CN108650732B - Linear constant-current LED circuit with light sensing function - Google Patents
Linear constant-current LED circuit with light sensing function Download PDFInfo
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- CN108650732B CN108650732B CN201810412756.5A CN201810412756A CN108650732B CN 108650732 B CN108650732 B CN 108650732B CN 201810412756 A CN201810412756 A CN 201810412756A CN 108650732 B CN108650732 B CN 108650732B
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- 239000003990 capacitor Substances 0.000 claims description 51
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- 238000006243 chemical reaction Methods 0.000 description 5
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
Abstract
The invention discloses a linear constant current LED circuit with a light sensing function, which comprises an LED light-emitting circuit, an alternating current-to-direct current circuit, a linear constant current circuit, a light sensing circuit, a parallel voltage stabilizing circuit, a state holding circuit, a voltage smoothing circuit and a resistance voltage dividing circuit, wherein the input end of the voltage smoothing circuit is connected with the input end of the resistance voltage dividing circuit; the method has the advantages of low cost, high cost performance and easy popularization and use on the basis of ensuring high performance.
Description
Technical Field
The invention relates to a linear constant current LED circuit, in particular to a linear constant current LED circuit with a light sensing function.
Background
With the wide use of linear constant current LED circuits, market has also put forward higher requirements for functions other than illumination, and linear constant current LED circuits with light sensing function have been developed. The LED circuit with the light sensing function detects the illuminance in the environment in real time, and is turned on to enter a lighting mode when the detected illuminance is smaller than a reference threshold value set in the LED circuit, and is turned off when the detected illuminance is not smaller than the reference threshold value set in the LED circuit. The linear constant current LED circuit with the light sensing function can be automatically turned on or turned off according to the brightness of the environment, and is widely applied to outdoor street lamp landscapes and indoor corridor illumination.
The conventional linear constant current LED circuit with the light sensing function comprises an LED light-emitting circuit, an alternating current-to-direct current circuit, a linear constant current circuit, a series voltage stabilizing circuit, a light sensing circuit and a singlechip control circuit, as shown in figure 1. The LED light-emitting circuit is provided with a positive input end and a negative input end, the alternating current-to-direct current circuit is provided with a live wire input end, a zero line input end, an output end and a grounding end, the linear constant current circuit is provided with an input end, a control end, an output end and a grounding end, and the serial voltage stabilizing circuit is provided with an input end, an output end and a grounding end; the light sensing circuit is provided with an input end, an output end and a grounding end, and the singlechip control circuit is provided with an input end, a control end, an output end and a grounding end; the input end of the live wire of the alternating current-to-direct current circuit is connected with the live wire of the commercial power, the input end of the zero wire is connected with the zero wire of the commercial power, the output end of the alternating current-to-direct current circuit, the positive input end of the LED light-emitting circuit and the input end of the serial voltage stabilizing circuit are connected, and the negative input end of the LED light-emitting circuit is connected with the output end of the linear constant current circuit; the output end of the series voltage stabilizing circuit, the input end of the linear constant current circuit, the input end of the singlechip control circuit and the input end of the light sensing circuit are connected; the output end of the light sensing circuit is connected with the control end of the single chip microcomputer control circuit, the output end of the single chip microcomputer control circuit is connected with the control end of the linear constant current circuit, and the grounding end of the alternating current-to-direct current circuit, the grounding end of the series voltage stabilizing circuit, the grounding end of the single chip microcomputer control circuit, the grounding end of the light sensing circuit and the grounding end of the linear constant current circuit are connected.
Although the existing linear constant current LED circuit with the light sensing function has higher performance index and certain performance advantage. However, for street lamp or landscape lighting applications only, the cost of the linear constant current LED circuit with light sensing function is also a priority indicator. The serial voltage stabilizing circuit and the singlechip control circuit adopted in the linear constant-current LED circuit are used, wherein the serial voltage stabilizing circuit is required to meet the power supply requirement of the singlechip control circuit, so that the index requirement of the serial voltage stabilizing circuit is higher, the cost is higher, and meanwhile, the use of the singlechip control circuit also increases the cost, so that the cost of the linear constant-current LED circuit is higher, and the competitive advantage of the linear constant-current LED circuit is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a linear constant current LED circuit with a light sensing function, which has low cost on the basis of ensuring high performance.
The technical scheme adopted for solving the technical problems is as follows: the linear constant current LED circuit with the light sensing function comprises an LED light-emitting circuit, an alternating current-to-direct current circuit, a linear constant current circuit and a light sensing circuit, wherein the LED light-emitting circuit is provided with a positive input end and a negative input end, the alternating current-to-direct current circuit is provided with a live wire input end, a zero line input end, an output end and a grounding end, the light sensing circuit is provided with an input end, an output end and a grounding end, the live wire input end of the alternating current-to-direct current circuit is used for connecting a live wire of a mains supply, the zero line input end is used for connecting a zero line of the mains supply, the linear constant current circuit is provided with an input end, a first control end, a second control end, an output end and a grounding end, the negative input end of the LED light-emitting circuit is connected with the output end of the linear constant current circuit, the linear constant current LED circuit is further provided with a parallel-type voltage stabilizing circuit, a state holding circuit, a voltage smoothing circuit and a resistor voltage dividing circuit, the parallel-type voltage stabilizing circuit is provided with an input end, an output end and a grounding end, the state holding circuit is connected with the voltage dividing circuit, the voltage dividing circuit is connected with the input end of the voltage dividing circuit, the voltage circuit is connected with the input end of the voltage dividing circuit, the voltage circuit is connected with the voltage dividing circuit, the output end of the state holding circuit is connected with the second control end of the linear constant current circuit, the output end of the resistor voltage dividing circuit is connected with the first control end of the linear constant current circuit, and the grounding end of the alternating current-to-direct current circuit, the grounding end of the parallel voltage stabilizing circuit, the grounding end of the state holding circuit, the grounding end of the light sensing circuit, the grounding end of the linear constant current circuit, the grounding end of the voltage smoothing circuit and the grounding end of the resistor voltage dividing circuit are connected.
The resistor voltage dividing circuit comprises a first resistor and a second resistor, one end of the first resistor is an input end of the resistor voltage dividing circuit, the other end of the first resistor is connected with one end of the second resistor, the connecting end of the second resistor is an output end of the resistor voltage dividing circuit, and the other end of the second resistor is a grounding end of the resistor voltage dividing circuit. In the circuit, the high voltage output by the alternating current-to-direct current circuit is converted into the low voltage suitable for the linear constant current circuit to work by dividing the voltage through the first resistor and the second resistor, so that the normal working signal sampling of the linear constant current circuit is ensured, the structure is simple, and the cost is lower.
The voltage smoothing circuit comprises a first capacitor and a first diode, wherein the first diode is a rectifier diode, the first capacitor is an electrolytic capacitor, the positive electrode of the first diode is an input end of the voltage smoothing circuit, the negative electrode of the first diode is connected with the positive electrode of the first capacitor, the connecting end of the positive electrode of the first diode is an output end of the voltage smoothing circuit, and the negative electrode of the first capacitor is a grounding end of the voltage smoothing circuit. The circuit carries out filtering through the first capacitor, converts direct current voltage with great voltage fluctuation output by the alternating current-direct current circuit into direct current voltage which is maintained at higher voltage and has smaller fluctuation, ensures the working requirements of the LED light-emitting circuit and the parallel type voltage stabilizing circuit, and ensures that the voltage of the output end of the circuit cannot influence the voltage change of the input end by utilizing the unidirectional conduction of the first diode.
The parallel voltage stabilizing circuit comprises a third resistor, a second capacitor and a second diode, wherein the second capacitor is an electrolytic capacitor, the second diode is a voltage stabilizing diode, one end of the third resistor is an input end of the parallel voltage stabilizing circuit, the other end of the third resistor, the negative electrode of the second diode and the positive electrode of the second capacitor are connected and the connecting end of the second diode and the positive electrode of the second capacitor are output ends of the parallel voltage stabilizing circuit, and the positive electrode of the second diode and the negative electrode of the second capacitor are connected and the connecting end of the second diode and the negative electrode of the second capacitor are grounding ends of the parallel voltage stabilizing circuit. The circuit takes the second diode as a basic voltage stabilizing element, realizes the voltage stabilizing function with the lowest cost, and provides working voltage for the linear constant current circuit and the light sensing circuit.
The light sensing circuit comprises a fourth resistor and a phototriode, one end of the fourth resistor is the input end of the light sensing circuit, the other end of the fourth resistor is connected with the collector electrode of the phototriode, the connecting end is the output end of the light sensing circuit, and the emitter of the phototriode is the grounding end of the light sensing circuit. The circuit detects illumination intensity through the photosensitive transistor, the illumination threshold value is set through the fourth resistor, when the illumination intensity detected by the photosensitive transistor is smaller than the illumination threshold value, the output end of the light sensing circuit has current output, and when the illumination intensity is not smaller than the illumination threshold value, the output end of the light sensing circuit has no current output, so that the light sensing function is realized by adopting lower cost.
The state holding circuit comprises a third diode, a third capacitor and a fifth resistor, wherein the third capacitor is a common capacitor, the third diode is a rectifier diode, the positive electrode of the third diode is an input end of the state holding circuit, the negative electrode of the third diode, one end of the third capacitor and one end of the fifth resistor are connected, the connecting end of the third capacitor and one end of the fifth resistor are output ends of the state holding circuit, the other end of the third capacitor and the other end of the fifth resistor are connected, and the connecting end of the third capacitor and the other end of the fifth resistor are grounded ends of the state holding circuit. In the circuit, when the illumination intensity is smaller than the illumination threshold value in the photoinduction circuit, the current output by the photoinduction circuit charges the state holding circuit, so that the output voltage of the output end of the state holding circuit is increased, and even when the photoinduction circuit does not output current in a certain time, the output end of the state holding circuit is kept at a higher voltage, and when the photoinduction circuit does not output current in a longer time, the voltage of the output end of the state holding circuit is slowly reduced until the voltage approaches zero, the state holding circuit is matched with the photoinduction circuit, the requirement on the leakage current index of an electronic component used for realizing a circuit structure is lower, and the temperature resistance is better.
The linear constant current circuit comprises a constant current chip with the model of SM2083, a sixth resistor, a seventh resistor, a fourth diode, a fifth diode and an NMOS tube, wherein the fourth diode and the fifth diode are voltage-stabilizing diodes, the 1 st pin of the constant current chip is the input end of the linear constant current circuit, the 8 th pin of the constant current chip is the output end of the linear constant current circuit, the 4 th pin of the constant current chip, the negative electrode of the fourth diode, the positive electrode of the fifth diode and one end of the sixth resistor are connected, the negative electrode of the fifth diode is the first control end of the linear constant current circuit, the 5 th pin of the constant current chip is connected with one end of the seventh resistor, the other end of the seventh resistor is connected with the drain electrode of the NMOS tube, the gate of the NMOS tube is the second control end of the linear constant current circuit, and the other end of the fourth resistor, the positive electrode of the fourth diode and the constant current end of the NMOS tube are connected with the ground. In the linear constant current circuit, through the matching of the sixth resistor, the seventh resistor, the fourth diode, the fifth diode and the NMOS tube with the chip SM2083, the circuit structure of the linear constant current circuit, which is only one control port, is expanded to two control ports, each control port of the linear constant current circuit is determined to have corresponding threshold voltage, when the voltage of the first control port is higher than the threshold voltage of the first control port, the first control port is connected with a switching-on level signal, when the voltage of the first control port is not higher than the voltage threshold value of the first control port, the first control port is connected with a switching-off level signal, and similarly, when the voltage of the second control port is not higher than the voltage threshold value of the second control port, the second control port is connected with a switching-on level signal, when the first control port and the second control port are both connected with the switching-on level signal, the output ends of the linear constant current circuit are related to current output, when at least one of the first control port and the second control port is connected with the switching-on level signal, and the linear constant current circuit is simple in structure and has no current output.
The alternating current-to-direct current circuit comprises a full-bridge rectifier bridge, a 1 st pin of the full-bridge rectifier bridge is a live wire input end of the alternating current-to-direct current circuit, a 3 rd pin of the full-bridge rectifier bridge is a zero line input end of the alternating current-to-direct current circuit, a 2 nd pin of the full-bridge rectifier bridge is an output end of the alternating current-to-direct current circuit, and a 4 th pin of the full-bridge rectifier bridge is a grounding end of the alternating current-to-direct current circuit.
Compared with the prior art, the invention has the advantages that the parallel type voltage stabilizing circuit is adopted to replace the serial type voltage stabilizing circuit, the state holding circuit is adopted to replace the singlechip control circuit, the voltage smoothing circuit and the resistance voltage dividing circuit are added, the voltage stabilizing diode used as a core voltage stabilizing element for the parallel type voltage stabilizing circuit is used for always maintaining the voltage higher than the voltage of the LED light-emitting circuit, and then the serial type voltage stabilizing circuit for stabilizing the integrated circuit is used for stabilizing the voltage.
Drawings
FIG. 1 is a block diagram of a conventional linear constant current LED circuit with light sensing function;
FIG. 2 is a block diagram of a linear constant current LED circuit with light sensing function according to the present invention;
FIG. 3 is a schematic circuit diagram of a linear constant current LED circuit with light sensing function according to the present invention;
FIG. 4 is a waveform diagram of the output voltage of the AC-DC circuit of the present invention;
fig. 5 is a voltage waveform diagram of the output terminal of the voltage smoothing circuit of the present invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
Embodiment one: as shown in FIG. 2, the linear constant current LED circuit with the light sensing function comprises an LED light emitting circuit, an alternating current-to-direct current circuit, a linear constant current circuit and a light sensing circuit, wherein the LED light emitting circuit is provided with a positive input end and a negative input end, the alternating current-to-direct current circuit is provided with a live wire input end, a zero wire input end, an output end and a grounding end, the light sensing circuit is provided with an input end, an output end and a grounding end, the live wire input end of the alternating current-to-direct current circuit is used for connecting with a live wire of a commercial power, the zero wire input end is used for connecting with a zero wire of the commercial power, the linear constant current circuit is provided with an input end, a first control end, a second control end, an output end and a grounding end, the negative input end of the LED light emitting circuit is connected with the output end of the linear constant current circuit, the linear constant current LED circuit further comprises a parallel type voltage stabilizing circuit, a state maintaining circuit, a voltage smoothing circuit and a resistor voltage dividing circuit, and a parallel type voltage stabilizing circuit are provided with an input end, an output end and a grounding end, the state holding circuit, the voltage smoothing circuit and the resistor voltage dividing circuit are respectively provided with an input end, an output end and a grounding end, the output end of the alternating current-to-direct current circuit, the input end of the voltage smoothing circuit and the input end of the resistor voltage dividing circuit are connected, the output end of the voltage smoothing circuit, the positive input end of the LED light-emitting circuit and the input end of the parallel voltage stabilizing circuit are connected, the output end of the parallel voltage stabilizing circuit, the input end of the linear constant current circuit and the input end of the photoinduction circuit are connected, the output end of the photoinduction circuit is connected with the input end of the state holding circuit, the output end of the state holding circuit is connected with the second control end of the linear constant current circuit, the output end of the resistor voltage dividing circuit is connected with the first control end of the linear constant current circuit, the grounding end of the alternating current-to-direct current circuit, the grounding end of the parallel voltage stabilizing circuit and the grounding end of the state holding circuit, the grounding end of the light sensing circuit, the grounding end of the linear constant current circuit, the grounding end of the voltage smoothing circuit and the grounding end of the resistor divider circuit are connected.
The working principle of the linear constant current LED circuit with the light sensing function of the embodiment is as follows: the AC-DC circuit converts sine wave AC voltage of externally connected commercial power into high-voltage DC voltage with great voltage fluctuation, and the high-voltage DC voltage is in a steamed bread waveform, and the waveform chart is shown in figure 4. The voltage smoothing circuit converts the high-voltage direct-current voltage of the steamed bread waveform input into the voltage smoothing circuit into a relatively flat high-voltage direct-current voltage, the waveform of the high-voltage direct-current voltage is shown in fig. 5, and the high-voltage direct-current voltage is always larger than the voltage of the LED light-emitting circuit, so that the working voltage is provided for the LED light-emitting circuit. The parallel voltage stabilizing circuit converts the high-voltage direct-current voltage output by the voltage smoothing circuit into a low-voltage constant-voltage power supply and provides working voltage for the linear constant-current circuit and the light sensing circuit. The resistor voltage dividing circuit is used for reducing the high-voltage direct-current voltage of the steamed bread waveform input into the resistor voltage dividing circuit to obtain low-voltage output, the low-voltage is also the steamed bread waveform, when the light sensing circuit has higher voltage and lower voltage, the light sensing circuit has current output at the output end when the light intensity is smaller, and the state holding circuit is used for converting the current signal output by the light sensing circuit into a higher-voltage signal to be output at the output end and holding the higher-voltage signal for a period of time; when the illumination intensity is strong, the output end of the light sensing circuit does not have current output, then the output voltage of the output end of the state holding circuit is changed into lower voltage slowly, when the voltage connected to the first control end is higher than the threshold voltage of the first control end, the first control end is connected with a switching-on level signal, when the voltage connected to the first control end is not higher than the voltage threshold of the first control end, the first control end is connected with a switching-off level signal, when the voltage connected to the second control end is higher than the voltage threshold of the second control end, the second control end is connected with a switching-on level signal, when the voltage connected to the second control end is not higher than the voltage threshold of the second control end, the output end of the linear constant current circuit has current output, and the LED light emitting circuit emits light at the moment, when at least one of the first control end and the second control end is connected with a power-off signal, the output end of the linear constant current circuit does not emit light, the LED light-emitting circuit does not emit light, as the switching level signal of the first control end of the linear constant current circuit changes quickly, the change of light emission and non-light emission is not seen by eyes, and the switching level signal of the second control end of the linear constant current circuit changes slowly, so as long as the voltage of the second control end of the linear constant current circuit is an on-level signal, the LED light-emitting circuit displays light emission, otherwise, if the voltage of the second control end of the linear constant current circuit is an off-level signal, the LED light-emitting circuit displays no light, at the moment when the LED light-emitting circuit does not emit light, the moment when the light intensity detected by the light-sensing circuit is lower than the light threshold value in the light-sensing circuit, and the voltage of the second control end of the linear constant current circuit is of an on-level type, if the light sensing circuit can not detect that the illumination intensity is lower than the illumination threshold value in the light sensing circuit, the voltage at the second control end is an off-level signal, so that the LED light-emitting circuit emits light when the light sensing circuit detects the illumination intensity lower than the illumination threshold value in the light sensing circuit, and the LED light-emitting circuit can not emit light when the light sensing circuit can not detect the illumination intensity lower than the illumination threshold value in the light sensing circuit. Therefore, the light sensing circuit, the resistor voltage dividing circuit and the linear constant current circuit are matched to realize the control of the LED light emitting circuit.
Embodiment two: as shown in fig. 2 and 3, a linear constant current LED circuit with a light sensing function includes an LED light emitting circuit, an ac-to-dc circuit, a linear constant current circuit and a light sensing circuit, the LED light emitting circuit has a positive input end and a negative input end, the ac-to-dc circuit has a live wire input end, a neutral wire input end, an output end and a ground end, the light sensing circuit has an input end, an output end and a ground end, the live wire input end of the ac-to-dc circuit is used for connecting with a live wire of a utility power, the neutral wire input end is used for connecting with a neutral wire of the utility power, the linear constant current circuit has an input end, a first control end, a second control end, an output end and a ground end, the negative input end of the LED light emitting circuit is connected with the output end of the linear constant current circuit, the linear constant current LED circuit further includes a parallel voltage stabilizing circuit, a state holding circuit, a voltage smoothing circuit and a resistor voltage dividing circuit, the parallel voltage stabilizing circuit is provided with an input end, an output end and a grounding end, the state holding circuit, the voltage smoothing circuit and the resistor voltage dividing circuit are respectively provided with the input end, the output end and the grounding end, the output end of the alternating current-to-direct current circuit, the input end of the voltage smoothing circuit and the input end of the resistor voltage dividing circuit are connected, the output end of the voltage smoothing circuit, the positive input end of the LED light-emitting circuit and the input end of the parallel voltage stabilizing circuit are connected, the output end of the parallel voltage stabilizing circuit, the input end of the linear constant current circuit and the input end of the photo-sensing circuit are connected, the output end of the photo-sensing circuit is connected with the input end of the state holding circuit, the output end of the state holding circuit is connected with the second control end of the linear constant current circuit, the output end of the resistor voltage dividing circuit is connected with the first control end of the linear constant current circuit, the grounding end of the alternating current-to-direct current circuit, the grounding end of the parallel voltage stabilizing circuit, the grounding end of the state holding circuit, the grounding end of the light sensing circuit, the grounding end of the linear constant current circuit, the grounding end of the voltage smoothing circuit and the grounding end of the resistor divider circuit are connected.
In this embodiment, the resistor voltage divider circuit includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is an input end of the resistor voltage divider circuit, the other end of the first resistor R1 is connected with one end of the second resistor R2, the connection end of the first resistor R1 is an output end of the resistor voltage divider circuit, and the other end of the second resistor R2 is a ground end of the resistor voltage divider circuit.
In this embodiment, the voltage smoothing circuit includes a first capacitor C1 and a first diode D1, where the first diode D1 is a rectifying diode, the first capacitor C1 is an electrolytic capacitor, the anode of the first diode D1 is an input end of the voltage smoothing circuit, the cathode of the first diode D1 is connected with the anode of the first capacitor C1, and the connection end of the anode of the first diode D1 is an output end of the voltage smoothing circuit, and the cathode of the first capacitor C1 is a ground end of the voltage smoothing circuit.
In this embodiment, the parallel voltage stabilizing circuit includes a third resistor R3, a second capacitor C2 and a second diode D2, where the second capacitor C2 is an electrolytic capacitor, the second diode D2 is a voltage stabilizing diode, one end of the third resistor R3 is an input end of the parallel voltage stabilizing circuit, the other end of the third resistor R3, a negative electrode of the second diode D2 and an anode of the second capacitor C2 are connected and their connection ends are output ends of the parallel voltage stabilizing circuit, and an anode of the second diode D2 and a negative electrode of the second capacitor C2 are connected and their connection ends are ground ends of the parallel voltage stabilizing circuit.
In this embodiment, the photo-sensing circuit includes a fourth resistor R4 and a phototransistor Q1, one end of the fourth resistor R4 is an input end of the photo-sensing circuit, the other end of the fourth resistor R4 is connected with a collector of the phototransistor Q1 and the connection end is an output end of the photo-sensing circuit, and an emitter of the phototransistor Q1 is a ground end of the photo-sensing circuit.
In this embodiment, the state holding circuit includes a third diode D3, a third capacitor C3 and a fifth resistor R5, the third capacitor C3 is a common capacitor, the third diode D3 is a rectifying diode, the positive electrode of the third diode D3 is an input end of the state holding circuit, the negative electrode of the third diode D3, one end of the third capacitor C3 and one end of the fifth resistor R5 are connected and their connection ends are output ends of the state holding circuit, and the other end of the third capacitor C3 and the other end of the fifth resistor R5 are connected and their connection ends are ground ends of the state holding circuit.
In this embodiment, the linear constant current circuit includes a constant current chip U1 with a model of SM2083, a sixth resistor R6, a seventh resistor R7, a fourth diode D4, a fifth diode D5, and an NMOS transistor M1, where the fourth diode D4 and the fifth diode D5 are all voltage-stabilizing diodes, the 1 st pin of the constant current chip U1 is an input end of the linear constant current circuit, the 8 th pin of the constant current chip U1 is an output end of the linear constant current circuit, the 4 th pin of the constant current chip U1, the negative electrode of the fourth diode D4, the positive electrode of the fifth diode D5, and one end of the sixth resistor R6 are connected, the negative electrode of the fifth diode D5 is a first control end of the linear constant current circuit, the 5 th pin of the constant current chip U1 is connected with one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected with the drain electrode of the NMOS transistor M1, the gate of the NMOS transistor M1 is a second control end of the linear constant current circuit, and the other end of the sixth resistor R6, the positive electrode of the fourth diode D4, the positive electrode of the NMOS transistor M1 and the source of the NMOS transistor M1 are connected with the linear constant current circuit.
In this embodiment, the ac-dc conversion circuit includes a full-bridge rectifier bridge, the 1 st leg of the full-bridge rectifier bridge is the live wire input end of the ac-dc conversion circuit, the 3 rd leg of the full-bridge rectifier bridge is the zero line input end of the ac-dc conversion circuit, the 2 nd leg of the full-bridge rectifier bridge is the output end of the ac-dc conversion circuit, and the 4 th leg of the full-bridge rectifier bridge is the ground end of the ac-dc conversion circuit.
In this embodiment, the LED light-emitting circuit is formed by serially connecting N light-emitting diodes (N1-Nn), where N is an integer greater than or equal to 1.
Claims (8)
1. The linear constant current LED circuit with the light sensing function comprises an LED light-emitting circuit, an alternating current-to-direct current circuit, a linear constant current circuit and a light sensing circuit, wherein the LED light-emitting circuit is provided with a positive input end and a negative input end, the alternating current-to-direct current circuit is provided with a live wire input end, a zero line input end, an output end and a grounding end, the light sensing circuit is provided with an input end, an output end and a grounding end, the live wire input end of the alternating current-to-direct current circuit is used for connecting a live wire of a mains supply, the zero line input end is used for connecting a zero line of the mains supply, the linear constant current circuit is provided with an input end, a first control end, a second control end, an output end and a grounding end, the negative input end of the LED light-emitting circuit is connected with the output end of the linear constant current circuit, the linear constant current LED circuit is further provided with a parallel voltage stabilizing circuit, a state holding circuit, a voltage smoothing circuit and a resistor voltage dividing circuit, the parallel voltage stabilizing circuit is provided with an input end, an output end and a grounding end, the state holding circuit is connected with the voltage dividing circuit, the voltage stabilizing circuit is connected with the input end of the voltage dividing circuit, the voltage stabilizing circuit is connected with the voltage dividing circuit, the output end of the state holding circuit is connected with the second control end of the linear constant current circuit, the output end of the resistor voltage dividing circuit is connected with the first control end of the linear constant current circuit, and the grounding end of the alternating current-to-direct current circuit, the grounding end of the parallel voltage stabilizing circuit, the grounding end of the state holding circuit, the grounding end of the light sensing circuit, the grounding end of the linear constant current circuit, the grounding end of the voltage smoothing circuit and the grounding end of the resistor voltage dividing circuit are connected.
2. The linear constant current LED circuit with the light sensing function according to claim 1, wherein the resistor voltage dividing circuit comprises a first resistor and a second resistor, one end of the first resistor is an input end of the resistor voltage dividing circuit, the other end of the first resistor is connected with one end of the second resistor, the connecting end of the first resistor is an output end of the resistor voltage dividing circuit, and the other end of the second resistor is a grounding end of the resistor voltage dividing circuit.
3. The linear constant current LED circuit with the light sensing function according to claim 1, wherein the voltage smoothing circuit comprises a first capacitor and a first diode, the first diode is a rectifier diode, the first capacitor is an electrolytic capacitor, the positive electrode of the first diode is an input end of the voltage smoothing circuit, the negative electrode of the first diode is connected with the positive electrode of the first capacitor, the connection end of the positive electrode of the first diode is an output end of the voltage smoothing circuit, and the negative electrode of the first capacitor is a grounding end of the voltage smoothing circuit.
4. The linear constant current LED circuit with the light sensing function according to claim 1, wherein the parallel voltage stabilizing circuit comprises a third resistor, a second capacitor and a second diode, wherein the second capacitor is an electrolytic capacitor, the second diode is a voltage stabilizing diode, one end of the third resistor is an input end of the parallel voltage stabilizing circuit, the other end of the third resistor, the negative electrode of the second diode and the positive electrode of the second capacitor are connected, the connecting end of the third resistor is an output end of the parallel voltage stabilizing circuit, and the positive electrode of the second diode and the negative electrode of the second capacitor are connected, and the connecting end of the second diode is a grounding end of the parallel voltage stabilizing circuit.
5. The linear constant current LED circuit with the light sensing function according to claim 1, wherein the light sensing circuit comprises a fourth resistor and a phototriode, one end of the fourth resistor is an input end of the light sensing circuit, the other end of the fourth resistor is connected with a collector electrode of the phototriode, the connecting end is an output end of the light sensing circuit, and an emission end of the phototriode is a grounding end of the light sensing circuit.
6. The linear constant current LED circuit with the light sensing function according to claim 1, wherein the state holding circuit comprises a third diode, a third capacitor and a fifth resistor, the third capacitor is a common capacitor, the third diode is a rectifying diode, the positive electrode of the third diode is an input end of the state holding circuit, the negative electrode of the third diode, one end of the third capacitor and one end of the fifth resistor are connected, the connecting end of the third diode is an output end of the state holding circuit, the other end of the third capacitor and the other end of the fifth resistor are connected, and the connecting end of the third capacitor is a grounding end of the state holding circuit.
7. The linear constant current LED circuit with the light sensing function according to claim 1, wherein the linear constant current circuit comprises a constant current chip with the model of SM2083, a sixth resistor, a seventh resistor, a fourth diode, a fifth diode and an NMOS tube, wherein the fourth diode and the fifth diode are both voltage stabilizing diodes, the 1 st pin of the constant current chip is an input end of the linear constant current circuit, the 8 th pin of the constant current chip is an output end of the linear constant current circuit, the 4 th pin of the constant current chip, the negative electrode of the fourth diode, the positive electrode of the fifth diode and one end of the sixth resistor are connected, the negative electrode of the fifth diode is a first control end of the linear constant current circuit, the 5 th pin of the constant current chip and one end of the seventh resistor are connected, the other end of the seventh resistor and the drain electrode of the NMOS tube are connected, the 4 th pin of the constant current chip, the negative electrode of the fourth diode and the positive electrode of the fourth diode are connected, and the positive electrode of the linear constant current circuit is connected.
8. The linear constant current LED circuit with a light sensing function according to claim 1, wherein the alternating current-to-direct current circuit comprises a full bridge rectifier bridge, a 1 st pin of the full bridge rectifier bridge is a live wire input end of the alternating current-to-direct current circuit, a 3 rd pin of the full bridge rectifier bridge is a zero line input end of the alternating current-to-direct current circuit, a 2 nd pin of the full bridge rectifier bridge is an output end of the alternating current-to-direct current circuit, and a 4 th pin of the full bridge rectifier bridge is a grounding end of the alternating current-to-direct current circuit.
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| CN110248441B (en) * | 2019-05-22 | 2021-04-20 | 鹰潭阳光照明有限公司 | Intelligent light-operated linear LED lamp circuit |
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