CN219577309U - LED lamp and control circuit thereof - Google Patents
LED lamp and control circuit thereof Download PDFInfo
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- CN219577309U CN219577309U CN202320067131.6U CN202320067131U CN219577309U CN 219577309 U CN219577309 U CN 219577309U CN 202320067131 U CN202320067131 U CN 202320067131U CN 219577309 U CN219577309 U CN 219577309U
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Abstract
The utility model discloses an LED lamp and a control circuit thereof, wherein the LED lamp comprises a rectifying circuit, an LED driving circuit, a microwave induction circuit and a voltage-stabilizing power supply circuit, wherein the input end of the rectifying circuit is used for being connected with external input voltage, the output end of the rectifying circuit is respectively connected with the input end of the voltage-stabilizing power supply circuit and the input end of the LED driving circuit, the output end of the voltage-stabilizing power supply circuit is connected with the microwave induction circuit, and the output end of the LED driving circuit is used for being connected with an external LED lamp; the LED driving circuit comprises a first control chip U1, an anti-interference unit and a voltage reduction unit, wherein one end of the anti-interference unit and the output end of the microwave induction circuit are respectively connected with a pin CTRL of the first control chip U1, and the other end of the voltage reduction unit is connected with the LED driving circuit; the control circuit of the LED lamp provided by the utility model comprises the anti-interference unit and the voltage reduction unit, so that the induction stability of the control circuit and the conversion efficiency of the circuit can be improved, and the problem of flashing of the LED lamp is avoided.
Description
Technical Field
The utility model relates to the technical field of power supply control, in particular to an LED lamp and a control circuit thereof.
Background
The microwave radar induction lamp is a novel intelligent illumination product which automatically controls the light source to be lightened through the radar induction module, and when a person enters the detection range of the microwave radar induction lamp, the microwave detector works to lighten the LED lamp; compared with an infrared induction lamp, the microwave radar induction lamp has the advantages that the induction distance is longer, the detection range is wider, glass and thin wood plates can be penetrated, walls with different thicknesses can be penetrated according to different powers, and the influence from the environment is small; therefore, the microwave induction radar lamp has better application prospect in the current market.
In the existing control circuit of the LED lamp, the microwave module is directly connected with the pins of the linear constant current driving chip, and the pins of the linear constant current driving chip connected with the microwave module are easy to malfunction and cause flashing light due to too long wiring, external interference and the like.
It can be seen that there is a need for improvements and enhancements in the art
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present utility model is to provide an LED lamp and a control circuit thereof, wherein the control circuit includes an anti-interference unit, so as to improve the sensing stability and reduce the probability of malfunction of the pin CTRL.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the control circuit of the LED lamp comprises a rectifying circuit, an LED driving circuit, a microwave induction circuit and a voltage-stabilizing power supply circuit, wherein the input end of the rectifying circuit is used for being connected with external input voltage, the output end of the rectifying circuit is respectively connected with the input end of the voltage-stabilizing power supply circuit and the input end of the LED driving circuit, the output end of the voltage-stabilizing power supply circuit is connected with the microwave induction circuit, and the output end of the LED driving circuit is used for being connected with an external LED lamp; the LED driving circuit comprises a first control chip U1, an anti-interference unit and a voltage reduction unit, wherein one end of the anti-interference unit and the output end of the microwave induction circuit are respectively connected with a pin CTRL of the first control chip U1, the other end of the anti-interference unit is grounded, one end of the voltage reduction unit is used for being connected with an external LED lamp, and the other end of the voltage reduction unit is connected with the LED driving circuit.
In the control circuit of the LED lamp, the anti-interference unit includes a sixth resistor R6 and a fifth capacitor C5 connected in parallel, one end of the sixth resistor R6 is connected to a pin CTRL of the first control chip U1, and the other end of the sixth resistor R6 is grounded; one end of the fifth capacitor C5 is connected to the pin CTRL of the first control chip U1, and the other end of the fifth capacitor C5 is grounded.
In the control circuit of the LED lamp, the voltage reduction unit comprises a first diode D1, a second resistor R2, a third capacitor C3, a fourth capacitor C4 and a second inductor L2, one ends of the anode of the first diode D1 and the second inductor L2 are respectively connected with a pin D1 and a pin D2 of a first control chip U1, the other end of the second inductor L2 is respectively connected with one end of the second resistor R2, one end of the third capacitor C3 and a cathode of the LED lamp, the cathode of the first diode D1, the other end of the second resistor R2 and the other end of the third capacitor C3 are respectively connected with an anode of the LED lamp, one end of the fourth capacitor C4 is connected with the cathode of the LED, and the other end of the fourth capacitor C4 is grounded.
In the control circuit of the LED lamp, the LED driving circuit further comprises a third resistor R3, a fourth resistor R4 and a fifth resistor R5, one ends of the third resistor R3 and the fourth resistor R4 are respectively connected with a pin CS of the first control chip U1, the other ends of the third resistor R3 and the fourth resistor R4 are grounded, one end of the fifth resistor R5 is connected with a pin ROVP of the first control chip U1, the other end of the fifth resistor R5 is grounded, a pin HV of the first control chip U1 is connected with a rectifying circuit, and a pin CTRL of the first control chip U1 is connected with a microwave induction circuit.
In the control circuit of the LED lamp, the rectifier circuit comprises a fuse F1, an exciting coil LF1, a rectifier BD1, a first resistor R1, a first inductor L1, a first capacitor C1 and a second capacitor C2, one end of the fuse F1 is connected with a live wire, the other end of the fuse F1 is connected with the input end of the exciting coil LF1, the output end of the exciting coil LF1 is respectively connected with a pin 1 and a pin 2 of the rectifier BD1, a pin 3 of the rectifier BD1 is grounded, one end of the first resistor R1 is respectively connected with a pin 4 of the rectifier BD1, one end of the first inductor L1 and one end of the first capacitor C1, and a common connection point of one end of the first resistor R1, the other end of the first capacitor L1 and one end of the second capacitor C2 is used as an output end of the rectifier circuit, and the other end of the first capacitor C1 and the other end of the second capacitor C2 are respectively grounded.
In the control circuit of the LED lamp, the voltage stabilizing power supply circuit includes a second control chip U2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a third inductor L3, a sixth capacitor C6, a seventh capacitor C7, and a second diode D2; the pin D of the second control chip U2 is connected with a rectifying circuit, one end of a seventh resistor R7 is connected with the pin FB of the second control chip U2, the other end of the seventh resistor R7 is connected with one end of a seventh capacitor C7, the other end of the seventh capacitor C7 is grounded, one end of an eighth resistor R8 is connected with the pin FB of the second control chip U2, the other end of the eighth resistor R8 and one end of a third inductor L3 are respectively connected with the pin GND of the second control chip U2, the other end of the third inductor L3 is respectively connected with a microwave induction circuit and one end of a ninth resistor R9, the other end of the ninth resistor R9 is grounded, one end of a sixth capacitor C6 is connected with the pin VCC of the second control chip U2, the cathode of the second diode D2 is respectively connected with the other end of the sixth capacitor C6 and the pin GND of the second control chip U2, and the anode of the second diode D2 is grounded.
In the control circuit of the LED lamp, the microwave induction circuit comprises a microwave radar inductor P1, a pin VCC of the microwave radar inductor P1 is connected with a voltage-stabilizing power supply circuit, a pin OUT of the microwave radar inductor P1 is connected with a pin CTRL of a first control chip U1, and a pin GND of the microwave radar inductor P1 is grounded.
The utility model also correspondingly provides an LED lamp which comprises a printed circuit board, wherein the printed circuit board is printed with the control circuit of the LED lamp.
The beneficial effects are that:
the utility model provides an LED lamp and a control circuit thereof, which have the following advantages:
(1) The LED driving circuit comprises an anti-interference unit, can absorb circuit interference caused by overlong wiring, avoids misoperation of a pin CTRL of the first control chip U1, and improves the induction stability;
(2) The LED driving circuit comprises a voltage reduction unit, when the power grid voltage is very high, the voltage reduction unit can reduce the power burden of the first control chip U1, improve the conversion efficiency of the first control chip U1 and reduce the heating value of the first control chip U1.
Drawings
FIG. 1 is a circuit block diagram of a control circuit of an LED lamp provided by the utility model;
fig. 2 is a circuit configuration diagram of a control circuit of an LED lamp according to the present utility model.
Description of main reference numerals: 1-step-down unit, 2-anti-interference unit.
Detailed Description
The utility model provides an LED lamp and a control circuit thereof, which are used for making the purposes, technical schemes and 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 examples. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the utility model.
In the description of the present utility model, it is to be understood that the terms "mounted," "connected," and the like are to be construed broadly as well, unless explicitly specified and defined otherwise, and that the specific meaning of the above terms in the present utility model will be understood by those of ordinary skill in the art in light of the specific circumstances.
Referring to fig. 1, the utility model provides a control circuit of an LED lamp, which comprises a rectifying circuit, an LED driving circuit, a microwave induction circuit and a voltage stabilizing power supply circuit, wherein the input end of the rectifying circuit is used for connecting an external input voltage, the output end of the rectifying circuit is respectively connected with the input end of the voltage stabilizing power supply circuit and the input end of the LED driving circuit, the output end of the voltage stabilizing power supply circuit is connected with the microwave induction circuit, and the output end of the LED driving circuit is used for connecting an external LED lamp; the LED driving circuit comprises a first control chip U1, an anti-interference unit 2 and a voltage reduction unit 1, wherein one end of the anti-interference unit 2 and the output end of the microwave induction circuit are respectively connected with a pin CTRL of the first control chip U1, the other end of the anti-interference unit 2 is grounded, one end of the voltage reduction unit 1 is connected with an external LED lamp, and the other end of the voltage reduction unit 1 is connected with the LED driving circuit; in this embodiment, the model number of the first control chip U1 is YJH X20.
The rectification circuit provides direct current power for the LED driving circuit and the voltage-stabilizing power supply circuit, the voltage-stabilizing power supply circuit provides stable working voltage for the microwave induction circuit, the microwave induction circuit sends induction signals to the LED driving circuit according to detected information, a pin CTRL of the first control chip U1 is connected with the microwave induction circuit, and the first control chip U1 sends out control signals to control the external LED lamp to be turned on or turned off; when the connecting wire between the microwave induction circuit and the LED driving circuit is overlong, the circuit is easily affected by external interference, so that the pin CTRL of the first control chip U1 is easily subjected to misoperation, and the flashing phenomenon of the LED lamp group is caused; and be provided with step-down unit 1, when the electric wire netting voltage is very high, step-down unit 1 can alleviate the power burden of first control chip U1, improves first control chip U1's conversion efficiency, reduces calorific capacity.
Further, the anti-interference unit 2 includes a sixth resistor R6 and a fifth capacitor C5 connected in parallel, where one end of the sixth resistor R6 is connected to the pin CTRL of the first control chip U1, and the other end of the sixth resistor R6 is grounded; one end of the fifth capacitor C5 is connected with the pin CTRL of the first control chip U1, and the other end of the fifth capacitor C5 is grounded; when the frequency of an input signal is smaller than the turning frequency f0 (f0=1/2pi R4C 3), the input signal is direct current relative to the circuit, the total impedance of the circuit is equal to R6, when the frequency of the input signal is larger than f0, the capacitance of C5 is relatively small, the total impedance is equal to the resistance value of the resistor and the capacitance resistance of the upper capacitor (the calculation mode of the total impedance is the calculation mode of the impedance when the capacitor is connected with the resistor in parallel in the prior art), when the frequency of the input signal is high to a certain extent, the total impedance of the anti-interference unit 2 is zero, namely when the circuit has instant high resistance due to external interference, the total impedance of the anti-interference unit 2 is zero, and as one end of the anti-interference unit 2 is grounded, the anti-interference unit can absorb interference, the pin CTRL of the first control chip U1 is prevented from generating misoperation, the induction stability of the LED driving circuit is improved, and the circuit is simple in structure and low in cost.
Further, the voltage reduction unit 1 includes a first diode D1, a second resistor R2, a third capacitor C3, a fourth capacitor C4, and a second inductor L2, where one ends of the anode of the first diode D1 and the second inductor L2 are connected to the pin D1 and the pin D2 of the first control chip U1, the other end of the second inductor L2 is connected to one end of the second resistor R2, one end of the third capacitor C3, and the cathode of the LED lamp, the cathode of the first diode D1, the other end of the second resistor R2, and the other end of the third capacitor C3 are connected to the anode of the LED lamp, one end of the fourth capacitor C4 is connected to the cathode of the LED, and the other end of the fourth capacitor C4 is grounded; in this embodiment, the third capacitor C3 is a filter capacitor; compared with the linear constant current in the prior art, the control circuit provided by the utility model adopts a non-isolation scheme, and when the power grid voltage is large, the voltage reduction unit 1 can lighten the power burden of the first control chip U1, improve the conversion efficiency of the first control chip U1 and reduce the heating value of the first control chip U1.
Further, the LED driving circuit further includes a third resistor R3, a fourth resistor R4, and a fifth resistor R5, one ends of the third resistor R3 and the fourth resistor R4 are respectively connected with the pin CS of the first control chip U1, the other ends of the third resistor R3 and the fourth resistor R4 are grounded, one end of the fifth resistor R5 is connected with the pin ROVP of the first control chip U1, the other end of the fifth resistor R5 is grounded, the pin HV of the first control chip U1 is connected with the output end of the rectifying circuit, and the pin CTRL of the first control chip U1 is connected with the microwave sensing circuit.
Further, the rectifying circuit includes a fuse F1, an exciting coil LF1, a rectifier BD1, a first resistor R1, a first inductor L1, a first capacitor C1 and a second capacitor C2, where one end of the fuse F1 is connected with a live wire, the other end of the fuse F1 is connected with an input end of the exciting coil LF1, an output end of the exciting coil LF1 is connected with a pin 1 and a pin 2 of the rectifier BD1, a pin 3 of the rectifier BD1 is grounded, one end of the first resistor R1 is connected with a pin 4 of the rectifier BD1, one end of the first inductor L1 and one end of the first capacitor C1, a common connection point of the other end of the first resistor R1, the other end of the first capacitor L1 and one end of the second capacitor C2 is used as an output end of the rectifying circuit, and the other end of the first capacitor C1 and the other end of the second capacitor C2 are grounded; the exciting coil LF1 enables the control circuit to pass EMC authentication; in this embodiment, the first capacitor C1 and the second capacitor C2 are both filter capacitors.
Further, the regulated power supply circuit comprises a second control chip U2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a third inductor L3, a sixth capacitor C6, a seventh capacitor C7 and a second diode D2; the pin D of the second control chip U2 is connected with a rectifying circuit, one end of a seventh resistor R7 is connected with the pin FB of the second control chip U2, the other end of the seventh resistor R7 is connected with one end of a seventh capacitor C7, the other end of the seventh capacitor C7 is grounded, one end of an eighth resistor R8 is connected with the pin FB of the second control chip U2, the other end of the eighth resistor R8 and one end of a third inductor L3 are respectively connected with the pin GND of the second control chip U2, the other end of the third inductor L3 is respectively connected with the pin VCC of a microwave radar sensor of a microwave sensing circuit and one end of a ninth resistor R9, the other end of the ninth resistor R9 is grounded, one end of a sixth capacitor C6 is connected with the pin VCC of the second control chip U2, the cathode of the second diode D2 is respectively connected with the other end of the sixth capacitor C6 and the pin GND of the second control chip U2, and the anode of the second diode D2 is grounded; in this embodiment, the model number of the second control chip U2 is YJH101, and the seventh capacitor C7 is a filter capacitor.
Further, the microwave induction circuit comprises a microwave radar inductor P1, a pin VCC of the microwave radar inductor P1 is connected with a pin CND of a second control chip U2 of the voltage stabilizing power supply circuit, a pin OUT of the microwave radar inductor P1 is connected with a pin CTRL of the first control chip U1, and a pin GND of the microwave radar inductor P1 is grounded; in this embodiment, the microwave radar sensor P1 is a microwave radar sensor in the prior art.
The utility model also correspondingly provides an LED lamp which comprises a printed circuit board, wherein the printed circuit board is printed with the control circuit of the LED lamp.
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 (8)
1. The control circuit of the LED lamp is characterized by comprising a rectifying circuit, an LED driving circuit, a microwave induction circuit and a voltage-stabilizing power supply circuit, wherein the input end of the rectifying circuit is used for being connected with external input voltage, the output end of the rectifying circuit is respectively connected with the input end of the voltage-stabilizing power supply circuit and the input end of the LED driving circuit, the output end of the voltage-stabilizing power supply circuit is connected with the microwave induction circuit, and the output end of the LED driving circuit is used for being connected with an external LED lamp; the LED driving circuit comprises a first control chip U1, an anti-interference unit and a voltage reduction unit, wherein one end of the anti-interference unit and the output end of the microwave induction circuit are respectively connected with a pin CTRL of the first control chip U1, the other end of the anti-interference unit is grounded, one end of the voltage reduction unit is used for being connected with an external LED lamp, and the other end of the voltage reduction unit is connected with the LED driving circuit.
2. The control circuit of an LED lamp according to claim 1, wherein the anti-interference unit comprises a sixth resistor R6 and a fifth capacitor C5 connected in parallel, one end of the sixth resistor R6 is connected to a pin CTRL of the first control chip U1, and the other end of the sixth resistor R6 is grounded; one end of the fifth capacitor C5 is connected to the pin CTRL of the first control chip U1, and the other end of the fifth capacitor C5 is grounded.
3. The control circuit of an LED lamp according to claim 1, wherein the step-down unit includes a first diode D1, a second resistor R2, a third capacitor C3, a fourth capacitor C4, and a second inductor L2, one end of the first diode D1 and one end of the second inductor L2 are respectively connected to the pin D1 and the pin D2 of the first control chip U1, the other end of the second inductor L2 is respectively connected to one end of the second resistor R2, one end of the third capacitor C3, and the cathode of the LED lamp, the cathode of the first diode D1, the other end of the second resistor R2, and the other end of the third capacitor C3 are respectively connected to the anode of the LED lamp, one end of the fourth capacitor C4 is connected to the cathode of the LED, and the other end of the fourth capacitor C4 is grounded.
4. The control circuit of an LED lamp according to claim 1, wherein the LED driving circuit further comprises a third resistor R3, a fourth resistor R4 and a fifth resistor R5, one ends of the third resistor R3 and the fourth resistor R4 are respectively connected with a pin CS of the first control chip U1, the other ends of the third resistor R3 and the fourth resistor R4 are grounded, one end of the fifth resistor R5 is connected with a pin ROVP of the first control chip U1, the other end of the fifth resistor R5 is grounded, a pin HV of the first control chip U1 is connected with a rectifying circuit, and a pin CTRL of the first control chip U1 is connected with a microwave induction circuit.
5. The control circuit of an LED lamp according to claim 1, wherein the rectifying circuit comprises a fuse F1, an exciting coil LF1, a rectifier BD1, a first resistor R1, a first inductor L1, a first capacitor C1 and a second capacitor C2, one end of the fuse F1 is connected with a live wire, the other end of the fuse F1 is connected with an input end of the exciting coil LF1, an output end of the exciting coil LF1 is respectively connected with a pin 1 and a pin 2 of the rectifier BD1, a pin 3 of the rectifier BD1 is grounded, one end of the first resistor R1 is respectively connected with a pin 4 of the rectifier BD1, one end of the first inductor L1 and one end of the first capacitor C1, a common connection point of the other end of the first resistor R1, the other end of the first capacitor L1 and one end of the second capacitor C2 is used as an output end of the rectifying circuit, and the other end of the first capacitor C1 and the other end of the second capacitor C2 are respectively grounded.
6. The control circuit of an LED lamp according to claim 1, wherein the regulated power supply circuit comprises a second control chip U2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a third inductor L3, a sixth capacitor C6, a seventh capacitor C7, and a second diode D2; the pin D of the second control chip U2 is connected with a rectifying circuit, one end of a seventh resistor R7 is connected with the pin FB of the second control chip U2, the other end of the seventh resistor R7 is connected with one end of a seventh capacitor C7, the other end of the seventh capacitor C7 is grounded, one end of an eighth resistor R8 is connected with the pin FB of the second control chip U2, the other end of the eighth resistor R8 and one end of a third inductor L3 are respectively connected with the pin GND of the second control chip U2, the other end of the third inductor L3 is respectively connected with a microwave induction circuit and one end of a ninth resistor R9, the other end of the ninth resistor R9 is grounded, one end of a sixth capacitor C6 is connected with the pin VCC of the second control chip U2, the cathode of the second diode D2 is respectively connected with the other end of the sixth capacitor C6 and the pin GND of the second control chip U2, and the anode of the second diode D2 is grounded.
7. The control circuit of an LED lamp according to claim 1, wherein the microwave sensing circuit comprises a microwave radar sensor P1, a pin VCC of the microwave radar sensor P1 is connected to a voltage-stabilizing power supply circuit, a pin OUT of the microwave radar sensor P1 is connected to a pin CTRL of the first control chip U1, and a pin GND of the microwave radar sensor P1 is grounded.
8. An LED lamp comprising a printed circuit board, wherein the printed circuit board has printed thereon a control circuit for the LED lamp according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320067131.6U CN219577309U (en) | 2023-01-06 | 2023-01-06 | LED lamp and control circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320067131.6U CN219577309U (en) | 2023-01-06 | 2023-01-06 | LED lamp and control circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219577309U true CN219577309U (en) | 2023-08-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320067131.6U Active CN219577309U (en) | 2023-01-06 | 2023-01-06 | LED lamp and control circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219577309U (en) |
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2023
- 2023-01-06 CN CN202320067131.6U patent/CN219577309U/en active Active
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