CN111148320A - Light control circuit of LED lamp - Google Patents
Light control circuit of LED lamp Download PDFInfo
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- CN111148320A CN111148320A CN202010035260.8A CN202010035260A CN111148320A CN 111148320 A CN111148320 A CN 111148320A CN 202010035260 A CN202010035260 A CN 202010035260A CN 111148320 A CN111148320 A CN 111148320A
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Abstract
The invention discloses a light control circuit of an LED lamp, which comprises a constant current drive circuit, a power supply circuit and a light control circuit with a photosensitive device and a single chip microcomputer, wherein the input end of the constant current drive circuit is connected with commercial power, one path of the output end of the constant current drive circuit is connected with the input end of the power supply circuit, the other path of the output end of the constant current drive circuit is connected with an LED load, the power supply circuit supplies power to the single chip microcomputer, the output end of the light control circuit is connected with the LED load, and two voltage threshold values are arranged; the LED load lighting circuit has the advantages that when the maximum voltage detected by the single chip microcomputer is smaller than a first voltage threshold value after the photosensitive device senses the brightness of the external environment, the single chip microcomputer outputs a PWM signal to light an LED load, in the process of lighting the LED load, the minimum voltage sensed by the photosensitive device to the brightness of the LED load is 0, the photosensitive device is not affected by light of the LED load, and when the minimum voltage of the sum of the brightness sensed by the photosensitive device and the brightness sensed by the lamp after the lamp is lit is larger than a second voltage threshold value, the single chip microcomputer 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 is widely applied to various illumination places as an efficient, energy-saving and environment-friendly illumination product. In order to enable the LED lamp to automatically turn off when the external environment is bright and automatically turn on when the external environment is dark, researchers design a driving circuit which controls the LED lamp by adopting a photosensitive device to sense the brightness change of the external environment. However, the photosensitive devices in the existing light control circuits are easily interfered by the light of the LED lamps, such as: when the LED lamp is lighted, the light can be reflected to the photosensitive device through the reflecting cover or the lampshade, however, the light-operated circuit is easily triggered by mistake, and the using effect of the LED lamp can be influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing an optical control circuit of an LED lamp, which can prevent a photosensitive device from being interfered by the light of the LED lamp, so that the LED lamp does not flicker visibly.
The technical scheme adopted by the invention for solving the technical problems is as follows: the light control circuit of the LED lamp is characterized in that: the LED constant-current driving circuit comprises a constant-current driving circuit, a power supply circuit and an optical control circuit, wherein the optical control circuit is provided with a photosensitive device and a single chip microcomputer, 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 single chip microcomputer in the optical control circuit to supply power to the single chip microcomputer, the single chip microcomputer is connected with the photosensitive device, the output end of the optical control circuit is connected with the LED load, a first voltage threshold value and a second voltage threshold value are preset in the single chip microcomputer, and the first voltage threshold value is; when the photosensitive device senses the brightness of the external environment and the brightness of the LED load after the LED load is lightened, the minimum illumination of the photosensitive device sensing the brightness of the LED load is 0lx, the voltage detected by the single chip microcomputer is 0V, and when the illumination of the sum of the brightness of the photosensitive device sensing the brightness of the external environment and the brightness of the LED load after the LED load is lightened, the minimum voltage value detected by the single chip microcomputer is larger than the second voltage threshold value, the single chip microcomputer outputs 0, so that the LED load is extinguished.
The power supply circuit is a constant voltage power supply circuit and consists of a three-terminal voltage regulator, a fourth resistor, a fifth resistor, a first capacitor, a first voltage stabilizing diode and a first triode, one end of the fourth resistor is respectively connected with the output end of the constant current driving 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 anode of the first voltage stabilizing diode and the 1 st pin of the three-terminal voltage stabilizer are all grounded, the other end of the fifth resistor is connected with the collector of the first triode, the emitter of the first triode is connected with the 2 nd pin of the three-terminal regulator, and the 3 rd pin of the three-terminal regulator is connected with the single chip microcomputer.
The light control circuit consists of the singlechip, a first MOS (metal oxide semiconductor) tube, the 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 phototriode, a 1 st pin of the singlechip is respectively connected with a collector of the phototriode, one end of the second capacitor, one end of the third capacitor and an output end of the power supply circuit, a 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 (light-emitting diode) load, a source electrode of the first MOS tube is grounded, a 7 th pin of the singlechip is respectively connected with one end of the sixth resistor and an emitter electrode of the phototriode, and a 8 th pin of the singlechip is respectively connected with the other end of the sixth resistor, The other end of the second capacitor is connected with the other end of the third capacitor, the common connecting end of the second capacitor is grounded, and the rest pins of the single chip microcomputer are suspended. The singlechip senses the external environment and the change of the brightness of the LED lamp by virtue of the phototriode and outputs different currents to the sixth resistor, so that the voltage change sensed by the singlechip at two ends of the sixth resistor is compared with a set voltage threshold value in the singlechip, whether a 2 nd pin of the singlechip outputs a PWM (pulse width modulation) signal to the first MOS (metal oxide semiconductor) tube or not is controlled, and whether the LED load is lightened or not is controlled by switching on and off of the first MOS tube; the phototriode can also be replaced by a photodiode.
The type of the single chip microcomputer is NY8A 051A.
The constant current driving circuit is a switching power supply or a linear constant current circuit.
The switch 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 and 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 of KP1072, wherein 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 wire of the mains supply, one output end of the rectifier bridge stack is respectively connected with the anode of the first electrolytic capacitor, the 4 th pin of the BUCK chip, the cathode of the first diode, the anode of the second electrolytic capacitor, the cathode of the second electrolytic capacitor, The LED drive circuit is characterized in that one end of a third resistor, the anode of an LED load and the input end of a power supply circuit are connected, the other output end of a rectifier bridge stack is respectively connected with the cathode of a first electrolytic capacitor, the 1 st pin of a BUCK chip, one end of the first resistor and one end of a second resistor, the anode of a first diode is respectively connected with one end of a 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 cathode of the second electrolytic capacitor and the other end of the third resistor, the common connecting end of the second diode 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 value is 1V, and the second voltage threshold value is 2V; or the first voltage threshold value and the second voltage threshold value are both 1V.
Compared with the prior art, the invention has the advantages that:
a first voltage threshold and a second voltage threshold are preset in a singlechip in the light control circuit, after the photosensitive device senses the brightness of the external environment, when the maximum voltage value detected by the singlechip is smaller than the first voltage threshold value, the singlechip outputs a PWM signal to light the LED load, in the process of lighting the LED load, the minimum illumination induced by the photosensitive device to the self brightness of the LED load is 0lx, so that the minimum voltage value detected by the singlechip is 0V, therefore, the photosensitive device is not influenced by the light of the LED load, if the illumination of the sum of the brightness of the photosensitive device after sensing the brightness of the external environment and the brightness of the LED load after being lightened enables the minimum voltage value detected by the singlechip to be always smaller than the second voltage threshold value, the LED load is lightened all the time, and the visible flicker phenomenon can not occur, namely the photosensitive device can not be interfered by the light of the LED load.
Drawings
FIG. 1 is a schematic diagram of the composition of a light control circuit of 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 accompanying examples.
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 single chip microcomputer U2, the input end of the constant current drive circuit 1 is connected with a 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 1 is connected with an LED load 4, the output end of the power supply circuit 2 is connected with a single chip microcomputer U2 in the light control circuit 3 to supply power for the single chip microcomputer U2, the single chip microcomputer U2 is connected with the photosensitive device 31, the output end 539 of the light control circuit 3 is connected with the LED load 4, a first voltage threshold value and a second voltage threshold value; when the photosensitive device 31 senses the brightness of the external environment and the maximum voltage value detected by the single chip microcomputer U2 is smaller than the first voltage threshold value, the single chip microcomputer U2 outputs a PWM signal to light the LED load 4, the minimum illumination when the photosensitive device 31 senses the brightness of the LED load 4 is 0lx in the lighting process of the LED load 4, the current flowing through the light control circuit 3 by the photosensitive device 31 approaches 0mA at the moment, the voltage detected by the single chip microcomputer U2 is 0V, and when the minimum voltage value detected by the single chip microcomputer U2 is larger than the second voltage threshold value due to the illumination of the sum of the brightness after the photosensitive device 31 senses the brightness of the external environment and the brightness after the LED load 4 is lighted, the single chip microcomputer U2 outputs 0 to extinguish the LED load 4.
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 specific implementation, the switching power supply selects a BUCK circuit, the BUCK circuit is composed 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 of KP1072 type, 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 BD 7 is connected with a zero line 874N of the mains supply, one output end of the rectifier bridge stack BD1 is respectively connected with a positive electrode CD1 of the first electrolytic capacitor CD1, a negative electrode of the first diode R1, a negative electrode 1 of the first diode R1 and a negative electrode 1 of the first diode R1, The positive electrode of the LED load 4 is connected with the input end of the power supply circuit 2, the other output end of the rectifier bridge stack BD1 is respectively connected with the negative electrode 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 positive electrode of the first diode D1 is respectively connected with one end of the second inductor L2 and the 5 th and 6 th pins of the BUCK chip U1, the other end of the second inductor L2 is respectively connected with the negative electrode of the second electrolytic capacitor CD2 and the other end of the third resistor R3, the common connection end of the second inductor L2 is grounded, the other end of the first resistor R1 and the other end of the second resistor R2 are respectively connected with the 7 th pin of the BUCK chip U1, and the other pins of the BUCK chip U1 are suspended.
In this embodiment, the power supply circuit 2 is a constant voltage power supply circuit, and 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, one end of the fourth resistor R4 is connected to the output end of the constant current driving circuit 1 and one end of the fifth resistor R5, the other end of the fourth resistor R4 is connected to the base of the first triode Q1, one end of the first capacitor C1, and the negative electrode of the first zener diode ZD1, the other end of the first capacitor C1, the anode 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 to the collector of the first triode Q1, the emitter of the first triode Q1 is connected to the 2 nd pin of the three-terminal regulator, and the 3 rd pin of the LDO is connected to the single chip U2.
In this embodiment, the light control circuit 3 is composed of a single chip microcomputer U2 with 8 pins and model number NY8a051A, a first MOS transistor M1, a photosensor 31, a second capacitor C2, a third capacitor C3 and a sixth resistor R6, the photosensor 31 is a phototransistor G1, the 1 st pin of the single chip microcomputer U2 is connected with the collector of the phototransistor G1, one end of a second capacitor C2, one end of a third capacitor C3 and the output end of the power supply circuit 2, the 2 nd pin of the single chip microcomputer 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 single chip microcomputer U2 is connected with one end of the sixth resistor R6 and the emitter of the phototransistor G1, the 8 th pin of the single chip microcomputer U2 is connected with the other end of the sixth resistor R6, the other end of the second capacitor C2, the third capacitor C9634 and the common connection end of the single chip microcomputer U3, the other pins of the singlechip U2 are suspended. The singlechip U2 senses the external environment and the change of the brightness 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 of two ends of the sixth resistor R6 and compares the voltage change with a first voltage threshold or a second voltage threshold set in the singlechip U2, and then whether a 2 nd pin of the singlechip U2 outputs a PWM signal to the first MOS tube M1 or not is controlled, and whether the LED load 4 is lightened or not is controlled through the on-off of the first MOS tube M1; the phototransistor G1 may also be replaced with a photodiode.
A first voltage threshold and a second voltage threshold are preset in the single chip microcomputer U2 and are correspondingly marked as th1 and th2, the power supply voltage of the single chip microcomputer U2 is 5V, the saturation current of the phototriode G1 is 50 muA, when the voltage of the current input after the phototriode G1 senses the brightness change of the external environment on a sixth resistor R6 is smaller than th1, a PWM signal with the frequency of 100HZ and the duty ratio of 80% is output to a first MOS tube M1 by a pin 2 of the single chip microcomputer U2, and the LED load 4 is lightened; in the state that the LED load 4 is turned on, because the 2 nd pin of the U2 outputs a PWM square wave with a frequency of 100HZ and a duty ratio of 80%, that is, in 0.01 second, the LED load 4 is turned on for 0.008 second, and the LED load 4 is turned off for 0.002 second, because the phototransistor G1 can sense the fluctuation of the PWM signal when the LED load 4 is turned on, when the LED load 4 is turned on in a dark environment, the theoretical value of the minimum voltage collected by the 7 th pin of the U2 is 0 (i.e., the state when the LED load 4 is turned off for 0.002 second), as the external environment turns on, the minimum optical signal collected by the phototransistor G1 is gradually increased (which is the sum of the brightness of the external environment and the minimum voltage collected when the LED load 4 is turned on), the minimum current input by the phototransistor G1 is gradually increased, so that the value of the minimum voltage at the 7 th pin of the U2 is gradually increased, when the voltage at the 7 th pin of the U2 is higher than 2, the output of the 2 nd pin of the singlechip U2 is 0, and the LED load 4 is extinguished. 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, which corresponds to setting a voltage threshold; when th1 and th2 are different, th1 may be set to 1V and th2 may be set to 2V.
Here, the bridge rectifier BD1 is made up 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 is preset in the singlechip U2, the voltage is compared with the voltage threshold, and the output of the PWM signal can be realized by the conventional technical means.
Claims (8)
1. The light control circuit of the LED lamp is characterized in that: the LED constant-current driving circuit comprises a constant-current driving circuit, a power supply circuit and an optical control circuit, wherein the optical control circuit is provided with a photosensitive device and a single chip microcomputer, 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 single chip microcomputer in the optical control circuit to supply power to the single chip microcomputer, the single chip microcomputer is connected with the photosensitive device, the output end of the optical control circuit is connected with the LED load, a first voltage threshold value and a second voltage threshold value are preset in the single chip microcomputer, and the first voltage threshold value is; when the photosensitive device senses the brightness of the external environment and the brightness of the LED load after the LED load is lightened, the minimum illumination of the photosensitive device sensing the brightness of the LED load is 0lx, the voltage detected by the single chip microcomputer is 0V, and when the illumination of the sum of the brightness of the photosensitive device sensing the brightness of the external environment and the brightness of the LED load after the LED load is lightened, the minimum voltage value detected by the single chip microcomputer is larger than the second voltage threshold value, the single chip microcomputer outputs 0, so that the LED load is extinguished.
2. The light control circuit of an LED lamp of claim 1, wherein: the power supply circuit is a constant voltage power supply circuit and consists of a three-terminal voltage regulator, a fourth resistor, a fifth resistor, a first capacitor, a first voltage stabilizing diode and a first triode, one end of the fourth resistor is respectively connected with the output end of the constant current driving 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 anode of the first voltage stabilizing diode and the 1 st pin of the three-terminal voltage stabilizer are all grounded, the other end of the fifth resistor is connected with the collector of the first triode, the emitter of the first triode is connected with the 2 nd pin of the three-terminal regulator, and the 3 rd pin of the three-terminal regulator is connected with the single chip microcomputer.
3. The light control circuit of an LED lamp according to claim 1 or 2, wherein: the light control circuit consists of the singlechip, a first MOS (metal oxide semiconductor) tube, the 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 phototriode, a 1 st pin of the singlechip is respectively connected with a collector of the phototriode, one end of the second capacitor, one end of the third capacitor and an output end of the power supply circuit, a 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 (light-emitting diode) load, a source electrode of the first MOS tube is grounded, a 7 th pin of the singlechip is respectively connected with one end of the sixth resistor and an emitter electrode of the phototriode, and a 8 th pin of the singlechip is respectively connected with the other end of the sixth resistor, The other end of the second capacitor is connected with the other end of the third capacitor, the common connecting end of the second capacitor is grounded, and the rest pins of the single chip microcomputer are suspended.
4. The light control circuit of an LED lamp of claim 3, wherein: the type of the single chip microcomputer is NY8A 051A.
5. The light control circuit of an LED lamp of claim 3, wherein: the constant current driving circuit is a switching power supply or a linear constant current circuit.
6. The light control circuit of an LED lamp of claim 5, wherein: the switch power supply is one of a BUCK circuit, a BUCK-BOOST circuit, a Flyback circuit and a BOOST circuit.
7. The light control circuit of an LED lamp of claim 6, wherein: the switching power supply is a BUCK circuit and 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 of KP1072, wherein 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 wire of the mains supply, one output end of the rectifier bridge stack is respectively connected with the anode of the first electrolytic capacitor, the 4 th pin of the BUCK chip, the cathode of the first diode, the anode of the second electrolytic capacitor, the cathode of the second electrolytic capacitor, The LED drive circuit is characterized in that one end of a third resistor, the anode of an LED load and the input end of a power supply circuit are connected, the other output end of a rectifier bridge stack is respectively connected with the cathode of a first electrolytic capacitor, the 1 st pin of a BUCK chip, one end of the first resistor and one end of a second resistor, the anode of a first diode is respectively connected with one end of a 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 cathode of the second electrolytic capacitor and the other end of the third resistor, the common connecting end of the second diode 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.
8. The light control circuit of an LED lamp of claim 1, wherein: the first voltage threshold value is 1V, and the second voltage threshold value is 2V; or the first voltage threshold value and the second voltage threshold value are both 1V.
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| CN112040615A (en) * | 2020-08-20 | 2020-12-04 | 宁波凯耀电器制造有限公司 | Light control method and circuit for lamp |
| CN113873710A (en) * | 2021-08-13 | 2021-12-31 | 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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| Publication number | Publication date |
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| CN111148320B (en) | 2024-06-07 |
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