CN203299255U - Voltage detection circuit formed by connecting a plurality of electric core units in series and battery protection system - Google Patents
Voltage detection circuit formed by connecting a plurality of electric core units in series and battery protection system Download PDFInfo
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- CN203299255U CN203299255U CN2013203004772U CN201320300477U CN203299255U CN 203299255 U CN203299255 U CN 203299255U CN 2013203004772 U CN2013203004772 U CN 2013203004772U CN 201320300477 U CN201320300477 U CN 201320300477U CN 203299255 U CN203299255 U CN 203299255U
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Abstract
The utility model provides a voltage detection circuit formed by connecting a plurality of electric core units in series and a battery protection system. The voltage detection circuit comprises a voltage detection module, a storage module and a logical judgment module. The voltage detection module periodically detects voltages of the electric core units one by one and compares the detected voltage of each electric core unit with a high voltage threshold and/or a low voltage threshold so as to output a voltage detection signal indicating whether abnormality exists; the storage module is used for storing all the voltage detection signals output by the voltage detection module and corresponding to the electric core units in the current detection period; and the logical judgment module is used for carrying out logical judgment according to the voltage detection signals stored by the storage module and corresponding to all the electric core units in the current detection period, and the logical judgment module outputs a protection signal if at least one of the voltage detection signals is an abnormal voltage detection signal. Compared with the prior art, the voltage detection circuit provided by the utility model can improve the matching attribute of a protection voltage threshold in a battery detection circuit.
Description
[technical field]
The utility model relates to a kind of electric power management circuit, particularly a kind of voltage detecting circuit of a plurality of battery core units in series and battery protection 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 the military and civilian compact electric apparatus, as mobile phone, portable computer, video camera, camera etc., Partial Replacement conventional batteries.But because of its physical characteristics, in use, lithium battery is very strict to charging current, discharge current, voltage and temperature requirement, in case surpass, will produce serious consequence on safety He on the life-span.Therefore, lithium ion battery in discharging and recharging the course of work, need to monitor and control key parameters such as its overcharge voltage, overdischarge voltage, charging Limited Current and discharge Limited Currents, to prevent the safety of battery excessive loss in guaranteeing simultaneously to use.
For the lithium battery (perhaps battery core unit) of multi-section serial group, need to detect the voltage status of each battery core unit with the battery protecting circuit of its coupling, charging overvoltage condition or discharge under-voltage condition appear to have determined whether the battery core unit.
Please refer to shown in Figure 1ly, it is the schematic diagram of the battery protection system of more piece battery core units in series of the prior art.Described battery protection system comprises electric battery 110, voltage detecting circuit 120, control circuit 130 and switch combination circuit 140.
Described electric battery 110 comprises a plurality of battery core unit B 1, B2, Bn-1 and the Bn of series connection successively, the positive pole of higher level's battery core unit B n is connected with anode link P+, and the negative pole of subordinate battery core unit B 1 is connected in battery cathode link P-by described switch combination circuit 140.
Described voltage detecting circuit 120 comprises voltage detection module 122 and comparison module 124.Described voltage detection module 122 comprises a plurality of voltage detection units, be respectively voltage detection unit 1, voltage detection unit 2 ..., voltage detection unit n-1 and voltage detection unit n, wherein, the corresponding battery core unit of each voltage detection unit is to detect the voltage of corresponding battery core unit.(be that charger just is being connected between described anode link P+ and battery cathode link P-when described battery protection system is in charged state; to electric battery 110 chargings) time; described comparison module 124 compares voltage and the predefined high voltage protective threshold value of the n economize on electricity core unit that each voltage detection unit detects, and to judge described electric battery 110, whether is in the charging overvoltage condition.Be specially, when described battery protection system is in charged state, if the voltage of all battery core unit that detect during all less than described high voltage protective threshold value described comparison module 124 outputs charge normal voltage signal; When if the voltage of at least one battery core unit is pressed threshold value greater than described high voltage protective, described comparison module 124 output abnormality charging signals (being the charging overvoltage protection signal).(be that load is connected between described anode link P+ and battery cathode link P-when described battery protection system is in discharge condition; 110 pairs of load supplyings of electric battery) time; described comparison module 124 compares voltage and the predefined low-voltage variation threshold value of the n economize on electricity core unit that each voltage detection unit detects, and to judge described electric battery 110, whether is in the discharge under-voltage condition.Be specially, when described battery protection system is in discharge condition, if the voltage of all battery core unit that detect all greater than described under-voltage protection threshold value, described comparison module 124 output regular picture voltage signals; If the voltage of at least one battery core unit is less than described under-voltage protection threshold value, described comparison module 124 output abnormality sparking voltage signals (the under-voltage protection signal namely discharges).
Described switch combination circuit 140 comprises nmos pass transistor MN1 and MN2, the source electrode of described nmos pass transistor MN1 is connected with the negative pole of battery core unit B 1, the drain electrode of described nmos pass transistor MN1 is connected with the drain electrode of nmos pass transistor MN2, the source electrode of described nmos pass transistor MN2 is connected with described battery cathode link P-, the grid of described nmos pass transistor MN1 is control of discharge end DO, and the grid of described nmos pass transistor MN2 is charging control end CO.
Described control circuit 130 is given described control of discharge end DO according to the signal output discharge control signal of described comparison module 124 outputs, and the output charging control signal is given described charging control end CO.When described comparison module 124 output abnormality charging signals, described control circuit 130 is controlled nmos pass transistor MN2 cut-off and nmos pass transistor MN1 conducting, namely turn-offs charge circuit; When described comparison module 124 output abnormality discharge signal, described control circuit 130 is controlled nmos pass transistor MN2 conducting and nmos pass transistor MN1 cut-off, namely turn-offs discharge loop.
Due to the corresponding voltage detection unit independently in each the battery core unit in Fig. 1; a plurality of voltage detecting deviation (offset) separately can cause each battery core protection voltage threshold (such as; HVT high voltage threshold and low pressure threshold) the matching reduction, it is large that discreteness becomes.In addition, need a plurality of voltage detection units in Fig. 1, the device that needs is also more, and area occupied is larger.
Therefore, be necessary to provide a kind of improved technical scheme to overcome the problems referred to above.
[utility model content]
The purpose of this utility model is to provide a kind of voltage detecting circuit and battery protection system of a plurality of battery core units in series; not only can the voltage of a plurality of battery cores unit be detected; to have determined whether that the battery core unit is in charging overvoltage condition or discharge under-voltage condition, but also can improve the matching of the protection voltage threshold in this battery detection circuit.
In order to address the above problem, according to an aspect of the present utility model, the utility model provides a kind of voltage detecting circuit, be used for a plurality of battery core unit of series connection are successively carried out voltage detecting, it is characterized in that, it comprises voltage detection module, memory module and logic decision module, described voltage detection module detects the voltage of each battery core unit periodically one by one, and the voltage of each battery core unit that will detect and HVT high voltage threshold and/or low pressure threshold compare, with output abnormal voltage detection signal whether; Described memory module is used for the storage current detection in the cycle, the voltage detection signal corresponding to each battery core unit of described voltage detection module output; Described logic decision module is carried out logic decision according to all battery core unit of described memory module storage at voltage detection signal corresponding to current detection cycle; when if at least one voltage detection signal is the abnormal voltage detection signal, described logic decision module output protection signal.
Further, when charging, described voltage detection module detects the voltage of each battery core unit one by one in a sense cycle, and voltage and the HVT high voltage threshold of each battery core unit that will detect compare, with output abnormal charging voltage detection signal whether; Described memory module is stored current detection in the cycle, the charging voltage detection signal corresponding to each battery core unit of described voltage detection module output; Described logic decision module is carried out logic decision according to all battery core unit of described memory module storage at charging voltage detection signal corresponding to current detection cycle, when if at least one charging voltage detection signal is abnormal charging voltage detection signal, described logic decision module output charging overvoltage protection signal, when discharge, described voltage detection module detects the voltage of each battery core unit one by one in a sense cycle, and voltage and the low pressure threshold of each battery core unit that will detect compare, with output abnormal sparking voltage detection signal whether; Described memory module is stored current detection in the cycle, the sparking voltage detection signal corresponding to each battery core unit of described voltage detection module output; Described logic decision module is carried out logic decision according to all battery core unit of described memory module storage at sparking voltage detection signal corresponding to current detection cycle; when if at least one sparking voltage detection signal is the paradoxical discharge voltage detection signal, described logic decision module output discharge under-voltage protection signal.
Further, each battery core unit is to there being a clock signal, and the cycle of the clock signal that each battery core unit is corresponding is identical with described sense cycle, in a sense cycle, the significant level of the clock signal that each battery core unit is corresponding is not overlapping mutually, described voltage detecting circuit also comprises control module, when a clock signal corresponding to battery core unit is significant level, described control module is connected to this battery core unit with described voltage detection module, and described voltage detection module is detected this battery core unit; When a clock signal corresponding to battery core unit was inactive level, described control module was not connected described voltage detection module with this battery core unit.
further, described control module comprises many to switch, the corresponding pair of switches in each battery core unit, every pair of switch comprises the first switch and second switch, the first switch of often splitting the Central Shanxi Plain is connected between the first link with this positive pole to battery core unit corresponding to switch and voltage detection unit, the second switch of often splitting the Central Shanxi Plain is connected between the second link with this negative pole to battery core unit corresponding to switch and voltage detection unit, and the control end of every pair of switch all is connected to clock signal corresponding to battery core unit corresponding to switch with this, when a clock signal corresponding to battery core unit is significant level, the pair of switches all conducting corresponding with this battery core unit, when a clock signal corresponding to battery core unit was inactive level, the pair of switches corresponding with this battery core unit all turn-offed.
Further, described voltage detection module comprises voltage/current modular converter, current comparing module and reference current module, and described voltage/current modular converter is electric current with the voltage transitions of described battery core unit; Described reference current module is used for generating the first reference current of corresponding HVT high voltage threshold and/or the second reference current of corresponding low pressure threshold; Whether abnormal described current comparing module is used for the first reference current of the corresponding HVT high voltage threshold that the switching current of described voltage/current modular converter output and described reference current module are generated and/or the second reference current of corresponding low pressure threshold compares, to export voltage detection signal.
Further, when charging, described reference current module generates the first reference current of corresponding HVT high voltage threshold; Described voltage/current modular converter carries out current conversion with the voltage of each battery core unit one by one in a sense cycle, and the switching current that the voltage of each battery core unit is corresponding and described the first reference current compare, with output abnormal charging voltage detection signal whether; When discharge, described reference current module generates the second reference current of corresponding low pressure threshold; Described voltage/current modular converter carries out current conversion with the voltage of each battery core unit one by one in a sense cycle, and the switching current that the voltage of each battery core unit is corresponding and described the second reference current compare, with output abnormal sparking voltage detection signal whether.
Further, described memory module comprises a plurality of storage unit, the corresponding storage unit in each battery core unit, the clock signal that the battery core unit that the clock end of each storage unit is corresponding with it is corresponding is connected, the input end of each storage unit is connected with the output terminal of described current comparing module, its output terminal is connected with described logic decision module, when the significant level of the clock signal of receiving when the clock termination of a storage unit finished, it latched the voltage detection signal of the output terminal of the described current comparing module that its input end receives.
Further, except the first link and the second link, described voltage/current modular converter also comprises output terminal, the first resistance R C, the second resistance R A, the 3rd resistance R B, the first operational amplifier OA1 and a PMOS transistor MP1, and the second resistance R A and the 3rd resistance R B are series between described the first link and the second link successively; The first resistance R C and a PMOS strings of transistors are coupled between the first link and output terminal; The normal phase input end of described operational amplifier is connected with the connected node between the second resistance R A and the 3rd resistance R B, its negative-phase input is connected with the connected node between a described PMOS transistor and the first resistance R C, and its output terminal is connected with a described transistorized grid of PMOS.
Further, described reference current module comprises bandgap voltage reference, the second operational amplifier, the 3rd nmos pass transistor, the 2nd PMOS transistor, the 3rd PMOS transistor and resistance R 0, and the source electrode of described the 2nd PMOS transistor and the 3rd PMOS crystal is connected with power end; Described the 2nd transistorized grid of PMOS is connected with the grid of the 3rd PMOS crystal; Described the 2nd transistorized grid of PMOS is connected with its drain electrode; Described the 3rd nmos pass transistor and resistance R 0 be series at the 2nd transistorized drain electrode of PMOS and systematically between, the drain electrode of described the 3rd PMOS transistor MP3 is the output terminal of described reference current module; The normal phase input end of described the second operational amplifier is connected with described bandgap voltage reference, its negative-phase input is connected with the connected node between the 3rd nmos pass transistor and variable resistor, its output terminal is connected with the grid of the 3rd nmos pass transistor, and the electric current of the drain electrode output of described PMOS transistor MP3 is the reference current that described reference current module produces.
According on the other hand of the present utility model, the utility model provides a kind of battery protection system, and it comprises electric battery, switch combination circuit, control circuit and voltage detecting circuit.Described electric battery comprises a plurality of battery core unit of series connection successively, and a link of higher level's battery core unit is connected with the anode link, and a link of subordinate's battery core unit is connected in the battery cathode link by described switch combination circuit.Described switch combination circuit comprises charging control switch and the discharge control switch of series connection.Described voltage detecting circuit is used for a plurality of battery core unit of series connection are successively carried out voltage detecting, it comprises voltage detection module, memory module and logic decision module, described voltage detection module detects the voltage of each battery core unit periodically one by one, and the voltage of each battery core unit that will detect and HVT high voltage threshold and/or low pressure threshold compare, with output abnormal voltage detection signal whether; Described memory module is used for the storage current detection in the cycle, the voltage detection signal corresponding to each battery core unit of described voltage detection module output; Described logic decision module is carried out logic decision according to all battery core unit of described memory module storage at voltage detection signal corresponding to current detection cycle; when if at least one voltage detection signal is the abnormal voltage detection signal, described logic decision module output protection signal.Described control circuit controls described charging control switch according to the guard signal of described voltage detecting circuit output or discharge control switch ends to carry out the charge or discharge protection.
Compared with prior art; voltage detecting circuit and the battery protection system of a plurality of battery core units in series in the utility model; periodically one by one each battery core unit is carried out voltage detecting; not only can realize the voltage of a plurality of battery cores unit is detected; to have determined whether that the battery core unit is in charging overvoltage condition or discharge under-voltage condition, but also can improve the matching of the protection voltage threshold in this battery detection circuit.
[description of drawings]
In order to be illustrated more clearly in the technical scheme of the utility model embodiment, in below describing embodiment, the accompanying drawing of required use is briefly described, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.Wherein:
Fig. 1 is the schematic diagram of the battery protection system of more piece battery core units in series of the prior art;
Fig. 2 is the battery protection system circuit diagram in one embodiment in the utility model;
Fig. 3 is the voltage detecting circuit schematic diagram in one embodiment in Fig. 2; With
Fig. 4 is the oscillogram of each clock signal in Fig. 3.
[embodiment]
, for above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Alleged " embodiment " or " embodiment " refer to be contained in special characteristic, structure or the characteristic at least one implementation of the utility model 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, herein connection, the word that the expression that is connected, joins is electrically connected all represents directly or indirectly to be electrical connected.N herein is the natural number greater than 2, more than two of a plurality of expressions or two, the connection in literary composition, join, the word such as series connection can be understood as indirectly or directly and connects and join, connect.
Voltage detecting circuit and the battery protection system of a plurality of battery core units in series that the utility model provides; can carry out voltage detecting to each battery core unit periodically one by one; not only can realize the voltage of a plurality of battery cores unit is detected; to have determined whether that the battery core unit is in charging overvoltage condition or discharge under-voltage condition, but also can improve the matching of the protection voltage threshold in this battery detection circuit.
Please refer to shown in Figure 2ly, it is the battery protection system circuit diagram in one embodiment in the utility model.This battery protection system comprises electric battery 210, switch combination circuit 220, control circuit 230 and voltage detecting circuit 240.
Described electric battery 210 comprise a plurality of series connection successively battery core unit B 1, B2 ... Bn-1 and Bn, the positive pole of higher level's battery core unit B n is connected with anode link P+, and the negative pole of subordinate battery core unit B 1 is connected in battery cathode link P-by described switch combination circuit 220.
Described voltage detecting circuit 240 comprises voltage detection module 242, memory module 244 and logic decision module 246.Whether abnormal described voltage detection module 242 periodically detects the voltage of each battery core unit one by one, and the voltage of each battery core unit that will detect compares with HVT high voltage threshold and/or low pressure threshold, to export voltage detection signal.Described memory module 244 is used for the storage current detection in the cycle, the voltage detection signal corresponding to each battery core unit of described voltage detection module 242 outputs.Described logic decision module 246 is carried out logic decision according to all battery core unit of described memory module 244 storages at voltage detection signal corresponding to current detection cycle; when if at least one voltage detection signal is the abnormal voltage detection signal, described logic decision module 246 output protection signals.An embodiment of voltage detecting circuit 240 will be described in Fig. 3.
Below specifically introduce the course of work of described voltage detecting circuit 240.
(be that charger just is being connected between described anode link P+ and battery cathode link P-when described battery protection system is in charged state; to electric battery 210 chargings) time; described voltage detection module 242 detects the voltage of each battery core unit one by one in a sense cycle; and voltage and the HVT high voltage threshold of each battery core unit that will detect compare, with output abnormal charging voltage detection signal whether.Be specially, the voltage that a battery core unit detected when described voltage detection module 242 is during less than described HVT high voltage threshold, and described voltage detection module 242 outputs charge normal voltage detection signal, represent that this battery core unit charging voltage is normal; The voltage that a battery core unit detected when described voltage detection module 242 is during greater than described HVT high voltage threshold, and described voltage detection module 242 output abnormality charging voltage detection signals, represent this battery core unit charging overvoltage.The charging voltage detection signal corresponding to each battery core unit of described memory module described voltage detection module 242 outputs in 244 storage current detection cycles.Described logic decision module 246 is carried out logic decision according to all battery core unit of described memory module 244 storages at charging voltage detection signal corresponding to current detection cycle; when if at least one charging voltage detection signal is abnormal charging voltage detection signal; described logic decision module 246 output charging overvoltage protection signals, i.e. expression need to be carried out charge protection to electric battery 210.
(be that load is connected between described anode link P+ and battery cathode link P-when described battery protection system is in discharge condition; 210 pairs of load supplyings of electric battery) time; described voltage detection module 242 detects the voltage of each battery core unit one by one in a sense cycle; and voltage and the low pressure threshold of each battery core unit that will detect compare, with output abnormal sparking voltage detection signal whether.When realizing, the voltage that a battery core unit detected when described voltage detection module 242 is during greater than described low pressure threshold, and described voltage detection module 242 output regular picture voltage detection signals, represent that this battery core cell discharge voltage is normal; The voltage that a battery core unit detected when described voltage detection module 242 is during less than described low pressure threshold, and described voltage detection module 242 output abnormality sparking voltage detection signals, represent that this battery core cell discharge is under-voltage.Described memory module 244 is stored current detection in the cycle, the sparking voltage detection signal corresponding to each battery core unit of described voltage detection module 242 outputs.Described logic decision module 246 is carried out logic decision according to all battery core unit of described memory module 244 storages at sparking voltage detection signal corresponding to current detection cycle; when if at least one sparking voltage detection signal is the paradoxical discharge voltage detection signal; described logic decision module 246 output discharge under-voltage protection signals, i.e. expression need to be carried out discharge prevention to electric battery 210.
Please continue with reference to shown in Figure 2, described switch combination circuit 220 comprises the first nmos pass transistor MN1 and the second nmos pass transistor MN2, the source electrode of the first nmos pass transistor MN1 is connected with the negative pole of battery core unit B 1, its drain electrode is connected with the drain electrode of nmos pass transistor MN2, the source electrode of nmos pass transistor MN2 is connected with battery cathode link P-, the lining body of the first nmos pass transistor MN1 is connected with its source electrode, and the lining body of the second nmos pass transistor MN1 is connected with its source electrode.The grid of the first nmos pass transistor MN1 is the discharge prevention control end of described switch combination circuit 220, and the grid of the second nmos pass transistor MN2 is the charge protection control end of described switch combination circuit 220.Nmos pass transistor MN1 can be according to control conducting or the cut-off of the signal of its control end, thereby come conducting or cut-off discharge loop, therefore, described nmos pass transistor MN1 also can be called as discharge control switch, nmos pass transistor MN2 can be according to control conducting or the cut-off of the signal of its control end, thereby come conducting or cut-off charge circuit, therefore, described nmos pass transistor MN2 also can be called as charging control switch.
Described control circuit 230 is connected between the control end of the output terminal (output terminal of the module of logic decision namely 246) of described voltage detecting circuit 240 and described switch combination circuit 220, and its guard signal according to described voltage detecting circuit 240 outputs is controlled described switch combination circuit 220 and turn-offed charge circuit or discharge loops.Be specially, when described logic decision module 246 output charging overvoltage protection signal, described control circuit 230 is controlled nmos pass transistor MN2 cut-off and nmos pass transistor MN1 conducting, thereby turn-offs charge circuit; When described logic decision module 246 output discharge overvoltage protection signal, described control circuit 230 is controlled nmos pass transistor MN2 conducting and nmos pass transistor MN1 cut-off, thereby turn-offs discharge loop.
In sum, because the voltage detecting circuit 240 in the utility model only comprises a voltage detection module 242, described voltage detection module 242 periodically detects the voltage of each battery core unit one by one, and the voltage of each battery core unit that will detect and HVT high voltage threshold and/or low pressure threshold compare, with output abnormal voltage detection signal whether.Like this; not only can realize each battery core unit is carried out voltage detecting; to have determined whether that charging overvoltage or discharge under-voltage condition appear in the battery core unit; thereby take corresponding safeguard measure; and because the voltage that all uses same voltage detecting circuit 240 to each battery core unit detects; eliminated the deviation that a plurality of voltage detection units bring, can improve protection voltage threshold in battery detection circuit 240 (such as, described HVT high voltage threshold and described low pressure threshold) matching.
Please refer to shown in Figure 3ly, it is the voltage detecting circuit schematic diagram in one embodiment in Fig. 2.Described voltage detecting circuit 340 comprises voltage detection module 342, memory module 344, logic decision module 346 and control module 348.
In embodiment shown in Figure 3, each battery core unit is to there being a control signal (or to claim clock signal, such as φ 1, φ 2, φ 3, and φ 4), and the cycle of control signal corresponding to each battery core unit is identical with described sense cycle, in a sense cycle, the significant level of the control signal that each battery core unit is corresponding is not overlapping mutually.When a control signal corresponding to battery core unit was significant level, described control module 348 was connected to this battery core unit with described voltage detection module 342, and 342 pairs of these battery core unit of described voltage detection module are detected; When a clock signal corresponding to battery core unit was inactive level, described control module was not connected described voltage detection module with this battery core unit.
For convenience of description, the electric battery 310 in Fig. 3 is exemplary four the battery core unit of series connection successively that drawn only, are respectively battery core unit B 1, battery core unit B 2, battery core unit B 3 and battery core unit B 4.Battery core unit B 1 correspondence has clock signal psi 1, battery core unit B 2 correspondences to have clock signal psi 2, battery core unit B 3 correspondences to have clock signal psi 3 and battery core unit B 4 correspondences that clock signal psi 4 is arranged.Please refer to shown in Figure 4ly, it is the oscillogram of each clock signal in Fig. 3, and in this figure, clock signal φ 1, φ 2, and the significant level of φ 3 and φ 4 is high level, and invalid signals is low level, and clock signal φ 1, φ 2, and the high level of φ 3 and φ 4 is not overlapping mutually, and sense cycle is T.In Fig. 4, the rising edge of the corresponding rear clock signal of the negative edge of previous clock signal, rising edge such as the corresponding φ 2 of the negative edge of φ 1, in other embodiments, the negative edge of previous clock signal also can be apart from the one end time of rising edge of a rear clock signal, accordingly, the negative edge of last clock signal in current detection cycle also can be apart from rising edge a period of time of first clock signal of next sense cycle, as long as guarantee that useful signal is not overlapping mutually.
In order to realize the above-mentioned functions of described control module 348.Control module 348 shown in Figure 3 comprises many to switch, the corresponding pair of switches in each battery core unit, and every pair of switch all comprises the first switch and second switch.Wherein, the first switch of often splitting the Central Shanxi Plain is connected between the first link 1 with this positive pole to battery core unit corresponding to switch and voltage detection unit 342, second switch is connected between the second link 2 with this negative pole to battery core unit corresponding to gauge tap and voltage detection unit 342, and the control end of every pair of gauge tap all is connected to clock signal corresponding to battery core unit corresponding to gauge tap with this.In a sense cycle, when a control signal corresponding to battery core unit is significant level, the pair of control switch all conducting corresponding with this battery core unit, thereby described voltage detection module 342 is connected to this battery core unit, and whether the voltage that makes described voltage detection module 342 detect this battery core unit is abnormal; When a control signal corresponding to battery core unit was inactive level, the pair of control switch corresponding with this battery core unit all turn-offed, thereby cut off being connected of described voltage detection module 342 and this battery core unit.For example, the corresponding clock signal φ 1 of battery core unit B 1, the pair of control switch corresponding with battery core unit B 1 is respectively the first K switch 1 and second switch K2, wherein, the first K switch 1 is connected between the first link 1 of the positive pole of battery core unit B 1 and voltage detection unit 342, second switch K2 is connected between the second link 2 of the negative pole of battery core unit B 2 and voltage detection unit 342, and the control end of the first K switch 1 and second switch K2 all is connected with clock signal φ 1.In a sense cycle, when clock signal psi 1 is significant level, the first K switch 1 and all conductings of second switch K2, thus described voltage detection module 342 is connected to this battery core unit; When a clock signal psi 1 was inactive level, the first K switch 1 and second switch K2 turn-offed, thereby cut off being connected of described voltage detection module 342 and battery core unit B 1.Due in a sense cycle, the significant level of the control signal that each battery core unit is corresponding is not overlapping mutually, and therefore, described voltage detection module 342 is carried out voltage detecting to each battery core unit one by one in a sense cycle.
Described voltage detection module 342 is the voltage detection module based on electric current, and it comprises voltage/current modular converter 3422, current comparing module ICOMP and reference current module 3424.
Described voltage/current modular converter 3422 is electric current with the voltage transitions of coupled battery core unit.
Described voltage/current modular converter 3422 comprises its first link 1 as described voltage detection module 342 of first input end 1(), its second link 2 as described voltage detection module 342 of the second input end 2(), output terminal 3, voltage sample unit, the first resistance R C, the first operational amplifier OA1 and a PMOS transistor MP1.Described voltage sample unit is used for sampling voltage between described first input end 1 and the second input end 2, and output sampled voltage, it comprises the second resistance R A and the 3rd resistance R B that is connected between described first input end 1 and the second input end 2, and the voltage of the node between the second resistance R A and the 3rd resistance R B is the sampled voltage of its output.The first resistance R C and a PMOS transistor MP1 are series between first input end 1 and output terminal 3; The normal phase input end of described operational amplifier OA1 is connected with the connected node (being the output terminal of described voltage sample unit) between the second resistance R A and the 3rd resistance R B, its negative-phase input is connected with the connected node between a described PMOS transistor MP1 and the first resistance R C, and its output terminal is connected with the grid of a described PMOS transistor MP1.When described voltage/current modular converter 3422 was connected with a battery core unit, it was electric current (electric current of the voltage of expression battery core unit) with the voltage transitions of this battery core unit.For example, (positive pole that is battery core unit B 1 is connected with the second input end 2 with the first input end 1 of described voltage/current modular converter 220 respectively with negative pole, and voltage/current modular converter 3422 is electric current with the positive pole of described battery core unit B 1 and the voltage transitions between negative pole when described control module 348 is connected described voltage/current modular converter 3422 with battery core unit B 1.concrete transfer process is, normal phase input end described battery core unit B 1 positive pole of sampling of described operational amplifier OA1 and the voltage (this sampled voltage equals B1*RA/ (RA+RB)) between negative pole, its output terminal feeds back to its negative-phase input through described PMOS transistor MP1, until the voltage of the normal phase input end of described the first operational amplifier OA1 and its negative-phase input equates, suppose that described the first operational amplifier OA1 is ideal operational amplificr, the current value of the drain electrode output of the one PMOS transistor MP1 (being the electric current of described voltage/current modular converter 3422 outputs) is approximately equal to the resistance of the sampled voltage of described the first operational amplifier OA1 normal phase input end divided by the first resistance R C, the electric current that is described voltage/current modular converter 3422 outputs equals B1*RA/ ((RA+RB) .RC), wherein, B1 is the voltage difference (being the magnitude of voltage of battery core unit B 1) of battery core unit B 1 both positive and negative polarity, RA, RB and RC are respectively the resistance value of resistance R A, RB and RC.Because resistance R A, RB and RC are constant in specific embodiment, therefore, the electric current of described voltage/current modular converter 3422 outputs is directly proportional with the voltage of the battery core unit of its detection (perhaps being connected), and namely described voltage/current modular converter 3422 is electric current with the voltage transitions of coupled battery core unit.
In summary, described voltage/current modular converter 3422 is in fact at first the voltage of coupled battery core unit to be sampled, then this sampled voltage is converted to electric current.Due to described sampled voltage less than the voltage of the battery core unit that is connected with described voltage/current modular converter 3422 (such as, when described voltage/current modular converter 3422 is connected with battery core unit B 1, sampled voltage equals the magnitude of voltage * RA/ (RA+RB) of battery core unit B 1), therefore, for the source electrode of PMOS transistor MP1 has left voltage margin to a series of circuit systematically, this voltage margin can be adjusted on a large scale by the ratio of regulating the second resistance R A and the 3rd resistance R B.
Described reference current module 3424 is used for generating the first reference current of corresponding HVT high voltage threshold and/or the second reference current of corresponding low pressure threshold.In the present embodiment, described reference current module 3424 comprises bandgap voltage reference Bandgap, the second operational amplifier OA2, the 3rd nmos pass transistor MN3, the 2nd PMOS transistor MP2, the 3rd PMOS transistor MP3, nonvolatile memory NVM and variable resistor R0.Store the effective resistance data of described variable resistor R0 in described nonvolatile memory NVM, can adjust the effective resistance value of described variable resistor R0 according to described effective resistance data.Certainly, in other embodiments, described resistance R 0 can be also the resistance of fixed resistance value.The source electrode of described PMOS transistor MP2 and MP3 is connected with power end VCC; The grid of described PMOS transistor MP2 and the grid of MP3 are connected; The grid of described PMOS transistor MP2 is connected with its drain electrode; Described nmos pass transistor MN3 and variable resistor R0 be series at the drain electrode of PMOS transistor MP2 and systematically between, the drain electrode of described PMOS transistor MP3 is the output terminal of described reference current module 3424.Described bandgap voltage reference Bandgap provides metastable Voltage Reference, and the application regulation technology is obtained the corresponding and high standard parasexuality of low temperature.The normal phase input end of described the second operational amplifier OA2 is connected with described bandgap voltage reference Bandgap, its negative-phase input is connected with the connected node between nmos pass transistor MN3 and variable resistor R0, its output terminal is connected with the grid of nmos pass transistor MN3, and the electric current of the drain electrode output of described PMOS transistor MP3 is the reference current that described reference current module 3424 produces.
Due to described the second operational amplifier OA2 and nmos pass transistor MN3 formation deep negative feedback, therefore, the voltage of nmos pass transistor MN3 drain electrode equals bandgap voltage reference Bandgap, can be similar to and think the no current second operational amplifier OA2 that flows through, nmos pass transistor MN3 generates electric current I 1, this electric current is approximately equal to the resistance of bandgap voltage reference Bandgap divided by variable resistor R0, therefore, can regulate electric current I 1 by regulating variable resistor R0.Again because the source electrode of PMOS transistor MP2 and MP3 is connected, grid also is connected, be that PMOS transistor MP3 and MP2 form current mirror, therefore, the electric current of the drain electrode of PMOS transistor MP3 generation (being the reference current that described reference current module 3424 produces) equates with described electric current I 1 or is proportional.Like this, described reference current module 340 just can generate the first reference current of stable corresponding HVT high voltage threshold and/or the second reference current of corresponding low pressure threshold.
Whether abnormal described current comparing module ICOMP is used for that the switching current of described voltage/current modular converter 220 outputs is used for the first reference current of the corresponding HVT high voltage threshold that generates with described reference current module 3424 and/or the second reference current of corresponding low pressure threshold compares, to export voltage detection signal.
, below with reference to Fig. 3 and Fig. 2, specifically introduce the principle of work of described voltage detection module 342.
(be that charger just is being connected between described anode link P+ and battery cathode link P-when described battery protection system is in charged state; to electric battery 210 chargings) time, described reference current module 3424 generates the first reference current of corresponding HVT high voltage threshold.Described voltage/current modular converter 3422 carries out current conversion with the voltage of each battery core unit one by one in a sense cycle, and the switching current that the voltage of each battery core unit is corresponding and described the first reference current compare, with output abnormal charging voltage detection signal whether.Be specially, when switching current corresponding to the voltage of a battery core unit of described voltage/current modular converter 3422 outputs during less than described the first reference current, namely represent the voltage of this battery core unit less than HVT high voltage threshold, described current comparing module ICOMP output charges normal voltage detection signal; When switching current corresponding to the voltage of a battery core unit of described voltage/current modular converter 3422 outputs during greater than described the first reference current, represent that namely the voltage of this battery core unit is greater than HVT high voltage threshold, described current comparing module ICOMP output abnormality charging voltage detection signal, represent this battery core unit charging overvoltage.
(be that load is connected between described anode link P+ and battery cathode link P-when described battery protection system is in discharge condition; 210 pairs of load supplyings of electric battery) time, described reference current module 3424 generates the second reference current of corresponding low pressure threshold.Described voltage/current modular converter 3422 carries out current conversion with the voltage of each battery core unit one by one in a sense cycle, and the switching current that the voltage of each battery core unit is corresponding and described the second reference current compare, with output abnormal sparking voltage detection signal whether.Be specially, when switching current corresponding to the voltage of a battery core unit of described voltage/current modular converter 3422 outputs during greater than described the second reference current, namely represent the voltage of this battery core unit greater than low pressure threshold, described current comparing module ICOMP output regular picture voltage detection signal; When switching current corresponding to the voltage of a battery core unit of described voltage/current modular converter 3422 outputs during less than described the second reference current, represent that namely the voltage of this battery core unit is less than low pressure threshold, described current comparing module ICOMP output abnormality sparking voltage detection signal, represent that this battery core cell discharge is under-voltage.
244 function of the memory module in the memory module 344 in Fig. 3 and Fig. 2 is identical, namely is used for the storage current detection in the cycle, the voltage detection signal corresponding to each battery core unit of described voltage detection module 342 outputs.Described memory module 344 comprises a plurality of d type flip flops, the corresponding d type flip flop in each battery core unit, the control signal that the battery core unit that the clock end CK of each d type flip flop is corresponding with it is corresponding is connected, the input end D of each d type flip flop is connected with the output terminal of described current comparing module ICOMP, and its output terminal Q is connected with described logic decision module 346.When the significant level of the clock signal that receives as the clock end CK of a d type flip flop finished, it latched the voltage detection signal of the output terminal of the described current comparing module ICOMP that (perhaps upgrading) its input end D receives.Memory module 344 in Fig. 3 comprises four d type flip flops, be respectively d type flip flop DFF1, DFF2, DFF3 and DFF4, wherein, the corresponding battery core unit B 1 of d type flip flop DFF1, its clock end CK is connected with clock signal φ 1, the corresponding battery core unit B 2 of d type flip flop DFF2, its clock end CK is connected with clock signal φ 2, the corresponding battery core unit B 3 of d type flip flop DFF3, and its clock end CK is connected with clock signal φ 3, the corresponding battery core unit B 4 of d type flip flop DFF4, its clock end CK is connected with clock signal φ 4.
In a sense cycle, when clock signal psi 1 is significant level, described voltage detection module 342 is connected with battery core unit B 1, battery core unit B 1 is carried out voltage detecting and voltage sense signal, when clock signal psi 1 is inactive level by the significant level saltus step, d type flip flop DFF1 latchs the voltage detection signal of the output terminal of the described current comparing module ICOMP that its input end D receives, controls simultaneously described voltage detection module 342 and is not connected with battery core unit B 1; When clock signal Q2 is significant level, described voltage detection module 342 is connected with battery core unit B 2, battery core unit B 2 is carried out voltage detecting and voltage sense signal, when clock signal Q2 is inactive level by the significant level saltus step, d type flip flop DFF2 latchs the voltage detection signal of the output terminal of the described current comparing module ICOMP that its input end D receives, controls simultaneously described voltage detection module 342 and is not connected with battery core unit B 2.Like this, each d type flip flop DFF upgrades the voltage detection signal of its storage automatically by the clock signal of correspondence, and guarantees that the voltage detection signal of its storage is the voltage detection signal that described voltage detection module 342 is exported the battery core unit inspection of correspondence in the cycle in current detection.
In other embodiments, can also adopt other triggers or register to substitute d type flip flop and carry out the data storage, as long as can realize similar memory function, each d type flip flop also can be called as a storage unit.
Described voltage detection module 342 is current detection is completed detection to all battery core unit in the cycle after; described logic decision module 346 is carried out logic decision according to all battery core unit of d type flip flop storage in described memory module 344 at voltage detection signal corresponding to current detection cycle; when if at least one voltage detection signal is the abnormal voltage detection signal, described logic decision module 346 output protection signals.Be specially, when charging, described logic decision module 346 is carried out logic decision according to all battery core unit of d type flip flop storage in described memory module 344 at charging voltage detection signal corresponding to current detection cycle, when if at least one charging voltage detection signal is abnormal charging voltage detection signal, described logic decision module 346 output charging overvoltage protection signals, i.e. expression need to be carried out charge protection to electric battery 210; When discharge; described logic decision module 346 is carried out logic decision according to all battery core unit of d type flip flop storage in described memory module 344 at sparking voltage detection signal corresponding to current detection cycle; when if at least one sparking voltage detection signal is abnormal charging voltage detection signal; described logic decision module 346 output discharge under-voltage protection signals, i.e. expression need to be carried out discharge prevention to electric battery 210.
In the utility model in the utility model, " connection ", be connected, word that the expressions such as " company ", " connecing " are electrical connected, if no special instructions, represent direct or indirect electric connection.
It is pointed out that being familiar with any change that the person skilled in art does embodiment of the present utility model does not all break away from the scope of claims of the present utility model.Correspondingly, the scope of claim of the present utility model also is not limited only to previous embodiment.
Claims (10)
1. a voltage detecting circuit, be used for a plurality of battery core unit of series connection are successively carried out voltage detecting, it is characterized in that, it comprises voltage detection module, memory module and logic decision module,
Described voltage detection module detects the voltage of each battery core unit periodically one by one, and the voltage of each battery core unit that will detect and HVT high voltage threshold and/or low pressure threshold compare, with output abnormal voltage detection signal whether;
Described memory module is used for the storage current detection in the cycle, the voltage detection signal corresponding to each battery core unit of described voltage detection module output;
Described logic decision module is carried out logic decision according to all battery core unit of described memory module storage at voltage detection signal corresponding to current detection cycle; when if at least one voltage detection signal is the abnormal voltage detection signal, described logic decision module output protection signal.
2. voltage detecting circuit according to claim 1, is characterized in that,
Whether abnormal in when charging, described voltage detection module detects the voltage of each battery core unit one by one in a sense cycle, and voltage and the HVT high voltage threshold of each battery core unit that will detect compare, to export charging voltage detection signal; Described memory module is stored current detection in the cycle, the charging voltage detection signal corresponding to each battery core unit of described voltage detection module output; Described logic decision module is carried out logic decision according to all battery core unit of described memory module storage at charging voltage detection signal corresponding to current detection cycle; when if at least one charging voltage detection signal is abnormal charging voltage detection signal; described logic decision module output charging overvoltage protection signal
Whether abnormal in when discharge, described voltage detection module detects the voltage of each battery core unit one by one in a sense cycle, and voltage and the low pressure threshold of each battery core unit that will detect compare, to export sparking voltage detection signal; Described memory module is stored current detection in the cycle, the sparking voltage detection signal corresponding to each battery core unit of described voltage detection module output; Described logic decision module is carried out logic decision according to all battery core unit of described memory module storage at sparking voltage detection signal corresponding to current detection cycle; when if at least one sparking voltage detection signal is the paradoxical discharge voltage detection signal, described logic decision module output discharge under-voltage protection signal.
3. voltage detecting circuit according to claim 1, it is characterized in that, each battery core unit is to there being a clock signal, and the cycle of the clock signal that each battery core unit is corresponding is identical with described sense cycle, in a sense cycle, the significant level of the clock signal that each battery core unit is corresponding is not overlapping mutually
Described voltage detecting circuit also comprises control module, when a clock signal corresponding to battery core unit is significant level, described control module is connected to this battery core unit with described voltage detection module, and described voltage detection module is detected this battery core unit; When a clock signal corresponding to battery core unit was inactive level, described control module was not connected described voltage detection module with this battery core unit.
4. voltage detecting circuit according to claim 3, it is characterized in that, described control module comprises many to switch, the corresponding pair of switches in each battery core unit, every pair of switch comprises the first switch and second switch, the first switch of often splitting the Central Shanxi Plain is connected between the first link with this positive pole to battery core unit corresponding to switch and voltage detection unit, the second switch of often splitting the Central Shanxi Plain is connected between the second link with this negative pole to battery core unit corresponding to switch and voltage detection unit, and the control end of every pair of switch all is connected to clock signal corresponding to battery core unit corresponding to switch with this,
When a clock signal corresponding to battery core unit is significant level, the pair of switches all conducting corresponding with this battery core unit; When a clock signal corresponding to battery core unit was inactive level, the pair of switches corresponding with this battery core unit all turn-offed.
5. voltage detecting circuit according to claim 3, is characterized in that, described voltage detection module comprises voltage/current modular converter, current comparing module and reference current module,
Described voltage/current modular converter is electric current with the voltage transitions of described battery core unit;
Described reference current module is used for generating the first reference current of corresponding HVT high voltage threshold and/or the second reference current of corresponding low pressure threshold;
Whether abnormal described current comparing module is used for the first reference current of the corresponding HVT high voltage threshold that the switching current of described voltage/current modular converter output and described reference current module are generated and/or the second reference current of corresponding low pressure threshold compares, to export voltage detection signal.
6. voltage detecting circuit according to claim 5, is characterized in that,
When charging, described reference current module generates the first reference current of corresponding HVT high voltage threshold; Described voltage/current modular converter carries out current conversion with the voltage of each battery core unit one by one in a sense cycle, and the switching current that the voltage of each battery core unit is corresponding and described the first reference current compare, with output abnormal charging voltage detection signal whether;
When discharge, described reference current module generates the second reference current of corresponding low pressure threshold; Described voltage/current modular converter carries out current conversion with the voltage of each battery core unit one by one in a sense cycle, and the switching current that the voltage of each battery core unit is corresponding and described the second reference current compare, with output abnormal sparking voltage detection signal whether.
7. voltage detecting circuit according to claim 5, it is characterized in that, described memory module comprises a plurality of storage unit, the corresponding storage unit in each battery core unit, the clock signal that the battery core unit that the clock end of each storage unit is corresponding with it is corresponding is connected, the input end of each storage unit is connected with the output terminal of described current comparing module, and its output terminal is connected with described logic decision module
When the significant level of the clock signal of receiving when the clock termination of a storage unit finished, it latched the voltage detection signal of the output terminal of the described current comparing module that its input end receives.
8. voltage detecting circuit according to claim 5, it is characterized in that, except the first link and the second link, described voltage/current modular converter also comprises output terminal, the first resistance R C, the second resistance R A, the 3rd resistance R B, the first operational amplifier OA1 and a PMOS transistor MP1
The second resistance R A and the 3rd resistance R B are series between described the first link and the second link successively; The first resistance R C and a PMOS strings of transistors are coupled between the first link and output terminal; The normal phase input end of described operational amplifier is connected with the connected node between the second resistance R A and the 3rd resistance R B, its negative-phase input is connected with the connected node between a described PMOS transistor and the first resistance R C, and its output terminal is connected with a described transistorized grid of PMOS.
9. voltage detecting circuit according to claim 8, is characterized in that, described reference current module comprises bandgap voltage reference, the second operational amplifier, the 3rd nmos pass transistor, the 2nd PMOS transistor, the 3rd PMOS transistor and resistance R 0,
The source electrode of described the 2nd PMOS transistor and the 3rd PMOS crystal is connected with power end; Described the 2nd transistorized grid of PMOS is connected with the grid of the 3rd PMOS crystal; Described the 2nd transistorized grid of PMOS is connected with its drain electrode; Described the 3rd nmos pass transistor and resistance R 0 be series at the 2nd transistorized drain electrode of PMOS and systematically between, the drain electrode of described the 3rd PMOS transistor MP3 is the output terminal of described reference current module; The normal phase input end of described the second operational amplifier is connected with described bandgap voltage reference, its negative-phase input is connected with the connected node between the 3rd nmos pass transistor and variable resistor, its output terminal is connected with the grid of the 3rd nmos pass transistor, and the electric current of the drain electrode output of described PMOS transistor MP3 is the reference current that described reference current module produces.
10. a battery protection system, is characterized in that, it comprises electric battery, switch combination circuit, control circuit and voltage detecting circuit,
Described electric battery comprises a plurality of battery core unit of series connection successively, and a link of higher level's battery core unit is connected with the anode link, and a link of subordinate's battery core unit is connected in the battery cathode link by described switch combination circuit,
Described switch combination circuit comprises charging control switch and the discharge control switch of series connection,
Described voltage detecting circuit is described voltage detecting circuit as arbitrary in claim 1-9,
Described control circuit controls described charging control switch according to the guard signal of described voltage detecting circuit output or discharge control switch ends to carry out the charge or discharge protection.
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| CN2013203004772U CN203299255U (en) | 2013-05-27 | 2013-05-27 | Voltage detection circuit formed by connecting a plurality of electric core units in series and battery protection system |
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| CN2013203004772U CN203299255U (en) | 2013-05-27 | 2013-05-27 | Voltage detection circuit formed by connecting a plurality of electric core units in series and battery protection system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323645A (en) * | 2013-05-27 | 2013-09-25 | 无锡中星微电子有限公司 | Voltage detecting circuit of multiple cell units in series and battery protecting system |
| CN111263889A (en) * | 2017-10-24 | 2020-06-09 | 大陆汽车有限责任公司 | Method for operating a battery sensor and battery sensor |
| CN114256894A (en) * | 2020-09-23 | 2022-03-29 | 圣邦微电子（北京）股份有限公司 | Charging management circuit and rechargeable electronic device |
-
2013
- 2013-05-27 CN CN2013203004772U patent/CN203299255U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323645A (en) * | 2013-05-27 | 2013-09-25 | 无锡中星微电子有限公司 | Voltage detecting circuit of multiple cell units in series and battery protecting system |
| CN103323645B (en) * | 2013-05-27 | 2016-03-16 | 无锡中感微电子股份有限公司 | The voltage detecting circuit of multiple battery core units in series and battery protection system |
| CN111263889A (en) * | 2017-10-24 | 2020-06-09 | 大陆汽车有限责任公司 | Method for operating a battery sensor and battery sensor |
| CN111263889B (en) * | 2017-10-24 | 2022-06-21 | 大陆汽车有限责任公司 | Method for operating a battery sensor and battery sensor |
| CN114256894A (en) * | 2020-09-23 | 2022-03-29 | 圣邦微电子（北京）股份有限公司 | Charging management circuit and rechargeable electronic device |
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