CN113271698B

CN113271698B - Single-ended power supply 1-10V T8 LED dimming lamp tube

Info

Publication number: CN113271698B
Application number: CN202110471272.XA
Authority: CN
Inventors: 徐誉恒; 徐洪亮; 杨恒; 唐建华
Original assignee: JIANGSU SUN & MOON LIGHTING CO LTD
Current assignee: JIANGSU SUN & MOON LIGHTING CO LTD
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2024-06-04
Anticipated expiration: 2041-04-29
Also published as: CN113271698A

Abstract

The invention discloses a single-ended power supply 1-10V T8 LED dimming lamp tube, which belongs to the technical field of LED lamps, and comprises a high PF (power factor) end LED constant current circuit, an LED lamp panel, an isolation circuit and a 1-10V to PWM (pulse width modulation) circuit, wherein the technical problem that the 0/1-10V T8 LED lamp tube cannot solve the withstand voltage safety is solved.

Description

Single-ended power supply 1-10V T8 LED dimming lamp tube

Technical Field

The invention belongs to the technical field of LED lamps, and relates to a single-ended power supply 1-10V T8 LED dimming lamp tube.

Background

At present, an LED lamp tube on the market is usually used for supplying power to an alternating current commercial power, the brightness of the lamp light is fixed, and the dimming requirement cannot be met. The 0/1-10V dimming lamp has a large occupancy in the North America market, and the dimming comfort and the operation convenience are ensured in the market; the T8 LED lamp tube with the mode is sampled, and a product is on the market, and even if the similar dimming T8 LED lamp tube is used, a 0/1-10V dimming line is LED out additionally, so that the installation and the use are greatly unchanged. The dimming T8 LED lamp tube with 0/1-10V cannot be used in a large amount because the input AC end belongs to high-voltage power supply; the 0/1-10V dimming control signal belongs to a low-voltage signal, and the withstand voltage safety cannot be ensured, so that the marketized operation of 0/1-10V products is restricted.

Disclosure of Invention

The invention aims to provide a single-ended power supply 1-10V T8 LED dimming lamp tube, which solves the technical problem that the 0/1-10V T8 LED lamp tube cannot solve the withstand voltage safety.

In order to achieve the above purpose, the invention adopts the following technical scheme:

A single-ended power supply 1-10V T8 LED dimming lamp tube comprises a high PF (power factor) LED constant current circuit with a DIM end, an LED lamp panel, an isolation circuit and a 1-10V PWM (pulse width modulation) conversion circuit, wherein the high PF LED constant current circuit with the DIM end is respectively connected with the LED lamp panel and the isolation circuit, and the 1-10V PWM conversion circuit is connected with the isolation circuit;

the high PF LED constant current circuit with the DIM end is externally connected with commercial power, and the 1-10V-to-PWM circuit is externally connected with a dimming signal.

Preferably, the high PF (power factor) LED constant current circuit with the DIM terminal comprises a non-isolated Boost circuit, a Buck circuit, a Boost-Buck circuit or an isolated Flyback circuit.

Preferably, the LED lamp panel comprises a plurality of LED lamp beads, and the LED lamp beads are connected in a full series or mixed connection of series and parallel.

Preferably, the dimming signal is a 0-10V dimming voltage signal or a 1-10V dimming voltage signal.

Preferably, the high PF LED constant current circuit with the DIM end comprises an input rectifying and filtering circuit, a multifunctional constant current circuit and an output overvoltage protection circuit, the isolation circuit comprises an isolation auxiliary power supply circuit and a photoelectric isolation circuit,

The input end of the input rectifying and filtering circuit is connected with the mains supply, the output end is connected with the multifunctional constant current circuit,

The multifunctional constant current circuit is connected with the output overvoltage protection circuit,

The output overvoltage protection circuit is connected with the LED lamp panel,

The input end of the photoelectric isolation circuit is connected with a 1-10V-to-PWM circuit, the output end is connected with a multifunctional constant current circuit,

The input end of the isolation auxiliary power supply circuit is connected with the multifunctional constant current circuit, and the output end of the isolation auxiliary power supply circuit is connected with the 1-10V-to-PWM circuit.

Preferably, the input rectifying and filtering circuit includes a fuse F1, a capacitor CX1, a rectifier bridge BD1, a varistor VR1, a resistor R1, an inductor L1, and a capacitor C1, where an input end of the rectifier bridge BD1 is an input end of the input rectifying and filtering circuit, and is used for connecting with a mains supply, and the fuse F1 and the capacitor CX1 are a fuse and a filtering capacitor of an input end of the rectifier bridge BD1 respectively;

The piezoresistor VR1 is connected at the output of rectifier bridge BD1, and the positive pole of rectifier bridge BD 1's output is through parallelly connected resistance R1 and inductance L1 for multi-functional constant current circuit provides the power supply voltage, and the positive pole of rectifier bridge BD 1's output passes through parallelly connected resistance R1 and inductance L1 constitutes the output of input rectifier filter circuit, and electric capacity C1 is the filter capacitance of input rectifier filter circuit's output.

Preferably, the multifunctional constant current circuit comprises a resistor R2, a control chip U1, a diode D2, a resistor R4, an optocoupler U2, a capacitor C2, a resistor R5, a diode D2, a resistor R3, a capacitor C3, an inductor L2, a resistor R6, a capacitor C4 and a capacitor Y1, wherein an output end of the input rectifying and filtering circuit supplies power to a pin 4 of the control chip U1 through the resistor R2, an output end of the input rectifying and filtering circuit is also connected with an anode of the diode D1, a cathode of the diode D1 is connected with a cathode of the diode D2, an anode of the diode D2 is connected with a pin 5 of the control chip U1, pins 1 and 2 of the control chip U1 are connected with a ground wire through the capacitor C2, pins 8 are connected with a ground wire, pins 7 are connected with a ground wire through the resistor R5, and two ends of an output end of the optocoupler U2 are respectively connected with a pin 1 and a ground wire of the control chip U1;

The capacitor C3 and the resistor R3 are connected in series and then connected in parallel to two ends of the diode D2, the cathode of the diode D1 forms a positive output end VO+ of the multifunctional constant current circuit, and the anode of the diode D2 outputs a negative output end VO-of the multifunctional constant current circuit through the inductor L2, and the positive output end VO+ and the negative output end VO-are connected with the LED lamp panel;

the capacitor Y1 is a grounded capacitor of the negative output end VO-, and the capacitor C4 and the resistor R6 are both connected in parallel between the positive output end VO+ and the negative output end VO-.

Preferably, the output overvoltage protection circuit includes a resistor R7, a resistor R8, a resistor R9, a zener diode ZD1, an optocoupler U3 and a resistor R10, where the resistor R7 and the resistor R8 form a voltage division sampling circuit between the positive output terminal vo+ and the negative output terminal VO-, a connection node of the resistor R7 and the resistor R8 is connected with a cathode of the zener diode ZD1 through the resistor R9, an anode of the zener diode ZD1 is connected with an input terminal of the optocoupler U3, another input terminal of the optocoupler U3 is connected with the negative output terminal VO-, one end of an output terminal of the optocoupler U3 is connected with a ground wire, and the other end of the output terminal of the optocoupler U3 is connected with a pin 2 of the control chip U1 through the resistor R10.

Preferably, the 1-10V-to-PWM circuit includes a dimming interface conversion chip U4, an inductor L3, a diode D3, a capacitor C5, a resistor R11, a resistor R12, a resistor R13, a capacitor C6, a capacitor C7, a resistor R14, a diode D4, a capacitor C6 and a capacitor C8, where the inductor L3, the diode D3, the capacitor C5, the resistor R11, the resistor R12, the resistor R13, the capacitor C6, the capacitor C7, the resistor R14, the capacitor C6 and the capacitor C8 form a peripheral circuit of the dimming interface conversion chip U4, the 4 pin of the dimming interface conversion chip U4 is connected to an external dimmer through the diode D4, an output voltage of the external dimmer is 1-10V or 0-10V, one end of an output end of the optocoupler U2 is connected to the 2 pin of the dimming interface conversion chip U4, and the other end is connected to the 5 pin of the dimming interface conversion chip U4 through the resistor R14.

The single-ended power supply 1-10V T8 LED dimming lamp tube solves the technical problem that the 0/1-10V T8 LED lamp tube cannot solve the withstand voltage safety, is simple in circuit structure and easy to produce, skillfully solves the safety problem existing between high-voltage power supply and low-voltage dimming signals by adopting the mode that an energy storage inductor auxiliary winding takes electricity and an optocoupler is electrically isolated and transmits a control signal and a light source plate is bridged, and realizes the single-ended power supply 0/1-10V power supply T8 LED dimming lamp tube, and the circuit is simple in structure.

Drawings

FIG. 1 is a schematic diagram of a single-ended power supply 1-10V T8 LED dimming lamp tube structure;

FIG. 2 is a diagram showing the internal connection of a single-ended power supply 1-10V T8 LED dimming lamp tube;

FIG. 3 is a block diagram of a single-ended power supply 1-10V T8 LED dimming lamp driver according to the present invention;

FIG. 4 is a schematic diagram of a single-ended power supply 1-10V T8 LED dimming lamp driver according to the present invention;

In the figure: the LED constant current circuit comprises a box body 1, a circuit board 2 with a high PF and a DIM end, a circuit board 3 with a 1-10V-to-PWM circuit and a circuit board 4 of an LED lamp panel.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

1-10V T8 LED dimming lamp tube with single-ended power supply shown in fig. 1-4 comprises a high PF (power factor) LED constant current circuit with a DIM end, an LED lamp panel, an isolation circuit and a 1-10V-to-PWM (pulse width modulation) circuit, wherein the high PF LED constant current circuit with the DIM end is respectively connected with the LED lamp panel and the isolation circuit, and the 1-10V-to-PWM circuit is connected with the isolation circuit;

Two pins at one end of the lamp tube provide L, N alternating current power supply; the two pins at the other end provide 0/1-10V dimming signals, the driver is arranged in the lamp tube, and the overall structure of the lamp tube is unchanged.

After the commercial power is connected into the lamp tube, the lamp tube is internally connected to a high-PF (power factor) LED constant current circuit with a DIM end, wherein the constant current driving circuit can be composed of a high-Power Factor (PF), a non-isolated Boost, a Buck, a Boost-Buck, an isolated Flyback circuit and the like; the other end of the lamp tube is led in a 0/1-10V dimming signal by a G13 pin. The external 0/1-10V dimmer is used for controlling the lamp to realize the 0/1-10V dimming function. (the main difference between the dimming signal of 0-10V and the dimming signal of 1-10V is that the dimming signal voltage is darkest at 1V and the dimming signal is extinguished between 1V and 0V when the dimming signal voltage is dimmed of 1-10V, and the dimming signal is still bright at 1V when the dimming signal is dimmed of 0-10V until the dimming signal is completely extinguished at 0V, wherein the dimming range of 1-10V is 10% -100%, and the dimming range of 0-10V is 0% -100%). The invention samples the dimming range of 1-10V, and is more suitable for actual use habits.

The output overvoltage protection circuit is connected with the LED lamp panel,

F1 in the input rectifying and filtering circuit is an input fuse, so that the safety of the input circuit is ensured when the later-stage circuit has potential safety hazards; CX1 is a safety X capacitor which is an EMC filter capacitor; BD1 is a rectifier bridge, rectifying an input alternating current into a direct current; VR1 is a piezoresistor, and is mainly used for protecting surge voltage existing in a power grid and ensuring that a later-stage IC works in a safe voltage range; l1, C1 and VR1 form a pi-type EMI filter circuit. In the invention, the inherent capacitance of the piezoresistor VR1 is skillfully utilized, the resistance R1 is connected in parallel with the two ends of the L1 by the EMI filter circuit consisting of the L1 and the C1, the impedance of the L1 can be locally adjusted, and the specific resistance value depends on the EMI test condition.

The control chip U1 is a MOSFET.

In the embodiment, the multifunctional constant current circuit is a non-isolated step-down constant current circuit, the resistor R2 provides starting current for the built-in control chip U1, and the purpose of adding R2 is to improve the surge impact resistance of the U1 and reduce the heat of the U1 during working; the HV voltage goes through D1 to VO + to VO-, through the inductor winding L2 pin, to pin 5 of U1 (internal MOSFET Drain pole), to pin 7 of U1 (internal CS, sampling resistor sense terminal) to ground, forming a buck loop. The U1 internal MOSFET is stored in the L2 inductor when being conducted; when the MOSFET in the U1 is turned off, the electric energy stored in the inductor L2 forms a discharge loop through the diodes D2 to vo+ to the load to VO-to L2. The electrolytic capacitor C4 participates in energy storage together when the U1 MOSFET is turned on, and participates in discharging together when the U1 MOSFET is turned off, so that current ripple of a later-stage load is reduced, and stability is improved. The resistor R6 in parallel with the electrolysis C4 provides a bleed circuit when shut down. The capacitor C3 and the resistor R3 are connected in series and then connected in parallel to the two ends of the D2, so that the switching speed of the D2 is properly weakened, and the EMI test is facilitated. Capacitance Y1 is also considered to improve EMI. The capacitor C2 is a shunt capacitor of U1; the resistor R4 provides basic bias current for the optocoupler U2 (C-E) connected with the U1 pin 1 (DIM) in parallel, so that the U1 is in a maximum output power state when no dimming signal is added, and the dimming function is realized through the change of PWM signals at the U1 (C-E) end.

In the overvoltage protection circuit, if the output voltage VO+ and VO-of the circuit 7 are larger than the designed voltage value, the voltage on R8 rises in the same proportion after the voltage is divided by the resistor R7 and the resistor R8, and exceeds the set value of the voltage stabilizing tube ZD1, ZD1 is conducted, the diode on the left side of U3 (optocoupler) is conducted through the resistor R9, the triode on the right side of the optocoupler is caused to be conducted, and the pin VCC of U1 is pulled to the ground through the resistor R10; u1 stops working immediately because VCC power supply is not available, and plays a role in output overvoltage protection, and the LED load is protected to work in a set safe working voltage range.

In the 1-10V-to-PWM circuit, U4 is a dimming interface conversion chip, and can convert a 0/1-10V signal of a dimming port and a voltage signal generated by a resistance value into a PWM signal. The PWM signal can be directly used for controlling the LED driving chip or can be subjected to optical coupling isolation to realize the dimming application of the isolation application. U4 can realize the flexible adjustment of PWM frequency through external frequency setting foot. U4 can realize compatibility of various passive 0/1-10V dimmers through an external dimmer current setting pin. The U4 is internally provided with a high-voltage starting JFET, so that quick starting can be realized. Pin 1 of U4 is HV end, and provides power through auxiliary power supply; the resistor R12 is used for setting the current value of the DIM pin; resistor R13 is used to set the corresponding DIM pin voltage for the MODE pin 100% duty cycle. The capacitor C6 is used for setting PWM frequency; the capacitor C7 is a U4 VCC end bypass capacitor; capacitor C8 is the DIM leg bypass capacitor. When a 1-10V dimmer is added to the U4 pin 4 (DIM) terminal, a 10-100% duty cycle change is generated at the U4 pin 5 (OUT) terminal, and the changed duty cycle drives the optical coupler U2 (A-K) terminal through a resistor R14.

Because the multifunctional constant current source circuit is a non-isolation circuit and the 1-10V-to-PWM circuit is a low-voltage signal circuit, the two circuits must be electrically isolated to ensure the use safety. U3 implements electrical isolation and signal transmission. The method for realizing electric isolation and signal transmission also comprises an isolation transformer, however, the isolation transformer has large volume, the space for a T8 lamp tube built-in driver is very narrow, and the isolation transformer occupies large space and is not suitable for use.

In the isolation auxiliary power supply circuit, shown in fig. 2 and 3, the auxiliary power supply circuit specifically comprises an auxiliary winding of which the L2 (2-4) winding is an L2 (5-1) winding, wherein the L2 (2-4) winding is wound by three layers of insulating wires, and the leading-out pins of the auxiliary power supply circuit are isolated by a teflon sleeve, so that the requirements of safety isolation and voltage resistance of the circuit are ensured. D3 is a fast recovery rectifier diode, and after D3 rectification and C5 filtering, power is supplied to U4, resistor R11 is a discharge resistor of capacitor C5, and L2 (2-4) windings are the 2 pins and 4 pins of L2 shown in fig. 2.

Three isolation techniques are mainly used: the LED lamp panel comprises a 1-10V PWM signal conversion circuit, an isolation auxiliary power supply circuit and an LED lamp panel. As can be seen from the internal connection diagram of the single-ended power supply 1-10V T8 LED dimming lamp tube in FIG. 2, a circuit board 4 of an LED lamp panel, a circuit board 2 of a high PF (power factor) end LED constant current circuit and a circuit board 3 of a 1-10V conversion PWM (pulse Width modulation) circuit are arranged in a box body 1, the box body 1 adopts materials which can be glass, full plastic and nanometer, and three circuits of the 1-10V conversion PWM circuit, a photoelectric isolation circuit and an isolation auxiliary power supply circuit are ingeniously formed by the lamp panel, so that the three circuits are organically integrated together. As can be seen from fig. 2, the circuit board 4 of the LED lamp panel adopts an FR-4 double-sided board, and LED lamp beads such as 1,2 … n-1, n are placed on the element surface; the drivers C-E are connected to a PWM conversion circuit at a later stage through a lamp panel in a connector or direct welding connection mode; the inductor L2 (2-4) winding is led to the No. 2-4 bonding pad of the subsequent stage at the welding surface of the lamp panel (the connection relation of the welding surface is represented by a blue dotted line). The voltage-resistant parallel layer (with the thickness of more than or equal to 0.5 mm) of the FR-4PCB material is 35KV minimum, so that the use requirement of AC 3750V is completely met, the technical problem that the voltage-resistant safety of the 0/1-10V T8 LED lamp cannot be solved is solved, the circuit is simple in structure and easy to produce, the safety problem existing between high-voltage power supply and low-voltage dimming signals is ingeniously solved through the mode that an energy storage inductor auxiliary winding is used for taking power, an optocoupler is used for photoelectrically isolating transmission control signals and a light source plate is bridged, and the single-end power supply 0/1-10V power supply T8 LED dimming lamp is realized.

In the present invention, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiment of the present invention.

Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.

It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.

Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. A single-ended power supply 1-10V T8 LED dimming lamp tube is characterized in that: the high PF LED constant current circuit with the DIM end is respectively connected with the LED lamp panel and the isolation circuit, and the 1-10V PWM circuit is connected with the isolation circuit;

The high PF (power factor) LED constant current circuit with a DIM end is externally connected with a mains supply, and the 1-10V-to-PWM (pulse-Width modulation) circuit is externally connected with a dimming signal;

the high PF LED constant current circuit with the DIM end comprises an input rectifying and filtering circuit, a multifunctional constant current circuit and an output overvoltage protection circuit;

The input rectifying and filtering circuit comprises a fuse F1, a capacitor CX1, a rectifying bridge BD1, a piezoresistor VR1, a resistor R1, an inductor L1 and a capacitor C1, wherein the input end of the rectifying bridge BD1 is the input end of the input rectifying and filtering circuit and is used for being connected with mains supply, and the fuse F1 and the capacitor CX1 are the fuse and the filtering capacitor of the input end of the rectifying bridge BD1 respectively;

The voltage dependent resistor VR1 is connected to the output end of the rectifying bridge BD1, the positive electrode of the output end of the rectifying bridge BD1 provides power supply voltage for the multifunctional constant current circuit through a resistor R1 and an inductor L1 which are connected in parallel, namely, the positive electrode of the output end of the rectifying bridge BD1 forms the output end of the input rectifying and filtering circuit through the resistor R1 and the inductor L1 which are connected in parallel, and the capacitor C1 is a filtering capacitor of the output end of the input rectifying and filtering circuit;

The multifunctional constant current circuit comprises a resistor R2, a control chip U1, a diode D2, a resistor R4, an optocoupler U2, a capacitor C2, a resistor R5, a diode D2, a resistor R3, a capacitor C3, an inductor L2, a resistor R6, a capacitor C4 and a capacitor Y1, wherein the output end of the input rectifying and filtering circuit supplies power for the 4 pins of the control chip U1 through the resistor R2, the output end of the input rectifying and filtering circuit is also connected with the positive electrode of the diode D1, the negative electrode of the diode D1 is connected with the negative electrode of the diode D2, the positive electrode of the diode D2 is connected with the 5 pins of the control chip U1, the resistor R4 and the 2 pins are connected with the ground wire through the capacitor C2, the 8 pins are connected with the ground wire, the 7 pins are connected with the ground wire through the resistor R5, and the two ends of the output end of the optocoupler U2 are respectively connected with the 1 pin and the ground wire of the control chip U1;

The capacitor Y1 is a grounded capacitor of the negative output end VO-, and the capacitor C4 and the resistor R6 are both connected in parallel between the positive output end VO+ and the negative output end VO-;

the output overvoltage protection circuit comprises a resistor R7, a resistor R8, a resistor R9, a voltage stabilizing diode ZD1, an optocoupler U3 and a resistor R10, wherein the resistor R7 and the resistor R8 form a voltage division sampling circuit between the positive output end VO+ and the negative output end VO-, a connecting node of the resistor R7 and the resistor R8 is connected with the negative electrode of the voltage stabilizing diode ZD1 through the resistor R9, the positive electrode of the voltage stabilizing diode ZD1 is connected with one input end of the optocoupler U3, the other input end of the optocoupler U3 is connected with the negative output end VO-, one end of the output end of the optocoupler U3 is connected with a ground wire, and the other end of the output end of the optocoupler U3 is connected with the 2 pin of the control chip U1 through the resistor R10;

The 1-10V changes PWM circuit and includes dimming interface conversion chip U4, inductance L3, diode D3, electric capacity C5, resistance R11, resistance R12, resistance R13, electric capacity C6, electric capacity C7, resistance R14, diode D4, electric capacity C6 and electric capacity C8, inductance L3, diode D3, electric capacity C5, resistance R11, resistance R12, resistance R13, electric capacity C6, electric capacity C7, resistance R14, electric capacity C6 and electric capacity C8 constitute dimming interface conversion chip U4's peripheral circuit, dimming interface conversion chip U4's 4 foot passes through diode D4 and connects external light modulator, external light modulator's output voltage is 1-10V or 0-10V, dimming interface conversion chip U4's 2 foot is connected to one end of the output of opto-coupler U2, dimming interface conversion chip U4's 5 foot is connected through resistance R14 to the other end.

2. The single-ended power supply 1-10v T8 LED dimming tube of claim 1, wherein: the high PF (power factor) LED constant current circuit with the DIM end comprises a non-isolated Boost circuit, a Buck circuit, a Boost-Buck circuit or an isolated Flyback circuit.

3. The single-ended power supply 1-10v T8 LED dimming tube of claim 1, wherein: the LED lamp panel comprises a plurality of LED lamp beads, and the LED lamp beads are connected in a full series or mixed connection of series and parallel.

4. The single-ended power supply 1-10v T8 LED dimming tube of claim 1, wherein: the dimming signal is a 0-10V dimming voltage signal or a 1-10V dimming voltage signal.

5. The single-ended power supply 1-10v T8 LED dimming tube of claim 1, wherein: the isolation circuit comprises an isolation auxiliary power supply circuit and a photoelectric isolation circuit,

The output overvoltage protection circuit is connected with the LED lamp panel,