Optical feedback communication method and battery management system for performing same

Abstract

Disclosed is a battery management system including: a light receiving unit for generating a voltage based on light having communication information received from an external battery management system; a light emission unit for transmitting light having communication information to an external battery management system; and a control unit. The control unit determines a voltage value generated by the light receiving unit according to an intensity of the light received from the external battery management system, the voltage value being determined based on the intensity of the light received from the external battery management system, and adjusts an intensity of the light transmitted from the light emitting unit, the intensity being adjusted based on the determined voltage value.

Description

Technical Field

[0001] This disclosure relates to an optical feedback communication method and a battery management system for performing the optical feedback communication method. Background Technology

[0002] Battery management systems (BMS) are used to control batteries efficiently and smoothly. For example, BMS uses sensors to measure the current, voltage, or temperature of batteries in battery electric vehicles (BEVs), energy storage systems (ESS), and other devices and systems, and appropriately uses this measured information to control the battery's lifespan, performance, and safety, thereby ensuring that the battery operates at its best performance.

[0003] To achieve optimal battery performance, multiple battery management systems need to exchange data and various information with each other via wired and / or wireless communication. Summary of the Invention

[0004] Technical goals

[0005] The technical tasks to be achieved in this example embodiment are not limited to those described above, and other technical tasks can be inferred from the following example embodiments.

[0006] Technical solution

[0007] A battery management system according to an embodiment includes: a light receiving unit configured to generate a voltage based on light received from an external battery management system and containing communication information; a light emitting unit configured to transmit light containing communication information to the external battery management system; and a control unit configured to check a voltage value of the voltage generated by the light receiving unit based on the intensity of the light received from the external battery management system, and to adjust the intensity of the light transmitted from the light emitting unit based on the checked voltage value.

[0008] When the intensity of light received from the external battery management system decreases, the control unit can control the intensity of light sent from the light emitting unit to the external battery management system to increase.

[0009] The control unit can adjust the intensity of the light emitted from the light emitting unit to the external battery management system so that the voltage value being checked is equal to the specified target voltage value.

[0010] A specified target voltage value can be determined based on the power consumed in communication between the battery management system and the external battery management system.

[0011] The control unit may include: a first operational amplifier configured to compare the checked voltage value with a specified target voltage value and output a duty cycle voltage signal; pulse width modulation (PWM) logic circuitry configured to determine the duty cycle of the duty cycle voltage signal; a gate driver circuitry connected to the PWM logic circuitry and configured to control the duty cycle; a buck-boost converter circuitry connected to the gate driver circuitry and configured to output a feedback voltage signal based on the drive voltage and the duty cycle; and a negative feedback circuitry including a second operational amplifier and a MOSFET element to provide a feedback voltage signal to the light emitting unit.

[0012] The first operational amplifier can increase in power as the difference between the checked voltage value and the specified target voltage value increases, and outputs a duty cycle voltage signal.

[0013] If the duty cycle is increased, the buck-boost converter circuit can increase and output a feedback voltage signal.

[0014] The negative feedback circuit can provide a feedback voltage signal to the light emitting unit based on the current flowing through the MOSFET element.

[0015] The MOSFET element can be a PMOS element, and the second operational amplifier can apply a feedback voltage signal to the drain terminal of the PMOS element.

[0016] An optical feedback communication method for a battery management system according to an embodiment includes: generating a voltage based on light received from an external battery management system and containing communication information; checking the voltage value of the voltage generated by a light receiving unit based on the intensity of the light received from the external battery management system; adjusting the intensity of light emitted from a light emitting unit based on the checked voltage value; and transmitting the light containing the communication information to the external battery management system.

[0017] Details of the embodiments are included in the detailed description and the accompanying drawings.

[0018] Effects of the present invention

[0019] According to the optical feedback communication method disclosed herein, even when the communication performance between the battery management system and the external battery management system is sensed to degrade over time, the intensity of the light used for communication between the battery management system and the external battery management system can be maintained at a constant level according to the optical feedback communication method that applies a negative feedback method, thereby ensuring that the communication state can be maintained smoothly.

[0020] The effects of the various embodiments of this disclosure are not limited to those described above, and other effects not mentioned will be clearly understood by those skilled in the art as described in the claims. Attached Figure Description

[0021] The accompanying drawings illustrate embodiments of the present disclosure and, together with the detailed description of the present disclosure that follows, are intended to aid in a further understanding of the technical concepts of the present disclosure. Therefore, the present disclosure should not be construed as limited to what is shown in the drawings.

[0022] Figure 1 This is a diagram illustrating the concept of a system for implementing an optical feedback communication method between battery management systems according to an embodiment.

[0023] Figure 2 This is a block diagram illustrating the structure of a battery management system that performs optical feedback wireless communication according to an embodiment.

[0024] Figure 3a and Figure 3b These are diagrams illustrating the overall optical feedback process between the battery management system and the external battery management system according to an embodiment.

[0025] Figure 4a and Figure 4b This is a diagram illustrating the control unit of the battery management system according to an embodiment.

[0026] Figure 5 This is a flowchart illustrating the operation of a battery management system that performs optical feedback wireless communication according to an embodiment.

[0027] Figure 6 This is a block diagram illustrating the hardware configuration of a control unit included in a battery management system according to an embodiment.

[0028] In some of the accompanying drawings, corresponding parts have the same reference numerals. Those skilled in the art will understand that the drawings simply and clearly illustrate the elements and are not necessarily drawn to scale. For example, to aid in understanding the various embodiments, the dimensions of some elements shown in the drawings may be exaggerated compared to other elements. Furthermore, to avoid hindering the understanding of the spirit of the various embodiments of this disclosure, elements that are useful or necessary in commercially feasible embodiments but are known in the art may generally not be described. Detailed Implementation

[0029] While considering the functions in this disclosure, the terminology used in the embodiments has been selected as far as possible from commonly used general terms; however, these terms may vary depending on the intent of those skilled in the art, precedents, the emergence of new technologies, etc. Furthermore, in some cases, terms arbitrarily chosen by the applicant exist, and in such cases, their meanings will be described in detail in the relevant descriptive sections. Therefore, the terminology used in this disclosure should be defined based on the meaning of the terms and the overall content of this disclosure, and not merely on the names of the terms.

[0030] When a section in the instruction manual says that a certain part “includes” a certain component, unless otherwise specified, it means that other components may be included, rather than excluding other components.

[0031] The expression “at least one of a, b and c” used throughout the specification may encompass “a alone”, “b alone”, “c alone”, “a and b”, “a and c”, “b and c” or “all of a, b and c”.

[0032] The term "terminal" as used below can be implemented as a computer or portable terminal capable of connecting to a server or other terminal via a network. Here, a computer may include, for example, a laptop computer, a desktop computer, a laptop computer, or other computers equipped with a web browser, and a portable terminal may include, for example, any type of handheld wireless communication device that ensures portability and mobility, such as communication-based terminals (such as International Mobile Telecommunications (IMT), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (W-CDMA), and Long Term Evolution (LTE)), smartphones, tablet PCs, and other similar devices.

[0033] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, enabling those skilled in the art to readily implement the present disclosure. However, the present disclosure may be implemented in various different forms and is not limited to the embodiments described herein.

[0034] A battery management system (BMS) can be installed in units such as battery packs, battery modules, and individual battery cells. These battery management systems communicate with each other to ensure that the battery packs, battery modules, and individual battery cells are managed to operate in a stable manner.

[0035] Among communication methods used between battery management systems, wireless communication offers advantages not only in communication quality but also in system simplification. In such wireless communication between battery management systems, optical communication methods can be used, for example, employing photodiodes as light-emitting elements and photodiodes as light-receiving elements. While optical communication methods using these light-emitting and light-receiving elements have many advantages, communication quality can deteriorate due to aging of these elements, dust, condensation, and other factors that weaken their light transmission capabilities. For example, when communication performance degrades due to performance degradation caused by the use of photodiodes, it may be difficult for the battery management system to detect this degradation and maintain communication performance.

[0036] Various embodiments of this disclosure utilize optical feedback to provide a battery management system and communication method that maintains constant communication quality even when optical transmission capabilities are degraded due to component aging, dust, or condensation.

[0037] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0038] Figure 1 This is a diagram illustrating the concept of a system for implementing an optical feedback communication method between battery management systems according to an embodiment.

[0039] refer to Figure 1 The system 101 that performs the optical feedback communication method according to the embodiment may include a battery management system (BMS) 100 that performs optical feedback communication control and an external battery management system 200 that communicates with the battery management system 100.

[0040] As used herein, the term "external battery management system 200" refers to a battery management system that is in communication with a battery management system 100 that performs optical feedback communication control according to various embodiments of the present disclosure, regardless of its physical location. For example, it may be assumed that there is communication between the BMS of a battery pack and the BMS of a particular battery module included in the pack, and it may be assumed that the BMS of the battery pack is the battery management system 100, and that the BMS of the particular battery module is the external battery management system 200.

[0041] Various embodiments of this disclosure aim to maintain communication performance between the battery management system 100 and the external battery management system 200 through optical feedback. For example, the battery management system 100 according to various embodiments of this disclosure provides a method that, even when the intensity of light received at the light receiving unit 210 decreases due to the cumulative use of the light emitting unit 130, resulting in a decrease in the intensity of light received by the light receiving unit 210 of the external battery management system 200, the method can maintain communication performance by increasing the intensity of light transmitted from the light emitting unit 230 of the external battery management system 200 to the external battery management system 200 after the light is received by the light receiving unit 110 of the battery management system 100. In this way, various embodiments of this disclosure utilize an optical feedback control method, and even when dust accumulates on each of the light emitting units 130, 230 and the light receiving units 110, 210 as communication cycles between the battery management systems increase, the communication performance between the battery management system 100 and the external battery management system 200 can be maintained through a negative feedback method.

[0042] Although the examples described above assume that the light intensity is reduced due to the cumulative use of the light emitting unit 130 of the battery management system 100, the various embodiments of this disclosure are not limited thereto, and can be similarly applied, for example, to the case where the light intensity is reduced due to the cumulative use of the light emitting unit 230 of the external battery management system 200.

[0043] Figure 2 This is a block diagram illustrating the structure of a battery management system that performs optical feedback via wireless communication according to an embodiment.

[0044] refer to Figure 2 According to an embodiment, the battery management system 100 may include: a light receiving unit 110 that generates a voltage based on light containing communication information received from an external battery management system 200; a control unit 120; and a light emitting unit 130 that transmits light containing communication information to the external battery management system 200. Figure 2 The battery management system 100 shown only illustrates components relevant to this embodiment. Therefore, those skilled in the art related to this embodiment will understand that, in addition to... Figure 2 In addition to the components shown, other general-purpose components may also be included.

[0045] In an embodiment, the light receiving unit 110 of the battery management system 100 can receive optical signals (light) transmitted from the light emitting unit 230 of the external battery management system 200, and can generate a voltage based on the received light. The light receiving unit 110 of the battery management system 100 may include one or more photodiodes corresponding to semiconductor diodes, which, according to an embodiment, serve as photodetectors. The photodiodes included in the light receiving unit 110 may have a PN junction or PIN structure, such that when light with sufficient photon energy is incident on the photodiode, mobile electrons and positively charged holes are generated, resulting in the generation of a photocurrent through the activity of electrons. The current generated in this way can generate a voltage based on the intensity of light flowing through a resistor. Meanwhile, in the description of this disclosure, the terms "optical signal" and "light" are used interchangeably herein with the same meaning.

[0046] In an embodiment, the control unit 120 may be configured to check (e.g., sense) the voltage value of the voltage generated by the light receiving unit 110 in response to an optical signal transmitted from the external battery management system 200, based on the intensity of light received from the external battery management system 200, and the control unit 120 adjusts the intensity of light transmitted from the light emitting unit 130 to the external battery management system 200 based on the checked voltage value. For example, when the intensity of light received from the external battery management system 200 decreases, the control unit 120 of the battery management system 100 may control the intensity of light transmitted from the light emitting unit 130 to the external battery management system 200 to increase. For example, the control unit 120 of the battery management system 100 may check the voltage value of the voltage generated by the light receiving unit 110 based on the intensity of light received from the external battery management system 200, and the control unit 120 may adjust the intensity of light transmitted from the light emitting unit 130 to the external battery management system 200 such that the voltage value corresponding to the intensity of light received from the external battery management system 200 is equal to a specified target voltage value. In this case, according to the embodiment, the specified target voltage value can be determined based on the power consumption of communication between the battery management system 100 and the external battery management system 200, or it can be determined based on the minimum power consumption required to maintain wireless communication between the battery management system 100 and the external battery management system 200.

[0047] In one embodiment, the light emitting unit 130 of the battery management system 100 can transmit light containing communication information to an external battery management system 200. The light emitting unit 130 of the battery management system 100 may include one or more photodiodes corresponding to semiconductor diodes, which serve as photodetectors, similar to the light receiving unit 110 described above, and can transmit light with appropriate intensity to the external battery management system 200 to perform optical feedback under the control of the control unit 120 from the battery management system 100.

[0048] Figure 3a and Figure 3b This is a diagram illustrating the overall optical feedback process between the battery management system 100 and the external battery management system 200 according to an embodiment.

[0049] refer to Figure 3a According to an embodiment, when the battery management system 100 and the external battery management system 200 exchange signals with each other, the overall optical feedback process within the battery management system 100 can be confirmed.

[0050] First, the control unit 120 of the battery management system 100 can generate a desired target voltage value 411 based on the communication power consumption for communication between the battery management system 100 and the external battery management system 200. The target voltage value 411 can then be compared with a voltage value 412 that has been checked based on light received by the light receiving unit 110 of the battery management system 100, and the comparison result is sent to a negative feedback circuit 450 within the control unit 120. The negative feedback circuit 450 can appropriately change the intensity of light transmitted from the light emitting unit 130 of the battery management system 100 to the external battery management system 200 via a current 470 reflecting a feedback voltage signal generated based on the comparison result between the target voltage value 411 set in the control unit 120 based on communication power consumption and the voltage value 412 checked based on the light received by the light receiving unit 110. As a result of this negative feedback operation, the voltage value 412 received by the light receiving unit 110 of the battery management system 100, based on the voltage generated from the light received from the external battery management system 200, can be controlled to be equal to the target voltage value 411.

[0051] Through the negative feedback operation described above, even when the strength of the wireless communication signal between the battery management system 100 and the external battery management system 200 weakens, causing the checked voltage value 412 to drop, the battery management system 100 can ensure that the voltage value 412 checked by the light receiving unit 110 of the battery management system 100 remains equal to the target voltage value 411. The operations performed by each component in the above-described optical feedback process will be described below.

[0052] Figure 3b This is a diagram illustrating the overall process occurring within the external battery management system 200 during the process of the battery management system 100 receiving light from the external battery management system 200 according to an embodiment.

[0053] refer to Figure 3bThe photodiode 310 included in the light receiving unit 210 of the external battery management system 200 can receive light containing communication information from the light emitting unit 130 of the battery management system 100. When the intensity of the light received by the light receiving unit 210 of the external battery management system 200 decreases due to dust accumulation, for example, on the photodiode in the light emitting unit 130 of the battery management system 100 or on the photodiode 310 included in the light receiving unit 210 of the external battery management system 200, the current 315 flowing through the photodiode 310 of the light receiving unit 210 driven by the driving voltage (VDD) 330 can decrease. As the degree of voltage drop caused by the light receiving unit resistor 320 due to the decrease in the current 315 flowing through the photodiode 310 of the light receiving unit 210 of the external battery management system 200 decreases, the light receiving unit voltage 325 can also decrease. The decrease in the light receiving unit voltage 325 of the external battery management system 200 can be transmitted to the light emitting unit 230 connected to the light receiving unit 210 of the external battery management system 200. As a result, the intensity of the light containing communication information transmitted from the light emitting unit 230 of the external battery management system 200 and received by the light receiving unit 110 of the battery management system 100 can be reduced, and the voltage generated by the light receiving unit 110 of the battery management system 100 can also be lower. Through these changes, the control unit 120 of the battery management system 100 can sense that the intensity of the light used for communication between the battery management system 100 and the external battery management system 200 has weakened, and can control the light emitting unit 130 of the battery management system 100 through appropriate compensation to ensure that an appropriate light intensity is transmitted to the external battery management system 200.

[0054] Figure 4a and Figure 4b This is a diagram showing the control unit 120 of the battery management system 100 according to an embodiment.

[0055] refer to Figure 4aAccording to an embodiment, the control unit 120 can check (sensor) the voltage value of the voltage generated by the light receiving unit 110 based on the intensity of light received from the external battery management system 200. According to an embodiment, the control unit 120 of the battery management system 100 may include a first operational amplifier 410 that checks the voltage value of the voltage generated based on the intensity of light received from the external battery management system 200, and then compares the checked voltage value 412 with a specified target voltage value 411 to output a duty cycle voltage signal. The control unit 120 may also include: a pulse width modulation (PWM) logic circuit 420 that determines the duty cycle of the duty cycle voltage signal; a gate driver circuit 430 connected to the PWM logic circuit 420 and controlling the duty cycle; and a buck-boost converter circuit 440 connected to the gate driver circuit 430 and outputting a feedback voltage signal 446 based on a drive voltage 445 and the duty cycle.

[0056] According to an embodiment, a first operational amplifier 410 included in the control unit 120 of the battery management system 100 can output a duty cycle voltage signal to be input to the PWM logic circuit 420 by using a voltage value 412 checked by the control unit 120 and a specified target voltage value 411 as inputs. For example, the first operational amplifier 410 can increase in power and output a duty cycle voltage signal as the difference between the checked voltage value 412 and the specified target voltage value 411 increases.

[0057] According to an embodiment, the PWM logic circuit 420 included in the control unit 120 of the battery management system 100 can modulate the pulse width of the duty voltage signal received from the first operational amplifier 410 to determine the duty cycle of the duty voltage signal, and can send the determined duty cycle to the gate driver circuit 430.

[0058] According to an embodiment, the gate driver circuit 430 included in the control unit 120 of the battery management system 100 can control the duty cycle determined by the PWM logic circuit 420. For example, when the duty voltage signal increases, the gate driver circuit 430 can increase the duty cycle based on the duty voltage signal.

[0059] According to an embodiment, a buck-boost converter circuit 440 included in the control unit 120 of the battery management system 100 can receive the duty cycle from the gate driver circuit 430 and can output a feedback voltage signal 446 based on the drive voltage 445 and the duty cycle. For example, when the duty cycle of the signal received from the gate driver circuit 430 increases, the buck-boost converter circuit 440 can increase and output the feedback voltage signal 446. Through this operation, a buck-boost converter circuit 440 according to one embodiment of various embodiments of the present disclosure can output a variable feedback voltage signal 446.

[0060] In this embodiment, when the intensity of the light containing communication information received from the external battery management system 200 decreases, the voltage generated by the light receiving unit 110 of the battery management system 100 can also decrease, while the duty cycle voltage signal generated by the first operational amplifier 410 can increase. Therefore, when the duty cycle determined by the PWM logic circuit 420 connected to the first operational amplifier 410 increases, the buck-boost converter circuit 440 receives the increased duty cycle from the gate driver circuit 430 connected to the PWM logic circuit 420. As the duty cycle increases, the feedback voltage signal 446, which is the output value of the buck-boost converter circuit 440 driven by the drive voltage 445, can increase.

[0061] refer to Figure 4b According to an embodiment, the control unit 120 of the battery management system 100 may include a negative feedback circuit 450, which includes a second operational amplifier 451 and a MOSFET element 452, to provide a previously generated feedback voltage signal 446 to the light emitting unit 130. For example, the negative feedback circuit 450 may provide the feedback voltage signal 446 to the light emitting unit 130 based on the current 470 flowing through the MOSFET element 452. Although not shown, it is assumed that the power supply VDD is connected to the other end of the light emitting unit 130 connected to the MOSFET element 452.

[0062] For example, as mentioned above Figure 4aAs described, when the feedback voltage signal 446, which is the output value of the buck-boost converter circuit 440, increases, the current 470 flowing from the power supply VDD to the MOSFET element 452 and the light emitting unit resistor 460 can increase accordingly. In this way, the negative feedback circuit 450 included in the control unit 120 of the battery management system 100 can increase the intensity of light transmitted from the light emitting unit 130 to the external battery management system 200 by the current 470, which reflects the increased feedback voltage signal 446. At this time, according to the embodiment, the MOSFET element 452 can be a PMOS element, and the second operational amplifier 451 can apply the feedback voltage signal 446 to the drain terminal of the PMOS element, but the embodiment of the negative feedback circuit 450 according to this disclosure is not limited to this specific case.

[0063] Figure 5 This is a flowchart illustrating the operation of a battery management system 100 that performs optical feedback wireless communication according to an embodiment.

[0064] refer to Figure 5 In step 510, according to an embodiment, the battery management system 100 may first respond to light transmitted from the battery management system 100 to the external battery management system 200, generating a voltage based on the light containing communication information transmitted by the external battery management system 200. For example, the battery management system 100 may... Figure 3a and Figure 3b The light receiving unit 110 described herein receives light containing communication information from an external battery management system 200 and can generate a voltage based on the received light containing the communication information.

[0065] In step 520, according to an embodiment, the control unit 120 of the battery management system 100 can check the voltage value generated by the light receiving unit 110, which corresponds to the voltage value of the external battery management system 200, and based on the intensity of the light received from the external battery management system 200. For example, the battery management system 100 can compare a previously generated voltage value with a specified target voltage value, such as... Figure 3a and Figure 3b When the difference between these two voltage values ​​is greater than a predetermined specific value (e.g., when the generated voltage value is less than or greater than the predetermined specific value by a certain limit), the battery management system 100 can determine that the intensity of the light containing communication information received by the light receiving unit 110 from the external battery management system 200 has weakened, and correspondingly, can confirm that the voltage value of the external battery management system 200 has decreased.

[0066] In step 530, according to an embodiment, the control unit 120 of the battery management system 100 can adjust the intensity of light emitted from the light emitting unit 130 of the battery management system 100 based on the checked voltage value. For example, the battery management system 100 can use a light emitting unit 130 included in the control unit 120, such as... Figure 4a and Figure 4b The first operational amplifier 410, PWM logic circuit 420, gate driver circuit 430, buck-boost converter circuit 440, and negative feedback circuit 450 are used to adjust the intensity of light transmitted from the light emitting unit 130 of the battery management system 100 to the external battery management system 200. For example, when the checked voltage value has decreased, the control unit 120 of the battery management system 100 can control the intensity of light transmitted from the light emitting unit 130 to the external battery management system 200 to increase. According to an embodiment, the control unit 120 can pre-create a lookup table in which the intensity of light transmitted to the external battery management system 200 corresponds to the degree of decrease in the checked voltage value, and then store the lookup table in memory. The lookup table can then be used to generate a voltage signal capable of generating the desired light intensity.

[0067] In step 540, the battery management system 100 may transmit light containing communication information to the external battery management system 200. For example, the battery management system 100 may transmit light whose intensity has been controlled by the control unit 120 to the external battery management system 200.

[0068] In this way, even when the optical transmission capability decreases due to aging, dust, or condensation of the optical receiving unit 110 and optical transmitting unit 130 of the battery management system 100 and the optical receiving unit 210 and optical transmitting unit 230 of the external battery management system 200, the communication quality can be maintained at a constant level through the optical feedback process.

[0069] Figure 6 This is a block diagram illustrating the hardware configuration of a control unit 120 included in a battery management system 100 according to the present disclosure.

[0070] The control unit 120 according to embodiments disclosed in this document may include a microcontroller unit (MCU) 122, a memory 124, a communication interface (I / F) 126, and an input / output interface (I / F) 128. The MCU 122 acts as a processor that executes various programs stored in the memory 124, processes various data used in these programs, and performs the functions of the control unit 120.

[0071] Memory 124 can store operational data of various programs related to the operation of the battery management system used for the operation of control unit 120. Multiple memories 124 may be provided as needed. Memory 124 may be volatile or non-volatile memory. Examples of volatile memory 124 may include RAM, DRAM, SRAM, etc. Examples of non-volatile memory 124 may include ROM, PROM, EAROM, EPROM, EEPROM, flash memory, etc. The examples of memory 124 listed are merely illustrative, and memory 124 is not limited to these.

[0072] Communication I / F 126 is configured to send and receive various data to and from a server, and can be any of various devices that support wired and / or wireless communication. For example, Communication I / F 126 can send programs or various data for the operation of Control Unit 120 to and receive programs or various data for the operation of Control Unit 120 from a separately provided external server, both via wired and / or wireless means. Input / Output I / F 128 can provide an interface for interconnecting input devices (not shown), such as a keyboard, mouse, or touch panel, output devices (not shown), such as a display, and MCU 122 to enable data transmission and reception therebetween.

[0073] This embodiment can be represented by functional block configurations and various processing steps. These functional blocks can be implemented as any number of hardware and / or software configurations performing specific functions. For example, the embodiment can employ direct circuit configurations, such as memory, processing units, logic circuits, lookup tables, etc., which can perform various functions under the control of one or more microprocessors or by other control devices. Similar to how components can be implemented using software programming or software elements, this embodiment can be implemented in programming or scripting languages ​​such as C, C++, Java, or assembler, including various algorithms implemented as combinations of data structures, procedures, routines, or other programming constructs. Functional aspects can be implemented as algorithms running on one or more processors. Furthermore, this embodiment can employ conventional techniques for electronic environment setup, signal processing, and / or data processing. Terms such as “mechanism,” “component,” “device,” and “configuration” can be used broadly and are not limited to mechanical and physical configurations. The above terms can also include the meaning of a series of software processes (routines) in conjunction with a processor.

[0074] Although the present disclosure has been described above with reference to several embodiments, the present disclosure is not limited to the embodiments, and various changes and modifications can be made by those skilled in the art without departing from the technical spirit and equivalent scope of the present disclosure as defined by the appended claims.

Claims

1. A battery management system, comprising: A light receiving unit is configured to receive light containing communication information from an external battery management system and generate a voltage corresponding to the intensity of the received light. A light emitting unit configured to transmit light containing communication information to the external battery management system; as well as Control unit The control unit is configured to: Check the voltage value of the voltage generated by the light receiving unit based on the intensity of the light received from the external battery management system; as well as The intensity of the light emitted from the light emitting unit is adjusted based on the checked voltage value.

2. The battery management system according to claim 1, wherein, When the intensity of light received from the external battery management system decreases, the control unit controls the intensity of light transmitted from the light emitting unit to the external battery management system to increase.

3. The battery management system according to claim 1, wherein, The control unit adjusts the intensity of the light transmitted from the light emitting unit to the external battery management system so that the checked voltage value is equal to the specified target voltage value.

4. The battery management system according to claim 3, wherein, The specified target voltage value is determined based on the power consumption of communication between the battery management system and the external battery management system.

5. The battery management system according to claim 1, wherein, The control unit includes: A first operational amplifier is configured to compare the voltage value being checked with a specified target voltage value and output a duty cycle voltage signal. A pulse width modulation logic circuit, configured to determine the duty cycle of the duty voltage signal; A gate driver circuit, which is connected to the pulse width modulation logic circuit and configured to control the duty cycle; A buck-boost converter circuit, connected to the gate driver circuit and configured to output a feedback voltage signal based on the drive voltage and the duty cycle; and A negative feedback circuit, comprising a second operational amplifier and a MOSFET element, is provided to the optical emitting unit with the feedback voltage signal.

6. The battery management system according to claim 5, wherein, As the difference between the checked voltage value and the specified target voltage value increases, the first operational amplifier increases and outputs the duty cycle voltage signal.

7. The battery management system according to claim 5, wherein, If the duty cycle increases, the buck-boost converter circuit increases and outputs the feedback voltage signal.

8. The battery management system according to claim 5, wherein, The negative feedback circuit provides the feedback voltage signal to the light emitting unit based on the current flowing through the MOSFET element.

9. The battery management system according to claim 5, wherein, The MOSFET element is a PMOS element, and the second operational amplifier applies the feedback voltage signal to the drain terminal of the PMOS element.

10. An optical feedback communication method for a battery management system, the method comprising: A voltage corresponding to the intensity of the light received from an external battery management system is generated based on light containing communication information. Check the value of the generated voltage; The intensity of the light emitted from the light-emitting unit is adjusted based on the checked voltage value; as well as The light containing communication information is sent to the external battery management system.

11. A battery management system, comprising: A light receiving unit is configured to receive light containing communication information from an external battery management system and generate a voltage corresponding to the intensity of the received light. A light emitting unit configured to transmit light containing communication information to the external battery management system; as well as Control unit The control unit includes an optical feedback circuit configured to check the voltage value of the voltage generated by the light receiving unit based on the intensity of the light received from the external battery management system, and to adjust the intensity of the light emitted from the light emitting unit based on the checked voltage value. The optical feedback circuit includes a converter circuit configured to generate a variable voltage signal for transmitting an optical signal from the optical emitting unit to the external battery management system based on the checked voltage value.

12. The battery management system according to claim 11, wherein, The optical feedback circuit also includes: A first operational amplifier is configured to compare the voltage value being checked with a specified target voltage value and output a duty cycle voltage signal. A pulse width modulation logic circuit, configured to determine the duty cycle of the duty voltage signal; A gate driver circuit, connected to the pulse width modulation logic circuit and configured to control the duty cycle; and A second operational amplifier and MOSFET elements are used to provide a feedback voltage signal to the light emitting unit.

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