CN110658468A - Battery state detection device - Google Patents
Battery state detection device Download PDFInfo
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- CN110658468A CN110658468A CN201910876824.8A CN201910876824A CN110658468A CN 110658468 A CN110658468 A CN 110658468A CN 201910876824 A CN201910876824 A CN 201910876824A CN 110658468 A CN110658468 A CN 110658468A
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- 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
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- 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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- 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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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Abstract
The embodiment of the invention discloses a battery state detection device, which is suitable for being respectively connected with a battery pack and a DC/DC conversion circuit and comprises a voltage comparator, a feedback control circuit and a state detection unit, wherein the DC/DC conversion circuit comprises an input end, a feedback end and an output end, the input end is connected to the battery pack, the feedback end is connected to the feedback control circuit, the output end is connected to the feedback control circuit, the state detection unit and electric equipment, and the voltage comparator is connected between the battery pack and the feedback control circuit; the voltage comparator is suitable for comparing the battery voltage with a reference voltage and outputting a switching signal; the feedback control circuit is suitable for receiving the output voltage and the switching signal and controlling the output feedback voltage based on the switching signal so as to control the output voltage; and the state detection unit is adapted to determine the battery state of the battery pack from the output voltage.
Description
Technical Field
The invention relates to the technical field of state detection, in particular to a battery state detection device.
Background
In industrial sites, many important key consumers are powered by batteries. For some electric equipment which is powered by batteries and has explosion-proof requirements, the batteries of the electric equipment must be isolated in a sealed explosion-proof box, and the box cannot be opened randomly so as to prevent electric sparks generated by the batteries from causing explosion accidents.
That is, the battery explosion-proof box and the electric equipment are independent from each other, and the battery cannot be directly connected with the rear-stage circuit. This ensures safety, but also prevents direct access to the battery state. Once the battery capacity is too low or the battery is damaged, the electric equipment cannot work normally, which may cause unpredictable loss. Therefore, it is important to detect the battery state.
At present, the service life of the battery is usually estimated by a worker according to the power consumption of the electric equipment and the use experience of the battery, and the battery is replaced periodically according to the estimated service life of the battery. This is not accurate and can be uncertain, but can also result in significant waste of resources (e.g., a replaced battery actually still has a large amount of remaining power).
It is therefore desirable to provide a more advanced battery state detection scheme.
Disclosure of Invention
To this end, embodiments of the present invention provide a battery status detection apparatus in an attempt to solve or at least alleviate the above-existing problems.
According to an aspect of the embodiments of the present invention, there is provided a battery state detection apparatus adapted to be connected to a battery pack and a DC/DC conversion circuit, respectively, the battery pack supplying power to a consumer via the DC/DC conversion circuit, the battery state detection apparatus including a voltage comparator, a feedback control circuit, and a state detection unit, the DC/DC conversion circuit including an input terminal, a feedback terminal, and an output terminal, the input terminal being connected to the battery pack, the feedback terminal being connected to the feedback control circuit, the output terminal being connected to the feedback control circuit, the state detection unit, and the consumer, the voltage comparator being connected between the battery pack and the feedback control circuit, wherein the DC/DC conversion circuit is adapted to receive a battery voltage of the battery pack via the input terminal, receiving a feedback voltage output by the feedback control circuit through a feedback end, and outputting an output voltage through an output end; the voltage comparator is suitable for comparing the battery voltage with a reference voltage and outputting a switching signal; the feedback control circuit is suitable for receiving the output voltage and the switching signal and controlling the output feedback voltage based on the switching signal so as to control the output voltage; and the state detection unit is adapted to determine the battery state of the battery pack from the output voltage.
Optionally, in an apparatus according to an embodiment of the present invention, the feedback control circuit includes a feedback circuit and a switching circuit, the feedback circuit includes a plurality of feedback branches, the switching circuit includes a plurality of switches and a control terminal, the control terminal is connected to the voltage comparator, the feedback branches are connected to the output terminal of the DC/DC conversion circuit and also connected to the feedback terminal of the DC/DC conversion circuit via the switches, and the switching circuit is adapted to control the on/off of the switches according to a switching signal, and turn on or off the connection between the feedback branches and the feedback terminal, so that the output voltage is changed.
Optionally, in the apparatus according to the embodiment of the present invention, the plurality of switches include a first switch and a second switch, the plurality of feedback branches include a first feedback branch and a second feedback branch, the first feedback branch is connected to the feedback terminal via the first switch, the second feedback branch is connected to the feedback terminal via the second switch, and the switching circuit is adapted to control the first switch and the second switch to be turned on or off according to the switching signal, and to turn on or off the connection between the first feedback branch and the feedback terminal and the connection between the second feedback branch and the feedback terminal, so that the output voltage varies.
Optionally, in the apparatus according to the embodiment of the present invention, the voltage comparator is adapted to output a high level signal in case that the battery voltage is greater than the reference voltage; and outputting a low level signal when the battery voltage is less than or equal to the reference voltage.
Optionally, in the apparatus according to the embodiment of the present invention, the switch circuit is adapted to turn on the connection between the first feedback branch and the feedback terminal when receiving a high level signal; and the second feedback branch circuit is also suitable for conducting the connection between the second feedback branch circuit and the feedback end when receiving a low-level signal.
Optionally, in the apparatus according to an embodiment of the present invention, the state detection unit is adapted to determine that the battery state is sufficiently charged when detecting that the output voltage is greater than a predetermined voltage value.
Alternatively, in the apparatus according to an embodiment of the present invention, the state detection unit is adapted to determine that the battery state is in a low charge state when detecting that the output voltage is equal to the predetermined voltage value.
Optionally, in the apparatus according to the embodiment of the present invention, a voltage dividing circuit is further included, and the battery pack is connected to the voltage comparator via the voltage dividing circuit.
Optionally, in the apparatus according to the embodiment of the present invention, the feedback branch includes two branch resistors, the output terminal of the DC/DC conversion circuit is sequentially connected to the ground terminal through the two branch resistors, and the feedback branch is connected to the corresponding switch through a connection point of the two branch resistors.
Optionally, in an apparatus according to an embodiment of the present invention, the voltage comparator includes an LM393 device.
Optionally, in an apparatus according to an embodiment of the invention, the switching circuit comprises a 74HC4051D device.
Optionally, in an apparatus according to an embodiment of the invention, the DC/DC conversion circuit comprises an MP2451DT device.
According to the battery state detection scheme provided by the embodiment of the invention, the battery voltage is compounded to the output voltage of the DC/DC conversion circuit through the voltage comparator and the feedback control circuit, so that the battery state of the battery pack can be accurately determined according to the output voltage of the DC/DC conversion circuit, and the problems that the electric equipment cannot work normally and resources are wasted are avoided. Secondly, the whole scheme has low cost, high reliability and simple operation. The output voltage output after the combination has small change amplitude, so that the power supply of a post-stage circuit and electric equipment is not influenced.
The foregoing description is only an overview of the technical solutions of the embodiments of the present invention, and the embodiments of the present invention can be implemented according to the content of the description in order to make the technical means of the embodiments of the present invention more clearly understood, and the detailed description of the embodiments of the present invention is provided below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present invention more clearly understandable.
Drawings
To the accomplishment of the foregoing and related ends, certain illustrative aspects are described herein in connection with the following description and the annexed drawings, which are indicative of various ways in which the principles disclosed herein may be practiced, and all aspects and equivalents thereof are intended to be within the scope of the claimed subject matter. The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description read in conjunction with the accompanying drawings. Throughout this disclosure, like reference numerals generally refer to like parts or elements.
FIG. 1 shows a schematic diagram of a power supply system 100 according to one embodiment of the invention;
FIG. 2 shows a schematic diagram of a battery state detection apparatus 200 according to one embodiment of the present invention;
FIG. 3 shows a circuit schematic of a battery state detection apparatus 200 according to one embodiment of the present invention; and
fig. 4 shows a graph of output voltage versus battery voltage according to an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Fig. 1 shows a schematic diagram of a power supply system 100 according to an embodiment of the invention. As shown in fig. 1, the power supply system 100 may include a battery pack 110, a DC/DC conversion circuit 120, a battery state detection apparatus 200, and a power-using device 130. In other embodiments, the power supply system 100 may include different and/or additional modules.
The battery pack 110 can output a battery voltage VBATAnd supplies power to the electric device 130 via the DC/DC conversion circuit 120. The DC/DC conversion circuit 120 may include an input terminal 121, an output terminal 122, and a feedback terminal 123. The input terminal 121 is connected to the battery pack 110 and is adapted to receive a battery voltage VBAT. The output terminal 122 is connected to the electric device 130 and adapted to output an output voltage VCCTo power the consumer 123. The feedback terminal 123 is adapted to be connected to the battery status detecting device 200, and is adapted to receive the feedback voltage V output by the battery status detecting device 200FB。
In some embodiments, the DC/DC conversion circuit 120 may be implemented as an MP2451DT device. The specific implementation circuit will be described in detail later in conjunction with fig. 3.
The battery state detection device 200 is respectively connected to the battery pack 110 and the output terminal 122 and the feedback terminal 123 of the DC/DC conversion circuit 120, and is adapted to receive the battery voltage V of the battery packBATAnd the output voltage V of the DC/DC conversion circuit 120CCAnd outputs a feedback voltage VFB。
The battery state detection device 200 may compound the battery voltage to the output voltage of the DC/DC conversion circuit so that the battery state of the battery pack may be determined according to the output voltage of the DC/DC conversion circuit. It is understood that as the amount of power is consumed, the battery voltage tends to decrease. Therefore, the output voltage output after the combination can stably present the battery state of the battery pack. In addition, the output voltage output after the combination has limited change amplitude, and has no influence on the power supply of a rear-stage circuit and electric equipment.
Fig. 2 shows a schematic diagram of a battery state detection apparatus 200 according to an embodiment of the present invention. As shown in fig. 2, the battery state detection apparatus 200 may include a voltage comparator 210, a feedback control circuit 220, and a state detection unit 230.
The voltage comparator 210 is connected between the battery pack 110 and the feedback control circuit 220, and is adapted to receive the battery voltage V output by the battery pack 110BATWill beVoltage V of the batteryBATAnd a reference voltage VREFPerforms the comparison and then outputs a switching signal to the feedback control circuit 220.
Specifically, the voltage comparator 210 may include a non-inverting input terminal, an inverting input terminal, a signal output terminal, a power supply terminal, and a ground terminal. The non-inverting input terminal is connected to the battery pack 110 and adapted to receive the battery voltage VBAT. The inverting input terminal is adapted to receive a reference voltage VREFThe reference voltage VREFCan be based on the operating voltage VDDThus obtaining the product. The signal output terminal is connected to the feedback control circuit 220 and adapted to output a switching signal. The power end is connected to the working power supply and is suitable for receiving the working voltage VDD. The ground terminal is connected to ground.
The switching signal may include a high level signal and a low level signal. Generally, the voltage comparator 210 may be at the battery voltage VBATGreater than a reference voltage VREFIn the case of (1), a high level signal is output at the battery voltage VBATIs less than or equal to the reference voltage VREFIn the case of (2), a low level signal is output.
In some embodiments, voltage comparator 210 may be implemented by an LM393 device. The specific implementation circuit will be described in detail later in conjunction with fig. 3.
According to an embodiment of the present invention, the battery status detecting apparatus 200 may further include a voltage dividing circuit 260 (not shown in fig. 2). The battery pack 110 may be connected to the voltage comparator 210 via the voltage dividing circuit 260, and the voltage comparator 210 receives the divided battery voltage VBAT. In some embodiments, the voltage divider circuit 260 may include a plurality of voltage divider resistors, and a specific implementation circuit thereof will be described in detail later in conjunction with fig. 3.
The feedback control circuit 220 is connected to the voltage comparator 210, and the feedback terminal 123 and the output terminal 122 of the DC/DC conversion circuit 120, respectively, and is adapted to receive the output voltage of the DC/DC conversion circuit 120 and the switching signal of the voltage comparator 210 and output a feedback voltage VFBTo the DC/DC conversion circuit 120. Wherein the feedback control circuit 220 can control the feedback voltage V output by the feedback control circuit based on the switching signalFBTo control the output voltage VCC。
Specifically, the feedback control circuit 220 may include a feedback circuit 240 and a switching circuit 250. The feedback circuit 240 includes a plurality of feedback branches, and the switching circuit 250 includes a control terminal 253 and a plurality of switches. The switch circuit 250 includes switches corresponding to the feedback branches of the feedback circuit 240.
The control terminal 253 of the switching circuit 250 is connected to the voltage comparator 210. The feedback circuit 240 includes feedback branches each connected to the output terminal 122 of the DC/DC conversion circuit 120 and connected to the feedback terminal 123 of the DC/DC conversion circuit 120 via a corresponding switch.
The switch circuit 250 is adapted to receive the switch signal and control the on/off of each switch according to the switch signal to connect or disconnect each feedback branch with the feedback terminal 123 of the DC/DC conversion circuit 120, so that the output voltage V is outputCCA change is made. Each feedback branch is adapted to receive the output voltage V of the DC/DC conversion circuit 120CCAnd outputs a feedback voltage V when the corresponding switch is turned onFBTo the DC/DC conversion circuit 120.
As further shown in fig. 2, in some embodiments, the plurality of switches may include a first switch 251 and a second switch 252. The plurality of feedback branches may include a first feedback branch 241 and a second feedback branch 242. The first feedback branch 241 is connected to the feedback terminal 123 of the DC/DC conversion circuit 120 via a first switch 251, and the second feedback branch 242 is connected to the feedback terminal 123 of the DC/DC conversion circuit 120 via a second switch 252. The switching circuit 250 controls the on/off of the first switch 251 and the second switch 252 according to the switching signal, and turns on or off the connection between the first feedback branch 241 and the feedback end 123 and the connection between the second feedback branch 242 and the feedback end 123, so that the output voltage V is outputCCA change is made.
For example, the switch circuit 250 may turn on the first switch 251 and turn off the second switch 252 when receiving a high-level signal, thereby turning on the connection between the first feedback branch 241 and the feedback terminal 123 and turning off the connection between the second feedback branch 242 and the feedback terminal 123. The switch circuit 250 may further turn off the first switch 251 and turn on the second switch 252 when receiving the low level signal, thereby turning off the connection between the first feedback branch 241 and the feedback terminal 123 and turning on the connection between the second feedback branch 242 and the feedback terminal 123.
According to an embodiment of the present invention, the feedback branches (e.g., the first feedback branch, the second feedback branch) may generally include a plurality of branch resistances, and a specific implementation circuit thereof will be described in detail later with reference to fig. 3.
The state detection unit 230 is connected to the output terminal 122 of the DC/DC conversion circuit 120 and is adapted to receive the output voltage V of the DC/DC conversion circuit 120CCAnd according to the output voltage VCCThe battery state of the battery pack 110 is determined. In particular, the output voltage V may be detectedCCGreater than the initial voltage value V1Then, the battery state of the battery pack 110 is determined to be sufficiently charged. The output voltage V can be detectedCCLess than or equal to a predetermined voltage value V2Then, the battery state of the battery pack 110 is determined as being low. Wherein the initial voltage value V1Greater than a predetermined voltage value V2。
In some embodiments, when it is determined that the battery status is insufficient, the status detection unit 230 may further send an alarm to remind a worker to replace the battery in time, so as to ensure that the electrical device works normally.
Fig. 3 shows a schematic circuit diagram of a battery state detection apparatus 200 according to an embodiment of the present invention. As shown in fig. 3, the negative terminal of the battery pack 110 is grounded, and the positive terminal is connected to the input terminal 121 of the DC/DC converter circuit 120. The DC/DC conversion circuit 120 is implemented as an MP2451DT device, and the MP2451DT device includes an input terminal 121(IN), an enable terminal EN, a ground terminal GND, a feedback terminal 123(FB), a bootstrap terminal BST, and a source output terminal SW. The input 121(IN) of the MP2451DT device is connected to the positive terminal of the battery 110. A first resistor R is connected between the input terminal 121(IN) and the enable terminal EN of the MP2451DT device1A ground terminal GND is connected to ground, and a first capacitor C is connected between the bootstrap terminal BST and the source output terminal SW1The source output terminal SW is connected to the Schottky diode D1Is connected to ground. The source output terminal SW is also connected to the first inductor L1Is connected to the output 122 of the DC/DC conversion circuit 120. The output 122 of the DC/DC converter circuit 120 is further via a second capacitor C2Is connected to groundAnd is adapted to output the output voltage Vcc.
The positive electrode of the battery pack 110 is also connected to a voltage divider circuit 260. The voltage dividing circuit 260 includes a voltage dividing resistor R2And a voltage dividing resistor R3. The positive electrode of the battery pack 110 is connected to the voltage dividing resistor R2Is connected to the non-inverting input 211 of the voltage comparator 210. Voltage dividing resistor R2One end connected to the non-inverting input terminal 211 is connected to the output terminal via a voltage dividing resistor R3Is connected to ground.
The voltage comparator 210 is implemented as an LM393 device including a non-inverting input (+), an inverting input (-), a signal output (O), a power terminal (V +) and a ground terminal (GND). The power end (V +) is connected to the working power supply and is suitable for receiving the working voltage VDD. The ground terminal is connected to ground. The inverting input (-) via a fourth resistor R4Connected to a working power supply and via a fifth resistor R5Is connected to ground. The signal output (O) is connected to the switching circuit 250 of the feedback control circuit 220.
The switching circuit 250 is implemented as a 74HC4051D device. The 74HC4051D device is an eight-out-one analog switch circuit having 3 address select terminals ADDA, ADDB, ADDC, an active low enable input terminal8 independent input/output terminals NO 0-NO 7 and a common input/output terminal COM. Here, the address selection terminal ADDC is the control terminal 253 of the switch circuit 250, the input/output terminal NO1 and the common input/output terminal COM constitute the first switch 251, and the input/output terminal NO0 and the common input/output terminal COM constitute the second switch 252.
The address select terminal ADDA of the 74HC4051D device is connected to the signal output terminal (O) of the LM393 device, the address select terminals ADDB, ADDC and the enable input terminalTo ground, the input/output terminal NO1 is connected to the first feedback branch 241, the input/output terminal NO0 is connected to the second feedback branch 242, and the common input/output terminal COM is connected to the feedback terminal 123(FB) of the MP2451DT device.
First of allThe feedback branch 241 includes a branch resistor R6And branch resistance R7The second feedback branch 241 includes a branch resistor R8And branch resistance R9. The output 122 of the DC/DC converter circuit 120 is connected via a branch resistor R6And branch resistance R7Is connected to the ground terminal and is also connected to the ground terminal through a branch resistor R8And branch resistance R9Is connected to ground. Branch circuit resistor R6And branch resistance R7Is connected with the input/output terminal NO1, the branch resistance R8And branch resistance R9Is connected to the input/output terminal NO 0.
When the battery voltage VBATWhen the charge is sufficient, e.g. at battery voltage VBATGreater than a reference voltage VREFIn the case of (2), the voltage comparator 210 outputs a high level signal. The 74HC4051D device receives a high signal, which connects the input/output NO1 to the common input/output COM, disconnects the input/output NO0 from the common input/output COM, connects the first feedback branch 241 and disconnects the second feedback branch 242. Output voltage V output from output terminal 122 of DC/DC conversion circuit 120CCMay be an initial voltage value V1。
When the battery voltage VBATWhen the quantity of electricity is insufficient, e.g. battery voltage VBATDown to less than or equal to the reference voltage VREFIn the case of (2), the voltage comparator 210 outputs a low level signal. The 74HC4051D device receives the low level signal, so that the input/output terminal NO1 is disconnected from the common input/output terminal COM, the input/output terminal NO0 is connected to the common input/output terminal COM, the first feedback branch 241 is disconnected, and the second feedback branch 242 is connected. Output voltage V output from output terminal 122 of DC/DC conversion circuit 120CCIs reduced to a predetermined voltage value V2。
FIG. 4 shows an output voltage V according to an embodiment of the inventionCCDependent on the battery voltage VBATGraph of the variation of (c). As shown in fig. 4, when the battery voltage V is appliedBATIs always kept at VBAT0Time-out output voltage VCCIs maintained at V1. When the battery voltage VBATDown to VREFTime, output voltage VCCDown to V2。
The state detection unit 230 detects the output voltage VCCGreater than a predetermined voltage value V1When the battery is in a sufficient state, the output voltage V is detectedCCEqual to a predetermined voltage value V1And then determining that the battery state is insufficient.
In summary, the battery state detection apparatus according to the embodiment of the present invention can combine the battery voltage with the output voltage of the DC/DC conversion circuit, so that the battery state of the battery pack can be accurately determined according to the output voltage of the DC/DC conversion circuit, and the abnormal operation of the electrical device and the waste of resources are avoided. Secondly, low cost, high reliability and simple operation. The output voltage output after the combination has small change amplitude, so that the power supply of a post-stage circuit and electric equipment is not influenced.
The various techniques described herein may be implemented in connection with hardware or software or, alternatively, with a combination of both. Thus, the methods and apparatus of embodiments of the present invention, or certain aspects or portions thereof, may take the form of program code (i.e., instructions) embodied in tangible media, such as removable hard drives, U.S. disks, floppy disks, CD-ROMs, or any other machine-readable storage medium, wherein, when the program is loaded into and executed by a machine, such as a computer, the machine becomes an apparatus for practicing embodiments of the invention.
In the case of program code execution on programmable computers, the computing device will generally include a processor, a storage medium readable by the processor (including volatile and non-volatile memory and/or storage elements), at least one input device, and at least one output device. Wherein the memory is configured to store program code; the processor is configured to perform the methods of embodiments of the present invention according to instructions in the program code stored in the memory.
By way of example, and not limitation, readable media may comprise readable storage media and communication media. Readable storage media store information such as computer readable instructions, data structures, program modules or other data. Communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media. Combinations of any of the above are also included within the scope of readable media.
In the description provided herein, algorithms and displays are not inherently related to any particular computer, virtual system, or other apparatus. Various general purpose systems may also be used with examples of embodiments of the invention. The required structure for constructing such a system will be apparent from the description above. In addition, embodiments of the present invention are not directed to any particular programming language. It is appreciated that a variety of programming languages may be used to implement the teachings of embodiments of the present invention as described herein, and any descriptions of specific languages are provided above to disclose the best modes of embodiments of the invention.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that is, the claimed embodiments of the invention require more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of an embodiment of this invention.
Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in a device as described in this embodiment or alternatively may be located in one or more devices different from the devices in this example. The modules in the foregoing examples may be combined into one module or may be further divided into multiple sub-modules.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
The present invention may further comprise: a11, the apparatus as claimed in any one of a1-10, wherein the switching circuit includes a 74HC4051D device. A12 the apparatus of any one of A1-11, wherein the DC/DC conversion circuit comprises an MP2451DT device.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of and form different embodiments of the invention. For example, in the following claims, any of the claimed embodiments may be used in any combination.
Furthermore, some of the above embodiments are described herein as a method or combination of elements of a method that can be performed by a processor of a computer system or by other means for performing the functions described above. A processor having the necessary instructions for carrying out the method or method elements described above thus forms a means for carrying out the method or method elements. Furthermore, the elements of the apparatus embodiments described herein are examples of the following apparatus: the apparatus is used to implement the functions performed by the elements for the purpose of carrying out the invention.
As used herein, unless otherwise specified the use of the ordinal adjectives "first", "second", "third", etc., to describe a common object, merely indicate that different instances of like objects are being referred to, and are not intended to imply that the objects so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.
While embodiments of the invention have been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the embodiments of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive embodiments. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The present embodiments are disclosed by way of illustration and not limitation, the scope of embodiments of the invention being defined by the appended claims.
Claims (10)
1. A battery state detection device is suitable for being respectively connected with a battery pack and a DC/DC conversion circuit, wherein the battery pack supplies power for electric equipment through the DC/DC conversion circuit, the battery state detection device comprises a voltage comparator, a feedback control circuit and a state detection unit,
the DC/DC conversion circuit comprises an input end, a feedback end and an output end, wherein the input end is connected to the battery pack, the feedback end is connected to the feedback control circuit, the output end is connected to the feedback control circuit, the state detection unit and the electric equipment, the voltage comparator is connected between the battery pack and the feedback control circuit, the DC/DC conversion circuit comprises an input end, a feedback end and an output end, the input end is connected to the battery pack, the feedback end is connected to the feedback
The DC/DC conversion circuit is suitable for receiving the battery voltage of the battery pack through the input end, receiving the feedback voltage output by the feedback control circuit through the feedback end and outputting the output voltage through the output end;
the voltage comparator is suitable for comparing the battery voltage with a reference voltage and outputting a switching signal;
the feedback control circuit is suitable for receiving the output voltage and the switching signal and controlling the output feedback voltage based on the switching signal so as to control the output voltage; and
the state detection unit is adapted to determine a battery state of the battery pack from the output voltage.
2. The apparatus of claim 1, wherein the feedback control circuit comprises a feedback circuit and a switching circuit, the feedback circuit comprising a plurality of feedback branches, the switching circuit comprising a plurality of switches and a control terminal, the control terminal being connected to the voltage comparator, the feedback branches being connected to the output terminal of the DC/DC conversion circuit and further connected to the feedback terminal of the DC/DC conversion circuit via the switches,
the switch circuit is suitable for controlling the on-off of the switch according to the switch signal, and the connection between the feedback branch and the feedback end is switched on or switched off, so that the output voltage is changed.
3. The apparatus of claim 2, wherein the plurality of switches comprises a first switch and a second switch, the plurality of feedback branches comprises a first feedback branch and a second feedback branch, the first feedback branch is connected to the feedback terminal via the first switch, the second feedback branch is connected to the feedback terminal via the second switch,
the switch circuit is suitable for controlling the on-off of the first switch and the second switch according to the switch signal, and conducting or cutting off the connection between the first feedback branch and the feedback end and the connection between the second feedback branch and the feedback end, so that the output voltage is changed.
4. The apparatus of claim 3, wherein the voltage comparator is adapted to output a high level signal if the battery voltage is greater than the reference voltage; outputting a low level signal if the battery voltage is less than or equal to the reference voltage.
5. The apparatus of claim 4, wherein the switching circuit is adapted to conduct the connection between the first feedback branch and the feedback terminal when receiving a high level signal; and the second feedback branch circuit is also suitable for conducting the connection between the second feedback branch circuit and the feedback end when receiving a low level signal.
6. The apparatus of claim 1, wherein the state detection unit is adapted to determine that the battery state is sufficiently charged when detecting that the output voltage is greater than a predetermined voltage value.
7. The apparatus of claim 6, wherein the state detection unit is adapted to determine that the battery state is low when detecting that the output voltage is equal to a predetermined voltage value.
8. The apparatus of claim 1, further comprising a voltage divider circuit, the battery pack being connected to the voltage comparator via the voltage divider circuit.
9. The apparatus of claim 2, wherein the feedback branch comprises two branch resistors, the output terminal of the DC/DC conversion circuit is connected to ground via the two branch resistors in turn, and the feedback branch is connected to the corresponding switch via the connection point of the two branch resistors.
10. The apparatus of any one of claims 1-9, wherein the voltage comparator comprises an LM393 device.
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| CN114172122A (en) * | 2022-02-09 | 2022-03-11 | 深圳市创芯微微电子有限公司 | Battery protection circuit and overcurrent protection circuit |
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