CN214799962U

CN214799962U - Simulation dimming drive circuit of LED lamp tube

Info

Publication number: CN214799962U
Application number: CN202120829590.4U
Authority: CN
Inventors: 徐泉江; 高君阳; 王利彬; 李阳
Original assignee: Zhejiang Yankon Group Co Ltd; Zhejiang Yankon Mega Lighting Co Ltd
Current assignee: Zhejiang Yankon Group Co Ltd; Zhejiang Yankon Mega Lighting Co Ltd; Zhejiang Yangguang Meijia Lighting Co Ltd
Priority date: 2021-04-21
Filing date: 2021-04-21
Publication date: 2021-11-19
Anticipated expiration: 2031-04-21

Abstract

A simulation dimming drive circuit of an LED lamp tube belongs to the technical field of LED lamp tubes. The utility model discloses a rectifier circuit, drive circuit and dimmer circuit, rectifier circuit is coupled in the commercial power, drive circuit is coupled in rectifier circuit and LED fluorescent tube, dimmer circuit is coupled in rectifier circuit and drive circuit, rectifier circuit rectifies the commercial power into the direct current, drive circuit converts the direct current to output to the LED fluorescent tube after required voltage of LED fluorescent tube or the electric current, dimmer circuit changes benchmark supply voltage value through adjusting variable resistance, make corresponding electric current of drive circuit output give the LED fluorescent tube, realize that the LED fluorescent tube adjusts luminance. The utility model discloses set up step-down voltage stabilizing circuit in dimmer circuit for when different commercial power outputs, the bleeder circuit input that can both make among the dimmer circuit maintains at benchmark supply voltage value, thereby has widened the range of application of LED fluorescent tube.

Description

Simulation dimming drive circuit of LED lamp tube

Technical Field

The utility model belongs to the technical field of the LED fluorescent tube, specifically relate to a simulation drive circuit that adjusts luminance of LED fluorescent tube.

Background

The traditional American standard built-in driving LED lamp tube is generally supplied with power by non-dimming 120-277V, and has single brightness because dimming cannot be realized. To realize the dimming function of the LED lamp tube, a dimmer is mostly needed to be used for wireless or wired adjustment. Wireless regulation requires high costs; the wired dimming mode generally comprises TRIAC dimming and 0-10V dimming, the TRIAC dimming generally has good effect only by dimming in a single voltage range, and the 120-class 277V wide voltage dimming cannot be compatible; the dimming of 0-10V requires 2 more signal lines due to the dimming characteristic, and the traditional LED lamp tube structure cannot meet the requirement. With the release of the new american LED lamp DLC5.1, the existing LED lamp needs to satisfy the function of continuous dimming, so many manufacturers have designed LED lamps with dimming function, but dimming of such LED lamps often needs to be used with a dimmer, resulting in higher cost, and often only applicable to a single voltage, resulting in a narrower application range.

Disclosure of Invention

The utility model discloses solve the technical problem that above-mentioned prior art exists, provide a simulation drive circuit that adjusts luminance of LED fluorescent tube.

The above technical problem of the present invention can be solved by the following technical solutions: the utility model provides a simulation drive circuit that adjusts luminance of LED fluorescent tube, includes rectifier circuit, drive circuit and dimming circuit, rectifier circuit coupling is in the commercial power, drive circuit coupling is in rectifier circuit and LED fluorescent tube, dimming circuit coupling is in rectifier circuit and drive circuit, rectifier circuit rectifies the commercial power into the direct current, drive circuit converts the direct current into the required voltage of LED fluorescent tube or current after export to the LED fluorescent tube, dimming circuit changes the benchmark supply voltage value through adjusting the variable resistance, makes drive circuit output corresponding current for the LED fluorescent tube, realizes that the LED fluorescent tube adjusts luminance.

Preferably, the dimming circuit comprises a voltage reduction and stabilization circuit and a voltage division circuit.

Preferably, the voltage reduction and stabilization circuit is a resistance voltage reduction and stabilization tube voltage stabilization circuit and comprises a resistor R1, a voltage stabilization diode ZD and a capacitor C4, one end of the resistor R1 is connected with the output end of the rectification circuit, the other end of the resistor R1 is respectively connected with the cathode of the voltage stabilization diode ZD and the input end of the voltage division circuit, the anode of the voltage stabilization diode ZD is grounded, and the capacitor C4 is connected with the voltage stabilization diode ZD in parallel.

Preferably, the buck voltage stabilizing circuit is an LDO buck voltage stabilizing circuit, and includes a resistor R1 and a three-terminal regulator chip, one end of the resistor R1 is connected to the output end of the rectifier circuit, the other end of the resistor R1 is connected to a first pin of the three-terminal regulator chip, a second pin of the three-terminal regulator chip is grounded, and a third pin of the three-terminal regulator chip is connected to the input end of the voltage divider circuit.

Preferably, the voltage divider circuit comprises a resistor R2, a variable resistor R3 and a capacitor C5, one end of the resistor R2 is connected to an input end of the voltage reduction and stabilization circuit, the other end of the resistor R2 is respectively connected to one end of the variable resistor R3 and one end of the driver circuit and one end of the capacitor C5, and the other end of the variable resistor R3 and the other end of the capacitor C5 are both grounded.

Preferably, the other end of the variable resistor R3 is connected in series with the resistor R4 and is grounded through a resistor R4.

Preferably, when the LED lamp tube is powered by two terminals, a leakage detection circuit is coupled between the dimming circuit and the rectifying circuit, an input terminal of the dimming circuit is connected to the leakage detection circuit, the leakage detection circuit provides a reference power supply voltage, and the dimming circuit is a voltage division circuit.

Preferably, the adjusting switch of the variable resistor is mounted on the end of the LED lamp tube.

Preferably, the driving circuit is one of a BUCK circuit, a BOOST circuit and a BUCK-BOOST circuit.

The utility model discloses beneficial effect who has: the utility model changes the reference power supply voltage input to the driving circuit by adjusting the resistance value of the variable resistor, so that the driving circuit outputs corresponding current to the LED lamp tube, thereby realizing the simulation dimming of the LED lamp tube; meanwhile, the voltage reduction and stabilization circuit is arranged in the dimming circuit, so that the input end of a voltage division circuit in the dimming circuit can be maintained at a reference power supply voltage value when different mains supplies are output, and the application range of the LED lamp tube is widened. The utility model has the advantages that the adjusting switch of the variable resistor is arranged on the end of the LED lamp tube, so that the variable resistor can be conveniently adjusted; the utility model discloses saved the dimmer, the cost is reduced.

Drawings

Fig. 1 is a block circuit diagram of the present invention;

FIG. 2 is a circuit diagram of a voltage stabilizing circuit of a voltage stabilizing resistor;

FIG. 3 is a circuit diagram of the LDO buck regulator circuit of the present invention;

fig. 4 is a circuit block diagram of the LED lamp tube of the present invention supplying power to both ends;

fig. 5 is a circuit diagram of the LED lamp of the present invention supplying power to both ends;

fig. 6 is a schematic structural diagram of the LED lamp of the present invention.

In the figure: 1. a rectifying circuit; 2. a drive circuit; 3. a dimming circuit; 4. an LED lamp tube; 5. a voltage reduction and stabilization circuit; 6. a voltage dividing circuit; 7. a leakage detection circuit; 8. and adjusting the switch.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.

Example (b): a simulation dimming driving circuit of an LED lamp tube is shown in figures 1-6 and comprises a rectifying circuit 1, a driving circuit 2 and a dimming circuit 3, wherein the rectifying circuit 1 is coupled with commercial power, the driving circuit 2 is coupled with the rectifying circuit 1 and the LED lamp tube 4, the dimming circuit 3 is coupled with the rectifying circuit 1 and the driving circuit 2, the rectifying circuit 1 rectifies the commercial power into direct current, the driving circuit 2 converts the direct current into voltage or current required by the LED lamp tube 4 and then outputs the voltage or current to the LED lamp tube 4, and the dimming circuit 3 changes a reference power supply voltage value by adjusting a variable resistor, so that the driving circuit 2 outputs corresponding current to the LED lamp tube 4, and dimming of the LED lamp tube 4 is realized.

The dimming circuit 3 comprises a voltage reduction and voltage stabilization circuit 5 and a voltage division circuit 6, and the voltage reduction and voltage stabilization circuit 5 can adopt a resistance voltage reduction and voltage stabilization tube voltage stabilization circuit or an LDO voltage reduction and voltage stabilization circuit.

When the voltage reduction and stabilization circuit 5 is a resistance voltage reduction and stabilization tube voltage stabilization circuit, the voltage reduction and stabilization circuit comprises a resistor R1, a voltage stabilization diode ZD and a capacitor C4, one end of the resistor R1 is connected with the output end of the rectification circuit 1, the other end of the resistor R1 is respectively connected with the cathode of the voltage stabilization diode ZD and the input end of the voltage division circuit 6, the anode of the voltage stabilization diode ZD is grounded, and the capacitor C4 is connected with the voltage stabilization diode ZD in parallel.

When the voltage reduction and stabilization circuit 5 is an LDO voltage reduction and stabilization circuit, the voltage reduction and stabilization circuit comprises a resistor R1 and a three-terminal voltage stabilization chip (i.e., an LDO), the three-terminal voltage stabilization chip is provided with 3 pins, one end of the resistor R1 is connected with the output end of the rectification circuit 1, the other end of the resistor R1 is connected with the first pin of the three-terminal voltage stabilization chip, the second pin of the three-terminal voltage stabilization chip is grounded, and the third pin of the three-terminal voltage stabilization chip is connected with the input end of the voltage division circuit 6.

The voltage division circuit 6 comprises a resistor R2, a variable resistor R3 and a capacitor C5, one end of the resistor R2 is connected with an input end of the voltage reduction and stabilization circuit 5, namely an input end of the voltage reduction and stabilization circuit of the resistor voltage reduction and stabilization tube or an input end of the LDO voltage reduction and stabilization circuit, the other end of the resistor R2 is respectively connected with one end of a variable resistor R3, a dimming pin of a driving chip in the driving circuit 2 and one end of a capacitor C5, and the other end of the variable resistor R3 and the other end of the capacitor C5 are both grounded. If necessary, a resistor R4 may be connected in series with the other end of the variable resistor R3, and grounded through a resistor R4.

Because the voltage reduction and stabilization circuit 5 is added in the dimming circuit 3, the voltage can be stabilized at the reference supply voltage value no matter the commercial power is 120V or 277V. At this time, one of the two paths of commercial power (alternating current 120V-277V) is rectified by the rectifying circuit 1 and then output to the dimming circuit 3, the reference supply voltage is output to the voltage dividing circuit 6 after passing through the voltage reduction and stabilization circuit 5 in the dimming circuit 3, and the voltage value input to the driving chip of the driving circuit 2 is changed by adjusting the resistance value of the variable resistor R3, so that the driving circuit 2 outputs corresponding current to the LED lamp tube 4, and dimming of the LED lamp tube 4 is realized.

The LED tube 4 can be powered by two terminals or by one terminal, and when the LED tube 4 is powered by two terminals, a leakage detecting circuit 7 can be coupled between the dimming circuit 3 and the rectifying circuit 1. When one end of the LED lamp tube 4 is connected with electricity, the electric leakage detection circuit 7 is arranged, so that the electric shock risk generated when a human hand contacts the other end of the LED lamp tube 4 can be prevented. The input end of the dimming circuit 3 is connected with the leakage detection circuit 7 and is connected with the output end of the rectification circuit 1 through the leakage detection circuit 7. The leakage detection circuit 7 may be configured to provide a reference supply voltage, and the dimming circuit 3 may be the voltage division circuit 6, and the voltage reduction and stabilization circuit 5 may not be added.

The adjusting switch 8 of the variable resistor is arranged on the end of the LED lamp tube 4, the resistance value of the variable resistor is adjusted by the adjusting switch 8, and the voltage value input to the driving chip of the driving circuit 2 is changed, so that the driving circuit 2 outputs corresponding current to the LED lamp tube 4, the brightness adjustment of the LED lamp tube 4 is realized, the LED lamp tube 4 does not need to be matched with a corresponding dimmer, and the cost is reduced.

The driving circuit 2 may be one of a BUCK circuit, a BOOST circuit, and a BUCK-BOOST circuit.

To sum up, the utility model changes the reference supply voltage input to the driving circuit by adjusting the resistance value of the variable resistor, so that the driving circuit outputs corresponding current to the LED lamp tube, thereby realizing the simulation dimming of the LED lamp tube; meanwhile, the voltage reduction and stabilization circuit is arranged in the dimming circuit, so that the input end of a voltage division circuit in the dimming circuit can be maintained at a reference power supply voltage value when different mains supplies are output, and the application range of the LED lamp tube is widened. The utility model has the advantages that the adjusting switch of the variable resistor is arranged on the end of the LED lamp tube, so that the variable resistor can be conveniently adjusted; the utility model discloses saved the dimmer, the cost is reduced.

Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above-described embodiments, and many modifications are possible. Any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should be considered as belonging to the protection scope of the present invention.

Claims

1. The utility model provides a simulation drive circuit that adjusts luminance of LED fluorescent tube, includes rectifier circuit, drive circuit and dimming circuit, its characterized in that, rectifier circuit coupling is in the commercial power, drive circuit coupling is in rectifier circuit and LED fluorescent tube, dimming circuit coupling is in rectifier circuit and drive circuit, rectifier circuit rectifies the commercial power into the direct current, drive circuit converts the direct current into the required voltage of LED fluorescent tube or electric current after export to the LED fluorescent tube, dimming circuit changes the benchmark supply voltage value through adjusting variable resistance, makes drive circuit output corresponding electric current for the LED fluorescent tube, realizes that the LED fluorescent tube adjusts luminance.

2. The analog dimming driving circuit of an LED lamp of claim 1, wherein the dimming circuit comprises a buck regulator circuit and a voltage divider circuit.

3. The analog dimming driving circuit of the LED lamp according to claim 2, wherein the step-down voltage stabilizing circuit is a resistance step-down voltage stabilizing circuit, and comprises a resistor R1, a zener diode ZD and a capacitor C4, one end of the resistor R1 is connected to the output end of the rectifying circuit, the other end of the resistor R1 is connected to the negative electrode of the zener diode ZD and the input end of the voltage dividing circuit, respectively, the positive electrode of the zener diode ZD is grounded, and the capacitor C4 is connected in parallel with the zener diode ZD.

4. The analog dimming driving circuit of an LED lamp of claim 2, wherein the buck regulator circuit is an LDO buck regulator circuit, and comprises a resistor R1 and a three-terminal regulator chip, one terminal of the resistor R1 is connected to the output terminal of the rectifier circuit, the other terminal of the resistor R1 is connected to the first pin of the three-terminal regulator chip, the second pin of the three-terminal regulator chip is connected to ground, and the third pin of the three-terminal regulator chip is connected to the input terminal of the voltage divider circuit.

5. The analog dimming driving circuit of an LED lamp of claim 2, wherein the voltage divider circuit comprises a resistor R2, a variable resistor R3 and a capacitor C5, one end of the resistor R2 is connected to the input end of the voltage reduction and stabilization circuit, the other end of the resistor R2 is connected to one end of a variable resistor R3, one end of the driving circuit and one end of a capacitor C5, and the other end of the variable resistor R3 and the other end of the capacitor C5 are both grounded.

6. The analog dimming driving circuit of an LED lamp tube of claim 5, wherein the other end of the variable resistor R3 is connected in series with a resistor R4 and is grounded through a resistor R4.

7. The analog dimming driving circuit of an LED lamp according to claim 2, wherein when the LED lamp is powered by two terminals, a leakage detection circuit is coupled between the dimming circuit and the rectifying circuit, an input terminal of the dimming circuit is connected to the leakage detection circuit, the leakage detection circuit provides a reference power supply voltage, and the dimming circuit is a voltage divider circuit.

8. The analog dimming driving circuit of an LED lamp of claim 1, wherein the adjustment switch of the variable resistor is installed at the end of the LED lamp.

9. The analog dimming driving circuit of an LED lamp of claim 1, wherein the driving circuit is one of a BUCK circuit, a BOOST circuit, and a BUCK-BOOST circuit.