CN210518948U - Lamp tube, protection circuit and protection device applied to lamp tube - Google Patents

Abstract

The utility model belongs to the technical field of lamps and lanterns, especially, relate to a fluorescent tube and be applied to protection circuit, protection device of fluorescent tube, through all setting up a simulation filament circuit at the fluorescent tube both ends for the alternating current signal that receiving alternating current power supply provided, it is right protection circuit preheats, and right through rectifier circuit alternating current signal carries out the rectification processing to the corresponding direct current voltage signal of output, then based on through control circuit protection circuit is right with external circuit's access state direct current voltage signal switches on and shuts off and control, and the voltage of avoiding the light source module through energy storage circuit at last appears the sudden change, ensures that the fluorescent tube can not produce electric leakage phenomenon in the power access process, has solved the problem that there is great potential safety hazard in the electrified operation of fluorescent tube replacement in-process.

Description

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

Technical Field

The utility model belongs to the technical field of lamps and lanterns, especially, relate to a fluorescent tube and be applied to protection circuit, protection device of fluorescent tube.

Background

With the continuous progress of technology and productivity, the application of LED light sources to lighting products is increasing. As an emerging light source, an LED lamp plays a very important role and contribution in energy saving, emission reduction and environmental protection, and in order to avoid safety accidents occurring during the use or installation of the LED lamp, various protective measures are usually adopted, for example: the driving power supply adopts an isolated power supply; wrapping the built-in driving power supply with Mylar films, insulating gummed paper and other insulating materials for double insulation; the lamp body is made of PC material, nanotube, glass tube and the like; the lamp cap is made of PC insulating material and the like.

However, when a user replaces a lamp tube in a live environment, the existing lamp tube protection measures are insufficient, and a large potential safety hazard exists.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fluorescent tube and be applied to protection circuit, the protection device of fluorescent tube aim at solving the not enough technical problem of current fluorescent tube safeguard measure.

The embodiment of the application provides a protection circuit for fluorescent tube is connected with the light source module, protection circuit includes:

two filament simulating circuits connected to the two poles of the lamp tube to receive the AC signal from the AC power source and to provide preheating effect to the protecting circuit;

the rectifying circuit is connected with the analog filament circuit and used for rectifying the alternating current signal and outputting a corresponding direct current voltage signal;

the control circuit is connected with the rectifying circuit and used for receiving the direct-current voltage signal and controlling the connection and disconnection of the direct-current voltage signal according to the connection state of the protection circuit and an external circuit; and

and the energy storage circuit is respectively connected with the light source module and the control circuit and is used for providing an energy storage function.

Optionally, the two analog filament circuits include a first analog filament circuit and a second analog filament circuit;

the first analog filament circuit and the second analog filament circuit are both connected with the rectifying circuit.

Optionally, the two analog filament circuits include a third analog filament circuit and a fourth analog filament circuit;

the rectifying circuit comprises a first rectifying circuit and a second rectifying circuit;

the first rectifying circuit is arranged between the third analog filament circuit and the control circuit, and the second rectifying circuit is arranged between the fourth analog filament circuit and the control circuit.

Optionally, the first analog filament circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor and a first capacitor;

the first end of the first resistor is connected with 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 are connected together, the first end of the second resistor is connected with the second connecting pin of the lamp tube, and the second end of the second resistor, the second end of the first capacitor and the second end of the third resistor are connected with the rectifying circuit together.

Optionally, the third analog filament circuit includes: a fourth resistor, a fifth resistor, a sixth resistor and a second capacitor;

the first end of the fourth resistor is connected with 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 are connected with the first input end of the first rectifying circuit in a sharing mode, the first end of the fifth resistor is connected with the second connecting pin of the lamp tube, and the second end of the fifth resistor, the second end of the second capacitor and the second end of the sixth resistor are connected with the second input end of the first rectifying circuit in a sharing mode.

Optionally, the protection circuit further includes:

and the driving circuit is arranged between the analog filament circuit and the control circuit and is used for detecting the access state of the protection circuit and the external circuit and sending a corresponding driving signal to the control circuit according to the access state.

Optionally, the control circuit includes:

the current limiting circuit is connected with the rectifying circuit and is used for performing current limiting processing on the direct-current voltage signal;

and the switching circuit is respectively connected with the rectifying circuit, the energy storage circuit and the driving circuit and is used for controlling the connection and disconnection of the direct-current voltage signal based on the driving signal.

Optionally, the switching circuit includes a switching tube, a current input end of the switching tube is connected to the rectifying circuit, a current output end of the switching tube is connected to the energy storage circuit, and a control end of the switching tube is connected to the driving circuit.

The embodiment of the present application further provides a protection device applied to a lamp tube, including:

a light source module; and

the protection circuit according to any one of the preceding claims, wherein the protection circuit is connected to the light source module.

The embodiment of the present application further provides a lamp tube, including:

a light source module;

a package body; and

a protection circuit as claimed in any one of the above claims;

the packaging body is used for packaging the light source module and the protection circuit.

The embodiment of the application provides a fluorescent tube and be applied to protection circuit, protection device of fluorescent tube, through all setting up a simulation filament circuit at the fluorescent tube both ends for receive the alternating current signal that alternating current power supply provided, it is right protection circuit preheats, and right through rectifier circuit alternating current signal carries out rectification processing to output corresponding direct current voltage signal, then based on through control circuit protection circuit is right with external circuit's access state direct current voltage signal's switching on and turn-off are controlled, and the sudden change appears in the voltage of avoiding the light source module through energy storage circuit at last, ensures that the fluorescent tube can not produce the electric leakage phenomenon in power access process, has solved the problem that there is great potential safety hazard in the live operation of fluorescent tube replacement process.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that for a person skilled in the art, other relevant drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a protection circuit according to a first embodiment of the present application;

fig. 2 is a schematic structural diagram of a protection circuit according to a second embodiment of the present application;

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

fig. 4a-4c are schematic structural diagrams of a third analog filament circuit provided by embodiments of the present application;

fig. 5 is a schematic structural diagram of a protection circuit according to a third embodiment of the present application;

fig. 6 is a schematic structural diagram of a protection circuit according to a fourth embodiment of the present application;

fig. 7a and 7b are schematic structural diagrams of a current limiting circuit provided in an embodiment of the present application;

FIG. 7c is a schematic diagram of a control circuit according to another embodiment of the present application;

fig. 8a and 8b are schematic structural diagrams of a switch circuit provided in an embodiment of the present application;

FIG. 8c is a schematic diagram of a control circuit according to another embodiment of the present application;

fig. 9 is a schematic structural diagram of a driving circuit according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the design and manufacture process of the lamp tube, the use safety of the product is generally fully considered, and various protective measures are adopted, such as: the driving power supply adopts an isolated power supply; wrapping the built-in driving power supply with Mylar films, insulating gummed paper and other insulating materials for double insulation; the lamp body is made of PC material, nanotube, glass tube and the like; the lamp base is also made of PC insulating material, etc. Although the protection measures can achieve a good effect, the protection measures cannot completely eliminate potential safety hazards existing in the tube replacement process, for example, when a user installs a T-shaped LED tube, most of the cases that the user cannot pull down the main gate first to disconnect all circuits and then install the tubes, therefore, the user needs to complete the tube replacement operation when the circuits are electrified, for example, when one lamp holder is provided with two LED tubes, one of the tubes is normally lighted, and when electricity is still available in the loop, the user needs to replace the other tube with a failed tube. At this time, after a user inserts one end of the LED lamp tube into the lamp holder, the two PIN PINs at the end of the LED lamp tube become charged bodies, and because the internal circuit of the LED lamp tube is a charged body, the two PIN PINs at the other end of the LED lamp tube also become charged bodies. There is a significant risk of electric shock if the user inadvertently touches any PIN on the other end.

The technical scheme in the application can effectively solve the above-mentioned electric shock risk caused by the leakage current of the PIN needle at the lamp holder end of the LED lamp tube, provides more favorable safety guarantee for a user during product installation and disassembly, and simultaneously meets the latest standard of UL related leakage current test.

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

two filament simulating circuits 100 connected to the two poles of the lamp tube respectively for receiving the AC signal from the AC power source and preheating the protecting circuit;

the rectifying circuit 200 is connected with the analog filament circuit and used for rectifying the alternating current signal and outputting a corresponding direct current voltage signal;

a control circuit 300 connected to the rectifying circuit 200 for receiving the dc voltage signal and controlling the on/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 to the light source module 500 and the control circuit 300, and is used for providing an energy storage function.

In this embodiment, through all setting up an analog filament circuit at the fluorescent tube both poles of the earth for receive the alternating current signal that alternating current power supply provided, it is right protection circuit preheats, and right through rectifier circuit 200 alternating current signal carries out rectification processing, and output corresponding direct current voltage signal, then through control circuit 300 based on protection circuit is right with external circuit's access state the switching on and the shutoff of direct current voltage signal are controlled, avoid light source module 500's voltage to appear the sudden change through energy storage circuit 400 at last, ensure that the fluorescent tube can not produce electric leakage phenomenon in the power access process, solved and have had great potential safety hazard in the live operation in fluorescent tube replacement process problem.

In one embodiment, fig. 1 shows a schematic structural diagram of a protection circuit applied to a lamp tube according to an embodiment of the present application, and referring to 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 rectifying circuit 200.

In this embodiment, the two electrodes of the lamp tube are respectively provided with an analog filament circuit, and the analog filament circuits are endowed with an impedance matching function, so that the electronic ballast (ECG) can smoothly enter a working state at the initial stage of system startup. The rectifying circuit 200 is used for rectifying the ac signal after the ECG output to obtain a corresponding dc voltage signal, thereby achieving the purpose of ac-dc conversion. The control circuit 300 can recognize the application environment of the lamp, and when the connection pin of the lamp is connected to the ECG output circuit, the control circuit 300 opens and turns on the post-stage circuit. When the connection pin is wrongly connected to the power frequency grid, the control circuit 300 can limit the output current within a small safe current range by the control circuit 300. In this embodiment, the lamp tube includes a first pole and a second pole, the first pole and the second pole are respectively used for being connected with the electronic rectifier, specifically, the first input end of the first analog filament circuit 101 is connected with the first connection pin of the first pole of the lamp tube, the second input end of the first analog filament circuit 101 is connected with the second connection pin of the first pole of the lamp tube, the first input end of the second analog filament circuit 102 is connected with the third connection pin of the second pole of the lamp tube, and the second input end of the second analog filament circuit 102 is connected with the fourth connection pin of the second pole of the lamp tube.

In one embodiment, the second analog filament circuit 102 may have the same circuit structure as the first analog filament circuit 101.

In one embodiment, the tank circuit 400 may be a capacitor, a first terminal of the capacitor is connected to the control circuit 300, and the other terminal 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; the first rectifying circuit 201 is disposed between the third analog filament circuit 103 and the control circuit 300, and the second rectifying circuit 202 is disposed between the fourth analog filament circuit 104 and the control circuit 300.

In this embodiment, the two poles of the lamp are respectively provided with an analog filament circuit and a rectifying circuit 200, wherein the analog filament circuit is arranged between the rectifying circuit 200 and the connecting pins of the lamp, the dc voltage signals generated by the rectifying circuits 200 at the two poles of the lamp are output to the control circuit 300, and the input ac signals are rectified by the full-wave rectifying circuits 200 respectively arranged at the two poles of the lamp, so as to prevent the analog filament circuits at the two ends from being out of order and generating large current impact on the rectifying circuit 200.

In one embodiment, the specific circuit structures of the analog filament circuits disposed at the two poles of the lamp tube may be completely the same, and further, the specific circuit structures of the rectifying circuits 200 disposed at the two poles of the lamp tube may also be completely the same.

In one embodiment, referring to fig. 3a, the first analog filament circuit 101 comprises: 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 connection pin of the lamp, the second end of the first resistor R1, the first end of the first capacitor C1 and the first end of the third resistor R3 are connected together, the first end of the second resistor R2 is connected to the second connection pin of the lamp, and the second end of the second resistor R2, the second end of the first capacitor C1 and the second end of the third resistor R3 are connected together to the rectifier circuit 200.

In one embodiment, referring to fig. 3b, the first analog filament circuit 101 comprises: 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 connection pin of the lamp, the second end of the tenth resistor R10 is connected to the first end of the fifth inductor L5, the second end of the fifth inductor L5, the first end of the fifth capacitor C5 and the first end of the ninth resistor R9 are connected in common, the first end of the eleventh resistor R11 is connected to the second connection pin of the lamp, the second end of the eleventh resistor R11 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 C5 and the second end of the ninth resistor R9 are connected in common to the rectifier circuit 200.

In one embodiment, referring to fig. 3c, the first analog filament circuit 101 comprises: 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 connection pin of the lamp, the second end of the first inductor L1, the first end of the third capacitor C3 and the first end of the seventh resistor R7 are connected together, the first end of the second inductor L2 is connected to the second connection pin of the lamp, and the second end of the second inductor L2, the second end of the third capacitor C3 and the second end of the seventh resistor R7 are connected together to the rectifier circuit 200.

In one 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 comprises: 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, the second end of the fourth resistor R4, the first end of the second capacitor C2 and the first end of the sixth resistor R6 are connected to the first input end of the first rectifying circuit 201, the first end of the fifth resistor R5 is connected to the second connection pin of the lamp, the second end of the fifth resistor R5, the second end of the second capacitor C2 and the second end of the sixth resistor R6 are connected to the second input end of the first rectifying circuit 201.

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

a first end of the thirteenth resistor R13 is connected to the first connection pin of the lamp, a second end of the thirteenth resistor R13 is connected to the first end of the seventh inductor L7, a second end of the seventh inductor L7, a first end of the sixth capacitor C6 and a first end of the twelfth resistor R12 are commonly connected to the first input end of the first rectifying circuit 201, a first end of the fourteenth resistor R14 is connected to the second connection pin of the lamp, a second end of the fourteenth resistor R14 is connected to the first end of the eighth inductor L8, a second end of the eighth inductor L8, a second end of the sixth capacitor C6 and a second end of the twelfth resistor R12 are commonly connected to the second input end of the first rectifying circuit 201.

In one embodiment, referring to fig. 4c, the third analog filament circuit 103 comprises: 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, the second end of the third inductor L3, the first end of the fourth capacitor C4 and the first end of the eighth resistor R8 are connected to the first input end of the first rectifying circuit 201, the first end of the fourth inductor L4 is connected to the second connection pin of the lamp, the second end of the fourth inductor L4, the second end of the fourth capacitor C4 and the second end of the eighth resistor R8 are connected to the second input end of the first rectifying 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 one embodiment, referring to fig. 5, the control circuit 300 includes:

a current limiting circuit 900 connected to the rectifying circuit 200 for performing a current limiting process on the dc voltage signal;

and a switch circuit 1000 connected to the rectifying circuit 200 and the energy storage circuit 400, respectively, for controlling 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 rectifying circuit 200, so that when the switching circuit 1000 is turned off, and the lamp is connected to the power supply, the current of the dc voltage signal can be limited within a lower preset threshold range by the current limiting circuit 900, thereby eliminating the potential safety hazard of electric shock to the user when the lamp is connected abnormally.

In one embodiment, referring to fig. 6, the protection circuit further includes:

the driving circuit 800 is arranged between the analog filament circuit 100 and the control circuit 300, and is used for detecting the access state of the protection circuit and an external circuit and sending a corresponding driving signal to the control circuit 300 according to the access state; the driving signal is used to control the on and off states of the switching circuit 1000.

In this embodiment, the current signal in the analog filament circuit 100 is sampled by the driving circuit 800, and the access state between the protection circuit and the external circuit is detected by the sampling signal, so as to identify the external access state of the LED tube, and output a corresponding driving signal according to different conditions, so that the switching circuit 1000 controls the on and off of the dc voltage signal based on the driving signal.

Further, the switch circuit 1000 switches on and off the direct current voltage signal based on the driving signal, when the ECG is correctly connected with the LED lamp tube and the power is turned on, the internal switch circuit 1000 is in a conducting state, the ECG continuously supplies power to the LED module, and the system normally works. When the two poles of the LED lamp tube are not correctly connected, for example, when the LED lamp tube is mounted and dismounted, one end of the lamp tube is inserted into the lamp holder, and the other end of the lamp tube is still suspended. Although the lamp is charged by inserting into one end of the lamp holder, the control circuit 300 can recognize the lamp, so that the switching circuit 1000 is kept disconnected, at the moment, even if a user holds the metal connecting pin at the other end of the lamp by hand, the situation of being electrified can not occur, so that the fault tolerance rate is greatly improved, and the personal safety of a field user is more effectively ensured.

In this embodiment, switch circuit 1000 is in the utility model discloses in have the status of lifting the weight, through parallelly connected switch circuit 1000 and current-limiting circuit 900, after in our LED fluorescent tube correctly installed the circuit, switch circuit 1000 switched on, and its self on-resistance is lower, can not occupy too much consumption, makes system efficiency can obtain the guarantee. In the process of installation and disassembly, the current limiting circuit 900 has larger impedance, and can play a good role in isolation protection.

In one embodiment, referring to fig. 7a, the current limiting circuit 900 includes a twenty-sixth resistor R26 and a twenty-seventh resistor R27, a first end of the twenty-sixth resistor R26 and a first end of the twenty-seventh resistor R27 are connected to the rectifying circuit 200, and a second end of the twenty-sixth resistor R26 and a second end of the twenty-seventh resistor R27 are connected to the energy storage circuit 400.

In one embodiment, referring to fig. 7b, the current limiting circuit 900 includes a twenty-eighth resistor R28 and a twenty-ninth resistor R29, a first end of the twenty-eighth resistor R28 is connected to the rectifying circuit 200, a second end of the twenty-eighth resistor R28 is connected to a first end of the twenty-ninth resistor R29, and a second end of the twenty-ninth resistor R29 is connected to the energy storage circuit 400.

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

In one embodiment, referring to fig. 7c, the switching circuit 1000 may be a thyristor Q1, a first terminal of the thyristor Q1 is connected to the rectifying circuit 200, a second terminal of the thyristor Q1 is connected to the energy storage circuit 400, and a control terminal of the thyristor Q1 is floating.

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 rectifying circuit 200 and the tank circuit 400, and the a pole and the K pole of the thyristor Q1 are forward biased, at this time, the protection circuit may not need the driving circuit 800, 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 a high-impedance signal, and the G pole of the thyristor Q1 is open circuit. At the initial stage of system startup, the three PN junctions of the internal structure of the controllable silicon Q1 are forward biased by the PN junctions at the two ends and reverse biased by the PN junction in the middle. Before the thyristor Q1 is conducted, the ECG is equivalent to an open circuit, high voltage is output, and finally avalanche breakdown of the middle PN junction is conducted, and the system works normally. When a user carries out dismounting operation, although one end of the thyristor is connected through the connecting pin at the lamp holder end, the connecting pin at the other end is not connected into the circuit, so that a high-voltage large electric field is not formed between the pole Q1A and the pole K of the thyristor, and the middle PN junction cannot be broken down to enable the thyristor Q1 to be continuously conducted. Therefore, even if the user accidentally touches the metal connecting pin at the other end, the electric shock is not worried, and the path of large current to the ground through the human body is also blocked due to the blocking of the thyristor Q1.

In this embodiment, the thyristor Q1 is used as the switching circuit 1000, so that the circuit architecture is simple, and arcing, ignition and other phenomena of the mechanical switch during contact and separation of the contacts are avoided, thereby being safer and more reliable.

Further, in an embodiment, the switching circuit 1000 includes a switching tube, a current input end of the switching tube is connected to the rectifying circuit 200, a current output end of the switching tube is connected to the energy storage circuit 400, and a control end of the switching 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 transistor is a triode, the triode may be an NPN-type triode Q2, specifically, a base of the NPN-type triode Q2 is connected to the driving circuit 800, a collector of the NPN-type triode Q2 is connected to the rectifying circuit 200, and an emitter of the NPN-type triode Q2 is connected to the energy storage circuit 400.

Referring to fig. 8b, when the switching transistor is a MOS transistor, the MOS transistor may be an N-type MOS transistor Q3, specifically, the gate of the N-type MOS transistor Q3 is connected to the driving circuit 800 as its control terminal, the source of the N-type MOS transistor Q3 is connected to the energy storage circuit 400 as its current output terminal, and the drain of the N-type MOS transistor Q3 is connected to the rectifying circuit 200 as its current input terminal.

In one embodiment, referring to fig. 8c, the switching circuit 1000 includes a thyristor Q1, a first terminal of the thyristor Q1 is connected to the rectifying circuit 200, a second terminal of the thyristor Q1 is connected to the energy storage circuit 400, and a control terminal 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, a twenty-third resistor R23 and a first voltage regulator DZ 20;

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

In one embodiment, 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 is connected to the light source module 500.

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

In one embodiment, the present application provides a lamp tube, including: a light source module 500; a package body; and a protection circuit as described in any one of the above embodiments; the package is used for packaging the light source module 500 and the protection circuit.

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

The embodiment of the application provides a fluorescent tube and be applied to protection circuit, protection device of fluorescent tube, through all setting up a simulation filament circuit at the fluorescent tube both ends for receive the alternating current signal that alternating current power supply provided, it is right protection circuit preheats, and right through rectifier circuit alternating current signal carries out rectification processing to output corresponding direct current voltage signal, then based on through control circuit protection circuit is right with external circuit's access state direct current voltage signal's switching on and turn-off are controlled, and the sudden change appears in the voltage of avoiding the light source module through energy storage circuit at last, ensures that the fluorescent tube can not produce the electric leakage phenomenon in power access process, has solved the problem that there is great potential safety hazard in the live operation of fluorescent tube replacement process.

It should be particularly noted that the positions of the resistors, capacitors and inductors in the respective circuit diagrams shown in the embodiments of the application represent the connection nodes and the connection relationships thereof, but the number of the components and the new series-parallel manner derived from the equivalent circuit are not limited. For example, the position of the first resistor in fig. 3a can be implemented by connecting at least one resistor in series, or at least one resistor in parallel, or at least one resistor in series and/or at least one resistor in parallel.

It is obvious to those skilled in the art that for convenience and simplicity of description, the foregoing functional units and circuits are merely illustrated in terms of division, and in practical applications, the above functions may be distributed as different functional units and circuits according to needs, that is, the internal structure of the device is divided into different functional units or circuits to complete all or part of the above described functions. In the embodiments, each functional unit and each circuit may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit, and the integrated units may be implemented in a form of hardware, or in a form of software functional units. In addition, specific names of the functional units and circuits are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and circuits in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, the division of the circuit or unit is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. The utility model provides a be applied to protection circuit of fluorescent tube, is connected with the light source module, its characterized in that, protection circuit includes:

two filament simulating circuits connected to the two poles of the lamp tube to receive the AC signal from the AC power source and to provide preheating effect to the protecting circuit;

the rectifying circuit is connected with the analog filament circuit and used for rectifying the alternating current signal and outputting a corresponding direct current voltage signal;

the control circuit is connected with the rectifying circuit and used for receiving the direct-current voltage signal and controlling the connection and disconnection of the direct-current voltage signal according to the connection state of the protection circuit and an external circuit; and

and the energy storage circuit is respectively connected with the light source module and the control circuit and is used for providing an energy storage function.

2. The protection circuit of claim 1, wherein the two analog filament circuits comprise a first analog filament circuit and a second analog filament circuit;

the first analog filament circuit and the second analog filament circuit are both connected with the rectifying circuit.

3. The protection circuit of claim 1, wherein the two analog filament circuits include a third analog filament circuit and a fourth analog filament circuit;

the rectifying circuit comprises a first rectifying circuit and a second rectifying circuit;

the first rectifying circuit is arranged between the third analog filament circuit and the control circuit, and the second rectifying circuit is arranged between the fourth analog filament circuit and the control circuit.

4. The protection circuit of claim 2, wherein the first analog filament circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor and a first capacitor;

the first end of the first resistor is connected with 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 are connected together, the first end of the second resistor is connected with the second connecting pin of the lamp tube, and the second end of the second resistor, the second end of the first capacitor and the second end of the third resistor are connected with the rectifying circuit together.

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 with 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 are connected with the first input end of the first rectifying circuit in a sharing mode, the first end of the fifth resistor is connected with the second connecting pin of the lamp tube, and the second end of the fifth resistor, the second end of the second capacitor and the second end of the sixth resistor are connected with the second input end of the first rectifying circuit in a sharing mode.

6. The protection circuit of claim 1, wherein the control circuit comprises:

the current limiting circuit is connected with the rectifying circuit and is used for performing current limiting processing on the direct-current voltage signal;

and the switching circuit is respectively connected with the rectifying circuit and the energy storage circuit and is used for controlling the connection and disconnection of the direct-current voltage signal.

7. The protection circuit of claim 6, wherein the protection circuit further comprises:

the driving circuit is arranged between the analog filament circuit and the switch circuit and used for detecting the access state of the protection circuit and an external circuit and sending a corresponding driving signal to the control circuit according to the access state; the driving signal is used for controlling the on and off states of the switch circuit.

8. The protection circuit of claim 7, wherein the switching circuit comprises a switching tube, a current input end of the switching tube is connected with the rectifying circuit, a current output end of the switching tube is connected with the energy storage circuit, and a control end of the switching tube is connected with the driving circuit.

9. A protection device applied to a lamp tube is characterized by comprising:

a light source module; and

the protection circuit of any one of claims 1-8, the protection circuit being connected to the light source module.

10. A lamp tube, comprising:

a light source module;

a package body; and

the protection circuit of any one of claims 1-8;

the packaging body is used for packaging the light source module and the protection circuit.

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