Emergency lighting devices

Abstract

The present invention relates to an emergency lighting device (100). To this end, the present invention includes: a microcurrent supply device (110) connected to a constant power source and for confirming that the constant power source is being supplied normally; a power detection circuit (120) for determining whether the constant power source is being supplied normally using a signal supplied through the microcurrent supply device (110); a DC-DC switching circuit (130) connected to the power detection circuit (120) and converting power converted to DC through an AC-DC rectifier circuit to a desired voltage; a battery charging circuit (140) connected to the microcurrent supply device (110) and for charging a battery; a battery (150) connected to the battery charging circuit (140) and serving as a backup power source for supplying power to a light when the constant power source is OFF (a power outage occurs); and a power supply device (SMPS; Switching Mode Power Supply) (160) connected to the microcurrent supply device (110) and converting AC power into DC power through a switching operation. The present invention, configured as described above, is a circuit structure that enables the power detection circuit to operate normally by adding a microcurrent supply device (e.g., neon switch lamp, resistor of tens to hundreds of kOhms) to an existing switch. It is equipped with a UVLO (Under Voltage Lock Out) circuit that prevents the microcurrent from being completely removed by adding a clipping circuit to the capacitor required for removing residual light by the microcurrent supply device, and ensures that residual light does not occur in the LED lighting even if a small voltage is applied to the SMPS input side due to the added clipping circuit.

Description

Technology Field

[0001] An embodiment of the present invention relates to an emergency lighting device, and more specifically, it enables installation by using a microcurrent supply device to detect a power outage even when following conventional general wiring, thereby significantly improving the quality and reliability of the emergency lighting device and creating a positive image. Background Technology

[0003] Unless otherwise indicated in this specification, the contents described in this identification item are not prior art for the claims of this application, and are not recognized as prior art simply because they are described in this identification item.

[0004] As is well known, emergency lights are lights that switch to battery power when the standard lighting power system fails, and are used to guide people to safely evacuate in emergencies in places such as homes, commercial buildings, ships, and theaters.

[0005] The main functions of the above emergency lighting device are as follows.

[0006] The primary function of an emergency lighting device is to provide lighting using its own backup power source (usually a battery) in emergency situations, such as power outages.

[0007] First, securing and guiding safe evacuation routes: Brightly illuminate evacuation paths such as hallways, stairwells, exits, and danger zones to help people safely exit the building.

[0008] Second, reduction of panic and confusion: Sudden darkness can cause panic. Emergency lighting maintains a minimum level of illumination, helping people to calmly assess the situation and move.

[0009] Third, safety equipment location indication: Lighting is provided to identify the locations of safety equipment such as fire extinguishers, first aid kits, fire alarms, and evacuation facilities.

[0010] Fourth, support for rescue activities: Provides lighting so that emergency rescue workers can efficiently carry out search and rescue activities inside the building.

[0011] Fifth, compliance with regulations: Building codes and safety regulations in most countries and regions mandate the installation and maintenance of emergency lighting in certain buildings.

[0012] Emergency lighting devices designed to prepare for power outages caused by the aforementioned disasters and emergencies play a key role in facilitating the safe evacuation of people and reducing chaos, but this system also has several issues in terms of functionality and operation.

[0013] In other words, the general problems of the above emergency lighting device are as follows.

[0014] Regular maintenance is essential for the aforementioned emergency lighting system, otherwise there are several problems that may cause malfunctions in emergency situations.

[0015] 1. Insufficient maintenance and testing

[0016] Neglect of Regular Testing and Inspection: Regular functional testing is essential for emergency lights, but it is common for them to fail to work when needed due to this neglect (e.g., light activation test, battery life test).

[0017] Aging of fixtures and parts: The lighting fixtures themselves, wiring, control devices, etc., may malfunction or break down due to age.

[0018] 2. Installation and Deployment Issues

[0019] Inadequate illumination: The installed lighting may not provide the minimum required illumination or may cause shadows or glare in specific areas, thereby hindering evacuation.

[0020] Unclear evacuation route markings: Exit signs may be obscured or installed in locations that do not clearly indicate the evacuation direction, potentially exacerbating confusion.

[0021] 3. Other issues

[0022] Issues with connection to emergency power systems: When using emergency generators or a central emergency power system, switching and connection with these systems may not be smooth.

[0023] Environmental factors: Environmental factors such as high temperature or humidity can degrade the performance of batteries or electronic components.

[0024] Therefore, although the aforementioned emergency lighting device is a lifeline for safe evacuation, only continuous and thorough maintenance and regular testing can guarantee the reliability of the system in emergency situations.

[0025] Meanwhile, Figure 1 is a diagram showing the lighting wiring configuration of a generally widely used structure. The lighting is mounted on the ceiling, and the switch controlling the lighting is located on the wall to turn the power on and off. The L wire of the input power is supplied to the wall switch, and by switching this wire, current flows through the N wire already connected to the lighting to turn the light on or to disconnect the circuit to turn it off. In other words, the light is controlled by opening and closing only one input signal wire. That is, the N wire of the main power is always connected to the lighting, and the L part of the main power is connected to one of the lighting wires at the wall switch. Most existing buildings have lighting structures like the one described above.

[0026] On the other hand, when installing emergency lights to prepare for power outages caused by disasters or emergencies, they are generally connected to an emergency power source to turn on the lights; examples of such cases are as follows.

[0027] In the case of Fig. 2, the lighting is turned on and off by receiving power from the normal power supply, but if an emergency situation occurs and the normal power supply is cut off and the emergency power supply is provided, the relay is switched by the emergency power supply, and the output side (lighting) is switched to the emergency power supply to receive power. In this case, sufficient capacity must be provided for the emergency power supply, and if the emergency power supply unit does not operate properly due to any factor, the lighting cannot operate.

[0028] In addition, Figure 3 shows a case where a battery is built into the lighting. Unlike a general lighting wiring structure, the L line is inserted together with the N line on the lighting side, and the L line is used as a signal for the emergency line. This is a method of detecting that the common line and the emergency line are not connected when the input constant power is not operating, and then driving the built-in battery to turn on the lighting.

[0029] And Fig. 4 shows the internal structure of the battery-powered emergency light described in Fig. 3, which incorporates a power monitoring circuit to determine whether power is being supplied normally, and if power is not supplied, it determines that there is a power outage and operates the battery-powered emergency SMPS to drive the LED module (lighting) unit.

[0030] In order to have the structure shown in Figures 3 and 4 above, phase power must always be supplied to the SMPS section of the lighting and the emergency line. That is, if only one part (N) of the phase power is wired to the lighting section as in Figure 1 (most wiring configurations), an emergency light cannot be installed. In other words, for existing wired lighting, an emergency light having the structure shown in Figures 3 and 4 cannot be installed unless the internal wiring is changed.

[0031] On the other hand, Fig. 5 describes a method to overcome the disadvantage that conventional wiring cannot monitor a power outage, thereby enabling monitoring of whether phase power is being supplied even when the switch is turned off. This method involves using a switch that allows a minute current to flow even when the switch is off. Among the switches available on the market, there are neon switches that emit a faint light when turned off, which can be utilized to monitor a power outage. By utilizing this, emergency lights can be applied to lighting devices with conventional wiring. However, since LED lighting exhibits a residual phenomenon where light is emitted even by minute currents, causing inconvenience, neon switches have become increasingly difficult to find in the general market. Furthermore, to prevent this residual phenomenon, it is common practice to connect a capacitor in parallel to the input terminal of the lighting to block the minute current from affecting the lighting.

[0032] In addition, Figure 6 shows that a capacitor (C) is installed at the input terminal of a general SMPS for LED lighting to eliminate switching noise and input microcurrents of the SMPS. However, due to this capacitor, the input impedance of the emergency light is lowered and the residual light is eliminated, but microcurrents for determining the presence or absence of normal power are also eliminated, so the power monitoring circuit for the emergency light to operate normally cannot operate.

[0033] In conclusion, the aforementioned conventional technology had a problem in that the emergency lighting did not operate when a problem or abnormal phenomenon occurred in the emergency power supply.

[0034] In addition, the aforementioned conventional technology presented a major problem in that it was difficult to install emergency lighting devices when following existing general wiring.

[0036] In order to solve the aforementioned problems, the following prior art documents were developed in the past; however, a major problem still arose in that the problems of the aforementioned prior art could not be solved all at once. Prior art literature

[0038] Korean Patent Publication No. 2020-0098988 (Aug. 21, 2020) has been disclosed. Korean Patent Publication No. 2018-0114327 (October 18, 2018) has been disclosed. Korean Patent Publication No. 2006-0028303 (March 29, 2006) has been disclosed. Korean Patent Publication No. 2006-0019394 (March 3, 2006) has been disclosed. The problem to be solved

[0039] The present invention has been devised to resolve the various problems of the prior art described above. Its first objective is to equip an emergency lighting device with a microcurrent supply unit, a power detection circuit, a DC-DC switching circuit, a battery charging circuit, a Switching Mode Power Supply (SMPS), an input voltage clipping circuit, and an Under Voltage Lock Out (UVLO) circuit. The second objective of the present invention, based on the technical configuration described above, is to enable installation by allowing the detection of a power outage using the microcurrent supply unit even when following existing general wiring. The third objective is a circuit structure in which the power detection circuit can operate normally by adding a microcurrent supply unit (e.g., a neon switch lamp, a resistor of tens to hundreds of kOhms) to an existing switch. Furthermore, a clipping circuit is added to the capacitor required for extinguishing residual light by the microcurrent supply unit to prevent the microcurrent from being completely eliminated, and even if a slight voltage is applied to the SMPS input side due to the added clipping circuit... The fourth objective is to provide a UVLO (Under Voltage Lock Out) circuit that prevents residual light from forming in the LED lighting, and the input voltage clipping circuit applied in this invention is a circuit that prevents the input signal from dropping below Vz by additionally connecting a TVS diode in series with a capacitor for residual light removal at the input terminal of the SMPS, so that when the switch is On, the AC input power is supplied as is, and when the switch is Off, the clipping circuit prevents the output voltage from falling below Vz, thereby enabling the power detection circuit to operate normally by means of a microcurrent circuit connected in parallel with the switch, and the fifth objective is the low voltage operation cutoff circuit (UVLO;Under Voltage Lock Out is a circuit structure applied to the SMPS driver IC. If one wishes to increase the UVLO value, a Zener diode is added to the input bias circuit supplying the SMPS IC to prevent the SMPS from operating when the input voltage is lower than Vz, thereby preventing residual light from forming when low voltage is applied to the SMPS. The sixth objective is to provide an emergency lighting device that can create a positive image by significantly improving the quality and reliability of the emergency lighting device through this. means of solving the problem

[0041] To achieve this objective, the present invention relates to an emergency lighting device and provides an emergency lighting device characterized by comprising: a microcurrent supply device connected to a normal power supply and for confirming that the normal power supply is being supplied normally; a power detection circuit that determines whether the normal power supply is being supplied normally using a signal supplied through the microcurrent supply device; a DC-DC switching circuit connected to the power detection circuit and converting power converted to DC through an AC-DC rectifier circuit to a desired voltage; a battery charging circuit connected to the microcurrent supply device and for charging a battery; a battery connected to the battery charging circuit and serving as a backup power source for supplying power to the lighting when the normal power supply is OFF (in case of a power outage); and a power supply unit (SMPS; Switching Mode Power Supply) connected to the microcurrent supply device and converting AC power into DC power through switching operation. Effects of the invention

[0043] As described in detail above, the present invention enables installation by using a microcurrent supply device to check for a power outage even when following conventional general wiring.

[0044] In addition, the present invention is a circuit structure that enables the power detection circuit to operate normally by adding a microcurrent supply device (e.g., neon switch lamp, resistor of tens to hundreds of kOhms) to an existing switch, and is equipped with a UVLO (Under Voltage Lock Out) circuit that prevents the microcurrent from being completely removed by adding a clipping circuit to the capacitor required for removing residual light by the microcurrent supply device, and prevents residual light from occurring in the LED lighting even if a small voltage is applied to the SMPS input side due to the added clipping circuit.

[0045] Furthermore, the input voltage clipping circuit of the present invention is a circuit that prevents the input signal from dropping below Vz by additionally connecting a TVS diode in series with a capacitor for residual light elimination at the input terminal of the SMPS. When the switch is On, the AC input power is supplied as is, and when the switch is Off, the clipping circuit prevents the output voltage from falling below Vz, thereby enabling the power detection circuit to operate normally through a microcurrent circuit connected in parallel with the switch.

[0046] In addition, the Under Voltage Lock Out (UVLO) circuit applied in this invention is a circuit structure applied to the SMPS driver IC. If one wishes to increase the UVLO value, a Zener diode is added to the input bias circuit supplied to the SMPS IC to prevent the SMPS from operating when the input voltage is lower than Vz, thereby preventing residual light from forming when low voltage is applied to the SMPS.

[0047] This invention is a very useful invention that can create a positive image by significantly improving the quality and reliability of emergency lighting devices.

[0049] Hereinafter, a preferred embodiment of the present invention for achieving these effects will be described in detail with reference to the attached drawings. Brief explanation of the drawing

[0051] Figure 1 is a wiring diagram of a typical lighting system. FIG. 2 shows a case where there is a conventional emergency power supply and sufficient power is supplied. Wiring structure diagram. Figure 3 is a diagram of the emergency light structure when using a conventional battery. Figure 4 is a structural diagram of a conventional battery-embedded LED emergency light. FIG. 5 is a wiring structure diagram of an emergency light for operating a conventional power monitoring circuit. FIG. 6 is a structural diagram of a case where there is a residual light removal circuit (C) in a conventional LED lighting. FIG. 7 is a block diagram of an emergency lighting device applied to the present invention. FIG. 8 is an input voltage clipping circuit diagram applied to the present invention. FIG. 9 is an Under Voltage Lock (UVLO) circuit diagram applied to the present invention. Out) FIG. 10 is a flowchart of an emergency lighting device applied to the present invention. Specific details for implementing the invention

[0052] The emergency lighting device applied in the present invention is configured as shown in FIGS. 7 to 10.

[0053] In the following description of the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the essence of the present invention, such detailed description will be omitted.

[0054] Furthermore, the terms described below are established considering their functions in the present invention, and since these may vary depending on the producer's intent or practice, their definitions should be based on the content throughout this specification.

[0055] In addition, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, so the present invention is not necessarily limited to what is shown in the drawings.

[0056] First, the present invention relates to an emergency lighting device (100) and is configured as follows.

[0057] That is, the present invention is connected to a constant power source and is equipped with a microcurrent supply device (110) for confirming that the constant power source is being supplied normally.

[0058] At this time, it is preferable that the microcurrent supply device (110) be equipped with a neon switch lamp that lights up when a microcurrent flows through a built-in lamp when the switch is turned off, thereby indicating the switch position and allowing the power outage state to be monitored by utilizing this.

[0059] In addition, the present invention is provided with a power detection circuit (120) that determines whether the constant power supply is being supplied normally using a signal supplied through the microcurrent supply device (110).

[0060] In addition, the present invention is provided with a DC-DC switching circuit (130) connected to the power detection circuit (120) and converting the power converted to DC through an AC-DC rectifier circuit into a desired voltage.

[0061] In addition, the present invention is provided with a battery charging circuit (140) connected to the microcurrent supply device (110) and for charging a battery.

[0062] In addition, the present invention is provided with a battery (150) which is connected to the battery charging circuit (140) and serves as a backup power source for supplying power to the lighting when the normal power is OFF (when a power outage occurs).

[0063] In addition, the present invention is provided with a power supply unit (SMPS; Switching Mode Power Supply) (160) that is connected to the microcurrent supply unit (110) and converts AC power into DC power through switching operation.

[0064] Meanwhile, the power supply unit (SMPS; Switching Mode Power Supply) (160) applied to the present invention is configured as follows.

[0065] That is, the present invention is provided with an input voltage clipping circuit (161) to cut off power coming from the microcurrent supply device (110) and to allow the switch to operate normally according to ON / OFF.

[0066] In addition, the present invention is provided with an AC-DC rectifier circuit (162) that is connected to the input voltage clipping circuit (161) and converts AC power supplied from a constant power source into DC.

[0067] In addition, the present invention is provided with an under voltage lock-out circuit (UVLO; Under Voltage Lock Out) (163) connected to the AC-DC rectifier circuit (162) and which stops the circuit operation when the input voltage is lower than a predetermined threshold value.

[0068] In addition, the present invention is provided with a DC-DC switching circuit (164) that is connected to the under voltage lockout circuit (UVLO; Under Voltage Lock Out) (163) and converts the power converted to DC through an AC-DC rectifier circuit to a desired voltage.

[0069] In addition, the present invention is provided with an LED Part (165) connected to the DC-DC switching circuit (164) and equipped with an LED.

[0070] In addition, the input voltage clipping circuit (161) applied in the present invention provides an emergency lighting device characterized by additionally connecting a TVS (Transient Voltage Suppressor) diode in series to a capacitor for removing residual light at the input terminal of a power supply (SMPS; Switching Mode Power Supply) (160) so that the input signal does not drop below Vz.

[0071] At this time, when the switch of the input voltage clipping circuit (161) is On, the AC input power is supplied as is, and when the switch is Off, the output voltage is prevented from falling below VZ by the clipping circuit, thereby allowing the power detection circuit to operate normally by the microcurrent circuit connected in parallel with the switch.

[0072] In addition, the under voltage lock-out circuit (UVLO; Under Voltage Lock Out) (163) applied in the present invention is a circuit structure applied to the driving IC of the switching mode power supply (SMPS; Switching Mode Power Supply) (160), and if one wishes to increase the value of the under voltage lock-out circuit (UVLO; Under Voltage Lock Out) (163), a Zener diode is added to the input bias circuit supplied to the driving IC of the switching mode power supply (SMPS; Switching Mode Power Supply) (160) so that when the input voltage is lower than Vz, the switching mode power supply (SMPS; Switching Mode Power Supply) (160) cannot operate, thereby preventing residual light from forming when a low voltage is supplied to the switching mode power supply (SMPS; Switching Mode Power Supply) (160), thereby providing an emergency lighting device.

[0073] Finally, in the present invention, if the input voltage is higher than Vz, it is difficult to remove the noise signal entering the power input, and if the input voltage is lower than Vz, it is not possible to recognize microcurrents, which may cause errors in the operation of the lighting device system.

[0074] At this time, the magnitude of the above Vz is preferably about 5 to 10% of the magnitude of the input power supply. If the input voltage is higher than Vz (approx. 20V based on AC 220V), it is difficult to remove the noise signal of the input power supply, and if the input voltage is lower than Vz (approx. 10V based on AC 220V), it is difficult to recognize microcurrents, which may cause errors in the operation of the lighting device system. Therefore, the magnitude of the above Vz is preferably 5 to 10% of the magnitude of the input power supply.

[0076] Meanwhile, the present invention can be modified in various ways and can take various forms when applying the above-mentioned components.

[0077] And it should be understood that the present invention is not limited to the specific forms mentioned in the above detailed description, but rather should be understood to include all variations, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims.

[0079] The effects of the emergency lighting device of the present invention configured as described above are as follows.

[0080] First, the present invention is a circuit structure that enables the power detection circuit to operate normally by adding a microcurrent supply device (e.g., a neon switch lamp, a resistor of tens to hundreds of kOhms) to an existing switch, and includes a UVLO (Under Voltage Lock Out) circuit that prevents the microcurrent from being completely removed by adding a clipping circuit to the capacitor required for removing residual light by the microcurrent supply device, and prevents residual light from occurring in the LED lighting even if a small voltage is applied to the SMPS input side due to the added clipping circuit.

[0081] To this end, FIG. 7 applied to the present invention shows an overall block diagram of an emergency lighting device (100).

[0082] Also, FIG. 8 shows an input voltage clipping circuit diagram (161) applied to the present invention.

[0083] And FIG. 9 shows the Under Voltage Lock Out (UVLO) circuit diagram (163) applied to the present invention.

[0084] FIG. 10 shows a flowchart of an emergency lighting device (100) applied to the present invention, which will be explained in more detail below as follows.

[0085] The emergency lighting device (100) of the present invention is an emergency light structure that can be applied to existing lighting wiring.

[0086] To this end, the present invention first supplies power to an emergency lighting device (100).

[0087] At this time, when power (normal power) is supplied to the above emergency lighting device (100), the light of the LED Part (165) turns 'ON'.

[0088] In particular, as power is supplied to the above emergency lighting device (100), the power detection circuit (120) detects a microcurrent.

[0089] At this time, when the power detection circuit (120) detects a microcurrent, the emergency lighting device (100) operates normally because power is supplied at all times.

[0090] On the other hand, if the power detection circuit (120) fails to detect a microcurrent, power is not supplied at all, so the lighting of the LED Part (165) is turned 'ON' through the operation of the battery (150) in the next step.

[0091] In the above process, if the power detection circuit (120) fails to detect a microcurrent, it recognizes it as a power outage and supplies power to the lighting of the LED Part (165).

[0092] In particular, the power supply unit (SMPS; Switching Mode Power Supply) (160) applied to the present invention in the above process will operate the following steps.

[0093] That is, the input voltage clipping circuit (161) cuts off the power coming from the microcurrent supply device (110) and allows the switch to operate normally depending on ON / OFF.

[0094] At this time, the input voltage clipping circuit (161) is a circuit that prevents the input signal from dropping below Vz by additionally connecting a TVS diode in series to a capacitor for removing residual light at the input terminal of the SMPS as shown in FIG. 8. When the switch is On, the AC input power is supplied as is, and when the switch is Off, the output voltage is prevented from dropping below Vz by the clipping circuit, thereby allowing the power detection circuit to operate normally by the microcurrent circuit connected in parallel with the switch.

[0095] Afterwards, an AC-DC rectifier circuit (162) connected to an input voltage clipping circuit (161) converts the AC power supplied from the constant power source into DC.

[0096] Next, the under voltage lock-out circuit (UVLO; Under Voltage Lock Out) (163) connected to the AC-DC rectifier circuit (162) stops the circuit operation when the input voltage is lower than a predetermined threshold value.

[0097] At this time, the above-mentioned under voltage lockout circuit (UVLO; Under Voltage Lock Out) (163) is a circuit structure applied to a general SMPS driving IC. However, if you want to increase the UVLO value, a Zener diode is added to the input bias circuit supplied to the SMPS IC as shown in Figure 9 so that the SMPS does not operate when the input voltage is lower than Vz, thereby preventing residual light from forming when a low voltage is applied to the SMPS.

[0098] Subsequently, a DC-DC switching circuit (164) connected to an Under Voltage Lock Out (UVLO) circuit (163) converts the power converted to DC through an AC-DC rectifier circuit to a desired voltage.

[0099] Next, the light of the LED Part (165) connected to the DC-DC switching circuit (164) is turned 'ON'.

[0101] The present invention, as described above, is a circuit structure that enables a power detection circuit to operate normally by adding a microcurrent supply device (e.g., a neon switch lamp, with a resistance of tens to hundreds of kOhms) to an existing switch. It is equipped with a UVLO (Under Voltage Lock Out) circuit that prevents residual light from forming in the LED lighting even if a slight voltage is applied to the input side of the SMPS due to the added clipping circuit, by adding a clipping circuit to the capacitor required for residual light elimination by the microcurrent supply device so that the microcurrent is not completely eliminated. The input voltage clipping circuit applied in the present invention is a circuit that prevents the input signal from dropping below Vz by adding a TVS diode in series to the capacitor for residual light elimination at the input terminal of the SMPS. When the switch is ON, the AC input power is supplied as is, and when the switch is OFF, the output voltage is prevented from falling below Vz by the clipping circuit, thereby allowing the power detection circuit to operate normally through the microcurrent circuit connected in parallel with the switch. It enables operation, and the Under Voltage Lock Out (UVLO) circuit applied in this invention is a circuit structure applied to the SMPS driving IC. If one wishes to increase the UVLO value, a Zener diode is added to the input bias circuit supplied to the SMPS IC to prevent the SMPS from operating when the input voltage is lower than Vz, thereby providing the effect of preventing residual light from forming when low voltage is supplied to the SMPS. Industrial applicability

[0103] The technical concept of the emergency lighting device of the present invention is such that the same results can be repeatedly achieved in practice, and in particular, by implementing such an invention, it can promote technological advancement and contribute to industrial development, thus having sufficient value for protection.

[0104] No content Explanation of the symbols

[0105] <Explanation of symbols for major parts of the drawing> 100: Emergency lighting device 110: Microcurrent supply device 120: Power detection circuit 130: DC-DC switching circuit 140: Battery charging circuit 160: Power supply (SMPS; Switching Mode Power Supply) 161: Input voltage clipping circuit 163: Under Voltage Lock Out (UVLO)

Claims

Claim 1 The invention relates to an emergency lighting device (100), comprising: a microcurrent supply device (110) connected to a normal power supply and for confirming that the normal power supply is being supplied normally; a power detection circuit (120) for determining whether the normal power supply is being supplied normally using a signal supplied through the microcurrent supply device (110); a DC-DC switching circuit (130) connected to the power detection circuit (120) and for converting power converted to DC through an AC-DC rectifier circuit to a desired voltage; a battery charging circuit (140) connected to the microcurrent supply device (110) and for charging a battery; and a battery (150) connected to the battery charging circuit (140) and serving as a backup power source for supplying power to the lighting when the normal power supply is OFF (when a power outage occurs). A power supply unit (SMPS; Switching Mode Power Supply) (160) connected to a microcurrent supply unit (110) and converting AC power into DC power through switching operation; wherein the power supply unit (SMPS; Switching Mode Power Supply) (160) includes: an input voltage clipping circuit (161) for cutting off power coming from the microcurrent supply unit (110) and allowing normal operation according to the ON / OFF switch; an AC-DC rectifier circuit (162) connected to the input voltage clipping circuit (161) and converting AC power supplied from a constant power source into DC; and an under voltage lock-out circuit (UVLO; Under Voltage Lock Out) (163) connected to the AC-DC rectifier circuit (162) and stopping circuit operation when the input voltage is lower than a predetermined threshold value. An emergency lighting device characterized by including: a DC-DC switching circuit (164) connected to an Under Voltage Lock Out (UVLO) circuit (163) and converting power converted to DC through an AC-DC rectifier circuit to a desired voltage; and an LED Part (165) connected to the DC-DC switching circuit (164) and equipped with an LED. Claim 2 An emergency lighting device according to claim 1, wherein the input voltage clipping circuit (161) is configured such that when the switch of the input voltage clipping circuit (161) is On, the AC input power is supplied as is, and when the switch is Off, the output voltage is prevented from falling below VZ by the clipping circuit, thereby allowing the power detection circuit to operate normally by a microcurrent circuit connected in parallel with the switch. Claim 3 An emergency lighting device according to claim 1, wherein the input voltage clipping circuit (161) is characterized by additionally connecting a TVS (Transient Voltage Suppressor) diode in series to a capacitor for removing residual light at the input terminal of a power supply (SMPS; Switching Mode Power Supply) (160) so that the input signal does not drop below Vz. Claim 4 An emergency lighting device according to claim 1, wherein the under voltage lock-out circuit (UVLO; Under Voltage Lock Out) (163) is a circuit structure applied to the driving IC of the switching mode power supply (SMPS; Switching Mode Power Supply) (160), and if the value of the under voltage lock-out circuit (UVLO; Under Voltage Lock Out) (163) is to be increased, a Zener diode is added to the input bias circuit supplied to the driving IC of the switching mode power supply (SMPS; Switching Mode Power Supply) (160) so that when the input voltage is lower than Vz, the switching mode power supply (SMPS; Switching Mode Power Supply) (160) cannot operate, thereby preventing residual light from forming when a low voltage is supplied to the switching mode power supply (SMPS; Switching Mode Power Supply) (160). Claim 5 delete

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