LED lamp emergency power supply and use method thereof

Abstract

The invention relates to the technical field of emergency power supplies, in particular to an LED lamp emergency power supply and a use method thereof.The LED lamp emergency power supply comprises a power supply input unit used for receiving an alternating current or direct current power supply within a preset voltage range; the control unit is used for controlling the output of the emergency power supply when the power supply is abnormal; the emergency power supply output unit is used for providing an emergency power supply for the LED lamp; the charging unit is used for charging the internal battery when the power supply is normal; and the self-checking unit comprises a plurality of control modes and is used for detecting the state of the emergency power supply. The power supply input unit is matched with the control unit, the emergency power supply output unit, the charging unit and the self-checking unit, a 48-pin MCU is used as a control core, a constant power output mode is added, a switching power supply type LED drive can be connected, and a wiring drive or direct parallel connection with a drive output can also be realized; a user can automatically adjust an output mode by connecting the RJ11 port with an upper computer according to requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of emergency power supplies, and in particular to an emergency power supply for an LED lamp and a use method thereof. Background Art

[0002] LED lamps are DC light sources. Conventional LED lamps have external driving power supplies (constant current sources). When the mains is turned on, AC is input and DC is output to start the LED light source for lighting. Therefore, conventional LED lamps do not have the function of emergency lighting. At present, both the international and domestic markets pay more and more attention to emergency lighting related to security. In particular, public places need to install a certain proportion of emergency lighting lamps with the function of continuous lighting for several hours after a power outage. Therefore, LED emergency power supplies come into play.

[0003] The current emergency power supplies for LED lamps are as follows: They can be divided into two categories based on the way the LED finally obtains emergency power supply in an emergency state. 1. In an emergency state, the output voltage (DC or AC) of the emergency power supply is connected to the input power supply of the driver, and the driver continues to light up the LED; 2. In an emergency state, the output of the emergency power supply is directly connected to the LED power supply end, and the emergency power supply directly lights up the LED. Emergency power supplies have the requirement of self-test function. Common control methods of the self-test function are: 1. Press the self-test button; 2. Remote control infrared control; 3. Bluetooth control; 4. DALI control. Among them, the first two control methods are currently popular methods, and the latter two are rarely used.

[0004] In the prior art, under emergency conditions, the output voltage mode of the emergency power supply can mostly only be connected to a switching power supply type LED driver, which is not convenient for adjusting the output mode according to demand; in addition, among the four control methods of the self-test function mentioned above, the first two methods are existing technologies and meet common needs, but the latter two more convenient and intelligent methods are currently not compatible with emergency power supplies. Summary of the invention

[0005] Some simplifications or omissions may be made in this section and the abstract and title of the present application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0006] In order to solve the deficiencies of the prior art, an object of the present invention is to provide an emergency power supply for an LED lamp. In order to achieve the above objectives, the present invention adopts the following technical solution: an emergency power supply for LED lamps, comprising: A power input unit, used to receive an AC or DC power supply within a predetermined voltage range; A control unit, used to control the output of the emergency power supply when the power supply is abnormal; Emergency power output unit, used to provide emergency power to LED lamps; a charging unit for charging an internal battery when the power supply is normal; and, The self-checking unit includes multiple control modes and is used to check the status of the emergency power supply.

[0007] As a preferred solution of the LED lamp emergency power supply of the present invention, the control unit is a microcontroller based on a 48-pin MCU, which includes: a voltage detection module, used to detect the input voltage and determine the input voltage range; and, A power control module is used to control the output voltage and current of the emergency power supply according to the input voltage range and load demand.

[0008] As a preferred solution of the emergency power supply for LED lamps of the present invention, wherein: the power supply voltage range received by the power input unit is AC120-347V; The control unit communicates with external devices through a programming interface, which includes USB and RJ11 ports.

[0009] As a preferred solution of the LED lamp emergency power supply of the present invention, wherein: the emergency power supply output unit includes at least one of a constant voltage output mode and a constant power output mode; Among them, the output voltage of the constant voltage output mode is DC20-400V, and the constant power output mode supports constant power of load voltage 20-400V.

[0010] As a preferred solution of the emergency power supply for LED lamps of the present invention, the power input unit further comprises a lithium battery for storing emergency power, and a battery connected to the emergency power output unit. A switching power supply circuit, used to convert the mains electricity into a charging voltage for the lithium battery; Battery protection circuit, used to prevent lithium battery from overcharging and over-discharging; An on-off circuit for controlling the transmission of lithium battery voltage; and, The detection circuit in the self-test unit is used to detect the state of the switch of the LED lamp and output a control signal to the on-off circuit.

[0011] As a preferred solution of the emergency power supply for LED lamps described in the present invention, the self-test unit includes at least one control method selected from buttons, infrared, Bluetooth and DALI, and the detection circuit is respectively connected to at least one of the buttons, infrared, Bluetooth and DALI.

[0012] As a preferred solution of the emergency power supply for LED lamps of the present invention, the switching power supply circuit includes: a rectifier circuit for rectifying alternating current into direct current; and, The transformer is used to step down the DC power output by the rectifier circuit and charge the lithium battery.

[0013] As a preferred solution of the emergency power supply for LED lamps of the present invention, wherein: the on-off circuit is a relay circuit, and the relay circuit generates an action according to the detection signal of the detection circuit; The detection circuit includes a feedback circuit for feedback control of the power output of the lithium battery, and the feedback circuit is a photoelectric coupler.

[0014] As a preferred solution of the emergency power supply for LED lamps of the present invention, the switching power supply circuit further comprises a boost circuit for boosting the voltage of the lithium battery to a voltage suitable for LED lamp lighting.

[0015] The LED lamp emergency power supply of the present invention has beneficial effects: the present invention cooperates with the power input unit and the control unit, the emergency power output unit, the charging unit and the self-test unit, and uses a 48-pin MCU as the control core to add a constant power output mode. It can not only connect to a switching power supply type LED drive, but also can be linearly driven or directly connected in parallel with the drive output. Users can adjust the output mode by connecting to the host computer through the RJ11 port according to needs.

[0016] In order to solve the deficiencies of the prior art, another object of the present invention is to provide a method for using an emergency power supply for an LED lamp. In order to achieve the above objectives, the present invention adopts the following technical solution: a method for using an emergency power supply for an LED lamp, comprising the following steps: When the mains power fails abnormally, it will automatically switch to emergency power output; After the mains power returns to normal, the emergency function will be automatically exited and the mains power will be used for power supply; The on-off of the on-off circuit is controlled by the detection circuit, so as to realize the on-off control of the emergency lighting by the switch of the LED lamp itself; The battery protection circuit prevents the lithium battery from overcharging and over-discharging.

[0017] The beneficial effects of the method for using an emergency power supply for an LED lamp of the present invention are the same as those of an emergency power supply for an LED lamp, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the emergency power supply of the LED lamp of the present invention.

[0020] Figure 2 The figure is a schematic diagram of the structure of the emergency power switch power circuit of the LED lamp of the present invention.

[0021] Figure 3 The figure is a schematic diagram of the circuit structure of the control unit of the emergency power supply of the LED lamp of the present invention.

[0022] Figure 4 It is a schematic diagram of the principle of the constant voltage output mode of the present invention.

[0023] Figure 5 It is a schematic diagram of the principle of the constant power output mode of the present invention.

[0024] In the figure: 100, power input unit; 101, lithium battery; 102, switching power supply circuit; 102a, rectifier circuit; 102b, boost circuit; 103, battery protection circuit; 104, on-off circuit; 200, control unit; 201, voltage detection module; 202, power control module; 300, emergency power output unit; 301, constant voltage output mode; 302, constant power output mode; 400, charging unit; 500, self-test unit; 501, detection circuit; 501a, feedback circuit; 502, button; 503, infrared; 504, Bluetooth; 505, DALI. DETAILED DESCRIPTION

[0025] In order to make the objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0028] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] Example 1 Reference Figure 1-Figure 5 , which is the first embodiment of the present invention, provides an emergency power supply for LED lamps, which is used to solve the problem that the existing emergency power supply for LED lamps has a single power supply mode in an emergency state and cannot meet the emergency power supply requirements of different types of LED drivers. It includes: a power input unit 100, a control unit 200, an emergency power output unit 300, a charging unit 400 and a self-test unit 500. The power input unit 100 is provided to receive an AC or DC power supply within a predetermined voltage range, the control unit 200 is provided to control the output of the emergency power supply when the power supply is abnormal, the emergency power output unit 300 is provided to provide emergency power to the LED lamp, the charging unit 400 is provided to charge the internal battery when the power supply is normal, and the self-test unit 500 including multiple control modes is provided to detect the state of the emergency power supply.

[0030] Specifically, the control unit 200 is a microcontroller based on a 48-pin MCU, which includes a voltage detection module 201 for detecting input voltage and determining the input voltage range; and a power control module 202 for controlling the output voltage and current of the emergency power supply according to the input voltage range and load requirements. A microcontroller based on a 48-pin MCU refers to an electronic device or system that uses a microcontroller unit (MCU) with 48 pins as its core processing unit. MCU, or microcontroller unit, is an integrated circuit chip that combines the core functions of a computer - including a central processing unit (CPU), memory (RAM and ROM), input / output interface (I / O) and sometimes peripherals (such as timers and analog-to-digital converters) - on a single chip. "48 pins" refers to the number of pins on the MCU chip, which are used to physically connect and communicate with other electronic components (such as resistors, capacitors, diodes, transistors, etc.) or external devices (such as sensors, displays, motors, etc.). These pins can be configured to different functions, such as power, ground, input, output, analog input and output, communication interface (such as I2C, SPI, UART, etc.). The characteristics of microcontrollers based on 48-pin MCU are: high integration: integrating multiple functions on one chip, reducing the need for external components, saving space and cost; strong flexibility: pins can be flexibly configured to meet different application requirements; strong programmability: complex control logic and functions can be implemented through programming; low power consumption: suitable for battery-powered or power-demanding applications; and reliability: multiple functions integrated on one chip reduce external connections and improve system reliability.

[0031] Furthermore, the power input unit 100 receives a power voltage in the range of AC120-347V; the control unit 200 communicates with external devices via a programming interface, which includes USB and RJ11 ports. The USB (Universal Serial Bus) port is a widely used interface technology for connecting computers to external devices. The main features of the USB port include: plug and play: support for hot plugging, that is, connecting or disconnecting devices without restarting the computer; and compatibility with multiple devices. The RJ11 port is a telephone line interface, mainly used to connect telephone devices and computer modems. The main features of the RJ11 port include: telephone line connection: used to connect telephone lines for voice communication or data transmission; and the number of its pins: usually 4 or 6 pins, while the RJ45 (Ethernet port) has 8 pins.

[0032] Preferably, the emergency power supply output unit 300 includes at least one of a constant voltage output mode 301 and a constant power output mode 302; wherein the output voltage of the constant voltage output mode 301 is DC20-400V, and the constant power output mode 302 supports a load voltage of 20-400V constant power. This solution supports AC120-347 input, and in case of emergency, there are two output modes: constant voltage output mode 301 and constant power output mode 302. The two modes are selected and switched by the host computer through the USB+RJ11 data line programming port.

[0033] Working principle: Constant voltage output mode 301, constant voltage output DC170-400V, the load is a conventional AC or DC input driver with 0-10V dimming function, and the MCU determines whether the input voltage is AC120V or AC220V and above based on the input voltage range detection pin.

[0034] If it is judged to be AC120V input, the MCU controls the output voltage to output DC170V by controlling the output voltage control pin, and then calculates the output power through the signals sampled by the emergency output voltage acquisition and output current acquisition pins, and controls the output power of the driver by adjusting the dimming voltage of the emergency dimming part and controlling the dimming voltage of the driver, so that the emergency output power is the design value; If the MCU determines that the input voltage range is AC220V and above, it controls the output voltage to output DC360V, and the output power control method is the same as above.

[0035] Constant power output mode 302, constant power output, the load is LED lamp or linear input LED lamp, support load voltage 20-400V constant power. At this time, the emergency output voltage is determined by the load, and the MCU will gradually increase the current of the emergency power supply output until the output power reaches the design value.

[0036] Example 2 Reference Figure 1-Figure 5 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a lithium battery 101 for storing emergency power, a switching power circuit 102, a battery protection circuit 103, an on-off circuit 104 and a detection circuit 501 arranged in a self-test unit 500, which solves the problem that the existing self-test function control method is limited, not convenient and intelligent enough, and cannot meet the diverse user needs.

[0037] Specifically, the power input unit 100 also includes a lithium battery 101 for storing emergency power, and a switching power circuit 102 connected to the emergency power output unit 300, for converting the AC power into a charging voltage for the lithium battery 101; a battery protection circuit 103, for preventing the lithium battery 101 from being overcharged and over-discharged; an on-off circuit 104, for controlling the transmission of the voltage of the lithium battery 101; and a detection circuit 501 provided in the self-test unit 500, for detecting the state of the switch of the LED lamp and outputting a control signal to the on-off circuit 104.

[0038] Furthermore, the self-check unit 500 includes at least one control mode selected from the group consisting of a button 502, infrared 503, Bluetooth 504 and DALI 505, and the detection circuit 501 is respectively connected to at least one of the button 502, infrared 503, Bluetooth 504 and DALI 505. The self-check function of the emergency power supply is to ensure that it can work reliably when actually needed. The four self-check function control modes and their implementation methods are: The implementation method of pressing the self-test button: a physical button is set on the housing or control panel of the emergency power supply, and the user can start the self-test program by directly pressing this button. The button is connected to an input pin of the microcontroller (MCU). When the button is pressed, the MCU detects the signal change and executes the self-test program; Advantages: simple and intuitive operation, no additional equipment required; Disadvantages: physical contact is required, not suitable for remote control.

[0039] Implementation method of infrared control by remote controller: Use infrared remote controller to send specific self-test instructions to the emergency power supply. The emergency power supply is equipped with an infrared receiver to receive infrared signals from the remote controller and pass them to the MCU after decoding. The MCU executes the self-test program according to the received instructions; Advantages: Wireless control can be realized, easy to operate; Disadvantages: The control distance is limited and may be interfered by obstacles.

[0040] Implementation method of Bluetooth control: The emergency power supply has a built-in Bluetooth module, which can receive self-test instructions from smartphones or other Bluetooth devices by pairing with them. Users can run a dedicated application on the paired device and send self-test commands through the application; its advantages: remote control can be achieved, and the communication distance is farther than infrared; its disadvantages: additional Bluetooth modules and power consumption are required, and the configuration is relatively complex.

[0041] DALI control implementation method: DALI (Digital Addressable Lighting Interface) is a communication protocol for lighting control. The emergency power supply is connected to the DALI bus and sends self-test instructions through the DALI controller. The DALI controller can be a separate device or integrated into a building management system; its advantages: suitable for large lighting systems, can achieve centralized control and monitoring; its disadvantages: requires DALI-compatible equipment and wiring, and the cost is relatively high.

[0042] Each control method has its specific application scenarios and advantages and disadvantages. In actual applications, the appropriate self-checking control method may be selected based on cost, convenience, system complexity, and specific needs of users. Some systems may integrate multiple control methods to provide more flexibility and choices.

[0043] Among them, the switching power supply circuit 102 includes: a rectifier circuit 102a, which is used to rectify the alternating current into direct current; and a transformer, which is used to step down the direct current output by the rectifier circuit 102a and charge the lithium battery 101. The rectifier circuit 102a is a circuit that converts alternating current (AC) into direct current (DC). In power electronics, rectification is an important process of power conversion and is widely used in power supply, power transmission, and energy storage. The basic function of the rectifier circuit 102a is to utilize the unidirectional conductivity of semiconductor devices (such as diodes) to allow current to flow in only one direction, thereby converting the periodic waveform of alternating current into a pulsating DC waveform in a single direction. In this embodiment, the rectifier circuit 102a adopts a full-wave rectifier circuit, which uses the positive and negative half cycles of alternating current for rectification. Through the center-tapped transformer, both half cycles of alternating current are converted into DC pulsating waveforms in the same direction, and the output waveform is relatively smooth.

[0044] Furthermore, the on-off circuit 104 is a relay circuit, which operates according to the detection signal of the detection circuit 501. After the relay operates, the voltage of the lithium battery 101 is transmitted to the boost circuit 102b through the relay. The boost circuit 102b is used to boost the voltage of the lithium battery 101 so that the boosted voltage reaches the voltage used for LED lighting.

[0045] The detection circuit 501 includes a feedback circuit 501a for feedback control of the power output of the lithium battery 101, and the feedback circuit 501a is a photocoupler. The on-off circuit 104 refers to a circuit that can control the flow or disconnection of current. It plays an important role in electronic and electrical systems and is used to turn on or off the flow of current. This circuit usually includes one or more switching elements, which can be mechanical switches, relays, transistors, MOSFETs (metal-oxide-semiconductor field-effect transistors) or other types of semiconductor devices. In this embodiment, the type of the on-off circuit 104 is an electronic on-off circuit, which uses the electronic element MOSFET to control the on and off of the current.

[0046] Feedback circuit 501a is an electronic circuit that feeds back a portion of the energy (voltage, current or power) output by the system to the input of the system and compares it with the input signal to adjust the response of the system. Feedback circuits 501a are very important in electronic systems because they can be used to stabilize output, improve gain accuracy, reduce noise and interference, and implement various control functions. In this embodiment, feedback circuit 501a adopts a positive feedback type, and its output signal has the same phase as the input signal, which has the effect of enhancing the input signal.

[0047] Preferably, the switching power supply circuit 102 also includes a boost circuit 102b for boosting the voltage of the lithium battery 101 to a voltage suitable for LED lighting. A boost circuit (Boost Converter), also known as a boost converter or a boost circuit, is a DC-DC converter used to boost an input voltage to a higher output voltage. This circuit is very common in applications that require converting a low-voltage power supply to a high-voltage power supply, such as in laptop power adapters, mobile phone chargers, LED lighting drivers, etc. In this embodiment, the boost circuit 102b uses a pulse width modulation (PWM) control method to control the output voltage by changing the on-time (pulse width) of the switching element.

[0048] When the city power is cut off, the lithium battery 101 can discharge to provide power for the LED lamp. The voltage of the lithium battery 101 will first be boosted by the boost circuit 102b, and then pass through the on-off circuit 104. The on-off circuit 104 is used to control the output of the lithium battery 101. At the same time, a detection circuit 501 is provided to control the on-off of the on-off circuit 104. The detection circuit 501 is used to detect the state of the switch of the LED lamp itself. The design of the detection circuit 501 can still control the on and off of the LED lamp through the switch of the LED lamp itself when the power is off.

[0049] The rest of the structure is the same as that of Example 1.

[0050] A method for using an emergency power supply for an LED lamp: when the mains power fails abnormally, the emergency power supply output is automatically switched to; when the mains power is cut off, the power output end outputs the voltage of the lithium battery 101 to the drive circuit, and the drive circuit provides drive power for multiple light sources connected in parallel; after the mains power returns to normal, the emergency function is automatically exited and the mains power is supplied; the on-off of the on-off circuit 104 is controlled by the detection circuit 501, so as to realize the control of the on and off of the emergency lighting by the switch of the LED lamp itself; the lithium battery 101 is prevented from being overcharged and over-discharged by the battery protection circuit 103, and when the lithium battery 101 is fully charged, the charging current is cut off to prevent the lithium battery 101 from being overcharged, and when the power is cut off, the power is supplied to the LED lamp to realize lighting, and the lithium battery 101 can also be prevented from being over-discharged. The lithium battery 101 contains a charging circuit inside, which is used to charge the battery when the mains power is normal. The emergency power supply is connected to the host computer through the USB and RJ11 ports, and can be used to connect the output port of the LED driver or LED lamp.

[0051] Specifically, the power input supports an input voltage range of AC120-347V to adapt to different mains power environments. The emergency power output can connect the output voltage of the emergency power supply to the input power supply of the LED driver in an emergency state, and the driver continues to light up the LED. It includes two output modes: constant voltage output and constant power output.

[0052] Among them, constant voltage output mode: the output voltage range is DC170-400V, which is suitable for conventional AC or DC input drivers with 0-10V dimming function. The MCU determines the input voltage according to the input voltage range detection pin and controls the output voltage and power; constant power output mode: suitable for LED lamps or LED lamps with linear input, supports load voltage 20-400V constant power, the emergency output voltage is determined by the load, and the MCU gradually increases the emergency power supply output current until the output power reaches the design value.

[0053] Furthermore, the self-check function control mode: four self-check modes are integrated: button, infrared, Bluetooth, and DALI control. Users can perform self-checks in these ways to ensure the normal operation of the emergency power supply.

[0054] Furthermore, a host computer programming interface is provided: a USB+RJ11 data line programming port is provided, allowing users to select and switch output modes through the host computer.

[0055] Among them, the switching logic between the AC power supply and the emergency power supply is: when the AC power is abnormally cut off, the LED lamp continues to illuminate at the set power for at least 90 minutes; if the AC power returns to normal, the emergency function will be automatically exited, the LED is still powered by the AC power, and the emergency internal battery is also charged through the internal charging circuit.

[0056] The MCU control logic is: the MCU controls the output voltage and current of the emergency power supply according to the input voltage range and load requirements to achieve constant voltage or constant power output.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An emergency power supply for LED lamps, characterized by: include, A power input unit (100), used for receiving an AC or DC power supply within a predetermined voltage range; A control unit (200) is used to control the output of the emergency power supply when the power supply is abnormal; An emergency power supply output unit (300), used to provide emergency power to the LED lamp; a charging unit (400), used to charge an internal battery when the power supply is normal; and A self-checking unit (500), including multiple control modes, for detecting the state of the emergency power supply; The control unit (200) is a microcontroller based on a 48-pin MCU, which comprises: a voltage detection module (201), used to detect an input voltage and determine an input voltage range; and, A power control module (202) for controlling the output voltage and current of the emergency power supply according to an input voltage range and load requirements; The emergency power supply output unit (300) includes at least one of a constant voltage output mode (301) and a constant power output mode (302); The output voltage of the constant voltage output mode (301) is DC20-400V, and the constant power output mode (302) supports a load voltage of 20-400V constant power.

2. The LED lamp emergency power supply according to claim 1, characterized in that: The power supply voltage range received by the power input unit (100) is AC120-347V; The control unit (200) communicates with an external device via a programming interface, wherein the programming interface comprises a USB and an RJ11 port.

3. The LED lamp emergency power supply according to claim 1 or 2, characterized in that: The power input unit (100) further comprises a lithium battery (101) for storing emergency power, and a battery connected to the emergency power output unit (300). A switching power supply circuit (102) for converting the mains electricity into a charging voltage for the lithium battery (101); A battery protection circuit (103) for preventing the lithium battery (101) from being overcharged or over-discharged; an on-off circuit (104) for controlling the transmission of the voltage of the lithium battery (101); and The detection circuit (501) provided in the self-detection unit (500) is used to detect the state of the switch provided in the LED lamp and output a control signal to the on-off circuit (104).

4. The LED lamp emergency power supply as claimed in claim 3, characterized in that: The self-check unit (500) comprises at least one control mode selected from the group consisting of a button (502), infrared (503), Bluetooth (504) and DALI (505), and the detection circuit (501) is respectively connected to at least one of the button (502), infrared (503), Bluetooth (504) and DALI (505).

5. The LED lamp emergency power supply as claimed in claim 4, characterized in that: The switching power supply circuit (102) comprises: A rectifying circuit (102a) for rectifying AC power into DC power; and A transformer is used to reduce the voltage of the direct current output by the rectifier circuit (102a) and charge the lithium battery (101).

6. The LED lamp emergency power supply as claimed in claim 5, characterized in that: The on-off circuit (104) is a relay circuit, and the relay circuit generates an action according to a detection signal of the detection circuit (501); The detection circuit (501) comprises a feedback circuit (501a) for feedback control of power output of the lithium battery (101), and the feedback circuit (501a) is a photoelectric coupler.

7. The LED lamp emergency power supply according to claim 6, characterized in that: The switching power supply circuit (102) further comprises a boost circuit (102b) for boosting the voltage of the lithium battery (101) to a voltage suitable for lighting of an LED lamp.

8. A method for applying an emergency power supply for an LED lamp as claimed in any one of claims 3 to 7, characterized in that: The following steps are involved: When the mains power fails abnormally, it will automatically switch to emergency power output; After the mains power returns to normal, the emergency function will be automatically exited and the mains power will be used for power supply; The on / off of the on / off circuit (104) is controlled by the detection circuit (501), so as to realize the on / off control of the emergency lighting by the switch of the LED lamp itself; The battery protection circuit (103) is used to prevent the lithium battery (101) from being overcharged or over-discharged.

Images