CN111555397A - Control circuit for turning off discharge output during lithium battery charging - Google Patents
Control circuit for turning off discharge output during lithium battery charging Download PDFInfo
- Publication number
- CN111555397A CN111555397A CN202010433798.4A CN202010433798A CN111555397A CN 111555397 A CN111555397 A CN 111555397A CN 202010433798 A CN202010433798 A CN 202010433798A CN 111555397 A CN111555397 A CN 111555397A
- Authority
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- China
- Prior art keywords
- limiting resistor
- current limiting
- voltage
- triode
- lithium battery
- 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.)
- Granted
Links
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 37
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 23
- 238000007599 discharging Methods 0.000 claims description 12
- 230000015556 catabolic process Effects 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000002159 abnormal effect Effects 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
- 239000004065 semiconductor Substances 0.000 description 1
Images
Classifications
-
- 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
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
-
- 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
-
- 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
- H02J7/00306—Overdischarge protection
-
- 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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a control circuit for turning off discharge output when a lithium battery is charged, which comprises: a voltage input end C +, a diode D15, a voltage stabilizing diode DZ21, a current limiting resistor R4, a current limiting resistor R5, a current limiting resistor R14 and a triode Q1; the voltage input end C + is connected with the diode D15 and the stabilizing diode DZ 21; the voltage stabilizing diode DZ21 is connected with the current limiting resistor R4 and the current limiting resistor R5; the base electrode of the triode Q1 is connected with the current-limiting resistor R4 and the current-limiting resistor R14, the transmitter, the current-limiting resistor R5 and the current-limiting resistor R14 are grounded, and the collector electrode of the triode Q1 is connected with the discharge pin of the lithium battery charge-discharge control chip. The invention utilizes the diode and the voltage stabilizing diode to control the conduction voltage of the triode, realizes the control of the high and low levels of the discharge pin port of the lithium battery charge and discharge control chip, realizes the discharge control in the lithium battery charging process, has simple, stable and reliable circuit, and can realize the requirement that the charge can not be discharged.
Description
Technical Field
The invention relates to the technical field of battery charging and discharging control, in particular to a control circuit for turning off discharging output when a lithium battery is charged.
Background
When the electric vehicle is charged, because the user carelessly easily takes place the problem that the vehicle is started in the lithium battery charging process, great hidden danger is brought to user safety, and the current electric vehicle battery management system does not generally comprise an independent design which can not discharge when the lithium battery is charged, or the work of a discharging MOS (metal oxide semiconductor) tube is directly controlled by using a control signal, so that power consumption is abnormal, the service life of the battery is influenced, and in addition, the condition that the battery is over-discharged to death due to the power consumption of a detection circuit can also be generated.
Accordingly, there is a need in the art for improvements.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is as follows: the utility model provides a control circuit of turn-off discharge output when lithium cell charges to solve the problem that exists among the prior art.
According to an aspect of an embodiment of the present invention, a control circuit for turning off a discharge output when a lithium battery is charged is disclosed, including:
a voltage input end C +, a diode D15, a voltage stabilizing diode DZ21, a current limiting resistor R4, a current limiting resistor R5, a current limiting resistor R14 and a triode Q1;
the voltage input end C + is connected with the diode D15 and the stabilizing diode DZ21 and supplies power to the diode D15 and the stabilizing diode DZ 21;
the voltage stabilizing diode DZ21 is connected with the current limiting resistor R4 and the current limiting resistor R5;
the base electrode of the triode Q1 is connected with the current limiting resistor R4 and the current limiting resistor R14;
the transmitter, the current limiting resistor R5 and the current limiting resistor R14 of the triode Q1 are grounded;
the collector of the triode Q1 is connected with a discharge pin of a lithium battery charge and discharge control chip;
when the voltage input end C + is not connected with a charger, the blocking of the diode D15 enables the voltage input end C + to form low voltage to counteract the breakdown voltage of the voltage stabilizing diode DZ1, the base bias value of the triode Q1 is formed by the partial voltage of the current limiting resistor R4 and the current limiting resistor R14, the partial voltage of the current limiting resistor R4 and the current limiting resistor R14 does not reach the conducting voltage of the base of the triode Q1, at the moment, the triode Q1 is cut off, and the discharging pin of the lithium battery charging and discharging control chip is in a normal discharging control level;
when a charger is connected to a voltage input end C +, voltage provided by the charger is added to the voltage input end C +, the voltage breaks down the voltage stabilizing diode DZ1, a base bias value of a triode Q1 is formed by the partial pressure of a current limiting resistor R4 and a current limiting resistor R14, the partial pressure of the current limiting resistor R4 and the current limiting resistor R14 is larger than the conduction voltage of the base of a triode Q1, the triode Q1 is in saturated conduction, the level of a discharge pin of a lithium battery charge and discharge control chip is pulled low, the discharge pin of the lithium battery charge and discharge control chip outputs low level, and discharge is closed.
In another embodiment of the control circuit for turning off the discharge output when the lithium battery is charged according to the present invention, the resistance value of the current limiting resistor R14 is not greater than 470 ohms.
In another embodiment of the control circuit for turning off the discharge output when the lithium battery is charged according to the present invention, the zener diode DZ21 is a 24V zener diode.
Compared with the prior art, the invention has the following advantages:
the control circuit for switching off the discharge output when the lithium battery is charged utilizes the one-way conductivity of the diode and the breakdown voltage characteristic of the voltage stabilizing diode to control the conduction voltage of the triode and realize the control of the high and low levels of the discharge pin port of the lithium battery charge and discharge control chip, thereby realizing the discharge control in the lithium battery charging process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings used in the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a control circuit for turning off a discharge output when a lithium battery is charged according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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.
The following describes a control circuit for turning off discharge output during charging of a lithium battery according to the present invention in more detail with reference to the accompanying drawings and embodiments.
Fig. 1 is a schematic structural diagram of an embodiment of a control circuit for turning off a discharge output during charging of a lithium battery according to the present invention, and as shown in fig. 1, the control circuit for turning off a discharge output during charging of a lithium battery of the embodiment includes:
a voltage input end C +, a diode D15, a voltage stabilizing diode DZ21, a current limiting resistor R4, a current limiting resistor R5, a current limiting resistor R14 and a triode Q1;
the voltage input end C + is connected with the diode D15 and the stabilizing diode DZ21 and supplies power to the diode D15 and the stabilizing diode DZ 21;
the voltage stabilizing diode DZ21 is connected with the current limiting resistor R4 and the current limiting resistor R5;
the base electrode of the triode Q1 is connected with the current limiting resistor R4 and the current limiting resistor R14;
the transmitter, the current limiting resistor R5 and the current limiting resistor R14 of the triode Q1 are grounded;
the collector of the triode Q1 is connected with a discharge pin of a lithium battery charge and discharge control chip;
when the voltage input end C + is not connected with a charger, the blocking of the diode D15 enables the voltage input end C + to form low voltage to counteract the breakdown voltage of the voltage stabilizing diode DZ1, the base bias value of the triode Q1 is formed by the partial voltage of the current limiting resistor R4 and the current limiting resistor R14, the partial voltage of the current limiting resistor R4 and the current limiting resistor R14 does not reach the conducting voltage of the base of the triode Q1, at the moment, the triode Q1 is cut off, and the discharging pin of the lithium battery charging and discharging control chip is in a normal discharging control level;
when a charger is connected to a voltage input end C +, voltage provided by the charger is added to the voltage input end C +, the voltage breaks down the voltage stabilizing diode DZ1, a base bias value of a triode Q1 is formed by the partial pressure of a current limiting resistor R4 and a current limiting resistor R14, the partial pressure of the current limiting resistor R4 and the current limiting resistor R14 is larger than the conduction voltage of the base of a triode Q1, the triode Q1 is in saturated conduction, the level of a discharge pin of a lithium battery charge and discharge control chip is pulled low, the discharge pin of the lithium battery charge and discharge control chip outputs low level, and discharge is closed.
In practical design, considering that the maximum reverse leakage current of the diode D15 is 1mA, and the turn-on voltage of the transistor Q1 is greater than 0.4V, the resistance value of the current limiting resistor R14 is not greater than 470 ohms.
Because the single lithium cell is not damaged by more than 2V, 10 series of cell groups are designed, the voltage is required to be more than 20V, the voltage-stabilizing value of the voltage-stabilizing diode DZ1 is 24V, the failure of the diode D15 is facilitated at the moment, the energy of the cell groups is consumed by a charging detection circuit, the voltage is about 24V, the voltage-stabilizing diode DZ1 is cut off due to too low breakdown voltage, the detection circuit of a charger does not consume power, and the cell groups are not damaged, so that the voltage-stabilizing diode DZ21 is selected to be a 24V voltage-stabilizing diode.
The control circuit for turning off the discharge output during the charging of the lithium battery provided by the invention is described in detail above, a specific example is applied in the text to explain the principle and the implementation of the invention, and the description of the above embodiment is only used to help understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (3)
1. A control circuit for shutting down a discharge output when a lithium battery is charged, comprising:
a voltage input end C +, a diode D15, a voltage stabilizing diode DZ21, a current limiting resistor R4, a current limiting resistor R5, a current limiting resistor R14 and a triode Q1;
the voltage input end C + is connected with the diode D15 and the stabilizing diode DZ21 and supplies power to the diode D15 and the stabilizing diode DZ 21;
the voltage stabilizing diode DZ21 is connected with the current limiting resistor R4 and the current limiting resistor R5;
the base electrode of the triode Q1 is connected with the current limiting resistor R4 and the current limiting resistor R14;
the transmitter, the current limiting resistor R5 and the current limiting resistor R14 of the triode Q1 are grounded;
the collector of the triode Q1 is connected with a discharge pin of a lithium battery charge and discharge control chip;
when the voltage input end C + is not connected with a charger, the blocking of the diode D15 enables the voltage input end C + to form low voltage to counteract the breakdown voltage of the voltage stabilizing diode DZ1, the base bias value of the triode Q1 is formed by the partial voltage of the current limiting resistor R4 and the current limiting resistor R14, the partial voltage of the current limiting resistor R4 and the current limiting resistor R14 does not reach the conducting voltage of the base of the triode Q1, at the moment, the triode Q1 is cut off, and the discharging pin of the lithium battery charging and discharging control chip is in a normal discharging control level;
when a charger is connected to a voltage input end C +, voltage provided by the charger is added to the voltage input end C +, the voltage breaks down the voltage stabilizing diode DZ1, a base bias value of a triode Q1 is formed by the partial pressure of a current limiting resistor R4 and a current limiting resistor R14, the partial pressure of the current limiting resistor R4 and the current limiting resistor R14 is larger than the conduction voltage of the base of a triode Q1, the triode Q1 is in saturated conduction, the level of a discharge pin of a lithium battery charge and discharge control chip is pulled low, the discharge pin of the lithium battery charge and discharge control chip outputs low level, and discharge is closed.
2. A control circuit for turning off discharge output when charging a lithium battery as claimed in claim 1, wherein the resistance value of the current limiting resistor R14 is not more than 470 ohms.
3. The lithium battery turning off discharge output control circuit as claimed in claim 1, wherein the zener diode DZ21 is a 24V zener diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010433798.4A CN111555397B (en) | 2020-05-21 | 2020-05-21 | Control circuit for turning off discharge output during charging of lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010433798.4A CN111555397B (en) | 2020-05-21 | 2020-05-21 | Control circuit for turning off discharge output during charging of lithium battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111555397A true CN111555397A (en) | 2020-08-18 |
| CN111555397B CN111555397B (en) | 2024-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010433798.4A Active CN111555397B (en) | 2020-05-21 | 2020-05-21 | Control circuit for turning off discharge output during charging of lithium battery |
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| CN (1) | CN111555397B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114123390A (en) * | 2021-11-11 | 2022-03-01 | 广东力科新能源有限公司 | Detection apparatus for charging circuit |
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| CN111555397B (en) | 2024-06-04 |
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