CN110095646B - Negative pressure detection circuit and battery protection circuit - Google Patents
Negative pressure detection circuit and battery protection circuit Download PDFInfo
- Publication number
- CN110095646B CN110095646B CN201910333884.5A CN201910333884A CN110095646B CN 110095646 B CN110095646 B CN 110095646B CN 201910333884 A CN201910333884 A CN 201910333884A CN 110095646 B CN110095646 B CN 110095646B
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- 238000001514 detection method Methods 0.000 title claims abstract description 64
- 239000003990 capacitor Substances 0.000 claims abstract description 11
- 238000010586 diagram Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
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- 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
Abstract
The invention discloses a negative pressure detection circuit and a battery protection circuit, wherein the negative pressure detection circuit comprises: a detection voltage terminal receiving a detection voltage; a reference voltage terminal receiving a reference voltage, the reference voltage being a positive voltage; a third switch connected between the first node and the detection voltage terminal; a second switch connected between the first node and a ground terminal; a first capacitor connected between the first node and the second node; a first switch connected between the second node and a reference voltage terminal; and a comparator including a first input terminal connected to the second node, a second input terminal connected to the ground terminal, and an output terminal outputting a comparison result, the first switch and the second switch being turned on and the third switch being turned off in a first period of a cycle, and the first switch and the second switch being turned off and the third switch being turned on in a second period of the cycle. Compared with the prior art, the negative voltage detection circuit can realize the comparison of negative voltage, and is simple to realize.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of circuit design, in particular to a negative voltage detection circuit and a battery protection circuit.
[ background of the invention ]
The battery protection Circuit is typically mounted in a battery, for example, a small Printed Circuit Board (PCB) inside a battery of a mobile phone, on which the battery protection Circuit is mounted. The battery protection circuit is used for controlling charging and discharging of the battery, and the basic functions of the battery protection circuit comprise overvoltage charging protection, overvoltage discharging protection, discharging overcurrent protection, charging overcurrent protection and short-circuit protection.
Fig. 1 is a schematic circuit diagram of a battery protection circuit in the prior art. The battery protection circuit includes a battery protection chip (or battery protection unit) 110, a switch combination circuit 120, a resistor R1, a resistor R2, and a capacitor C11.
The first power supply end VP of the battery protection circuit is directly connected with the positive electrode of the battery cell Bat, the second power supply end VM of the battery protection circuit is connected with the negative electrode G of the battery cell Bat through the switch combination circuit 120, and the resistor R1 and the capacitor C11 are connected in series between the positive electrode and the negative electrode G of the battery cell Bat. When the load resistor R0 is connected between the first power supply end VP and the second power supply end VM, the battery cell Bat is in a discharge state; when the battery charger 130 is connected between the first power supply terminal VP and the second power supply terminal VM, the battery cell Bat is in a charging state.
The switch-combining circuit 120 includes a first NMOS (N-Channel Metal Oxide Semiconductor) transistor MN1 and a second NMOS transistor MN 2. The source of the first NMOS transistor MN1 is connected to the negative electrode G of the battery cell Bat, the drain thereof is connected to the drain of the second NMOS transistor MN2, the source of the second NMOS transistor MN2 is connected to the second power supply terminal VM, a diode (not shown) is parasitic in the NMOS transistor MN1, and a diode (not shown) is parasitic in the NMOS transistor MN 2.
The battery protection chip 110 includes three connection terminals (or referred to as detection terminals) and two control terminals. The three connecting ends are respectively a first detection end (or called as a cell anode connecting end) VDD connected with the positive electrode of the cell BAT, a second detection end (or called as a grounding end) VSS connected with the negative electrode G of the cell BAT and a third detection end VMI connected with the second power supply end VM, and the two control ends are respectively a charging control end CO1 and a discharging control end DO 1. The connection end VDD is connected with a connection node between the resistor R1 and the capacitor C11, the connection end VSS is connected with a negative electrode G of the battery cell Bat, the connection end VMI is connected with the second power supply terminal VM through a resistor R2, the charge control end CO1 is connected with a gate of the NMOS transistor MN2, and the discharge control end DO1 is connected with a gate of the NMOS transistor MN 1.
Referring to fig. 1, the battery protection chip 110 includes an overcharge detection circuit 112, an overdischarge detection circuit 114, a discharge overcurrent detection circuit (not shown), a charge overcurrent detection circuit 116, a short circuit detection circuit 117, and a control circuit 118. The control circuit 118 generates a charge control signal according to the detection signals output by the overcharge detection circuit 112, the overdischarge detection circuit 114, the discharge overcurrent detection circuit, the charge overcurrent detection circuit 116, and the short circuit detection circuit 117, and outputs the charge control signal through the charge control terminal CO1, and generates a discharge control signal and outputs the discharge control signal through the discharge control terminal DO 1. Specifically, when the battery protection chip 110 detects that the voltage of the battery cell Bat exceeds the over-voltage charging threshold (e.g., 4.3V) and the duration is greater than the over-charge protection delay time (e.g., 100mS), the charge control signal CO1 output by the control circuit 118 is at a low level, so that the NMOS transistor MN2 is turned off to cut off the charging loop of the battery cell Bat, thereby implementing charging prohibition; when the battery protection chip 110 detects that the voltage of the battery cell Bat is lower than the overvoltage discharge threshold (e.g., 2.3V) and the duration is greater than the overdischarge protection delay time (e.g., 40mS), the discharge control signal DO1 output by the control circuit 118 is at a low level, so that the NMOS transistor MN2 is turned off to cut off the discharge loop of the battery cell Bat, thereby inhibiting discharge; when the battery protection chip 110 detects that the voltage of the second power supply terminal VM is higher than the discharge overcurrent threshold (e.g., 150mV) and the duration is longer than the overcurrent discharge protection delay time (e.g., 12mS), the discharge control signal DO1 output by the control circuit 118 is at low level, so that the NMOS transistor MN2 is turned off, thereby implementing discharge inhibition; when the battery protection chip 110 detects that the voltage of the second power supply terminal VM is higher than the short-circuit protection threshold (e.g., 1V) and the duration is longer than the short-circuit protection delay time (e.g., 2 to 80uS), the signal DO1 output by the control circuit 118 is at low level, so that the NMOS transistor MN2 is turned off, thereby inhibiting discharge.
When the battery protection chip 110 detects that the voltage of the second power supply terminal VM is lower than the charging overcurrent protection threshold (a negative value) and the duration is longer than a period of time, the signal CO1 output by the control circuit 118 is at a low level, so that the NMOS transistor MN1 is turned off, thereby implementing charging prohibition. However, the current charging overcurrent detection circuit 116 is complex to implement due to the charging overcurrent protection threshold.
Therefore, it is necessary to provide a solution to solve the above problems.
[ summary of the invention ]
The present invention is directed to provide a negative voltage detection circuit and a battery protection circuit, which are simple to implement and can compare negative voltages.
In order to solve the above-mentioned problems, according to an aspect of the present invention, there is provided a negative voltage detection circuit including: a detection voltage terminal receiving a detection voltage; a reference voltage terminal receiving a reference voltage, the reference voltage being a positive voltage; a third switch connected between the first node and the detection voltage terminal; a second switch connected between the first node and a ground terminal; a first capacitor connected between the first node and the second node; a first switch connected between the second node and a reference voltage terminal; and a comparator including a first input terminal connected to the second node, a second input terminal connected to the ground terminal, and an output terminal outputting a comparison result, the first switch and the second switch being turned on and the third switch being turned off in a first period of a cycle, and the first switch and the second switch being turned off and the third switch being turned on in a second period of the cycle.
Further, when the comparison result is a first logic level, it indicates that the detection voltage is less than the negative reference voltage-Vref, and when the comparison result is a second logic level, it indicates that the detection voltage is greater than the negative reference voltage-Vref.
According to another aspect of the present invention, there is provided a battery protection circuit including: a first power supply terminal; a second power supply terminal; the switch combination circuit is connected between the negative electrode of the battery cell and the second power supply end; charging overcurrent protection circuit, it includes: the detection voltage end is connected with the second power supply end and receives detection voltage; a reference voltage terminal receiving a reference voltage, the reference voltage being a positive voltage; a third switch connected between the first node and the detection voltage terminal; a second switch connected between the first node and a ground terminal; a first capacitor connected between the first node and the second node; a first switch connected between the second node and a reference voltage terminal; and a comparator including a first input terminal connected to the second node, a second input terminal connected to the ground terminal, and an output terminal outputting a comparison result, the first switch and the second switch being turned on and the third switch being turned off in a first period of a cycle, the first switch and the second switch being turned off and the third switch being turned on in a second period of the cycle, the switching combination circuit being controlled based on the comparison result output from the comparator.
Further, when the comparison result is a first logic level, it indicates that the detection voltage is less than the negative reference voltage-Vref, and when the comparison result is a second logic level, it indicates that the detection voltage is greater than the negative reference voltage-Vref.
Compared with the prior art, the negative voltage detection circuit can realize the comparison of negative voltage, and is simple to realize.
Other objects, features and advantages of the present invention will be described in detail in the following detailed description of the preferred embodiments, which proceeds with reference to the accompanying drawings.
[ description of the drawings ]
The present invention will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements, and in which:
FIG. 1 is a schematic circuit diagram of a battery protection circuit in one embodiment of the present invention;
fig. 2 is a circuit diagram of a negative voltage detection circuit in one embodiment of the invention.
[ detailed description ] embodiments
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least an implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. The terms "plurality" or "a plurality" in the present invention mean two or more. "and/or" in the present invention means "and" or ".
The invention provides a negative voltage detection circuit which can realize negative voltage detection by a simple circuit.
Fig. 2 is a circuit diagram of a negative voltage detection circuit 200 according to an embodiment of the invention. As shown in fig. 2, the negative voltage detection circuit 200 includes: a detection voltage terminal A for receiving a detection voltage VM; a reference voltage terminal C that receives a reference voltage VREF, which is a positive voltage; a third switch W3 connected between the first node B and the detection voltage terminal a; a second switch W2 connected between the first node B and the ground G; a first capacitor C1 connected between the first node B and the second node D; a first switch W1 connected between the second node D and the reference voltage terminal C; a comparator (not shown).
The comparator includes a first input terminal connected to the second node D, a second input terminal connected to the ground terminal G, and an output terminal outputting a comparison result.
In a first period Φ 1 of one cycle, the first switch W1 and the second switch W2 are turned on, the third switch W3 is turned off, and the reference voltage VREF charges the capacitor C1 until the voltage of the capacitor C1 is equal to the reference voltage VREF, wherein the voltage VB at the first node B is equal to 0, the voltage VO at the second node D is equal to VREF, and VREF is the voltage value of the reference voltage VREF.
In a second period Φ 2 of one cycle, the first switch W1 and the second switch W2 are turned off, the third switch W3 is turned on, and the sensing voltage terminal a is connected to the first node B through the third switch W3, where the voltage VB at the first node B is VM, the voltage VO at the second node D is VM + VREF, VREF is a voltage value of the reference voltage VREF, and VM is a voltage value of the sensing voltage VM received by the sensing voltage terminal a. The comparator compares the voltage VO of the second node D with the level 0, and determines the magnitude between VM and-VREF by comparing the magnitudes of VO and 0. When VO is less than 0, VM is less than-VREF, and when VO is greater than 0, VM is greater than-VREF. Specifically, when the comparison result is a first logic level, it indicates that the detection voltage is less than the negative reference voltage-Vref, and when the comparison result is a second logic level, it indicates that the detection voltage is greater than the negative reference voltage-Vref.
Therefore, the invention can realize the detection of the negative voltage through a simple circuit. According to an aspect of the present invention, the negative voltage detection circuit 200 of the present invention can be used as the charging overcurrent detection circuit 116 in the battery protection circuit when the detection voltage terminal a is connected to the second power supply terminal VM. When the comparator finds that VO is less than 0 and the duration is greater than a period of time, it is determined that charging overcurrent occurs, and then the signal CO1 output by the control circuit 118 is at a low level, so that the NMOS transistor MN1 is turned off, thereby implementing charging prohibition.
In the present invention, the terms "connected", connected, "connecting," and "connecting" mean electrically connected, and if not specifically stated, directly or indirectly indicate electrically connected.
The foregoing description has disclosed fully preferred embodiments of the present invention. It should be noted that those skilled in the art can make modifications to the embodiments of the present invention without departing from the scope of the appended claims. Accordingly, the scope of the appended claims is not to be limited to the specific embodiments described above.
Claims (4)
1. A negative voltage detection circuit, comprising:
a detection voltage terminal receiving a detection voltage;
a reference voltage terminal receiving a reference voltage, the reference voltage being a positive voltage;
a third switch connected between the first node and the detection voltage terminal;
a second switch connected between the first node and a ground terminal;
a first capacitor connected between the first node and the second node;
a first switch connected between the second node and a reference voltage terminal;
a comparator including a first input terminal connected to the second node, a second input terminal connected to the ground terminal, and an output terminal outputting a comparison result,
the first switch and the second switch are turned on and the third switch is turned off in a first period within one cycle, and the first switch and the second switch are turned off and the third switch is turned on in a second period within one cycle.
2. The negative voltage detection circuit according to claim 1,
and when the comparison result is a first logic level, the detection voltage is less than the negative reference voltage-Vref, and when the comparison result is a second logic level, the detection voltage is greater than the negative reference voltage-Vref.
3. A battery protection circuit, comprising:
a first power supply terminal;
a second power supply terminal;
the switch combination circuit is connected between the negative electrode of the battery cell and the second power supply end;
charging overcurrent protection circuit, it includes:
the detection voltage end is connected with the second power supply end and receives detection voltage;
a reference voltage terminal receiving a reference voltage, the reference voltage being a positive voltage;
a third switch connected between the first node and the detection voltage terminal;
a second switch connected between the first node and a ground terminal;
a first capacitor connected between the first node and the second node;
a first switch connected between the second node and a reference voltage terminal;
a comparator including a first input terminal connected to the second node, a second input terminal connected to the ground terminal, and an output terminal outputting a comparison result,
the first switch and the second switch are turned on and the third switch is turned off in a first period within one cycle, and the first switch and the second switch are turned off and the third switch is turned on in a second period within one cycle, and the switch combination circuit is controlled based on a comparison result output from the comparator.
4. The battery protection circuit of claim 3,
and when the comparison result is a first logic level, the detection voltage is less than the negative reference voltage-Vref, and when the comparison result is a second logic level, the 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 |
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| 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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| CN110095646A CN110095646A (en) | 2019-08-06 |
| CN110095646B true CN110095646B (en) | 2021-07-09 |
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| CN201910333884.5A Active CN110095646B (en) | 2019-04-24 | 2019-04-24 | Negative pressure detection circuit and battery protection circuit |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09182283A (en) * | 1995-12-27 | 1997-07-11 | Hitachi Microcomput Syst Ltd | Secondary battery protective circuit |
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| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2359203B (en) * | 2000-02-09 | 2004-09-01 | Mitel Semiconductor Ab | CMOS Low battery voltage detector |
-
2019
- 2019-04-24 CN CN201910333884.5A patent/CN110095646B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09182283A (en) * | 1995-12-27 | 1997-07-11 | Hitachi Microcomput Syst Ltd | Secondary battery protective circuit |
| 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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| CN110095646A (en) | 2019-08-06 |
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