Optical feedback communication method and battery management system for performing the same.

Abstract

A battery management system is disclosed, which includes a light receiving unit that generates a voltage based on light containing communication information received from an external battery management system, and a light emitting unit and a control unit that transmit light containing communication information to the external battery management system, wherein the control unit is configured to check the voltage value generated by the light receiving unit in accordance with the intensity of the light received from the external battery management system 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.

Description

Technical Field

[0001] The present disclosure relates to an optical feedback communication method and a battery management system that implements the same.

Background Art

[0002] In order to efficiently and smoothly control a battery, a battery management system (Battery Management System, BMM) is used. For example, the battery management system measures the current, voltage, or temperature of a battery mounted on a battery electric vehicle (BEV) or an energy storage system (ESS) through a sensor, and appropriately utilizes the measured values to manage the battery's life, performance, and safety, so as to control the battery to exhibit optimal performance.

[0003] Therefore, in the battery, it is necessary for a plurality of battery management systems to exchange data and various information with each other via wired or wireless communication.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The technical problems to be achieved by the present embodiment are not limited to the above technical problems, and other technical problems can be analogized from the following embodiments.

Means for Solving the Problems

[0005] A battery management system according to an embodiment includes a light receiving unit that generates a voltage based on light having communication information received from an external battery management system, a light emitting unit that transmits light having communication information to the external battery management system, and a control unit. The control unit is configured to confirm a voltage value of the voltage generated by the light receiving unit according to the intensity of the light received from the external battery management system, and adjust the intensity of the light transmitted from the light emitting unit based on the confirmed voltage value.

[0006] The control unit can control the intensity of light transmitted from the light-emitting unit to the external battery management system to increase when the intensity of light received from the external battery management system decreases.

[0007] The control unit can adjust the intensity of the light transmitted from the light-emitting unit to the external battery management system so that the confirmed voltage value and the specified target voltage value become the same.

[0008] The specified target voltage value may be determined based on the communication power consumption between the battery management system and the external battery management system.

[0009] The control unit may include a first operational amplifier that compares the confirmed voltage value with a specified target voltage value and outputs a duty cycle voltage signal; a PWM (pulse width modulation) logic circuit that determines the duty cycle for the duty cycle voltage signal; a gate driver circuit connected to the PWM logic circuit and controlling the duty cycle; a buck boost converter circuit connected to the gate driver circuit and outputting a feedback voltage signal based on the drive voltage and the duty cycle; and a negative feedback circuit including a second operational amplifier and a MOSFET element for providing the feedback voltage signal to the light-emitting unit.

[0010] The first operational amplifier can increase the duty cycle voltage signal and output it as the difference between the confirmed voltage value and the specified target voltage value increases.

[0011] The buck boost converter circuit can increase and output the feedback voltage signal when the duty cycle increases.

[0012] The negative feedback circuit can supply the feedback voltage signal to the light-emitting unit based on the current flowing through the MOSFET element.

[0013] The MOSFET element is a PMOS element, and the second operational amplifier can apply the feedback voltage signal to the drain terminal of the PMOS element.

[0014] An optical feedback communication method for a battery management system according to one embodiment may include the steps of: generating a voltage based on light having communication information received from an external battery management system; confirming 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; adjusting the intensity of the light transmitted from the light emitting unit based on the confirmed voltage value; and transmitting light having communication information to the external battery management system.

[0015] Specific details of other embodiments are included in the detailed description and drawings. [Effects of the Invention]

[0016] In the case of the optical feedback communication method according to this disclosure, even if a deterioration in the communication performance between the battery management system and the external battery management system over time is detected, the optical feedback communication method to which a negative feedback scheme is applied can maintain a constant intensity of light used for communication between the battery management system and the external battery management system, thereby maintaining a smooth communication state.

[0017] The effects of the various embodiments of this disclosure are not limited to those mentioned above, and any further effects not mentioned should be clearly understood by a person of the art ordinary from the description of the claims. [Brief explanation of the drawing]

[0018] The following drawings attached to this specification illustrate embodiments of various embodiments of the present disclosure, and together with the detailed description of the invention described below, serve to further understand the technical idea of various embodiments of the present disclosure. Therefore, various embodiments of the present disclosure should not be construed as being limited only to the matters described in such drawings.

[0019] [Figure 1] It is a diagram for explaining the concept of a system that implements an optical feedback communication method between battery management systems according to an embodiment.

[0020] [Figure 2] It is a block diagram for explaining the structure of a battery management system that performs optical feedback wireless communication according to an embodiment.

[0021] [Figure 3a] It is a diagram for generally explaining the optical feedback process between a battery management system and an external battery management system according to an embodiment. [Figure 3b] It is a diagram for generally explaining the optical feedback process between a battery management system and an external battery management system according to an embodiment.

[0022] [Figure 4a] It is a diagram for explaining the control unit of a battery management system according to an embodiment. [Figure 4b] It is a diagram for explaining the control unit of a battery management system according to an embodiment.

[0023] [Figure 5] It is a flowchart for explaining the operation of a battery management system that performs optical feedback wireless communication according to an embodiment.

[0024] [Figure 6] It is a block diagram showing the hardware configuration of the control unit included in a battery management system according to an embodiment.

[0025] In some of the attached figures, corresponding components are given the same reference numerals. Those skilled in the art will understand that the figures illustrate elements simply and clearly, and are not necessarily drawn to scale. For example, to aid in understanding the various embodiments, the dimensions of some elements shown in the figures may be exaggerated compared to others. Also, elements of known technology that are useful or essential in commercially viable embodiments may often be omitted so as not to detract from the spirit of the various embodiments of this disclosure. [Modes for carrying out the invention]

[0026] The terminology used in the embodiments has been selected to the greatest extent possible from currently widely used and general terms, taking into account the functions described herein, although this may change depending on the intent of the articulators, case law, the emergence of new technologies, etc. In certain cases, the applicant has also arbitrarily selected some terms, in which case their meaning will be described in detail in the relevant section of the description. Therefore, the terminology used in this disclosure should not be defined simply as a term name, but rather based on the meaning of the term and the overall content of this disclosure.

[0027] When, throughout the specification, a part of a specification is said to "include" a certain component, this means, unless otherwise stated, that it may include other components rather than excluding them.

[0028] Throughout the specification, the expression “at least one of a, b, and c” may encompass “a alone,” “b alone,” “c alone,” “a and b,” “a and c,” “b and c,” or “all of a, b, and c.”

[0029] The term "terminal" as used below can refer to a computer or portable terminal that can connect to a server or other terminals via a network. Here, a computer includes, for example, a laptop, desktop, or laptop computer equipped with a web browser, and a portable terminal is, for example, a wireless communication device that guarantees portability and mobility, and can include all kinds of handheld wireless communication devices such as IMT (International Mobile Telecommunication), CDMA (Code Division Multiple Access), W-CDMA (W-Code Division Multiple Access), LTE (Long Term Evolution), smartphones, and tablet PCs.

[0030] The embodiments of this disclosure will be described below in detail, with reference to the attached drawings, so that they can be easily implemented by a person with ordinary skill in the art to which this disclosure pertains. However, this disclosure can be implemented in a variety of different forms and is not limited to the embodiments described herein.

[0031] A Battery Management System (BMS) can be installed, for example, at the battery pack, battery module, and battery cell level. These BMS systems manage the battery pack, battery module, and battery cell to ensure stable operation through communication between them.

[0032] Wireless communication between battery management systems offers advantages not only in terms of communication quality but also in terms of system simplification. In such wireless communication between battery management systems, for example, an optical communication system using light-emitting diodes (LEDs) as light-emitting elements and photodetectors (LEDs) as photodetectors can be used. While optical communication systems using light-emitting and photodetectors have many advantages, communication quality can deteriorate due to aging of these elements or a decrease in light transmission capacity due to dust and condensation. For example, if the performance of photodiodes degrades, leading to a decrease in communication performance, it becomes difficult for the battery management system to detect this decrease and maintain communication performance.

[0033] Various embodiments of this disclosure provide a battery management system and a communication method that use optical feedback to maintain constant communication quality even when the light transmission capacity decreases due to element aging, dust, or condensation.

[0034] Embodiments of this disclosure will be described in detail below with reference to the drawings.

[0035] Figure 1 is a diagram illustrating the concept of a system that performs an optical feedback communication method between battery management systems according to one embodiment.

[0036] Referring to Figure 1, a system 101 that performs an optical feedback communication method according to one embodiment may include a battery management system 100 that performs optical feedback communication control and an external battery management system 200 that communicates with the battery management system 100.

[0037] The external battery management system 200 as used herein means a battery management system that is in a communication relationship with the battery management system 100, which performs optical feedback communication control in various embodiments of this disclosure, regardless of its physical location. For example, assuming communication between the BMS of a battery pack and the BMS of a specific battery module contained in the pack, the BMS of the battery pack can be assumed to be the battery management system 100, and the BMS of the specific battery module can be assumed to be the external battery management system 200.

[0038] Various embodiments of this disclosure are for maintaining the 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 in various embodiments of this disclosure proposes a method to maintain communication performance by increasing the light intensity at the light-emitting unit 130 after receiving the light transmitted through the light-emitting unit 230 of the external battery management system 200 at the light-receiving unit 110 of the battery management system 100, even if the light intensity decreases due to the cumulative use of the light-emitting unit 130 of the battery management system 100, and the light intensity received by the light-receiving unit 210 of the external battery management system 200 decreases. Thus, various embodiments of this disclosure can maintain communication performance between the battery management system 100 and the external battery management system 200 through a negative feedback method, even if dust accumulates in the respective light-emitting units 130 and 230 and light-receiving units 110 and 210 as the communication period between the battery management systems lengthens using an optical feedback control method.

[0039] In the examples described above, we assumed a case where the light intensity decreases in accordance with the cumulative use of the light-emitting unit 130 of the battery management system 100. However, the various embodiments of this disclosure are not limited to this and can similarly be applied, for example, to a case where the light intensity decreases in accordance with the cumulative use of the light-emitting unit 230 of an external battery management system 200.

[0040] Figure 2 is a block diagram illustrating the structure of a battery management system that performs optical feedback wireless communication according to one embodiment.

[0041] Referring to Figure 2, a battery management system 100 according to one embodiment may include a light receiving unit 110 that generates a corresponding voltage based on light containing communication information received from an external battery management system 200, a light emitting unit 130 that transmits light containing communication information to the external battery management system 200, and a control unit 120. Only the components according to this embodiment are shown in the battery management system 100 illustrated in Figure 2. Therefore, a person with ordinary skill in the art according to this embodiment will understand that other general-purpose components may be included in addition to the components shown in Figure 2.

[0042] In one embodiment, the light-receiving unit 110 of the battery management system 100 can receive an optical signal (light) transmitted from the light-emitting unit 230 of an external battery management system 200 and generate a voltage based on the received light. In one embodiment, the light-receiving unit 110 of the battery management system 100 may include one or more photodiodes, which are semiconductor diodes with functions such as photodetectors. The photodiodes included in the light-receiving unit 110 have a PN junction or PIN structure, and when light with sufficient photon energy is incident on the photodiode, moving electrons and positive charge holes are created, and the electrons become active, thereby generating a photocurrent. When the current thus generated flows through a resistor, it can generate a voltage corresponding to the intensity of the light. On the other hand, in this disclosure, the terms optical signal and light are used interchangeably and have the same meaning.

[0043] In one 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 accordance with the light signal transmitted from the external battery management system 200, based on the intensity of light received from the external battery management system 200, and to adjust the intensity of the light transmitted from the light emitting unit 130 to the external battery management system 200 based on the checked voltage value. For example, the control unit 120 of the battery management system 100 may control the intensity of the light transmitted from the light emitting unit 130 to the external battery management system 200 to increase when the intensity of light received from the external battery management system 200 decreases. 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 adjust the intensity of the light transmitted from the light emitting unit 130 to the external battery management system 200 so that the voltage value corresponding to the intensity of light received from the external battery management system 200 is the same as a specified target voltage value. In this case, the specified target voltage value may be determined, in one embodiment, based on the communication power consumption between the battery management system 100 and the external battery management system 200, or based on the minimum power consumption required to maintain wireless communication between the battery management system 100 and the external battery management system 200.

[0044] 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, like the light-receiving unit 110 described above, may include one or more photodiodes that are semiconductor diodes with functions such as photodetectors, and can transmit light with a suitable light intensity to the external battery management system 200 in order to perform optical feedback in response to control from the control unit 120 of the battery management system 100.

[0045] Figures 3a and 3b are diagrams illustrating the optical feedback process of a battery management system 100 and an external battery management system 200 according to one embodiment.

[0046] Referring to Figure 3a, when the battery management system 100 and the external battery management system 200 according to one embodiment send and receive signals to each other, the overall optical feedback process within the battery management system 100 can be confirmed.

[0047] First, the control unit 120 of the battery management system 100 generates a required target voltage value 411 based on the communication power consumption used for communication with the external battery management system 200, compares the target voltage value 411 with a voltage value 412 confirmed based on the light received through the light receiving unit 110 of the battery management system 100, and transmits this to the negative feedback circuit 450 within the control unit 120. The negative feedback circuit 450 can appropriately change the intensity of the light transmitted from the light-emitting unit 130 of the battery management system 100 to the external battery management system 200 through a current 470 that reflects the feedback voltage signal generated in the control unit 120 according to the comparison result between the target voltage value 411 set based on the communication power consumption and the voltage value 412 confirmed based on the light received through the light receiving unit 110. As a result of this negative feedback action, the voltage value 411 of the voltage generated by the light receiving unit 110 of the battery management system 100 based on the light received from the external battery management system 200 can be controlled to be the same as the target voltage value 412.

[0048] Through the negative feedback described above, the battery management system 100 can maintain the same voltage value 411 and target voltage value 412 even when it senses that the strength of the wireless communication signal between the battery management system 100 and the external battery management system 200 has weakened and the voltage value 412 confirmed through the light-receiving unit 110 of the battery management system 100 has decreased. The operations performed by each component in the optical feedback process mentioned above will be described individually below.

[0049] Figure 3b is a diagram illustrating, in one embodiment, the overall process within the external battery management system 200 in which the battery management system 100 receives light from the external battery management system 200.

[0050] Referring to Figure 3b, the 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. If dust accumulates in the photodiode in the light-emitting unit 130 of the battery management system 100, or in the photodiode 310 included in the light-receiving unit 210 of the external battery management system 200, and the intensity of the light received from the light-receiving unit 210 of the external battery management system 200 decreases, the current 315 flowing through the photodiode 310 of the light-receiving unit 210, which is driven by the drive voltage (VDD) 330, may decrease. If the degree of voltage drop across the resistor 320 of the light-receiving unit decreases in accordance with the decrease in the current 315 flowing through the photodiode 310 of the light-receiving unit 210 of the external battery management system 200, then the voltage 325 of the light-receiving unit may decrease. A decrease in the voltage 325 of the light-receiving unit 200 may be transmitted to the light-emitting unit 230 connected to the light-receiving unit 210 of the external battery management system 200. This may reduce 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, and the voltage generated by the light-receiving unit 110 of the battery management system 100 may also decrease. As a result, the control unit 120 of the battery management system 100 may 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 control it to ensure that light of appropriate intensity is transmitted to the external battery management system 200 through the light-emitting unit 130 of the battery management system 100 by appropriate correction.

[0051] Figures 4a and 4b are diagrams illustrating the control unit 120 of a battery management system 100 according to one embodiment.

[0052] Referring to Figure 4a, in one embodiment, the control unit 120 can confirm (detect) 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. In one embodiment, the control unit 120 of the battery management system 100 may include a first operational amplifier 410 that, after confirming the voltage value of the voltage generated in accordance with the intensity of light received from the external battery management system 200, compares the confirmed voltage value 412 with a specified target voltage value 411 and outputs a duty voltage signal; a PWM (pulse width modulation) logic circuit 420 that determines the duty ratio for the duty voltage signal; a gate driver circuit 430 connected to the PWM logic circuit 420 and controlling the duty ratio; and a buck boost converter circuit 440 connected to the gate driver circuit 430 and outputs a feedback voltage signal 446 based on the drive voltage 445 and the duty ratio.

[0053] A first operational amplifier 410 included in the control unit 120 of a battery management system 100 according to one embodiment can output a duty cycle voltage signal input to a PWM logic circuit 420, taking the voltage value 412 confirmed by the control unit 120 and the specified target voltage value 411 as inputs. For example, the first operational amplifier 410 can increase the duty cycle voltage signal output as the magnitude of the difference between the confirmed voltage value 412 and the specified target voltage value 411 increases.

[0054] A PWM logic circuit 420 included in the control unit 120 of a battery management system 100 according to one embodiment can modulate the pulse width of the duty cycle voltage signal received from the first operational amplifier 410 to determine the duty cycle of the duty cycle voltage signal, and transmit the determined duty cycle to the gate driver circuit 430.

[0055] A gate driver circuit 430 included in the control unit 120 of a battery management system 100 according to one embodiment can control the duty cycle determined through a PWM logic circuit 420. For example, the gate driver circuit 430 can increase the duty cycle based on the duty voltage signal when the duty voltage signal increases.

[0056] A buck boost converter circuit 440 included in the control unit 120 of a battery management system 100 according to one embodiment can receive the duty cycle from the gate driver circuit 430 and output a feedback voltage signal 446 based on the drive voltage 445 and the duty cycle. For example, if 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 such operation, a buck boost converter circuit 44 according to one embodiment of various embodiments of the present disclosure can output a variable feedback voltage signal 446.

[0057] In one embodiment, when the intensity of 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 decreases, and the duty cycle voltage signal generated by the first operational amplifier 410 may increase. As a result, when the duty cycle determined through the PWM logic circuit 420 connected to the first operational amplifier 410 increases, the buck boost converter circuit 440 receives the increased duty cycle through the gate driver circuit 430 connected to the PWM logic circuit 420, and the feedback voltage signal 446, which is the output value of the buck boost converter circuit 440 driven by the drive voltage 445, may increase in accordance with the increase in the duty cycle.

[0058] Referring to Figure 4b, the control unit 120 of the battery management system 100 according to one embodiment may include a negative feedback circuit 450 that includes a second operational amplifier 451 and a MOSFET element 452 for providing the previously generated feedback voltage signal 446 to the light-emitting unit 130. For example, the negative feedback circuit 450 can provide the feedback voltage signal 446 to the light-emitting unit 130 based on the current 470 flowing through the MOSFET element 452. On the other hand, although not shown, it is assumed that a power source (VDD) is connected to the other end of the light-emitting unit 130 connected to the MOSFET element 452.

[0059] For example, as explained earlier in Figure 4a, if 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 source (VDD) to the MOSFET element 452 and the resistor 460 of the light-emitting unit may increase in accordance with the increase in the feedback voltage signal 446. 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 the light transmitted from the light-emitting unit 130 to the external battery management system 200 through the current 470 which reflects the increased feedback voltage signal 446. In this case, the MOSFET element 452 may be a PMOS element in one embodiment, and the second operational amplifier 451 can apply the feedback voltage signal 446 to the drain terminal of the PMOS element, but is not limited to the specific cases mentioned in the embodiments of the negative feedback circuit 450 according to this disclosure.

[0060] Figure 5 is a flowchart illustrating the operation of a battery management system that performs optical feedback wireless communication according to one embodiment.

[0061] Referring to Figure 5, in step 510, the battery management system 100 according to one embodiment can first generate a voltage based on light containing communication information transmitted by the external battery management system 100 as a response to light transmitted from the battery management system 100 to the external battery management system 200. For example, the battery management system 100 can receive light containing communication information from the external battery management system 200 through the light receiving unit 110 described in Figures 3a and 3b, and generate a voltage based on the received light containing communication information.

[0062] In step 520, the control unit 120 of the battery management system 100 according to one embodiment can confirm the voltage value generated by the light receiving unit 110 in accordance with the voltage value of the external battery management system 200 based on the intensity of light received from the external battery management system 200. For example, as explained in Figures 3a and 3b, the battery management system 100 compares the previously generated voltage value with a specified target voltage value, and if the difference between the two values ​​is greater than a predetermined specific value (for example, if the generated voltage value is less than or equal to a certain limit below the predetermined specific value), it can determine that the intensity of the light containing the communication information received from the external battery management system 200 through the light receiving unit 110 has weakened, and can confirm that the voltage value of the external battery management system 200 has decreased accordingly.

[0063] In step 530, the control unit 120 of the battery management system 100 according to one embodiment can adjust the intensity of light transmitted from the light-emitting unit 130 of the battery management system 100 based on the confirmed voltage value. For example, the battery management system 100 can 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 through the first operational amplifier 410, PWM logic circuit 420, gate driver circuit 430, buck boost converter circuit 440, and negative feedback circuit 450 included in the control unit 120 as described in Figures 4a and 4b. For example, if the confirmed voltage value decreases, the battery management system 100 can adjust the intensity of light transmitted from the light-emitting unit 130 to the external battery management system 200 through the control unit 120 to increase. In one embodiment, the control unit 120 can pre-generate a lookup table corresponding to the degree to which the confirmed voltage value has decreased, store it in a memory element, and then use this to generate a voltage signal capable of generating the required light intensity.

[0064] 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 with controlled intensity to the external battery management system 200 via the control unit 120.

[0065] In this way, through the optical feedback process, even if the light transmission capacity of the light receiving unit 110 and light emitting unit 130 of the battery management system 100, and the light receiving unit 210 and light emitting unit 230 of the external battery management system 200 deteriorates, dust accumulates, or condensation occurs, a constant level of communication quality can be maintained.

[0066] Figure 6 is a block diagram showing the hardware configuration for realizing the control unit included in the battery management system 100 according to the present invention.

[0067] A control unit 120 according to one embodiment disclosed herein may include an MCU 122, a memory 124, a communication interface 126, and an input / output interface 128. The MCU 122 is a Micro Controller Unit, which is a processor that executes various programs stored in the memory 124 and performs the functions of the control unit 120 while processing various data used in such programs.

[0068] Memory 124 can store operation data for various programs related to the operation of the battery management system for the operation of the control unit 120. Multiple such memories 124 may be provided as needed. Memory 124 may be volatile memory or non-volatile memory. As volatile memory, RAM, DRAM, SRAM, etc. may be used for memory 124. As non-volatile memory, ROM, PROM, EAROM, EPROM, EEPROM, flash memory, etc. may be used for memory 124. The examples of memory 124 listed above are merely illustrative and are not limiting.

[0069] The communication interface (126) is configured to send and receive various data with a server and can be various devices that support wired or wireless communication. For example, through the communication interface 126, a separately provided external server can send and receive programs and various data for the operation of the control unit 120 via wired or wireless connection. The input / output interface 128 can provide an interface that connects input devices (not shown), such as a keyboard, mouse, or touch panel, and output devices (not shown), such as a display, with the MCU 122, enabling data transmission and reception.

[0070] This embodiment may be represented by a functional block configuration and various processing stages. Such a functional block may be implemented by various numbers of hardware and / or software configurations that perform a specific function. For example, the embodiment may employ direct circuit configurations such as memory, processing, logic, look-up tables, etc., which can perform various functions under the control of one or more microprocessors or other control devices. Just as the components may be implemented by software programming or software elements, this embodiment may also include various algorithms implemented by combinations of data structures, processes, routines, or other programming configurations, such as C, C ++ This can be implemented using programming or scripting languages ​​such as Java®, assembler, etc. Functional aspects can be implemented using algorithms executed on one or more processors. Furthermore, this embodiment can employ prior art for electronic environment configuration, signal processing, and / or data processing, etc. Terms such as “mechanism,” “element,” “means,” and “configuration” can be used broadly and are not limited to mechanical and physical configurations. The terms may also include the meaning of a series of software processes (routines) in conjunction with a processor, etc.

[0071] While the embodiments of this disclosure have been described above with reference, it will be understood that a person skilled in the art or an ordinary person with ordinary knowledge in the art can modify and change these various embodiments in various ways, without departing from the technical scope of the various embodiments of this disclosure as described in the claims below. Therefore, the technical scope of the various embodiments of this disclosure should not be limited to what is described in the detailed description of the specification, but should be defined by the claims.

Claims

1. In a battery management system, A light receiving unit that receives light containing communication information from an external battery management system and generates a voltage corresponding to the intensity of the received light, A light-emitting unit that transmits light containing communication information to the external battery management system, Includes a control unit, The control unit, Based on the light intensity received from the external battery management system, the voltage value of the voltage generated by the light receiving unit is confirmed. A battery management system configured to adjust the intensity of light transmitted from the light-emitting unit based on the voltage value confirmed above.

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

3. The control unit, The intensity of the light transmitted from the light-emitting unit to the external battery management system is adjusted so that the confirmed voltage value and the specified target voltage value are the same. The battery management system according to claim 1.

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

5. The control unit, A first operational amplifier that compares the confirmed voltage value with a specified target voltage value and outputs a duty cycle voltage signal, A PWM logic circuit that determines the duty cycle for the duty voltage signal, A gate driver circuit connected to the PWM logic circuit and controlling the duty cycle, A buck boost converter circuit is connected to the gate driver circuit and outputs a feedback voltage signal based on the drive voltage and the duty cycle, The following are included for providing the feedback voltage signal to the light-emitting section: Includes a negative feedback circuit, The battery management system according to claim 1.

6. The first operational amplifier is, The larger the difference between the voltage value confirmed above and the specified target voltage value, The duty cycle voltage signal is increased and output. The battery management system according to claim 5.

7. The aforementioned buck boost converter circuit is, When the duty cycle increases, The aforementioned feedback voltage signal is increased and output. The battery management system according to claim 5.

8. The aforementioned negative feedback circuit is The feedback voltage signal is provided to the light-emitting unit based on the current flowing through the MOSFET element. The battery management system according to any one of claims 5 to 7.

9. The MOSFET element is PMOS element, The second operational amplifier is, The feedback voltage signal is applied to the drain terminal of the PMOS element. The battery management system according to any one of claims 5 to 7.

10. In an optical feedback communication method for a battery management system, A step of generating a voltage corresponding to the intensity of the received light based on the light containing communication information received from an external battery management system, The step of confirming the generated voltage value, Based on the voltage value confirmed above, the step of adjusting the intensity of the light transmitted from the light-emitting unit, The step includes transmitting light containing communication information to the external battery management system, Optical feedback communication method.

11. In a battery management system, A light receiving unit that receives light containing communication information from an external battery management system and generates a voltage corresponding to the intensity of the received light, A light-emitting unit that transmits light containing communication information to the external battery management system, Includes a control unit, The control unit, The optical feedback circuit is configured to check the voltage value of the voltage generated by the light receiving unit in accordance with 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. A battery management system comprising an optical feedback circuit, which includes a converter circuit configured to generate a variable voltage signal for an optical signal transmitted from the light-emitting unit to the external battery management system based on the confirmed voltage value.

12. The optical feedback circuit is, A first operational amplifier that compares the confirmed voltage value with a specified target voltage value and outputs a duty cycle voltage signal, A PWM logic circuit that determines the duty cycle for the duty voltage signal, A gate driver circuit connected to the PWM logic circuit and controlling the duty cycle, The battery management system according to claim 11, further comprising a second operational amplifier and a MOSFET element for providing a feedback voltage signal to the light-emitting unit.

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