WO2021012156A1

WO2021012156A1 - Lamp tube and protection circuit and protection device applied to same

Info

Publication number: WO2021012156A1
Application number: PCT/CN2019/097127
Authority: WO
Inventors: 黄绍丰; 罗杨洋; 杨林; 杨海涛
Original assignee: 深圳市豪恩智能物联股份有限公司
Priority date: 2019-07-22
Filing date: 2019-07-22
Publication date: 2021-01-28
Also published as: CN110786079B; CN110786079A

Abstract

The present application belongs to the technical field of lamps, and in particular relates to a lamp tube, and a protection circuit and a protection device applied to the same, wherein an analog filament circuit is arranged at both poles of the lamp tube for receiving an AC signal provided by an AC power supply to pre-heat the protection circuit, the AC signal is rectified by a rectifier circuit, and a corresponding DC voltage signal is output, then a control circuit controls the on and off of the DC voltage signal on the basis of a connection state of the protection circuit with an external circuit, and finally, an energy storage circuit avoids sudden changes in the voltage of a light source module to ensure that the lamp tube does not leak in the power access process, thereby solving the problem of greater safety hazards in a live operation during the lamp tube replacement process.

Description

Lamp tube, protection circuit and protection device applied to lamp tube

Technical field

This application belongs to the technical field of lamps, and in particular relates to a lamp tube and a protection circuit and a protection device applied to the lamp tube.

Background technique

With the continuous improvement of technology and productivity, the application of LED light sources in lighting products is increasing. As an emerging light source, LED lights play a very important role and contribution in energy saving, emission reduction, and environmental protection. In order to avoid safety accidents during use or installation of LED lights, various protective measures are usually adopted, such as : The driving power adopts an isolated power supply; the built-in driving power is wrapped with insulating materials such as Mylar sheets and insulating tape for double insulation; the lamp body is made of PC material, nanotubes, glass tubes, etc.; the lamp holder is made of PC insulating materials, etc.

However, when the user replaces the lamp in a live environment, the existing lamp protection measures are insufficient, and there is a greater safety hazard.

technical problem

The embodiments of the present application provide a lamp tube, a protection circuit and a protection device applied to the lamp tube, and aim to solve the technical problem of insufficient protection measures for the existing lamp tube.

Technical solutions

The first aspect of the embodiments of the present application provides a protection circuit applied to a lamp tube, which is connected to a light source module, and the protection circuit includes:

Two analog filament circuits respectively connected to the two poles of the lamp tube for receiving an AC signal provided by an AC power source and providing a preheating effect on the protection circuit;

A rectifier circuit connected to the analog filament circuit for rectifying the AC signal and outputting a corresponding DC voltage signal;

A control circuit connected to the rectifier circuit for receiving the DC voltage signal and controlling the on and off of the DC voltage signal according to the connection state of the protection circuit and the external circuit; and

They are respectively connected with the light source module and the control circuit to provide an energy storage circuit for energy storage.

The second aspect of the embodiments of the present application provides a protection device applied to a lamp tube, including:

Light source module; and

In the protection circuit according to any one of the above, the protection circuit is connected to the light source module.

A lamp tube provided in the third aspect of the embodiments of the present application includes:

Light source module;

Package body; and

The protection circuit as described in any one of the above;

Wherein, the package body is used to package the light source module and the protection circuit.

Beneficial effect

The embodiment of the present application provides a lamp tube and a protection circuit and a protection device applied to the lamp tube. An analog filament circuit is provided at both poles of the lamp tube to receive an AC signal provided by an AC power source, and the protection circuit is Preheating, and rectify the AC signal through the rectifier circuit, and output the corresponding DC voltage signal, and then through the control circuit based on the connection status of the protection circuit and the external circuit to conduct the DC voltage signal and Turn off for control, and finally avoid sudden changes in the voltage of the light source module through the energy storage circuit, to ensure that the lamp does not leak during the power supply process, and solve the major safety hazards in the live operation during the lamp replacement process The problem.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following will briefly introduce the accompanying drawings needed in the description of the embodiments or the prior art. It should be understood that the following drawings only show some of the present application. The embodiments should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative work, other related drawings can be obtained from these drawings.

FIG. 1 is a schematic structural diagram of a protection circuit provided by the first embodiment of the present application;

2 is a schematic structural diagram of a protection circuit provided by a second embodiment of the present application;

3a-3c are schematic diagrams of the structure of a first analog filament circuit provided by an embodiment of the present application;

4a-4c are schematic structural diagrams of a third analog filament circuit provided by an embodiment of the present application;

5 is a schematic structural diagram of a protection circuit provided by a third embodiment of the present application;

6 is a schematic structural diagram of a protection circuit provided by a fourth embodiment of the present application;

7a and 7b are schematic diagrams of the structure of a current limiting circuit provided by an embodiment of the present application;

Figure 7c is a schematic structural diagram of a control circuit provided by another embodiment of the present application;

8a and 8b are schematic diagrams of the structure of a switch circuit provided by an embodiment of the present application;

Fig. 8c is a schematic structural diagram of a control circuit provided by another embodiment of the present application;

FIG. 9 is a schematic structural diagram of a driving circuit provided by an embodiment of the present application.

Embodiments of the invention

In order to make the purpose, technical solutions, and advantages of this application clearer, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the application, and are not used to limit the application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of the present application.

During the design and manufacture of the lamp tube, the safety of the product is usually fully considered, and a variety of protective measures are adopted, for example: the driving power supply adopts an isolated power supply; the built-in driving power supply is wrapped with insulating materials such as Mylar sheets and insulating tape for double insulation ; The lamp body is made of PC material, nanotubes, glass tubes, etc.; the lamp holder is also made of PC insulating materials and so on. Although the above protection measures can achieve better results, the above protection measures cannot completely eliminate the hidden safety hazards in the lamp replacement process. For example, when the user installs a T-shaped LED lamp, in most cases There is no way for the user to pull down the main switch to disconnect all the circuits before installing the lamp. Therefore, the user needs to complete the lamp replacement operation when the circuit is live, for example, a lamp holder has two When there is an LED tube, one of the tubes lights up normally, and when there is still electricity in the circuit, the user needs to replace the other tube that has failed. At this time, when the user inserts one end of the LED tube into the lamp holder, the two PIN pins at this end of the LED tube become a charged body. Because the internal circuit is a charged body, the two PINs at the other end of the LED tube The needles have also become charged bodies. If the user accidentally touches any PIN pin on the other end, there is a huge risk of electric shock.

The technical solution in this application can effectively solve the above-mentioned risk of electric shock caused by the leakage current of the PIN needle at the end of the LED lamp tube, and provide users with more favorable safety guarantees when installing and disassembling products, while also meeting UL requirements. The latest standard for related leakage current testing.

The embodiment of the present application provides a protection circuit applied to a lamp tube, and the protection circuit in this embodiment includes:

Two analog filament circuits 100 respectively connected to the two poles of the lamp tube for receiving AC signals provided by an AC power source and providing preheating effects on the protection circuit;

A rectifier circuit 200 connected to the analog filament circuit for rectifying the AC signal and outputting a corresponding DC voltage signal;

A control circuit 300 connected to the rectifier circuit 200 for receiving the DC voltage signal and controlling the on and off of the DC voltage signal according to the connection state of the protection circuit and the external circuit; and

The energy storage circuit 400 is respectively connected with the light source module 500 and the control circuit 300 for providing energy storage.

In this embodiment, an analog filament circuit is provided at both poles of the lamp tube to receive the AC signal provided by the AC power supply, preheat the protection circuit, and perform rectification processing on the AC signal through the rectifier circuit 200 , And output the corresponding DC voltage signal, and then control the on and off of the DC voltage signal based on the connection state of the protection circuit and the external circuit through the control circuit 300, and finally avoid the light source mode by the energy storage circuit 400 The sudden change in the voltage of the group 500 ensures that the lamp does not leak during the power supply process, and solves the problem of greater safety hazards in the live operation during the lamp replacement process.

In one embodiment, FIG. 1 shows a schematic structural diagram of a protection circuit applied to a lamp tube provided by an embodiment of the present application. As shown in FIG. 1, the two analog filament circuits include a first analog filament circuit. 101 and a second analog filament circuit 102; the first analog filament circuit 101 and the second analog filament circuit 102 are both connected to the rectifier circuit 200.

In this embodiment, the two poles of the lamp tube are respectively provided with an analog filament circuit, and the analog filament circuit is given an impedance matching function to ensure that the electronic ballast (ECG) can smoothly enter the working state at the initial stage of system startup. The rectifier circuit 200 is used for rectifying the AC signal outputted by the ECG to obtain a corresponding DC voltage signal to achieve the purpose of AC-DC conversion. The control circuit 300 can identify the application environment of the lamp tube. When the connecting pin of the lamp tube is connected to the ECG output loop, the control circuit 300 turns on and connects the subsequent circuit. When the connecting pin is incorrectly connected to the power frequency grid, the control circuit 300 can limit the output current by the control circuit 300 to a small safe current range. In this embodiment, the lamp tube includes a first pole and a second pole. The first pole and the second pole are respectively used to connect to the electronic rectifier. Specifically, the first input terminal of the first analog filament circuit 101 and the second pole of the lamp tube The first connection pin of one pole is connected, the second input end of the first analog filament circuit 101 is connected to the second connection pin of the first pole of the lamp tube, and the first input end of the second analog filament circuit 102 is connected to the second pole of the lamp. The third connecting pin of the second analog filament circuit 102 is connected to the fourth connecting pin of the second pole of the lamp tube.

In an embodiment, the tank circuit 400 may be a capacitor, the first end of the capacitor is connected to the control circuit 300, and the other end of the capacitor is grounded.

In one embodiment, referring to FIG. 2, the two analog filament circuits include a third analog filament circuit 103 and a fourth analog filament circuit 104; the rectifier circuit 200 includes a first rectifier circuit 201 and a second rectifier circuit 202; wherein, the first rectifier circuit 201 is provided between the third analog filament circuit 103 and the control circuit 300, and the second rectifier circuit 202 is provided between the fourth analog filament circuit 104 and the Between the control circuit 300.

In this embodiment, both poles of the lamp tube are provided with an analog filament circuit and a rectifier circuit 200, wherein the analog filament circuit is provided between the rectifier circuit 200 and the lamp tube connection pin, and the rectifier circuit 200 at both poles of the lamp tube generates a DC voltage The signal is output to the control circuit 300, and a full-wave rectifier circuit 200 is provided at both poles of the lamp tube to respectively rectify the input AC signal, so as to avoid the failure of the analog filament circuit at both ends to cause a large current impact on the rectifier circuit 200.

In one embodiment, the specific circuit structure of the analog filament circuit provided at the two poles of the lamp tube can be completely the same. Further, the specific circuit structure of the rectifier circuit 200 provided at the two poles of the lamp tube can also be completely the same.

In one embodiment, referring to FIG. 3a, the first analog filament circuit 101 includes: a first resistor R1, a second resistor R2, a third resistor R3, and a first capacitor C1;

The first end of the first resistor R1 is connected to the first connecting pin of the lamp tube, the second end of the first resistor R1, the first end of the first capacitor C1, and the third resistor R3 The first end of the second resistor R2 is connected to the second connecting pin of the lamp tube, the second end of the second resistor R2 and the second end of the first capacitor C1 And the second end of the third resistor R3 is commonly connected to the rectifier circuit 200.

In one embodiment, referring to FIG. 3b, the first analog filament circuit 101 includes: a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a fifth inductor L5, a sixth inductor, and a fifth capacitor C5;

The first end of the tenth resistor R10 is connected to the first connecting pin of the lamp tube, the second end of the tenth resistor R10 is connected to the first end of the fifth inductor L5, and the fifth inductor The second end of L5, the first end of the fifth capacitor C5, and the first end of the ninth resistor R9 are commonly connected, and the first end of the eleventh resistor R11 is connected to the second connection of the lamp tube Pin connection, the second end of the eleventh resistor R11 is connected to the first end of the sixth inductor, the second end of the sixth inductor, the second end of the fifth capacitor C5, and the The second ends of the nine resistors R9 are commonly connected to the rectifier circuit 200.

In one embodiment, referring to FIG. 3c, the first analog filament circuit 101 includes: a first inductor L1, a second inductor L2, a third capacitor C3, and a seventh resistor R7;

The first end of the first inductor L1 is connected to the first connecting pin of the lamp tube, the second end of the first inductor L1, the first end of the third capacitor C3, and the seventh resistor R7 The first end of the second inductor L2 is connected to the second connection pin of the lamp tube, the second end of the second inductor L2 and the second end of the third capacitor C3 And the second end of the seventh resistor R7 is commonly connected to the rectifier circuit 200.

In an embodiment, the internal circuit structure of the second analog filament circuit 102 may be the same as the internal circuit structure of the first analog filament circuit 101.

In one embodiment, referring to FIG. 4a, the third analog filament circuit 103 includes: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a second capacitor C2;

The first end of the fourth resistor R4 is connected to the first connection pin of the lamp tube, the second end of the fourth resistor R4, the first end of the second capacitor C2, and the sixth resistor R6 The first end of the fifth resistor R5 is connected to the first input end of the first rectifier circuit 201, the first end of the fifth resistor R5 is connected to the second connecting pin of the lamp tube, and the first end of the fifth resistor R5 The two terminals, the second terminal of the second capacitor C2 and the second terminal of the sixth resistor R6 are commonly connected to the second input terminal of the first rectifier circuit 201.

In one embodiment, referring to FIG. 4b, the third analog filament circuit 103 includes: a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a seventh inductor L7, an eighth inductor L8, and The sixth capacitor C6;

The first end of the thirteenth resistor R13 is connected to the first connecting pin of the lamp tube, the second end of the thirteenth resistor R13 is connected to the first end of the seventh inductor L7, and the The second end of the seventh inductor L7, the first end of the sixth capacitor C6, and the first end of the twelfth resistor R12 are commonly connected to the first input end of the first rectifier circuit 201, and the tenth The first end of the four resistor R14 is connected to the second connecting pin of the lamp tube, the second end of the fourteenth resistor R14 is connected to the first end of the eighth inductor L8, and the eighth inductor L8 The second terminal, the second terminal of the sixth capacitor C6 and the second terminal of the twelfth resistor R12 are commonly connected to the second input terminal of the first rectifier circuit 201.

In one embodiment, referring to FIG. 4c, the third analog filament circuit 103 includes: a third inductor L3, a fourth inductor L4, a fourth capacitor C4, and an eighth resistor R8;

The first end of the third inductor L3 is connected to the first connection pin of the lamp tube, the second end of the third inductor L3, the first end of the fourth capacitor C4, and the eighth resistor R8 The first end of the fourth inductor L4 is connected to the first input end of the first rectifier circuit 201. The first end of the fourth inductor L4 is connected to the second connecting pin of the lamp tube. The two terminals, the second terminal of the fourth capacitor C4 and the second terminal of the eighth resistor R8 are commonly connected to the second input terminal of the first rectifier circuit 201.

In one embodiment, the internal circuit structure of the fourth analog filament circuit 104 may be the same as the internal circuit structure of the third analog filament circuit 103.

In an embodiment, referring to FIG. 5, the control circuit 300 includes:

A current limiting circuit 900 connected to the rectifier circuit 200 and used for current limiting processing on the DC voltage signal;

The switch circuit 1000 is respectively connected to the rectifier circuit 200 and the energy storage circuit 400 and is used to control the on and off of the DC voltage signal.

In this embodiment, the current-limiting circuit 900 performs current-limiting processing on the DC voltage signal output by the rectifier circuit 200, so that when the switching circuit 1000 is turned off, when the lamp is connected to a power source, the current-limiting circuit 900 can reduce the DC voltage signal. The current is limited to a lower preset threshold, which eliminates the potential safety hazard of electric shock to the user when the lamp is connected abnormally.

In an embodiment, referring to FIG. 6, the protection circuit further includes:

Set between the analog filament circuit 100 and the control circuit 300, used to detect the connection state of the protection circuit and the external circuit, and send a corresponding drive signal to the control circuit 300 according to the connection state The drive circuit 800; the drive signal is used to control the on and off states of the switch circuit 1000. .

In this embodiment, the current signal in the analog filament circuit 100 is sampled by the drive circuit 800, and the connection state between the protection circuit and the external circuit is detected by the sampling signal, so as to check the external connection state of the LED tube Identify, and output corresponding drive signals according to different situations, so that the switch circuit 1000 controls the on and off of the DC voltage signal based on the drive signal.

Further, the switching circuit 1000 turns on and off the DC voltage signal based on the driving signal. When the ECG is correctly connected to the LED tube and the power is turned on, the internal switching circuit 1000 is in the on state, and the ECG continues to be The LED module is powered and the system works normally. When the two poles of the LED tube are not properly connected, such as when the LED tube is installed or removed, when one end of the tube is inserted into the lamp holder, the other end is still suspended. Although one end of the lamp holder is inserted to make the lamp tube live, the control circuit 300 can recognize this and keep the switch circuit 1000 disconnected. At this time, even if the user grasps the metal connection pin at the other end of the lamp with his hand, There will be no electric power, which greatly improves the fault tolerance rate, thereby more effectively ensuring the personal safety of on-site users.

In this embodiment, the switch circuit 1000 plays an important role in the present invention. By connecting the switch circuit 1000 in parallel with the current limiting circuit 900, when our LED tube is correctly installed in the circuit, the switch circuit 1000 is turned on, Its own on-resistance is low and does not take up too much power consumption, so that the system efficiency can be guaranteed. In the process of installation and disassembly, the impedance of the current limiting circuit 900 is relatively large, which can play a good isolation protection effect.

In one embodiment, referring to FIG. 7a, the current limiting circuit 900 includes a twenty-sixth resistor R26 and a twenty-seventh resistor R27. The first end of the twenty-sixth resistor R26 and the second The first end of the seventeenth resistor R27 is commonly connected to the rectifier circuit 200, and the second end of the twenty-sixth resistor R26 and the second end of the twenty-seventh resistor R27 are commonly connected to the tank circuit 400.

In one embodiment, as shown in FIG. 7b, the current limiting circuit 900 includes a twenty-eighth resistor R28 and a twenty-ninth resistor R29. The first end of the twenty-eighth resistor R28 is connected to the rectifier circuit. 200 is connected, the second end of the twenty-eighth resistor R28 is connected to the first end of the twenty-ninth resistor R29, and the second end of the twenty-ninth resistor R29 is connected to the tank circuit 400 .

In one embodiment, referring to FIG. 7c, the current limiting circuit 900 includes a twentieth resistor R20, and the first end of the twentieth resistor R20 is connected to the rectifier circuit 200. The second end is connected to the tank circuit 400.

In one embodiment, referring to FIG. 7c, the switch circuit 1000 may be a thyristor Q1, the first end of the thyristor Q1 is connected to the rectifier circuit 200, and the The second end is connected to the tank circuit 400, and the control end of the thyristor Q1 is suspended.

In this embodiment, when the switching circuit 1000 is a thyristor Q1, the A pole and the K pole of the thyristor Q1 are respectively connected to the rectifier circuit 200 and the energy storage circuit 400, and the A pole of the thyristor Q1 The protection circuit may not need the driving circuit 800 at this time, or the thyristor Q1 may form an open circuit with the driving circuit 800. At this time, the driving signal provided by the driving circuit 800 is equivalent to high Resistance state signal, the gate G pole of SCR Q1 is open. In the initial stage of system startup, the three PN junctions in the internal structure of the silicon controlled silicon, the PN junctions at both ends are forward biased, and the PN junction in the middle is reverse biased. Before the thyristor Q1 is turned on, the ECG is equivalent to an open circuit and outputs high voltage, which finally makes the middle PN junction avalanche breakdown and conducts, and the system works normally. When the user is performing disassembly and assembly operations, although one end is connected through the connecting pin at the end of the lamp, the connecting pin at the other end is not connected to the circuit, so there is no high voltage between the SCR Q1A pole and the K pole. The electric field cannot break down the middle PN junction to make the thyristor Q1 continue to conduct. Therefore, even if the user accidentally touches the metal connection pin at the other end, they will not worry about electric shock. Due to the blocking of the thyristor Q1, the path of high current leading to the ground through the human body is also blocked.

In this embodiment, the thyristor Q1 is used as the switch circuit 1000, and the circuit structure is simple, and at the same time, phenomena such as arcing and ignition of the mechanical switch when the contacts are contacted and separated are avoided, which is safer and more reliable.

Further, in one embodiment, the switch circuit 1000 includes a switch tube, the current input end of the switch tube is connected to the rectifier circuit 200, and the current output end of the switch tube is connected to the energy storage circuit 400. Connected, the control end of the switch tube is connected to the driving circuit 800.

In one embodiment, the switch tube is a triode or a MOS tube. For example, referring to FIG. 8a, when the switching tube is a transistor, the transistor may be an NPN transistor Q2. Specifically, the base of the NPN transistor Q2 is connected to the driving circuit 800, and the collector of the NPN transistor Q2 is connected to the rectifier circuit. 200 is connected, and the emitter of the NPN transistor Q2 is connected to the tank circuit 400.

Referring to Figure 8b, when the switch tube is a MOS tube, the MOS tube can be an N-type MOS tube Q3. Specifically, the gate of the N-type MOS tube Q3 is connected to the driving circuit 800 as its control terminal. The source of the tube Q3 is connected to the tank circuit 400 as its current output terminal, and the drain of the N-type MOS tube Q3 is connected to the rectifier circuit 200 as its current input terminal.

In one embodiment, referring to FIG. 8c, the switch circuit 1000 includes a thyristor Q1, the first end of the thyristor Q1 is connected to the rectifier circuit 200, and the first end of the thyristor Q1 The two ends are connected to the storage circuit 400, and the control end of the thyristor Q1 is connected to the driving circuit 800. In one embodiment, referring to FIG. 9, the driving circuit 800 includes: a first inductor L1, a twentieth capacitor C20, a first diode D1, a twenty-first capacitor C21, and a twenty-third resistor R23 And the first voltage regulator tube DZ20;

The first end of the first inductor L1 is connected to the rectifier circuit 200, the second end of the first inductor L1 is connected to the first end of the twentieth capacitor C20, and the second end of the twentieth capacitor C20 is The second terminal is connected to the anode of the first diode D1, the cathode of the first diode D1, the first terminal of the twenty-first capacitor C21, and the second terminal of the twenty-third resistor R23R23 One end and the first end of the first voltage regulator tube DZ20 are commonly connected to the switch circuit 1000, the second end of the twenty-first capacitor C21, the second end of the twenty-third resistor R23R23, and The second ends of the first voltage regulator tube DZ20 are connected in common.

In one embodiment, an embodiment of the present application provides a protection device applied to a lamp tube, including: a light source module 500; and the protection circuit according to any one of the above embodiments, the protection circuit and the The light source module 500 is connected.

In an embodiment, the light source module 500 in this embodiment may be an LED chip.

In one embodiment, the embodiment of the present application provides a lamp tube, including: a light source module 500; a package body; and the protection circuit according to any one of the above embodiments; wherein, the package body is used to The light source module 500 and the protection circuit are packaged.

In an embodiment, the lamp tube in this embodiment may be an LED lamp tube, and specifically, the light source module 500 may be an LED chip.

It should be particularly pointed out that the positions of the resistors, capacitors, and inductances in the circuit diagrams shown in the application examples represent their connection nodes and connections, but they do not limit the number of components and the equivalent circuit derivatives. The new serial and parallel method that came out. For example, in the position of the first resistor in FIG. 3a, there can be no less than one resistor in series, no less than one resistor in parallel, or no less than one resistor in series and connected in parallel.

Those skilled in the art can clearly understand that for the convenience and conciseness of description, only the division of the above-mentioned functional units and circuits is used as an example. In practical applications, the above-mentioned functions can be allocated to different functional units and circuits as required. Circuit completion, that is, dividing the internal structure of the device into different functional units or circuits to complete all or part of the functions described above. The functional units and circuits in the embodiments can be integrated in one processing unit, or each unit can exist alone physically, or two or more units can be integrated in one unit. The above-mentioned integrated units can be hardware-based Formal realization can also be realized in the form of software functional units. In addition, the specific names of the functional units and circuits are only for the convenience of distinguishing each other, and are not used to limit the protection scope of this application. For the specific working process of the units and circuits in the foregoing system, reference may be made to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail or recorded in an embodiment, reference may be made to related descriptions of other embodiments.

In the embodiments provided in this application, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the device/terminal embodiment described above is only illustrative. For example, the division of the circuit or unit is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or Components can be combined or integrated into another system, or some features can be omitted or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The above-mentioned embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still implement the foregoing The technical solutions recorded in the examples are modified, or some of the technical features are equivalently replaced; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application, and should be included in Within the scope of protection of this application.

Claims

A protection circuit applied to a lamp tube, connected to a light source module, characterized in that the protection circuit includes:

Two analog filament circuits respectively connected to the two poles of the lamp tube for receiving an AC signal provided by an AC power source and providing a preheating effect on the protection circuit;

A rectifier circuit connected to the analog filament circuit for rectifying the AC signal and outputting a corresponding DC voltage signal;

A control circuit connected to the rectifier circuit for receiving the DC voltage signal and controlling the on and off of the DC voltage signal according to the connection state of the protection circuit and the external circuit; and

They are respectively connected with the light source module and the control circuit to provide an energy storage circuit for energy storage.
3. The protection circuit of claim 1, wherein the two analog filament circuits comprise a first analog filament circuit and a second analog filament circuit;

Both the first analog filament circuit and the second analog filament circuit are connected to the rectifier circuit.
5. The protection circuit of claim 1, wherein the two analog filament circuits comprise a third analog filament circuit and a fourth analog filament circuit;

The rectifier circuit includes a first rectifier circuit and a second rectifier circuit;

Wherein, the first rectifier circuit is provided between the third analog filament circuit and the control circuit, and the second rectifier circuit is provided between the fourth analog filament circuit and the control circuit.
3. The protection circuit of claim 2, wherein the first analog filament circuit comprises: a first resistor, a second resistor, a third resistor, and a first capacitor;

The first end of the first resistor is connected to the first connecting pin of the lamp tube, the second end of the first resistor, the first end of the first capacitor, and the first end of the third resistor Commonly connected, the first end of the second resistor is connected to the second connecting pin of the lamp tube, the second end of the second resistor, the second end of the first capacitor, and the third resistor The second end is commonly connected to the rectifier circuit.
3. The protection circuit of claim 2, wherein the first analog filament circuit comprises: a ninth resistor, a tenth resistor, an eleventh resistor, a fifth inductor, a sixth inductor, and a fifth capacitor;

The first end of the tenth resistor is connected to the first connection pin of the lamp tube, the second end of the tenth resistor is connected to the first end of the fifth inductor, and the second end of the fifth inductor is connected to the Terminal, the first terminal of the fifth capacitor, and the first terminal of the ninth resistor are commonly connected, the first terminal of the eleventh resistor is connected to the second connecting pin of the lamp, and the tenth The second end of a resistor is connected to the first end of the sixth inductor, and the second end of the sixth inductor, the second end of the fifth capacitor, and the second end of the ninth resistor are commonly connected to The rectifier circuit.
3. The protection circuit of claim 2, wherein the first analog filament circuit comprises: a first inductor, a second inductor, a third capacitor, and a seventh resistor;

The first end of the first inductor is connected to the first connection pin of the lamp tube, the second end of the first inductor, the first end of the third capacitor, and the first end of the seventh resistor Common connection, the first end of the second inductor is connected to the second connection pin of the lamp tube, the second end of the second inductor, the second end of the third capacitor and the seventh resistor The second end is commonly connected to the rectifier circuit.
5. The protection circuit of claim 3, wherein the third analog filament circuit comprises: a fourth resistor, a fifth resistor, a sixth resistor, and a second capacitor;

The first end of the fourth resistor is connected to the first connecting pin of the lamp tube, the second end of the fourth resistor, the first end of the second capacitor, and the first end of the sixth resistor Commonly connected to the first input terminal of the first rectifier circuit, the first terminal of the fifth resistor is connected to the second connecting pin of the lamp tube, the second terminal of the fifth resistor, the second terminal The second end of the capacitor and the second end of the sixth resistor are commonly connected to the second input end of the first rectifier circuit.
3. The protection circuit of claim 3, wherein the third analog filament circuit comprises: a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a seventh inductor, an eighth inductor, and a sixth capacitor;

The first end of the thirteenth resistor is connected to the first connecting pin of the lamp tube, the second end of the thirteenth resistor is connected to the first end of the seventh inductor, and the The second end, the first end of the sixth capacitor, and the first end of the twelfth resistor are commonly connected to the first input end of the first rectifier circuit, and the first end of the fourteenth resistor is connected to The second connecting pin of the lamp tube is connected, the second end of the fourteenth resistor is connected to the first end of the eighth inductor, the second end of the eighth inductor and the sixth capacitor The two terminals and the second terminal of the twelfth resistor are commonly connected to the second input terminal of the first rectifier circuit.
5. The protection circuit of claim 3, wherein the third analog filament circuit comprises: a third inductor, a fourth inductor, a fourth capacitor, and an eighth resistor;

The first end of the third inductor is connected to the first connection pin of the lamp tube, the second end of the third inductor, the first end of the fourth capacitor, and the first end of the eighth resistor Commonly connected to the first input terminal of the first rectifier circuit, the first terminal of the fourth inductor is connected to the second connecting pin of the lamp tube, the second terminal of the fourth inductor, the fourth The second end of the capacitor and the second end of the eighth resistor are commonly connected to the second input end of the first rectifier circuit.
8. The protection circuit of claim 1, wherein the control circuit comprises:

A current limiting circuit connected to the rectifier circuit and used to perform current limiting processing on the DC voltage signal;

A switch circuit which is respectively connected with the rectifier circuit and the energy storage circuit and is used for controlling the on and off of the direct current voltage signal.
9. The protection circuit of claim 10, wherein the protection circuit further comprises:

Set between the analog filament circuit and the switch circuit, used to detect the connection state of the protection circuit and the external circuit, and send a corresponding drive signal to the control circuit according to the connection state Circuit; the drive signal is used to control the on and off states of the switch circuit.
The protection circuit of claim 10, wherein the current limiting circuit comprises a twentieth resistor, a first end of the twentieth resistor is connected to the rectifier circuit, and a second end of the twentieth resistor Connected with the tank circuit.
The protection circuit of claim 10, wherein the current limiting circuit comprises a twenty-sixth resistor and a twenty-seventh resistor, and the first end of the twenty-sixth resistor is connected to the twenty-seventh resistor. The first end of the resistor is commonly connected to the rectifier circuit, and the second end of the twenty-sixth resistor and the second end of the twenty-seventh resistor are commonly connected to the tank circuit.
10. The protection circuit of claim 10, wherein the current limiting circuit comprises a twenty-eighth resistor and a twenty-ninth resistor, and the first end of the twenty-eighth resistor is connected to the rectifier circuit, The second end of the twenty-eighth resistor is connected to the first end of the twenty-ninth resistor, and the second end of the twenty-ninth resistor is connected to the tank circuit.
The protection circuit of claim 11, wherein the switch circuit comprises a thyristor, the first end of the thyristor is connected to the rectifier circuit, and the second end of the thyristor is connected to the rectifier circuit. The tank circuit is connected, and the control terminal of the thyristor is connected with the drive circuit.
The protection circuit of claim 11, wherein the switch circuit comprises a switch tube, the current input end of the switch tube is connected to the rectifier circuit, and the current output end of the switch tube is connected to the storage The control terminal of the switch tube is connected with the driving circuit.
The protection circuit according to claim 16, wherein the switch tube is a triode or a MOS tube.
The protection circuit of claim 11, wherein the drive circuit comprises: a first inductor, a twentieth capacitor, a first diode, a twenty-first capacitor, a twenty-third capacitor, and a first stabilizer Pressure tube

The first end of the first inductor is connected to the rectifier circuit, the second end of the first inductor is connected to the first end of the twentieth capacitor, and the second end of the twentieth capacitor is connected to the The anode of the first diode is connected, the cathode of the first diode, the first end of the twenty-first capacitor, the first end of the twenty-third resistor, and the first regulator The first end of the tube is commonly connected to the switch circuit, the second end of the twenty-first capacitor, the second end of the twenty-third resistor, and the second end of the first voltage regulator tube are commonly connected .
A protection device applied to a lamp tube, characterized in that it comprises:

Light source module; and

The protection circuit according to any one of claims 1-18, wherein the protection circuit is connected to the light source module.
A lamp tube, characterized in that it comprises:

Light source module;

Package body; and

The protection circuit according to any one of claims 1-18;

Wherein, the package body is used to package the light source module and the protection circuit.