CN221103604U - Linear dimming circuit, PCB and lighting fixture - Google Patents
Linear dimming circuit, PCB and lighting fixture Download PDFInfo
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- CN221103604U CN221103604U CN202323030005.2U CN202323030005U CN221103604U CN 221103604 U CN221103604 U CN 221103604U CN 202323030005 U CN202323030005 U CN 202323030005U CN 221103604 U CN221103604 U CN 221103604U
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Abstract
The utility model discloses a linear dimming circuit, a PCB (printed circuit board) and a lighting lamp, wherein the linear dimming circuit comprises an input processing unit, a linear constant current unit and a light control unit, the linear constant current unit comprises a plurality of constant current parts, the input end of the input processing unit is used for being connected with an external power supply unit, the output end of the input processing unit is respectively connected with the power supply ends and the detection ends of the constant current parts, the input end of the light control unit is used for acquiring light control signals, the input ends of the constant current parts are respectively connected with the output ends of the light control unit and are also used for receiving dimming signals, and the output ends of the constant current parts and the output ends of the input processing unit are respectively used for being connected with an external lighting unit; according to the linear dimming circuit disclosed by the utility model, the linear dimming of the external lighting unit is realized through the matching of the constant current parts, so that the number of electrical elements can be reduced, the volume of the lighting device is reduced, and the production cost and the transportation cost of the lighting device are greatly reduced.
Description
Technical Field
The utility model relates to the technical field of driving circuits, in particular to a linear dimming circuit, a PCB (printed circuit board) and a lighting lamp.
Background
Along with the enhancement of environmental protection and energy conservation consciousness, the high-efficiency energy-saving dimming LED illumination is generated, but the existing dimmer in the market is specially designed for light source lamps such as traditional incandescent lamps, metal halogen lamps and the like, is a pure resistive load, and has good matching dimming linear effect and depth and no flicker.
However, the LED lamp is a capacitive load, the lighting dimming drive adopts a switching power supply, the switching power supply is an inductive load, and in order to realize the matching with a dimmer and meet laws and regulations such as related safety energy sources, the dimming application circuit principle is quite complex, and the main characteristics are that 1) a chopper circuit is required to be applied for realizing high power factors, or a single-stage PFC framework or a valley filling circuit is adopted; 2) Complex bleeder circuits and the like must be designed to achieve dimming linearity and matching; 3) Electrolytic capacitors must be used; 4) The energy storage displacement must be accomplished using magnetic elements or the like; 5) Necessary components and the like of circuits such as EMC, EMI, ESD are added to meet the requirements of related authentication; the existing dimming application circuit has the problems of complex circuit structure and high circuit cost, and the whole volume of the lamp is larger due to the fact that the circuit comprises more electrical elements, so that the transportation cost is indirectly increased.
It can be seen that there is a need for improvements and improvements in the art.
Disclosure of utility model
In view of the above-mentioned shortcomings of the prior art, the present utility model aims to provide a linear dimming circuit, which can realize dimming through fewer electrical components, can reduce the size of a lighting fixture, and has the advantages of low manufacturing cost and low transportation cost.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
The linear dimming circuit comprises an input processing unit, a linear constant current unit and a light control unit, wherein the linear constant current unit comprises a plurality of constant current parts, the input end of the input processing unit is used for being connected with an external power supply unit, the output end of the input processing unit is respectively connected with the power supply ends and the detection ends of the constant current parts, the input end of the light control unit is used for obtaining light control signals, the output end of the light control unit is respectively connected with the input ends of the constant current parts, the input ends of the constant current parts are also used for receiving dimming signals, and the output ends of the constant current parts and the output ends of the input processing unit are respectively used for being connected with an external lighting unit.
The linear dimming circuit further comprises a color temperature adjusting unit, wherein the output end of the color temperature adjusting unit is used for being connected with an external lighting unit, and the color temperature adjusting unit is used for adjusting output current output to the external lighting unit according to the dialing information.
In the linear dimming circuit, the input processing unit comprises a surge protection part and a rectifying part, wherein the input end of the surge protection part is used for being connected with an external power supply unit, the output end of the surge protection part is connected with the input end of the rectifying part, and the output end of the rectifying part is respectively connected with the power supply ends and the detection ends of the constant current parts and is used for being connected with an external lighting unit.
The linear dimming circuit comprises a first constant current part, a second constant current part and a third constant current part, wherein the circuit structures of the second constant current part and the third constant current part are the same; the output end of the light control unit is respectively connected with the input end of the first constant current part, the input end of the second constant current part and the input end of the third constant current part, the input end of the first constant current part, the input end of the second constant current part and the input end of the third constant current part are respectively used for receiving dimming signals, and the output end of the first constant current part, the output end of the second constant current part and the output end of the third constant current part are respectively used for connecting an external lighting unit.
In the linear dimming circuit, the first constant current part comprises a first control chip U1 and a detection group, a pin 4 of the first control chip U1 is connected with one end of the detection group, and the other end of the detection group is connected with the output end of the input processing unit; the pin 2 of the first control chip U1 is connected with the output end of the light control unit and is used for receiving a dimming signal, the pin 8 of the first control chip U1 is connected with the output end of the input processing unit, the pin 6 of the first control chip U1 is used for being connected with an external lighting unit, and the pin 1 of the first control chip U1 is used for being connected with the power supply end of the light control unit.
In the linear dimming circuit, the first constant current part further comprises a sampling group, the input end of the sampling group is connected with the output end of the input processing unit, and the output end of the sampling group is connected with the pin 3 of the first control chip U1.
In the linear dimming circuit, the first constant current part further comprises a protection group, one end of the protection group is respectively connected with the pin 6 and the pin 9 of the first control chip U1, and the other end of the protection group is used for being connected with an external lighting unit.
In the linear dimming circuit, the light control unit comprises a fourth control chip U4, a signal acquisition part and a conduction control part, wherein the signal acquisition part is used for acquiring light control signals, the signal acquisition part is respectively connected with a pin 2 and a pin 8 of the fourth control chip U4, the input end of the conduction control part is connected with a pin 3 of the fourth control chip U4, and the output end of the conduction control part is respectively connected with the input ends of the constant current parts.
The utility model also correspondingly provides a PCB board on which the linear dimming circuit is printed.
The utility model also correspondingly provides a lighting lamp, and the lighting lamp adopts the linear dimming circuit to realize work control.
The beneficial effects are that:
The utility model provides a linear dimming circuit, which realizes the linear dimming of an external lighting unit through the matching of a plurality of constant current parts, can reduce the number of electrical elements, reduces the volume of a lighting device, and greatly reduces the production cost and the transportation cost of the lighting device; further, the light control unit receives the light control signal to adjust the working state of the constant current part, so that the linear dimming circuit can automatically start working according to the brightness of the external environment, the flexibility of the linear dimming circuit in working is improved, and the use experience of a user is improved.
Drawings
Fig. 1 is a circuit block diagram of a linear dimming circuit provided by the present utility model;
FIG. 2 is a circuit configuration diagram of an input processing unit, a linear constant current unit and a light control unit provided by the utility model;
fig. 3 is a circuit configuration diagram of a color temperature adjusting unit provided by the present utility model.
Description of main reference numerals: the device comprises a 1-input processing unit, a 11-surge protection part, a 12-rectifying part, a 2-linear constant current unit, a 21-first constant current part, a 211-detection group, a 212-sampling group, a 213-protection group, a 22-second constant current part, a 23-third constant current part, a 3-light control unit, a 31-signal acquisition part, a 32-conduction control part and a 4-color temperature adjusting unit.
Detailed Description
The utility model provides a linear dimming circuit, a PCB (printed circuit board) and a lighting lamp, which are used for making the purposes, the technical scheme and the effects of the utility model clearer and more definite, and the utility model is further described in detail below by referring to the accompanying drawings and the embodiments.
In the description of the present utility model, it should be understood that, furthermore, the terms "mounted," "connected," and the like should be construed broadly, and that the specific meaning of the terms in the present utility model will be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 to 3, the present utility model provides a linear dimming circuit, which includes an input processing unit 1, a linear constant current unit 2 and a light control unit 3, wherein the linear constant current unit 2 includes a plurality of constant current units, an input end of the input processing unit 1 is used for being connected with an external power supply unit, an output end of the input processing unit 1 is respectively connected with power supply ends and detection ends of the constant current units, an input end of the light control unit 3 is used for obtaining a light control signal, an output end of the light control unit 3 is respectively connected with input ends of the constant current units, input ends of the constant current units are also used for receiving a dimming signal, and an output end of the constant current unit and an output end of the input processing unit 1 are respectively used for being connected with an external lighting unit.
The application discloses a linear dimming circuit, which realizes linear dimming of an external lighting unit through matching of a plurality of constant current parts, can reduce the number of electrical elements, reduces the whole volume of a lighting device, and greatly reduces the production cost and the transportation cost of the lighting device; further, the light control unit 3 receives the light control signal to adjust the working state of the constant current part, so that the linear dimming circuit can automatically start working according to the brightness of the external environment, the flexibility of the linear dimming circuit in working is improved, and the use experience of a user is improved.
Further, referring to fig. 1 and 3, the linear dimming circuit further includes a color temperature adjusting unit 4, an output end of the color temperature adjusting unit 4 is used for being connected with an external lighting unit, and the color temperature adjusting unit 4 is used for adjusting an output current output to the external lighting unit according to the dialing information.
In this embodiment, by setting the color temperature adjusting unit 4, the color temperature of the external lighting unit can be adjusted, that is, the color temperature of the lighting device can be adjusted, so that the flexibility of the lighting device during working is improved, and the use experience of a user is further improved.
In this embodiment, referring to fig. 2, the color temperature adjusting unit 4 includes a dial switch SW1, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, a fourth resistor R10, a nineteenth resistor R19, and a twentieth resistor R20, the pin 1 of the dial switch SW1 is connected to one end of the fifteenth resistor R15 and one end of the sixteenth resistor R16, respectively, and is used for connecting an external lighting unit, the pin 3 of the dial switch SW1 is connected to the other end of the fifteenth resistor R15 and the other end of the sixteenth resistor R16, the pin 5 of the dial switch SW1 is connected to one end of the seventeenth resistor R17 and one end of the eighteenth resistor R18, respectively, the pin 2 of the dial switch SW1 is connected to one end of the nineteenth resistor R19 and one end of the twentieth resistor R20, the other end of the nineteenth resistor R19, the other end of the seventeenth resistor R20, the other end of the seventeenth resistor R17, the eighteenth resistor R18, and the pin 6 of the eighteenth resistor R18 are connected to the pin 6, and the pin 8, respectively, and the pin 6 and the external lighting unit are connected to the pin 12; the external lighting unit comprises a plurality of lamp beads, the lamp beads comprise 27K and 50K color temperatures, and the switching states of the dial switch SW1 are adjusted to provide currents with different proportions for the external lighting unit, so that the adjustment of the color temperatures of 27K, 30K, 35K, 40K and 50K is realized, and the work flexibility of the linear dimming circuit is greatly improved.
Further, referring to fig. 1 and 2, the input processing unit 1 includes a surge protection portion 11 and a rectifying portion 12, an input end of the surge protection portion 11 is used for being connected to an external power supply unit, an output end of the surge protection portion 11 is connected to an input end of the rectifying portion 12, and output ends of the rectifying portion 12 are respectively connected to power supply ends and detection ends of the constant current portions and are used for being connected to an external lighting unit.
In the present embodiment, the surge protection portion 11 includes a first circuit breaker FR1, a second circuit breaker FR2, and a first potentiometer VR1, the rectifying portion 12 includes a rectifier bridge DB1, and the input processing unit 1 further includes a second potentiometer VR3; one end of the first circuit breaker FR1 and one end of the second circuit breaker FR2 are respectively used for being connected with an external power supply unit, the external power supply unit provides 120V input voltage, the other end of the first circuit breaker FR1 and one end of the first potentiometer VR1 are respectively connected with the pin 1 of the rectifier bridge DB1, the other end of the second circuit breaker FR1 and the other end of the first potentiometer VR1 are respectively connected with the pin 2 of the rectifier bridge DB1, the pin 3 of the rectifier bridge DB1 is respectively connected with one end of the second potentiometer VR2 and power supply ends of the constant current parts, and the pin 4 of the rectifier bridge DB1 and the other end of the second potentiometer VR2 are respectively grounded; the rectifier bridge DB1 adopts a high-efficiency fast recovery rectifier bridge, so that the input loss can be effectively reduced.
Further, referring to fig. 1 and 2, the linear dimming circuit includes a first constant current portion 21, a second constant current portion 22, and a third constant current portion 23, and the circuit structures of the second constant current portion 22 and the third constant current portion 23 are the same; the output end of the input processing unit 1 is respectively connected with the power supply end and the detection end of the first constant current portion 21, the power supply end and the detection end of the second constant current portion 22 and the power supply end and the detection end of the third constant current portion 23, the output end of the light control unit 3 is respectively connected with the input end of the first constant current portion 21, the input end of the second constant current portion 22 and the input end of the third constant current portion 23, the input end of the first constant current portion 21, the input end of the second constant current portion 22 and the input end of the third constant current portion 23 are respectively used for receiving dimming signals, and the output end of the first constant current portion 21, the output end of the second constant current portion 22 and the output end of the third constant current portion 23 are respectively used for connecting an external lighting unit.
In the embodiment, linear dimming of the external lighting unit is realized through matching of three constant current parts; the structure of the second constant current part 22 and the structure of the third constant current part 23 are similar to the interfaces of the first constant current part 21, the second constant current part 22 comprises a second control chip U2 and a second detection part connected with the pin 4 of the second control chip U2, the third constant current part 23 comprises a third control chip U3 and a third detection part connected with the pin 4 of the third control chip U3, and the models of the second control chip U2 and the third control chip U3 are MT7653.
Further, referring to fig. 1 and 2, the first constant current portion 21 includes a first control chip U1 and a detection group 211, a pin 4 of the first control chip U1 is connected to one end of the detection group 211, and the other end of the detection group 211 is connected to an output end of the input processing unit 1; the pin 2 of the first control chip U1 is connected with the output end of the light control unit 3 and is used for receiving a dimming signal, the pin 8 of the first control chip U1 is connected with the output end of the input processing unit 1, the pin 6 of the first control chip U1 is used for being connected with an external lighting unit, and the pin 1 of the first control chip U1 is used for being connected with the power supply end of the light control unit 3.
In this embodiment, the model of the first control chip U1 is MT7653, the first control chip U1 is a linear PWM control constant current LED driving chip with 5V power supply, the output current is adjustable, the constant current precision is high, the 5V power supply supports 5mA driving current at the highest, and specifically, the 5mA driving current is provided through the pin 1; further, the first control chip U1 has an over-temperature adjusting function, when the chip temperature is too high, the output current can be automatically reduced, so that the reliability and the safety of the linear dimming circuit during working are guaranteed, the EMC problem is avoided, the peripheral circuit is simple, the driving circuit is small in size, and the cost is low.
In this embodiment, the detection set 211 includes a fourth resistor R4 and a fifth resistor R5, one end of the fourth resistor R4 and one end of the fifth resistor R5 are respectively connected to the pin 4 of the first control chip U1, and the other end of the fourth resistor R4 and the other end of the fifth resistor R5 are respectively connected to the other end of the second potentiometer VR2 and the pin 4 of the rectifier bridge DB 1; in actual operation, when the external power supply unit supplies power normally, the pin 8 of the first control chip U1 supplies power to the first control chip U1 through the internal high voltage JEFT, specifically, when Vin of the pin 8 is greater than 8V, the first control chip U1 starts to work, the detection group 211 feeds back the detection electric signal to the pin 4 of the first control chip U1, the pin 4 is a detection CS pin, and the constant current effect can be achieved by detecting the voltage of the pin 4 and comparing with the internal reference voltage.
Further, referring to fig. 1 and 2, the first constant current portion 21 further includes a sampling group 212, an input end of the sampling group 212 is connected to an output end of the input processing unit 1, and an output end of the sampling group 212 is connected to the pin 3 of the first control chip U1.
In this embodiment, referring to fig. 2, the sampling portion includes a first resistor R1, a second resistor R2, a third resistor R3, and a first capacitor C1, where one end of the first resistor R1 is connected to a pin 3 of the rectifier bridge DB1, and the other end of the first resistor R1 is respectively connected to one end of the third resistor R3, one end of the first capacitor C1, and a pin 3 of the first control chip U1 through the second resistor R2, and the other end of the first capacitor C1 and the other end of the third resistor R3 are respectively grounded; the first resistor R1, the second resistor R2 and the third resistor R3 are sampling resistors, the first control chip U1 samples input voltage through the pin 3, namely the pin LN, and adjusts the reference voltage VREF_CS by adjusting the external resistor of the LN pin, so that the input power is basically stable.
Further, referring to fig. 1 and 2, the first constant current portion 21 further includes a protection group 213, one end of the protection group 213 is connected to the pin 6 and the pin 9 of the first control chip U1, respectively, and the other end of the protection group 213 is used for connecting an external lighting unit.
In this embodiment, referring to fig. 2, the protection set 213 includes a third capacitor C3 and a third potentiometer VR3, one end of the third capacitor C3 and one end of the third potentiometer VR3 are respectively connected with the pin 9 of the first control chip U1, the other end of the third capacitor C3 and the other end of the third potentiometer VR3 are respectively connected with the pin 6 of the first control chip U1, the pin 6 of the second control chip U2 and the pin 6 of the third control chip U3, and the protection set 213 is used for realizing surge protection and improving the safety and stability of the linear dimming circuit during operation.
Further, referring to fig. 1 and 2, the light control unit 3 includes a fourth control chip U4, a signal collecting portion 31 and a conducting control portion 32, the signal collecting portion 31 is configured to collect light control signals, the signal collecting portion 31 is respectively connected with a pin 2 and a pin 8 of the fourth control chip U4, an input end of the conducting control portion 32 is connected with a pin 3 of the fourth control chip U4, and output ends of the conducting control portion 32 are respectively connected with input ends of the constant current portions.
In this embodiment, the model of the fourth control chip U4 is NE555; the signal acquisition part 31 includes a photodiode VD1 and an eighth capacitor C8, and the conduction control part 32 includes an eleventh resistor R11, a twelfth resistor R12, and a first triode Q1; one end of the photodiode VD1 and one end of the eighth capacitor C8 are respectively connected with the pin 1 of the fourth control chip U4 and the pin 1 of the first control chip U1, the other end of the photodiode VD1 and the other end of the eighth capacitor C8 are respectively connected with the pin 2 of the fourth control chip U4, the pin 3 of the fourth control chip U4 is connected with one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is respectively connected with one end of the twelfth resistor R12 and the base of the first triode Q1, and the collector of the first triode Q1 is respectively connected with the pin 2 of the first control chip U1, the pin 2 of the second control chip U2 and the pin 2 of the third control chip U3; the other end of the twelfth resistor R12 and the emitter of the first triode Q1 are respectively grounded.
When the external environment is daytime, the brightness is higher, the photo diode VD1 collects a brighter light signal and feeds the brighter light signal back to the pin 2 of the fourth control chip U4, the pin 3 of the fourth control chip U4 outputs a high level to drive the first triode Q1 so as to pull down the PWM pin voltage of the three constant current parts, the control chips of the three constant current parts close the output, and the external lighting unit stops working; when the external environment is at night, the photodiode VD1 collects dark light signals and feeds the dark light signals back to the pin 2 of the fourth control chip U4, the pin 3 of the fourth control chip U4 outputs low level, the first triode Q1 is in a closed state, the PWM pins of the three constant current parts are in high level, the control chips of the three constant current parts output normally, and the external lighting unit starts to work, so that the light control function is realized.
The utility model also correspondingly provides a PCB board on which the linear dimming circuit is printed.
The utility model also correspondingly provides a lighting lamp, and the lighting lamp adopts the linear dimming circuit to realize work control.
It will be understood that equivalents and modifications will occur to those skilled in the art based on the present utility model and its spirit, and all such modifications and substitutions are intended to be included within the scope of the present utility model.
Claims (10)
1. The linear dimming circuit is characterized by comprising an input processing unit, a linear constant current unit and a light control unit, wherein the linear constant current unit comprises a plurality of constant current parts, the input end of the input processing unit is used for being connected with an external power supply unit, the output end of the input processing unit is respectively connected with the power supply ends and the detection ends of the constant current parts, the input end of the light control unit is used for obtaining light control signals, the output end of the light control unit is respectively connected with the input ends of the constant current parts, the input ends of the constant current parts are also used for receiving dimming signals, and the output ends of the constant current parts and the output ends of the input processing unit are respectively used for being connected with an external lighting unit.
2. The linear dimming circuit of claim 1, further comprising a color temperature adjustment unit, wherein an output end of the color temperature adjustment unit is connected to the external lighting unit, and the color temperature adjustment unit is configured to adjust an output current to the external lighting unit according to the dial information.
3. The linear dimming circuit according to claim 1, wherein the input processing unit comprises a surge protection portion and a rectifying portion, an input end of the surge protection portion is used for being connected with an external power supply unit, an output end of the surge protection portion is connected with an input end of the rectifying portion, and output ends of the rectifying portion are respectively connected with power supply ends and detection ends of the constant current portions and are used for being connected with an external lighting unit.
4. The linear dimming circuit as claimed in claim 1, comprising a first constant current portion, a second constant current portion and a third constant current portion, wherein the circuit structures of the second constant current portion and the third constant current portion are identical; the output end of the light control unit is respectively connected with the input end of the first constant current part, the input end of the second constant current part and the input end of the third constant current part, the input end of the first constant current part, the input end of the second constant current part and the input end of the third constant current part are respectively used for receiving dimming signals, and the output end of the first constant current part, the output end of the second constant current part and the output end of the third constant current part are respectively used for connecting an external lighting unit.
5. The linear dimming circuit as claimed in claim 4, wherein the first constant current part comprises a first control chip U1 and a detection group, a pin 4 of the first control chip U1 is connected with one end of the detection group, and the other end of the detection group is connected with an output end of the input processing unit; the pin 2 of the first control chip U1 is connected with the output end of the light control unit and is used for receiving a dimming signal, the pin 8 of the first control chip U1 is connected with the output end of the input processing unit, the pin 6 of the first control chip U1 is used for being connected with an external lighting unit, and the pin 1 of the first control chip U1 is used for being connected with the power supply end of the light control unit.
6. The linear dimming circuit of claim 5, wherein the first constant current section further comprises a sampling group, an input terminal of the sampling group is connected to an output terminal of the input processing unit, and an output terminal of the sampling group is connected to pin 3 of the first control chip U1.
7. The linear dimming circuit as claimed in claim 5, wherein the first constant current part further comprises a protection group, one end of the protection group is connected to the pin 6 and the pin 9 of the first control chip U1, respectively, and the other end of the protection group is used for connecting an external lighting unit.
8. The linear dimming circuit according to claim 1, wherein the light control unit comprises a fourth control chip U4, a signal collecting portion and a conduction control portion, the signal collecting portion is used for collecting light control signals, the signal collecting portion is respectively connected with a pin 2 and a pin 8 of the fourth control chip U4, an input end of the conduction control portion is connected with a pin 3 of the fourth control chip U4, and an output end of the conduction control portion is respectively connected with input ends of the constant current portions.
9. A PCB board on which the linear dimming circuit according to any one of claims 1 to 8 is printed.
10. A lighting fixture, characterized in that it employs a linear dimming circuit as claimed in any one of claims 1-8 for operational control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323030005.2U CN221103604U (en) | 2023-11-09 | 2023-11-09 | Linear dimming circuit, PCB and lighting fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323030005.2U CN221103604U (en) | 2023-11-09 | 2023-11-09 | Linear dimming circuit, PCB and lighting fixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221103604U true CN221103604U (en) | 2024-06-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323030005.2U Active CN221103604U (en) | 2023-11-09 | 2023-11-09 | Linear dimming circuit, PCB and lighting fixture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221103604U (en) |
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2023
- 2023-11-09 CN CN202323030005.2U patent/CN221103604U/en active Active
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