CN218456548U - LED lamp tube, PCB and control circuit - Google Patents
LED lamp tube, PCB and control circuit Download PDFInfo
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- CN218456548U CN218456548U CN202222249347.2U CN202222249347U CN218456548U CN 218456548 U CN218456548 U CN 218456548U CN 202222249347 U CN202222249347 U CN 202222249347U CN 218456548 U CN218456548 U CN 218456548U
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Abstract
The utility model discloses a LED lamp tube, a PCB board and a control circuit, wherein the control circuit comprises a rectifying and filtering unit, a control unit and an output filtering part; the control unit comprises a first control chip U1, a boosting part and an adjusting part; the input end of the rectifying and filtering unit is used for being connected with an external power supply device, the output end of the rectifying and filtering unit is respectively connected with the pin 1 of the first control chip U1 and the output end of the regulating part, the pin 7 of the first control chip U1 is connected with the input end of the regulating part, the pin 5 of the first control chip U1 and the output end of the regulating part are respectively connected with the input end of the boosting part, the output end of the boosting part is connected with the input end of the output filtering part, and the boosting part is used for outputting working current; the utility model discloses a control circuit of LED fluorescent tube reduces input loss and output loss respectively through rectification filter unit and output filter part, can effectively reduce the loss of LED fluorescent tube during operation.
Description
Technical Field
The utility model relates to a lighting device technical field, in particular to LED fluorescent tube, PCB board and control circuit.
Background
In the field of illumination, LED illumination has shown its wide application prospect due to its advantages of high light efficiency, long life, and low cost; in an increasing number of application scenarios, it is more desirable to replace fluorescent lamps as conventional light sources with LED light sources.
In the prior art, a technology for driving an LED by using an electronic ballast exists, and the technical scheme is that a high-frequency alternating voltage output by the electronic ballast is rectified, filtered and adjusted into a constant current meeting the driving of the LED by using a linear voltage regulating circuit; the scheme comprises a high-frequency current-limiting circuit, a rectifying and filtering circuit, an initial voltage stabilizing circuit and a constant current driving circuit; however, there are many power conversion links in this scheme, which results in problems such as high work loss and low work efficiency of the LED lamp tube, and too high work loss of the LED lamp tube means that the operating temperature of the LED lamp tube is high, which is easy to shorten the service life of circuit components, and the LED lamp tube still has hidden troubles of safety in use during the installation process.
It is seen that improvements and enhancements in the prior art are needed.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned prior art's weak point, the utility model aims to provide a control circuit of LED fluorescent tube reduces input loss and output loss respectively through rectification filter unit and output filter part, can effectively reduce the loss of LED fluorescent tube during operation.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a control circuit of an LED lamp tube comprises a rectifying and filtering unit, a control unit and an output filtering part; the control unit comprises a first control chip U1, a boosting part and an adjusting part; the input end of the rectifying and filtering unit is used for being connected with an external power supply device, the output end of the rectifying and filtering unit is respectively connected with the pin 1 of the first control chip U1 and the output end of the adjusting part, the pin 7 of the first control chip U1 is connected with the input end of the adjusting part, the pin 5 of the first control chip U1 and the output end of the adjusting part are respectively connected with the input end of the boosting part, the output end of the boosting part is connected with the input end of the output filtering part, and the boosting part is used for outputting working current.
In the control circuit of the LED lamp tube, the control unit further comprises a first protection part, an output current setting part and a second protection part; the input end of the first protection part is connected with the output end of the rectification filter unit, and the output end of the first protection part is connected with a pin 1 of the first control chip U1; the output current setting part is connected with a pin 4 of the first control chip U1; the second protection part is connected with a pin 2 of the first control chip U1.
In the control circuit of the LED lamp tube, the first protection part comprises a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5; one end of the second resistor R2 is connected with the output end of the rectification filtering unit, the other end of the second resistor R2 is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of the fourth resistor R4, the other end of the fourth resistor R4 and one end of the fifth resistor R5 are respectively connected with the pin 1 of the first control chip U1, and the other end of the fifth resistor R5 is grounded; the output current setting part comprises a seventh resistor R7 and an eighth resistor R8, one end of the seventh resistor R7 and one end of the eighth resistor R8 are respectively connected with the pin 4 of the first control chip U1, and the other end of the seventh resistor R7 and the other end of the eighth resistor R8 are respectively grounded; the second protection part comprises a sixth resistor R6, one end of the sixth resistor R6 is connected with the pin 2 of the first control chip U1, and the other end of the sixth resistor R6 is grounded.
In the control circuit of the LED lamp tube, the boosting part comprises a first diode D1, a third capacitor C3, a second diode D2 and a first transformer T1, the anode of the second diode D2 and the pin 1 of the first transformer T1 are respectively connected with the pin 5 of the first control chip U1, and the pin 2 of the first transformer T1 is respectively connected with one end of the third capacitor C3 and the anode of the first diode D1; the anode of the first diode D1 is also connected with the output end of the adjusting part; the other end of the third capacitor C3 is connected to the cathode of the first diode D1, and the cathode of the first diode D1 is used for outputting current; and the cathode of the second diode D2 is connected with the output filtering part.
In the control circuit of the LED lamp tube, the output filter part includes a fourth capacitor C4, one end of the fourth capacitor C4 is connected to the negative electrode of the second diode D2, and the other end of the fourth capacitor C4 is grounded.
In the control circuit of the LED lamp tube, the adjusting part comprises a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a third diode D3, a first voltage-regulator tube ZD1 and a seventh capacitor C7; one end of the eleventh resistor R11 and one end of the ninth resistor R9 are respectively connected to the output end of the rectifying and filtering unit and the input end of the voltage boosting unit; the other end of the eleventh resistor R11 is connected to one end of the twelfth resistor R12, and the other end of the ninth resistor R9 is connected to one end of the tenth resistor R10; the other end of the tenth resistor R10 is connected to the anode of the third diode D3, the cathode of the first voltage regulator tube ZD1, and one end of the seventh capacitor C7, respectively; the other end of the twelfth resistor R12 and the cathode of the third diode D3 are respectively connected with a pin 7 of the first control chip U1; the anode of the first voltage regulator tube ZD1 and the other end of the seventh capacitor C7 are grounded respectively.
In the control circuit of the LED lamp tube, the rectification and filtering unit comprises a filtering part, a rectifying part and an energy storage part, the input end of the filtering part is used for being connected with an external power supply device, the output end of the filtering part is connected with the input end of the rectifying part, and the output end of the rectifying part is respectively connected with the input end of the energy storage part, the pin 1 of the first control chip U1 and the output end of the adjusting part.
In the control circuit of the LED lamp tube, the filtering part comprises a first capacitor C1, a first inductor L1, a first resistor R1 and an adjustable resistor VR1, and the first capacitor C1 is used for being connected with an external power supply device; the rectifying part comprises a rectifying bridge BR1; the energy storage part comprises a second capacitor C2; one end of the first capacitor C1 is further connected to one end of the first inductor L1 and one end of the first resistor R1, and the other end of the first inductor L1 and the other end of the first resistor R1 are respectively connected to one end of the adjustable resistor VR1 and the pin 3 of the rectifier bridge BR1; the other end of the first capacitor C1 is also connected with the other end of the adjustable resistor VR1 and a pin 4 of the rectifier bridge BR1; pin 1 of rectifier bridge BR1 respectively with the one end of second electric capacity C2, pin 1 of first control chip U1 and the output of regulating part is connected, pin 2 of rectifier bridge BR1 and the other end of second electric capacity C2 ground connection respectively.
The utility model also correspondingly discloses a PCB board, it is as above arbitrary to print on the PCB board the control circuit of LED fluorescent tube.
The utility model also correspondingly discloses a LED fluorescent tube, include the casing and set up the lamp plate in the casing, still be provided with as above in the casing PCB board, PCB board with lamp plate electric connection.
Has the advantages that:
the utility model provides a control circuit of LED lamp tube, a rectifying and filtering unit is used for filtering clutter signals of input voltage and converting alternating voltage into direct voltage, which can effectively reduce input loss; the direct-current voltage output by the rectifying and filtering unit is input to the control unit, the regulating part can automatically regulate the power supply current, the power supply loss is effectively reduced, the voltage can be increased by the voltage increasing part, and the output current is ensured to be kept at a lower value so as to reduce the working energy consumption of the LED lamp tube; the output filtering part is used for reducing output ripples, so that the output loss can be effectively reduced; therefore, the control circuit disclosed by the application has the advantages of low working loss, high safety degree during working and long service life.
Drawings
Fig. 1 is a circuit structure diagram of a control circuit of an LED lamp tube provided by the present invention.
Description of the main element symbols: 1-a rectifying and filtering unit, 11-an energy storage part, 21-a regulating part, 22-a boosting part, 23-a first protection part, 24-an output current setting part, 25-a second protection part and 3-an output filtering part.
Detailed Description
The utility model provides a LED fluorescent tube, PCB board and control circuit, for making the utility model discloses a purpose, technical scheme and effect are clearer, make clear and definite, and it is right that the following refers to the drawing and the embodiment is lifted the utility model discloses do further detailed description.
In the description of the present invention, it should be understood that the terms "mounted," "connected," and the like are used in a broad sense, and those skilled in the art can understand the specific meaning of the terms in the present invention according to specific situations.
Referring to fig. 1, the present invention provides a control circuit for an LED lamp, which includes a rectifying and filtering unit 1, a control unit and an output filtering unit 3; the control unit comprises a first control chip U1, a boosting part 22 and a regulating part 21; the input end of the rectifying and filtering unit 1 is used for connecting an external power supply device, the output end of the rectifying and filtering unit 1 is respectively connected with the pin 1 of the first control chip U1 and the output end of the adjusting part 21, the pin 7 of the first control chip U1 is connected with the input end of the adjusting part 21, the pin 5 of the first control chip U1 and the output end of the adjusting part 21 are respectively connected with the input end of the voltage boosting part 22, the output end of the voltage boosting part 22 is connected with the input end of the output filtering part 3, and the voltage boosting part 22 is used for outputting working current; in one embodiment, the first control chip U1 is a high-efficiency driving chip integrated with a COOL MOS, and the advanced gate driving and high-voltage power supply mode is adopted, so that the high-efficiency driving chip operates in a current critical continuous mode, the working loss of the chip can be effectively reduced, and the working efficiency of the control circuit can be improved.
When the control circuit of the LED lamp tube disclosed by the application works actually, the external power supply device provides 120-240V alternating current input voltage, and the rectifying and filtering unit 1 is used for filtering clutter signals of the input voltage and converting the alternating current voltage into direct current voltage, so that the input loss can be effectively reduced; the direct-current voltage output by the rectifying and filtering unit 1 is input to the control unit, the first control chip U1 outputs a control signal to the regulating part 21 and the boosting part 22 according to the input voltage signal, the regulating part 21 can automatically regulate the power supply current when the input voltage changes, the power supply loss is effectively reduced, the boosting part 22 can boost the voltage, and the output current is ensured to be kept at a lower value, such as 25mA, so that the working energy consumption of the LED lamp tube is reduced; the output filtering part 3 is used for reducing output ripples, so that the output loss can be effectively reduced; therefore, the control circuit disclosed by the application has the advantages of low working loss, low working temperature, high working safety, high working efficiency and long service life.
Further, the control unit further includes a first protection section 23, an output current setting section 24, and a second protection section 25; the input end of the first protection part 23 is connected with the output end of the rectification filter unit 1, and the output end of the first protection part 23 is connected with a pin 1 of the first control chip U1; the output current setting part 24 is connected with a pin 4 of the first control chip U1; the second protection part 25 is connected with a pin 2 of the first control chip U1; the first protection part 23 is an OVP protection circuit, and can effectively reduce the energy consumption of the control circuit during standby; the output current setting part 24 is used for ensuring that the output current of the control circuit is constant; the second protection portion 25 is used for setting a system over-temperature protection point so as to improve the stability of the control circuit during operation.
Further, the first protection portion 23 includes a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5; one end of the second resistor R2 is connected with the output end of the rectifying and filtering unit 1, the other end of the second resistor R2 is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of the fourth resistor R4, the other end of the fourth resistor R4 and one end of the fifth resistor R5 are respectively connected with the pin 1 of the first control chip U1, and the other end of the fifth resistor R5 is grounded; the output current setting unit 24 includes a seventh resistor R7 and an eighth resistor R8, one end of the seventh resistor R7 and one end of the eighth resistor R8 are connected to the pin 4 of the first control chip U1, respectively, and the other end of the seventh resistor R7 and the other end of the eighth resistor R8 are grounded, respectively; the second protection portion 25 includes a sixth resistor R6, one end of the sixth resistor R6 is connected to the pin 2 of the first control chip U1, and the other end of the sixth resistor R6 is grounded.
Further, the voltage boosting part 22 includes a first diode D1, a third capacitor C3, a second diode D2 and a first transformer T1, an anode of the second diode D2 and a pin 1 of the first transformer T1 are respectively connected to a pin 5 of the first control chip U1, and a pin 2 of the first transformer T1 is respectively connected to one end of the third capacitor C3 and an anode of the first diode D1; the anode of the first diode D1 is also connected to the output end of the adjusting part 21; the other end of the third capacitor C3 is connected to the cathode of the first diode D1, and the cathode of the first diode D1 is used for outputting current; the cathode of the second diode D2 is connected to the output filter unit 3; the boosting part 22 can boost the dc voltage output by the rectifying and filtering unit 1 to about 400V to ensure that the output current is about 25mA.
Further, the output filter part 3 includes a fourth capacitor C4, one end of the fourth capacitor C4 is connected to the cathode of the second diode D2, and the other end of the fourth capacitor C4 is grounded; in one embodiment, the fourth capacitor C4 is an output filter point de-capacitance, and a high-frequency low-resistance capacitor may be used to reduce the operating loss of the output filter portion 3.
Further, the adjusting part 21 includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a third diode D3, a first voltage regulator ZD1, and a seventh capacitor C7; one end of the eleventh resistor R11 and one end of the ninth resistor R9 are respectively connected to the output end of the rectifying and filtering unit 1 and the input end of the voltage boosting part 22; the other end of the eleventh resistor R11 is connected to one end of the twelfth resistor R12, and the other end of the ninth resistor R9 is connected to one end of the tenth resistor R10; the other end of the tenth resistor R10 is connected to the anode of the third diode D3, the cathode of the first voltage regulator tube ZD1, and one end of the seventh capacitor C7, respectively; the other end of the twelfth resistor R12 and the cathode of the third diode D3 are respectively connected with a pin 7 of the first control chip U1; the anode of the first voltage regulator tube ZD1 and the other end of the seventh capacitor C7 are grounded respectively.
Further, the rectifying and filtering unit 1 includes a filtering portion, a rectifying portion and an energy storage portion 11, an input end of the filtering portion is used for connecting an external power supply device, an output end of the filtering portion is connected with an input end of the rectifying portion, and an output end of the rectifying portion is respectively connected with an input end of the energy storage portion 11, a pin 1 of the first control chip U1 and an output end of the adjusting portion 21; the filtering part is used for filtering clutter signals contained in the input voltage so as to reduce input loss; the rectifying part is used for converting alternating-current voltage into direct-current voltage; the energy storage part 11 is used for reducing the fluctuation of the input voltage so as to improve the working efficiency of the control circuit.
Further, the filtering part includes a first capacitor C1, a first inductor L1, a first resistor R1, and an adjustable resistor VR1, where the first capacitor C1 is used to connect an external power supply device; the rectifying part comprises a rectifying bridge BR1; the energy storage part 11 comprises a second capacitor C2; one end of the first capacitor C1 is further connected to one end of the first inductor L1 and one end of the first resistor R1, and the other end of the first inductor L1 and the other end of the first resistor R1 are respectively connected to one end of the adjustable resistor VR1 and the pin 3 of the rectifier bridge BR1; the other end of the first capacitor C1 is also connected with the other end of the adjustable resistor VR1 and a pin 4 of the rectifier bridge BR1; a pin 1 of the rectifier bridge BR1 is connected with one end of the second capacitor C2, a pin 1 of the first control chip U1 and an output end of the adjusting part 21, and a pin 2 of the rectifier bridge BR1 and the other end of the second capacitor C2 are grounded respectively; in one embodiment, the rectifier bridge BR1 adopts a high-efficiency fast recovery rectifier bridge, so that the input loss can be effectively reduced; and the second capacitor C2 is a filtering energy storage capacitor.
In one embodiment, the rectifying and filtering unit further includes a first fuse F1, one end of the first fuse F1 is connected to an external power supply, and the other end of the first fuse F1 is connected to one end of the first capacitor C1, one end of the first inductor L1, and one end of the first resistor R1.
The utility model also correspondingly discloses a PCB board, it is as above arbitrary to print on the PCB board the control circuit of LED fluorescent tube.
The utility model also correspondingly discloses a LED fluorescent tube, include the casing and set up the lamp plate in the casing, still be provided with in the casing as above the PCB board, the PCB board with lamp plate electric connection.
It is understood that equivalent substitutions or changes can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such changes or substitutions shall fall within the scope of the present invention.
Claims (10)
1. A control circuit of an LED lamp tube is characterized by comprising a rectifying and filtering unit, a control unit and an output filtering part; the control unit comprises a first control chip U1, a boosting part and an adjusting part; the input end of the rectifying and filtering unit is used for being connected with an external power supply device, the output end of the rectifying and filtering unit is respectively connected with the pin 1 of the first control chip U1 and the output end of the adjusting part, the pin 7 of the first control chip U1 is connected with the input end of the adjusting part, the pin 5 of the first control chip U1 and the output end of the adjusting part are respectively connected with the input end of the boosting part, the output end of the boosting part is connected with the input end of the output filtering part, and the boosting part is used for outputting working current.
2. The control circuit of the LED lamp tube according to claim 1, wherein the control unit further comprises a first protection part, an output current setting part and a second protection part; the input end of the first protection part is connected with the output end of the rectification filter unit, and the output end of the first protection part is connected with a pin 1 of the first control chip U1; the output current setting part is connected with a pin 4 of the first control chip U1; the second protection part is connected with a pin 2 of the first control chip U1.
3. The control circuit of the LED lamp tube according to claim 2, wherein the first protection portion comprises a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5; one end of the second resistor R2 is connected with the output end of the rectification filtering unit, the other end of the second resistor R2 is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of the fourth resistor R4, the other end of the fourth resistor R4 and one end of the fifth resistor R5 are respectively connected with the pin 1 of the first control chip U1, and the other end of the fifth resistor R5 is grounded; the output current setting part comprises a seventh resistor R7 and an eighth resistor R8, one end of the seventh resistor R7 and one end of the eighth resistor R8 are respectively connected with the pin 4 of the first control chip U1, and the other end of the seventh resistor R7 and the other end of the eighth resistor R8 are respectively grounded; the second protection part comprises a sixth resistor R6, one end of the sixth resistor R6 is connected with the pin 2 of the first control chip U1, and the other end of the sixth resistor R6 is grounded.
4. The control circuit of the LED lamp tube according to claim 1, wherein the voltage boosting portion comprises a first diode D1, a third capacitor C3, a second diode D2 and a first transformer T1, wherein the anode of the second diode D2 and the pin 1 of the first transformer T1 are respectively connected with the pin 5 of the first control chip U1, and the pin 2 of the first transformer T1 is respectively connected with one end of the third capacitor C3 and the anode of the first diode D1; the anode of the first diode D1 is also connected with the output end of the adjusting part; the other end of the third capacitor C3 is connected to the cathode of the first diode D1, and the cathode of the first diode D1 is used for outputting current; and the cathode of the second diode D2 is connected with the output filtering part.
5. The control circuit of the LED lamp tube according to claim 4, wherein the output filter portion comprises a fourth capacitor C4, one end of the fourth capacitor C4 is connected to the cathode of the second diode D2, and the other end of the fourth capacitor C4 is grounded.
6. The control circuit of the LED lamp tube according to claim 1, wherein the adjusting portion comprises a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a third diode D3, a first voltage regulator tube ZD1 and a seventh capacitor C7; one end of the eleventh resistor R11 and one end of the ninth resistor R9 are respectively connected to the output end of the rectifying and filtering unit and the input end of the voltage boost unit; the other end of the eleventh resistor R11 is connected to one end of the twelfth resistor R12, and the other end of the ninth resistor R9 is connected to one end of the tenth resistor R10; the other end of the tenth resistor R10 is connected to the anode of the third diode D3, the cathode of the first voltage regulator tube ZD1, and one end of the seventh capacitor C7, respectively; the other end of the twelfth resistor R12 and the cathode of the third diode D3 are respectively connected with a pin 7 of the first control chip U1; the anode of the first voltage regulator tube ZD1 and the other end of the seventh capacitor C7 are grounded respectively.
7. The control circuit of the LED lamp tube according to claim 1, wherein the rectifying and filtering unit comprises a filtering portion, a rectifying portion and an energy storage portion, an input end of the filtering portion is used for connecting an external power supply device, an output end of the filtering portion is connected with an input end of the rectifying portion, and an output end of the rectifying portion is respectively connected with an input end of the energy storage portion, a pin 1 of the first control chip U1 and an output end of the regulating portion.
8. The control circuit of the LED lamp tube according to claim 7, wherein the filter portion comprises a first capacitor C1, a first inductor L1, a first resistor R1 and an adjustable resistor VR1, the first capacitor C1 is used for connecting an external power supply device; the rectifying part comprises a rectifying bridge BR1; the energy storage part comprises a second capacitor C2; one end of the first capacitor C1 is further connected to one end of the first inductor L1 and one end of the first resistor R1, and the other end of the first inductor L1 and the other end of the first resistor R1 are respectively connected to one end of the adjustable resistor VR1 and the pin 3 of the rectifier bridge BR1; the other end of the first capacitor C1 is also connected with the other end of the adjustable resistor VR1 and a pin 4 of the rectifier bridge BR1; pin 1 of rectifier bridge BR1 respectively with the one end of second electric capacity C2, pin 1 of first control chip U1 and the output of regulating part is connected, pin 2 of rectifier bridge BR1 and the other end of second electric capacity C2 ground connection respectively.
9. A PCB board, characterized in that the PCB board is printed with the control circuit of the LED lamp tube as claimed in any one of claims 1 to 8.
10. An LED lamp tube comprises a shell and a lamp panel arranged in the shell, and is characterized in that the PCB as claimed in claim 9 is further arranged in the shell, and the PCB is electrically connected with the lamp panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222249347.2U CN218456548U (en) | 2022-08-23 | 2022-08-23 | LED lamp tube, PCB and control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222249347.2U CN218456548U (en) | 2022-08-23 | 2022-08-23 | LED lamp tube, PCB and control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218456548U true CN218456548U (en) | 2023-02-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222249347.2U Active CN218456548U (en) | 2022-08-23 | 2022-08-23 | LED lamp tube, PCB and control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218456548U (en) |
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2022
- 2022-08-23 CN CN202222249347.2U patent/CN218456548U/en active Active
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