CN112653098A - Battery output undervoltage protection circuit - Google Patents

Battery output undervoltage protection circuit Download PDF

Info

Publication number
CN112653098A
CN112653098A CN202011551031.8A CN202011551031A CN112653098A CN 112653098 A CN112653098 A CN 112653098A CN 202011551031 A CN202011551031 A CN 202011551031A CN 112653098 A CN112653098 A CN 112653098A
Authority
CN
China
Prior art keywords
voltage
battery
resistor
unit
output
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
CN202011551031.8A
Other languages
Chinese (zh)
Inventor
张正兴
吕凤龙
曹晗晖
史家涛
黄枭凯
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.)
Weichai Power Co Ltd
Original Assignee
Weichai Power 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 Weichai Power Co Ltd filed Critical Weichai Power Co Ltd
Priority to CN202011551031.8A priority Critical patent/CN112653098A/en
Publication of CN112653098A publication Critical patent/CN112653098A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • 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
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Protection Of Static Devices (AREA)

Abstract

The application provides a battery output undervoltage protection circuit, includes: the battery voltage acquisition unit, the comparison unit, the control unit and the switch unit are positioned in the battery output loop; the battery voltage comparison unit is used for acquiring the output voltage of the battery and outputting the acquired acquisition value to the comparison unit; the comparison unit is used for comparing the acquisition value with the threshold voltage, generating corresponding comparison voltage and outputting the comparison voltage to the control unit; the control unit is used for controlling the switch unit to be switched off when the output voltage of the comparative voltage representation battery is lower than a preset undervoltage limit value, so that the battery stops outputting; that is to say, according to the change of the output voltage of the battery, when the output voltage of the battery is lower than the preset undervoltage limit value, the control unit controls the switch unit to be switched off, so that the battery stops discharging, and the problems that the battery is under-voltage, the function and the performance of a circuit board are abnormal, the battery is damaged irreversibly, and even accidents are caused or enlarged are avoided.

Description

Battery output undervoltage protection circuit
Technical Field
The invention relates to the technical field of power electronics, in particular to a battery output undervoltage protection circuit.
Background
With the continuous development of energy storage technology, batteries become the first choice power supply mode of many devices and devices which are inconvenient to directly take electricity to the power grid in real time, and because the required voltages for the operation of various devices and devices are different, the types and models of the batteries are more and more in order to meet different operation requirements.
At present, most circuit boards are mainly powered by batteries, so the output voltage of the batteries directly affects the functions and performances of the circuit boards. When the output voltage of the battery is too low, that is, when the output voltage of the battery is under-voltage, the abnormality of the function and performance of the circuit board can be caused, if the battery is in an under-voltage state for a long time, the electrolyte can be decomposed to cause the characteristic degradation of the battery, the charging frequency is influenced, the irreversible damage is caused to the battery, and even the accident is caused or enlarged.
Disclosure of Invention
To this, this application provides a battery output undervoltage protection circuit to when solving the battery undervoltage, the circuit board function, the performance that arouse are unusual, and cause self irreversible damage, cause or enlarge the problem of accident even.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the invention discloses a battery output undervoltage protection circuit, which is characterized by comprising: the battery voltage acquisition unit, the comparison unit, the control unit and the switch unit are positioned in the battery output loop; wherein,
the battery voltage acquisition unit is used for acquiring the output voltage of the battery and outputting the acquired acquisition value to the comparison unit;
the comparison unit is used for comparing the acquisition value with a threshold voltage, generating a corresponding comparison voltage and outputting the comparison voltage to the control unit;
the control unit is used for controlling the switch unit to be switched off when the comparison voltage represents that the output voltage of the battery is lower than a preset undervoltage limit value, so that the battery stops outputting.
Optionally, in the above-mentioned battery output under-voltage protection circuit, the control unit is further configured to:
and when the comparison voltage represents that the output voltage of the battery is not lower than the preset undervoltage limit value, controlling the switch unit to be switched on to enable the battery to continuously output.
Optionally, in the above battery output under-voltage protection circuit, the battery voltage collecting unit includes: a first resistor and a second resistor; wherein:
one end of the first resistor is connected with the positive electrode of the battery;
the other end of the first resistor is connected with one end of the second resistor, and a connection point is used as the output end of the battery voltage acquisition unit;
the other end of the second resistor is connected with the negative electrode of the battery.
Optionally, in the above battery output under-voltage protection circuit, the comparing unit includes: a first comparator and a hysteresis comparing unit; wherein:
the non-inverting input end of the first comparator is used as the input end of the comparison unit;
the inverting input end of the first comparator is connected with the output end of the first comparator and the first input end of the hysteresis comparison unit;
a second input terminal of the hysteresis comparison unit receives the threshold voltage;
and the output end of the hysteresis comparison unit is used as the output end of the comparison unit.
Optionally, in the undervoltage battery output protection circuit, the hysteresis comparing unit includes: a second comparator, a third resistor and a fourth resistor; wherein:
the non-inverting input end of the second comparator is respectively connected with one end of the third resistor and one end of the fourth resistor, and the connection point is used as the first input end of the hysteresis comparison unit;
one end of the fourth resistor is connected to the negative electrode of the battery;
the inverting input end of the second comparator is used as the second input end of the hysteresis comparison unit;
the output end of the second comparator is connected with the other end of the third resistor, and the connection point is used as the output end of the hysteresis comparison unit.
Optionally, in the above battery output under-voltage protection circuit, the control unit includes: the first switch tube, the fifth resistor and the sixth resistor; wherein:
one end of the fifth resistor is used as the input end of the control unit, and the other end of the fifth resistor is connected with the control end of the first switching tube;
the first end of the first switch tube is connected with the negative electrode of the battery, and the second end of the first switch tube is connected with one end of the sixth resistor;
and the other end of the sixth resistor is used as the output end of the control unit.
Optionally, in the above battery output under-voltage protection circuit, the switch unit includes: the second switch tube, the seventh resistor and the voltage stabilizing unit; wherein:
one end of the seventh resistor is connected with the control end of the second switching tube and one end of the voltage stabilizing unit respectively, and the connection point is used as the input end of the switching unit;
the other end of the seventh resistor, the first end of the second switching tube and the other end of the voltage stabilizing unit are respectively connected to the anode of the battery;
and the second end of the second switching tube is used as the output end of the switching unit and is connected with a load.
Optionally, in the above battery output under-voltage protection circuit, the voltage regulation unit includes: and two ends of the two voltage stabilizing diodes which are in positive and negative series connection are respectively used as two ends of the voltage stabilizing unit after series connection.
Optionally, in the above battery output under-voltage protection circuit, the method further includes: and the voltage stabilizing power supply unit is used for supplying power to the comparison unit and/or supplying the threshold voltage.
Optionally, in the undervoltage battery output protection circuit, the regulated power supply unit includes: an eighth resistor, a ninth resistor, a tenth resistor, a third zener diode and a capacitor; wherein:
one end of the eighth resistor is connected with the positive electrode of the battery;
the other end of the eighth resistor is respectively connected with one end of a ninth resistor, the cathode of the third voltage stabilizing diode and one end of the capacitor, and a connection point is used as a first output end of the voltage stabilizing power supply unit and supplies power to the comparison unit;
the other end of the ninth resistor is connected with one end of the tenth resistor, and a connection point is used as a second output end of the voltage-stabilized power supply unit and outputs the threshold voltage;
the other end of the tenth resistor, the anode of the third voltage stabilizing diode and the other end of the capacitor are respectively connected with the cathode of the battery.
Based on the battery under-voltage protection circuit provided by the invention, the battery under-voltage protection circuit comprises: the battery voltage acquisition unit, the comparison unit, the control unit and the switch unit are positioned in the battery output loop; the battery voltage comparison unit is used for acquiring the output voltage of the battery and outputting the acquired acquisition value to the comparison unit; the comparison unit is used for comparing the acquisition value with the threshold voltage, generating corresponding comparison voltage and outputting the comparison voltage to the control unit; the control unit is used for controlling the switch unit to be switched off when the output voltage of the comparative voltage representation battery is lower than a preset undervoltage limit value, so that the battery stops outputting; that is to say, according to the change of the output voltage of the battery, when the output voltage of the battery is lower than the preset undervoltage limit value, the control unit controls the switch unit to be switched off, so that the battery stops discharging, and the problems that the battery is under-voltage, the function and the performance of a circuit board are abnormal, the battery is damaged irreversibly, and even accidents are caused or enlarged are avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a battery output under-voltage protection circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another battery output under-voltage protection circuit according to an embodiment of the present disclosure;
fig. 3 is a specific circuit diagram of a battery output under-voltage protection circuit according to an embodiment of the present disclosure;
fig. 4 is a specific circuit diagram of another battery output under-voltage protection circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of another battery output under-voltage protection circuit according to an embodiment of the present application;
fig. 6 is a specific circuit diagram of another battery output under-voltage protection circuit according to an embodiment of the present application.
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.
First, the under-voltage is a phenomenon that the line voltage is greatly reduced or even disappears in a short time due to a short-circuit fault or an insufficient output capability of the battery itself. Undervoltage can cause damage to lines and electrical equipment, for example, the motor can be tired down and locked, and overcurrent which is several times of rated current is generated, and the motor is burnt out. When the voltage is recovered, the voltage of the motor is greatly reduced due to the self-starting of a large number of motors, and damage is caused. Similarly, when the battery is over-discharged, the battery is damaged by the undervoltage phenomenon.
Therefore, the embodiment of the application provides a battery output under-voltage protection circuit to solve the problems of abnormal functions and performances of a circuit board, irreversible damage of the circuit board, and even accidents caused or enlarged when the battery is under-voltage.
Referring to fig. 1, the battery output under-voltage protection circuit mainly includes: a battery voltage acquisition unit 101, a comparison unit 102, a control unit 103 and a switch unit 104 located in the battery output loop. Wherein:
the battery voltage acquisition unit 101 is configured to acquire an output voltage of the battery and output an acquired value to the comparison unit 102.
In practical applications, as shown in fig. 3, 4 or 6, the battery voltage collecting unit 101 includes: a first resistor R107 and a second resistor R108. Wherein:
one end of the first resistor R107 is connected with the anode P of the Battery Battery;
the other end of the first resistor R107 is connected to one end of the second resistor R108, and the connection point serves as the output end of the battery voltage acquisition unit 101 to output an acquisition value.
The other end of the second resistor R108 is connected to the negative electrode N of the Battery.
In practical applications, in addition to the battery voltage collecting unit 101 shown in fig. 3, 4 or 6 and composed of the first resistor R107 and the second resistor R108, the output voltage of the battery may be collected by other existing collecting methods, for example, a plurality of resistors are connected in series to perform voltage division collection, or a voltage sensor is used to collect the output voltage of the battery to obtain the collected value.
The comparing unit 102 is configured to compare the collected value with a threshold voltage, generate a corresponding comparison voltage, and output the comparison voltage to the control unit 103.
In practical applications, as shown in fig. 2 and 3, the comparing unit 102 includes: a first comparator U101B and a hysteresis comparison unit 1021. Wherein:
the non-inverting input of the first comparator U101B serves as an input of the comparing unit 102 and receives the collected value.
The inverting input terminal of the first comparator U101B is connected to the output terminal thereof and the first input terminal of the hysteresis comparing unit 1021.
A second input terminal of the hysteresis comparing unit 1021 receives a threshold voltage.
An output end of the hysteresis comparing unit 1021 is used as an output end of the comparing unit 102 to output a comparison voltage.
In practical applications, as shown in fig. 3, 4 or 6, the hysteresis comparing unit 1021 includes: a second comparator U101A, a third resistor R105, and a fourth resistor R106. Wherein:
the non-inverting input terminal of the second comparator U101A is connected to one end of the third resistor R105 and one end of the fourth resistor R106, respectively, and the connection point is used as the first input terminal of the hysteresis comparing unit 1021.
One end of the fourth resistor R106 is connected to the negative electrode N of the Battery.
An inverting input terminal of the second comparator U101A serves as a second input terminal of the hysteresis comparing unit 1021.
The output end of the second comparator U101A is connected to the other end of the third resistor R105, and the connection point is used as the output end of the hysteresis comparing unit 1021.
Note that the threshold voltage may be provided by the regulated power supply unit 105 provided in the following of the present application, or may be provided by an external device. In practice, in order to reduce unnecessary cost expenditure in the battery output undervoltage protection circuit, the threshold voltage is preferably provided by the regulated power supply unit 105 described below, but it falls within the scope of the present application whether the threshold voltage provided by the regulated power supply unit 105 or the threshold voltage provided by an external device is used.
The control unit 103 is configured to control the switch unit 104 to turn off when the output voltage of the comparative voltage representation battery is lower than the preset under-voltage limit value, so that the battery stops outputting.
In practical applications, as shown in fig. 3, 4 or 6, the control unit 103 mainly includes: a first switch tube Q102, a fifth resistor R104 and a sixth resistor R103. Wherein:
one end of the fifth resistor R104 serves as an input end of the control unit 103, and receives the comparison voltage.
The other end of the fifth resistor R104 is connected to the control end of the first switch Q102.
A first end of the first switch tube Q102 is connected to a negative electrode N of the Battery, and a second end of the first switch tube Q102 is connected to one end of the sixth resistor R103.
The other end of the sixth resistor R103 serves as an output terminal of the control unit 103.
It should be noted that the first switching transistor Q102 may be an NPN type transistor, and a control terminal thereof is a base, a first terminal thereof is an emitter, and a second terminal thereof is a collector. In practical applications, the first switching tube Q102 is mainly used for amplifying the comparison voltage output by the control unit 103.
In practical applications, as shown in fig. 3, the switch unit 104 mainly includes: a second switch tube Q101, a seventh resistor R102 and a voltage stabilizing unit 1041. Wherein:
one end of the seventh resistor R102 is connected to the control end of the second switching tube Q101 and one end of the voltage stabilizing unit 1041, respectively, and the connection point is used as the input end of the switching unit 104.
The other end of the seventh resistor R102, the first end of the second switching tube Q101, and the other end of the voltage stabilizing unit 1041 are respectively connected to the positive electrode P of the Battery.
The second end of the second switch tube Q101 is connected to a load as the output end of the switch unit 104.
In practical application, the voltage stabilizing unit 1041 is mainly used for realizing a voltage stabilizing protection effect on the second switching tube Q101 in the switching unit 104, and mainly includes: two zener diodes (D1011 and D1012 in fig. 4 or fig. 6) connected in series in the positive and negative directions are respectively used as two ends of the voltage stabilizing unit 1041.
As shown in fig. 4 or fig. 6, the specific connection manner of the two zener diodes of the voltage regulator unit 1041 may be: an anode of the first zener diode D1011 serves as one end of the zener unit 1041, a cathode of the first zener diode D1011 is connected to a cathode of the second zener diode D1012, and an anode of the second zener diode D1012 serves as the other end of the zener unit 1041.
It should be noted that the second switch Q101 may be a PMOS transistor with diode, and its control terminal is a gate, the first terminal is a source, and the second terminal is a drain. In practical applications, when the voltage between the gate and the source of the second switching tube Q101 is lower than its own cut-off voltage, the second switching tube Q101 is turned on, and conversely, the second switching tube Q101 is turned off.
It should be noted that, in practical applications, the on or off of the second switching tube Q101 is controlled by the voltage output by the control unit 103. When the voltage output by the control unit 103 is greater than the cut-off voltage of the second switching tube Q101, the second switching tube Q101 is turned off, the battery output circuit is in a disconnected state, and the battery stops outputting.
In summary, the comparison voltage indicating that the output voltage of the battery is lower than the preset undervoltage limit can be understood as: after the comparison voltage output by the comparison unit 102 is amplified by the first switching tube Q102 in the control unit 103, when the voltage output to the switching unit 104 is greater than the cut-off voltage of the second switching tube Q101, it is regarded that the comparison voltage represents that the output voltage of the battery is lower than the preset undervoltage limit value.
Based on the above principle, the battery under-voltage protection circuit provided in this embodiment can control the switch unit 104 to be turned off through the control unit 103 according to the change of the output voltage of the battery when the output voltage of the battery is lower than the preset under-voltage limit value, so as to stop discharging the battery, thereby avoiding the problems of abnormal functions and performances of the circuit board, irreversible damage of the battery, and even accidents or expansion.
In addition, the hysteresis comparator formed by the second comparator U101A, the third resistor R105 and the fourth resistor R106 in the hysteresis comparison unit 1021 can prevent the second switching tube Q101 in the switching unit 104 from being frequently switched when the battery is under-voltage, thereby further improving the stability of the battery output.
Optionally, in practical applications, the control unit 103 is further configured to control the switch unit 104 to be turned on to enable the battery to output continuously when the output voltage of the comparison voltage representation battery is not lower than the preset under-voltage limit value.
Specifically, referring to fig. 1 to 6, it can be understood that the comparison voltage indicates that the output voltage of the battery is not lower than the preset under-voltage limit value: after the comparison voltage output by the comparison unit 102 is amplified by the first switching tube Q102 in the control unit 103, when the voltage output to the switching unit 104 is smaller than the cut-off voltage of the second switching tube Q101, it is regarded that the comparison voltage represents that the output voltage of the battery is not lower than the preset undervoltage limit value.
Based on the above principle, the control unit 103 provided in this embodiment can control the switch unit 104 to be turned on when the output voltage of the comparative voltage representation battery is not lower than the preset undervoltage limit value, so that the battery can be continuously output, and thus the battery can be ensured to be in a non-undervoltage state all the time in the output process.
Based on fig. 1 or fig. 2, taking fig. 2 as an example, the under-voltage battery output protection circuit according to another embodiment of the present application further includes, as shown in fig. 5: a regulated power supply unit 105 for supplying power and/or a threshold voltage to the comparison unit 102.
As shown in fig. 6, the regulated power supply unit 105 mainly includes: an eighth resistor R101, a ninth resistor R109, a tenth resistor R110, a third zener diode D102, and a capacitor C101.
One end of the eighth resistor R101 is connected to the positive electrode P of the Battery.
The other end of the eighth resistor R101 is connected to one end of the ninth resistor R109, the cathode of the third zener diode D102, and one end of the capacitor C101, respectively, and the connection point serves as a first output end of the regulated power supply unit 105 to supply power to the comparison unit 102.
The other end of the ninth resistor R109 is connected to one end of the tenth resistor R110, and the connection point serves as a second output terminal of the regulated power supply unit 105 to output a threshold voltage.
The other end of the tenth resistor R110, the anode of the third zener diode D102, and the other end of the capacitor C101 are respectively connected to the cathode N of the Battery.
In practical applications, the first output terminal of the regulated power supply unit 105 is respectively connected to the positive power supply terminal of the first comparator U101B and the positive power supply terminal of the second comparator U101A, and the negative power supply terminal of the first comparator U101B and the negative power supply terminal of the second comparator U101A are respectively connected to the negative terminal N of the Battery, so that the regulated power supply unit 105 can supply power to the first comparator U101B and the second comparator U101A.
It should be noted that, in addition to the first comparator U101B and the second comparator U101A being powered by the internal battery power supply method, in practical applications, an external power supply method may be used to implement power supply to the first comparator U101B and the second comparator U101A by an external power supply. The specific power supply mode can be determined according to the user requirement and the application condition, and the application is not limited and belongs to the protection scope of the application.
The voltage-stabilized power supply unit 105 provided in this embodiment can supply power to power consuming elements in the battery output under-voltage protection circuit through the battery itself, without using an external power supply device, and thus can avoid the problem of cost increase caused by using an external power supply device.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It is further 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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims (10)

1. A battery output under-voltage protection circuit, comprising: the battery voltage acquisition unit, the comparison unit, the control unit and the switch unit are positioned in the battery output loop; wherein,
the battery voltage acquisition unit is used for acquiring the output voltage of the battery and outputting the acquired acquisition value to the comparison unit;
the comparison unit is used for comparing the acquisition value with a threshold voltage, generating a corresponding comparison voltage and outputting the comparison voltage to the control unit;
the control unit is used for controlling the switch unit to be switched off when the comparison voltage represents that the output voltage of the battery is lower than a preset undervoltage limit value, so that the battery stops outputting.
2. The under-voltage battery output protection circuit of claim 1, wherein the control unit is further configured to:
and when the comparison voltage represents that the output voltage of the battery is not lower than the preset undervoltage limit value, controlling the switch unit to be switched on to enable the battery to continuously output.
3. The under-voltage battery output protection circuit of claim 1, wherein the battery voltage collecting unit comprises: a first resistor and a second resistor; wherein:
one end of the first resistor is connected with the positive electrode of the battery;
the other end of the first resistor is connected with one end of the second resistor, and a connection point is used as the output end of the battery voltage acquisition unit;
the other end of the second resistor is connected with the negative electrode of the battery.
4. The under-voltage battery protection circuit of claim 1, wherein the comparing unit comprises: a first comparator and a hysteresis comparing unit; wherein:
the non-inverting input end of the first comparator is used as the input end of the comparison unit;
the inverting input end of the first comparator is connected with the output end of the first comparator and the first input end of the hysteresis comparison unit;
a second input terminal of the hysteresis comparison unit receives the threshold voltage;
and the output end of the hysteresis comparison unit is used as the output end of the comparison unit.
5. The under-voltage battery protection circuit of claim 4, wherein the hysteresis comparator unit comprises: a second comparator, a third resistor and a fourth resistor; wherein:
the non-inverting input end of the second comparator is respectively connected with one end of the third resistor and one end of the fourth resistor, and the connection point is used as the first input end of the hysteresis comparison unit;
one end of the fourth resistor is connected to the negative electrode of the battery;
the inverting input end of the second comparator is used as the second input end of the hysteresis comparison unit;
the output end of the second comparator is connected with the other end of the third resistor, and the connection point is used as the output end of the hysteresis comparison unit.
6. The under-voltage battery output protection circuit of claim 1, wherein the control unit comprises: the first switch tube, the fifth resistor and the sixth resistor; wherein:
one end of the fifth resistor is used as the input end of the control unit, and the other end of the fifth resistor is connected with the control end of the first switching tube;
the first end of the first switch tube is connected with the negative electrode of the battery, and the second end of the first switch tube is connected with one end of the sixth resistor;
and the other end of the sixth resistor is used as the output end of the control unit.
7. The under-voltage battery output protection circuit of claim 1, wherein the switching unit comprises: the second switch tube, the seventh resistor and the voltage stabilizing unit; wherein:
one end of the seventh resistor is connected with the control end of the second switching tube and one end of the voltage stabilizing unit respectively, and the connection point is used as the input end of the switching unit;
the other end of the seventh resistor, the first end of the second switching tube and the other end of the voltage stabilizing unit are respectively connected to the anode of the battery;
and the second end of the second switching tube is used as the output end of the switching unit and is connected with a load.
8. The under-voltage battery protection circuit of claim 7, wherein the voltage regulator unit comprises: and two ends of the two voltage stabilizing diodes which are in positive and negative series connection are respectively used as two ends of the voltage stabilizing unit after series connection.
9. The under-voltage battery output protection circuit according to any one of claims 1 to 8, further comprising: and the voltage stabilizing power supply unit is used for supplying power to the comparison unit and/or supplying the threshold voltage.
10. The under-voltage battery output protection circuit of claim 9, wherein the regulated power supply unit comprises: an eighth resistor, a ninth resistor, a tenth resistor, a third zener diode and a capacitor; wherein:
one end of the eighth resistor is connected with the positive electrode of the battery;
the other end of the eighth resistor is respectively connected with one end of a ninth resistor, the cathode of the third voltage stabilizing diode and one end of the capacitor, and a connection point is used as a first output end of the voltage stabilizing power supply unit and supplies power to the comparison unit;
the other end of the ninth resistor is connected with one end of the tenth resistor, and a connection point is used as a second output end of the voltage-stabilized power supply unit and outputs the threshold voltage;
the other end of the tenth resistor, the anode of the third voltage stabilizing diode and the other end of the capacitor are respectively connected with the cathode of the battery.
CN202011551031.8A 2020-12-24 2020-12-24 Battery output undervoltage protection circuit Pending CN112653098A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011551031.8A CN112653098A (en) 2020-12-24 2020-12-24 Battery output undervoltage protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011551031.8A CN112653098A (en) 2020-12-24 2020-12-24 Battery output undervoltage protection circuit

Publications (1)

Publication Number Publication Date
CN112653098A true CN112653098A (en) 2021-04-13

Family

ID=75360100

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011551031.8A Pending CN112653098A (en) 2020-12-24 2020-12-24 Battery output undervoltage protection circuit

Country Status (1)

Country Link
CN (1) CN112653098A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202159973U (en) * 2011-07-07 2012-03-07 天津市松正电动汽车技术股份有限公司 Voltage detection protection circuit
CN206270863U (en) * 2016-08-29 2017-06-20 广东虹勤通讯技术有限公司 Cmos data remove device and computer
US20170250450A1 (en) * 2016-02-29 2017-08-31 Dongguan Nvt Technology Co., Ltd. Method and system for dynamically adjusting battery undervoltage protection
CN208753976U (en) * 2018-09-25 2019-04-16 武汉易德龙技术有限公司 A kind of under-voltage protecting circuit with lag function
CN209516621U (en) * 2019-02-01 2019-10-18 深圳市冠旭电子股份有限公司 Under-voltage protecting circuit and cell apparatus
CN209913482U (en) * 2018-12-05 2020-01-07 北京中科慧眼科技有限公司 Undervoltage protection circuit, binocular camera device and automatic driving system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202159973U (en) * 2011-07-07 2012-03-07 天津市松正电动汽车技术股份有限公司 Voltage detection protection circuit
US20170250450A1 (en) * 2016-02-29 2017-08-31 Dongguan Nvt Technology Co., Ltd. Method and system for dynamically adjusting battery undervoltage protection
CN206270863U (en) * 2016-08-29 2017-06-20 广东虹勤通讯技术有限公司 Cmos data remove device and computer
CN208753976U (en) * 2018-09-25 2019-04-16 武汉易德龙技术有限公司 A kind of under-voltage protecting circuit with lag function
CN209913482U (en) * 2018-12-05 2020-01-07 北京中科慧眼科技有限公司 Undervoltage protection circuit, binocular camera device and automatic driving system
CN209516621U (en) * 2019-02-01 2019-10-18 深圳市冠旭电子股份有限公司 Under-voltage protecting circuit and cell apparatus

Similar Documents

Publication Publication Date Title
CN104218531A (en) Short circuit protecting circuit and method
CN102570525A (en) PSoC (Programmable System on Chip)-based MPPT (Maximum Power Point Tracking) type solar charge controller
EP3826129A1 (en) Charging device and charging system
CN112653098A (en) Battery output undervoltage protection circuit
CN215378425U (en) Intelligent direct current power supply system
CN112994196B (en) Charging shunt power regulator
CN212258401U (en) Overvoltage protection circuit for storage battery
CN210427768U (en) Power supply access state detection circuit and electronic device
CN210161933U (en) Direct current-to-direct current integrated charger
CN211351688U (en) ACC trigger control's undervoltage protection circuit, two mesh camera devices and autopilot system
CN201174603Y (en) Solar inverter
CN216599035U (en) Low-temperature protection power supply circuit, rechargeable battery and electronic equipment
CN218071334U (en) Inverter and control circuit thereof
CN214204983U (en) Power supply of short circuit grounding fault indicator
CN211456788U (en) UPS power supply
CN218868210U (en) PMOS over-current protection control circuit
CN220172888U (en) Over-discharge protection circuit of lead-acid battery
CN212674898U (en) Power failure early warning circuit for water quality monitoring
CN220797822U (en) Battery discharging circuit
CN220399955U (en) Electronic label
CN218041201U (en) Power supply conversion circuit
CN221042339U (en) Charge-discharge protection circuit and electronic device
CN218997951U (en) Patch board with air switch
CN111697551B (en) Voltage protection circuit and electronic equipment
CN212231089U (en) Real standard platform surge suppression circuit of car

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20210413