Emergency lighting lamp circuit

Abstract

The utility model provides an emergency lighting lamp circuit, which belongs to the technical field of electronic circuits and comprises a main power step-down circuit, a main control chip, a main power driving circuit, a battery inversion booster circuit and an emergency lighting lamp interface. The main power step-down circuit comprises a rectifier module and a step-down management module, and a first output end of the rectifier module is electrically connected with the step-down management module; the main control chip is electrically connected with the output end of the voltage reduction management module; the main electric drive circuit is electrically connected with the main control chip and a second output end of the rectifier module respectively; the battery inversion booster circuit is electrically connected with the main control chip; and the emergency lighting lamp interface is electrically connected with the output end of the main power driving circuit and the output end of the battery inversion booster circuit, and can be automatically switched to a standby power supply and continuously provide lighting when the mains supply is powered off.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to an emergency lighting circuit. Background Art

[0002] At present, the power supply system often encounters emergencies such as power outages, voltage fluctuations or power failures, which will affect the normal power supply, especially in places that require continuous lighting, such as hospitals, underground passages, shopping malls and other public places, as well as daily environments such as homes and offices.

[0003] Therefore, it is particularly important to design an emergency lighting circuit that can automatically switch to the backup power supply and continue to provide lighting when the city power is cut off. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art and to provide an emergency lighting circuit which can automatically switch to a backup power supply and continuously provide lighting when the city power fails.

[0005] To achieve the above-mentioned purpose, the embodiment of the present application proposes an emergency lighting circuit, including: a main power step-down circuit, a main control chip, a main power drive circuit, a battery inverter boost circuit and an emergency lighting interface;

[0006] The main power buck circuit includes a rectifier module and a buck management module, and the first output end of the rectifier module is electrically connected to the buck management module;

[0007] The main control chip is electrically connected to the output end of the voltage reduction management module;

[0008] The main power driving circuit is electrically connected to the main control chip and the second output end of the rectifier module respectively;

[0009] The battery inverter boost circuit is electrically connected to the main control chip;

[0010] The emergency lighting interface is electrically connected to the output end of the main electric drive circuit and the output end of the battery inverter boost circuit respectively.

[0011] An emergency lighting circuit provided by the embodiment of the utility model has at least the following beneficial effects: when the mains power is normally supplied, the rectifier module can convert the alternating current of the mains power into direct current and provide a stable direct current power supply for the main power drive circuit; the buck management module can buck the direct current output by the rectifier module to ensure that the voltage meets the working requirements of the main control chip; the bucked voltage is output to the main control chip, so that the main control chip works normally; the main control chip is electrically connected to the main power drive circuit and the battery inverter boost circuit respectively; the main control chip can control the working state of the main power drive circuit and control the battery inverter boost circuit to stop working, so that only the main power drive circuit supplies power to the emergency lighting interface, thereby making the emergency lighting work; when the mains power is cut off, the rectifier module, the main power drive circuit and the buck management module stop working, the main control chip controls the battery inverter boost circuit to work, the battery inverter boost circuit is electrically connected to the battery module, and the battery inverter boost circuit uses the direct current provided by the battery module to generate a voltage suitable for the emergency lighting through inversion and boost processing, so that the emergency lighting can still work normally when the mains power is cut off.

[0012] In some embodiments, the rectifier module includes a rectifier bridge, a first capacitor, a first diode, a second diode and a first fuse, the first fuse is electrically connected to the input end of the rectifier bridge, one end of the first capacitor is electrically connected to the output end of the rectifier bridge, the positive electrode of the first diode and the positive electrode of the second diode, respectively, the cathode of the first diode is electrically connected to the input end of the step-down management module as the first output end of the rectifier module, the cathode of the second diode is electrically connected to the input end of the main electric drive circuit as the second output end of the rectifier module, and the other end of the first capacitor is grounded.

[0013] In some embodiments, the buck management module includes a third diode, a fourth diode, a zener diode, a second capacitor, a third capacitor, a first inductor, a first resistor and a boost chip, the first output end of the boost chip is electrically connected to one end of the second capacitor and the negative electrode of the third diode, respectively, the second output end of the boost chip is electrically connected to one end of the first resistor, one end of the first inductor is electrically connected to the positive electrode of the third diode, one end of the third capacitor and the negative electrode of the zener diode, respectively, the other end of the first inductor is electrically connected to the other end of the second capacitor, the negative electrode of the fourth diode and the other end of the first resistor, the other end of the third capacitor, the positive electrode of the zener diode and the positive electrode of the fourth diode are all grounded.

[0014] In some embodiments, the main power drive circuit includes a constant current drive chip, a fifth diode, a second inductor, a second resistor and a third resistor. The constant current drive chip is electrically connected to the positive electrode of the fifth diode, one end of the second inductor, one end of the second resistor and one end of the third resistor, respectively. The other end of the second resistor and the other end of the third resistor are grounded. The cathode of the fifth diode is electrically connected to the positive input end of the emergency lighting interface, the other end of the second inductor is electrically connected to the negative input end of the emergency lighting interface, and one end of the second inductor is electrically connected to the positive electrode of the fifth diode.

[0015] In some embodiments, the battery inverter boost circuit includes a battery module interface, a transformer, a second fuse, a sixth diode, a seventh diode, a fourth capacitor, a fifth capacitor, a sixth capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an NMOS tube, the battery module interface is electrically connected to one end of the second fuse, the other end of the second fuse is respectively electrically connected to the main control chip and a primary end of the transformer, the other primary end of the transformer is respectively electrically connected to the positive electrode of the sixth diode and the source of the NMOS tube, the negative electrode of the sixth diode is electrically connected to one end of the fourth capacitor, the gate of the NMOS tube is electrically connected to the main control chip The fourth resistor is connected in parallel with the fifth capacitor.

[0016] In some embodiments, a switch line control circuit is further included, and the switch line control circuit is electrically connected to the output end of the buck management module and the main control chip respectively.

[0017] In some embodiments, the switch line control circuit includes a first input control terminal, an optocoupler module, an eighth resistor, a ninth resistor, a tenth resistor and an eighth diode, the first input control terminal is electrically connected to the positive electrode of the eighth diode, the negative electrode of the eighth diode is electrically connected to one end of the eighth resistor, the other end of the eighth resistor is electrically connected to one end of the ninth resistor, one end of the tenth resistor is electrically connected to the other end of the ninth resistor, and the optocoupler module is electrically connected to the other end of the ninth resistor, the other end of the tenth resistor, the output end of the buck management module and the main control chip respectively.

[0018] In some embodiments, it also includes a first voltage detection circuit and a second voltage detection circuit, the input end of the first voltage detection circuit is electrically connected to the output end of the rectifier module, the output end of the first voltage detection circuit is electrically connected to the main control chip, the input end of the second voltage detection circuit is electrically connected to the switch line control circuit, and the output end of the second voltage detection circuit is electrically connected to the main control chip.

[0019] In some embodiments, an indicator light module is also included, which is electrically connected to the main control chip. The indicator light module includes a first indicator light, a second indicator light, a third indicator light and a test switch. The first indicator light, the second indicator light, the third indicator light and the test switch are all electrically connected to the main control chip.

[0020] In some embodiments, it also includes a speaker module and a ninth diode, one end of the speaker module is electrically connected to the main control chip and the positive electrode of the ninth diode, and the other end of the speaker module is electrically connected to the output end of the buck management module and the negative electrode of the ninth diode. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0023] Figure 1 This is a system architecture diagram of an emergency lighting circuit provided by an embodiment of the utility model;

[0024] Figure 2 It is an overall principle diagram of an emergency lighting circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0025] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0026] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0028] At present, the power supply system often encounters emergencies such as power outages, voltage fluctuations or power failures, which will affect the normal power supply, especially in places that require continuous lighting, such as hospitals, underground passages, shopping malls and other public places, as well as daily environments such as homes and offices.

[0029] Therefore, it is particularly important to design an emergency lighting circuit that can automatically switch to the backup power supply and continue to provide lighting when the city power is cut off.

[0030] The embodiment of the utility model provides an emergency lighting circuit, which can automatically switch to a backup power supply and continuously provide lighting when the city power fails.

[0031] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings.

[0032] Reference Figure 1 , Figure 2 The utility model provides an emergency lighting circuit, including: a main power step-down circuit 100, a main control chip U6, a main power drive circuit 200, a battery inverter boost circuit 300 and an emergency lighting interface 400;

[0033] The main power buck circuit 100 includes a rectifier module 110 and a buck management module 120, wherein a first output terminal of the rectifier module 110 is electrically connected to an input terminal of the buck management module 120;

[0034] The main control chip U6 is electrically connected to the output end of the voltage reduction management module 120;

[0035] The main power driving circuit 200 is electrically connected to the main control chip U6 and the second output terminal of the rectifier module 110 respectively;

[0036] The battery inverter boost circuit 300 is electrically connected to the main control chip U6;

[0037] The emergency lighting interface 400 is electrically connected to the output end of the main electric drive circuit 200 and the output end of the battery inverter boost circuit 300 respectively.

[0038] According to an emergency lighting circuit provided by an embodiment of the utility model, when the mains power is normally supplied, the rectifier module 110 can convert the alternating current of the mains power into direct current and provide a stable direct current power supply for the main power drive circuit 200. The voltage reduction management module 120 can reduce the voltage of the direct current output by the rectifier module 110 to ensure that the voltage meets the working requirements of the main control chip U6. The reduced voltage is output to the main control chip U6 so that the main control chip U6 works normally. The main control chip U6 is electrically connected to the main power drive circuit 200 and the battery inverter boost circuit 300 respectively. The main control chip U6 can control the working of the main power drive circuit 200. The main control chip U6 controls the battery inverter boost circuit 300 to work, and controls the battery inverter boost circuit 300 to stop working, so that only the main power drive circuit 200 supplies power to the emergency lighting interface 400, thereby making the emergency lighting work; when the city power is cut off, the rectifier module 110, the main power drive circuit and the buck management module 120 stop working, and the main control chip U6 controls the battery inverter boost circuit 300 to work. The battery inverter boost circuit 300 is electrically connected to the battery module. The battery inverter boost circuit 300 uses the DC power provided by the battery module to generate a voltage suitable for the emergency lighting through inversion and boost processing, so that the emergency lighting can still work normally when the city power is cut off.

[0039] Reference Figure 2 In some embodiments, the rectifier module 110 includes a rectifier bridge U1, a first capacitor C1, a first diode D1, a second diode D2 and a first fuse F1. The first fuse F1 is electrically connected to the input end of the rectifier bridge U1, one end of the first capacitor C1 is electrically connected to the output end of the rectifier bridge U1, the positive electrode of the first diode D1 and the positive electrode of the second diode D2 respectively, the cathode of the first diode D1 is electrically connected to the input end of the step-down management module 120 as the first output end of the rectifier module 110, the cathode of the second diode D2 is electrically connected to the input end of the main power drive circuit 200 as the second output end of the rectifier module 110, and the other end of the first capacitor C1 is grounded.

[0040] It can be understood that the rectifier bridge U1 can convert the AC power of the mains into DC power, provide power to the main power drive circuit 200 through the second diode D2, so that the main power drive circuit 200 works, and provide power to the buck management module 120 through the first diode D1, so that the buck management module 120 works.

[0041] Reference Figure 2In some embodiments, the buck management module 120 includes a third diode D3, a fourth diode D4, a Zener diode, a second capacitor C2, a third capacitor C3, a first inductor L1, a first resistor R1 and a boost chip U2, the first output end of the boost chip U2 is electrically connected to one end of the second capacitor C2 and the cathode of the third diode D3, the second output end of the boost chip U2 is electrically connected to one end of the first resistor R1, one end of the first inductor L1 is electrically connected to the anode of the third diode D3, one end of the third capacitor C3 and the cathode of the Zener diode ZD1, the other end of the first inductor L1 is electrically connected to the other end of the second capacitor C2, the cathode of the fourth diode D4 and the other end of the first resistor R1, the other end of the third capacitor C3, the anode of the Zener diode ZD1 and the anode of the fourth diode D4 are all grounded.

[0042] Preferably, the model of the boost chip U2 is YTE503.

[0043] It can be understood that the step-down circuit formed by the synergistic effect of the boost chip U2, the third diode D3, the fourth diode D4, the Zener diode ZD1, the second capacitor C2, the third capacitor C3, the first inductor L1 and the first resistor R1 can step down the power provided by the rectifier module 110 to a voltage suitable for the operation of the main control chip U6.

[0044] Preferably, the model of the main control chip U6 is YTE1809.

[0045] It should be noted that the main control chip U6 includes 14 pins, and the pin 1 of the main control chip U6 is electrically connected to one end of the first inductor L1.

[0046] Reference Figure 2 In some embodiments, the main power driving circuit 200 includes a constant current driving chip U4, a fifth diode D5, a second inductor L2, a second resistor R2 and a third resistor R3. The constant current driving chip U4 is electrically connected to the positive electrode of the fifth diode D5, one end of the second inductor L2, one end of the second resistor R2 and one end of the third resistor R3, respectively. The other end of the second resistor R2 and the other end of the third resistor R3 are grounded. The cathode of the fifth diode D5 is electrically connected to the positive input end of the emergency lighting interface 400, the other end of the second inductor L2 is electrically connected to the negative input end of the emergency lighting interface 400, and one end of the second inductor L2 is electrically connected to the positive electrode of the fifth diode D5.

[0047] It can be understood that the constant current driver chip U4 can ensure that the emergency lighting maintains a constant current when working.

[0048] Preferably, the model of the constant current driving chip U4 is BP2866.

[0049] It should be noted that the constant current drive chip U4 includes 8 pins, pin 4 of the constant current drive chip U4 is electrically connected to the cathode of the second diode D2, the cathode of the fifth diode D5 and the positive input end of the emergency lighting interface 400, respectively, pin 5 of the constant current drive chip U4 is electrically connected to pin 6 and the positive electrode of the fifth diode D5, respectively, pin 6 of the constant current drive chip U4 is electrically connected to one end of the second inductor L2, pin 2 of the constant current drive chip U4 is electrically connected to one end of the third resistor R3, and pin 8 of the constant current drive chip U4 is electrically connected to one end of the second resistor R2.

[0050] Reference Figure 2 Furthermore, it also includes a first triode Q2 and a nineteenth resistor R19, the pin 3 of the main control chip U6 is electrically connected to one end of the nineteenth resistor R19, the other end of the nineteenth resistor R19 is electrically connected to the base of the first triode Q2, the collector of the first triode Q2 is electrically connected to the pin 2 of the constant current driving chip U4, and the emitter of the first triode Q2 is grounded.

[0051] It should be noted that pin 2 of the constant current driver chip U4 is an overvoltage protection function pin.

[0052] It can be understood that the main control chip U6 pulls down or pulls up the level of the pin 2 of the constant current driving chip U4 by controlling the on and off of the first transistor Q2.

[0053] Furthermore, when the main control chip U6 detects that the voltage output by the rectifier module 110 fluctuates greatly, the main control chip U6 can activate the overvoltage protection function of the constant current driving chip U4 by controlling the first transistor Q2 to ensure the stability and reliability of the circuit.

[0054] Reference Figure 2In some embodiments, the battery inverter boost circuit 300 includes a battery module interface BT1, a transformer U5, a second fuse F2, a sixth diode D6, a seventh diode D7, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and an NMOS tube Q1. The battery module interface BT1 is electrically connected to one end of the second fuse F2, and the other end of the second fuse F2 is electrically connected to the main control chip U6 and a primary end of the transformer U5 respectively. The other primary end of the transformer U5 is electrically connected to the positive electrode of the sixth diode D6 and the source of the NMOS tube Q1 respectively. The negative electrode of the sixth diode D6 is electrically connected to one end of the fourth capacitor C4, and the NMOS tube Q1 is electrically connected to the cathode of the sixth diode D6. The gate of the S tube Q1 is electrically connected to the main control chip U6, the drain of the NMOS tube Q1 is electrically connected to the fifth resistor R5, the sixth resistor R6 and one end of the seventh resistor R7 respectively, the other end of the seventh resistor R7 is electrically connected to one end of the sixth capacitor C6, the other end of the sixth capacitor C6, the other end of the fifth resistor R5 and the other end of the sixth resistor R6 are grounded, the positive electrode of the seventh diode D7 is electrically connected to the primary end of the transformer U5, the negative electrode of the seventh diode D7 is electrically connected to the positive input end of the emergency lighting interface 400 and one end of the fifth capacitor C5 respectively, the other end of the fifth capacitor C5 is electrically connected to the negative input end of the emergency lighting interface 400 and the other secondary end of the transformer U5 respectively, and the fourth resistor R4 is connected in parallel with the fifth capacitor C5.

[0055] It should be noted that the battery module interface BT1 is electrically connected to the battery module, and the pin 2 of the main control chip U6 is electrically connected to one end of the second fuse F2.

[0056] Reference Figure 2 In some embodiments, it also includes a tenth diode D10, a sixteenth resistor R16, a seventeenth resistor R17 and an eighteenth resistor R18, the positive electrode of the tenth diode D10 is electrically connected to pin 2 of the main control chip U6, the negative electrode of the tenth diode D10 is electrically connected to one end of the eighteenth resistor R18 and pin 1 of the main control chip U6, one end of the sixteenth resistor R16 is electrically connected to pin 13 of the main control chip U6, the other end of the sixteenth resistor R16 is electrically connected to one end of the seventeenth resistor R17 and pin 11 of the main control chip U6, the other end of the seventeenth resistor R17 and the other end of the eighteenth resistor R18 are both electrically connected to one end of the fourth capacitor C4.

[0057] It is understandable that when the city power supply stops, the battery module provides power to the main control chip U6, so that the main control chip U6 keeps working, controls the conduction and cutoff of the NMOS tube Q1, and thus enables the battery inverter boost management module to work.

[0058] It should be noted that the pin 12 of the main control chip U6 is electrically connected to the gate of the NMOS tube Q1, and the pin 9 of the main control chip U6 is electrically connected to the other end of the seventh resistor R7. When the pin 12 of the main control chip U6 outputs a high level, the NMOS tube Q1 is turned off. When the pin 12 of the main control chip U6 outputs a low level, the NMOS tube Q1 is turned on.

[0059] Preferably, the model of transformer U5 is EE25.

[0060] It is understandable that the primary end of the transformer U5 is connected to the DC power supply output by the battery module, and the secondary end can induce a high-frequency voltage therefrom and convert the DC voltage into an AC voltage to supply the emergency lighting interface 400 .

[0061] It can be understood that when pin 2 of the main control chip U6 controls the NMOS tube Q1 to turn on, the transformer U5 starts to store energy until pin 12 of the main control chip U6 controls the NMOS tube Q1 to turn off, and the transformer U5 starts to release energy to the secondary end, so that the DC power supply of the battery module can provide power to the emergency lighting interface 400 through the conversion of the transformer U5, thereby enabling the emergency lighting to continue to work when the city power is cut off.

[0062] Reference Figure 2 In some embodiments, a switch line control circuit 500 is further included, and the switch line control circuit 500 is electrically connected to the output end of the buck management module 120 and the main control chip U6 respectively.

[0063] Reference Figure 2 In some embodiments, the switch line control circuit 500 includes a first input control terminal K, an optical coupling module U3, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and an eighth diode D8, the first input control terminal K is electrically connected to the positive electrode of the eighth diode D8, the negative electrode of the eighth diode D8 is electrically connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is electrically connected to one end of the ninth resistor R9, one end of the tenth resistor R10 is electrically connected to the other end of the ninth resistor R9, and the optical coupling module U3 is electrically connected to the other end of the ninth resistor R9, the other end of the tenth resistor R10, the output end of the step-down management module 120 and the main control chip U6 respectively.

[0064] Preferably, a switch control module is connected to the first control end, and the switch control module is electrically connected to the live wire input end of the AC power through the switch line control circuit 500 .

[0065] Reference Figure 2In some embodiments, it also includes a first voltage detection circuit 600 and a second voltage detection circuit 700. The input end of the first voltage detection circuit 600 is electrically connected to the output end of the rectifier module 110, the output end of the first voltage detection circuit 600 is electrically connected to the main control chip U6, the input end of the second voltage detection circuit 700 is electrically connected to the switch line control circuit 500, and the output end of the second voltage detection circuit 700 is electrically connected to the main control chip U6.

[0066] It should be noted that the first voltage detection circuit 600 includes an eleventh resistor R11, a twelfth resistor R12 and a thirteenth resistor R13, one end of the eleventh resistor R11 is electrically connected to the output end of the rectifier bridge U1 in the rectifier module 110, the other end of the eleventh resistor R11 is electrically connected to one end of the twelfth resistor R12, the other end of the twelfth resistor R12 is respectively electrically connected to pin 5 of the main control chip U6 and one end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is grounded.

[0067] It can be understood that the first voltage detection circuit 600 obtains the voltage after rectification and filtering by the rectifier bridge U1 for detection, and feeds back the signal to the pin 5 of the main control chip U6.

[0068] It should be noted that the second voltage detection circuit 700 includes a fourteenth resistor R14 and a fifteenth resistor R15, one end of the fourteenth resistor R14 is electrically connected to the optocoupler module U3, the other end of the fourteenth resistor R14 is respectively electrically connected to pin 10 of the main control chip U6 and one end of the fifteenth resistor R15, and the other end of the fifteenth resistor R15 is grounded.

[0069] It should be noted that the second voltage detection circuit 700 obtains the voltage after the voltage reduction management module 120 is stepped down for detection, and feeds back the signal to the pin 10 of the main control chip U6.

[0070] Reference Figure 2 In some embodiments, a seventh capacitor C7 is further included, one end of the seventh capacitor C7 is electrically connected to the pin 10 of the main control chip U6, and the other end of the seventh capacitor C7 is grounded.

[0071] Reference Figure 2 In some embodiments, an indicator light module 800 is also included. The indicator light module 800 is electrically connected to the main control chip U6. The indicator light module 800 includes a first indicator light Y, a second indicator light G, a third indicator light R and a test switch SW1. The first indicator light Y, the second indicator light G, the third indicator light R and the test switch SW1 are all electrically connected to the main control chip U6.

[0072] It should be noted that the first indicator light Y, the second indicator light G and the third indicator light R are all light emitting diodes, the positive pole of the first indicator light Y and the negative pole of the second indicator light G are electrically connected to pin 7 of the main control chip U6, the positive pole of the third indicator light R and one end of the test switch SW1 are electrically connected to pin 6 of the main control chip U6, the negative pole of the first indicator light Y, the positive pole of the second indicator light G, the negative pole of the third indicator light R and the other end of the test switch SW1 are electrically connected to pin 8 of the main control chip U6.

[0073] Reference Figure 2 In some embodiments, when the AC power is supplied, the main control chip U6 provides power to charge the battery module.

[0074] Preferably, the first indicator light Y is a fault indicator light, the second indicator light G is a main power indicator light, and the third indicator light R is a charging indicator light.

[0075] Furthermore, when the main power step-down management module 120 operates normally, the second indicator light G is on, otherwise, the second indicator light is off and the first indicator light Y is on; when the battery module is in a charging state, the third indicator light R is on, and when the battery module is fully charged, the third indicator light R is off.

[0076] It is understandable that when a fault occurs in the emergency lighting circuit, maintenance personnel can quickly determine where the fault occurs by observing the working status of the indicator light module 800.

[0077] In some embodiments, it also includes a speaker module LS1 and a ninth diode D9, one end of the speaker module LS1 is electrically connected to the main control chip U6 and the positive electrode of the ninth diode D9, and the other end of the speaker module LS1 is electrically connected to the output end of the buck management module 120 and the negative electrode of the ninth diode D9.

[0078] It should be noted that one end of the speaker module LS1 is electrically connected to the pin 4 of the main control chip U6.

[0079] It should be noted that when there is a problem with the voltage detected by the first voltage detection circuit 600 and the second detection circuit 700, the main control chip U6 controls the speaker module LS1 and the indicator light module 800 to work to facilitate maintenance personnel to determine where the fault occurs.

[0080] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. An emergency lighting circuit, characterized in that: include: A main power step-down circuit, the main power step-down circuit comprising a rectifier module and a step-down management module, wherein a first output end of the rectifier module is electrically connected to the step-down management module; A main control chip, the main control chip is electrically connected to the output end of the voltage reduction management module; A main electric drive circuit, the main electric drive circuit is electrically connected to the main control chip and the second output end of the rectifier module respectively; A battery inverter boost circuit, the battery inverter boost circuit is electrically connected to the main control chip; An emergency lighting lamp interface is electrically connected to the output end of the main electric drive circuit and the output end of the battery inverter boost circuit respectively.

2. The emergency lighting circuit according to claim 1, characterized in that: The rectifier module includes a rectifier bridge, a first capacitor, a first diode, a second diode and a first fuse. The first fuse is electrically connected to the input end of the rectifier bridge, one end of the first capacitor is electrically connected to the output end of the rectifier bridge, the positive electrode of the first diode and the positive electrode of the second diode respectively, the cathode of the first diode is electrically connected to the input end of the step-down management module as the first output end of the rectifier module, the cathode of the second diode is electrically connected to the input end of the main electric drive circuit as the second output end of the rectifier module, and the other end of the first capacitor is grounded.

3. The emergency lighting circuit according to claim 1, characterized in that: The step-down management module includes a third diode, a fourth diode, a voltage-stabilizing diode, a second capacitor, a third capacitor, a first inductor, a first resistor and a boost chip. The first output end of the boost chip is electrically connected to one end of the second capacitor and the negative electrode of the third diode, respectively. The second output end of the boost chip is electrically connected to one end of the first resistor. One end of the first inductor is electrically connected to the positive electrode of the third diode, one end of the third capacitor and the negative electrode of the voltage-stabilizing diode, respectively. The other end of the first inductor is electrically connected to the other end of the second capacitor, the negative electrode of the fourth diode and the other end of the first resistor, respectively. The other end of the third capacitor, the positive electrode of the voltage-stabilizing diode and the positive electrode of the fourth diode are all grounded.

4. The emergency lighting circuit according to claim 1, characterized in that: The main power drive circuit includes a constant current drive chip, a fifth diode, a second inductor, a second resistor and a third resistor. The constant current drive chip is electrically connected to the positive electrode of the fifth diode, one end of the second inductor, one end of the second resistor and one end of the third resistor, respectively. The other end of the second resistor and the other end of the third resistor are grounded. The cathode of the fifth diode is electrically connected to the positive input end of the emergency lighting interface, the other end of the second inductor is electrically connected to the negative input end of the emergency lighting interface, and one end of the second inductor is electrically connected to the anode of the fifth diode.

5. The emergency lighting circuit according to claim 1, characterized in that: The battery inverter boost circuit includes a battery module interface, a transformer, a second fuse, a sixth diode, a seventh diode, a fourth capacitor, a fifth capacitor, a sixth capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an NMOS tube. The battery module interface is electrically connected to one end of the second fuse, the other end of the second fuse is respectively electrically connected to the main control chip and a primary end of the transformer, the other primary end of the transformer is respectively electrically connected to the positive electrode of the sixth diode and the source electrode of the NMOS tube, the negative electrode of the sixth diode is electrically connected to one end of the fourth capacitor, and the gate of the NMOS tube is electrically connected to the main control chip. The drain of the NMOS tube is electrically connected to one end of the fifth resistor, the sixth resistor and the seventh resistor respectively, the other end of the seventh resistor is electrically connected to one end of the sixth capacitor, the other end of the sixth capacitor, the other end of the fifth resistor and the other end of the sixth resistor are grounded, the positive electrode of the seventh diode is electrically connected to a secondary end of the transformer, the negative electrode of the seventh diode is electrically connected to the positive input end of the emergency lighting interface and one end of the fifth capacitor respectively, the other end of the fifth capacitor is electrically connected to the negative input end of the emergency lighting interface and the other secondary end of the transformer respectively, and the fourth resistor is connected in parallel with the fifth capacitor.

6. The emergency lighting circuit according to claim 1, characterized in that: It also includes a switch line control circuit, which is electrically connected to the output end of the buck management module and the main control chip respectively.

7. The emergency lighting circuit according to claim 6, characterized in that: The switch line control circuit includes a first input control terminal, an optocoupler module, an eighth resistor, a ninth resistor, a tenth resistor and an eighth diode, the first input control terminal is electrically connected to the positive electrode of the eighth diode, the negative electrode of the eighth diode is electrically connected to one end of the eighth resistor, the other end of the eighth resistor is electrically connected to one end of the ninth resistor, one end of the tenth resistor is electrically connected to the other end of the ninth resistor, and the optocoupler module is electrically connected to the other end of the ninth resistor, the other end of the tenth resistor, the output end of the step-down management module and the main control chip respectively.

8. The emergency lighting circuit according to claim 6, characterized in that: It also includes a first voltage detection circuit and a second voltage detection circuit, wherein the input end of the first voltage detection circuit is electrically connected to the rectifier module, the output end of the first voltage detection circuit is electrically connected to the main control chip, the input end of the second voltage detection circuit is electrically connected to the switch line control circuit, and the output end of the second voltage detection circuit is electrically connected to the main control chip.

9. The emergency lighting circuit according to claim 1, characterized in that: It also includes an indicator light module, which is electrically connected to the main control chip. The indicator light module includes a first indicator light, a second indicator light, a third indicator light and a test switch. The first indicator light, the second indicator light, the third indicator light and the test switch are all electrically connected to the main control chip.

10. The emergency lighting circuit according to claim 1, characterized in that: It also includes a speaker module and a ninth diode. One end of the speaker module is electrically connected to the main control chip and the positive electrode of the ninth diode respectively, and the other end of the speaker module is electrically connected to the output end of the buck management module and the negative electrode of the ninth diode respectively.

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