LED down lamp power supply circuit and LED down lamp

Abstract

The utility model discloses an LED down lamp power supply circuit and an LED down lamp. The power supply circuit comprises an LED drive control module, a constant voltage output module, a battery boost module, a battery, a micro-control unit and an alarm unit. The micro-control unit is used for controlling the working and standby states of the LED driving control circuit and controlling the working and standby states of the battery boosting module according to the working state of the constant-voltage output module; the micro-control unit is provided with a timer, and is also used for triggering the timer to start timing when the battery is connected for power supply, and controlling the alarm unit to give an alarm when the timer reaches a preset time limit, or controlling the LED driving control module to work discontinuously. When the mains supply is abnormal, the battery is used for supplying power to the lamp tube, when the battery is provided with the LED lamp tube and electrifies the micro-control unit, the timer in the micro-control unit starts timing, and when the timer reaches a preset time limit, a user is reminded to time and replace the battery, so that the failure of an emergency function is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of downlights, and in particular to an LED downlight power supply circuit and an LED downlight. Background Art

[0002] An LED downlight is a product developed by improving and developing a traditional downlight by applying a new type of LED lighting source. Compared with the traditional downlight, it has the following advantages: energy saving, low carbon, long life, good color rendering, and fast response speed. The design of the LED downlight is more beautiful and light. When installed, it can maintain the overall unity and perfection of the building decoration, without damaging the setting of the lamp. The light source is hidden inside the building decoration, the light source is not exposed, there is no glare, and the visual effect of people is soft and uniform.

[0003] For an emergency downlight, a battery is installed on it. When the emergency downlight cannot be powered by the mains power, it can be powered by the battery. However, the battery has a service life. If the battery is not replaced in time when its usage time reaches its service life, when an emergency occurs and the battery needs to power the emergency downlight, the battery cannot supply power normally, which poses a safety hazard.

[0004] Therefore, the existing technology still needs to be improved and developed. Summary of the Utility Model

[0005] In view of the above deficiencies of the existing technology, the purpose of the present utility model is to provide an LED downlight power supply circuit and an LED downlight to solve the problem that the existing emergency downlight cannot supply power in time due to the battery not being replaced in time when it reaches the replacement period.

[0006] The technical solution of the present utility model is as follows:

[0007] In the first aspect, the present utility model provides an LED downlight power supply circuit, which includes: an LED drive control module, a constant voltage output module, a battery boost module, a battery, a micro control unit, and an alarm unit; wherein,

[0008] The LED drive control module is used to connect to the mains power to drive the LED light source;

[0009] The constant voltage output module is respectively connected to the battery boost module, the battery, and the micro control unit. The constant voltage output module is used to connect to the mains power, rectify and step down the mains power, and output a first voltage to charge the battery;

[0010] The battery is also respectively connected to the battery boost module and the micro control unit. The battery is used to output a second voltage to supply power to the micro control unit;

[0011] The battery boost module is connected to the battery, and the battery boost module is used to boost the second voltage to a third voltage to drive the LED light source;

[0012] The micro-control unit is respectively connected to the LED drive control module, the constant voltage output module, the boost control module, and the battery. The micro-control unit is used to output a first start signal to the LED drive control module, and is used to output a second start signal to the battery boost module when it detects that the constant voltage output module has no voltage output;

[0013] The micro-control unit has a timer; the micro-control unit is also connected to the alarm unit. The micro-control unit is further used to trigger the timer to start timing when the battery is connected for power supply, and is used to output an alarm signal to the alarm unit for alarm when the timer reaches a preset time limit, or intermittently output the first start signal to the LED drive control module.

[0014] In a further setting of the present utility model, the alarm unit is one or more of an LED indicator light and a buzzer.

[0015] In a further setting of the present utility model, it further includes a test switch. One end of the test switch is connected to the micro-control unit, and the other end of the test switch is grounded.

[0016] In a further setting of the present utility model, it further includes a charging status indicator light, and the charging status indicator light is connected to the micro-control unit.

[0017] In a further setting of the present utility model, it further includes a switch connection interface. One end of the switch connection interface is connected to the battery, and the other end of the switch connection interface is respectively connected to the constant voltage output module and the battery boost module.

[0018] In a further setting of the present utility model, the LED drive control module includes a relay switch, a first switching tube, and an LED drive unit; wherein,

[0019] The relay switch is used to connect to the neutral wire of the mains power supply, and is respectively connected to the drain of the first switching tube and the LED drive unit;

[0020] The LED drive unit is further used to connect to the live wire of the mains power supply to drive the LED light source;

[0021] The gate of the first switching tube is connected to the micro-control unit, and the source of the first switching tube is grounded.

[0022] Further setting of the present utility model, the constant voltage output module includes a rectifier bridge, a constant voltage control chip, a first capacitor, a second capacitor, a third capacitor, a first diode, a second diode, a transformer, a first resistor, a second resistor, a third resistor and a fourth resistor; wherein,

[0023] The rectifier bridge is connected to the mains power supply;

[0024] One end of the first capacitor is connected to the third pin of the rectifier bridge, and the other end of the first capacitor is grounded;

[0025] One end of the first resistor is connected to the anode of the first diode, and the other end of the first resistor is connected to the first pin of the transformer;

[0026] The second capacitor is connected in parallel with the first resistor;

[0027] The cathode of the first diode is connected to the constant voltage control chip;

[0028] The second pin of the transformer is connected to the constant voltage control chip, the third pin of the transformer is connected to the anode of the second diode, and the fourth pin of the transformer is grounded;

[0029] The cathode of the second diode is connected to one end of the third capacitor, and the other end of the third capacitor is grounded;

[0030] The second resistor is connected in parallel with the third capacitor, and the third resistor and the fourth resistor are connected in series and then connected in parallel with the second resistor.

[0031] Further setting of the present utility model, the constant voltage output module further includes a fuse, a varistor, a differential mode inductor and a fourth capacitor; wherein,

[0032] The fuse is used to connect to the live wire of the mains power supply;

[0033] One end of the varistor is used to connect to the neutral wire of the mains power supply, and the other end of the varistor is connected to the fuse;

[0034] The first pin of the differential mode inductor is connected to one end of the varistor, the second pin of the differential mode inductor is connected to the other end of the varistor, the third pin of the differential mode inductor is respectively connected to one end of the fourth capacitor and the second pin of the rectifier bridge, and the fourth pin of the differential mode inductor is respectively connected to the other end of the fourth capacitor and the first pin of the rectifier bridge.

[0035] Further setting of the present utility model, the battery boost module includes a storage inductor, a boost constant current drive chip, a third diode and a fourth diode; wherein,

[0036] One end of the energy storage inductor is connected to the battery, and the other end of the energy storage inductor is connected to the boost constant current drive chip;

[0037] The anode of the third diode is connected to the other end of the energy storage inductor, the cathode of the third diode is connected to the anode of the fourth diode, and the anode of the fourth diode is connected to the LED light source.

[0038] In a second aspect, the present invention further provides an LED downlight, which includes the LED downlight power supply circuit as described above.

[0039] An LED downlight power supply circuit and an LED downlight provided by the present invention. The LED downlight power supply circuit includes: an LED drive control module, a constant voltage output module, a battery boost module, a battery, a micro control unit and an alarm unit. The LED drive control module is used to connect to the mains power to drive the LED light source; the constant voltage output module is used to connect to the mains power, rectify and step down the mains power, and then output a first voltage to charge the battery; the battery is used to output a second voltage to supply power to the micro control unit; the battery boost module is used to boost the second voltage to a third voltage to drive the LED light source; the micro control unit is used to output a first start signal to the LED drive control module, and is also used to output a second start signal to the battery boost module when it detects that the constant voltage output module has no voltage output; the micro control unit has a timer; the micro control unit is also connected to the alarm unit, and the micro control unit is further used to trigger the timer to start timing when the battery is connected for power supply, and is used to output an alarm signal to the alarm unit for alarm when the timer reaches a preset time limit, or intermittently output the first start signal to the LED drive control module. By using a battery to supply power to the downlight when there is no mains power supply for the LED downlight, and when the battery is installed on the LED downlight and powers on the micro control unit, the timer inside the micro control unit starts timing, and can output an alarm signal to the alarm unit for alarm or make the LED drive control module work intermittently when the timer reaches the preset time limit, so as to remind the user to replace the battery in time, thus avoiding potential safety hazards when the battery cannot supply power normally in case of an emergency when the battery is needed to supply power to the emergency downlight. Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention 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 invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0041] Figure 1 It is a schematic block diagram of a power supply circuit for an LED downlight in the present utility model.

[0042] Figure 2 It is a circuit schematic diagram of an LED drive control module, a constant voltage output module, a battery boost module and a battery in the present utility model.

[0043] Figure 3 It is a circuit schematic diagram of a micro control unit in the present utility model.

[0044] Marks in the attached drawings: 100, LED drive control module; 110, LED drive unit; 200, constant voltage output module; 300, battery boost module; 400, battery; 500, micro control unit; 600, alarm unit. Detailed implementation manners

[0045] The present utility model provides a power supply circuit for an LED downlight and an LED downlight. To make the purpose, technical solution and effects of the present utility model clearer and more definite, the following further elaborates on the present utility model with reference to the attached drawings and by way of examples. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0046] In the embodiments and the scope of the patent application, unless otherwise specifically defined in the text for articles, the words "a", "an", "the" and "said" may also include the plural form. If there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. 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", "second" may explicitly or implicitly include at least one of such features.

[0047] It should be further understood that the term "including" used in the description of the present utility model means the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. It should be understood that when an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used here may include wireless connection or wireless coupling. The phrase "and / or" used here includes all or any unit and all combinations of one or more related listed items.

[0048] Those skilled in the art can understand that, unless otherwise defined, all terms used herein (including technical terms and scientific terms) have the same meaning as the general understanding of those of ordinary skill in the field to which this utility model belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless specifically defined as here.

[0049] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0050] Please also refer to Figures 1 to 3 , this utility model provides a preferred embodiment of an LED downlight power supply circuit.

[0051] In some embodiments, such as Figure 1As shown, the utility model provides an LED downlight power supply circuit, which includes: an LED drive control module 100, a constant voltage output module 200, a battery boost module 300, a battery 400, a micro control unit 500 and an alarm unit 600. Among them, the LED drive control module 100 is used to access the mains power to drive the LED light source; the constant voltage output module 200 is respectively connected to the battery boost module 300, the battery 400 and the micro control unit 500, and the constant voltage output module 200 is used to access the mains power, rectify and step down the mains power and then output a first voltage to charge the battery 400; the battery 400 is also respectively connected to the battery boost module 300 and the micro control unit 500, and the battery 400 is used to output a second voltage to supply power to the micro control unit 500; the battery boost module 300 is connected to the battery 400, and the battery boost module 300 is used to boost the second voltage to a third voltage to drive the LED light source; the micro control unit 500 is respectively connected to the LED drive control module 100, the constant voltage output module 200, the boost control module and the battery 400, and the micro control unit 500 is used to output a first start signal to the LED drive control module 100, and is used to output a second start signal to the battery boost module 300 when it detects that the constant voltage output module 200 has no voltage output; the micro control unit 500 has a timer; the micro control unit 500 is also connected to the alarm unit 600, and the micro control unit 500 is further used to trigger the timer to start timing when the battery 400 is connected for power supply, and is used to output an alarm signal to the alarm unit 600 for alarm when the timer reaches a preset time limit, or intermittently output the first start signal to the LED drive control module 100.

[0052] In this embodiment, when the LED lamp tube is connected to the mains AC, the micro control unit 500 outputs a first start signal to the LED drive control module 100 to drive the LED drive control module 100 to work (when the LED drive control module is connected to the first start signal, it is in the working state, and when the LED drive control module is not connected to the first start signal, it is in the standby state). The mains drives the LED light source through the LED drive control module 100. The constant voltage output module 200 rectifies and steps down the connected mains and outputs a first voltage to charge the battery 400. The micro control unit 500 can detect the voltage output state of the constant voltage output module 200. When the micro control unit 500 detects that the constant voltage output module 200 has a voltage output, it indicates that the mains is in a normal state, and the micro control unit 500 outputs a first start signal to the LED drive control module 100; when the micro control unit 500 cannot detect that the constant voltage output module 200 has a voltage output, it indicates that the mains is abnormal. The LED drive control module 100 loses power and has no output. The micro control unit 500 will control the LED drive control module 100 to disconnect and simultaneously output a second start signal to start the battery boost module 300 (when the battery boost module is connected to the second start signal, it is in the working state, and when the battery boost module is not connected to the second start signal, it is in the standby state), so as to boost the second voltage (such as 3.7V) output by the battery 400 to a third voltage through the battery boost module 300 and then drive the LED light source to realize the emergency lighting function.

[0053] Wherein, after the battery 400 is installed in the LED lamp tube and the micro control unit 500 is powered on, the timer inside the micro control unit 500 starts timing. When the timing of the timer reaches the preset time limit, the micro control unit 500 can intermittently output the first start signal to the LED drive control module 100 to make the LED drive control module 100 work intermittently. For example, the LED drive control module 100 is controlled to disconnect once every 10 seconds, so that the LED light source flashes to prompt the user to replace the battery 400. In addition, when the service life of the battery 400 reaches the preset time limit, an alarm device can also be used to give an alarm to prompt the user to replace the battery 400. In one implementation, the service life of the battery 400 can be set to 2 years, and the specific duration can be adjusted according to the actual situation.

[0054] It can be seen that the utility model can realize the emergency lighting function by using the battery 400 to supply power to the lamp tube when there is no mains power supply for the LED lamp tube. Moreover, when the battery 400 is installed on the LED lamp tube to power on the micro-control unit 500, the timer inside the micro-control unit 500 starts timing, and can output an alarm signal to the alarm unit 600 for alarming or intermittently output the first start signal when the timer reaches the preset time limit, so that the LED drive control module 100 works intermittently, to remind the user to replace the battery 400 in time. Thus, it can avoid the safety hazard that the battery 400 cannot supply power normally when an emergency occurs and the battery 400 needs to supply power to the emergency downlight, and prevent the emergency function from failing due to the battery 400 life problem.

[0055] In some embodiments, such as Figure 1 shown, the alarm unit 600 is one or more of an LED indicator light and a buzzer.

[0056] In this embodiment, when the battery 400 reaches the service life, in addition to making the LED drive control module 100 work intermittently to make the LED light source flash to remind the user to replace the battery 400, an alarm can also be given by the connected alarm unit 600. The alarm unit 600 can be, but is not limited to, an LED indicator light and a buzzer. When the timing time of the timer reaches, the micro-control unit 500 triggers an interrupt and can output an alarm signal to drive the LED indicator light or the buzzer to give an alarm, so as to remind the user that the battery 400 has reached the service life and a new battery 400 needs to be replaced.

[0057] In some embodiments, such as Figure 3 shown, the LED downlight power supply circuit further includes a test switch SW, one end of the test switch SW is connected to the micro-control unit 500, and the other end of the test switch SW is grounded.

[0058] Specifically, the test switch SW is a test button, and the test switch SW is connected to the micro-control unit 500. When the mains power supply is normal, the emergency function can be tested through the test switch SW to check whether the emergency function of the LED lamp tube can be used normally. Specifically, after the test switch SW is pressed, the micro-control unit 500 will first control the LED drive control module 100 not to work, and output a second start signal to the battery boost module 300 to enter the emergency lighting mode, and the battery 400 supplies power. If the LED light source is lit, it means that the emergency function is normal, and the test mode is exited after the key switch is reset.

[0059] In some embodiments, such as Figure 3As shown, the LED downlight power supply circuit further includes a charging status indicator LED1, and the charging status indicator LED1 is connected to the micro control unit 500.

[0060] In this embodiment, the charging status indicator LED1 is connected to the micro control unit 500, and can display the charging status of the battery 400. When the battery 400 is in the charging state, the charging status indicator LED1 blinks. When the battery 400 is fully charged, the charging status indicator LED1 is constantly on.

[0061] In some embodiments, as Figure 3 shown, the test switch SW and the charging status indicator LED1 are both connected to the 3rd pin of the micro control unit 500. The 3rd pin of the micro control unit 500 can output a high-level circuit to the charging status indicator LED1, and can also detect the on / off state of the test switch SW.

[0062] In some embodiments, as Figure 2 shown, the LED downlight power supply circuit further includes a switch connection interface BSW. One end of the switch connection interface BSW is connected to the battery 400, and the other end of the switch connection interface BSW is respectively connected to the constant voltage output module 200 and the battery boost module 300.

[0063] In this embodiment, the battery 400 is connected to the micro control unit 500 and the battery boost module 300 through the switch connection interface BSW. In this way, disconnecting the battery 400 before installing the LED lamp tube can protect the battery 400, reduce the loss of the battery 400 during the storage and transportation of the lamp, and facilitate the replacement of the battery 400 after its service life expires. Compared with the conventional products on the market that need to replace the emergency power supply as a whole, the maintenance cost is reduced. And when the battery 400 is disconnected from the switch connection interface BSW, the LED lamp tube can be used as an ordinary lamp, and when the switch connection interface is closed, the LED lamp tube can be used as an emergency lamp.

[0064] In some embodiments, as Figure 2 shown, the LED drive control module 100 includes a relay switch Relay, a first switching tube Q1 and an LED drive unit 110. Among them, the relay switch Relay is used to connect to the neutral line N of the mains, and is respectively connected to the drain of the first switching tube Q1 and the LED drive unit 110; the LED drive unit 110 is also used to connect to the live wire L of the mains to drive the LED light source; the gate of the first switching tube Q1 is connected to the micro control unit 500, and the source of the first switching tube Q1 is grounded.

[0065] In this embodiment, the relay switch Relay can control the on / off of the mains power to turn on or off the LED lamp tube. The independent control of the relay switch Relay does not affect functions such as TRIAC dimming, 0-10V dimming, remote control, and wall switch of the lamp, and can be adapted to different types of LED drivers as needed, with strong compatibility. The 8th pin of the micro-control unit 500 is connected to the gate of the first switching transistor Q1, and can output a first pulse width modulation signal PWM1 (i.e., the first startup signal) to control the conduction and cutoff of the first switching transistor Q1, thereby further controlling the attraction and disconnection of the relay switch Relay, and finally realizing the switching control of the operation and standby of the LED drive control module 100. It should be noted that the LED drive unit 110 is a structure of an existing circuit unit, so it will not be elaborated here.

[0066] In some embodiments, as Figure 2 shown, the constant voltage output module 200 includes a rectifier bridge BD, a constant voltage control chip U1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first diode D1, a second diode D2, a transformer T, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. Among them, the rectifier bridge BD is connected to the mains power; one end of the first capacitor C1 is connected to the third pin (i.e., the 3rd pin) of the rectifier bridge BD, and the other end of the first capacitor C1 is grounded; one end of the first resistor R1 is connected to the anode of the first diode D1, and the other end of the first resistor R1 is connected to the first pin (i.e., the 1st pin) of the transformer T; the second capacitor C2 is connected in parallel with the first resistor R1; the cathode of the first diode D1 is connected to the constant voltage control chip U1; the second pin (i.e., the 2nd pin) of the transformer T is connected to the constant voltage control chip U1, the third pin of the transformer T is connected to the anode of the second diode D2, and the fourth pin (i.e., the 4th pin) of the transformer T is grounded; the cathode of the second diode D2 is connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is grounded; the second resistor R2 is connected in parallel with the third capacitor C3, and the third resistor R3 and the fourth resistor R4 are connected in series and then connected in parallel with the second resistor R2.

[0067] In this embodiment, the rectifier bridge BD is a full-bridge rectifier, and the rectifier bridge BD can rectify the input AC mains. The constant voltage control chip U1 is a PWM constant voltage control chip, which is an AC / DC power control chip with an internal MOS transistor. The internal digital logic control module can control the on and off times of the primary winding of the transformer according to the output voltage feedback signal. When it is on, the primary winding stores energy. When it is off, the second diode D2 conducts, and the energy stored in the primary winding of the transformer can be coupled and transferred to the output terminal. The constant voltage control chip U1 can control the magnitude of the DC voltage at the output terminal of the constant voltage output module 200. In one implementation, the constant voltage control chip U1 can control the output terminal of the constant voltage output module 200 to output a DC voltage of 5V.

[0068] Wherein, the output terminal of the constant voltage output module 200 is connected to the second pin of the micro-control unit 500. The micro-control unit 500 can detect whether there is a voltage output at the output terminal of the constant voltage output module 200. By detecting the voltage at the output terminal of the constant voltage output module 200, it is possible to know whether the current mains is normal, and thus it is possible to determine whether it is necessary to activate the emergency lighting function.

[0069] Furthermore, as Figure 2 shown, the constant voltage output module 200 further includes a fuse FS1, a varistor VR1, a differential-mode inductor Ld, and a fourth capacitor C4. Among them, the fuse FS1 is used to connect to the live wire L of the mains; one end of the varistor VR1 is used to connect to the neutral wire N of the mains, and the other end of the varistor VR1 is connected to the fuse FS1; the first pin (i.e., the first pin) of the differential-mode inductor Ld is connected to one end of the varistor VR1, the second pin (i.e., the second pin) of the differential-mode inductor Ld is connected to the other end of the varistor VR1, the third pin (i.e., the third pin) of the differential-mode inductor Ld is respectively connected to one end of the fourth capacitor C4 and the second pin of the rectifier bridge BD, and the fourth pin (i.e., the fourth pin) of the differential-mode inductor Ld is respectively connected to the other end of the fourth capacitor C4 and the first pin of the rectifier bridge BD.

[0070] In this embodiment, the fuse FS1 can break when the input alternating current is too large to protect the LED lamp tube. The varistor VR1 can prevent surges to protect the subsequent circuit from being damaged by spikes. The differential-mode inductor Ld can suppress the differential-mode interference between the live wire and the neutral wire.

[0071] In some embodiments, as Figure 2As shown in the figure, the battery boost module 300 includes a storage inductor L1, a boost constant current drive chip U2, a third diode D3, and a fourth diode D4. Among them, one end of the storage inductor L1 is connected to the battery 400, and the other end of the storage inductor L1 is connected to the boost constant current drive chip U2; the anode of the third diode D3 is connected to the other end of the storage inductor L1, the cathode of the third diode D3 is connected to the anode of the fourth diode D4, and the anode of the fourth diode D4 is connected to the LED light source.

[0072] In this embodiment, the boost constant current drive chip U2 integrates a voltage reference, an operational amplifier, and a current comparator inside. By setting external components, a constant output current can be obtained, so that the brightness of the LED lamp tube can be set. The storage inductor L1 is connected to the switching pin (i.e., pin 1) of the boost constant current drive chip U2. The boost constant current drive chip U2 can control the timing of the storage inductor L1 to conduct or turn off through an internal MOS transistor, and boost the output voltage of the battery 400 to a third voltage to drive the LED light source. Among them, the third diode D3 is a freewheeling diode, and the fourth diode D4 can prevent the LED drive current from flowing back. Among them, the enable pin (i.e., pin 6) of the boost constant current drive chip U2 is connected to the 7th pin of the micro control unit 500. The micro control unit 500 can output a second pulse width modulation signal PWM2 (i.e., a second start signal) to control the working state of the boost constant current drive chip U2, that is, to be in a working or standby state.

[0073] In some embodiments, the present invention also provides an LED downlight, which includes the LED downlight power supply circuit as described above. Specifically, as described in an LED lamp tube power supply circuit, it will not be elaborated here.

[0074] To sum up, an LED downlight power supply circuit and an LED downlight provided by the present invention have the following beneficial effects:

[0075] When there is no mains power supply for the LED downlight, the battery is used to supply power to the downlight, realizing the emergency lighting function;

[0076] When the battery is installed on the LED downlight and powers on the micro control unit, the timer inside the micro control unit starts timing, and can control the alarm unit to alarm or control the LED drive control module to work intermittently when the timer reaches the preset time limit, so as to remind the user to replace the battery in time, thus avoiding potential safety hazards when the battery cannot supply power normally when an emergency occurs and the battery is required to supply power to the emergency downlight;

[0077] The battery is connected to the micro-control unit and the battery boost module through the switch connection interface. In this way, disconnecting the connection before installing the LED lamp tube can protect the battery, reduce battery loss during the storage and transportation of the lamp, and facilitate the replacement of the battery when its life expires. Compared with the conventional products on the market that require the overall replacement of the emergency power supply, the maintenance cost is reduced. Moreover, when the battery is disconnected from the switch connection interface, the LED lamp tube can be used as an ordinary lamp, and when the switch connection interface is closed, the LED lamp tube can be used as an emergency lamp.

[0078] It should be understood that the application of the present utility model is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations shall fall within the protection scope of the appended claims of the present utility model.

Claims

1. An LED downlight power supply circuit, characterized in that Including: LED drive control module, constant voltage output module, battery boost module, battery, micro control unit and alarm unit; among them, The LED drive control module is used to connect to the mains power to drive the LED light source; The constant voltage output module is respectively connected to the battery boost module, the battery and the micro control unit. The constant voltage output module is used to connect to the mains power, rectify and step down the mains power, and then output a first voltage to charge the battery; The battery is also respectively connected to the battery boost module and the micro control unit. The battery is used to output a second voltage to supply power to the micro control unit; The battery boost module is connected to the battery. The battery boost module is used to boost the second voltage to a third voltage to drive the LED light source; The micro control unit is respectively connected to the LED drive control module, the constant voltage output module, the battery boost module and the battery. The micro control unit is used to output a first start signal to the LED drive control module, and is used to output a second start signal to the battery boost module when it detects that the constant voltage output module has no voltage output; The micro control unit has a timer; the micro control unit is also connected to the alarm unit. The micro control unit is also used to trigger the timer to start timing when the battery is connected for power supply, and is used to output an alarm signal to the alarm unit for alarm when the timer reaches a preset time limit, or intermittently output the first start signal to the LED drive control module.

2. The LED downlight power supply circuit according to claim 1, characterized in that The alarm unit is one or more of an LED indicator light and a buzzer.

3. The LED downlight power supply circuit according to claim 1, characterized in that, It also includes a test switch. One end of the test switch is connected to the micro control unit, and the other end of the test switch is grounded.

4. The LED downlight power supply circuit according to claim 1, wherein It also includes a charging status indicator light, and the charging status indicator light is connected to the micro control unit.

5. The LED downlight power supply circuit according to claim 1, characterized in that, It also includes a switch connection interface. One end of the switch connection interface is connected to the battery, and the other end of the switch connection interface is respectively connected to the constant voltage output module and the battery boost module.

6. The LED downlight power supply circuit according to claim 1, wherein The LED drive control module includes a relay switch, a first switching tube and an LED drive unit; among them, The relay switch is used to connect to the neutral wire of the mains power, and is respectively connected to the drain of the first switching tube and the LED drive unit; The LED drive unit is also used to connect to the live wire of the mains power to drive the LED light source; The gate of the first switching tube is connected to the micro control unit, and the source of the first switching tube is grounded.

7. The LED downlight power supply circuit according to claim 1, wherein The constant voltage output module includes a rectifier bridge, a constant voltage control chip, a first capacitor, a second capacitor, a third capacitor, a first diode, a second diode, a transformer, a first resistor, a second resistor, a third resistor and a fourth resistor; among them, The rectifier bridge connects to the mains power; One end of the first capacitor is connected to the third pin of the rectifier bridge, and the other end of the first capacitor is grounded; One end of the first resistor is connected to the anode of the first diode, and the other end of the first resistor is connected to the first pin of the transformer; The second capacitor is connected in parallel with the first resistor; The cathode of the first diode is connected to the constant voltage control chip; The second pin of the transformer is connected to the constant voltage control chip, the third pin of the transformer is connected to the anode of the second diode, and the fourth pin of the transformer is grounded; The cathode of the second diode is connected to one end of the third capacitor, and the other end of the third capacitor is grounded; The second resistor is connected in parallel with the third capacitor, and the third resistor and the fourth resistor are connected in series and then connected in parallel with the second resistor.

8. The LED downlight power supply circuit according to claim 7, wherein, The constant voltage output module further includes a fuse, a varistor, a differential mode inductor and a fourth capacitor; wherein, The fuse is used to be connected to the live wire of the mains; One end of the varistor is used to be connected to the neutral wire of the mains, and the other end of the varistor is connected to the fuse; The first pin of the differential mode inductor is connected to one end of the varistor, the second pin of the differential mode inductor is connected to the other end of the varistor, the third pin of the differential mode inductor is respectively connected to one end of the fourth capacitor and the second pin of the rectifier bridge, and the fourth pin of the differential mode inductor is respectively connected to the other end of the fourth capacitor and the first pin of the rectifier bridge.

9. The LED downlight power supply circuit according to claim 1, characterized in that, The battery boost module includes a storage inductor, a boost constant current drive chip, a third diode and a fourth diode; wherein, One end of the storage inductor is connected to the battery, and the other end of the storage inductor is connected to the boost constant current drive chip; The anode of the third diode is connected to the other end of the storage inductor, the cathode of the third diode is connected to the anode of the fourth diode, and the anode of the fourth diode is connected to the LED light source.

10. An LED downlight, characterized in that, It includes the LED downlight power supply circuit according to any one of claims 1-9.

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