Lamp tube circuit supporting switching between emergency lighting and common lighting

Abstract

The utility model discloses a lamp tube circuit supporting switching between emergency lighting and common lighting, which comprises a master control module, one end of the master control module is respectively connected with a mains supply and a battery, and the other end of the master control module is connected with a light-emitting element; the main control module is used for judging whether the input voltage of the mains supply meets expected driving, and if yes, the light-emitting element is controlled to be started in a common lighting mode; if not, the battery is used as a driving power supply to enable the light-emitting element to be started in an emergency lighting mode; logic judgment is achieved through the main control module, and the main control module controls the light-emitting element to work in a common lighting mode under the condition that the mains supply is normally supplied; and under the condition that the mains supply is disconnected, the main control module is linked with the battery to supply power to the lamp tube when the mains supply cannot supply power normally, so that emergency lighting is realized, and convenience is brought to a user.

Description

Technical Field

[0001] The utility model relates to the field of lighting circuits, in particular to a lamp tube circuit that supports the switching between emergency lighting and normal lighting. Background Art

[0002] An LED lamp tube, that is, a light-emitting diode lamp tube, is a lighting device that uses light-emitting diodes (LEDs) as light sources. Compared with traditional fluorescent lamp tubes, LED lamp tubes have many advantages, including higher energy efficiency, longer service life, faster response time, and lower maintenance costs.

[0003] The existing functional circuit carried by the LED lamp tube is only one, that is, using the mains voltage as the power supply to make the LED components emit light for lighting; it is found in actual use that once a power outage occurs, the LED lamp tube cannot be used emergently. It can be seen that the circuit function carried by the LED lamp in the prior art is relatively single, and the user experience is relatively inconvenient. Therefore, a more reasonable solution is urgently needed to solve the above-mentioned technical problems. Summary of the Utility Model

[0004] Aiming at the technical problem in the prior art that the LED lamp tube only supports the mains power supply as the starting power source, and once a power outage occurs, the LED lamp tube cannot be used emergently, the utility model provides a solution.

[0005] To achieve the above object, the utility model provides a lamp tube circuit that supports the switching between emergency lighting and normal lighting, including a main control module. One end of the main control module is respectively connected to the mains and the battery, and the other end is connected to the light-emitting element;

[0006] The main control module is used to judge whether the input voltage of the mains meets the expected drive. If so, it controls the light-emitting element to start in the normal lighting mode;

[0007] If not, the battery is used as the drive power source to make the light-emitting element start in the emergency lighting mode.

[0008] Wherein, a rectification module is further included between the main control module and the mains. The rectification module is used to convert the voltage of the mains into the drive voltage required to adapt to the light-emitting element.

[0009] Wherein, the main control module includes a main control chip, the rectification module includes a transformer and a voltage transformation chip. The output end of the mains and the adjustment pin of the voltage transformation chip are commonly connected to the first transformer coil T1A of the transformer, and the second transformer coil of the transformer is coupled to the first drive control pin of the main control chip.

[0010] Among them, it also includes a first field-effect transistor. The source electrode of the first field-effect transistor is coupled to the second transformer coil T2E of the transformer, the gate electrode is connected to the first drive control pin, and the drain electrode is sequentially connected to a first inductor and the battery.

[0011] Among them, it also includes a second inductor and a first MOS transistor. One end of the second inductor is coupled to the second transformer coil T2E of the transformer, the other end is connected to the drain electrode of the first MOS transistor. The source electrode of the first MOS transistor is coupled to SGND, and the gate electrode is coupled to the second drive control pin of the main control chip.

[0012] Among them, it also includes a first triode and a second triode located between the second drive control pin and the first MOS transistor. The base electrodes of the first triode and the second triode are commonly connected to the second drive control pin. The emitter electrodes of the first triode and the second triode are commonly connected to the gate electrode of the first MOS transistor. The collector electrode of the first triode is coupled to VDD, and the collector electrode of the second triode is coupled to SGND.

[0013] Among them, it also includes a second MOS transistor and a third MOS transistor. The source electrodes of the second MOS transistor and the third MOS transistor are commonly coupled to the drain electrode of the first MOS transistor. The drain electrode of the second MOS transistor is coupled to the first electrode, and the gate electrode is coupled to the first dimming pin of the main control chip. The drain electrode of the third MOS transistor is coupled to the second electrode, and the gate electrode is coupled to the second dimming pin of the main control chip.

[0014] Among them, it also includes that the linkage control pin of the secondary control chip U3 is coupled to the cooperative control pin of the main control chip. The input end of the secondary control chip U3 is connected to multiple keys, and the output end is connected to the light-emitting element.

[0015] Among them, it also includes a circuit breaker. One end of the circuit breaker is coupled to the mains electricity, and the other end is coupled to a first optical relay. The second transformer coil of the transformer is coupled to a second optical relay, and the first optical relay and the second optical relay are connected in a matching manner.

[0016] Among them, it also includes a power protection module coupled to the battery. The power protection module is used to detect the power value of the battery. When the power value is lower than a preset threshold, the battery is in a disconnected state from the main control chip.

[0017] The beneficial effects of the present utility model are as follows: Compared with the prior art, a lamp tube circuit provided by the present utility model that supports the switching between emergency lighting and normal lighting includes a main control module. One end of the main control module is respectively connected to the mains power and the battery, and the other end is connected to the light-emitting element. The main control module is used to determine whether the input voltage of the mains power meets the expected driving requirement. If so, it controls the light-emitting element to start in the normal lighting mode; if not, it uses the battery as the driving power source to enable the light-emitting element to start in the emergency lighting mode. Through the logical judgment of the main control module, when the mains power is normally supplied, the main control module controls the light-emitting element to work in the normal lighting mode; when the mains power is disconnected, the main control module activates the battery to supply power to the lamp tube when the mains power cannot be normally supplied, thereby realizing emergency lighting and facilitating user use. Description of the Drawings

[0018] Figure 1 It is the circuit diagram of the main control chip of the present utility model;

[0019] Figure 2 It is the circuit diagram of the rectification module of the present utility model;

[0020] Figure 3 It is for the present utility model Figure 2 Partial enlarged view of area A;

[0021] Figure 4 It is for the present utility model Figure 2 Partial enlarged view of area B;

[0022] Figure 5 It is the circuit diagram of the circuit breaker of the present utility model;

[0023] Figure 6 It is the circuit diagram of the power detection module of the present utility model;

[0024] Figure 7 It is the circuit diagram of the secondary control chip U3 of the present utility model;

[0025] Figure 8 It is the framework diagram of the present utility model. Detailed Embodiments

[0026] In order to describe the present utility model more clearly, the present utility model will be further described below with reference to the accompanying drawings.

[0027] In the following description, specific details of the examples are given to provide a deeper understanding of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. It should be understood that the specific embodiments are only used to explain the present utility model and are not used to limit the present utility model.

[0028] It should be understood that when the terms "include" and / or "comprises" are used in this specification, they indicate the existence of the stated features, integers, steps, operations, elements or components, but do not exclude the existence or addition of one or more other features, integers, steps, operations, elements, components or combinations thereof.

[0029] In order to solve the above technical problems, the present application provides a lamp circuit that supports the switching between emergency lighting and ordinary lighting. Figure 1 To Attachment Figure 8 , including a main control module, one end of which is connected to the mains and the battery respectively, and the other end is connected to the light emitting element;

[0030] The main control module is used to determine whether the input voltage of the mains meets the expected driving conditions. If so, the light-emitting element is controlled to start in the normal lighting mode.

[0031] If not, the battery is used as a driving power source to start the light emitting element in the emergency lighting mode.

[0032] It is understandable that the power of the light in emergency lighting mode and normal lighting mode is different. For example, in normal lighting mode, the power of the light is 100% load power. In emergency lighting mode, because it is driven by batteries, the battery power is effective and can maintain a longer supply time, so the light power is 30-50% load power to work, which can be suitable for power outage scenarios. It can be seen that the main control module realizes logical judgment. When the mains power is normally supplied, the main control module controls the light-emitting element to work in normal lighting mode. When the mains power is disconnected, the main control module connects the battery to power the lamp when the mains power cannot be supplied normally, thereby realizing emergency lighting and facilitating user use.

[0033] In one embodiment, a rectifier module is also included between the main control module and the AC power, and the rectifier module is used to convert the voltage of the AC power into the required driving voltage suitable for the light-emitting element; it is not difficult to understand that the voltage of AC power in different countries is different. In order to adapt to AC power of different specifications, the voltage of the AC power is adjusted by the rectifier module and then supplied to the light-emitting element through the circuit, so that the light-emitting element obtains a suitable driving voltage for driving.

[0034] For specific plans, please refer to the attached Figures 1-4 The main control module includes the main control chip U2, the model of the main control chip U2 is 0230B3TV / TSSOP28, the rectifier module includes the transformer and the transformer chip U1, the model of the transformer chip U1 is SY5018BFAC, the output end of the AC power supply and the adjustment pin of the transformer chip U1 (corresponding to the attached Figure 3The 3rd pin in ) is commonly connected to the first transformer coil T1A of the transformer, and the second transformer coil of the transformer is coupled to the first drive control pin of the main control chip U2 (corresponding to the Figure 1 5th pin in the attachment); the transformer chip U1 cooperates with the transformer so that the voltage parameters of the mains power can be converted into appropriate voltage parameters, and then accurately drive the light-emitting element to work under the control of the main control chip U2.

[0035] Specifically, in the emergency drive circuit solution, it also includes a first field-effect transistor Q11. The source of the first field-effect transistor Q11 is coupled to the second transformer coil T2E of the transformer, the gate is connected to the first drive control pin, and the drain is sequentially connected with a first inductor L3, a first diode D11 and a battery; it is not difficult to understand that the main control chip collects the capacity of the battery. When the required battery power is lower than the set preset, the main control chip sends a charging signal command, which activates the switching triode Q13 connected to the first field-effect transistor Q11, and also activates the first field-effect transistor Q11 by the way, so that a charging current of the second transformer T2 flows unidirectionally into the battery, thereby realizing charging the battery; in actual work, it can be understood that the main control chip outputs a corresponding PWM signal to transmit to the switching triode Q13, and the switching triode Q13 then controls the subsequent first field-effect transistor Q11 to work, realizing the connection of the charging circuit, so that the mains power leaks to the battery, and then charges the battery, while the first diode D11 maintains the unidirectionality of the leakage current.

[0036] In actual use, it is found that the battery needs to consider transportation and the volume of the overall lamp tube, and it is difficult to directly adopt a high-voltage output type. Therefore, in this embodiment, it also includes a second inductor L2 and a first MOS transistor Q4. One end of the second inductor L2 is commonly coupled to the second transformer coil T2E of the transformer and a branch of the battery, and the other end is connected to the drain of the first MOS transistor Q4. The source of the first MOS transistor Q4 is coupled to SGND, and the gate is coupled to the second drive control pin of the main control chip U2 (corresponding to the Figure 1 9th pin in the attachment); it is not difficult to understand that a rising circuit is formed through the first MOS transistor Q4 to obtain the expected voltage value and then drive the light-emitting element, and finally realize the drive of the light-emitting element.

[0037] In a further solution, it further includes a first triode Q3 and a second triode Q7 located between the second drive control pin and the first MOS transistor Q4. The bases of the first triode Q3 and the second triode Q7 are commonly connected to the second drive control pin. The emitters of the first triode Q3 and the second triode Q7 are commonly connected to the gate of the first MOS transistor Q4. The collector of the first triode Q3 is coupled to VDD, and the collector of the second triode Q7 is coupled to SGND. It is not difficult to understand that through the above circuit arrangement, the first triode Q3 and the second triode Q7 can quickly drive the first MOS transistor Q4 to work, so as to quickly generate a suitable working voltage to drive the light-emitting element.

[0038] In this embodiment, it further includes a second MOS transistor Q8 and a third MOS transistor Q9. The sources of the second MOS transistor Q8 and the third MOS transistor Q9 are commonly coupled to the drain of the first MOS transistor Q4. The drain of the second MOS transistor Q8 is coupled to the first electrode C-, and the gate is coupled to the first dimming pin of the main control chip U2 (corresponding to Figure 1 pin 1 in the attachment). The drain of the third MOS transistor Q9 is coupled to the second electrode W-, and the gate is coupled to the second dimming pin of the main control chip U2 (corresponding to Figure 1 pin 28 in the attachment). It can be understood that the polarities of the wiring electrodes of the lamp tube carrying this application are of the type of two negative electrodes and one positive electrode. By controlling the running time of the second MOS transistor Q8 and the third MOS transistor Q9 through PWM technology, and then according to the on-off conditions of the second MOS transistor Q8 and the third MOS transistor Q9, the color temperature of the light can be adjusted, such as realizing working modes such as positive white light, warm white light or warm yellow light, so that users can obtain more diverse usage modes.

[0039] During overall emergency lighting, the operating conditions of the electronic components are as follows: Since the mains power cannot be supplied, at this time, the circuit path that can provide voltage is the battery branch connected to the second inductor L2. A fifth MOS transistor Q2 is connected in the battery branch. The fifth MOS transistor Q2 is activated so that the subsequent circuit parts can be correspondingly activated. The second drive control pin of the main control chip outputs a corresponding start-up level to start the first MOS transistor Q4. The first MOS transistor Q4 is quickly pulled up in electrical parameters under the push-pull of the first transistor Q3 and the second transistor Q7. It can be understood that a pull-up circuit is formed to pull the first MOS transistor Q4, and then an expected voltage can be output to drive the light-emitting element. At this time, the power of the light-emitting element is 30-50% of the rated power to maintain a longer lighting duration; based on the light-emitting element, the color temperature of the light-emitting element can be achieved by adjusting the duty cycle of the second drive control pin of the main control chip and cooperating with the second MOS Q8 and the third MOS Q9. Under normal lighting, the second transformer coil T2 of the transformer forms a suitable voltage to activate the fourth MOS transistor Q1. The fourth MOS transistor Q1 is activated, and then the first MOS transistor Q4 quickly pulls up in electrical parameters through the first transistor Q3 and the second transistor Q7, thereby realizing lighting. At this time, the power of the light-emitting element is 100% of the rated power to ensure normal use by users. Based on the light-emitting element, the color temperature of the light-emitting element can be achieved by adjusting the duty cycle of the second drive control pin of the main control chip and cooperating with the second MOS Q8 and the third MOS Q9.

[0040] In this embodiment, a secondary control chip U3 is further included. The model of the secondary control chip is G001 / TSSOP20. The linkage control pin of the secondary control chip U3 (corresponding to the 4th pin in the attachment Figure 7 is coupled to the cooperative control pin of the main control chip U2 (corresponding to the 26th pin in the attachment Figure 1 . The input end of the secondary control chip U3 is connected to multiple buttons, and the output end is connected to the light-emitting element; since the lighting structure generally maintains this strip structure, all wiring is connected through the main control chip U2, and then the buttons are led out to the lighting housing. For technicians, wiring is rather cumbersome and difficult; therefore, from a structural level, the column control board equipped with the main control chip U2 and the secondary control chip U3 equipped with the secondary control chip U3 are respectively placed at both ends of the light-emitting unit. The main control chip and the secondary control chip U3 are electrically connected. By connecting multiple buttons to the secondary control chip U3, the layout of the buttons is reasonably optimized, which can effectively reduce the assembly pressure on technicians and improve the assembly performance; the main functions of the buttons can be color temperature adjustment, power setting, or emergency test, etc.

[0041] In this embodiment, a circuit breaker BR2 is also included, one end of the circuit breaker BR2 is coupled to the mains, and the other end is coupled to the first photorelay OP2A; the second transformer coil of the transformer is coupled to the second photorelay OP2B, and the first photorelay OP2A and the second photorelay OP2B are matched and connected; in actual applications, when the mains cannot be supplied, there is sufficient light and there is no need to adopt the emergency lighting mode. The emergency function is turned on and off by the circuit breaker BR2. When the circuit breaker is in a closed state, the first photorelay sends corresponding matching information to enable the second photorelay to work, thereby controlling the first field effect transistor Q11 and the first MOS tube in the emergency mode circuit to work; when the circuit breaker is in an open state, the emergency lighting mode is turned off, and the light-emitting element is directly turned on and off in combination with the wall switch.

[0042] In this embodiment, a power protection module is also included, the two ends of which are respectively coupled to the main control chip U2 and the battery. The power protection module is used to detect the power value of the battery. When the power value is lower than a preset threshold, the battery and the main control chip U2 are disconnected. In a specific solution, the power protection module includes a third transistor Q17, the base of the third transistor Q17 is connected to the voltage detection pin of the main control chip U2 (corresponding to the attached Figure 1 The emitter is coupled to SGND, the collector is coupled to the base and emitter of the fourth transistor Q15 and then connected to the battery, and the collector of the fourth transistor Q15 is coupled to VBAT++. Specifically, after the main control chip U2 detects the capacity of the battery, if it is found that the battery power has reached the power-deficient threshold, the main control chip controls the third transistor Q17 to control the on and off of the fourth transistor Q15, that is, the battery can be completely disconnected to prevent the battery from continuing to lose power and causing battery failure.

[0043] The advantages of the utility model are:

[0044] 1. The main control module realizes logical judgment. When the mains power is normally supplied, the main control module controls the light-emitting element to work in the normal lighting mode. When the mains power is disconnected, the main control module connects the battery to supply power to the lamp when the mains power cannot be supplied normally, thereby realizing emergency lighting and facilitating user use.

[0045] 2. The running time of the second MOS tube and the third MOS tube is controlled by PWM technology, and the color temperature of the light is adjusted according to the on-off status of the second MOS tube and the third MOS tube, such as realizing working modes such as pure white light, warm white light or warm yellow light, so that users can obtain more diverse usage modes.

[0046] The above are only several specific embodiments of the present utility model disclosed, but the present utility model is not limited thereto, and any changes that can be conceived by those skilled in the art shall fall within the protection scope of the present utility model.

Claims

1. A lamp tube circuit supporting the switching between emergency lighting and general lighting, characterized in that, It includes a main control module. One end of the main control module is respectively connected to the mains power supply and the battery, and the other end is connected to the light-emitting element. The main control module is used to judge whether the input voltage of the mains power supply meets the expected driving requirement. If so, it controls the light-emitting element to start in the normal lighting mode. If not, the battery is used as the driving power supply and the light-emitting element is started in the emergency lighting mode.

2. The lamp tube circuit for supporting the switching between emergency lighting and general lighting according to claim 1, wherein, A rectification module is further included between the main control module and the mains power supply. The rectification module is used to convert the voltage of the mains power supply into the driving voltage required to adapt to the light-emitting element.

3. The tube circuit for supporting the switching between emergency lighting and general lighting according to claim 2, wherein, The main control module includes a main control chip. The rectification module includes a transformer and a voltage conversion chip. The output end of the mains power supply and the adjustment pin of the voltage conversion chip are commonly connected to the first transformer coil T1A of the transformer. The second transformer coil of the transformer is coupled to the first driving control pin of the main control chip.

4. The tube circuit for supporting the switching between emergency lighting and general lighting according to claim 3, wherein A first field-effect transistor is further included. The source electrode of the first field-effect transistor is coupled to the second transformer coil T2E of the transformer, the gate electrode is connected to the first driving control pin, and the drain electrode is sequentially connected with a first inductor and the battery.

5. The lamp tube circuit for supporting the switching between emergency lighting and general lighting according to claim 4, characterized in that, A second inductor and a first MOS transistor are further included. One end of the second inductor is coupled to the second transformer coil T2E of the transformer, and the other end is connected to the drain electrode of the first MOS transistor. The source electrode of the first MOS transistor is coupled to SGND, and the gate electrode is coupled to the second driving control pin of the main control chip.

6. The tube circuit for supporting the switching between emergency lighting and general lighting according to claim 5, characterized in that, A first triode and a second triode are further included between the second driving control pin and the first MOS transistor. The base electrodes of the first triode and the second triode are commonly connected to the second driving control pin. The emitter electrodes of the first triode and the second triode are commonly connected to the gate electrode of the first MOS transistor. The collector electrode of the first triode is coupled to VDD, and the collector electrode of the second triode is coupled to SGND.

7. The tube circuit for supporting the switching between emergency lighting and general lighting according to claim 6, characterized in that, A second MOS transistor and a third MOS transistor are further included. The source electrodes of the second MOS transistor and the third MOS transistor are commonly coupled to the drain electrode of the first MOS transistor. The drain electrode of the second MOS transistor is coupled to the first electrode, and the gate electrode is coupled to the first dimming pin of the main control chip. The drain electrode of the third MOS transistor is coupled to the second electrode, and the gate electrode is coupled to the second dimming pin of the main control chip.

8. The lamp tube circuit for supporting the switching between emergency lighting and normal lighting according to claim 3, wherein, The linkage control pin of the secondary control chip U3 is coupled to the cooperative control pin of the main control chip. The input end of the secondary control chip U3 is connected to a plurality of keys, and the output end is connected to the light-emitting element.

9. The tube circuit for supporting the switching between emergency lighting and general lighting according to claim 3, characterized in that, A circuit breaker is further included. One end of the circuit breaker is coupled to the mains power supply, and the other end is coupled to a first optical relay. The second transformer coil of the transformer is coupled with a second optical relay, and the first optical relay and the second optical relay are matched and connected.

10. The lamp tube circuit for supporting the switching between emergency lighting and general lighting according to claim 1, wherein A power protection module coupled to the battery is further included. The power protection module is used to detect the power value of the battery. When the power value is lower than the preset threshold, the battery is in a disconnected state from the main control module.

Images