CN110095646A - Detection of negative pressure circuit and battery protecting circuit - Google Patents
Detection of negative pressure circuit and battery protecting circuit Download PDFInfo
- Publication number
- CN110095646A CN110095646A CN201910333884.5A CN201910333884A CN110095646A CN 110095646 A CN110095646 A CN 110095646A CN 201910333884 A CN201910333884 A CN 201910333884A CN 110095646 A CN110095646 A CN 110095646A
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- Prior art keywords
- switch
- node
- voltage
- detection
- reference voltage
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a kind of detection of negative pressure circuit and battery protecting circuit, detection of negative pressure circuit includes: detection voltage end, receives detection voltage；Reference voltage end, receives reference voltage, and the reference voltage is positive voltage；It is connected to first node and detects the third switch between voltage end；The second switch being connected between first node and ground terminal；The first capacitor being connected between first node and second node；The first switch being connected between second node and reference voltage end；Comparator, it includes the first input end connecting with second node, the second input terminal connecting with ground terminal, and the output end of output comparison result, the first period in one cycle, first switch and the second switch conducting, third switch disconnect, the second period in one cycle, first switch and the second switch disconnects, third switch conduction.Compared with prior art, the detection of negative pressure circuit in the present invention can be realized the comparison of negative voltage, and circuit is realized simple.
Description
[technical field]
The present invention relates to circuit design field more particularly to a kind of detection of negative pressure circuits and battery protecting circuit.
[background technique]
Battery protecting circuit is typically installed in battery, for example, having the printing electricity of one piece of very little in mobile phone cell inner
Road plate (Printed Circuit Board, abbreviation PCB), battery protecting circuit is just installed on this printed circuit board.Battery is protected
Protection circuit is used to carry out charge and discharge control to battery, and basic function includes overvoltage charge protection, overvoltage discharge prevention, puts
Electric overcurrent protection, charging overcurrent protection and short-circuit protection.
It please refers to shown in Fig. 1, for the circuit diagram of battery protecting circuit in the prior art.The battery protecting circuit
Including battery protection chip (or battery protection unit) 110, switch combination circuit 120, resistance R1, resistance R2 and capacitor C11.
The anode of the first power end VP and battery core Bat of the battery protecting circuit is connected directly, the battery protection electricity
The second source end VM on road is connected by switch combination circuit 120 with the cathode G of battery core Bat, and resistance R1 and capacitor C11 are series at
Between the anode and cathode G of battery core Bat.When load resistance R0 is connected between the first power end VP and second source end VM,
The battery core Bat is in discharge condition；When battery charger 130 is just being connected between the first power end VP and second source end VM
When, the battery core Bat is in charged state.
The switch combination circuit 120 includes the first NMOS (N-Channel Metal Oxide Semiconductor)
Transistor MN1 and the second NMOS transistor MN2.The source electrode of the first NMOS transistor MN1 and the cathode G of the battery core Bat
It is connected, drain electrode is connected with the drain electrode of the second NMOS transistor MN2, the source electrode of the second NMOS transistor MN2 and institute
It states second source end VM to be connected, and parasitism has diode (not shown) in NMOS transistor MN1, in NMOS transistor MN2
Parasitism has diode (not shown).
The battery protection chip 110 includes three connecting pins (or being test side) and two control terminals.Three connections
End is respectively the first test side (or the battery core anode connection terminal) VDD being connected with battery core BAT anode and battery core BAT cathode G phase
The second test side (or ground terminal) VSS even and third test side VMI being connected with second source end VM, two control terminals point
It Wei not charge control end CO1 and discharge control terminal DO1.Wherein, the connection section between connecting pin VDD and resistance R1 and capacitor C11
Point is connected, and connecting pin VSS is connected with the cathode G of battery core Bat, and connecting pin VMI is connected by resistance R2 with second source end VM, fills
Electric control end CO1 is connected with the grid of NMOS transistor MN2, and discharge control terminal DO1 is connected with the grid of NMOS transistor MN1.
Refering to what is shown in Fig. 1, the battery protection chip 110 includes overcharging power detection circuit 112, over-discharge power detection circuit
114, electric discharge over-current detection circuit (not shown), charging over-current detection circuit 116, short-circuit detecting circuit 117 and control circuit
118.The control circuit 118 overcharges power detection circuit 112, over-discharge power detection circuit 114, electric discharge over-current detection electricity according to described
The detection signal that road, charging over-current detection circuit 116 and short-circuit detecting circuit 117 export generates charging control signal and by filling
CO1 output in electric control end generates discharge control signal and is exported by discharge control terminal DO1.Specifically, working as battery protection chip
110 detect that the voltage of battery core Bat is more than over-voltage charge threshold (for example, 4.3V), and the duration is greater than and overcharges guard delay
Time (such as 100mS) is then low level by the charging control signal CO1 that control circuit 118 exports, makes NMOS transistor
MN2 shutdown is forbidden charging to cut off the charge circuit of battery core Bat to realize；When battery protection chip 110 detects battery core
The voltage of Bat is lower than over-voltage discharge threshold (such as 2.3V), and the duration is greater than Cross prevention delay time (such as 40mS),
It is then low level by the discharge control signal DO1 that control circuit 118 exports, turns off NMOS transistor MN2, to cut off battery core
The discharge loop of Bat is forbidden discharging to realize；When battery protection chip 110 detects that the voltage of second source end VM is higher than
It discharges overcurrent threshold value (such as 150mV), and the duration is greater than overcurrent discharge prevention delay time (such as 12mS), then passes through control
The discharge control signal DO1 that circuit 118 processed exports is low level, turns off NMOS transistor MN2, forbids discharging to realize；
When battery protection chip 110 detects that the voltage of second source end VM is higher than short-circuit protection threshold value (such as 1V), and duration
Greater than short-circuit protection delay time (such as 2~80uS), then it is low level by the signal DO1 that control circuit 118 exports, makes
NMOS transistor MN2 shutdown, forbids discharging to realize.
When battery protection chip 110 detects the voltage of second source end VM, lower than charging overcurrent protection threshold value, (one negative
Value), and when the duration is greater than a period of time, then the signal CO1 exported by control circuit 118 is low level, keeps NMOS brilliant
Body pipe MN1 shutdown, forbids charging to realize.However, due to the overcurrent protection threshold value that charges, current charging over-current detection circuit
116 realizations are complex.
Therefore, it is necessary to propose a solution to solve the above problems.
[summary of the invention]
The technical problem to be solved in the present invention is that providing a kind of detection of negative pressure circuit and battery protecting circuit, circuit is real
It is now simple, it can be realized the comparison of negative voltage.
To solve the above-mentioned problems, according to an aspect of the present invention, the present invention provides a kind of detection of negative pressure circuit,
Include: detection voltage end, receives detection voltage；Reference voltage end, receives reference voltage, and the reference voltage is positive electricity
Pressure；It is connected to first node and detects the third switch between voltage end；Second be connected between first node and ground terminal
Switch；The first capacitor being connected between first node and second node；It is connected between second node and reference voltage end
First switch；Comparator comprising the first input end being connect with second node, the second input terminal being connect with ground terminal, with
And the output end of output comparison result, the first period in one cycle, first switch and the second switch conducting, third switch
It disconnects, the second period in one cycle, first switch and the second switch disconnects, third switch conduction.
Further, when the comparison result is the first logic level, indicate that detection voltage is less than the negative reference
Voltage-Vref indicates that detection voltage is greater than the negative reference voltage-when the comparison result is the second logic level
Vref。
According to another aspect of the present invention, the present invention provides a kind of battery protecting circuits comprising: the first power supply
End；Second source end；It is connected between the switch combination circuit between the cathode of battery core and second source end；Charging overcurrent protection
Circuit comprising: the detection voltage end being connected with the second source end receives detection voltage；Reference voltage end receives
Reference voltage, the reference voltage are positive voltage；It is connected to first node and detects the third switch between voltage end；It is connected to
Second switch between first node and ground terminal；The first capacitor being connected between first node and second node；It is connected to
First switch between second node and reference voltage end；Comparator comprising the first input end that is connect with second node, with
Second input terminal of ground terminal connection, and the output end of output comparison result, the first period in one cycle, first opens
It closes and second switch conducting, third switch disconnects, the second period in one cycle, first switch and the second switch disconnects,
Third switch conduction, the comparison result of device output controls the switch combination circuit based on the comparison.
Further, when the comparison result is the first logic level, indicate that detection voltage is less than the negative reference
Voltage-Vref indicates that detection voltage is greater than the negative reference voltage-when the comparison result is the second logic level
Vref。
Compared with prior art, the detection of negative pressure circuit in the present invention can be realized the comparison of negative voltage, and circuit realizes letter
It is single.
About other objects of the present invention, feature and advantage are detailed in a specific embodiment below in conjunction with attached drawing
Description.
[Detailed description of the invention]
It will be better understood in conjunction with reference attached drawing and next detailed description, the present invention, wherein same appended drawing reference
Corresponding same structure member, in which:
Fig. 1 is the circuit diagram of battery protecting circuit in one embodiment in the present invention；
Fig. 2 is the circuit diagram of detection of negative pressure circuit in one embodiment in the present invention.
[specific embodiment]
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
" one embodiment " or " embodiment " referred to herein refer to special characteristic relevant to the embodiment, structure or
Characteristic at least may be included at least one implementation of the invention.In the present specification different places occur " in a reality
Apply in example " not necessarily all refer to the same embodiment, it is also necessarily that the independent or selection mutually exclusive with other embodiments is real
Apply example." multiple ", " several " in the present invention indicate two or more."and/or" in the present invention indicate "and" or
"or".
The present invention proposes a kind of detection of negative pressure circuit, which can realize that negative pressure is examined with simple circuit
It surveys.
Fig. 2 is the circuit diagram of detection of negative pressure circuit 200 in one embodiment in the present invention.As shown in Figure 2,
The detection of negative pressure circuit 200 includes: detection voltage end A, receives detection voltage VM；Reference voltage end C is received with reference to electricity
Pressing VREF, the reference voltage VREF is positive voltage；It is connected to first node B and detects the third switch W3 between voltage end A；
The second switch W2 being connected between first node B and ground terminal G；First be connected between first node B and second node D
Capacitor C1；The first switch W1 being connected between second node D and reference voltage end C；Comparator (not shown).
The second input terminal that the comparator includes the first input end connecting with second node D, is connect with ground terminal G,
And the output end of output comparison result.
The first period Φ 1, first switch W1 and second switch W2 conducting in one cycle, third switch W3 are disconnected,
Reference voltage VREF charges to capacitor C1 at this time, until the voltage of capacitor C1 is equal to the reference voltage VREF, wherein first segment
The voltage VO=VREF, VREF of the voltage VB=0 of point B, second node D are the voltage value of reference voltage VREF.
The second period Φ 2, first switch W1 and second switch W2 in one cycle is disconnected, third switch W3 conducting,
Detection voltage end A is connected by third switch W3 with first node B, wherein the voltage VB=VM of first node B, second node D
Voltage VO=VM+VREF, VREF is the voltage value of reference voltage VREF, and VM be the detection voltage that detection voltage end A is received
The voltage value of VM.The voltage VO of second node D and 0 level are compared by the comparator, are come by comparing the size of VO and 0
Judgement, the size between VM and-VREF.When VO is less than 0, show VM be less than-VREF, VO be greater than 0 when, show VM be greater than-
VREF.Specifically, indicating that detection voltage is less than the negative reference voltage-when the comparison result is the first logic level
Vref indicates that detection voltage is greater than the negative reference voltage-Vref when the comparison result is the second logic level.
As it can be seen that the present invention can realize the detection of negative pressure by simple circuit.According to an aspect of the present invention, originally
Detection of negative pressure circuit 200 in invention may be used as the charging over-current detection circuit 116 in battery protecting circuit, at this time detection electricity
Pressure side A is connected with the second source end VM.When comparator discovery VO is less than 0 and the duration is greater than a period of time,
Think charging overcurrent occur, be then low level by the signal CO1 that control circuit 118 exports, turn off NMOS transistor MN1,
Forbid charging to realize.
In the present invention, the word that the expressions such as " connection ", connected, " company ", " connecing " are electrical connected, unless otherwise instructed, then
Indicate direct or indirect electric connection.
Above description sufficiently discloses a specific embodiment of the invention.It should be pointed out that being familiar with the field
Range of any change that technical staff does a specific embodiment of the invention all without departing from claims of the present invention.
Correspondingly, the scope of the claims of the invention is also not limited only to previous embodiment.
Claims (4)
1. a kind of detection of negative pressure circuit, characterized in that it comprises:
Voltage end is detected, detection voltage is received；
Reference voltage end, receives reference voltage, and the reference voltage is positive voltage；
It is connected to first node and detects the third switch between voltage end；
The second switch being connected between first node and ground terminal；
The first capacitor being connected between first node and second node；
The first switch being connected between second node and reference voltage end；
Comparator comprising the first input end being connect with second node, the second input terminal being connect with ground terminal, and output
The output end of comparison result,
The first period in one cycle, first switch and the second switch conducting, third switch disconnect, in one cycle
Second period, first switch and the second switch disconnect, third switch conduction.
2. detection of negative pressure circuit according to claim 1, which is characterized in that
When the comparison result is the first logic level, indicate that detection voltage is less than the negative reference voltage-Vref, in institute
When to state comparison result be the second logic level, indicate that detection voltage is greater than the negative reference voltage-Vref.
3. a kind of battery protecting circuit, characterized in that it comprises:
First power end；
Second source end；
It is connected between the switch combination circuit between the cathode of battery core and second source end；
Charge current foldback circuit comprising:
The detection voltage end being connected with the second source end receives detection voltage；
Reference voltage end, receives reference voltage, and the reference voltage is positive voltage；
It is connected to first node and detects the third switch between voltage end；
The second switch being connected between first node and ground terminal；
The first capacitor being connected between first node and second node；
The first switch being connected between second node and reference voltage end；
Comparator comprising the first input end being connect with second node, the second input terminal being connect with ground terminal, and output
The output end of comparison result,
The first period in one cycle, first switch and the second switch conducting, third switch disconnect, in one cycle
Second period, first switch and the second switch disconnect, third switch conduction, based on the comparison the comparison result control of device output
The switch combination circuit.
4. battery protecting circuit according to claim 3, which is characterized in that
When the comparison result is the first logic level, indicate that detection voltage is less than the negative reference voltage-Vref, in institute
When to state comparison result be the second logic level, indicate that detection voltage is greater than the negative reference voltage-Vref.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910333884.5A CN110095646B (en) | 2019-04-24 | 2019-04-24 | Negative pressure detection circuit and battery protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910333884.5A CN110095646B (en) | 2019-04-24 | 2019-04-24 | Negative pressure detection circuit and battery protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN110095646A true CN110095646A (en) | 2019-08-06 |
| CN110095646B CN110095646B (en) | 2021-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910333884.5A Active CN110095646B (en) | 2019-04-24 | 2019-04-24 | Negative pressure detection circuit and battery protection circuit |
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| Country | Link |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09182283A (en) * | 1995-12-27 | 1997-07-11 | Hitachi Microcomput Syst Ltd | Secondary battery protective circuit |
| US20010026226A1 (en) * | 2000-02-09 | 2001-10-04 | Olle Andersson | CMOS low battery voltage detector |
| CN1366189A (en) * | 2001-01-05 | 2002-08-28 | 精工电子有限公司 | Battery state monitoring circuit and battery device |
| CN101459343A (en) * | 2007-12-14 | 2009-06-17 | 富士通株式会社 | Charging control apparatus controlling charging current and control method therefore |
| CN103217605A (en) * | 2013-03-26 | 2013-07-24 | 中颖电子股份有限公司 | Charger detection device for battery protection cascade system |
| CN204302356U (en) * | 2014-12-26 | 2015-04-29 | 青岛歌尔声学科技有限公司 | A kind of circuit structure of negtive voltage detection device and negtive voltage detection device |
| CN105552457A (en) * | 2015-12-16 | 2016-05-04 | 无锡中感微电子股份有限公司 | Current detection circuit |
| CN106501585A (en) * | 2016-12-09 | 2017-03-15 | 合肥中感微电子有限公司 | One kind overcharges power detection circuit and battery protection system |
| CN107085132A (en) * | 2017-05-18 | 2017-08-22 | 东南大学 | A kind of positive voltage power under high-precision detection of negative pressure circuit |
| CN206894269U (en) * | 2017-04-25 | 2018-01-16 | 福建省福芯电子科技有限公司 | A kind of battery charging current foldback circuit |
| CN108717158A (en) * | 2018-08-29 | 2018-10-30 | 电子科技大学 | A kind of detection of negative pressure circuit suitable for Power MOSFET |
-
2019
- 2019-04-24 CN CN201910333884.5A patent/CN110095646B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09182283A (en) * | 1995-12-27 | 1997-07-11 | Hitachi Microcomput Syst Ltd | Secondary battery protective circuit |
| US20010026226A1 (en) * | 2000-02-09 | 2001-10-04 | Olle Andersson | CMOS low battery voltage detector |
| CN1366189A (en) * | 2001-01-05 | 2002-08-28 | 精工电子有限公司 | Battery state monitoring circuit and battery device |
| CN101459343A (en) * | 2007-12-14 | 2009-06-17 | 富士通株式会社 | Charging control apparatus controlling charging current and control method therefore |
| CN103217605A (en) * | 2013-03-26 | 2013-07-24 | 中颖电子股份有限公司 | Charger detection device for battery protection cascade system |
| CN204302356U (en) * | 2014-12-26 | 2015-04-29 | 青岛歌尔声学科技有限公司 | A kind of circuit structure of negtive voltage detection device and negtive voltage detection device |
| CN105552457A (en) * | 2015-12-16 | 2016-05-04 | 无锡中感微电子股份有限公司 | Current detection circuit |
| CN106501585A (en) * | 2016-12-09 | 2017-03-15 | 合肥中感微电子有限公司 | One kind overcharges power detection circuit and battery protection system |
| CN206894269U (en) * | 2017-04-25 | 2018-01-16 | 福建省福芯电子科技有限公司 | A kind of battery charging current foldback circuit |
| CN107085132A (en) * | 2017-05-18 | 2017-08-22 | 东南大学 | A kind of positive voltage power under high-precision detection of negative pressure circuit |
| CN108717158A (en) * | 2018-08-29 | 2018-10-30 | 电子科技大学 | A kind of detection of negative pressure circuit suitable for Power MOSFET |
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| Publication number | Publication date |
|---|---|
| CN110095646B (en) | 2021-07-09 |
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