CN111148320B - Light control circuit of LED lamp - Google Patents
Light control circuit of LED lamp Download PDFInfo
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- CN111148320B CN111148320B CN202010035260.8A CN202010035260A CN111148320B CN 111148320 B CN111148320 B CN 111148320B CN 202010035260 A CN202010035260 A CN 202010035260A CN 111148320 B CN111148320 B CN 111148320B
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- 239000003990 capacitor Substances 0.000 claims description 47
- 238000005286 illumination Methods 0.000 claims description 10
- 239000003381 stabilizer Substances 0.000 claims description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses a light control circuit of an LED lamp, which comprises a constant current driving circuit, a power supply circuit and a light control circuit with a photosensitive device and a singlechip, wherein the input end of the constant current driving circuit is connected with mains supply, one path of the output end of the constant current driving circuit is connected with the input end of the power supply circuit, the other path of the output end of the constant current driving circuit is connected with an LED load, the power supply circuit supplies power for the singlechip, the output end of the light control circuit is connected with the LED load, and two voltage thresholds are arranged in the singlechip; the LED load lighting device has the advantages that when the photosensitive device senses the brightness of the external environment, the maximum voltage detected by the singlechip is smaller than the first voltage threshold, the singlechip outputs PWM signals to light the LED load, and when the LED load is lighted, the minimum voltage of the photosensitive device which senses the brightness of the LED load is 0, so that the photosensitive device is not influenced by the light of the LED load, and when the minimum voltage of the sum of the brightness of the photosensitive device which senses the brightness of the external environment and the brightness of the lamp which is lighted is larger than the second voltage threshold, the singlechip outputs 0 to extinguish the LED load.
Description
Technical Field
The invention relates to a light control technology of an LED lamp, in particular to a light control circuit of the LED lamp.
Background
The LED lamp has been widely used in various illumination places as an efficient, energy-saving, and environment-friendly illumination product. In order to enable the LED lamp to automatically extinguish when the external environment is bright and automatically light when the external environment is dark, researchers design a driving circuit for controlling the LED lamp by adopting a photosensitive device to sense the brightness change of the external environment. However, the photosensitive device in the existing light control circuit is easily interfered by the light of the LED lamp, for example: when the LED lamp is lighted, the lamplight can be reflected to the photosensitive device through the reflecting cover or the lampshade, however, the light control circuit is easy to trigger by mistake, and the using effect of the LED lamp can be affected.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the light control circuit of the LED lamp, which can prevent the photosensitive device from being interfered by the light of the LED lamp, so that the LED lamp cannot generate visible flickering phenomenon.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a light-operated circuit of LED lamp which characterized in that: the LED light source comprises a constant current driving circuit, a power supply circuit and a light control circuit, wherein the light control circuit is provided with a photosensitive device and a singlechip, the input end of the constant current driving circuit is connected with a mains supply, one path of the output end of the constant current driving circuit is connected with the input end of the power supply circuit, the other path of the output end of the constant current driving circuit is connected with an LED load, the output end of the power supply circuit is connected with the singlechip in the light control circuit to supply power for the singlechip, the singlechip is connected with the photosensitive device, the output end of the light control circuit is connected with an LED load, a first voltage threshold value and a second voltage threshold value are preset in the singlechip, and the first voltage threshold value is smaller than or equal to the second voltage threshold value; when the photosensitive device senses the external environment brightness and then enables the maximum voltage value detected by the singlechip to be smaller than a first voltage threshold value, the singlechip outputs PWM signals to enable an LED load to be lightened, the minimum illumination of the brightness of the photosensitive device sensed by the LED load in the process of lightening the LED load is 0lx, the voltage detected by the singlechip is 0V, and when the illumination of the sum of the brightness of the photosensitive device sensed by the external environment brightness and the brightness of the LED load is enabled to enable the minimum voltage value detected by the singlechip to be larger than a second voltage threshold value, the singlechip outputs 0 to enable the LED load to be extinguished.
The power supply circuit is a constant voltage power supply circuit, and consists of a three-terminal voltage stabilizer, a fourth resistor, a fifth resistor, a first capacitor, a first voltage stabilizing diode and a first triode, wherein one end of the fourth resistor is respectively connected with the output end of the constant current drive circuit and one end of the fifth resistor, the other end of the fourth resistor is respectively connected with the base electrode of the first triode, one end of the first capacitor and the negative electrode of the first voltage stabilizing diode, the other end of the first capacitor, the positive electrode of the first voltage stabilizing diode and the 1 st pin of the three-terminal voltage stabilizer are grounded, the other end of the fifth resistor is connected with the collector electrode of the first triode, the emitter electrode of the first triode is connected with the 2 nd pin of the three-terminal voltage stabilizer, and the 3 rd pin of the three-terminal voltage stabilizer is connected with the singlechip.
The light control circuit comprises a singlechip, a first MOS tube, a photosensitive device, a second capacitor, a third capacitor and a sixth resistor, wherein the singlechip is an 8-pin singlechip, the photosensitive device is a phototransistor, the 1 st pin of the singlechip is respectively connected with a collector electrode of the phototransistor, one end of the second capacitor, one end of the third capacitor and the output end of the power supply circuit, the 2 nd pin of the singlechip is connected with a grid electrode of the first MOS tube, a drain electrode of the first MOS tube is connected with a cathode of an LED load, a source electrode of the first MOS tube is grounded, the 7 th pin of the singlechip is respectively connected with one end of the sixth resistor and an emitter electrode of the phototransistor, the 8 th pin of the singlechip is respectively connected with the other end of the sixth resistor, the other end of the second capacitor and the other end of the third capacitor, and the other end of the third capacitor are commonly connected with the other end of the singlechip, and the other end of the singlechip is connected with the other end of the phototriode, and the other pin is connected with the other end of the common pin. The singlechip senses the external environment and the brightness change of the LED lamp to output different currents to the sixth resistor through the phototriode, so that the singlechip senses the voltage change at two ends of the sixth resistor and compares the voltage change with a voltage threshold value set in the singlechip, thereby controlling whether a 2 nd pin of the singlechip outputs a PWM signal to the first MOS tube or not, and controlling whether the LED load is lighted or not through the on-off of the first MOS tube; the phototransistor can also be replaced by a photodiode.
The model of the singlechip is NY8A051A.
The constant current driving circuit is a switching power supply or a linear constant current circuit.
The switching power supply is one of a BUCK circuit, a BUCK-BOOST circuit, a Flyback circuit and a BOOST circuit.
The switching power supply is a BUCK circuit, which consists of a fuse, a first inductor, a second inductor, a first resistor, a second resistor, a third resistor, a seventh resistor, a rectifier bridge stack, a first electrolytic capacitor, a second electrolytic capacitor, a first diode and a BUCK chip with the model KP1072, one end of the fuse is connected with a live wire of a mains supply, the other end of the fuse is connected with one end of the first inductor, the other end of the first inductor is connected with one input end of the rectifier bridge stack, the seventh resistor is connected with the first inductor in parallel, the other input end of the rectifier bridge stack is connected with a zero line of the mains supply, one output end of the rectifier bridge stack is respectively connected with the positive electrode of the first electrolytic capacitor, the 4 th pin of the BUCK chip, the negative electrode of the first diode, the positive electrode of the second electrolytic capacitor, one end of the third resistor, the positive electrode of the LED load and the input end of the power supply circuit, the other output end of the rectifier bridge stack is respectively connected with the negative electrode of the first electrolytic capacitor, the 1 st pin of the BUCK chip, one end of the first resistor and one end of the second resistor, the positive electrode of the first diode is respectively connected with one end of the second inductor, the 5 th pin and the 6 th pin of the BUCK chip, the other end of the second inductor is respectively connected with the negative electrode of the second electrolytic capacitor and the other end of the third resistor, the common connection end of the second inductor is grounded, the other end of the first resistor and the other end of the second resistor are respectively connected with the 7 th pin of the BUCK chip, and the other pins of the BUCK chip are suspended.
The first voltage threshold is 1V, and the second voltage threshold is 2V; or the first voltage threshold and the second voltage threshold are both 1V.
Compared with the prior art, the invention has the advantages that:
the method comprises the steps that a first voltage threshold value and a second voltage threshold value are preset in a singlechip in a light control circuit, after the photosensitive device senses the external environment brightness, when the maximum voltage value detected by the singlechip is smaller than the first voltage threshold value, the singlechip outputs PWM signals to enable an LED load to be lightened, and in the process of lightening the LED load, the minimum illumination of the brightness of the LED load sensed by the photosensitive device is 0lx, the minimum voltage value detected by the singlechip is 0V, so that the photosensitive device is not influenced by LED load lamplight, and therefore, if the illumination of the sum of the brightness of the photosensitive device and the brightness of the LED load sensed by the photosensitive device is always smaller than the second voltage threshold value, the LED load is always lightened, and no visible flickering phenomenon occurs, so that the photosensitive device cannot be interfered by the LED load lamplight.
Drawings
FIG. 1 is a schematic diagram of a photo control circuit according to the present invention;
fig. 2 is a specific circuit diagram of the light control circuit of the present invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
The invention provides a light control circuit of an LED lamp, which comprises a constant current drive circuit 1, a power supply circuit 2 and a light control circuit 3, wherein the light control circuit 3 is provided with a photosensitive device 31 and a singlechip U2, the input end of the constant current drive circuit 1 is connected with mains supply, one path of the output end of the constant current drive circuit 1 is connected with the input end of the power supply circuit 2, the other path of the output end of the constant current drive circuit is connected with an LED load 4, the output end of the power supply circuit 2 is connected with the singlechip U2 in the light control circuit 3 to supply power to the singlechip U2, the singlechip U2 is connected with the photosensitive device 31, the output end of the light control circuit 3 is connected with the LED load 4, a first voltage threshold and a second voltage threshold are preset in the singlechip U2, and the first voltage threshold is smaller than or equal to the second voltage threshold; when the photosensitive device 31 senses the external environment brightness and then enables the maximum voltage value detected by the singlechip U2 to be smaller than a first voltage threshold value, the singlechip U2 outputs PWM signals to enable the LED load 4 to be lighted, the minimum illumination of the brightness of the photosensitive device 31 sensing the LED load 4 in the process of lighting the LED load 4 is 0lx, the current flowing through the light control circuit 3 by the photosensitive device 31 is approximately 0mA, the voltage detected by the singlechip U2 is 0V, and when the illumination of the sum of the brightness of the photosensitive device 31 sensing the external environment brightness and the brightness of the LED load 4 is enabled to enable the minimum voltage value detected by the singlechip U2 to be larger than a second voltage threshold value, the singlechip U2 outputs 0 to enable the LED load 4 to be extinguished.
In this embodiment, the constant current driving circuit 1 may be a switching power supply, or may be an existing linear constant current circuit, and the switching power supply may be one of a BUCK circuit, a BUCK-BOOST circuit, a Flyback circuit and a BOOST circuit. In the specific implementation, the switching power supply selects a BUCK circuit, the BUCK circuit consists of a fuse F1, a first inductor L1, a second inductor L2, a first resistor R1, a second resistor R2, a third resistor R3, a seventh resistor R7, a rectifier bridge stack BD1, a first electrolytic capacitor CD1, a second electrolytic capacitor CD2, a first diode D1 and a BUCK chip U1 with the model KP1072, one end of the fuse F1 is connected with a live wire L of a mains supply, the other end of the fuse F1 is connected with one end of the first inductor L1, the other end of the first inductor L1 is connected with one input end of the rectifier bridge stack BD1, the seventh resistor R7 is connected with the first inductor L1 in parallel, the other input end of the rectifier bridge stack BD1 is connected with a zero line N of the mains supply, one output end of the rectifier bridge BD1 is respectively connected with the anode of the first electrolytic capacitor CD1, the 4 th pin of the BUCK chip U1, the cathode of the first diode D1, the anode of the second electrolytic capacitor CD2, one end of the third resistor R3, the anode of the LED load 4 and the input end of the power supply circuit 2, the other output end of the rectifier bridge BD1 is respectively connected with the cathode of the first electrolytic capacitor CD1, the 1 st pin of the BUCK chip U1, one end of the first resistor R1 and one end of the second resistor R2, the anode of the first diode D1 is respectively connected with one end of the second inductor L2, the 5 th pin and the 6 th pin of the BUCK chip U1, the other end of the second inductor L2 is respectively connected with the cathode of the second electrolytic capacitor CD2 and the other end of the third resistor R3, and the common connection end of the common connection end is grounded, and the other end of the first resistor R1 is respectively connected with the 7 th pin of the BUCK chip U1, and the rest pins of the BUCK chip U1 are suspended.
In this embodiment, the power supply circuit 2 is a constant voltage power supply circuit, which is composed of a three-terminal regulator LDO, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a first zener diode ZD1, and a first triode Q1, wherein one end of the fourth resistor R4 is connected with the output end of the constant current drive circuit 1 and one end of the fifth resistor R5, the other end of the fourth resistor R4 is connected with the base of the first triode Q1, one end of the first capacitor C1 and the cathode of the first zener diode ZD1, the other end of the first capacitor C1, the positive electrode of the first zener diode ZD1, and the 1 st pin of the three-terminal regulator LDO are all grounded, the other end of the fifth resistor R5 is connected with the collector of the first triode Q1, the emitter of the first triode Q1 is connected with the 2 nd pin of the three-terminal regulator LDO, and the 3 rd pin of the three-terminal regulator LDO is connected with the singlechip U2.
In this embodiment, the light control circuit 3 is composed of a singlechip U2 with 8 pins and model NY8a051A, a first MOS transistor M1, a photosensitive device 31, a second capacitor C2, a third capacitor C3 and a sixth resistor R6, the photosensitive device 31 is a phototransistor G1, the 1 st pin of the singlechip U2 is respectively connected with the collector of the phototransistor G1, one end of the second capacitor C2, one end of the third capacitor C3 and the output end of the power supply circuit 2, the 2 nd pin of the singlechip U2 is connected with the gate of the first MOS transistor M1, the drain of the first MOS transistor M1 is connected with the cathode of the LED load 4, the source of the first MOS transistor M1 is grounded, the 7 th pin of the singlechip U2 is respectively connected with one end of the sixth resistor R6 and the emitter of the phototransistor G1, the 8 th pin of the singlechip U2 is respectively connected with the other end of the sixth resistor R6, the other end of the second capacitor C2 and the other end of the third capacitor C3, and the other end of the common connection terminal is grounded, and the rest of the singlechip U2 is suspended. The singlechip U2 senses the external environment and the brightness change of the LED lamp through the phototriode G1 and outputs different currents to the sixth resistor R6, so that the singlechip U2 senses the voltage change at two ends of the sixth resistor R6 and compares the voltage change with a first voltage threshold value or a second voltage threshold value set in the singlechip U2, thereby controlling whether a2 nd pin of the singlechip U2 outputs a PWM signal to the first MOS tube M1 or not and controlling whether the LED load 4 is lightened or not through the on-off of the first MOS tube M1; the phototransistor G1 can also be replaced by a photodiode.
A first voltage threshold value and a second voltage threshold value are preset in the singlechip U2 and are correspondingly recorded as th1 and th2, the power supply voltage of the singlechip U2 is 5V, the saturation current of the phototransistor G1 is 50 mu A, when the phototransistor G1 senses that the voltage of the current input on the sixth resistor R6 after the change of the brightness of the external environment is smaller than th1, the 2 nd pin of the singlechip U2 outputs a PWM signal with the frequency of 100HZ and the duty ratio of 80% to the first MOS tube M1, so that the LED load 4 is lightened; in the state that the LED load 4 is on, because the 2 nd pin of the single-chip microcomputer U2 outputs a PWM square wave with the frequency of 100HZ and the duty ratio of 80%, that is, in 0.01 seconds, the 0.008 seconds LED load 4 is on, and the 0.002 seconds LED load 4 is off, because the phototransistor G1 can sense the fluctuation of the PWM signal when the LED load 4 is on, when the LED load 4 is on in a dark environment, the theoretical value of the minimum voltage collected by the 7 th pin of the single-chip microcomputer U2 is 0 (that is, the state when the 0.002 seconds LED load 4 is off), as the external environment becomes on, the minimum light signal collected by the phototransistor G1 is gradually increased (the sum of the external environment brightness and the minimum voltage collected when the LED load 4 is on), the minimum current input by the phototransistor G1 is gradually increased, so that the minimum voltage value on the 7 th pin of the single-chip microcomputer U2 is gradually increased, and when the voltage on the 7 th pin of the single-chip microcomputer U2 is higher than th2, the 2 nd pin of the single-chip microcomputer U2 outputs 0 LED load 4. th1 and th2 may be the same or different, and when th1 and th2 are the same, th1 and th2 may be set to 1V, that is, a voltage threshold is set; when th1 and th2 are different, th1 may be set to 1V and th2 may be set to 2V.
The rectifier bridge BD1 is composed of four diodes according to the prior art; the LED load 4 is formed by connecting a plurality of LED lamp beads in series; the voltage threshold value is preset in the singlechip U2, the voltage and the voltage threshold value are compared, and the output of PWM signals can be realized through conventional technical means.
Claims (5)
1. The utility model provides a light-operated circuit of LED lamp which characterized in that: the LED light source comprises a constant current driving circuit, a power supply circuit and a light control circuit, wherein the light control circuit is provided with a photosensitive device and a singlechip, the input end of the constant current driving circuit is connected with a mains supply, one path of the output end of the constant current driving circuit is connected with the input end of the power supply circuit, the other path of the output end of the constant current driving circuit is connected with an LED load, the output end of the power supply circuit is connected with the singlechip in the light control circuit to supply power for the singlechip, the singlechip is connected with the photosensitive device, the output end of the light control circuit is connected with an LED load, a first voltage threshold value and a second voltage threshold value are preset in the singlechip, and the first voltage threshold value is smaller than or equal to the second voltage threshold value; when the photosensitive device senses the external environment brightness and then enables the maximum voltage value detected by the singlechip to be smaller than a first voltage threshold value, the singlechip outputs a PWM signal to enable an LED load to be lightened, the minimum illumination of the brightness of the photosensitive device sensed by the LED load in the process of lightening the LED load is 0 lx, the voltage detected by the singlechip is 0V, and when the illumination of the sum of the brightness of the photosensitive device sensed by the external environment brightness and the brightness of the LED load is enabled to enable the minimum voltage value detected by the singlechip to be larger than a second voltage threshold value, the singlechip outputs 0 to enable the LED load to be extinguished;
The light control circuit consists of the singlechip, a first MOS tube, a photosensitive device, a second capacitor, a third capacitor and a sixth resistor, wherein the singlechip is an 8-pin singlechip, the photosensitive device is a phototransistor, the 1 st pin of the singlechip is respectively connected with a collector electrode of the phototransistor, one end of the second capacitor, one end of the third capacitor and the output end of the power supply circuit, the 2 nd pin of the singlechip is connected with a grid electrode of the first MOS tube, a drain electrode of the first MOS tube is connected with a negative electrode of an LED load, a source electrode of the first MOS tube is grounded, the 7 th pin of the singlechip is respectively connected with one end of the sixth resistor and an emitter electrode of the phototransistor, the 8 th pin of the singlechip is respectively connected with the other end of the sixth resistor, the other end of the second capacitor and the other end of the third capacitor, and the other end of the singlechip is commonly connected with the other end of the third capacitor, and the other end of the singlechip is connected with the other end of the phototriode, and the other pins is connected with the other end of the singlechip in a suspending mode;
the model of the singlechip is NY8A051A;
the first voltage threshold is 1V, and the second voltage threshold is 2V; or the first voltage threshold and the second voltage threshold are both 1V.
2. The light control circuit of claim 1, wherein: the power supply circuit is a constant voltage power supply circuit, and consists of a three-terminal voltage stabilizer, a fourth resistor, a fifth resistor, a first capacitor, a first voltage stabilizing diode and a first triode, wherein one end of the fourth resistor is respectively connected with the output end of the constant current drive circuit and one end of the fifth resistor, the other end of the fourth resistor is respectively connected with the base electrode of the first triode, one end of the first capacitor and the negative electrode of the first voltage stabilizing diode, the other end of the first capacitor, the positive electrode of the first voltage stabilizing diode and the 1 st pin of the three-terminal voltage stabilizer are grounded, the other end of the fifth resistor is connected with the collector electrode of the first triode, the emitter electrode of the first triode is connected with the 2 nd pin of the three-terminal voltage stabilizer, and the 3 rd pin of the three-terminal voltage stabilizer is connected with the singlechip.
3. The light control circuit of claim 1, wherein: the constant current driving circuit is a switching power supply or a linear constant current circuit.
4. A light control circuit for an LED lamp as recited in claim 3, wherein: the switching power supply is one of a BUCK circuit, a BUCK-BOOST circuit, a Flyback circuit and a BOOST circuit.
5. The light control circuit of claim 4, wherein: the switching power supply is a BUCK circuit, which consists of a fuse, a first inductor, a second inductor, a first resistor, a second resistor, a third resistor, a seventh resistor, a rectifier bridge stack, a first electrolytic capacitor, a second electrolytic capacitor, a first diode and a BUCK chip with the model KP1072, one end of the fuse is connected with a live wire of a mains supply, the other end of the fuse is connected with one end of the first inductor, the other end of the first inductor is connected with one input end of the rectifier bridge stack, the seventh resistor is connected with the first inductor in parallel, the other input end of the rectifier bridge stack is connected with a zero line of the mains supply, one output end of the rectifier bridge stack is respectively connected with the positive electrode of the first electrolytic capacitor, the 4 th pin of the BUCK chip, the negative electrode of the first diode, the positive electrode of the second electrolytic capacitor, one end of the third resistor, the positive electrode of the LED load and the input end of the power supply circuit, the other output end of the rectifier bridge stack is respectively connected with the negative electrode of the first electrolytic capacitor, the 1 st pin of the BUCK chip, one end of the first resistor and one end of the second resistor, the positive electrode of the first diode is respectively connected with one end of the second inductor, the 5 th pin and the 6 th pin of the BUCK chip, the other end of the second inductor is respectively connected with the negative electrode of the second electrolytic capacitor and the other end of the third resistor, the common connection end of the second inductor is grounded, the other end of the first resistor and the other end of the second resistor are respectively connected with the 7 th pin of the BUCK chip, and the other pins of the BUCK chip are suspended.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010035260.8A CN111148320B (en) | 2020-01-14 | 2020-01-14 | Light control circuit of LED lamp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010035260.8A CN111148320B (en) | 2020-01-14 | 2020-01-14 | Light control circuit of LED lamp |
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| CN111148320A CN111148320A (en) | 2020-05-12 |
| CN111148320B true CN111148320B (en) | 2024-06-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111526628B (en) * | 2020-06-23 | 2024-01-19 | 横店集团得邦照明股份有限公司 | Circuit for changing light state through flashlight of mobile phone and implementation method thereof |
| CN112040615B (en) * | 2020-08-20 | 2022-12-27 | 宁波凯耀电器制造有限公司 | Light control method and circuit for lamp |
| CN113873710B (en) * | 2021-08-13 | 2024-03-08 | 浙江嘀视科技有限公司 | Light control circuit and light control device using same |
| CN114126137A (en) * | 2021-11-24 | 2022-03-01 | 欧普照明股份有限公司 | LED driving circuit with photosensitive inductive switch and method |
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