Power control system for LED electronic display boards based on an emergency battery

Abstract

An emergency battery-based LED display power control system for supplying power to an LED display composed of a plurality of color LED elements according to an embodiment of the present invention comprises: a dual power driving unit that receives AC from an AC power supply unit, converts it into DC, and provides a first power path with a DC voltage range of 2.8 to 3.3 V and a second power path with a DC voltage range of 3.3 to 3.8 V; an output voltage measuring unit that measures the output status of a first DC voltage output from the first power path and a second DC voltage output from the second power path; an emergency battery unit that provides a backup power path through a battery provided when an abnormality occurs in the voltage output from the dual power driving unit; and a power path control unit that, when the output voltage of at least one of the first DC voltage and the second DC voltage deviates from a critical range as a result of measurement by the output voltage measuring unit, blocks the power path of the corresponding DC voltage and activates the backup power path of the emergency battery unit to replace the blocked power path, wherein the DC power supplied through the first power path is supplied to a red LED element, and through the second power path The supplied DC power is connected in parallel to the green LED and blue LED elements.

Description

Technology Field

[0001] The present invention relates to an emergency battery-based LED display power control system, and more specifically, to an emergency battery-based LED display power control system that analyzes the status of the LED display power path in real time and selectively activates a backup power path of the emergency battery unit when an abnormality occurs in the power path. Background Technology

[0002] Recently, the use of LED displays has been expanding in various fields, including outdoor advertising displays, traffic information displays, and public information display devices. Conventional LED displays utilize an SMPS (Switching Mode Power Supply) to provide power to LED components; however, a problem existed where the entire display function would cease if a power supply failure occurred. In particular, due to the nature of continuous operation for extended periods, there is a high likelihood of accumulated degradation in components such as capacitors and switching elements within the SMPS. This can lead to output voltage instability, increased high-frequency ripple noise, and LED malfunction. However, conventional methods were limited to simply supplying battery power as a backup after a power failure occurred, lacking the technology to analyze signs of power failure in advance or selectively operate emergency power based on the condition of the power path. Furthermore, despite the differing electrical characteristics of red, green, and blue LED components, conventional technology applied a single power structure or a uniform power control method without considering these differences, resulting in reduced power efficiency and display stability. In addition, there was a problem in that technology was not sufficiently provided to extend the system's lifespan or optimize the timing of emergency battery usage by properly controlling the brightness of the LED display even when power path degradation was progressing.

[0003] This specification describes an emergency battery-based LED display power control system that improves upon these problems by analyzing the status of the LED display power path in real time and selectively activating the backup power path of the emergency battery unit in the event of a power path abnormality.

[0004] [Prior Literature]

[0005] Registered Patent 10-2642262 The problem to be solved

[0006] The present invention aims to provide an emergency battery-based LED display power control system that analyzes the power path status of the LED display in real time to diagnose deterioration or abnormal conditions of the power path, and selectively activates the backup power path of the emergency battery unit when an abnormality occurs, thereby enabling the display function of the LED display to be stably maintained. means of solving the problem

[0007] An emergency battery-based LED display power control system for supplying power to an LED display composed of a plurality of color LED elements according to an embodiment of the present invention comprises: a dual power driving unit that receives AC from an AC power supply unit, converts it into DC, and provides a first power path with a DC voltage range of 2.8 to 3.3 V and a second power path with a DC voltage range of 3.3 to 3.8 V; an output voltage measuring unit that measures the output status of a first DC voltage output from the first power path and a second DC voltage output from the second power path; an emergency battery unit that provides a backup power path through a battery provided when an abnormality occurs in the voltage output from the dual power driving unit; and a power path control unit that, when the output voltage of at least one of the first DC voltage and the second DC voltage deviates from a critical range as a result of measurement by the output voltage measuring unit, blocks the power path of the corresponding DC voltage and activates the backup power path of the emergency battery unit to replace the blocked power path, wherein the DC power supplied through the first power path is supplied to a red LED element, and through the second power path The supplied DC power is connected in parallel to the green LED and blue LED elements.

[0008] An LED display power control system according to one embodiment of the present invention further includes a reverse current prevention element connected to the rear end of the first power path, the second power path, and the backup power path, respectively. When the first DC voltage or the second DC voltage detected in real time by the output voltage measuring unit rises or falls while deviating from a corresponding voltage range, the power path control unit connects the backup power path of the emergency battery unit in parallel with the power path of the DC voltage for a set time before cutting off the power path of the DC voltage. At this time, the reverse current prevention element provided in the power path of the DC voltage and the backup power path is conducted so that reverse current caused by the potential difference between different power paths during parallel connection is cut off. After the set time has elapsed, the power path control unit cuts off the power path of the DC voltage.

[0009] An LED display power control system according to one embodiment of the present invention further comprises an impedance measuring unit that measures the internal impedance of the emergency battery unit in real time by periodically applying a test current to the emergency battery unit for a set time when the first DC voltage or the second DC voltage detected in real time by the output voltage measuring unit is within a corresponding voltage range, and a system management unit that generates a battery replacement alarm signal for the emergency battery unit and transmits it to an administrator terminal of the LED display when the internal impedance value of the emergency battery unit measured by the impedance measuring unit exceeds a set degradation threshold, and the system management unit provides information on the power path connected to the LED element constituting the LED display to the administrator terminal in real time.

[0010] An LED display power control system according to one embodiment of the present invention further includes a fault indication diagnosis unit that, when the first DC voltage or the second DC voltage detected in real time by the output voltage measuring unit is within a corresponding voltage range, receives output data of the DC voltage, filters ripple components in the high-frequency region from the received output data, and diagnoses fault indications of the internal components of the dual power driving unit in real time by comparing the amplitude fluctuation and occurrence frequency of the filtered high-frequency ripple components with previously stored component-specific degradation pattern data.

[0011] The fault symptom diagnosis unit calculates the remaining lifespan of the components of the DC voltage power path that matches the result of comparing the amplitude fluctuation and occurrence frequency of the filtered high-frequency ripple component with the degradation pattern data for each component, and the power path control unit switches to a component protection mode that reduces the brightness of the color LED component connected to the DC voltage power path to below a set reference value if the calculated remaining lifespan is less than a set period, and subsequently, if the amplitude fluctuation and occurrence frequency of the high-frequency ripple component filtered by the fault symptom diagnosis unit exceeds a critical noise level that causes malfunction of the color LED component, the backup power path of the emergency battery unit is connected to the color LED component, and the existing connected power path is cut off, and the power path control unit reduces the time for which power is applied to the color LED component or reduces the brightness of the color LED component by varying the value of the internal current control register of the color LED component.

[0012] An LED display power control system according to one embodiment of the present invention further comprises a power analysis unit that calculates the hourly power consumption of the first power path and the second power path when not in the element protection mode and calculates the hourly power consumption consumed through the color LED element in the element protection mode, and a driving time calculation unit that calculates the driving time of the LED display using the emergency battery based on the remaining capacity data of the emergency battery unit and the hourly power consumption of the first power path and the second power path when not in the element protection mode. The power path control unit compares the remaining lifespan of the elements of the power path in the element protection mode with the driving time calculated by the driving time calculation unit, and if the remaining lifespan is greater than or equal to the driving time or is smaller than the driving time by a difference of less than a set time, it continues to drive the LED display in the element protection mode, and if the remaining lifespan is smaller than the driving time by a difference of more than a set time, it cuts off the first power path and the second power path and activates the backup power path of the emergency battery unit.

[0013] An LED display power control system according to an embodiment of the present invention comprises: a power analysis unit that calculates the hourly power consumption of the first power path and the second power path when the element protection mode is not active, and calculates the hourly power consumption consumed through the color LED element in the element protection mode; a power cost reduction calculation unit that calculates the power cost reduced by switching to the element protection mode based on the hourly power consumption data of the first power path and the second power path when the element protection mode is not active and the hourly power consumption data in the element protection mode; an expected profit comparison unit that compares whether the advertising revenue obtainable by driving the LED display based on the remaining capacity data of the emergency battery unit exceeds the sum of the sales revenue obtainable by selling the remaining capacity data of the emergency battery unit and the power cost reduced by the power cost reduction calculation unit; and a reverse transmission unit that controls the transmission of the power from the remaining capacity data of the emergency battery unit to an external power grid to sell the power when the advertising revenue is less than the sum of the sales revenue and the power cost reduced due to the element protection mode at the point when both the first power path and the second power path are cut off. The control unit further includes a power path control unit, which activates the backup power path of the emergency battery unit only when the advertising revenue is greater than or equal to the sum of the sales revenue and the power cost saved due to the device protection mode at the point when both the first power path and the second power path are cut off. Effects of the invention

[0014] The emergency battery-based LED display power control system of the present invention proactively connects a backup power path in parallel as soon as the commercial voltage deviates from the normal range, thereby fundamentally preventing blackouts in the display caused by momentary power interruptions. Furthermore, by cutting off the existing power supply after a set time has elapsed, it enables stable operation of the LED display even when there are issues with the operation of the commercial power supply. Additionally, even while the commercial power is operating, the system can determine the replacement time of the emergency battery by measuring its impedance. By activating a component protection mode that reduces brightness when the remaining lifespan of a component diagnosed through high-frequency ripple analysis of the output voltage falls below a threshold, the system can slow down the degradation rate of components and physically delay the occurrence of failure, thereby improving the hardware reliability of the system. Moreover, when the commercial power is cut off, the system can generate separate value-added revenue by comparing real-time advertising revenue, revenue from reverse power transmission from the emergency battery, and reduced power costs in the component protection mode from a profit and loss perspective. Based on this, it can generate separate value-added revenue by selling the battery power of the display even in situations where display operation is impossible. Brief explanation of the drawing

[0015] FIG. 1 is a block diagram schematically illustrating an LED display power control system according to one embodiment of the present invention. Figure 2 is a diagram illustrating the process of switching the power path in the present invention. FIG. 3 is a flowchart illustrating the process of generating a battery replacement alarm signal in the present invention. FIG. 4 is a flowchart illustrating the process of switching to the device protection mode in the present invention. FIG. 5 is a flowchart illustrating the process of driving an LED display board in device protection mode and the process of activating a backup power path of an emergency battery unit in the present invention. FIG. 6 is a flowchart illustrating the case in which a backup power path is activated and the remaining amount data of the emergency battery unit is transmitted to an external power grid at the time when the first power path and the second power path are cut off in the present invention. Specific details for implementing the invention

[0016] In the following, embodiments of the present disclosure may be described in detail with reference to the attached drawings. However, since various modifications may be made to the embodiments, the scope of the application is not limited or restricted by these embodiments. It should be understood that all modifications, equivalents, and substitutions to the embodiments may be included within the scope of the application.

[0017] Specific structural or functional descriptions of the embodiments are disclosed for illustrative purposes only and may be modified and implemented in various forms. Accordingly, the embodiments are not limited to the specific disclosed forms, and the scope of this specification may include modifications, equivalents, or substitutions that fall within the technical concept.

[0018] Terms such as "first" or "second" may be used to describe various components, but these terms may be interpreted solely for the purpose of distinguishing one component from another. For example, a first component may be named a second component, and similarly, a second component may be named a first component.

[0019] When it is stated that a component is "connected" to another component, it should be understood that it may be directly connected to or coupled with that other component, or that there may be other components in between.

[0020] The terms used in the embodiments are for illustrative purposes only and should not be interpreted as intended to be limiting. A singular expression may include a plural expression unless the context clearly indicates otherwise. In this specification, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0021] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the embodiments pertain. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0022] In the present disclosure, the "system" may include, but is not limited to, electronic devices and electronic circuit devices. For example, the system may be composed of one or more server devices. As another example, the system may be composed of one or more cloud devices. As yet another example, the system may be configured and operated with both server devices and cloud devices.

[0023] In the present disclosure, "module" or "part" may be implemented as a processor and memory. "Processor" may be broadly interpreted to include a general-purpose processor, a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), a controller, a microcontroller, a state machine, etc. In some contexts, "processor" may refer to an application-specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc. "Processor" may also refer to a combination of processing devices, such as, for example, a combination of a DSP and a microprocessor, a combination of multiple microprocessors, a combination of one or more microprocessors combined with a DSP core, or any other combination of such configurations. Additionally, "memory" may be broadly interpreted to include any electronic component capable of storing electronic information. "Memory" may refer to various types of processor-readable media, such as Random Access Memory (RAM), Read-Only Memory (ROM), Non-Volatile Random Access Memory (NVRAM), Programmable Read-Only Memory (PROM), Erasable-Programmable Read-Only Memory (EPROM), Electrically Erasable PROM (EEPROM), Flash Memory, Magnetic or Optical Data Storage Devices, Registers, etc. If a processor can read information from memory and / or write information to memory, the memory is said to be in an electronic communication state with the processor. Memory integrated into a processor is in an electronic communication state with the processor.

[0024] In addition, when describing with reference to the attached drawings, identical components are assigned the same reference numeral regardless of drawing symbols, and redundant descriptions thereof may be omitted. When describing embodiments, if it is determined that a detailed description of related prior art could unnecessarily obscure the essence of the embodiment, such detailed description may be omitted.

[0025] FIG. 1 is a block diagram schematically showing an LED display power control system (1000) according to one embodiment of the present invention, FIG. 2 is a diagram explaining the process of switching the power path in the present invention, and FIG. 3 is a flowchart explaining the process of generating a battery replacement alarm signal in the present invention.

[0026] Referring to FIG. 1, an emergency battery-based LED display power control system (1000) that supplies power to an LED display (300) composed of a plurality of color LED elements may include an AC power unit (101), a dual power driving unit (102), an output voltage measuring unit (103), an emergency battery unit (104), a power path controlling unit (105), an impedance measuring unit (106), and a system management unit (107).

[0027] Referring to FIG. 1, the dual power drive unit (102) can receive 220V AC power from the AC power unit (101). The dual power drive unit (102) may include a Switching Mode Power Supply (SMPS) to convert AC power into DC power and create a first power path (121) and a second power path (122) having different voltage ranges. As an example of the present invention, the dual power drive unit (102) may receive AC from the AC power unit (101), convert it into DC, and provide a first power path (121) with a DC voltage range of 2.8 to 3.3V and a second power path (122) with a DC voltage range of 3.3 to 3.8V. At this time, the DC power supplied through the first power path (121) is supplied to the red LED element, and the DC power supplied through the second power path (122) can be supplied by connecting it in parallel to the green LED element and the blue LED element. The reason for configuring the first power path (121) and the second power path (122) separately is that the required driving voltage and power consumption for each color LED element are different. In particular, while the red LED element can operate at a relatively low driving voltage, the green LED element and the blue LED element require a relatively high driving voltage and current; therefore, the dual power driving unit (102) can independently provide power paths corresponding to the characteristics of the color LED elements.

[0028] The output voltage measuring unit (103) can measure the output state of the first DC voltage output from the first power path (121) and the second DC voltage output from the second power path (122).

[0029] The output voltage measuring unit (103) can measure the voltage magnitude, voltage fluctuation range, and voltage stability status of the first DC voltage and the second DC voltage in real time. The output voltage measuring unit (103) includes a voltage distribution circuit connected to the first power path (121) and the second power path (122), respectively, to convert the output DC voltage into a measurable voltage level. Output data generated by the output voltage measuring unit (103) can be collected and stored in real time.

[0030] The emergency battery unit (104) can provide a backup power path through a battery (not shown) provided in the event of an abnormality in the voltage output from the dual power drive unit (102). The emergency battery unit (104) may include a rechargeable secondary battery and may be configured to maintain a charged state when the output state of the dual power drive unit (102) is normal. The emergency battery unit (104) may selectively form a backup power path that replaces the first power path (121) or the second power path (122) according to the control of the power path control unit (105) to be described later.

[0031] The power path control unit (105) can cut off the power path of the corresponding DC voltage when the output voltage of at least one of the first DC voltage and the second DC voltage deviates from the critical range as a result of measurement by the output voltage measurement unit (103), and can activate the backup power path of the emergency battery unit (104) to replace the cut-off power path. The function of the power path control unit (105) will be explained in more detail below.

[0032] Referring to FIGS. 1 and 2, when a first DC voltage or a second DC voltage detected in real time by an output voltage measuring unit (103) rises or falls while deviating from a corresponding voltage range, the power path control unit (105) may connect the backup power path of the emergency battery unit (104) in parallel with the power path of the DC voltage for a set time before cutting off the power path of the DC voltage. At this time, a reverse current prevention element (not shown) provided in the power path of the DC voltage and the backup power path conducts, so that reverse current caused by the potential difference between different power paths during parallel connection can be cut off. After the set time has elapsed, the power path control unit (105) may cut off the power path of the DC voltage.

[0033] In this way, preemptively connecting backup power paths in parallel is intended to prevent the blackout phenomenon in which the LED display is momentarily shut down when the commercial power supply is unstable. That is, by preemptively initiating the backup power paths in parallel, the continuity of power supply is secured, and any heterogeneous potential difference between the commercial power supply and the battery that may occur during this process can be offset by the reverse bias blocking characteristics of the reverse current prevention device (diode or FET device) placed at the rear end of both paths. Then, after a set time has elapsed, the power path control unit (105) blocks the first power path (121) and the second power path (122) so that power can be stably supplied to the LED device through the backup power paths.

[0034] Referring to FIGS. 1 and 3, the impedance measuring unit (106) can measure the internal impedance of the emergency battery unit (104) in real time by periodically applying a test current to the emergency battery unit for a set time when the first DC voltage or the second DC voltage detected in real time by the output voltage measuring unit (103) is within the corresponding voltage range.

[0035] The impedance measuring unit (106) can be controlled to apply a test current only when the commercial power is in a normal state (both the first power path (121) and the second power path (122) are operating normally). (S31) The test current may be a micro-current that does not affect the charge state of the emergency battery unit (104) or the total power output. At this time, the impedance measuring unit (106) can detect minute voltage fluctuations and phase differences occurring across the emergency battery unit (104) upon application of the test current, and derive the complex impedance value inside the battery by applying this to a calculation algorithm based on Ohm's law ($R=V / I$). (S32)

[0036] When the internal impedance value of the emergency battery unit (104) measured by the impedance measurement unit (106) of the system management unit (107) exceeds a set degradation threshold, a battery replacement alarm signal for the emergency battery unit (104) can be generated and transmitted to the manager terminal (200) of the LED display board (300). (S33) When the system management unit (107) generates the battery replacement alarm signal, it can classify the predicted lifespan information of the emergency battery unit (104) and the replacement urgency based on the trend of change in the internal impedance value and transmit them together to the manager terminal (200). In addition, the system management unit (107) can provide information on the power path connected to the LED element constituting the LED display board (300) in real time to the manager terminal (200). Information regarding the power path provided to the administrator terminal (200) may include real-time visual data regarding which path, among the first power path (121), the second power path (122), or the backup power path, is receiving power for each color LED element.

[0037] FIG. 4 is a flowchart illustrating the process of switching to the device protection mode in the present invention.

[0038] Referring to FIGS. 1 and FIGS. 4, an LED display power control system (1000) according to one embodiment of the present invention may further include a fault symptom diagnosis unit (108). When a first DC voltage or a second DC voltage detected in real time by an output voltage measurement unit (103) is within a corresponding voltage range, the fault symptom diagnosis unit (108) receives output data of the corresponding DC voltage (S41), filters ripple components in the high-frequency region from the received output data (S42), and diagnoses fault symptoms of an internal component of a dual power driving unit (102) in real time by comparing the amplitude fluctuation and occurrence frequency of the filtered high-frequency ripple components with previously stored component-specific degradation pattern data (S43).

[0039] The fault symptom diagnosis unit (108) can precisely extract only high-frequency ripple components, which are fine noise in the range of several kHz to several MHz, by applying a high-pass filter or a band-pass filter to the output data, excluding basic DC components and low-frequency fluctuation components. At this time, the previously stored degradation pattern data for each component may include ripple amplitude amplification characteristics due to the increase in equivalent series resistance of capacitors in the power supply unit, or a frequency spectrum of noise generation in a specific frequency band due to the aging of switching elements. Accordingly, the fault symptom diagnosis unit (108) can detect the abnormal degradation progress of a specific capacitor or switching element provided internally at a stage before an actual hardware disconnection or shutdown failure occurs by comparing and analyzing the waveform characteristics of the filtered ripple with the degradation pattern data in real time.

[0040] The fault symptom diagnosis unit (108) can calculate the remaining lifespan of the components in the power path of the DC voltage that matches the result of comparing the amplitude fluctuation and occurrence frequency of the filtered high-frequency ripple component with the degradation pattern data for each component (S44). (S45) The fault symptom diagnosis unit (108) can quantitatively derive the capacitance reduction rate of the capacitor or the temperature rise trend of the junction of the switching component through the analysis of the comparison result, and calculate the remaining lifespan of the components in the power path by substituting this into a previously known lifespan calculation formula for each component.

[0041] The power path control unit (105) may switch to a device protection mode that reduces the brightness of a color LED element connected to the power path of the corresponding DC voltage to below a set reference value when the calculated remaining lifespan is less than the set period. (S46) The power path control unit (105) may reduce the brightness of the color LED element by reducing the time power is applied to the color LED element or by varying the value of the internal current control register of the color LED element. Subsequently, if the amplitude fluctuation and occurrence frequency of high-frequency ripple components filtered by the fault symptom diagnosis unit (108) exceed a threshold noise level that causes the color LED element to malfunction, the backup power path of the emergency battery unit (104) may be connected to the color LED element, and the existing connected power path may be cut off.

[0042] The power path control unit (105) activates a component protection mode to reduce the current load applied to the components and slow down the rate of degradation when the remaining lifespan falls below a set period, thereby physically delaying the time of the final occurrence of failure. However, if degradation accelerates despite these mitigation measures and the noise of high-frequency ripple components exceeds a critical noise level, the power path control unit (105) can determine that a critical situation in which distortion or malfunction of the display screen may occur in real time is a critical situation. In this case, the power path control unit (105) connects the backup power path of the standby emergency battery unit (104) to the corresponding color LED component, and once it is confirmed that the backup power warning is safely connected, the existing power path (first power path (121) and second power path (122)) is completely disconnected and cut off, thereby removing the risk factor of the corresponding power path from the system (1000) of the present invention.

[0043] FIG. 5 is a flowchart for explaining the process of driving the LED display board (300) in the device protection mode and the process of operating the backup power path of the emergency battery unit (104) in the present invention.

[0044] Referring to FIGS. 1 and FIGS. 5, the emergency battery-based LED display power control system (1000) of the present invention may further include a power analysis unit (109) and a driving time calculation unit (110).

[0045] The power analysis unit (109) can calculate the hourly power consumption of the first power path (121) and the second power path (122) when the device protection mode is not active, and can calculate the hourly power consumption consumed through the color LED device in the device protection mode. The power analysis unit (109) records the reference power consumption pattern data during normal operation when the device protection mode is not active in real-time for each of the first power path (121) and the second power path (122), and can calculate the actual power consumption according to the internal current and driving time of the color LED device reduced when entering the device protection mode as independent data that can be compared with each other.

[0046] The operating time calculation unit (110) can calculate the operating time of the LED display board (300) using the emergency battery based on the remaining capacity data of the emergency battery unit (104) and the hourly power consumption of the first power path (121) and the second power path (122) when the device protection mode is not applied. The operating time calculation unit (110) can calculate the theoretical maximum operating limit time by assuming a situation where the dual power driving unit (102) is completely shut down and the display board must be turned on using only the power of the emergency battery unit (104), and by dividing the current remaining battery capacity (Wh) by the hourly total power consumption (W) in a pure normal state where the device protection mode is not applied. The operating time calculated in this way is the time during which the display board's original normal image quality can be maintained without artificial reduction in brightness, and can function as a quantitative indicator for determining the control direction by comparing it with the remaining lifespan of the hardware by the power path control unit (105), which will be described later.

[0047] The power path control unit (105) compares the remaining lifespan of the components in the power path in component protection mode with the driving time calculated by the driving time calculation unit (110) (S33). If the remaining lifespan is greater than or equal to the driving time, or is smaller than the driving time by a difference of less than the set time, the LED display (300) is continuously driven in component protection mode (S34_1). If the remaining lifespan is smaller than the driving time by a difference of more than the set time, the first power path (121) and the second power path (122) are blocked, and the backup power path of the emergency battery unit (104) is activated (S34_2). This is to prevent system downtime caused by sudden damage to the components by comparing the remaining lifespan of the components in the power path (121, 122) with the time that can be driven by the emergency battery. That is, if it is determined that the remaining lifespan of the component is longer than the battery operating time and that the commercial power side component can maintain minimum stability until the battery is discharged, the power path control unit (105) can operate the commercial power continuously in a component protection mode to conserve the consumption of the emergency battery. On the other hand, if the degradation state of the component is severe and there is a risk that the power supply unit will be completely destroyed before the time the battery can sustain it (when the remaining lifespan is significantly shorter than the operating time), the power path control unit (105) can preemptively cut off the commercial power path (121, 122) and forcibly switch to the backup power path before secondary damage caused by the component's failure spreads to the LED display panel at the rear end.

[0048] FIG. 6 is a flowchart for explaining the case in which a backup power path is activated and the remaining amount data of the emergency battery unit (104) is transmitted to an external power grid when the first power path (121) and the second power path (122) are cut off in the present invention.

[0049] Referring to FIGS. 1 and FIGS. 6, the emergency battery-based LED display power control system (1000) of the present invention may further include a power saving cost calculation unit (111), an expected profit comparison unit (112), and a reverse power transmission control unit (113).

[0050] The power cost reduction calculation unit (111) can calculate the power cost reduced by switching to the device protection mode based on the hourly power usage data of the first power path (121) and the second power path (122) when not in device protection mode, and the hourly power usage data in the device protection mode. The power cost reduction calculation unit (111) can calculate the real-time power reduction amount by subtracting the power usage reduced by entering the device protection mode from the power usage in the normal operating state, and calculate the accumulated power cost reduced by applying the pre-set time-based and seasonal power rate unit prices thereto.

[0051] The expected profit comparison unit (112) can compare whether the advertising revenue obtained by driving the LED display (300) based on the remaining amount data of the emergency battery unit (104) exceeds the sum of the sales revenue obtained by selling the remaining amount data of the emergency battery unit (104) and the reduced power cost calculated by the reduced power cost calculation unit (111). The expected profit comparison unit (112) can compare the commercial advertising profit obtained by keeping the display on continuously with the opportunity cost profit obtained by turning off or restricting the display (battery power sales amount + electricity cost saved due to the component protection mode).

[0052] The reverse power transmission control unit (113) can control the transmission of the remaining power data of the emergency battery unit (104) to an external power grid to sell the power when the advertising revenue is less than the sum of the sales revenue and the power cost saved due to the device protection mode at the point when both the first power path (121) and the second power path (122) are cut off. (S61_2)

[0053] If the reverse power transmission control unit (113) determines that it is more economically advantageous to sell battery power than to transmit to the display board when commercial power is cut off, it can operate a bidirectional inverter equipped internally to convert the DC power of the emergency battery unit (104) into power synchronized with the AC standard of the external commercial power grid. By transmitting the converted power to the external power grid through a power grid connection device, the reverse power transmission control unit (113) can generate separate value-added revenue by selling the battery power of the display board even when the display cannot perform its original function due to a disaster or emergency situation.

[0054] The power path control unit (105) can activate the backup power path of the emergency battery unit (104) only when the advertising revenue is greater than the sum of the sales revenue and the power cost saved due to the device protection mode at the point when both the first power path (121) and the second power path (122) are cut off (S61_1). That is, the power path control unit (105) can drive the display only in a valid situation where the commercial value generated when the limited power of the emergency battery is supplied is higher than the financial accumulation value obtained by preserving or selling the power.

[0055] As such, the emergency battery-based LED display power control system (1000) of the present invention preemptively connects a backup power path in parallel as soon as the commercial voltage deviates from the normal range, thereby fundamentally preventing a blackout of the display caused by a momentary power interruption, and by cutting off the existing power when a set time elapses, it is possible to stably operate the LED display (300) even when there is a problem with the operation of the commercial power. In addition, even while the commercial power is operating, the replacement time of the emergency battery is determined by measuring the impedance of the emergency battery, and a component protection mode is activated to reduce brightness when the remaining lifespan of the component diagnosed through high-frequency ripple analysis of the output voltage is below a limit, thereby slowing down the degradation rate of the component and physically delaying the time of failure, which can improve the hardware reliability of the system of the present invention. Furthermore, when the commercial power is cut off, real-time advertising revenue, emergency battery reverse power transmission revenue, and power cost savings in the component protection mode are compared from a profit and loss perspective, and based on this, separate value-added revenue can be generated by selling the battery power of the display even in situations where display operation is impossible.

[0056] The embodiments described above are for illustrative purposes only, and those skilled in the art will understand that the embodiments described above can be easily modified into other specific forms without altering the technical concept or essential features of the embodiments described above. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0057] The scope of protection sought through this specification is defined by the claims set forth below rather than by the detailed description, and should be interpreted to include all modifications or variations derived from the meaning and scope of the claims and the concept of equivalents. Explanation of the symbols

[0058] 1000: LED display power control system 103: Output voltage measurement unit 101: AC Power Supply Unit 104: Emergency Battery Unit 102: Dual power drive unit 105: Power path control unit

Claims

Claim 1 An emergency battery-based LED display power control system for supplying power to an LED display composed of multiple color LED elements, comprising: a dual power driving unit that receives AC from an AC power supply unit, converts it into DC, and provides a first power path with a DC voltage range of 2.8 to 3.3 V and a second power path with a DC voltage range of 3.3 to 3.8 V; an output voltage measuring unit that measures the output status of a first DC voltage output from the first power path and a second DC voltage output from the second power path; and an emergency battery unit that provides a backup power path through a battery provided when an abnormality occurs in the voltage output from the dual power driving unit. A power path control unit that, when the output voltage of at least one of the first DC voltage and the second DC voltage deviates from a critical range as a result of measurement by the output voltage measuring unit, blocks the power path of the corresponding DC voltage and activates the backup power path of the emergency battery unit to replace the blocked power path; a reverse current prevention element connected to the downstream end of the first power path, the second power path, and the backup power path, respectively; an impedance measuring unit that, when the first DC voltage or the second DC voltage detected in real time by the output voltage measuring unit is within a corresponding voltage range, periodically applies a test current to the emergency battery unit for a set time to measure the internal impedance of the emergency battery unit in real time; and a system management unit that, when the internal impedance value of the emergency battery unit measured by the impedance measuring unit exceeds a set degradation threshold, generates a battery replacement alarm signal of the emergency battery unit and transmits it to the administrator terminal of the LED display board.The system includes a fault diagnosis unit that, when the first DC voltage or the second DC voltage detected in real time by the output voltage measuring unit is within a corresponding voltage range, receives output data of the corresponding DC voltage, filters ripple components in the high-frequency region from the received output data, and diagnoses fault signs of internal components of the dual power drive unit in real time by comparing the amplitude fluctuations and occurrence frequency of the filtered high-frequency ripple components with previously stored component-specific degradation pattern data. The DC power supplied through the first power path is supplied to a red LED element, and the DC power supplied through the second power path is supplied by connecting it in parallel to a green LED element and a blue LED element. When the first DC voltage or the second DC voltage detected in real time by the output voltage measuring unit rises or falls while deviating from the corresponding voltage range, the power path control unit connects the backup power path of the emergency battery unit in parallel to the power path of the corresponding DC voltage for a set time before cutting off the power path of the corresponding DC voltage, and at this time, the reverse current prevention element provided in the power path of the corresponding DC voltage and the backup power path is conducted in parallel. An emergency battery-based LED display power control system characterized by blocking reverse current caused by a potential difference between different power paths upon connection, and subsequently, when the set time elapses, the power path control unit blocks the power path of the corresponding DC voltage, and the system management unit provides information regarding the power path connected to the LED element constituting the LED display in real time to the manager terminal. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 An emergency battery-based LED display power control system according to claim 1, wherein the fault symptom diagnosis unit calculates the remaining lifespan of the components of the DC voltage power path that matches the result of comparing the amplitude fluctuation and occurrence frequency of the filtered high-frequency ripple component with the degradation pattern data for each component, and the power path control unit switches to a component protection mode that reduces the brightness of the color LED component connected to the DC voltage power path to below a set reference value when the calculated remaining lifespan is less than a set period, and subsequently, when the amplitude fluctuation and occurrence frequency of the high-frequency ripple component filtered by the fault symptom diagnosis unit exceeds a critical noise level that causes malfunction of the color LED component, the backup power path of the emergency battery unit is connected to the color LED component, and the existing connected power path is cut off, and the power path control unit reduces the time for which power is applied to the color LED component or reduces the brightness of the color LED component by varying the value of the internal current control register of the color LED component. Claim 6 The emergency battery-based LED display power control system according to claim 5 further comprises: a power analysis unit that calculates the hourly power consumption of the first power path and the second power path when not in the element protection mode, and calculates the hourly power consumption consumed through the color LED element in the element protection mode; and a driving time calculation unit that calculates the driving time of the LED display using the emergency battery based on the remaining capacity data of the emergency battery unit and the hourly power consumption of the first power path and the second power path when not in the element protection mode, wherein the power path control unit compares the remaining lifespan of the elements of the power path in the element protection mode with the driving time calculated by the driving time calculation unit, and if the remaining lifespan is greater than or equal to the driving time or is smaller than the driving time by a difference of less than a set time, the LED display continues to drive in the element protection mode, and if the remaining lifespan is smaller than the driving time by a difference of more than a set time, the first power path and the second power path are cut off and the backup power path of the emergency battery unit is activated. Claim 7 In claim 5, the power analysis unit calculates the hourly power consumption of the first power path and the second power path when the device protection mode is not in effect, and calculates the hourly power consumption consumed through the color LED element in the device protection mode; the power cost reduction calculation unit calculates the power cost reduced by switching to the device protection mode based on the hourly power consumption data of the first power path and the second power path when the device protection mode is not in effect and the hourly power consumption data in the device protection mode; the expected profit comparison unit compares whether the advertising revenue obtainable by driving the LED display based on the remaining capacity data of the emergency battery unit exceeds the sum of the sales revenue obtainable by selling the remaining capacity data of the emergency battery unit and the power cost reduction calculated by the power cost reduction calculation unit; and the reverse transmission control unit controls the transmission of the power from the remaining capacity data of the emergency battery unit to an external power grid to sell the corresponding power when the advertising revenue is less than the sum of the sales revenue and the power cost reduction due to the device protection mode at the point when both the first power path and the second power path are cut off, and the power An emergency battery-based LED display power control system characterized in that the path control unit activates the backup power path of the emergency battery unit only when the advertising revenue is greater than or equal to the sum of the sales revenue and the power cost saved due to the component protection mode at the point when both the first power path and the second power path are cut off.

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