Optical feedback communication method and battery management system 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 emitting unit for transmitting the light having communication information to the external battery management system; and a control unit. The control unit determines a voltage value generated by the light receiving unit according to the intensity of the light received from the external battery management system, the voltage value being determined on the basis of the intensity of the light received from the external battery management system, and adjusts the intensity of the light transmitted from the light emitting unit, the intensity being adjusted on the basis of the determined voltage value.

Description

Optical feedback communication method and battery management system performing the same

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

[0002] Battery management systems (BMS) are used to efficiently and seamlessly control batteries. For example, BMSs measure the current, voltage, and temperature of batteries installed in electric vehicles (BEVs) or energy storage systems (ESSs) through sensors and appropriately utilize these data to manage battery life, performance, and safety, ensuring optimal battery performance.

[0003] To achieve this, multiple battery management systems need to exchange data and various information with each other through wired or wireless communication.

[0004] The technical tasks to be achieved by this embodiment are not limited to the technical tasks described above, and other technical tasks can be inferred from the following embodiments.

[0005] A battery management system according to one 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 the communication information to the external battery management system; and a control unit, wherein the control unit can be configured to check a voltage value of the voltage generated by the light receiving unit corresponding to the intensity of the light received from the external battery management system, and to adjust the intensity of the light transmitted by the light emitting unit based on the checked 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 above control unit can adjust the intensity of 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 above-specified target voltage value can 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 for comparing the confirmed voltage value with a designated target voltage value and outputting a duty voltage signal; a PWM (pulse width modulation) logic circuit for determining a duty ratio for the duty voltage signal; a gate driver circuit connected to the PWM logic circuit and controlling the duty ratio; a buck boost converter circuit connected to the gate driver circuit and outputting a feedback voltage signal based on a driving voltage and the duty ratio; 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 above first operational amplifier can output the duty voltage signal by increasing it as the difference between the confirmed voltage value and the specified target voltage value increases.

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

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

[0013] The above 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 of a battery management system according to one embodiment may include: generating a voltage based on light having communication information received from an external battery management system; confirming a voltage value of a voltage generated by the light receiving unit based on the intensity of light received from the external battery management system; adjusting the intensity of 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.

[0016] According to the optical feedback communication method according to the present disclosure, even if a deterioration in communication performance between the battery management system and the external battery management system over time is detected, the intensity of light used for communication between the battery management system and the external battery management system can be kept constant according to the optical feedback communication method to which a negative feedback method is applied, and the communication state can be maintained smoothly.

[0017] The effects according to various embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

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

[0019] FIG. 1 is a diagram illustrating a concept of a system that performs an optical feedback communication method between battery management systems according to one embodiment.

[0020] FIG. 2 is a block diagram illustrating the structure of a battery management system performing optical feedback wireless communication according to one embodiment.

[0021] FIGS. 3A and 3B are drawings for generally explaining the optical feedback process of a battery management system and an external battery management system according to one embodiment, respectively.

[0022] FIGS. 4A and 4B are drawings for explaining a control unit of a battery management system according to one embodiment.

[0023] FIG. 5 is a flowchart illustrating the operation of a battery management system performing optical feedback wireless communication according to one embodiment.

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

[0025] In some of the accompanying drawings, corresponding components are designated by the same reference numerals. Those skilled in the art will appreciate that the drawings illustrate elements simply and clearly and are not necessarily drawn to scale. For example, to facilitate understanding of various embodiments, the dimensions of some elements depicted in the drawings may be exaggerated relative to other elements. Furthermore, elements of known technology that are useful or essential in commercially feasible embodiments may often not be depicted so as not to obscure the spirit of the various embodiments of the present disclosure.

[0026] The terms used in the examples have been selected from widely used, current terms, taking into account the functions of the present disclosure. However, these terms may vary depending on the intentions of those skilled in the art, precedents, the emergence of new technologies, etc. Furthermore, in certain cases, terms may be arbitrarily selected by the applicant, in which case their meanings will be described in detail in the relevant description. Therefore, the terms used in this disclosure should not be defined simply as names, but rather based on the meanings of the terms and the overall content of the present disclosure.

[0027] When a part of a specification is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise stated.

[0028] The expression "at least one of a, b, and c" described 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'.

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

[0030] Below, embodiments of the present disclosure are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present disclosure. However, the present disclosure may be implemented in various 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 BMSs communicate with each other to ensure the stable operation of the battery pack, battery module, and battery cell.

[0032] Among communication methods between battery management systems, wireless communication offers advantages in terms of both communication quality and system simplification. For example, optical communication methods utilizing light-emitting diodes (LEDs) as light-emitting elements and photodetectors as light-receiving elements can be used for wireless communication between battery management systems. While optical communication methods utilizing light-emitting and photodetector elements offer many advantages, communication quality can deteriorate due to deterioration of these elements or deterioration of light transmission due to dust and condensation. For example, when communication performance deteriorates due to the use of photodiodes, it is difficult to detect this deterioration and maintain communication performance within the battery management system.

[0033] Various embodiments of the present disclosure provide a battery management system and communication method that can maintain constant communication quality even when light transmission is reduced due to aging, dust, or condensation of a device by using optical feedback.

[0034] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

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

[0036] Referring to FIG. 1, a system (101) performing an optical feedback communication method according to one embodiment may include a battery management system (100) performing optical feedback communication control and an external battery management system (200) performing communication with the battery management system (100).

[0037] The external battery management system (200) referred to herein refers to a battery management system that is in a communication relationship with the battery management system (100) that performs optical feedback communication control of various embodiments of the present disclosure, regardless of physical location. For example, it is assumed that the communication is between the BMS of a battery pack and the BMS of a specific battery module included in the pack, and the BMS of the battery pack may be assumed to be the battery management system (100) and the BMS of the specific battery module may be assumed to be the external battery management system (200).

[0038] Various embodiments of the present disclosure are intended to maintain the communication performance of a battery management system (100) and an external battery management system (200) through optical feedback. For example, the battery management system (100) of various embodiments of the present disclosure proposes a method for maintaining the communication performance by increasing the intensity of light at the light emitting unit (130) after receiving 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 intensity of light decreases due to accumulated use of the light emitting unit (130) of the battery management system (100), thereby decreasing the intensity of light received at the light receiving unit (210) of the external battery management system (200). Through this, various embodiments of the present disclosure can maintain communication performance between the battery management system (100) and the external battery management system (200) through a negative feedback method even when dust accumulates on each light-emitting unit (130; 230) and light-receiving unit (110; 210) as the communication period between the battery management systems increases by using an optical feedback control method.

[0039] In the example described above, it is assumed that the light intensity decreases according to the accumulated use of the light emitting unit (130) of the battery management system (100), but the various embodiments of the present disclosure are not limited thereto and can be similarly applied to, for example, the case of the light intensity decrease according to the accumulated use of the light emitting unit (230) of the external battery management system (200).

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

[0041] Referring to FIG. 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 having communication information received from an external battery management system (200), a light emitting unit (130) that transmits light having communication information to the external battery management system (200), and a control unit (120). In the battery management system (100) illustrated in FIG. 2, only components related to the present embodiment are illustrated. Therefore, it will be understood by those skilled in the art related to the present embodiment that other general-purpose components may be further included in addition to the components illustrated in FIG. 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 the external battery management system (200) and generate a voltage based on the received light. The light receiving unit (110) of the battery management system (100) can include one or more photodiodes corresponding to semiconductor diodes having a function such as a photodetector according to one embodiment, and the photodiode included in the light receiving unit (110) has a PN junction or PIN structure, so that when light with sufficient photon energy is incident on the photodiode, mobile electrons and positive charge holes are generated, and photocurrent can be generated through the activity of electrons. The current thus generated can generate a voltage corresponding to the intensity of the light when it flows through a resistor. Meanwhile, in the present disclosure, the terms optical signal and light are used interchangeably with each other with the same meaning.

[0043] In one embodiment, the control unit (120) may be configured to check (e.g., sense) a voltage value of a voltage generated by the light receiving unit (110) corresponding 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 to adjust 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, 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 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) can 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 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) becomes the same as the designated target voltage value. At this time, the designated target voltage value may be determined based on the communication power consumption between the battery management system (100) and the external battery management system (200), according to one embodiment, or may be determined based on the minimum power consumption for maintaining 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 having communication information to an external battery management system (200). Similar to the light receiving unit (110) described above, the light emitting unit (130) of the battery management system (100) can include one or more photodiodes corresponding to semiconductor diodes having a function such as a photodetector, and can transmit light having an appropriate light intensity to the external battery management system (200) to perform optical feedback under control from the control unit (120) of the battery management system (100).

[0045]

[0046] FIGS. 3A and 3B are drawings for generally explaining the optical feedback process of a battery management system (100) and an external battery management system (200) according to one embodiment.

[0047] Referring to FIG. 3a, the entire optical feedback process within the battery management system (100) can be confirmed when the battery management system (100) and the external battery management system (200) according to one embodiment exchange signals with each other.

[0048] 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), and compares the target voltage value (411) with a voltage value (412) confirmed based on light received through the light receiving unit (110) of the battery management system (100) and transmits the result to the 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) through the current (470) reflecting the feedback voltage signal generated based on the comparison result between the target voltage value (411) set based on the communication power consumption in the control unit (120) and the voltage value (412) confirmed based on the light received through the light receiving unit (110), and as a result, the light receiving unit (110) of the battery management system (100) can be controlled so that the voltage value (411) of the voltage generated based on the light received from the external battery management system (200) becomes equal to the target voltage value (412).

[0049] Through the negative feedback as described above, the battery management system (100) can ensure that the confirmed voltage value (411) and the target voltage value (412) are maintained the same even when it detects that the voltage value (412) confirmed through the light receiving unit (110) of the battery management system (100) has decreased due to a weakening of the strength of the wireless communication signal between the battery management system (100) and the external battery management system (200). The operations performed by each component in the aforementioned optical feedback process will be individually described below.

[0050] FIG. 3b is a drawing for explaining the overall process 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 one embodiment.

[0051] Referring to FIG. 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 the intensity of light received by the light-receiving unit (210) of the external battery management system (200) decreases due to dust accumulating on the photodiode in the light-emitting unit (130) of the battery management system (100) or dust accumulating 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 voltage drop due to the resistance of the light-receiving unit (320) decreases due to a decrease in the current (315) flowing through the photodiode (310) of the light-receiving unit (210) of the external battery management system (200), the voltage (325) of the light-receiving unit may decrease. The decrease in the voltage (325) of the light-receiving unit of the external battery management system (200) may be transmitted to the light-emitting unit (230) connected to the light-receiving unit (210) of the external battery management system (200), and through this, the intensity of light having 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) may decrease, and the voltage generated by the light-receiving unit (110) of the battery management system (100) may also decrease. Through this, the control unit (120) of the battery management system (100) can detect that the intensity of 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) to transmit light of an appropriate intensity to the external battery management system (200) through appropriate compensation.

[0052]

[0053] FIG. 4a and FIG. 4b are drawings for explaining a control unit (120) of a battery management system (100) according to one embodiment.

[0054] Referring to FIG. 4A, a control unit (120) according to one embodiment can check (detect) a voltage value of a voltage generated by a light receiving unit (110) based on the intensity of light received from an external battery management system (200). According to one embodiment, the control unit (120) of the battery management system (100) includes: a first operational amplifier (410) that checks a voltage value of a voltage generated in response to the intensity of light received from the external battery management system (200), and then compares the checked voltage value (412) with a designated target voltage value (411) to output a duty voltage signal; a PWM (pulse width modulation) logic circuit (420) that determines a duty ratio for the duty voltage signal; a gate driver circuit (430) that is connected to the PWM logic circuit (420) and controls the duty ratio; It may include a buck boost converter circuit (440) connected to a gate driver circuit (430) and outputting a feedback voltage signal (446) based on a driving voltage (445) and a duty ratio.

[0055] A first operational amplifier (410) included in a control unit (120) of a battery management system (100) according to one embodiment can output a duty voltage signal to be input to a PWM logic circuit (420) by taking as input a voltage value (412) confirmed by the control unit (120) and a designated target voltage value (411). For example, the first operational amplifier (410) can output an increasing duty voltage signal as the size of the difference between the confirmed voltage value (412) and the designated target voltage value (411) increases.

[0056] A PWM logic circuit (420) included in a control unit (120) of a battery management system (100) according to one embodiment can modulate the pulse width of a duty voltage signal received from a first operational amplifier (410) to determine a duty ratio of the duty voltage signal, and transmit the determined duty ratio to a gate driver circuit (430).

[0057] A gate driver circuit (430) included in a control unit (120) of a battery management system (100) according to one embodiment can control a duty ratio determined through a PWM logic circuit (420). For example, when a duty voltage signal increases, the gate driver circuit (430) can increase the duty ratio based on the duty voltage signal.

[0058] A buck-boost converter circuit (440) included in a control unit (120) of a battery management system (100) according to an embodiment may receive a duty ratio from a gate driver circuit (430) and output a feedback voltage signal (446) based on a driving voltage (445) and the duty ratio. For example, the buck-boost converter circuit (440) may increase and output a feedback voltage signal (446) when the duty ratio of the signal received from the gate driver circuit (430) increases. By this operation, the buck-boost converter circuit (44) according to an embodiment of various embodiments of the present disclosure may output a variable feedback voltage signal (446).

[0059] In one embodiment, when the intensity of light having communication information received from an external battery management system (200) decreases, the voltage generated by the light receiving unit (110) of the battery management system (100) may decrease, and the duty voltage signal generated by the first operational amplifier (410) may increase. Accordingly, when the duty ratio 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 ratio through the gate driver circuit (430) connected to the PWM logic circuit (420), and as the duty ratio increases, the feedback voltage signal (446), which is an output value of the buck-boost converter circuit (440) driven by the driving voltage (445), may increase.

[0060]

[0061] Referring to FIG. 4B, the control unit (120) of the battery management system (100) according to one embodiment may include a second operational amplifier (451) for providing a previously generated feedback voltage signal (446) to the light emitting unit (130) and a negative feedback circuit (450) including a MOSFET element (452). 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 in the MOSFET element (452). Meanwhile, 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).

[0062] For example, as described above in FIG. 4A, when the feedback voltage signal (446), which is an 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 light-emitting resistor (460) may increase according to 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) may increase the intensity of light transmitted from the light-emitting unit (130) to the external battery management system (200) through the current (470) reflecting the increased feedback voltage signal (446). At this time, the MOSFET element (452) may be a PMOS element according to one embodiment, and the second operational amplifier (451) may apply a feedback voltage signal (446) to the drain terminal of the PMOS element, but the embodiment of the negative feedback circuit (450) according to the present disclosure is not limited to the specific case mentioned.

[0063]

[0064] FIG. 5 is a flowchart illustrating the operation of a battery management system performing optical feedback wireless communication according to one embodiment.

[0065] Referring to FIG. 5, in step (510), the battery management system (100) according to one embodiment may first generate a voltage based on light having communication information transmitted by the external battery management system (100) in response to light transmitted from the battery management system (100) to the external battery management system (200). For example, the battery management system (100) may receive light having communication information from the external battery management system (200) through the light receiving unit (110) described in FIGS. 3A and 3B, and generate a voltage based on the light having the received communication information.

[0066] In step (520), the control unit (120) of the battery management system (100) according to one embodiment can check the voltage value generated by the light receiving unit (110) corresponding to 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, the battery management system (100) compares the voltage value generated in advance with the designated target voltage value as described in FIGS. 3A and 3B , 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 a predetermined specific value by a specific limit), it can determine that the intensity of light having communication information received from the external battery management system (200) through the light receiving unit (110) has weakened, and can check that the voltage value of the external battery management system (200) has decreased correspondingly.

[0067] 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 checked 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), the PWM logic circuit (420), the gate driver circuit (430), the buck-boost converter circuit (440), and the negative feedback circuit (450) included in the control unit (120) as described in FIGS. 4A and 4B. For example, when the checked 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) to increase through the control unit (120). According to one embodiment, the control unit (120) may create a lookup table in advance in which the intensity of light to be transmitted to the external battery management system (200) corresponds to the degree of decrease in the confirmed voltage value, store the lookup table in a memory device, and then use the lookup table to create a voltage signal capable of generating the required intensity of light.

[0068] In step (540), the battery management system (100) can transmit light having communication information to an external battery management system (200). For example, the battery management system (100) can transmit light with controlled intensity to the external battery management system (200) through the control unit (120).

[0069] In this way, through the optical feedback process, even when the light transmission ability is reduced due to aging, dust, or condensation 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), the communication quality can be maintained at a constant level.

[0070] Figure 6 is a block diagram showing a hardware configuration that implements a control unit included in a battery management system (100) according to the present invention.

[0071] A control unit (120) according to one embodiment disclosed in this document may include an MCU (122), a memory (124), a communication I / F (126), and an input / output I / F (128). The MCU (122) is a micro controller unit that executes various programs stored in the memory (124), processes various data used in these programs, and is a processor that performs the functions of the control unit (120).

[0072] The memory (124) can store operation data of various programs related to the operation of the battery management system for the operation of the control unit (120). A plurality of such memories (124) may be provided as needed. The memory (124) may be a volatile memory or a non-volatile memory. As a volatile memory, the memory (124) may use RAM, DRAM, SRAM, etc. As a non-volatile memory, the memory (124) may use ROM, PROM, EAROM, EPROM, EEPROM, flash memory, etc. The examples of the memories (124) listed above are merely examples and are not limited thereto.

[0073] The communication I / F (126) is a configuration capable of transmitting and receiving various data with the server, and may be various devices capable of supporting wired or wireless communication. For example, a program or various data for the operation of the control unit (120) may be transmitted and received from a separately provided external server via wired or wireless communication via the communication I / F (126). The input / output I / F (128) may provide an interface that connects an input device (not shown) such as a keyboard, mouse, or touch panel, and an output device such as a display (not shown) to the MCU (122) to enable data transmission and reception.

[0074] The present embodiment may be represented by functional block configurations and various processing steps. These functional blocks may be implemented by various hardware and / or software configurations that perform specific functions. For example, the embodiment may employ direct circuit configurations such as memory, processing, logic, look-up tables, etc., which may perform various functions under the control of one or more microprocessors or other control devices. Similarly, the present embodiment may be implemented in a programming or scripting language such as C, C++, Java, assembler, etc., including various algorithms implemented as a combination of data structures, processes, routines, or other programming configurations. Functional aspects may be implemented as algorithms that execute on one or more processors. Furthermore, the present embodiment may employ conventional techniques for electronic configuration, signal processing, and / or data processing. Terms such as "mechanism," "element," "means," and "composition" can be used broadly and are not limited to mechanical or physical structures. These terms can also encompass a series of software routines, such as those associated with a processor.

[0075] Although the present disclosure has been described above with reference to embodiments thereof, it will be understood by those skilled in the art or having ordinary knowledge in the art that various modifications and changes to the various embodiments of the present disclosure may be made without departing from the technical scope of the various embodiments of the present disclosure as set forth in the claims below. Accordingly, the technical scope of the various embodiments of the present disclosure should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims

1. In the battery management system, A light receiving unit that receives light having 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 having communication information to the external battery management system; and Including a control unit, The above control unit, Checking the voltage value of the voltage generated in the light receiving unit based on the intensity of light received from the external battery management system, A battery management system configured to control the intensity of light transmitted from the light emitting unit based on the voltage value confirmed above.

2. In paragraph 1, The above control unit, When the light intensity received from the external battery management system decreases, Controlling the intensity of light transmitted from the above light emitting unit to the external battery management system to increase, Battery management system.

3. In paragraph 1, The above control unit, Adjusting the intensity of light transmitted from the light emitting unit to the external battery management system so that the voltage value confirmed above and the designated target voltage value become the same. Battery management system.

4. In paragraph 3, The target voltage value specified above is, Determined based on the communication power consumption between the battery management system and the external battery management system, Battery management system.

5. In paragraph 1, The above control unit, A first operational amplifier that compares the above-mentioned confirmed voltage value with a specified target voltage value and outputs a duty voltage signal; A PWM (pulse width modulation) logic circuit that determines a duty ratio for the above duty voltage signal; A gate driver circuit connected to the above PWM logic circuit and controlling the duty ratio; A buck boost converter circuit connected to the gate driver circuit and outputting a feedback voltage signal based on the driving voltage and the duty ratio; and A second operational amplifier and a MOSFET element for providing the feedback voltage signal to the light emitting unit, Containing a negative feedback circuit, Battery management system.

6. In paragraph 5, The above first operational amplifier, The larger the difference between the voltage value confirmed above and the target voltage value specified above, Increases the above duty voltage signal and outputs it, Battery management system.

7. In paragraph 5, The above buck-boost converter circuit, If the above duty ratio increases, Increases the above feedback voltage signal and outputs it, Battery management system.

8. In paragraph 5, The above negative feedback circuit, Providing the feedback voltage signal to the light emitting unit based on the current flowing through the MOSFET element, Battery management system.

9. In paragraph 5, The above MOSFET device, It is a PMOS device, The above second operational amplifier, Applying the feedback voltage signal to the drain terminal of the PMOS device, Battery management system.

10. In an optical feedback communication method of a battery management system, A step of generating a voltage corresponding to the intensity of the received light based on light having communication information received from an external battery management system; A step of checking the generated voltage value; A step of adjusting the intensity of light transmitted from the light emitting unit based on the voltage value confirmed above; and comprising a step of transmitting light having communication information to the external battery management system; Optical feedback communication method.

11. In the battery management system, A light receiving unit that receives light having 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 having communication information to the external battery management system; and Including a control unit, The above control unit, An optical feedback circuit configured to check the voltage value of the voltage generated by the light receiving unit corresponding to the intensity of light received from the external battery management system, and to adjust the intensity of light transmitted from the light emitting unit based on the checked voltage value, A battery management system, wherein the optical feedback circuit comprises a converter circuit configured to generate a variable voltage signal for a light signal to be transmitted from the light emitting unit to the external battery management system based on the verified voltage value.

12. In paragraph 11, The above optical feedback circuit, A first operational amplifier that compares the above-mentioned confirmed voltage value with a specified target voltage value and outputs a duty voltage signal; A PWM (pulse width modulation) logic circuit that determines a duty ratio for the above duty voltage signal; A gate driver circuit connected to the PWM logic circuit and controlling the duty ratio; and A battery management system further comprising a second operational amplifier and a MOSFET element for providing the feedback voltage signal to the light emitting unit.

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