CN108377016A - A kind of break detection circuit, detection method and supply unit - Google Patents
A kind of break detection circuit, detection method and supply unit Download PDFInfo
- Publication number
- CN108377016A CN108377016A CN201810219628.9A CN201810219628A CN108377016A CN 108377016 A CN108377016 A CN 108377016A CN 201810219628 A CN201810219628 A CN 201810219628A CN 108377016 A CN108377016 A CN 108377016A
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- equalizer switch
- equalizer
- comparator
- switch
- detection circuit
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- 238000001514 detection method Methods 0.000 title claims abstract description 90
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 229910018502 Ni—H Inorganic materials 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000012358 sourcing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- H02J7/0026—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
Abstract
This application discloses a kind of break detection circuit, detection method and supply units, break detection circuit is applied to the equalizing circuit of battery pack, battery pack includes multiple batteries being connected in series with, equalizing circuit includes at least multiple equalizer switches, it is correspondingly arranged with multiple batteries, equalizer switch couples the both ends of battery corresponding with equalizer switch；Break detection circuit includes at least multiple comparators, is correspondingly arranged with multiple equalizer switches, and comparator couples the both ends of equalizer switch corresponding with comparator, and comparator is used to compare when equalizer switch is closed the voltage difference at the both ends of equalizer switch.By the above-mentioned means, can detect that equalizing circuit breaks according to the comparison result of comparator.
Description
Technical field
This application involves technical field of battery management, more particularly to a kind of break detection circuit, detection method and electricity
Source device.
Background technology
Burn out detection function is needed in li-ion cell protection system, it is ensured that battery status is in monitoring, right in the prior art
In multi-series lithium battery application, generally require with equalization function.In traditional scheme, in order to ensure low-power consumption, the battery-end of broken string
The process time of sub- sourcing current is longer, in the process can flip chip equalization function, lead to not correctly detect broken string.For
The influence for avoiding equalization function, shortens the burn out detection time, and can cause chip actual power loss according to high current
Increase, therefore traditional method can not detect broken string in equalizing circuit.
Invention content
The application mainly solving the technical problems that provide a kind of break detection circuit, detection method and supply unit,
Can solve the problems, such as it is existing can not detect equalizing circuit break.
In order to solve the above technical problems, the technical solution that the application uses is：A kind of break detection circuit is provided, is broken
Line detection circuit is applied to the equalizing circuit of battery pack, and battery pack includes multiple batteries being connected in series with, and equalizing circuit at least wraps
Multiple equalizer switches are included, are correspondingly arranged with multiple batteries, equalizer switch couples the both ends of battery corresponding with equalizer switch；Broken string
Detection circuit includes at least multiple comparators, is correspondingly arranged with multiple equalizer switches, and comparator coupling is corresponding with comparator
It weighs the both ends of switch, comparator is used to compare when equalizer switch is closed the voltage difference at the both ends of equalizer switch, with according to comparing
The comparison result of device detects that equalizing circuit breaks.
In order to solve the above technical problems, another technical solution that the application uses is：A kind of detection method is provided, the inspection
Survey method is applied to the equalizing circuit of battery pack, and battery pack includes multiple batteries being connected in series with, and equalizing circuit includes：It is multiple equal
Weighing apparatus switch, is correspondingly arranged with multiple batteries, and equalizer switch couples the both ends of battery corresponding with equalizer switch；Break detection circuit
It includes at least：Multiple comparators are correspondingly arranged with multiple equalizer switches, and comparator couples equalizer switch corresponding with comparator
Both ends；When detection method is included in equalizer switch closure, the voltage difference at the both ends of equalizer switch is compared by comparing device；If comparing
The comparison result of device is that the voltage difference at the both ends of equalizer switch is less than or equal to preset threshold value, then is examined by break detection circuit
Equalizing circuit broken string is measured, and disconnects equalizer switch corresponding with comparator.
In order to solve the above technical problems, another technical solution that the application uses is：A kind of supply unit is provided, the electricity
Source device includes the break detection circuit described in any one of said program.
The advantageous effect of the application is：The case where being different from the prior art, the application provide a kind of break detection circuit, break
Line detection circuit is applied to the equalizing circuit of battery pack, and battery pack includes multiple batteries being connected in series with, and equalizing circuit at least wraps
Multiple equalizer switches are included, are correspondingly arranged with multiple batteries, equalizer switch couples the both ends of battery corresponding with equalizer switch；Broken string
Detection circuit includes at least multiple comparators, is correspondingly arranged with multiple equalizer switches, and comparator coupling is corresponding with comparator
It weighs the both ends of switch, comparator is used to compare when equalizer switch is closed the voltage difference at the both ends of equalizer switch, with according to comparing
The comparison result of device detects that equalizing circuit breaks, therefore can detect whether to break in equalizing circuit.
Description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of application for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of electrical block diagram of one embodiment of break detection circuit of the application；
Fig. 2 is a kind of electrical block diagram of another embodiment of break detection circuit of the application；
Fig. 3 is a kind of flow diagram of one embodiment of detection method of the application；
Fig. 4 is a kind of structural schematic diagram of one embodiment of supply unit of the application.
Specific implementation mode
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation describes.It is understood that specific embodiment described herein is only used for explaining the application, rather than the limit to the application
It is fixed.It also should be noted that illustrating only for ease of description, in attached drawing and the relevant part of the application and not all knot
Structure.Based on the embodiment in the application, those of ordinary skill in the art are obtained without creative efforts
Every other embodiment, shall fall in the protection scope of this application.
Term " comprising " and " having " in the application and their any deformations, it is intended that cover non-exclusive packet
Contain.Such as it contains process, method, system, product or the equipment of series of steps or unit and is not limited to the step listed
Rapid or unit, but further include the steps that optionally not listing or unit, or further include optionally for these processes, side
The intrinsic other steps of method, product or equipment or unit.
Referenced herein " embodiment " is it is meant that a particular feature, structure, or characteristic described can wrap in conjunction with the embodiments
It is contained at least one embodiment of the application.Each position in the description occur the phrase might not each mean it is identical
Embodiment, nor the independent or alternative embodiment with other embodiments mutual exclusion.Those skilled in the art explicitly and
Implicitly understand, embodiment described herein can be combined with other embodiments.
Referring to Fig. 1, Fig. 1 is a kind of electrical block diagram of one embodiment of break detection circuit of the application.This implementation
The revealed break detection circuit 100 of example is applied to the equalizing circuit 200 of battery pack 210, and battery pack 210 connects including multiple series connection
The battery 211 connect, equalizing circuit 200 include at least multiple equalizer switches 220, and break detection circuit 100 includes at least multiple ratios
Compared with device 110.
Wherein, the type of battery 211 can be ickel-cadmium cell, Ni-H cell, lithium battery etc. in battery pack 210, specifically
It does not limit, is illustrated by taking lithium battery as an example in the present embodiment.Equalizing circuit 200 is used for battery 211 in battery pack 210
Electricity carry out it is balanced, i.e., by controlling the open and close of equalizer switch 220 come the electricity of balancing battery 211.
Equilibrium is carried out to battery pack 210 by equalizing circuit 200 in the application, wherein equalizing circuit 200 include at least with
Multiple equalizer switches 220 that multiple batteries 211 being connected in series with are correspondingly arranged in battery pack 210, equalizer switch 220 be coupled in
The both ends of 220 corresponding battery 211 of equalizer switch, i.e. equalizer switch 220 are arranged in parallel in battery corresponding with equalizer switch 220
On 211, battery corresponding with equalizer switch 220 211 is controlled by controlling unlatching and the closure of multiple equalizer switches 220
It is balanced.
Break detection circuit 100 includes at least the multiple comparators 110 being correspondingly arranged with multiple equalizer switches 220, compares
Device 110 couples the both ends of corresponding with comparator 110 equalizer switch 220, i.e., comparator 110 be equally also coupled to equalizer switch
The both ends of 220 corresponding batteries 211, therefore, comparator 110 can be used for comparing equalizer switch when equalizer switch 220 is closed
The voltage difference at 220 both ends, to compare battery corresponding with equalizer switch 220 211 both ends voltage difference, with according to comparing
The comparison result of device 110 detects equalizing circuit 200 with the presence or absence of broken string.
Comparator 110 plays the role of monitoring, i.e. comparator 110 according to certain rules in break detection circuit 100 in
Compare the voltage difference at 220 both ends of equalizer switch, such as compared the voltage difference at 220 both ends of equalizer switch every 3 seconds, or is every
The voltage difference for comparing 220 both ends of equalizer switch every 10 seconds, does not limit herein.When equalizer switch 220 is closed, comparator
110 comparison result is that the voltage difference at the both ends of equalizer switch 220 is less than or equal to preset threshold value, at this time break detection circuit
100 detect to break in equalizing circuit 200, and disconnect equalizer switch corresponding with comparator 110 220.
It is illustrated by taking A points, B points as an example below：It is balanced to ensure when B points appearance 230 (being represented by dotted lines in figure) of broken string
The equilibrium of electricity in circuit 200, the equalizer switch 221 between A points, B points are closed, and A points, the voltage value of B points are close at this time, balanced
221 corresponding comparator 111 of switch compares the voltage difference between A points, B points, the ratio of 221 corresponding comparator 111 of equalizer switch
When relatively result is that the voltage difference at the both ends of equalizer switch 221 is less than or equal to preset threshold value, break detection circuit 100 detects
A points or B points in equalizing circuit 200 break, and disconnect equalizer switch corresponding with comparator 111 221.
The advantageous effect of the application is：The case where being different from the prior art, the application provide a kind of break detection circuit
100, break detection circuit 100 is applied to the equalizing circuit 200 of battery pack 210, and battery pack 210 includes multiple electricity being connected in series with
Pond 211, equalizing circuit 200 include at least multiple equalizer switches 220, are correspondingly arranged with multiple batteries 211,220 coupling of equalizer switch
The both ends for connecing battery corresponding with equalizer switch 220 211, with control and the balanced shape of 220 corresponding battery 211 of equalizer switch
State；Break detection circuit 100 includes at least the multiple comparators 110 being correspondingly arranged with multiple equalizer switches 220, comparator 110
The both ends of equalizer switch corresponding with comparator 110 220 are coupled, comparator 110 is for more equal when equalizer switch 220 is closed
Weigh switch 220 both ends voltage difference, to compare battery corresponding with equalizer switch 220 211 both ends voltage difference, with root
Equalizing circuit 200 is detected with the presence or absence of broken string according to the comparison result of comparator 110, i.e. the comparison result of comparator 110 is equal
The voltage difference at the both ends of weighing apparatus switch 220 is less than or equal to preset threshold value, and break detection circuit 100 detects equalizing circuit at this time
Break in 200, and disconnects equalizer switch corresponding with comparator 110 220.
The above embodiment can detect that equalizing circuit 200 breaks, but not can determine that it is where to break, therefore
On the basis of the above embodiments, the application proposes a kind of another embodiment of break detection circuit 100, is capable of detecting when equilibrium
The broken string where circuit 200 occurs is a kind of 100 another embodiment of break detection circuit of the application referring specifically to Fig. 2, Fig. 2
Electrical block diagram.The revealed break detection circuit 100 of the present embodiment is applied to the equalizing circuit 200 of battery pack 210,
Battery pack 210 includes multiple batteries 211 being connected in series with, and equalizing circuit 200 includes at least multiple equalizer switches 220, broken string inspection
Slowdown monitoring circuit 100 includes at least multiple comparators 110.
When equalizer switch 210 is closed, comparator 110 compares the voltage difference at the both ends of equalizer switch 210, comparator 110
Comparison result be equalizer switch 220 both ends voltage difference be more than preset threshold value, can determine whether out the equal of battery pack 210 at this time
Weighing apparatus circuit 200 does not occur broken string, then equalizer switch 220 remains closed, and equalizing circuit 200 works normally.It is with A points, B points
Example illustrates, if 211 corresponding equalizer switch 221 of battery is closed, comparator 111 compares the ends A of equalizer switch 221
The voltage of point, B points, voltage difference of the comparison result between A points, B points are more than preset threshold value, judge battery pack 210 at this time
Equalizing circuit 200 do not occur broken string, then equalizer switch 221 remains closed.
Correspondingly, when equalizer switch 220 is closed, the voltage at the both ends of equalizer switch 220 is compared by comparing device 110
Difference is led to if the voltage difference that the comparison result of comparator 110 is the both ends of equalizer switch 220 is less than or equal to preset threshold value
It crosses break detection circuit 100 and detects that equalizing circuit 200 breaks, and disconnect equalizer switch 220 corresponding with comparator 110,
Equalizing circuit 200 is detected by break detection circuit 100 after suspending equalization function.
Break detection circuit 100 can also include multiple pull-down circuits 120, one end connection drop-down electricity of equalizer switch 220
Road 120, i.e., multiple batteries 211 being connected in series with are correspondingly arranged multiple pull-down circuits 120.It is corresponding with comparator 110 disconnecting
After equalizer switch 220, pull-down circuit 120 is used to pull down the terminal voltage of equalizer switch 220, and pull-down circuit 120 includes constant-current source
130, one end of constant-current source 130 is connect with one end of equalizer switch 220, the other end ground connection of constant-current source 130, pull-down circuit 120
The terminal voltage of equalizer switch 220 can also be pulled down by other means, such as pull-down circuit 120 includes pull down resistor or constant pressure
Source.
For existing multiple lithium battery applications being connected in series with equalization function, in traditional scheme, detection chip
For power consumption generally in 10~20uA, the input current of battery terminal is generally less than 0.5u μ A, the filter capacitor one outside battery terminal
As be 0.1uF, using the electric current of 100nA or so, if the voltage of one batteries 4V of variation, in order to ensure the low work(of detection chip
Consumption, the process of the battery terminal pull-down current of broken string substantially need 4s, and the time is longer, can trigger equalization function in the process,
Lead to not detect broken string in equalizing circuit, and the break detection circuit 100 in the application is under the premise of ensureing low-power consumption,
Multiple equalizer switches 220 are accordingly provided with, it is equal to close to disconnect corresponding equalizer switch 220 according to demand in burn out detection
Weigh function, and to avoid balanced influence, therefore the broken string of the lithium battery protection circuit with equalization function is examined in the present embodiment
Survey can be widely used in battery management, Industry Control, communication, consumer electronics etc., real for the chip-scale of these applications
Now especially it is of great significance.
Multiple equalizer switches 220 may include odd number equalizer switch and even number equalizer switch, odd number equalizer switch and even number
Equalizer switch is closed in turn to realize the equilibrium of equalizing circuit 200.In the present embodiment, equalizing circuit 200 can there are many real
Existing mode, ensures that two neighboring equalizer switch 220 is not closed at, for example, parity channel is balanced, when multiple equalizer switches
220 when including odd number equalizer switch and even number equalizer switch, and odd number equalizer switch and even number equalizer switch are closed in turn to realize
The equilibrium of equalizing circuit 200；It is balanced in turn, it, can be according to certain if there are several batteries 211 being connected in series with to need equilibrium
Sequence is separately turned on equalizer switch 220 successively.Wherein, metal-oxide-semiconductor, the realization side of equalizer switch 220 may be used in equalizer switch 220
Formula does not limit specifically.
In the present embodiment, break detection circuit 100 both can open equilibrium in the equalizing circuit 200 of battery pack 210
It is detected, can also be detected in non-balanced state when state.
When equalizer switch 220 disconnects, the comparison result of comparator 110 is that the voltage difference at the both ends of equalizer switch 220 is big
In preset threshold value, then it is closed equalizer switch 220, releases broken string state at this time.
It is illustrated by taking A points, B points, C points as an example below：When adjacent battery 211, battery 212 are at equilibrium simultaneously
When, and battery 211,212 corresponding equalizer switch 221 of battery are in closed state with equalizer switch 222, when B points break
Line 230, then the pull-down circuit 121 of B points can be by the voltage of B points with being pulled down to, i.e. the voltage value of B points is 0V, and the voltage value of A points
It is naturally larger than 0V, therefore the voltage difference of A points and B points becomes larger, to which equalizing circuit 200 can determine whether out that equalizer switch 221 is corresponding
Battery 211 needs to carry out balanced.Due to breaking at B points, the voltage of B points can be pulled to and A points by equalizer switch 221 when balanced
Voltage is close, may determine that with the presence or absence of broken string, i.e. equalizer switch 221 corresponds to by detecting the voltage difference between A points and B points
Comparator 111 comparison result be 221 both ends of equalizer switch A points and B points between voltage difference be less than or equal to it is preset
When threshold value, then break detection circuit 100 detects that equalizing circuit 200 breaks.After equilibrium state, equalizer switch 221 with
Equalizer switch 222 disconnects, and the voltage of B points can be pulled down to ground by the pull-down circuit 121 of B points, i.e. the voltage value of B points is 0V, and phase
The voltage value of adjacent C points is naturally larger than 0V, and detecting the voltage difference between B points and C points by comparing device 112 can be confirmed that B points exist
Broken string.230 after connect at the broken string of B points, and the comparison result of 221 corresponding comparator 111 of equalizer switch is equalizer switch
The voltage difference at 221 both ends is more than preset threshold value, then is closed equalizer switch 221, releases broken string state.
The advantageous effect of the application is：The case where being different from the prior art, the application provide a kind of break detection circuit
100, break detection circuit 100 is applied to the equalizing circuit 200 of battery pack 210, and battery pack 210 includes multiple electricity being connected in series with
Pond 211, equalizing circuit 200 include at least multiple equalizer switches 220, are correspondingly arranged with multiple batteries 211,220 coupling of equalizer switch
The both ends for connecing battery corresponding with equalizer switch 220 211, with control and the balanced shape of 220 corresponding battery 211 of equalizer switch
State；Break detection circuit 100 includes at least the multiple comparators 110 being correspondingly arranged with multiple equalizer switches 220, comparator 110
The both ends of equalizer switch corresponding with comparator 110 220 are coupled, break detection circuit 100 can also include multiple pull-down circuits
120, pull-down circuit 120 is used to pull down the terminal voltage of equalizer switch 220, to increase the voltage difference at 220 both ends of equalizer switch, than
The voltage difference at the both ends compared with device 110 for comparing equalizer switch 220 when equalizer switch 220 is closed, is opened to compare with balanced
The voltage difference for closing the both ends of 220 corresponding batteries 211, to detect that equalizing circuit 200 is disconnected according to the comparison result of comparator 110
Line leads to if the voltage difference that the comparison result of comparator 110 is the both ends of equalizer switch 220 is less than or equal to preset threshold value
It crosses break detection circuit 100 and detects that equalizing circuit 200 breaks.
Corresponding to the above embodiment, the application proposes a kind of detection method, is the application one referring specifically to Fig. 3, Fig. 3
The flow diagram of kind one embodiment of detection method.The revealed detection method of the present embodiment is applied to the equilibrium electricity of battery pack
Road, battery pack include multiple batteries being connected in series with, and equalizing circuit includes multiple equalizer switches, is correspondingly arranged with multiple batteries,
Equalizer switch couples the both ends of battery corresponding with equalizer switch；Break detection circuit includes at least multiple comparators, and multiple
Equalizer switch is correspondingly arranged, and comparator couples the both ends of equalizer switch corresponding with comparator；Particular circuit configurations schematic diagram can
Refering to fig. 1 or Fig. 2, the specific implementation mode of circuit is similar with said program, is not repeated herein.The present embodiment is revealed
Detection method may include following steps：
S11：When equalizer switch is closed, the voltage difference at the both ends of equalizer switch is compared by comparing device.
When equalizer switch is closed, comparator compares the voltage difference at the both ends of equalizer switch, and comparator is in burn out detection electricity
Lu Zhong plays the role of monitoring, i.e. comparator compares the voltage difference at equalizer switch both ends according to certain rules, according to comparator
Comparison result detect whether equalizing circuit breaks, if the comparison result of comparator be equalizer switch both ends voltage difference it is big
In preset threshold value, it can determine whether out that the equalizing circuit of battery pack does not occur broken string at this time, then equalizer switch remains closed；If
The comparison result of comparator is that the voltage difference at the both ends of equalizer switch is less than or equal to preset threshold value, then executes following step
S12。
S12：If the voltage difference that the comparison result of comparator is the both ends of equalizer switch is less than or equal to preset threshold value,
It detects that equalizing circuit breaks by break detection circuit, and disconnects equalizer switch corresponding with comparator.
If the voltage difference that the comparison result of comparator is the both ends of equalizer switch is less than or equal to preset threshold value, pass through
Break detection circuit detects that equalizing circuit breaks, and disconnects equalizer switch corresponding with comparator, that is, suspends equalization function
Equalizing circuit is detected by break detection circuit afterwards.
Detection method specific implementation mode in the present embodiment is similar with said program, is not repeated herein.
The advantageous effect of the application is：The case where being different from the prior art, the application provide a kind of detection method, the detection
Method is applied to the equalizing circuit of battery pack, and battery pack includes multiple batteries being connected in series with, and equalizing circuit includes and multiple electricity
Multiple equalizer switches that pond is correspondingly arranged, equalizer switch couple the both ends of battery corresponding with equalizer switch；Break detection circuit
Including at least the multiple comparators being correspondingly arranged with multiple equalizer switches, comparator couples equalizer switch corresponding with comparator
Both ends；The detection method by the way that when equalizer switch is closed, the voltage difference at the both ends of equalizer switch is compared by comparing device, if than
Voltage difference compared with the both ends that the comparison result of device is equalizer switch is less than or equal to preset threshold value, then passes through break detection circuit
It detects that equalizing circuit breaks, and disconnects equalizer switch corresponding with comparator, can be examined according to the comparison result of comparator
Measure equalizing circuit broken string.
The application proposes a kind of supply unit, is a kind of one embodiment of supply unit of the application referring specifically to Fig. 4, Fig. 4
Structural schematic diagram, the revealed supply unit of the present embodiment 300 may include described in any one of the above embodiment
Break detection circuit 100, does not repeat specifically.
The advantageous effect of the application is：The case where being different from the prior art, supply unit 300 provided by the present application being capable of root
Detect that equalizing circuit breaks according to the comparison result of comparator.
The foregoing is merely presently filed embodiments, are not intended to limit the scope of the claims of the application, every to utilize this
Equivalent structure or equivalent flow shift made by application specification and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field includes similarly in the scope of patent protection of the application.
Claims (10)
1. a kind of break detection circuit, which is characterized in that the break detection circuit is applied to the equalizing circuit of battery pack, described
Battery pack includes multiple batteries being connected in series with, and the equalizing circuit includes at least：
Multiple equalizer switches are correspondingly arranged with the multiple battery, and the equalizer switch coupling is corresponding with the equalizer switch
The both ends of battery；
The break detection circuit includes at least：
Multiple comparators are correspondingly arranged with the multiple equalizer switch, and the comparator coupling is corresponding with the comparator
The both ends of weighing apparatus switch, voltage of the comparator for the both ends of the equalizer switch when the equalizer switch is closed
Difference, to detect that the equalizing circuit breaks according to the comparison result of the comparator.
2. break detection circuit according to claim 1, which is characterized in that when the equalizer switch is closed, the ratio
Voltage difference compared with the both ends that the comparison result of device is the equalizer switch is less than or equal to preset threshold value, then the burn out detection
Circuit detects the equalizing circuit broken string, and disconnects equalizer switch corresponding with the comparator.
3. break detection circuit according to claim 2, which is characterized in that when the equalizer switch is closed, the ratio
Voltage difference compared with the both ends that the comparison result of device is the equalizer switch is more than the preset threshold value, then the equalizer switch is protected
Hold closure, the equalizing circuit normal work.
4. break detection circuit according to claim 2, which is characterized in that under the break detection circuit further includes multiple
One end of puller circuit, the equalizer switch connects the pull-down circuit.
5. break detection circuit according to claim 4, which is characterized in that corresponding balanced with the comparator disconnecting
After switch, the pull-down circuit is used to pull down the terminal voltage of the equalizer switch.
6. break detection circuit according to claim 4, which is characterized in that the pull-down circuit includes constant-current source, described
One end of constant-current source is connect with one end of the equalizer switch, the other end ground connection of the constant-current source.
7. break detection circuit according to claim 1, which is characterized in that the multiple equalizer switch includes odd number equilibrium
Switch and even number equalizer switch, the odd number equalizer switch and the even number equalizer switch are closed in turn.
8. break detection circuit according to claim 1, which is characterized in that when the equalizer switch disconnects, the ratio
Voltage difference compared with the both ends that the comparison result of device is the equalizer switch is more than the preset threshold value, then is closed the equilibrium and opens
It closes.
9. a kind of detection method, which is characterized in that the detection method is applied to the equalizing circuit of battery pack, the battery pack packet
Multiple batteries being connected in series with are included, the equalizing circuit includes：Multiple equalizer switches are correspondingly arranged with the multiple battery, institute
State the both ends that equalizer switch couples battery corresponding with the equalizer switch；Break detection circuit includes at least：Multiple comparators,
It is correspondingly arranged with the multiple equalizer switch, the comparator couples the both ends of equalizer switch corresponding with the comparator；Institute
Stating detection method includes：
When the equalizer switch is closed, pass through the voltage difference at the both ends of the comparator equalizer switch；
If the voltage difference that the comparison result of the comparator is the both ends of the equalizer switch is less than or equal to preset threshold value,
Equalizing circuit broken string is detected by the break detection circuit, and disconnects balanced open corresponding with the comparator
It closes.
10. a kind of supply unit, which is characterized in that include the break detection circuit as described in claim 1-8 any one.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810219628.9A CN108377016A (en) | 2018-03-16 | 2018-03-16 | A kind of break detection circuit, detection method and supply unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810219628.9A CN108377016A (en) | 2018-03-16 | 2018-03-16 | A kind of break detection circuit, detection method and supply unit |
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| CN108377016A true CN108377016A (en) | 2018-08-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109445375A (en) * | 2018-12-28 | 2019-03-08 | 中电智能科技有限公司 | PLC redundant system and PLC redundancy approach |
| CN112147517A (en) * | 2019-06-26 | 2020-12-29 | 比亚迪股份有限公司 | Battery pack detection device and system |
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