CN111987760A - Battery overcurrent charging protection circuit - Google Patents
Battery overcurrent charging protection circuit Download PDFInfo
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- CN111987760A CN111987760A CN202010736762.3A CN202010736762A CN111987760A CN 111987760 A CN111987760 A CN 111987760A CN 202010736762 A CN202010736762 A CN 202010736762A CN 111987760 A CN111987760 A CN 111987760A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 3
- 229920005591 polysilicon Polymers 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 9
- 229910052744 lithium Inorganic materials 0.000 description 9
- 101001126234 Homo sapiens Phospholipid phosphatase 3 Proteins 0.000 description 6
- 102100030450 Phospholipid phosphatase 3 Human genes 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000013473 artificial intelligence Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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Abstract
The invention discloses a battery overcurrent charging protection circuit, which comprises a V2I voltage-to-current conversion module, an overcurrent charging protection threshold voltage setting module, a comparator, a negative high voltage bearing module, a positive power supply input port VDD, a grounding input port VSS, an input port OCP and an input port CS, wherein the V2I voltage-to-current conversion module is electrically connected with the overcurrent charging package threshold voltage setting module, the comparator is respectively connected with the negative high voltage bearing module and the overcurrent charging protection threshold voltage setting module in parallel, and the positive power supply input port VDD is a positive power supply; the ground input port VSS is a negative power supply; the input port CS is a current sensing input port, and is connected to the battery. The invention belongs to the technical field of battery charging, and particularly provides a battery overcurrent charging protection circuit which is strong in process adaptability, high in precision and safety and can be widely applied.
Description
Technical Field
The invention belongs to the technical field of battery charging, and particularly relates to a battery overcurrent charging protection circuit.
Background
With the continuous rapid development of the internet of things, big data and artificial intelligence technologies, the world of everything interconnection has come, and the lithium battery industry is probably beyond the best, so that higher requirements are provided for the safety and reliability of lithium battery power supply. The national standard of 27 published in 2014, the national mandatory standard of lithium ion battery and battery pack safety requirement for portable electronic products (GB31241-2014) has been approved and published by the national quality supervision and inspection and quarantine bureau and the national standard administration committee. The safety requirements of all lithium battery products must meet the national standard. The over-current charging function of the battery is a newly added and necessary key index with high realization difficulty, and becomes the key point for safely using lithium battery products. According to the new national standard, a lithium battery protection IC used in combination with a lithium battery must have an overcurrent charging protection function, and how to realize the safe and reliable overcurrent charging protection function becomes one of the bottlenecks in ensuring safe charging of the battery.
In order to realize the overcurrent charge detection function, the most direct method is to adopt a negative reference voltage and a comparator supporting a negative common-mode input voltage, the negative voltage detected by a CS pin of a chip is directly input to one input end of the comparator in the chip, the other input end of the comparator is connected with the negative reference voltage, but a negative reference voltage is generated, and the comparator supporting the negative common-mode input voltage is realized, so that the comparator is unacceptable in design complexity and product cost, has higher control requirement on a process procedure, has low yield of a packaged finished product, a precision range and temperature characteristics which can not reach the application standard of a high-end lithium battery protection IC, and still has certain use safety hazard.
In the prior art, an overcurrent charging protection circuit which avoids two difficulties of using a negative reference voltage generation circuit and a comparator supporting negative common-mode input voltage exists, although the overcurrent charging protection circuit can meet the product requirements of part of low-end application markets, the overcurrent charging protection circuit has larger defects or hard injuries in practice, cannot meet the high-precision requirements and parameter serialization of high-end lithium battery protection ICs, and has certain use potential safety hazards. Firstly, the fluctuation of the overcurrent charging protection threshold voltage along with the process is large, and the fluctuation of the threshold voltage at normal temperature can be reduced only by a good manufacturing process; secondly, even if the fluctuation caused by the process is reduced by the reference voltage trimming circuit, a part of the yield of the packaged finished product still has loss, and further the product cost is obviously increased; thirdly, although the reference voltage trimming circuit can reduce the fluctuation range of the overcurrent charging protection threshold voltage at normal temperature, the fluctuation of the threshold voltage in a wide temperature range of-40-85 ℃ is still large, namely the precision is poor; fourthly, when the absolute value of the over-current charging protection threshold voltage is smaller, due to the poor temperature characteristic, serious potential safety hazard exists when the over-current charging protection circuit works at a lower temperature or a higher temperature, the application requirement that the absolute value of the over-current charging protection threshold voltage is smaller cannot be met, the over-current charging protection threshold voltage is easy to change into a positive value, and therefore not only does the over-current charging protection function fail, but also other functions of the whole chip are abnormal, and the serious potential safety hazard exists.
Disclosure of Invention
In order to solve the existing problems, the invention provides the battery overcurrent charging protection circuit which has strong technological adaptability, high precision and high safety and can be widely applied.
The technical scheme adopted by the invention is as follows: the invention discloses a battery overcurrent charging protection circuit, which comprises a V2I voltage-to-current conversion module, an overcurrent charging protection threshold voltage setting module, a comparator, a negative high voltage bearing module, a positive power supply input port VDD, a grounding input port VSS, an input port OCP and an input port CS, wherein the V2I voltage-to-current conversion module is electrically connected with the overcurrent charging package threshold voltage setting module, the comparator is respectively connected with the negative high voltage bearing module and the overcurrent charging protection threshold voltage setting module in parallel, and the positive power supply input port VDD is a positive power supply; the ground input port VSS is a negative power supply; the input port CS is a current sensing input port which is connected with the battery, the input port CS senses positive voltage when the battery is discharged and senses negative voltage when the battery is charged, and negative high voltage can appear at the input port CS along with the charging of the battery in practical application;
the V2I voltage-to-current conversion module comprises a zero temperature coefficient positive reference voltage Vbg, an operational amplifier OPAMP, a PMOS pipe PM10 and a resistor Rb, wherein the zero temperature coefficient positive reference voltage Vbg is connected with the reverse input end of the operational amplifier OPAMP, the grounding input port VSS series resistor Rb is respectively connected with the same-direction input end of the operational amplifier OPAMP and the source electrode of the PMOS pipe PM10, the output end of the operational amplifier OPAMP is respectively connected with the grid electrode of the PMOS pipe PM10 and the over-current charging protection threshold voltage setting module, the drain electrode of the PMOS pipe PM10 is connected with a positive power supply input port VDD, the V2I voltage-to-current conversion module converts the zero temperature coefficient positive reference voltage Vbg into Vg through the operational amplifier OPAMP, the PMOS pipe PM10 is conducted, and the current flows through the PMOS pipe PM10 to obtain a channel current Ix which is Vbg/Rb as a source current of a current mirror;
the over-current charging protection threshold voltage setting module comprises a PMOS pipe PM11, a PMOS pipe PM12, an equivalent diode device and an adjustable resistor Rt; the grid electrode of the PMOS pipe PM11 is connected with the output end of an operational amplifier OPAMP, the grid electrode of the PMOS pipe PM11 and the grid electrode of the PMOS pipe PM10 are shared, the drain electrode of the PMOS pipe PM11 is connected with a positive power input port VDD, the source electrode of the PMOS pipe PM11 is connected with the drain electrode of the PMOS pipe PM12, the grid electrode of the PMOS pipe PM12 is connected with an input port OCP, when the overcharge protection signal does not occur to the battery, the input port OCP is at a low level, the PMOS pipe PM12 is conducted at the moment, when the overcharge protection signal occurs to the system, the input port OCP is controlled to be at a high level, and the PMOS pipe PM12 is;
the source electrode of the PMOS pipe PM12 is respectively connected with the input end of an equivalent diode device, the output end of the equivalent diode device is connected with a comparator, one end of the adjustable resistor Rt is connected with the input end CS, the other end of the adjustable resistor Rt is connected with the output end of the equivalent diode device,
the same-direction input end of the comparator is connected with a grounded input port VSS, a node IN is connected to the reverse input end of the comparator, the output end of the equivalent diode device and the adjustable resistor Rt are connected with the node IN, the output end of the comparator is connected with an output port OUT, the output port OUT is a battery overcurrent charge detection trigger output signal and is usually at a low level, an overcurrent charge protection threshold voltage setting module and the comparator together set the threshold voltage of overcurrent charge protection, specifically, a PMOS (P-channel metal oxide semiconductor) tube PM11 and a PMOS tube PM10 share a gate Vg, and the mirror current Iy is obtained as Ix; normally, no overcharge protection occurs, i.e., OCP is low, PM12 is turned on, the mirror current Iy passes through the equivalent diode device, the mirror current Iy flows to the trimmable resistor Rt and flows out of the input port CS, and thus a voltage drop IN-CS ═ Iy × Rt occurs across the trimmable resistor Rt; the node IN is used as the inverting input terminal of the comparator, the voltage of the node IN is usually greater than 0V, and the inverting input terminal of the other end of the comparator is VSS-0V, so that the output OUT of the comparator is usually at a low level, and the battery overcurrent charging protection function is not triggered; the battery is charged and is sensed at input port CS and is the negative voltage, and the voltage value is recorded as VCIP, along with the increase of charging current, VCIP reduces, and node IN voltage also reduces thereupon, if node IN voltage is less than 0V, namely node IN voltage is less than comparator positive input voltage, comparator output OUT becomes high level, triggers battery overcurrent charge protection function promptly, has just at this moment set for overcurrent charge protection threshold voltage: VCIP ═ Iy ═ - (Vbg/Rb) × (Rt ═ Vbg × (Rt/Rb), which indicates that the accuracy and temperature coefficient of the overcurrent charge protection threshold voltage depend mainly on the accuracy and temperature coefficient of both the zero temperature coefficient, zero temperature coefficient positive reference voltage Vbg, and the resistance ratio Rt/Rb.
Further, the negative high voltage bearing module includes an NMOS NM11 and a resistor R11, the ground input port VSS is connected to the gate of the NMOS NM11, the input terminal VDD is connected IN series with the resistor R11 to the drain of the NMOS NM11, the source of the NMOS NM11 is connected to a node IN, since a negative high voltage may occur IN the input port CS during charging, the voltage of the node IN is decreased after passing through the resistor Rt, and the node IN is connected to the source of the NMOS NM11, and the gate voltage of the NMOS NM11 is VSS-0, when the source voltage Vgs of the NMOS 11 is-VINAfter the voltage is greater than the starting voltage of the device, NM11 is conducted, channel current sharply increases and flows to CS through a resistor Rt, the voltage of a node IN is reduced to enable an NMOS tube NM11 to be conducted to form large leakage current, accordingly, large voltage difference is generated on the resistor Rt, the voltage of the node IN is not reduced to be too negative to damage the device NM10 connected with the node IN and the internal devices of the comparator, and the effect of bearing negative high voltage is achieved.
Further, Rb is a polysilicon resistor with a small temperature coefficient and a high resistance, so that the accuracy and the temperature characteristic of the source current Ix obtained by the V2I voltage-to-current conversion module are relatively excellent.
Further, the equivalent diode device may be an NMOS transistor NM10 whose gate and drain are connected together equivalently as a diode.
Further, the equivalent diode device may be a PMOS transistor PMD in which the gate and drain connections are equivalent to a diode connection together.
The invention with the structure has the following beneficial effects: the battery overcurrent charging protection circuit has a large selection area on a process manufacturing platform, has no strict requirements on the selection of a process procedure and the fluctuation range of various parameters of a device, can still ensure the high precision of the overcurrent charging protection threshold voltage even if the fluctuation of the parameters of the device is large, and has strong process adaptability; compared with the existing realization circuit, after the overcurrent charging protection threshold voltage of the circuit is packaged, the drift of the threshold voltage is small, the packaging yield is high, and the overall cost of the product has commercial competitiveness; in a wide temperature range of-40 ℃ to 85 ℃, the temperature coefficient of the over-current charging protection threshold voltage is small, namely the variation range of the threshold point in the wide temperature range is small, and the standard requirement of the over-current charging protection threshold voltage ultrahigh precision index can be realized; the overcurrent charge protection threshold voltage temperature coefficient of the circuit is small, even when the absolute value of the overcurrent charge protection threshold voltage is small, the wide temperature range of minus 40 ℃ to 85 ℃ can be ensured, the system can work normally and safely, the overcurrent charge protection threshold voltage still has high precision, and the application can cover the market demand of wider high-end lithium battery protection ICs.
Drawings
FIG. 1 is a schematic diagram of a battery overcurrent charging protection circuit according to the present invention;
fig. 2 is a schematic structural diagram of a battery overcurrent charging protection circuit according to an embodiment of the present invention.
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, the battery overcurrent charge protection circuit of the present invention includes a V2I voltage-to-current conversion module, an overcurrent charge protection threshold voltage setting module, a comparator, a negative high voltage bearing module, a positive power input port VDD, a ground input port VSS, an input port OCP, and an input port CS, wherein the V2I voltage-to-current conversion module is electrically connected to the overcurrent charge package threshold voltage setting module, the comparator is respectively connected in parallel to the negative high voltage bearing module and the overcurrent charge protection threshold voltage setting module, and the positive power input port VDD is a positive power supply; the ground input port VSS is a negative power supply; the input port CS is a current sensing input port, the input port CS is connected to the battery,
the V2I voltage-to-current conversion module comprises a zero temperature coefficient positive reference voltage Vbg, an operational amplifier OPAMP, a PMOS pipe PM10 and a resistor Rb, wherein the zero temperature coefficient positive reference voltage Vbg is connected with the reverse input end of the operational amplifier OPAMP, the grounding input port VSS series resistor Rb is respectively connected with the same-direction input end of the operational amplifier OPAMP and the source electrode of the PMOS pipe PM10, the output end of the operational amplifier OPAMP is respectively connected with the grid electrode of the PMOS pipe PM10 and the over-current charging protection threshold voltage setting module, the drain electrode of the PMOS pipe PM10 is connected with a positive power supply input port VDD,
the over-current charging protection threshold voltage setting module comprises a PMOS pipe PM11, a PMOS pipe PM12, an equivalent diode device and an adjustable resistor Rt; the grid electrode of the PMOS pipe PM11 is connected with the output end of the operational amplifier OPAMP, the grid electrode of the PMOS pipe PM11 and the grid electrode of the PMOS pipe PM10 are shared, the drain electrode of the PMOS pipe PM11 is connected with the positive power supply input port VDD, the source electrode of the PMOS pipe PM11 is connected with the drain electrode of the PMOS pipe PM12, the grid electrode of the PMOS pipe PM12 is connected with the input port OCP,
the source electrode of the PMOS pipe PM12 is respectively connected with the input end of an equivalent diode device, the output end of the equivalent diode device is connected with a comparator, one end of the adjustable resistor Rt is connected with the input end CS, the other end of the adjustable resistor Rt is connected with the output end of the equivalent diode device,
the same-direction input end of the comparator is connected with the grounded input port VSS, the reverse input end of the comparator is connected with a node IN, the output end of the equivalent diode device and the adjustable resistor Rt are connected with the node IN, the output end of the comparator is connected with an output port OUT, and the output port OUT is used for triggering an output signal for battery overcurrent charging detection and is usually at a low level.
The negative high-voltage bearing module comprises an NMOS (N-channel metal oxide semiconductor) tube NM11 and a resistor R11, the grounding input port VSS is connected with the grid electrode of the NMOS tube NM11, the input end VDD is connected with the drain electrode of the NMOS tube NM11 IN series through the resistor R11, and the source electrode of the NMOS tube NM11 is connected with a node IN; the Rb is a polysilicon resistor; the equivalent diode device may be an NMOS transistor NM10 whose gate and drain are connected together equivalently as a diode; the equivalent diode device may be a PMOS PMD in which the gate and drain connections are equivalent together to a diode connection.
When the battery charger is used specifically, the input port CS senses positive voltage when the battery is discharged and senses negative voltage when the battery is charged, and negative high voltage may appear at the input port CS along with the charging of the battery in practical application; the voltage-to-current conversion module of the V2I converts the zero temperature coefficient positive reference voltage Vbg into Vg through the operational amplifier OPAMP, the PMOS transistor PM10 is turned on, the current flows through the PMOS transistor PM10 to obtain a channel current Ix ═ Vbg/Rb as a source current of a current mirror, the PMOS transistor PM11 and the PMOS transistor PM10 share a gate Vg, and the mirror current Iy ═ Ix is obtained; normally, no overcharge protection occurs, OCP is low, PM12 is turned on, the mirror current Iy passes through the equivalent diode device, the mirror current Iy flows to the trimmable resistor Rt and flows out of the input port CS, and thus a voltage drop IN-CS ═ Iy × Rt occurs across the trimmable resistor Rt; the node IN is used as the inverting input terminal of the comparator, the voltage of the node IN is usually greater than 0V, and the inverting input terminal of the other end of the comparator is VSS-0V, so that the output OUT of the comparator is usually at a low level, and the battery overcurrent charging protection function is not triggered; the battery is charged and is sensed at input port CS and is the negative voltage, and the voltage value is recorded as VCIP, along with the increase of charging current, VCIP reduces, and node IN voltage also reduces thereupon, if node IN voltage is less than 0V, namely node IN voltage is less than comparator positive input voltage, comparator output OUT becomes high level, triggers battery overcurrent charge protection function promptly, has just at this moment set for overcurrent charge protection threshold voltage: VCIP ═ Iy ═ Rt ═ - (Vbg/Rb) × (Rt/Rb) ═ Vbg × (Rt/Rb), which indicates that the accuracy and temperature coefficient of the overcurrent charge protection threshold voltage mainly depend on the accuracy and temperature coefficient of the zero temperature coefficient, positive reference voltage Vbg and the resistance ratio Rt/Rb, and when the system detects the occurrence of the overcharge protection signal, the input port OCP is controlled to be at a high level, and at this time, the PMOS transistor PM12 is turned off; because the input port CS may have a negative high voltage during charging, the voltage of the node IN is decreased after passing through the resistor Rt, the node IN is connected to the source of the NMOS transistor NM11, and the gate voltage of the NMOS transistor NM11 is VSS 0, when the source voltage Vgs of NM11 is-VIN greater than the turn-on voltage of the device, NM11 is turned on, the channel current increases sharply and flows to CS through the resistor Rt, the voltage of the node IN is pulled down to turn on the NMOS transistor NM11 to form a large leakage current, so that a large voltage difference is generated across the resistor Rt, the voltage of the node IN is not decreased to a too negative voltage to damage the device NM10 connected to the node IN and the internal devices of the comparator, and a negative high voltage bearing effect is achieved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a battery overcurrent charge protection circuit which characterized in that: the overcurrent charging protection circuit comprises a V2I voltage-to-current conversion module, an overcurrent charging protection threshold voltage setting module, a comparator, a negative high voltage bearing module, a positive power supply input port VDD, a grounding input port VSS, an input port OCP and an input port CS, wherein the V2I voltage-to-current conversion module is electrically connected with the overcurrent charging package threshold voltage setting module, the comparator is respectively connected with the negative high voltage bearing module and the overcurrent charging protection threshold voltage setting module in parallel, and the positive power supply input port VDD is a positive power supply; the ground input port VSS is a negative power supply; the input port CS is a current sensing input port, the input port CS is connected with a battery, the V2I voltage-to-current conversion module comprises a zero temperature coefficient positive reference voltage Vbg, an operational amplifier OPAMP, a PMOS pipe PM10 and a resistor Rb, the zero temperature coefficient positive reference voltage Vbg is connected with the reverse input end of the operational amplifier OPAMP, the grounding input port VSS is connected with the same-direction input end of the operational amplifier OPAMP and the source electrode of the PMOS pipe PM10 respectively, the output end of the operational amplifier OPAMP is connected with the grid electrode of the PMOS pipe PM10 and an overcurrent charge protection threshold voltage setting module respectively, the drain electrode of the PMOS pipe PM10 is connected with a positive power supply input port, and the overcurrent charge protection threshold voltage setting module comprises a PMOS pipe PM11, a PMOS pipe PM12, an equivalent diode device and an adjustable resistor Rdd; the grid electrode of the PMOS pipe PM11 is connected with the output end of an operational amplifier OPAMP, the drain electrode of the PMOS pipe PM11 is connected with a positive power supply input port VDD, the source electrode of the PMOS pipe PM11 is connected with the drain electrode of the PMOS pipe PM12, and the grid electrode of the PMOS pipe PM12 is connected with an input port OCP; the source electrode of the PMOS pipe PM12 is connected with the input end of the equivalent diode device respectively, the output end of the equivalent diode device is connected with the comparator, one end of the adjustable resistor Rt is connected with the input end CS, the other end of the adjustable resistor Rt is connected with the output end of the equivalent diode device, the homodromous input end of the comparator is connected with the ground input port VSS, the reverse input end of the comparator is connected with the node IN, the output end of the equivalent diode device and the adjustable resistor Rt are connected with the node IN, and the output end of the comparator is connected with the output port OUT.
2. The battery overcurrent charge protection circuit of claim 1, wherein: the negative high-voltage bearing module comprises an NMOS (N-channel metal oxide semiconductor) tube NM11 and a resistor R11, the grounded input port VSS is connected with the grid electrode of the NMOS tube NM11, the input end VDD series resistor R11 is connected with the drain electrode of the NMOS tube NM11, and the source electrode of the NMOS tube NM11 is connected with a node IN.
3. The battery overcurrent charge protection circuit of claim 1, wherein: and Rb is a polysilicon resistor.
4. The battery overcurrent charge protection circuit of claim 1, wherein: the equivalent diode device may be an NMOS transistor NM10 whose gate and drain connections are equivalent together as a diode connection.
5. The battery overcurrent charge protection circuit of claim 1, wherein: the equivalent diode device may be a PMOS PMD in which the gate and drain connections are equivalent together to a diode connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010736762.3A CN111987760A (en) | 2020-07-28 | 2020-07-28 | Battery overcurrent charging protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010736762.3A CN111987760A (en) | 2020-07-28 | 2020-07-28 | Battery overcurrent charging protection circuit |
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| CN111987760A true CN111987760A (en) | 2020-11-24 |
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| CN202010736762.3A Pending CN111987760A (en) | 2020-07-28 | 2020-07-28 | Battery overcurrent charging protection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112821497A (en) * | 2021-01-21 | 2021-05-18 | 苏州赛芯电子科技股份有限公司 | Lithium battery protection system and lithium battery |
| CN115663963A (en) * | 2022-11-09 | 2023-01-31 | 芯合电子(上海)有限公司 | Reverse charging protection circuit |
| CN117595626A (en) * | 2023-11-28 | 2024-02-23 | 北京伽略电子股份有限公司 | Multi-output enabling circuit |
-
2020
- 2020-07-28 CN CN202010736762.3A patent/CN111987760A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112821497A (en) * | 2021-01-21 | 2021-05-18 | 苏州赛芯电子科技股份有限公司 | Lithium battery protection system and lithium battery |
| CN115663963A (en) * | 2022-11-09 | 2023-01-31 | 芯合电子(上海)有限公司 | Reverse charging protection circuit |
| CN117595626A (en) * | 2023-11-28 | 2024-02-23 | 北京伽略电子股份有限公司 | Multi-output enabling circuit |
| CN117595626B (en) * | 2023-11-28 | 2024-05-31 | 北京伽略电子股份有限公司 | Multi-output enabling circuit |
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