circuit and comprise and also comprise the second resistance, the current detecting end of described higher level's battery core protected location is connected to the first link of described switching tube by the second resistance.
7. battery protecting circuit according to claim 1, is characterized in that, each battery core unit includes multiple battery cores of series connection successively.
8. battery protecting circuit according to claim 2, is characterized in that, each battery core protected location comprises charge protection output and charge protection input,
The charge protection output of the upper level battery core protected location that the charge protection input of the each battery core protected location except higher level's battery core protected location is adjacent is connected; the charge protection input of higher level's battery core protected location connects and represents normal charge protection signal; the charge protection output of subordinate battery core protected location is connected with the control end of charge protection switch, and charge switch pipe, discharge switch pipe are connected in successively load and detect between resistance.
9. a battery protection system, is characterized in that, it comprises battery pack, switch combination circuit and battery protecting circuit,
Described battery pack comprises multiple battery core unit of series connection successively, a link of higher level's battery core unit is connected with the first outside link, a link of subordinate's battery core unit successively by detecting resistance, described switch combination circuit is connected in the second outside link
Described switch combination circuit comprises charge switch pipe and the discharge switch pipe of series connection,
Described battery protecting circuit is the battery protecting circuit as described in as arbitrary in claim 1-8.
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| CN201410124389.0A CN103855689B (en) | 2014-03-28 | 2014-03-28 | Cascaded battery protection circuit and system |
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| CN103855689B CN103855689B (en) | 2017-01-25 |
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| CN116799766A (en) * | 2023-08-24 | 2023-09-22 | 禹创半导体(深圳)有限公司 | Protection circuit for detecting load during cascade application of battery protection chips |
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|---|---|
| CN103855689B (en) | 2017-01-25 |
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