CN111817396A - Circuit for simultaneously closing charging and discharging metal-oxide-semiconductor field effect transistors (MOSFETs) during high-temperature detection of protection plate - Google Patents

Circuit for simultaneously closing charging and discharging metal-oxide-semiconductor field effect transistors (MOSFETs) during high-temperature detection of protection plate Download PDF

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Publication number
CN111817396A
CN111817396A CN202010701326.2A CN202010701326A CN111817396A CN 111817396 A CN111817396 A CN 111817396A CN 202010701326 A CN202010701326 A CN 202010701326A CN 111817396 A CN111817396 A CN 111817396A
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CN
China
Prior art keywords
resistor
temperature
circuit
thermistor
protection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010701326.2A
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Chinese (zh)
Inventor
朱祥志
陈贵生
李明钧
周建中
郭平
佘伟华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tianneng Shuai Fude Energy Co Ltd
Original Assignee
Tianneng Shuai Fude Energy Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tianneng Shuai Fude Energy Co Ltd filed Critical Tianneng Shuai Fude Energy Co Ltd
Priority to CN202010701326.2A priority Critical patent/CN111817396A/en
Publication of CN111817396A publication Critical patent/CN111817396A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00309Overheat or overtemperature protection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068Battery or charger load switching, e.g. concurrent charging and load supply

Abstract

The invention relates to the technical field of protection boards, and discloses a circuit for simultaneously closing charging and discharging MOSFETs (metal oxide semiconductor field effect transistors) during high-temperature detection of a protection board, which comprises a voltage source, a first resistor R51, a component CON2, a second resistor R50, a triode Q1 and a thermistor; the voltage source output end is connected in series with one end of the first resistor R51, and the other end of the first resistor R51 is connected with the component CON 2; the triode Q1 comprises a base electrode, a collector electrode and an emitter electrode, the second resistor R50 is connected in parallel at two ends of the base electrode and the emitter electrode, the base electrode is connected with the component CON2, the collector electrode is connected with the thermistor in series, and the thermistor is connected with an integrated IC acquisition channel; the problems that in the prior art, NTC temperature probes can carry out high-temperature and low-temperature protection, but cannot only carry out high-temperature protection or low-temperature protection, both the NTC temperature probes and the low-temperature protection exist at the same time, one of the NTC temperature probes cannot be taken out, and a normally-closed or normally-open temperature probe is connected in series into a MOSFET circuit signal, so that a complex circuit or two temperature probes are used, the cost is high, and the NTC temperature probes are unstable.

Description

Circuit for simultaneously closing charging and discharging metal-oxide-semiconductor field effect transistors (MOSFETs) during high-temperature detection of protection plate
Technical Field
The invention relates to the technical field of protection boards, in particular to a circuit for simultaneously closing charging and discharging metal-oxide-semiconductor field effect transistors (MOSFET) during high-temperature detection of a protection board.
Background
The conventional high-temperature protection in the field of the protection board is NTC temperature acquisition or PTC high-temperature protection, the NTC is different in high-temperature and low-temperature protection value and can only carry out charging or discharging MOS protection, and the PTC needs to carry out more complex circuit design.
The protection circuit of the prior NTC probe has high-temperature and low-temperature protection at the same time, and can not only carry out high-temperature protection, and the normally closed and normally open temperature probes need more complex circuits or 2 probes to simultaneously carry out charging and discharging MOSFET control, so that the cost is higher, the circuits are more complex, the performance can not meet the requirements, and the like.
Disclosure of Invention
The invention provides a circuit for simultaneously closing charging and discharging MOSFETs by high-temperature detection of a protection board, which has the advantages of wide application and wide adaptability, and simultaneously prevents safety accidents caused by high temperature of a battery in summer, and solves the problems that in the prior art, NTC temperature probes can carry out high-temperature and low-temperature protection but cannot carry out high-temperature or low-temperature protection only, both of the NTC temperature probes exist simultaneously and cannot be taken out, and normally closed or normally open temperature probes are serially connected into signals of the MOSFET circuit, so that the cost is higher, and the circuit is unstable and reliable by using a complex circuit or two temperature probes.
The invention provides the following technical scheme: a circuit for protecting a board to detect high temperature and simultaneously turn off charging and discharging MOSFETs comprises a voltage source, a first resistor R51, a component CON2, a second resistor R50, a triode Q1 and a thermistor; the voltage source output end is connected in series with one end of the first resistor R51, and the other end of the first resistor R51 is connected with the component CON 2; the triode Q1 comprises a base electrode, a collector electrode and an emitter electrode, the second resistor R50 is connected in parallel to the two ends of the base electrode and the emitter electrode, the base electrode is connected with the component CON2, the collector electrode is connected with the thermistor in series, and the thermistor is connected with an integrated IC (integrated circuit) acquisition channel.
Preferably, the voltage source has a value of 5V.
Preferably, the resistance values of the first resistor R51 and the second resistor R50 are both 1M.
Preferably, the component CON2 is a high-temperature probe interface for accessing a temperature probe.
Preferably, the transistor Q1 is a chip transistor of type MM 5551.
Preferably, the thermistor is a thermistor with a negative temperature coefficient, the resistance value of the thermistor is 10K, and the B value of the thermistor is 3435.
The invention has the following beneficial effects:
the invention provides a new idea for solving the problem of high-temperature protection charging and discharging MOSFET control closing.
The battery pack configured by the designed protection plate is suitable for being used in northern areas in winter, does not need protection at low temperature, only carries out high-temperature protection, and meanwhile prevents safety accidents caused by high temperature of the battery in summer, and is wide in application and wide in adaptability.
Thirdly, the invention provides a technical scheme for solving the problem of high-temperature protection of the control closing of the charging MOSFET and the discharging MOSFET, makes a small change on the basis of the original circuit, and well solves the control of the charging MOSFET and the discharging MOSFET under the condition of using a normally closed temperature probe.
According to the invention, the original NTC probe is changed into a 10K resistor, and meanwhile, the normally-closed temperature probe is connected in series into the circuit of the 10K resistor, so that the charging and discharging output pins of the chip IC are simultaneously closed after high-temperature protection, and the MOSFET is simultaneously closed.
Fifthly, the normally closed temperature probe and the NTC probe are fused together simultaneously. The NTC acquisition probe performs temperature sampling to achieve high-temperature protection after the high-temperature protection is fully considered in the circuit design, the protection is performed by the NTC acquisition chip, the output control can be performed by the acquisition chip, and other control circuits are not required to be designed.
Drawings
Fig. 1 is a schematic block diagram of a circuit for detecting high temperature of a protection board and turning off a charging MOSFET and a discharging MOSFET simultaneously according to the present 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.
Referring to fig. 1, a circuit for protecting a board from high temperature detection while turning off charge and discharge MOSFETs includes a voltage source, a first resistor R51, a component CON2, a second resistor R50, a transistor Q1, and a thermistor.
The output end of the voltage source is connected in series with one end of a first resistor R51, and the other end of the first resistor R51 is connected with a component CON 2; the triode Q1 comprises a base electrode, a collector electrode and an emitter electrode, a second resistor R50 is connected at two ends of the base electrode and the emitter electrode in parallel, the base electrode is connected with a component CON2, the collector electrode is connected with a thermistor in series, and the thermistor is connected with an integrated IC acquisition channel.
The voltage source has a value of 5V.
The resistance values of the first resistor R51 and the second resistor R50 are both 1M.
The component CON2 is a high-temperature probe interface for accessing a temperature probe.
The transistor Q1 is a chip transistor with model number MM 5551.
The thermistor is a thermistor with a negative temperature coefficient, the resistance value of the thermistor is 10K, and the B value of the thermistor is 3435.
The working principle is as follows: the circuit uses the existing integrated IC acquisition channel, the NTC with the specification of 10K3450 is changed into a 10K resistor, a high-temperature normally-closed temperature probe is added, after the high temperature is detected, the charging and discharging MOSFETs are protected at the same time, when the temperature is recovered to the set temperature, the charging and discharging MOSFETs are turned on again, and the circuit can be set to only perform high-temperature protection and protect the charging and discharging at the same time; the number of temperature probes is reduced, the circuit complexity is reduced, and the lithium battery pack is suitable for the lithium battery pack only needing high-temperature protection.
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. Meanwhile, in the drawings of the invention, the filling pattern is only used for distinguishing the layers and is not limited at all.
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 (6)

1. The utility model provides a circuit that protection shield high temperature detected and closed simultaneously to fill, discharge MOSFET which characterized in that: the circuit comprises a voltage source, a first resistor R51, a component CON2, a second resistor R50, a triode Q1 and a thermistor; the voltage source output end is connected in series with one end of the first resistor R51, and the other end of the first resistor R51 is connected with the component CON 2; the triode Q1 comprises a base electrode, a collector electrode and an emitter electrode, the second resistor R50 is connected in parallel to the two ends of the base electrode and the emitter electrode, the base electrode is connected with the component CON2, the collector electrode is connected with the thermistor in series, and the thermistor is connected with an integrated IC (integrated circuit) acquisition channel.
2. The circuit for protecting the protection board from high temperature detection while turning off the charge and discharge MOSFETs according to claim 1, wherein: the voltage source has a value of 5V.
3. The circuit for protecting the protection board from high temperature detection while turning off the charge and discharge MOSFETs according to claim 1, wherein: the resistance values of the first resistor R51 and the second resistor R50 are both 1M.
4. The circuit for protecting the protection board from high temperature detection while turning off the charge and discharge MOSFETs according to claim 1, wherein: the component CON2 is a high-temperature probe interface for accessing a temperature probe.
5. The circuit for protecting the protection board from high temperature detection while turning off the charge and discharge MOSFETs according to claim 1, wherein: the transistor Q1 is a chip transistor of type MM 5551.
6. The circuit for protecting the protection board from high temperature detection while turning off the charge and discharge MOSFETs according to claim 1, wherein: the thermistor is a thermistor with a negative temperature coefficient, the resistance value of the thermistor is 10K, and the B value of the thermistor is 3435.
CN202010701326.2A 2020-07-20 2020-07-20 Circuit for simultaneously closing charging and discharging metal-oxide-semiconductor field effect transistors (MOSFETs) during high-temperature detection of protection plate Pending CN111817396A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010701326.2A CN111817396A (en) 2020-07-20 2020-07-20 Circuit for simultaneously closing charging and discharging metal-oxide-semiconductor field effect transistors (MOSFETs) during high-temperature detection of protection plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010701326.2A CN111817396A (en) 2020-07-20 2020-07-20 Circuit for simultaneously closing charging and discharging metal-oxide-semiconductor field effect transistors (MOSFETs) during high-temperature detection of protection plate

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CN111817396A true CN111817396A (en) 2020-10-23

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973147A (en) * 1975-10-28 1976-08-03 General Motors Corporation Temperature measuring circuit
CN101164216A (en) * 2005-04-08 2008-04-16 优昵森电子有限公司 Circuit and chip for protecting battery, method of manufacturing the same and battery pack having the same
CN203233212U (en) * 2013-05-09 2013-10-09 深圳市力通威电子科技有限公司 OA charging control circuit for lithium power battery pack
CN105162082A (en) * 2015-08-25 2015-12-16 深圳市商宇电子科技有限公司 Over-temperature protection circuit of uninterruptible power supply (UPS) charger
CN107332319A (en) * 2017-08-31 2017-11-07 努比亚技术有限公司 Battery protecting circuit, battery and terminal
CN108254099A (en) * 2017-12-29 2018-07-06 惠州市德赛西威汽车电子股份有限公司 A kind of temperature sensing circuit of thermistor
CN108670026A (en) * 2018-07-17 2018-10-19 东莞市洪钜硅胶制品有限公司 Kettle with prompting function
CN209478747U (en) * 2019-01-10 2019-10-11 力德精密工业(深圳)有限公司 A kind of temperature detecting alarm system for vulcanizer

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973147A (en) * 1975-10-28 1976-08-03 General Motors Corporation Temperature measuring circuit
CN101164216A (en) * 2005-04-08 2008-04-16 优昵森电子有限公司 Circuit and chip for protecting battery, method of manufacturing the same and battery pack having the same
CN203233212U (en) * 2013-05-09 2013-10-09 深圳市力通威电子科技有限公司 OA charging control circuit for lithium power battery pack
CN105162082A (en) * 2015-08-25 2015-12-16 深圳市商宇电子科技有限公司 Over-temperature protection circuit of uninterruptible power supply (UPS) charger
CN107332319A (en) * 2017-08-31 2017-11-07 努比亚技术有限公司 Battery protecting circuit, battery and terminal
CN108254099A (en) * 2017-12-29 2018-07-06 惠州市德赛西威汽车电子股份有限公司 A kind of temperature sensing circuit of thermistor
CN108670026A (en) * 2018-07-17 2018-10-19 东莞市洪钜硅胶制品有限公司 Kettle with prompting function
CN209478747U (en) * 2019-01-10 2019-10-11 力德精密工业(深圳)有限公司 A kind of temperature detecting alarm system for vulcanizer

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