CN209280886U - Cell measurement circuit and electronic equipment - Google Patents
Cell measurement circuit and electronic equipment Download PDFInfo
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- CN209280886U CN209280886U CN201821993329.2U CN201821993329U CN209280886U CN 209280886 U CN209280886 U CN 209280886U CN 201821993329 U CN201821993329 U CN 201821993329U CN 209280886 U CN209280886 U CN 209280886U
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Abstract
The utility model provides a kind of cell measurement circuit and electronic equipment, which includes voltameter and conversion module, and the first end of the conversion module and the first pole of battery core connect, and the second end of the conversion module is connect with safety detection end；First sampling end of the voltameter and the second pole of battery core connect, and the second sampling end of the voltameter is connect with the third end of the conversion module；In the case where the conversion module detects power supply circuit failure, the second end of the conversion module is connect with the third end of the conversion module；In the case where the conversion module detects the normal situation of power supply circuit, the first end of the conversion module is connect with the third end of the conversion module.Cell measurement circuit provided by the utility model and electronic equipment are able to ascend the accuracy for the information about power that voltameter measurement obtains.
Description
Technical field
The present invention relates to electrical measurement technical field more particularly to a kind of cell measurement circuit and electronic equipments.
Background technique
With the development of science and technology, occurring that use can be reduced to the technology of quickly charging battery, rapid nitriding
The problem of standby communication terminals charging time such as family, liked by the majority of consumers.Currently, many rapid nitridings are to pass through
Increase charging current and shortens the charging time to realize.
In the prior art, electronic equipment would generally detect the information about power of battery core and be shown by voltameter, with
The service condition of electricity is understood convenient for user, two sampling ends of usual voltameter are connect with battery respectively, and due in battery
Portion further includes battery protection unit other than battery core, and battery protection unit is connected on charging path, and battery protection unit can be
Floating high voltage is generated in the biggish situation of charging current, the information about power for causing electronic equipment to obtain by voltameter measurement is accurate
It spends lower.
Summary of the invention
The embodiment of the present invention provides a kind of cell measurement circuit and electronic equipment, is obtained with solving voltameter measurement electronic equipment
The lower problem of the information about power accuracy arrived.
In order to solve the above technical problems, the present invention is implemented as follows:
In a first aspect, being applied to power supply circuit, the power supply electricity the embodiment of the invention provides a kind of cell measurement circuit
Road includes battery core and battery protection unit, and the battery protection unit is connect with the battery core, and the battery protection unit includes
Charge control end, discharge control terminal, charge protection unit and discharge prevention unit；The charge control end of the battery protection unit
It is connect with the charge protection unit, the discharge control terminal of the battery protection unit is connect with the discharge prevention unit；Institute
Stating cell measurement circuit includes voltameter and conversion module, and the charge protection unit and the discharge prevention unit are series at institute
It states between voltameter and the first pole of the battery core；The control terminal of the conversion module respectively with the charge control end, described
Discharge control terminal connection, and for the power supply circuit according to the signal detection that the control terminal receives whether failure, it is described
The first end of conversion module is connect with the first pole of the battery core, and the second end of the conversion module is connect with safety detection end；
First sampling end of the voltameter is connect with the second pole of the battery core, the second sampling end of the voltameter and the conversion
The third end of module connects；
In the case where the conversion module detects the power supply circuit failure, the second end of the conversion module and institute
State the third end connection of conversion module；In the case where the conversion module detects the normal situation of the power supply circuit, the conversion
The first end of module is connect with the third end of the conversion module；
Wherein, the Different electrodes in the anode and cathode of first pole and the described second extremely described battery core, the peace
Full test side is the first pole of the battery core by the test side after the protection location of the power supply pond.
Second aspect, the embodiment of the present invention also provide a kind of electronic equipment, including cell measurement circuit as described above.
In embodiments of the present invention, in the case where the conversion module detects the power supply circuit failure, described turn
The second end of mold changing block is connect with the third end of the conversion module；Detect that the power supply circuit is normal in the conversion module
In the case where, the first end of the conversion module is connect with the third end of the conversion module.In this way, there is event in power supply circuit
When barrier, battery protection unit can protect voltameter against damages；Power supply circuit work normally when, voltameter can respectively with
The anode of battery core, cathode connection, promote the accuracy for the information about power that voltameter measurement obtains.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, needed in being described below to the embodiment of the present invention
Attached drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention,
For those of ordinary skill in the art, without any creative labor, it can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of circuit diagram of cell measurement circuit provided in an embodiment of the present invention；
Fig. 2 is the circuit diagram of another cell measurement circuit provided in an embodiment of the present invention；
Fig. 3 is the circuit diagram of another cell measurement circuit provided in an embodiment of the present invention；
Fig. 4 is the circuit diagram of another cell measurement circuit provided in an embodiment of the present invention；
Fig. 5 is the circuit diagram of another cell measurement circuit provided in an embodiment of the present invention；
Fig. 6 is the circuit diagram of another cell measurement circuit provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
Fig. 1 and Fig. 2 are please referred to, the embodiment of the present invention provides a kind of cell measurement circuit, is applied to power supply circuit, power supply electricity
Road includes battery core 110 and battery protection unit 120, and the battery protection unit 120 is connect with the battery core 110, the battery
Protection location 120 includes charge control end CO, discharge control terminal DO, charge protection unit 121 and discharge prevention unit 122；Institute
The charge control end CO for stating battery protection unit 120 is connect with the charge protection unit 121, and battery protection unit 120 is put
Electric control end DO is connect with the discharge prevention unit 122；The cell measurement circuit includes voltameter 130 and conversion module
140, the charge protection unit 121 and the discharge prevention unit 122 are series at the voltameter 130 and the battery core 110
The first pole between；The conversion module 140 is connect with the charge control end CO, the discharge control terminal DO respectively, is used in combination
In the power supply circuit according to the signal detection received whether failure, the first end A1 of the conversion module 140 and the electricity
First pole of core 110 connects, and the second end A2 of the conversion module 140 is connect with safety detection end；The of the voltameter 130
One sampling end is connect with the second pole of the battery core 110, the second sampling end of the voltameter 130 and the conversion module 140
The A3 connection of third end；
In the case where the conversion module 140 detects the power supply circuit failure, the second of the conversion module 140
End A2 is connect with the third end A3 of the conversion module 140；Detect that the power supply circuit is normal in the conversion module 140
In the case of, the first end A1 of the conversion module 140 is connect with the third end A3 of the conversion module 140；
Wherein, the Different electrodes in the anode and cathode of first pole and the described second extremely described battery core 110, it is described
Safety detection end is the first pole of the battery core 110 by the test side after the battery protection unit 120.
Power supply circuit belongs to battery pack, and battery pack includes two signal detection ends, and one is safety detection end, the other is
Fixed test end, wherein fixed test end is connect with the second pole of battery core 110, the first sampling end of voltameter 130 and fixed inspection
Surveying end connection can directly connect with the second pole of battery core 110.
In the first extremely anode of battery core 110, the safety detection end is the anode of battery, and fixed test end is battery
Cathode (as shown in Figure 2) is connect with the cathode of battery core 110；In the first extremely cathode of battery core 110, the safety detection end
For the cathode of battery, fixed test end is that the anode of the positive and battery core 110 of battery connect (as shown in Figure 1).Charge protection list
When member 121 and discharge prevention unit 122 are connected between the first pole of battery core 110 and safety detection end, charge protection unit 121
It can be and be located at discharge prevention unit 122 close to the side (as shown in Figure 2) of the first pole, be also possible to be located at discharge prevention list
Side (as shown in fig. 1) of the member 122 close to safety detection end.
The power end VDD of battery protection unit 120 can be connect through first resistor R1 with the anode of battery core 110, to obtain
Operating voltage；120 common end VSS of battery protection unit can be connect with the cathode of battery core 110；In battery protection unit 120
Power end and ground terminal can carry out breaking processing when being connected on same branch by first capacitor C1.In addition, battery protection list
Member 120 voltage detection terminal VM can be connect through second resistance R2 with safety detection end, for detect battery core 110 the first pole and
Voltage parameter between safety detection end, for judging whether power supply circuit breaks down.
The charge control end CO of battery protection unit 120 is connect with charge protection unit 121, battery protection unit 120
Discharge control terminal DO is connect with discharge prevention unit 122, charging over-voltage, charging overcurrent, electric discharge overcurrent, mistake occurs in power supply circuit
Put, the failures such as short circuit when, protection battery core 110 makes charge protection by charge control end CO and discharge control terminal DO sending signal
Unit 121 and discharge prevention unit 122 respectively act, to protect to power supply circuit.
Currently, if two sampling ends of voltameter 130 are directly connected to the anode of battery core 110, cathode, safety
Property it is lower, once may burn out voltameter 130 leads to the failure of voltameter 130 simultaneously for example, short trouble occurs in power supply circuit
Security risk is caused to battery core 110；Once over-discharge failure occurs for power supply circuit, electric leakage can be generated, 110 depth mistake of battery core is caused
It puts, causes battery core 110 that can not reuse.
In view of above-mentioned safety defect, the first sampling end of voltameter 130 is connected to the second pole of battery core 110, by electricity
Second sampling end of meter 130 is connected to the third end A3 of conversion module 140.Electric discharge is received by the control terminal A4 of conversion module 140
The signal that control terminal DO and charge control end CO is issued, conversion module 140 are used for the control of discharge according to battery protection unit 120
Whether the signal detection power supply circuit that end DO and charge control end CO is issued breaks down, will be electric when power supply circuit breaks down
Second sampling end of meter 130 is connect with safety detection end, to improve the safety of circuit；When power supply circuit works normally
Second sampling end of voltameter 130 is connect with the first pole of battery core 110, so that promoting voltameter 130 measures obtained electricity
The accuracy of information.Wherein it is possible to an electricity of connecting between the first sampling end of voltameter 130 and the second pole of battery core 110
Resistance, a resistance of connecting between the second sampling end of voltameter 130 and the third end A3 of conversion module 140 reduce electric current,
Ensure the normal use of voltameter 130.
In addition, it is necessary to explanation, voltameter 130 can be set on the battery protecting plate in battery pack, certain electricity
Meter 130 also can be set outside battery pack, and this is not limited by the present invention.
In embodiments of the present invention, described in the case where the conversion module 140 detects the power supply circuit failure
The second end A2 of conversion module 140 is connect with the third end A3 of the conversion module 140；It is detected in the conversion module 140
In the normal situation of power supply circuit, the third end A3 of the first end A1 of the conversion module 140 and the conversion module 140
Connection.In this way, battery protection unit 120 can protect voltameter 130 against damages when power supply circuit breaks down；In electricity
When core 110 works normally, voltameter 130 can be connect with the anode of battery core 110, cathode respectively, promoted voltameter 130 and measured
The accuracy of the information about power arrived is also beneficial to ladder charging, flexible flat cable (Flexible Flat Cable, abbreviation
FFC) the development and realization of the accurate charging technique such as charging.
In some alternative embodiments, as shown in figure 3, the conversion module 140 includes that control unit 141 and switching are single
Member 142, the signal input part of described control unit 141 is connect with the charge control end CO, the discharge control terminal DO；It is described
The signal output end of control unit 141 is connect with the signal input part of the switch unit 142, and the of the switch unit 142
One end B1 is connect with 110 first pole of battery core, and the second end B2 of the switch unit 142 is connect with the safety detection end,
The third end B3 of the switch unit 142 is connect with the second sampling end of the voltameter 130.
Battery protection unit 120 can be issued in the case where detecting that power supply circuit breaks down by charge control end CO
Signal make charge protection unit 121, and/or, discharge prevention unit 122 is made by signal that discharge control terminal DO is issued
It is acted to protect circuit, therefore the signal input part C1 of control unit 141 is received into charge control end CO and control of discharge
The signal for holding DO to issue, is able to detect whether power supply circuit the failures such as overcurrent, charging over-voltage, electric discharge overcurrent that charge occurs.
When control unit 141 detects that power supply circuit breaks down, by signal output end C2 to switch unit 142
Input terminal B4 send protection signal, switch unit 142 receive protection signal after by the second end B2 of switch unit 142 and switching
The third end B3 connection of unit 142, so that the first sampling end of voltameter 130 be made to connect with safety detection end, voltameter at this time
130 can obtain the protection of charge protection unit 121 and discharge prevention unit 122.
When control unit 141 detects that power supply circuit operates normally, by signal output end C2 to switch unit 142
Input terminal B4 send detection signal, switch unit 142 receive detection signal after by the first end B1 of switch unit 142 and switching
The third end B3 connection of unit 142, so that it connect the second sampling end of voltameter 130 with the first pole of battery core 110, it is electric at this time
Meter 130 is capable of the charge volume or discharge capacity of precise measurement battery core 110.
In some alternative embodiments, the switch unit 142 may include switching switch, and the of the switching switch
One stationary contact is connect with the first pole of the battery core 110, and the second stationary contact of the switching switch and the safety detection end connect
It connects, the movable contact of the switching switch is connect with the second sampling end of the voltameter 130.
When receiving protection signal, movable contact is connect with the second stationary contact switching switch automatically, to make voltameter 130
The second sampling end connect with safety detection end, voltameter 130 can obtain charge protection unit 121 and discharge prevention list at this time
The protection of member 122；When receiving detection signal, movable contact is connect with the first stationary contact switching switch automatically, to make electricity
Second sampling end of meter 130 is connect with the first pole of battery core 110, and voltameter 130 is capable of the charging of precise measurement battery core 110 at this time
Amount or discharge capacity.
In the present embodiment, connection is switched between two static contacts by the moving contact of switching switch, reaches switching electricity
Second sampling end of meter 130 switches over the effect of connection between the first pole and safety detection end of battery core 110, and principle is simple
High reliablity.
In other optional embodiments, as shown in Figure 4-Figure 6, the switch unit 142 includes the first field-effect tube
Q1 and the second field-effect tube Q2；
The source electrode of the first field-effect tube Q1 is connect with the second sampling end of the voltameter 130, first effect
Should the drain electrode of pipe Q1 connect with the first pole of the battery core 110；
The drain electrode of the second field-effect tube Q2 is connect with the second sampling end of the voltameter 130, second effect
Should the source electrode of pipe Q2 connect with the safety detection end, the grid of the second field-effect tube Q2 and the first field-effect tube Q1
Grid connection.
In the present embodiment, the gate turn-on condition of the first field-effect tube Q1 and the second field-effect tube Q2 are different, such as: first
Field-effect tube Q1 can be P-channel MOSFET, and the second field-effect tube Q2 can be N-channel MOS FET.At this point, control unit 141
High level signal can be exported, the source electrode and drain electrode of the first field-effect tube Q1 is connected, i.e., the second sampling end of voltameter 130 with
First pole of battery core 110 connects, and the source electrode and drain electrode of the second field-effect tube Q2 disconnects.Control unit 141 can export low level
Signal disconnects the source electrode and drain electrode of the first field-effect tube Q1, the source electrode and drain electrode conducting of the second field-effect tube Q2, i.e. voltameter
130 the second sampling end is connect with safety detection end.It is of course also possible to be the first field-effect tube Q1 can for N-channel MOS FET,
Second field-effect tube Q2 can be P-channel MOSFET, can also be that the first field-effect tube Q1 and the second field-effect tube Q2 is identical
The MOSFET of channel, but respective gate-on voltage is different.For the first field-effect tube Q1 and second in the present embodiment
Effect pipe Q2 is specially which kind of form is not construed as limiting.
In the present embodiment, using two field-effect tube of different gate turn-on conditions collectively as switch unit 142, so that
Second sampling end of voltameter 130 can switch connection between the first pole of battery core 110, safety detection end respectively, have original
The simple and at low cost feature of reason, in addition, the first field-effect tube Q1 and the second field-effect tube Q2 can be integrated in battery pack
In circuit board, convenient for the lightening design of battery pack.
In other optional embodiments, described control unit 141 may include NAND gate sub-circuit, the NAND gate
The input terminal of sub-circuit is connect with the discharge control terminal DO, the charge control end CO respectively, the NAND gate sub-circuit
Output end is connect with the grid of the first field-effect tube Q1.Specifically, NAND gate sub-circuit includes two input terminals, wherein
One input terminal is connect with the discharge control terminal DO, another input terminal is connect with the charge control end CO.
In the present embodiment, discharge control terminal DO exports high level signal triggering discharge prevention unit 122 and acts, charge control
It holds CO output high level signal triggering charge protection unit 121 to act, therefore, detects the signal for indicating power supply circuit failure
(discharge control terminal exports high level signal and/or charge control end exports high level signal), i.e., it is believed that power supply circuit occurs
Failure；Detecting indicates that (discharge control terminal exports low level signal to the normal signal of power supply circuit and the output of charge control end is low
Level signal), i.e., it is believed that power supply circuit works normally.
NAND gate sub-circuit can export low level signal, NAND gate after detecting the signal for indicating power supply circuit failure
Sub-circuit can export high level signal after receiving the expression normal signal of power supply circuit.By connecing switch unit 142
The second end B2 of switch unit 142 is connect with the third end B3 of switch unit 142 when receiving low level signal, i.e. voltameter 130
The second sampling end connect with safety detection end, can play the role of protect voltameter 130；Switch unit 142 is receiving height
The first end B1 of switch unit 142 is connect with the third end B3 of switch unit 142 when level signal, i.e. the of voltameter 130
Two sampling ends are connect with the first pole of battery core 110, that is, voltameter 130 can be improved to the accuracy of electric power detection.
In some other embodiments, however not excluded that discharge control terminal DO exports low level signal and triggers discharge prevention unit
122 movements, charge control end CO exports the case where low level signal triggering charge protection unit 121 acts, in these embodiments
Expression power supply circuit failure signal and the expression normal signal of power supply circuit it is different from the present embodiment, but principle and control
Thinking be it is identical, can unambiguously derive, to avoid repeating, not illustrate one by one herein.
Optionally, as shown in Figure 4 and Figure 5, the NAND gate sub-circuit includes third field-effect tube Q3, the 4th field-effect tube
Q4, the 5th field-effect tube Q5 and the 6th field-effect tube Q6；
The grid of the third field-effect tube Q3 is connect with the discharge control terminal DO, the source of the third field-effect tube Q3
Pole is connect with the drain electrode of the 4th field-effect tube Q4, and the grid of the 4th field-effect tube Q4 is connect with the charge control end CO,
The source electrode of the 4th field-effect tube Q4 is connect with the safety detection end；
The grid of the 5th field-effect tube Q5 is connect with the grid of the 4th field-effect tube Q4, the 5th field-effect
The source electrode of pipe Q5 is connect with the drain electrode of the third field-effect tube Q3, the drain electrode and the battery core of the 5th field-effect tube Q5
110 anode connection；
The grid of the 6th field-effect tube Q6 is connect with the grid of the third field-effect tube Q3, the 6th field-effect
The source electrode of pipe Q6 is connect with the drain electrode of the third field-effect tube Q3, the drain electrode and the battery core of the 6th field-effect tube Q6
110 anode connection；
The grid of the first field-effect tube Q1 is connect with the source electrode of the 6th field-effect tube Q6.
Wherein, third field-effect tube Q3 and the 4th field-effect tube Q4 can be N-channel MOS FET, the 5th field-effect tube Q5 and
6th field-effect tube Q6 can be P-channel MOSFET.In addition, the drain electrode of the 5th field-effect tube Q5 and the leakage of the 6th field-effect tube Q6
The voltage for being extremely connected with an offer input voltage jointly provides terminal, is connected in present embodiment by increasing 3rd resistor R3
Mode between the drain electrode of the anode and the 5th field-effect tube Q5 of battery core 110, the drain electrode and the 6th to the 5th field-effect tube Q5
The drain electrode of field-effect tube Q6 provides input voltage.
By taking high level drives charge protection unit 121 and discharge prevention unit 122 as an example: being exported in discharge control terminal DO high
In the case where level signal and/or charge control end CO output high level signal, the first field-effect tube Q1 and the second field-effect tube
The grid of Q2 receives low level, so that the drain electrode of the first field-effect tube Q1 and source electrode disconnect, the drain electrode of the second field-effect tube Q2 and
Second sampling end of source conduction, i.e. voltameter 130 is connect with safety detection end.
In the case where discharge control terminal exports low level signal and charge control end output low level signal, first effect
Should the grid of pipe Q1 and the second field-effect tube Q2 receive high level, thus drain electrode and the source conduction of the first field-effect tube Q1,
The drain electrode of two field-effect tube Q2 and source electrode disconnect, i.e., the second sampling end of voltameter 130 is connect with the first pole of battery core 110.
In the present embodiment, NAND gate sub-circuit is formed by four field-effect tube, passes through detection discharge control terminal and charging
The low and high level of control terminal output exports corresponding switching signal, enables switch unit 142 according to switching signal by voltameter
130 second sampling ends are connect with the first pole of safety detection end or battery core 110.The control unit 141 of four field-effect tube composition
It is simply and at low cost to have the characteristics that connection type, in addition, four field-effect tube can be integrated in the circuit board in battery pack,
Convenient for the lightening design of battery pack.
In other optional embodiments, described control unit 141 include with door sub-circuit, it is described with door sub-circuit
Input terminal is connect with the charge control end CO, the discharge control terminal DO respectively, the output end and institute with door sub-circuit
State the grid connection of the first field-effect tube Q1.Specifically, including two input terminals with door sub-circuit, wherein input terminal with
The charge control end CO connection, another input terminal are connect with the discharge control terminal DO.
In the present embodiment, discharge control terminal DO exports high level signal triggering discharge prevention unit 122 and acts, charge control
It holds CO output high level signal triggering charge protection unit 121 to act, therefore, detects the signal for indicating power supply circuit failure
(discharge control terminal exports high level signal and/or charge control end exports high level signal), i.e., it is believed that power supply circuit occurs
Failure；Detecting indicates that (discharge control terminal exports low level signal to the normal signal of power supply circuit and the output of charge control end is low
Level signal), i.e., it is believed that power supply circuit works normally.
With door sub-circuit after detecting the signal for indicating power supply circuit failure, high level signal can be exported, with Men Zi electricity
Road can export low level signal after receiving the expression normal signal of power supply circuit.By making switch unit 142 receive height
The second end B2 of switch unit 142 is connect with the third end B3 of switch unit 142 when level signal, i.e. the of voltameter 130
Two sampling ends are connect with safety detection end, can play the role of protecting voltameter 130；Switch unit 142 is receiving low level
The first end B1 of switch unit 142 is connect with the third end B3 of switch unit 142 when signal, i.e., the second of voltameter 130 is adopted
Sample end is connect with the first pole of battery core 110, that is, voltameter 130 can be improved to the accuracy of electric power detection.
In some other embodiments, however not excluded that discharge control terminal DO exports low level signal and triggers discharge prevention unit
122 movements, charge control end CO exports the case where low level signal triggering charge protection unit 121 acts, in these embodiments
Expression power supply circuit failure signal and the expression normal signal of power supply circuit it is different from the present embodiment, but principle and control
Thinking be it is identical, can unambiguously derive, to avoid repeating, not illustrate one by one herein.
Optionally, as shown in fig. 6, described include the 7th field-effect tube Q7 and the 8th field-effect tube Q8 with door sub-circuit；
The grid of the 7th field-effect tube Q7 is connect with the discharge control terminal DO, the source of the 7th field-effect tube Q7
Pole is connect with the drain electrode of the 8th field-effect tube Q8, and the drain electrode of the 7th field-effect tube Q7 is connect with the anode of the battery core 110；
The grid of the 8th field-effect tube Q8 is connect with the charge control end CO, the source of the 8th field-effect tube Q8
Pole is connect with the safety detection end.
Wherein, the 7th field-effect tube Q7 can be N-channel MOS FET, and the 8th field-effect tube Q8 can be P-channel MOSFET,
And the first field-effect tube Q1 is P-channel MOSFET, and the second field-effect tube Q2 is N-channel MOS FET.In addition, the 7th field-effect tube
The voltage that the drain electrode of Q7 is connected with an offer input voltage provides terminal, is gone here and there in present embodiment by increasing by the 4th resistance R4
The mode being associated between the drain electrode of the anode and the 7th field-effect tube Q7 of battery core 110 is provided to the drain electrode of the 7th field-effect tube Q7
Input voltage.
By taking high level drives charge protection unit 121 and discharge prevention unit 122 as an example: being exported in discharge control terminal DO high
In the case where level signal and/or charge control end CO output high level signal, the first field-effect tube Q1 and the second field-effect tube
The grid of Q2 receives high level, so that the drain electrode of the first field-effect tube Q1 and source electrode disconnect, the drain electrode of the second field-effect tube Q2 and
Second sampling end of source conduction, i.e. voltameter 130 is connect with safety detection end.
In the case where discharge control terminal DO exports low level signal and charge control end CO output low level signal, first
The grid of field-effect tube Q1 and the second field-effect tube Q2 receive low level, so that the drain electrode of the first field-effect tube Q1 and source electrode are led
Logical, the drain electrode of the second field-effect tube Q2 and source electrode disconnect, i.e., the first pole of the second sampling end of voltameter 130 and battery core 110 connects
It connects.
In the present embodiment, by two field-effect tube compositions and door sub-circuit, pass through detection discharge control terminal DO and charging
The low and high level of control terminal CO output exports corresponding switching signal, enables switch unit 142 according to switching signal by electricity
130 second sampling ends are counted to connect with the first pole of safety detection end or battery core 110.The connection types of two field-effect tube is simple,
At low cost and small volume is convenient for being integrated in battery pack.
In some alternative embodiments, as shown in figures 3 to 6, the discharge prevention unit 122 includes the 9th field-effect
Pipe Q9, the charge protection unit 121 include the tenth field-effect tube Q10；
The grid of the 9th field-effect tube Q9 is connect with the discharge control terminal DO, the source of the 9th field-effect tube Q9
Pole is connect with the first pole of the battery core 110, the drain electrode of the 9th field-effect tube Q9 and the source of the tenth field-effect tube Q10
Pole connection, the grid of the tenth field-effect tube Q10 are connect with the charge control end CO, the tenth field-effect tube Q10's
Drain electrode is connect with the safety detection end.
When battery protection unit 120 detects that power supply circuit is to work normally, discharge control terminal DO controls the 9th effect
Should pipe Q9 source electrode and drain electrode conducting, charge control end CO control the tenth field-effect tube Q10 source electrode and drain electrode conducting.In battery
When protection location 120 detects that charging over-voltage, the charging charge faults such as overcurrent occurs in power supply circuit, charge control end CO control the
The source electrode and drain electrode of ten field-effect tube Q10 disconnects, to protect power supply circuit；Power supply circuit is detected in battery protection unit 120
When there are the discharge faults such as electric discharge overcurrent, the source electrode and drain electrode that discharge control terminal DO controls the 9th field-effect tube Q9 is disconnected, to protect
Protect power supply circuit.
In the present embodiment, leading between the first pole of battery core 110 and safety detection end is controlled by two field-effect tube
On-off is opened, and the effect of charge protection and discharge prevention is played, and principle is simple and reliable.
Further, the discharge prevention unit 122 further includes the first freewheeling diode, first freewheeling diode
Anode is connect with the source electrode of the 9th field-effect tube Q9, the cathode of first freewheeling diode and the 9th field-effect tube
The drain electrode of Q9 connects；
The charge protection unit 121 further includes the second freewheeling diode, the anode of second freewheeling diode and institute
State the drain electrode connection of the tenth field-effect tube Q10, the source of the cathode of second freewheeling diode and the tenth field-effect tube Q10
Pole connection.
When the source electrode and drain electrode of the 9th field-effect tube Q9 disconnects, i.e., between the first pole and safety detection end of battery core 110
The moment of disconnection will receive the impulse of high back voltage electricity, and the first freewheeling diode in parallel can protect the 9th field-effect tube Q9.Together
Sample, the second freewheeling diode can also protect the tenth field-effect tube Q10.In addition, current direction and electric discharge in charging process
Current direction in the process is on the contrary, therefore the direction of the first freewheeling diode is contrary with the second freewheeling diode.
In the present embodiment, the source electrode and drain electrode of field-effect tube is connected in parallel on by freewheeling diode, it is on the scene so as to avoid
The source electrode and drain electrode of effect pipe is reversed high-voltage electricity breakdown when disconnecting, extend discharge prevention unit 122 and charge protection unit 121
Service life.
The embodiment of the present invention also provides a kind of electronic equipment, including cell measurement circuit as described above.
Electronic equipment provided in an embodiment of the present invention has cell measurement circuit described in above-described embodiment, therefore also the same
Has the beneficial effect that above-mentioned cell measurement circuit has.
In the embodiment of the present invention, above-mentioned electronic equipment can be any electronic equipment including battery, such as: mobile phone is put down
Plate computer (Tablet Personal Computer), laptop computer (Laptop Computer), personal digital assistant
(personal digital assistant, abbreviation PDA), mobile Internet access device (Mobile Internet Device, MID)
Or wearable device (Wearable Device) etc..
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in a storage medium
In (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a terminal (can be mobile phone, computer, service
Device, air conditioner or network equipment etc.) execute method described in each embodiment of the present invention.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form belongs within protection of the invention.
Claims (10)
1. a kind of cell measurement circuit, it is applied to power supply circuit, the power supply circuit includes battery core and battery protection unit, described
Battery protection unit is connect with the battery core, and the battery protection unit includes charge control end, discharge control terminal, charge protection
Unit and discharge prevention unit；The charge control end of the battery protection unit is connect with the charge protection unit, the electricity
The discharge control terminal of pond protection location is connect with the discharge prevention unit；It is characterized in that, the cell measurement circuit includes
Voltameter and conversion module, the charge protection unit and the discharge prevention unit are series at the voltameter and the battery core
The first pole between；The conversion module is connect with the charge control end, the discharge control terminal respectively, and is connect for basis
Power supply circuit described in the signal detection received whether failure, the first pole of the first end of the conversion module and the battery core connects
It connects, the second end of the conversion module is connect with safety detection end；The of first sampling end of the voltameter and the battery core
The connection of two poles, the second sampling end of the voltameter are connect with the third end of the conversion module；
In the case where the conversion module detects the power supply circuit failure, the second end of the conversion module with described turn
Change the mold the third end connection of block；In the case where the conversion module detects the normal situation of the power supply circuit, the conversion module
First end connect with the third end of the conversion module；
Wherein, the Different electrodes in the anode and cathode of first pole and the described second extremely described battery core, the safety inspection
It surveys the first pole that end is the battery core and passes through the test side after the battery protection unit.
2. cell measurement circuit according to claim 1, which is characterized in that the conversion module includes control unit and cuts
Unit is changed, the signal input part of described control unit is connect with the charge control end, the discharge control terminal respectively；The control
The signal output end of unit processed is connect with the signal input part of the switch unit, the first end of the switch unit and the electricity
First pole of core connects, and the second end of the switch unit is connect with the safety detection end, the third end of the switch unit
It is connect with the second sampling end of the voltameter.
3. cell measurement circuit according to claim 2, which is characterized in that the switch unit includes the first field-effect tube
With the second field-effect tube；
The source electrode of first field-effect tube is connect with the second sampling end of the voltameter, the drain electrode of first field-effect tube
It is connect with the first pole of the battery core；
The drain electrode of second field-effect tube is connect with the second sampling end of the voltameter, the source electrode of second field-effect tube
It is connect with the safety detection end, the grid of second field-effect tube is connect with the grid of first field-effect tube.
4. cell measurement circuit according to claim 3, which is characterized in that described control unit includes NAND gate son electricity
Road, the input terminal of the NAND gate sub-circuit are connect with the discharge control terminal, the charge control end respectively, the NAND gate
The output end of sub-circuit is connect with the grid of first field-effect tube.
5. cell measurement circuit according to claim 4, which is characterized in that the NAND gate sub-circuit includes third field effect
Ying Guan, the 4th field-effect tube, the 5th field-effect tube and the 6th field-effect tube；
The grid of the third field-effect tube is connect with the charge control end, the source electrode of the third field-effect tube and the 4th
The drain electrode of effect pipe connects, and the grid of the 4th field-effect tube is connect with the discharge control terminal, the 4th field-effect tube
Source electrode connect with the safety detection end；
The grid of 5th field-effect tube is connect with the grid of the 4th field-effect tube, the source electrode of the 5th field-effect tube
It is connect with the drain electrode of the third field-effect tube, the drain electrode of the 5th field-effect tube is connect with the anode of the battery core；
The grid of 6th field-effect tube is connect with the grid of the third field-effect tube, the source electrode of the 6th field-effect tube
It is connect with the drain electrode of the third field-effect tube, the drain electrode of the 6th field-effect tube is connect with the anode of the battery core；
The grid of first field-effect tube is connect with the source electrode of the 6th field-effect tube.
6. cell measurement circuit according to claim 3, which is characterized in that described control unit include with door sub-circuit,
It is described to be connect respectively with the charge control end, the discharge control terminal with the input terminal of door sub-circuit, described and door sub-circuit
Output end connect with the grid of first field-effect tube.
7. cell measurement circuit according to claim 6, which is characterized in that described to include the 7th field-effect with door sub-circuit
Pipe and the 8th field-effect tube；
The grid of 7th field-effect tube is connect with the charge control end, the source electrode of the 7th field-effect tube and the 8th
The drain electrode of effect pipe connects, and the drain electrode of the 7th field-effect tube is connect with the anode of the battery core；
The grid of 8th field-effect tube is connect with the discharge control terminal, the source electrode of the 8th field-effect tube and the peace
Full test side connection.
8. cell measurement circuit according to claim 1, which is characterized in that the discharge prevention unit includes the 9th effect
Ying Guan, the charge protection unit include the tenth field-effect tube；
The grid of 9th field-effect tube is connect with the discharge control terminal, the source electrode and the electricity of the 9th field-effect tube
First pole of core connects, and the drain electrode of the 9th field-effect tube is connect with the source electrode of the tenth field-effect tube, and the described ten
The grid of effect pipe is connect with the charge control end, and the drain electrode of the tenth field-effect tube is connect with the safety detection end.
9. cell measurement circuit according to claim 8, which is characterized in that the discharge prevention unit further includes first continuous
Diode is flowed, the anode of first freewheeling diode is connect with the source electrode of the 9th field-effect tube, first afterflow two
The cathode of pole pipe is connect with the drain electrode of the 9th field-effect tube；
The charge protection unit further includes the second freewheeling diode, the anode of second freewheeling diode with the described ten
The drain electrode of effect pipe connects, and the cathode of second freewheeling diode is connect with the source electrode of the tenth field-effect tube.
10. a kind of electronic equipment, which is characterized in that including cell measurement circuit as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821993329.2U CN209280886U (en) | 2018-11-29 | 2018-11-29 | Cell measurement circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821993329.2U CN209280886U (en) | 2018-11-29 | 2018-11-29 | Cell measurement circuit and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN209280886U true CN209280886U (en) | 2019-08-20 |
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|---|---|---|---|
| CN201821993329.2U Active CN209280886U (en) | 2018-11-29 | 2018-11-29 | Cell measurement circuit and electronic equipment |
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| CN (1) | CN209280886U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117706261A (en) * | 2024-02-06 | 2024-03-15 | 深圳市积加创新技术有限公司 | Monitoring method for health state of constant electric product based on electricity meter |
-
2018
- 2018-11-29 CN CN201821993329.2U patent/CN209280886U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117706261A (en) * | 2024-02-06 | 2024-03-15 | 深圳市积加创新技术有限公司 | Monitoring method for health state of constant electric product based on electricity meter |
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