Power supply circuit of emergency lighting lamp and emergency lighting lamp

Abstract

The utility model provides a power supply circuit of an emergency lighting lamp and the emergency lighting lamp, and relates to the technical field of lamps, the power supply circuit of the emergency lighting lamp comprises a commercial power detection circuit, the input end of the commercial power detection circuit is connected with commercial power, and the commercial power detection circuit is used for detecting the operation state of the commercial power and outputting a corresponding detection signal; a battery pack; the input end of the booster circuit is connected with the output end of the battery pack, the controlled end of the booster circuit is connected with the output end of the mains supply detection circuit, and the booster circuit is used for connecting a power supply of the battery pack and boosting the power supply to a preset voltage when the detection signal is no mains supply. The technical scheme of the utility model can rapidly switch to the battery pack for power supply when the commercial power is interrupted or unstable, ensures the normal operation of the emergency lighting lamp, has a simple circuit structure, and reduces the cost.

Description

Technical Field

[0001] The present application relates to the technical field of lighting fixtures, and particularly to a power supply circuit for an emergency lighting lamp and an emergency lighting lamp. Background Art

[0002] When the mains power supply is normal, existing emergency lighting lamps usually use the mains power supply directly to save the energy of the battery pack. However, in the case of a sudden interruption or instability of the mains power supply, the emergency lighting lamp needs to quickly switch to the battery pack power supply to ensure that the lighting is not affected. However, when existing emergency lighting lamps switch between the mains power supply and the battery pack, there are often problems such as slow switching speed and poor stability. Moreover, the battery pack power supply circuit of existing emergency lighting lamps is complex and costly, which is not conducive to large-scale production and popularization. Summary of the Utility Model

[0003] The main object of the present utility model is to provide a power supply circuit for an emergency lighting lamp, aiming to improve the switching speed and stability of the emergency lighting lamp, and at the same time simplify the battery pack power supply circuit and reduce costs.

[0004] To achieve the above object, a power supply circuit for an emergency lighting lamp proposed by the present utility model includes:

[0005] A mains power detection circuit, the input end of the mains power detection circuit is connected to the mains power supply, and the mains power detection circuit is used to detect the operating state of the mains power supply and output a corresponding detection signal;

[0006] A battery pack;

[0007] A boost circuit, the input end of the boost circuit is connected to the output end of the battery pack, the controlled end of the boost circuit is connected to the output end of the mains power detection circuit, and the boost circuit is used to connect the power supply of the battery pack and boost it to a preset voltage when the detection signal indicates no mains power.

[0008] Optionally, the mains power detection circuit includes:

[0009] A first terminal;

[0010] A first switch, a first series resistor group is connected between the first end of the first switch and the first end of the first terminal, and a second series resistor group is connected between the second end of the first switch and the second end of the first terminal;

[0011] A transformer, the first primary end of the transformer is connected to the third end of the first switch, the second primary end of the transformer is connected to the fourth end of the first switch, a first diode is connected between the first secondary end of the transformer and the ground, a second diode is connected between the second secondary end of the transformer and the ground, and a clamping diode is connected between the first secondary end and the second secondary end of the transformer;

[0012] A third diode, the positive electrode of the third diode is connected to the second secondary terminal of the transformer, and a first resistor is connected between the third diode and the ground;

[0013] A fourth diode, the positive electrode of the fourth diode is connected to the first secondary terminal of the transformer, at least one or more capacitors are connected between the fourth diode and the ground, and the negative electrode of the fourth diode is connected to the negative electrode of the third diode.

[0014] Optionally, the voltage amplitude of the battery pack is 9 - 15V.

[0015] Optionally, the boost circuit includes:

[0016] A second switch, the first end of the second switch is connected to the positive electrode of the battery pack;

[0017] A third switch, the first end of the third switch is connected to the second end of the second switch;

[0018] A first switching element, the input end of the first switching element is connected to the second end of the second switch, and a second resistor is connected between the controlled end and the input end of the first switching element;

[0019] A fifth diode, the positive electrode of the fifth diode is connected to the output end of the first switching element;

[0020] A sixth diode, a first capacitor is connected between the negative electrode of the sixth diode and the second end of the third switch;

[0021] A second switching element, the controlled end of the second switching element is connected to the negative electrode of the sixth diode, a third resistor is connected between the first conducting end and the controlled end of the second switching element, the second conducting end of the second switching element is grounded, and a fourth resistor is connected between the controlled end and the second conducting end of the second switching element;

[0022] A fifth resistor, a sixth resistor is connected between the first end of the fifth resistor and the output end of the first switching element, the second end of the fifth resistor is grounded, and at least one or more capacitors are connected in parallel across both ends of the fifth resistor.

[0023] Optionally, it further includes:

[0024] A control circuit, the first input end of the control circuit is connected to the output end of the mains detection circuit, the first output end of the control circuit is connected to the controlled end of the boost circuit, and the control circuit is used to output a corresponding control signal to the boost circuit according to the detection signal.

[0025] Optionally, it further includes:

[0026] A temperature detection circuit, the output end of the temperature detection circuit is connected to the second input end of the control circuit, and the temperature detection circuit is used to detect the temperature during the charging or discharging process of the battery pack to output a corresponding temperature signal to the control circuit.

[0027] Optionally, it further includes:

[0028] A battery charging circuit, the controlled end of the battery charging circuit is connected to the second output end of the control circuit, the input end of the battery charging circuit is used to access the stepped-down mains power, and the output end of the battery charging circuit is connected to the power input end of the battery pack.

[0029] Optionally, the battery charging circuit includes:

[0030] A first chip, the controlled end of the first chip is connected to the second output end of the control circuit, at least one capacitor is connected between the power input end of the first chip and the ground, and a seventh diode is connected between the power input end and the feedback end of the first chip;

[0031] A third switching element, the controlled end of the third switching element is connected to the first control end of the first chip, and the first conduction end of the third switching element is grounded;

[0032] A fourth switching element, a seventh resistor is connected between the controlled end of the fourth switching element and the second control end of the first chip, and the controlled end of the fourth switching element is connected to the second conduction end of the third switching element;

[0033] A fifth switching element, an eighth resistor is connected between the controlled end of the fifth switching element and the third control end of the first chip, the first conduction end of the fifth switching element is connected to the second conduction end of the fourth switching element, at least one capacitor is connected between the second conduction end of the fifth switching element and the ground, and the second conduction end of the fifth switching element is used to access the stepped-down mains power;

[0034] A first inductor, the first end of the first inductor is connected to the power input end of the battery pack, the second end of the first inductor is connected to the power output end of the first chip, and the second end of the first inductor is connected to the common node of the fourth switching element and the fifth switching element.

[0035] Optionally, the battery charging circuit includes:

[0036] A charging current detection circuit, the input end of the charging current detection circuit is connected to the input end of the battery pack, the output end of the charging current detection circuit is connected to the third input end of the control circuit, and the charging current detection circuit is used to monitor the input current during the charging process of the battery pack and output a corresponding current signal.

[0037] In addition, to achieve the above object, the present utility model also provides an emergency lighting lamp, and the emergency lighting lamp includes the power supply circuit of the emergency lighting lamp as described above.

[0038] In the embodiment of the present utility model, the mains detection circuit is connected to the mains to detect the operating state of the mains and output a corresponding detection signal. Then, the boost circuit is respectively connected to the battery pack and the mains detection circuit to connect to the power supply of the battery pack and boost it to a preset voltage for use by the emergency lighting lamp when the detection signal indicates no mains power, so as to quickly switch to battery pack power supply when the mains power is interrupted or unstable, ensure the normal operation of the emergency lighting lamp, and the circuit structure is simple, reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 It is a structural block diagram of an embodiment of the power supply circuit of the emergency lighting lamp of the present utility model;

[0041] Figure 2 It is a structural block diagram of another embodiment of the power supply circuit of the emergency lighting lamp of the present utility model;

[0042] Figure 3 It is a structural block diagram of still another embodiment of the power supply circuit of the emergency lighting lamp of the present utility model;

[0043] Figure 4 It is a structural block diagram of another embodiment of the power supply circuit of the emergency lighting lamp of the present utility model;

[0044] Figure 5 It is a structural block diagram of still another embodiment of the power supply circuit of the emergency lighting lamp of the present utility model;

[0045] Figure 6 For Figure 1 the circuit principle schematic diagram of the mains detection circuit in

[0046] Figure 7 For Figure 1Schematic diagram of the circuit principle of the boost circuit therein;

[0047] Figure 8 is Figure 3 Schematic diagram of the circuit principle of the temperature detection circuit therein;

[0048] Figure 9 is Figure 4 Schematic diagram of the circuit principle of the battery charging circuit therein.

[0049] Explanation of the reference numerals in the drawings:

[0050] Label Name Label Name 100 Mains power detection circuit 500 Temperature detection circuit 200 Battery pack 600 Battery charging circuit 300 Boost circuit 610 Charging current detection circuit 400 Control circuit - -

[0051] The realization, functional features and advantages of the purpose of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0052] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0053] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0054] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of the technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of the technical solutions does not exist and is not within the protection scope required by the present utility model.

[0055] In an embodiment of the present utility model, as Figure 1 shown, the power supply circuit of the emergency lighting lamp includes a mains detection circuit 100, a battery pack 200 and a boost circuit 300, wherein:

[0056] The input end of the mains power detection circuit 100 is connected to the mains power. The mains power detection circuit 100 is used to detect the operating state of the mains power and output a corresponding detection signal. The input end of the boost circuit 300 is connected to the output end of the battery pack 200, and the controlled end of the boost circuit 300 is connected to the output end of the mains power detection circuit 100. The boost circuit 300 is used to connect to the power supply of the battery pack 200 and boost it to a preset voltage when the detection signal indicates no mains power.

[0057] In this embodiment, the mains power detection circuit 100 can be a comparator circuit based on a specific voltage threshold. This circuit determines whether the mains power is in a normal power supply state by detecting the voltage level of the mains power. Once the mains voltage is lower than the preset threshold, the mains power detection circuit 100 outputs a low-level signal, indicating that there is no mains power supply currently. This detection signal will be used as a control signal and can be directly input to the controlled end of the boost circuit 300.

[0058] In this embodiment, the main function of the boost circuit 300 is to convert the relatively low voltage provided by the battery pack 200 into the high voltage required for the emergency lighting lamp. The boost circuit 300 is usually composed of a series of electronic components such as transistors, diodes, inductors, and capacitors, and realizes the voltage increase through a switching regulation and energy storage conversion mechanism. When the mains power detection circuit 100 outputs a low-level signal, the boost circuit 300 starts to work under the control of the detection signal, boosting the power supply of the battery pack 200 to the preset voltage level to meet the lighting requirements of the emergency lighting lamp. In this implementation, the preset voltage can be 36V to 42V, and 36V or 42V is commonly used. This power supply circuit has a simple structure, low cost, and is easy to implement.

[0059] Optionally, the voltage amplitude of the battery pack 200 is 9 - 15V. This voltage range is determined according to the power demand of the emergency lighting lamp and the discharge characteristics of the battery pack 200 itself. Such a voltage range can not only ensure that the battery pack 200 can still maintain a certain voltage level after long-term discharge, but also meet the power demand of the emergency lighting lamp during startup and operation. In addition, this voltage range also helps to protect the battery pack 200 and avoid damage caused by over-discharge.

[0060] It should be noted that although the power supply circuit and the control circuit 400 in the above embodiments adopt specific structures and connection methods, the present invention is not limited to this. In practical applications, the power supply circuit and the mains power detection circuit 100 can be appropriately adjusted and optimized according to the specific requirements and working environment of the emergency lighting lamp to meet different usage requirements. For example, more safety protection measures such as over-current protection, over-voltage protection, and short-circuit protection can be added to improve the safety and reliability of the emergency lighting lamp and enhance the performance and efficiency of the emergency lighting lamp.

[0061] The technical solution of the present utility model is provided with a mains detection circuit 100 to access the mains power, detect the operating state of the mains power, and output a corresponding detection signal. Then, a boost circuit 300 is provided and connected to the battery pack 200 and the mains detection circuit 100 respectively, so that when the detection signal indicates no mains power, the power supply of the battery pack 200 is connected and boosted to a preset voltage to be supplied to the emergency lighting lamp. It can quickly switch to the battery pack 200 for power supply when the mains power is interrupted or unstable, ensuring the normal operation of the emergency lighting lamp, and the circuit structure is simple, reducing the cost.

[0062] With reference to Figure 6 shown, further, another embodiment of the present utility model provides a power supply circuit for an emergency lighting lamp. Based on the above Figure 1 shown embodiment, the mains detection circuit 100 includes a first terminal CN3, a first switch K2, a transformer T1, a third diode D5, and a fourth diode D7, where:

[0063] A first series resistor group is connected between the first end of the first switch K2 and the first end of the first terminal CN3, and a second series resistor group is connected between the second end of the first switch K2 and the second end of the first terminal CN3; the first primary end of the transformer T1 is connected to the third end of the first switch K2, the second primary end of the transformer T1 is connected to the fourth end of the first switch K2, a first diode D8 is connected between the first secondary end of the transformer T1 and the ground, a second diode D6 is connected between the second secondary end of the transformer T1 and the ground, and a clamping diode TV1 is connected between the first secondary end and the second secondary end of the transformer T1; the positive electrode of the third diode D5 is connected to the second secondary end of the transformer T1, and a first resistor R131 is connected between the third diode D5 and the ground; the positive electrode of the fourth diode D7 is connected to the first secondary end of the transformer T1, at least one or more capacitors are connected between the fourth diode D7 and the ground, and the negative electrode of the fourth diode D7 is connected to the negative electrode of the third diode D5.

[0064] In this embodiment, the first switch K2 can be a mechanical push-button switch, which is turned on under the user's selection to control the working state of the mains detection circuit 100. The first terminal CN3 is used to access the positive and negative poles of the mains power to ensure that the mains power can enter the detection circuit normally. The first series resistor group and the second series resistor group are used to limit the current to prevent the circuit from being damaged due to excessive current when the mains power is connected. The resistance values and the number of series resistors of these resistors can be adjusted according to actual needs to achieve the best current limiting effect.

[0065] In this embodiment, the transformer T1 is used to reduce the voltage of the mains power supply to a voltage level suitable for detection. Among them, the first primary terminal and the second primary terminal of the transformer T1 are respectively connected to the third terminal and the fourth terminal of the first switch K2. By controlling the on-off of the first switch K2, the input voltage of the transformer T1 can be controlled. The first secondary terminal and the second secondary terminal of the transformer T1 are respectively connected to the ground through the first diode D8 and the second diode D6, forming a simple rectifier circuit to convert alternating current into direct current, which is convenient for the subsequent detection circuit to process.

[0066] Among them, the function of the clamping diode TV1 is to limit the output voltage of the transformer T1 to prevent it from being too high and damaging other components in the circuit. When the output voltage of the transformer T1 exceeds the breakdown voltage of the clamping diode TV1, the clamping diode TV1 will conduct to protect other components in the circuit from being damaged.

[0067] Among them, the third diode D5, the fourth diode D7, the first diode D8 and the second diode D6 form a full-bridge rectifier, which is used to convert the alternating current output by the transformer T1 into direct current and filter out the ripples therein to provide a stable DC power supply for the subsequent circuit. The positive electrode of the third diode D5 is connected to the second secondary terminal of the transformer T1 and is connected to the ground through the first resistor R131, which plays a role in stabilizing the voltage and preventing overcurrent. The positive electrode of the fourth diode D7 is connected to the first secondary terminal of the transformer T1, and its negative electrode is connected to the negative electrode of the third diode D5 and is filtered through a capacitor bank to ensure that the output DC power supply is more stable and reliable.

[0068] In this embodiment, by adjusting the state of the first switch K2, the working state of the mains power detection circuit 100 can be controlled. When the first switch K2 is in the on state, the mains power supply will enter the transformer T1 through the first series resistor group and the second series resistor group. The transformer T1 will reduce the voltage of the mains power supply to a voltage level suitable for detection, and finally detect the level signal at the common node of the third diode D5 and the fourth diode D7. When a level signal is detected, it means that the mains power supply exists, and a detection signal indicating the presence of the mains power supply is output; when it is detected that the mains power supply does not exist, a detection signal indicating the absence of the mains power supply is output, that is, a signal opposite to the detection signal indicating the presence of the mains power supply. This detection signal will be used as a control signal to control the power supply circuit of the emergency lighting lamp to switch.

[0069] In this embodiment, by adopting the mains power detection circuit 100 with the above structure, the operating state of the mains power supply can be accurately detected, and the power supply can be quickly switched to the battery pack 200 when the mains power supply is interrupted or unstable. At the same time, the power supply circuit has a simple structure, low cost, is easy to implement and maintain, and has high practicability and reliability.

[0070] With reference to Figure 7As shown, further, another embodiment of the present utility model provides a power supply circuit for an emergency lighting lamp. Based on the above Figure 1 shown embodiment, the boost circuit 300 includes a second switch K6, a third switch K4, a first switching element Q28, a fifth diode D26, a sixth diode D17, a second switching element Q25, and a fifth resistor R95, wherein:

[0071] The first end of the second switch K6 is connected to the positive pole of the battery pack 200; the first end of the third switch K4 is connected to the second end of the second switch K6; the input end of the first switching element Q28 is connected to the second end of the second switch K6, and a second resistor R93 is connected between the controlled end and the input end of the first switching element Q28; the positive pole of the fifth diode D26 is connected to the output end of the first switching element Q28; a first capacitor C22 is connected between the negative pole of the sixth diode D17 and the second end of the third switch K4; the controlled end of the second switching element Q25 is connected to the negative pole of the sixth diode D17, a third resistor R92 is connected between the first conduction end of the second switching element Q25 and the controlled end of the first switching element Q28, the second conduction end of the second switching element Q25 is grounded, and a fourth resistor R76 is connected between the controlled end and the second conduction end of the second switching element Q25; a sixth resistor R94 is connected between the first end of the fifth resistor R95 and the output end of the first switching element Q28, the second end of the fifth resistor R95 is grounded, and at least one or more capacitors are connected in parallel across the two ends of the fifth resistor R95.

[0072] In this embodiment, the first switching element Q28 can be a field effect transistor (FET) or a similar electronic switching device, which is used to control the on / off of the current of the battery pack 200. The second switch K6 and the third switch K4 can be manual or automatic switches, which are used to switch the working state of the circuit when needed. The second resistor R93 serves as the gate resistor of the first switching element Q28, which is used to stabilize the gate voltage and prevent overcurrent. The first capacitor C22 is used to filter out high-frequency noise in the circuit to ensure the stable operation of the circuit. The second switching element Q25 here serves as a trigger, and its controlled terminal (such as the gate or base) receives the detection signal from the sixth diode D17. When there is a voltage change at the negative electrode (i.e., the cathode) of the sixth diode D17, the state of the second switching element Q25 will change, thereby controlling the on / off of the first switching element Q28. The third resistor R92 and the fourth resistor R76 are used to adjust the trigger voltage and sensitivity of the second switching element Q25. The sixth resistor R94 and the fifth resistor R95 are connected in series, which is used to limit the current passing through the fifth resistor R95 to prevent it from being too large and causing damage to the circuit. In the normal working state, the second switch K6 is closed, and the current of the battery pack 200 enters the input terminal of the first switching element Q28 through the third switch K4 and the second switch K6. At this time, since the second resistor R93 is connected between the controlled terminal and the input terminal of the first switching element Q28, the first switching element Q28 is in the off state, and the current of the battery pack 200 cannot pass through. When it is necessary to start the emergency lighting lamp, the third switch K4 is closed, and the voltage at the negative electrode (cathode) of the sixth diode D17 changes, triggering the second switching element Q25 to conduct. The conduction of the second switching element Q25 causes the voltage at the controlled terminal of the first switching element Q28 to drop, making the first switching element Q28 also conduct, and the current of the battery pack 200 flows out through the first switching element Q28 and the fifth diode D26 to supply power to the emergency lighting lamp.

[0073] In addition, the RC circuit composed of the fifth resistor R95 and the parallel capacitor plays a role in stabilizing the output voltage. When the output voltage increases, the current passing through the fifth resistor R95 increases, resulting in a faster charging speed of the capacitor, thereby stabilizing the output voltage. When the output voltage decreases, the current passing through the fifth resistor R95 decreases, and the discharging speed of the capacitor slows down, which also plays a role in stabilizing the output voltage.

[0074] By adopting the boost circuit 300 with the above structure, it can quickly switch to the power supply of the battery pack 200 when the mains power is interrupted or unstable, ensuring the normal operation of the emergency lighting lamp. This circuit structure is simple, low in cost, easy to implement and maintain, and has high practicability and reliability.

[0075] With reference to Figure 2 shown, further, another embodiment of the present invention provides a power supply circuit for an emergency lighting lamp, based on the above Figure 1 、Figure 6 Or Figure 7 In any of the illustrated embodiments, the power supply circuit of the emergency lighting lamp further includes a control circuit 400, where:

[0076] The first input end of the control circuit 400 is connected to the output end of the mains detection circuit 100, and the first output end of the control circuit 400 is connected to the controlled end of the boost circuit 300. The control circuit 400 is configured to output a corresponding control signal to the boost circuit 300 according to the detection signal.

[0077] In this embodiment, the control circuit 400 can be a simple logic circuit, such as a microcontroller, a logic gate circuit, or a programmable logic device (such as an FPGA). It receives the detection signal from the mains detection circuit 100 and outputs a corresponding control signal to the controlled end of the boost circuit 300 according to the state of this signal.

[0078] In this embodiment, compared with Figure 1 the illustrated embodiment, which introduces the control circuit 400 to make the power supply circuit of the emergency lighting lamp more complete in function and more intelligent in operation. The introduction of the control circuit 400 can, according to the detection signal output by the mains detection circuit 100, control the working state of the boost circuit 300 in real time, so as to more accurately control the power supply of the emergency lighting lamp. When the mains detection circuit 100 detects the presence of mains, the output end of the mains detection circuit 100 will output a detection signal indicating the presence of mains to the first input end of the control circuit 400. After receiving this signal, the control circuit 400 will determine that the mains is in a normal state, so it will not output any control signal to the controlled end of the boost circuit 300. At this time, the emergency lighting lamp is powered by the mains. When the mains detection circuit 100 detects the absence or instability of the mains, it will output a detection signal indicating the absence of mains to the first input end of the control circuit 400. After receiving this signal, the control circuit 400 will determine that the mains has been interrupted or is unstable, so it needs to switch to the battery pack 200 for power supply. Then, it will output a control signal to the controlled end of the boost circuit 300, triggering the boost circuit 300 to start working, boosting the voltage of the battery pack 200 to a voltage level suitable for the emergency lighting lamp to use, and supplying power to the emergency lighting lamp through the fifth diode D26, which can ensure that when the mains is interrupted or unstable, it can quickly switch to the battery pack 200 for power supply, ensure the normal operation of the emergency lighting lamp, greatly improve the reliability and practicality of the emergency lighting lamp, and enable it to play a good lighting effect in various emergencies.

[0079] In this embodiment, the power supply circuit of the emergency lighting lamp further includes a display and interaction circuit, which is electrically connected to the control circuit 400. The display and interaction circuit can be composed of a liquid crystal display module or a TTF display module. The display and interaction circuit is used to implement instructions for one-key start of emergency, monthly inspection, quarterly inspection or patrol inspection, and can also be used to view the main power / battery voltage, current, temperature, fault type and fault alarm record. It not only serves as a platform for information display, but also acts as a bridge for communication between users and the emergency lighting system. Among them, users can directly trigger the one-key start of the emergency lighting lamp through a specific button on the display and interaction circuit, without relying on external power detection, which greatly improves the emergency response speed. Among them, the emergency lighting lamp supports various inspection modes such as monthly inspection, quarterly inspection and patrol inspection, and users can select the corresponding inspection cycle according to actual needs. In the inspection mode, the display and interaction circuit will guide users to perform a series of operations and display the inspection results in real time, including voltage stability, current change, whether the temperature is abnormal, etc., to ensure that the emergency lighting system is always in the best state. Among them, the display and interaction circuit can display key parameters such as main power / battery voltage, current and temperature in real time. Once an abnormality is found, such as too low voltage, too large current or too high temperature, the alarm mechanism will be immediately activated to remind users to pay attention through means such as sound, light flash or screen prompt, and automatically record the fault type and alarm record for subsequent fault troubleshooting and maintenance.

[0080] With reference to Figure 3 and Figure 8 shown, further, another embodiment of the present invention provides a power supply circuit of an emergency lighting lamp. Based on the above Figure 2 shown embodiment, the power supply circuit of the emergency lighting lamp further includes a temperature detection circuit 500, wherein:

[0081] The output end of the temperature detection circuit 500 is connected to the second input end of the control circuit 400. The temperature detection circuit 500 is used to detect the temperature during the charging or discharging process of the battery pack 200, so as to output a corresponding temperature signal to the control circuit 400.

[0082] The temperature detection circuit 500 includes a temperature sensor terminal CN11 and a ninth resistor R99. A temperature sensor is inserted through the temperature sensor terminal CN11, and the second end of the ninth resistor R99 is connected to the ground, so that the temperature signal transmitted back by the temperature sensor can be pulled down and then transmitted to the control circuit 400.

[0083] In this embodiment, the temperature detection circuit 500 includes a temperature sensor, where the temperature sensor can be disposed near the battery pack 200 or in direct contact with the battery pack 200 to detect in real time the temperature change of the battery pack 200 during charging or discharging. The output end of the temperature detection circuit 500 is connected to the second input end of the control circuit 400 to transmit the detected temperature signal to the control circuit 400 in real time.

[0084] After receiving the temperature signal, the control circuit 400 makes a judgment according to a preset temperature threshold and outputs a corresponding control signal. When the detected temperature exceeds the preset upper limit threshold, the control circuit 400 determines that the battery pack 200 may be overheated. At this time, a control signal is output to the boost circuit 300 to stop its operation or reduce the power output, so as to prevent the battery pack 200 from being damaged due to overheating or causing a safety accident. At the same time, the control circuit 400 can also output an alarm signal to remind the user that the temperature of the battery pack 200 is too high and corresponding treatment is required.

[0085] When the detected temperature is lower than the preset lower limit threshold, the control circuit 400 determines that the battery pack 200 may be too cold. At this time, a control signal can be output to the heating element of the emergency lighting lamp (if any) to heat the battery pack 200 to improve its working efficiency and safety.

[0086] By introducing the temperature detection circuit 500, the power supply circuit of the emergency lighting lamp in this embodiment can monitor the temperature in real time during the charging or discharging process of the battery pack 200 and intelligently control the working state of the emergency lighting lamp according to the temperature situation, thus greatly improving the safety and reliability of the emergency lighting lamp. In addition, the temperature detection circuit 500 can also be linked with other functions of the control circuit 400, such as cooperating with the charging circuit, discharging circuit, etc., to adjust parameters such as the charging or discharging current and voltage according to the temperature situation of the battery pack 200, further optimizing the use efficiency and service life of the battery pack 200.

[0087] With reference to Figure 4 shown, further, another embodiment of the present utility model provides a power supply circuit of an emergency lighting lamp. Based on the above Figure 2 shown embodiment, the power supply circuit of the emergency lighting lamp further includes a battery charging circuit 600, where:

[0088] The controlled end of the battery charging circuit 600 is connected to the second output end of the control circuit 400. The input end of the battery charging circuit 600 is used to access the stepped-down commercial power. The output end of the battery charging circuit 600 is connected to the power input end of the battery pack 200.

[0089] In this embodiment, the battery charging circuit 600 is used to charge the battery pack 200 when the mains power is normal, so as to ensure that the battery pack 200 has sufficient power to supply power to the emergency lighting lamp when the mains power is interrupted or unstable. The battery charging circuit 600 may include a charging current regulator and related charging protection circuits to ensure the safety and efficiency of the charging process. When the mains power detection circuit 100 detects the presence and stability of the mains power, the control circuit 400 will output a charging enable signal to the controlled terminal of the battery charging circuit 600, triggering the battery charging circuit 600 to start working, so as to ensure that the battery pack 200 is charged in a safe and efficient state. This design enables the emergency lighting lamp to maintain an efficient and stable lighting effect in various environments.

[0090] With reference to Figure 9 shown, further, another embodiment of the present invention provides a power supply circuit of an emergency lighting lamp. Based on the above Figure 4 shown embodiment, the battery charging circuit 600 includes a first chip U15, a third switching element Q3, a fourth switching element Q8, a fifth switching element Q9, and a first inductor L7, wherein:

[0091] The controlled terminal of the first chip U15 is connected to the second output terminal of the control circuit 400. At least one capacitor is connected between the power input terminal of the first chip U15 and the ground. A seventh diode D3 is connected between the power input terminal and the feedback terminal of the first chip U15; the controlled terminal of the third switching element Q3 is connected to the first control terminal of the first chip U15, and the first conduction terminal of the third switching element Q3 is grounded; a seventh resistor R35 is connected between the controlled terminal of the fourth switching element Q8 and the second control terminal of the first chip U15, and the controlled terminal of the fourth switching element Q8 is connected to the second conduction terminal of the third switching element Q3; an eighth resistor R38 is connected between the controlled terminal of the fifth switching element Q9 and the third control terminal of the first chip U15. The first conduction terminal of the fifth switching element Q9 is connected to the second conduction terminal of the fourth switching element Q8. At least one capacitor is connected between the second conduction terminal of the fifth switching element Q9 and the ground. The second conduction terminal of the fifth switching element Q9 is used to connect to the stepped-down mains power; the first end of the first inductor L7 is connected to the power input terminal of the battery pack 200, the second end of the first inductor L7 is connected to the power output terminal of the first chip U15, and the second end of the first inductor L7 is connected to the common node of the fourth switching element Q8 and the fifth switching element Q9. The stepped-down mains power refers to the voltage after stepping down and rectifying the 220V voltage.

[0092] In this embodiment, the first chip U15 can be an efficient power management chip for controlling the working state of the battery charging circuit 600. The first chip U15 has multiple protection functions, such as overcurrent protection, overvoltage protection, overheat protection, etc., to ensure the safety and stability of the charging process. The third switching element Q3, the fourth switching element Q8, and the fifth switching element Q9 can be controllable switching devices such as transistors or MOSFETs. They are controlled by the first chip U15 and are respectively used to switch the connection state of the circuit at different stages during the charging process to achieve precise current control and management of the charging process. Components such as the seventh diode D3, the seventh resistor R35, and the eighth resistor R38 are used to protect the first chip U15 and the switching elements to prevent damage caused by overcurrent, overvoltage, etc.

[0093] In this embodiment, the third switching element Q3 and the fourth switching element Q8 are used to achieve current switching and regulation during the charging process. By controlling the on and off of these two switching elements, constant current charging and constant voltage charging of the battery pack 200 can be achieved to meet the charging requirements of different battery packs 200. The fifth switching element Q9 is used to control the access after the mains voltage is stepped down to ensure that the charging circuit can work stably and safely when accessing the mains. By adjusting the on and off of the fifth switching element Q9, the input voltage of the charging circuit can be controlled to adapt to different mains voltage conditions.

[0094] The first inductor L7 plays a role of filtering and energy storage in the circuit. It can smooth the fluctuations of the input voltage, reduce ripple noise, and improve the performance of the charging circuit. In addition, the first inductor L7 can also store a certain amount of energy and release it when needed to support the charging of the battery pack 200. The above circuit structure can achieve efficient and safe charging of the battery pack 200. This design greatly improves the reliability and service life of the emergency lighting lamp, providing a safer and more stable lighting experience for users.

[0095] With reference to Figure 5 shown, further, another embodiment of the present utility model provides a power supply circuit of an emergency lighting lamp. Based on the above Figure 4 shown embodiment, the battery charging circuit 600 includes a charging current detection circuit 610, where:

[0096] The input end of the charging current detection circuit 610 is connected to the input end of the battery pack 200, and the output end of the charging current detection circuit 610 is connected to the third input end of the control circuit 400. The charging current detection circuit 610 is used to monitor the input current during the charging process of the battery pack 200 and output a corresponding current signal.

[0097] In this embodiment, the charging current detection circuit 610 can use a current sensor or other high-precision current detection devices to achieve real-time monitoring of the input current during the charging process of the battery pack 200. The current detection circuit converts the detected current signal into a voltage signal or other signal forms recognizable by the control circuit 400, and then outputs it to the third input terminal of the control circuit 400.

[0098] After receiving the current signal from the charging current detection circuit 610, the control circuit 400 will determine whether the current charging state is normal according to a preset charging current threshold. If the charging current is too large or too small, the control circuit 400 will take corresponding measures, such as adjusting the input voltage of the charging circuit, reducing or increasing the charging current, etc., to ensure that the battery pack 200 is charged in a safe and efficient state, and it can perform adaptive charging management according to the actual situation of the battery pack 200. This can not only improve the charging efficiency, but also avoid safety problems caused by too large or too small charging current, further improving the safety and reliability of the emergency lighting lamp.

[0099] The present utility model also proposes an emergency lighting lamp, which includes a power supply circuit of the emergency lighting lamp. The specific structure of the power supply circuit of the emergency lighting lamp refers to the above embodiment. Since this emergency lighting lamp adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0100] As described above is an implementation manner provided in combination with specific content, and it is not determined that the specific implementation of this application is only limited to these descriptions. Any approximation, similarity to the method, structure, etc. of this application, or several technical deductions or replacements made under the premise of the concept of this application should be regarded as the protection scope of this application.

Claims

1. A power supply circuit for an emergency lighting lamp, characterized in that, Comprising: A mains power detection circuit, the input end of which is connected to the mains power. The mains power detection circuit is used to detect the operating state of the mains power and output a corresponding detection signal; A battery pack; A boost circuit, the input end of which is connected to the output end of the battery pack, and the controlled end of which is connected to the output end of the mains power detection circuit. The boost circuit is used to connect to the power supply of the battery pack and boost it to a preset voltage when the detection signal indicates no mains power; The boost circuit includes: A second switch, the first end of which is connected to the positive pole of the battery pack; A third switch, the first end of which is connected to the second end of the second switch; A first switching element, the input end of which is connected to the second end of the second switch, and a second resistor is connected between the controlled end and the input end of the first switching element; A fifth diode, the positive pole of which is connected to the output end of the first switching element; A sixth diode, and a first capacitor is connected between the negative pole of the sixth diode and the second end of the third switch; A second switching element, the controlled end of which is connected to the negative pole of the sixth diode. A third resistor is connected between the first conducting end of the second switching element and the controlled end of the first switching element. The second conducting end of the second switching element is grounded, and a fourth resistor is connected between the controlled end and the second conducting end of the second switching element; A fifth resistor, a sixth resistor is connected between the first end of the fifth resistor and the output end of the first switching element, the second end of the fifth resistor is grounded, and at least one capacitor is connected in parallel across the two ends of the fifth resistor.

2. The power supply circuit of the emergency lighting lamp according to claim 1, characterized in that, The mains power detection circuit includes: A first terminal; A first switch, a first series resistor group is connected between the first end of the first switch and the first end of the first terminal, and a second series resistor group is connected between the second end of the first switch and the second end of the first terminal; A transformer, the first primary end of which is connected to the third end of the first switch, the second primary end of which is connected to the fourth end of the first switch. A first diode is connected between the first secondary end of the transformer and the ground, a second diode is connected between the second secondary end of the transformer and the ground, and a clamping diode is connected between the first secondary end and the second secondary end of the transformer; A third diode, the positive pole of which is connected to the second secondary end of the transformer, and a first resistor is connected between the third diode and the ground; A fourth diode, the positive pole of which is connected to the first secondary end of the transformer, at least one capacitor is connected between the fourth diode and the ground, and the negative pole of the fourth diode is connected to the negative pole of the third diode.

3. The power supply circuit of the emergency lighting lamp according to claim 1, characterized in that, The voltage amplitude of the battery pack is 9 - 15V.

4. The power supply circuit of the emergency lighting lamp according to any one of claims 1-3, characterized in that, Further comprising: A control circuit, the first input end of which is connected to the output end of the mains power detection circuit, and the first output end of which is connected to the controlled end of the boost circuit. The control circuit is used to output a corresponding control signal to the boost circuit according to the detection signal.

5. The power supply circuit of the emergency lighting lamp according to claim 4, characterized in that, Further comprising: A temperature detection circuit, the output end of the temperature detection circuit is connected to the second input end of the control circuit, and the temperature detection circuit is used to detect the temperature during the charging or discharging process of the battery pack, so as to output a corresponding temperature signal to the control circuit.

6. The power supply circuit of the emergency lighting lamp according to claim 4, characterized in that, It further includes: A battery charging circuit, the controlled end of the battery charging circuit is connected to the second output end of the control circuit, the input end of the battery charging circuit is used to access the stepped-down commercial power, and the output end of the battery charging circuit is connected to the power input end of the battery pack.

7. The power supply circuit of the emergency lighting lamp according to claim 6, characterized in that The battery charging circuit includes: A first chip, the controlled end of the first chip is connected to the second output end of the control circuit, at least one capacitor is connected between the power input end of the first chip and the ground, and a seventh diode is connected between the power input end and the feedback end of the first chip; A third switching element, the controlled end of the third switching element is connected to the first control end of the first chip, and the first conducting end of the third switching element is grounded; A fourth switching element, a seventh resistor is connected between the controlled end of the fourth switching element and the second control end of the first chip, and the controlled end of the fourth switching element is connected to the second conducting end of the third switching element; A fifth switching element, an eighth resistor is connected between the controlled end of the fifth switching element and the third control end of the first chip, the first conducting end of the fifth switching element is connected to the second conducting end of the fourth switching element, at least one capacitor is connected between the second conducting end of the fifth switching element and the ground, and the second conducting end of the fifth switching element is used to access the stepped-down commercial power; A first inductor, the first end of the first inductor is connected to the power input end of the battery pack, the second end of the first inductor is connected to the power output end of the first chip, and the second end of the first inductor is connected to the common node of the fourth switching element and the fifth switching element.

8. The power supply circuit of the emergency lighting lamp according to claim 6, characterized in that, The battery charging circuit includes: A charging current detection circuit, the input end of the charging current detection circuit is connected to the input end of the battery pack, the output end of the charging current detection circuit is connected to the third input end of the control circuit, and the charging current detection circuit is used to monitor the input current during the charging process of the battery pack and output a corresponding current signal.

9. An emergency lighting lamp, characterized in that, The emergency lighting lamp includes the power supply circuit of the emergency lighting lamp according to any one of claims 1 to 8.

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