CN113573437A - Intelligent street lamp system based on sound, light, pressure and infrared sensing-single chip microcomputer control-silicon controlled rectifier dimming - Google Patents
Intelligent street lamp system based on sound, light, pressure and infrared sensing-single chip microcomputer control-silicon controlled rectifier dimming Download PDFInfo
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- H—ELECTRICITY
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- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
- H05B45/12—Controlling the intensity of the light using optical feedback
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
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- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
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- H05B47/105—Controlling the light source in response to determined parameters
- H05B47/115—Controlling the light source in response to determined parameters by determining the presence or movement of objects or living beings
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- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]
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Abstract
The invention discloses an intelligent street lamp system based on sound, light, pressure and infrared sensing, single chip microcomputer control and silicon controlled rectifier dimming, and belongs to the field of urban road planning. The intelligent street lamp system comprises a sensor, a single chip microcomputer and a silicon controlled rectifier dimming circuit, wherein the sensor, the single chip microcomputer and the silicon controlled rectifier dimming circuit are sequentially connected. The invention provides an intelligent street lamp system based on sound, light, pressure and infrared sensing, single chip microcomputer control and silicon controlled rectifier dimming. The invention has the advantages of intelligence, low cost, wide application range, minimum electricity saving of not less than 10.64 percent, strong adjustability and capability of being further improved according to different requirements of different road sections.
Description
Technical Field
The invention relates to an intelligent street lamp system based on sound, light, pressure and infrared sensing, single chip microcomputer control and silicon controlled rectifier dimming, and belongs to the field of urban road planning.
Background
The scheme of controlling electricity by turning off the lamp at different times has been applied in foreign countries for a short time, but the scheme causes the reduction of productivity and office efficiency and the great rise of public security and road traffic accidents, and is abandoned in a piece of objection in less than one year.
At present, the research on adjusting the street lamp illumination and further achieving the energy-saving effect in China only stays at the control stage of the photoswitch, that is, the illumination intensity is used as a signal to control the switch of the street lamp or adjust the light intensity of the street lamp, and the problem of lighting waste of the street lamp at night can not be solved obviously, for example, the power-saving scheme of macroscopically adjusting the street lamp voltage can cause the voltage at the tail end of a line to be too low, so that the street lamp is suddenly extinguished or even burnt.
Disclosure of Invention
The invention aims to solve the problems that the existing street lamp regulation and control system is not intelligent enough and cannot save energy, and discloses an intelligent street lamp system based on sound, light, pressure and infrared sensing, single chip microcomputer control and silicon controlled rectifier dimming.
A smart street lamp system based on sound, light, pressure and infrared sensing, single chip microcomputer control and silicon controlled rectifier dimming comprises a sensor, a single chip microcomputer and a silicon controlled rectifier dimming circuit, wherein the sensor, the single chip microcomputer and the silicon controlled rectifier dimming circuit are sequentially connected.
Further, in the above-mentioned case,
the sensor is used for sensing the passing of people or vehicles and further generating an electric signal to be sent to the single chip microcomputer;
the singlechip is used for capturing the electric signal of the sensor so as to control the silicon controlled rectifier dimming circuit;
and the silicon controlled rectifier dimming circuit is used for adjusting the on-off and illumination of the street lamp under the control of the singlechip.
Further, the sensors include force sensitive resistors, photo-sensitive resistors, acoustic sensitive resistors, and infrared sensors, wherein,
the force sensitive resistor is used for sensing whether a person or a vehicle treads on the road surface;
the photoresistor is used for sensing the illumination of the current road section;
the acoustic sensitive resistor is used for sensing the loudness of the current road section;
and the infrared sensor is used for sensing whether a person or a vehicle passes through the current road section.
Furthermore, the force-sensitive resistors are laid at the road junction and the road tail.
Furthermore, as for the single chip microcomputer,
when the photosensitive resistor senses that the illumination is enough, the singlechip cannot receive electric signals from the force sensitive resistor, the acoustic sensitive resistor and the infrared sensor, namely, the silicon controlled rectifier dimming circuit cannot be started;
when the force-sensitive resistor does not sense that a vehicle passes by, the force-sensitive resistor is in a standby state, and the singlechip controls the silicon controlled rectifier dimming circuit to maintain the street lamp at low illumination; when the force-sensitive resistor senses that a vehicle passes by, the singlechip controls the silicon controlled rectifier dimming circuit to adjust the street lamp to high illumination;
the sound-sensitive resistor is used as a supplement of the force-sensitive resistor, when the sound-sensitive resistor does not sense that a vehicle passes by, the sound-sensitive resistor is in a standby state, and the singlechip controls the silicon controlled rectifier dimming circuit to maintain the street lamp at low illumination; when the sound-sensitive resistor senses that a vehicle passes by, the singlechip controls the silicon controlled rectifier dimming circuit to adjust the street lamp to high illumination.
Further, the singlechip is provided with high-illumination opening time, and if the sensor does not generate a new electric signal during the period of maintaining the high illumination of the street lamp, the singlechip adjusts the street lamp to the low illumination by controlling the silicon controlled rectifier dimming circuit after the street lamp maintains the high illumination to the preset high-illumination opening time.
Furthermore, when the single chip microcomputer receives the electric signal from the force-sensitive resistor in the sidewalk, the time for controlling the street lamp to maintain high illumination is longer than the time for receiving the electric signal from the force-sensitive resistor in the motor vehicle lane.
Further, the thyristor dimming circuit comprises a diode D1, a diode D2, a diode D3, a diode D4, a dimming resistor R5, a dimming resistor R6, a single-pole double-throw switch SW1, a resistor R2, a resistor R3, an electrolytic capacitor C1, a light emitting diode D5 and a thyristor, wherein,
the diode D1 and the diode D3 are connected in series to form a bridge arm, the diode D2 and the diode D4 are connected in series to form a bridge arm, the two bridge arms are connected in parallel, one end of the dimming resistor R5 and one end of the dimming resistor R6 are respectively connected with two output ends of the single-pole double-throw switch SW1, the input end of the single-pole double-throw switch SW1 is simultaneously connected with the anode of the electrolytic capacitor C1 and one end of the resistor R2, the other end of the resistor R2 is simultaneously connected with one end of the resistor R3 and the control electrode G of the thyristor, the other ends of the dimming resistor R5 and the dimming resistor R6 and the cathodes of the diode D1 and the diode D2 are both connected with the anode of the light emitting diode D5, the cathode of the light emitting diode D5 is connected with the pin A of the thyristor, the K pin of the thyristor, the other end of the resistor R3 and the cathode of the electrolytic capacitor C1 are both connected with the anodes of the diode D3 and the anodes of the diode D4, and the two bridge arms are respectively connected with the two ends of the alternating current power supply.
The invention has the following advantages: the invention provides an intelligent street lamp system based on sound, light, pressure and infrared sensing, single chip microcomputer control and silicon controlled rectifier dimming. The invention has the advantages of intelligence, low cost, wide application range, minimum power saving of not less than 10.64 percent (the power saving can be greatly increased according to actual application scenes), strong adjustability and capability of further improving according to different requirements of different road sections.
Drawings
FIG. 1 is a thyristor dimmer circuit according to the present invention;
fig. 2 is a model object diagram of an intelligent street lamp system based on sound, light, pressure and infrared sensing, single chip microcomputer control and silicon controlled rectifier dimming.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the intelligent street lamp system based on sound, light, pressure and infrared sensing, single chip microcomputer control and silicon controlled rectifier dimming comprises a sensor, a single chip microcomputer and a silicon controlled rectifier dimming circuit, wherein the sensor, the single chip microcomputer and the silicon controlled rectifier dimming circuit are connected in sequence.
Specifically, the invention provides a novel street lamp control system which takes a force-sensitive resistor as a measuring element, a single chip microcomputer as a controller, a silicon controlled light dimming circuit as an execution element and actual street lamp illumination as a controlled object, and takes the defect of the existing control means as an entry point from the idea of saving energy by adjusting street lamp illumination through voltage reduction, voltage stabilization and light dimming. In the embodiment, the system is divided into three parts, namely a force-sensitive resistor laid at an entrance of a road end or in each deceleration strip, a singlechip arranged at a distribution box of a road section, a silicon controlled control system and a street lamp.
When the system works, the street lamps are in a low-illumination state (in consideration of traffic safety and public security, the street lamps cannot be completely closed, the low-illumination state is in accordance with the national standard, for example, as specified in urban road lighting design standard CJJ45-2015 1, the average illumination maintenance value of a motor vehicle lane with small flow rate at night can be reduced to below 0.5Lux from 0.7Lux, for a sidewalk, the average illumination maintenance value of a residential area can be reduced to 1Lux from 3Lux at most when the flow rate at night is reduced), and when the force sensitive resistor is pressed, the singlechip controls the silicon controlled circuit to complete gear shifting, so that the street lamps are adjusted to be high in illumination.
It should be noted that the system is not active all night long-even on a three-quarter highway, there is much traffic and traffic flow in the first half night. Therefore, the system should be started when the illuminance is reduced at dusk in the previous day, but is in a state of 'starting but not starting' in the previous midnight, and the illuminance of the street lamp is normal; in the late midnight, the system is activated and the force sensitive resistor part starts to work by current, and the system is normally closed by the next morning.
The switch of the morning system is controlled by a longitude and latitude switch in the actual street lamp, so the design of the project in the aspect is not needed. In order to realize the diversification of control means, the project group adopts acoustic-sensitive and photosensitive sensors to enrich the functions besides the main means of force-sensitive control.
Further, in the above-mentioned case,
the sensor is used for sensing the passing of people or vehicles and further generating an electric signal to be sent to the single chip microcomputer;
the singlechip is used for capturing the electric signal of the sensor so as to control the silicon controlled rectifier dimming circuit;
and the silicon controlled rectifier dimming circuit is used for adjusting the on-off and illumination of the street lamp under the control of the singlechip.
Specifically, as shown in fig. 1, a Silicon Controlled Rectifier (SCR) is a high-power electrical component, has a small volume and a low price, but can achieve tens of thousands of times or even hundreds of thousands of times of power amplification, and can react quickly, and can achieve microsecond-level turn-on and turn-off, so that the requirements of practical application of a street lamp circuit can be well met.
The thyristor has three pins-anode A, cathode B and control electrode G. When the control electrode G reaches the positive trigger voltage, the controlled silicon is conducted, and the working state is similar to a triode at the moment; when the anode current between AK is lower than the maintaining current, the controllable silicon is turned off, which is equivalent to a non-contact switch. Based on this characteristic of the thyristors, the project group design circuit is shown.
The controllable silicon is turned on and off, and the corresponding street lamp is turned on and off. The whole dimming process is carried out in a very short time, the silicon controlled switch is switched off, the street lamp is on or off, and the rapid change process cannot be sensed due to the vision residue of human eyes, so that the street lamp illumination at the two gear currents is different.
As shown in the model object diagram of fig. 2, the used bulb is an LED lamp with a wide application scene, and the bulb needs to pass through direct current, so that a rectifying circuit is connected to a power outlet to rectify alternating current into pulsating direct current, and a one-way thyristor is correspondingly selected; because the pulse direct current passes through the circuit instead of the constant current, the capacitor part does not act as an open circuit and plays the role of charging and discharging, namely the capacitor is continuously charged, the voltage of a control electrode G gradually rises, when the voltage rises to a positive trigger voltage, the silicon controlled rectifier is conducted, the electric field stored by the capacitor can be discharged, and a new charging process is started; the current in the circuit has the same variation trend as the voltage, and the controllable silicon is turned off after the current is attenuated to be below the maintaining current.
When the circuit works in two different gears, the voltage and the current at two ends of the street lamp approximately change in trend like a graph. It can be seen from the figure that it is the difference between the time from turning on to turning off and the time from turning off to turning on of the street lamp in different gears, which provides the possibility for dimming.
Further, the sensors include force sensitive resistors, photo-sensitive resistors, acoustic sensitive resistors, and infrared sensors, wherein,
the force sensitive resistor is used for sensing whether a person or a vehicle treads on the road surface;
the photoresistor is used for sensing the illumination of the current road section;
the acoustic sensitive resistor is used for sensing the loudness of the current road section;
and the infrared sensor is used for sensing whether a person or a vehicle passes through the current road section.
Furthermore, the force-sensitive resistors are laid at the road junction and the road tail.
Furthermore, as for the single chip microcomputer,
when the photosensitive resistor senses that the illumination is enough, the singlechip cannot receive electric signals from the force sensitive resistor, the acoustic sensitive resistor and the infrared sensor, namely, the silicon controlled rectifier dimming circuit cannot be started;
when the force-sensitive resistor does not sense that a vehicle passes by, the force-sensitive resistor is in a standby state, and the singlechip controls the silicon controlled rectifier dimming circuit to maintain the street lamp at low illumination; when the force-sensitive resistor senses that a vehicle passes by, the singlechip controls the silicon controlled rectifier dimming circuit to adjust the street lamp to high illumination;
the sound-sensitive resistor is used as a supplement of the force-sensitive resistor, when the sound-sensitive resistor does not sense that a vehicle passes by, the sound-sensitive resistor is in a standby state, and the singlechip controls the silicon controlled rectifier dimming circuit to maintain the street lamp at low illumination; when the sound-sensitive resistor senses that a vehicle passes by, the singlechip controls the silicon controlled rectifier dimming circuit to adjust the street lamp to high illumination.
Further, the singlechip is provided with high-illumination opening time, and if the sensor does not generate a new electric signal during the period of maintaining the high illumination of the street lamp, the singlechip adjusts the street lamp to the low illumination by controlling the silicon controlled rectifier dimming circuit after the street lamp maintains the high illumination to the preset high-illumination opening time.
Furthermore, when the single chip microcomputer receives the electric signal from the force-sensitive resistor in the sidewalk, the time for controlling the street lamp to maintain high illumination is longer than the time for receiving the electric signal from the force-sensitive resistor in the motor vehicle lane.
Specifically, the single chip microcomputer of the embodiment adopts an open-source single chip microcomputer Arduino which is mature and reliable in function and relatively low in cost to meet the requirement of a main control part. The functions and the implementation means of the singlechip are as follows:
the photoresistor controls a system switch: in the invention, the function is realized by the photoresistor, namely, when the illumination received by the photoresistor is enough, the whole circuit system cannot be started; after the photoresistor is covered, the circuit is turned on.
The force sensitive resistor controls the illumination of the street lamp: the force-sensitive resistor is connected with the single chip microcomputer part, and the port of the single chip microcomputer monitors the voltage change of the two ends of the resistor so as to judge the stress condition of the resistor. When no vehicle passes at night, the force-sensitive resistor is in a standby state, and the Flag function is set to be 0 and correspondingly to be low level and low illumination; when a vehicle passes by, the force-sensitive resistor is stressed, the Flag function is updated from 0 to 1, a voltage/current signal source is output, the signal source biases a gear through the electromagnetic relay module, and the circuit is adjusted to a high level and high illumination.
The function delay controls the starting time of the system, considering that a vehicle can directly stop after driving, a proper starting time can be given first, and the street lamp is prevented from being continuously lighted; under normal conditions, the vehicle can directly run out without being opened for too long, so that the control system can be immediately turned off after the other force sensitive resistor at the road exit is pressed, and closed-loop control is formed.
The acoustic sensitive resistor controls the illumination of the street lamp: the sound sensitive resistor is used as a supplement of a force sensitive control means, and has the same function as the force sensitive resistor. When enough loudness is received, the street lamp system works, and the illumination is adjusted from a low gear to a high gear. In the model, the method can be used for rich sensing, and in practical application, due to the fact that voice control is prone to interference, street lamps or the lamps are frequently switched on and off, sensing of specific frequency bands (such as human voice and vehicle whistle) is attempted in the next step.
The time of different pressure switches is different: the force-sensitive resistors in the model are respectively paved on a motor vehicle lane and a pedestrian lane, and different illumination time lengths are set in consideration of different traveling speeds of a person and a vehicle.
Voltage control zebra crossing department warning light: because the pedestrian is few in the night, the speed of a motor vehicle is very fast basically, and we can set up the warning light in zebra crossing department, and then remind pedestrian the place ahead to have the car to pass through this system to avoid taking place unnecessary danger. When the vehicle passes through the intersection, the force signal is transmitted to the single chip microcomputer, the single chip microcomputer outputs a signal to enable the prompting lamp to turn yellow, and when no vehicle passes through, the prompting lamp turns green.
Further, the thyristor dimming circuit comprises a diode D1, a diode D2, a diode D3, a diode D4, a dimming resistor R5, a dimming resistor R6, a single-pole double-throw switch SW1, a resistor R2, a resistor R3, an electrolytic capacitor C1, a light emitting diode D5 and a thyristor, wherein,
the diode D1 and the diode D3 are connected in series to form a bridge arm, the diode D2 and the diode D4 are connected in series to form a bridge arm, the two bridge arms are connected in parallel, one end of the dimming resistor R5 and one end of the dimming resistor R6 are respectively connected with two output ends of the single-pole double-throw switch SW1, the input end of the single-pole double-throw switch SW1 is simultaneously connected with the anode of the electrolytic capacitor C1 and one end of the resistor R2, the other end of the resistor R2 is simultaneously connected with one end of the resistor R3 and the control electrode G of the thyristor, the other ends of the dimming resistor R5 and the dimming resistor R6 and the cathodes of the diode D1 and the diode D2 are both connected with the anode of the light emitting diode D5, the cathode of the light emitting diode D5 is connected with the pin A of the thyristor, the K pin of the thyristor, the other end of the resistor R3 and the cathode of the electrolytic capacitor C1 are both connected with the anodes of the diode D3 and the anodes of the diode D4, and the two bridge arms are respectively connected with the two ends of the alternating current power supply.
Specifically, the circuit part adopts a relatively cheap and reliable silicon controlled rectifier as a core element, and the triggering and turning-off conditions of the silicon controlled rectifier are utilized to design a circuit as a figure.
The silicon controlled rectifier dimming circuit is shown in figure 1, a pin A of the silicon controlled rectifier is connected with the positive electrode of a power supply, a pin K of the silicon controlled rectifier is connected with the negative electrode, when an electrolytic capacitor is charged to a certain degree, a control electrode G reaches a specified forward voltage to meet a conduction condition, and a bulb shines in an overcurrent mode; because the rectified pulsating direct current flows in the circuit, when the current is smaller than the holding current of the silicon controlled rectifier, the silicon controlled rectifier is turned off, the lamp bulb is extinguished, and the next period is started.
The process described above takes place in a very short time, the bulb completes a fast cycle of light-dark-light-dark, which is not perceived by the human eye due to the visual residue. When the charging current of the capacitor is changed, the time of the thyristor changing from dark to bright is influenced, the small current can reach the holding current earlier, namely the time of switching from on to off is also influenced, the possibility of dimming is provided, and the idea of the whole circuit design is also provided.
When no vehicle or person is in the urban illumination road section at night, the system automatically reduces the brightness of the road illumination lamp and reduces the power consumption, and when the vehicle or person passes through the system, the system automatically detects the traveling distance of the vehicle or person and increases the brightness of the illumination lamp in the road section, so that the normal passing of the vehicle and the person is ensured.
The illumination selection in the model of fig. 2 considers that human eyes can obviously recognize, the lamp strip works in a recommended voltage range, and a series of elements with similar parameters such as resistors, capacitors and the like are purchased for carrying in debugging. The two dimming resistors are 20K and 10K, the illumination is proper when the electrolytic capacitor is 1 muF, the effective value of the high-illumination gear voltage is 12.55V, and the low-illumination gear voltage is 6.63V.
In a unit period (vehicle passing) of 3.14s, the high-illumination gear is opened for 2.9931s, and the low-illumination gear is opened for 2.7604s, namely, compared with the existing street lamp system, the high-illumination gear can save energy by 4.727%, and the low-illumination gear can save energy by 12.134%. Considering the condition that no vehicle or few vehicles exist in the system action time period, the street lamp is in a low illumination state most of time, so the energy-saving efficiency is close to 12.134%, and the energy-saving efficiency is already considerable for the lighting system.
The above embodiments are only used to help understanding the method of the present invention and the core idea thereof, and a person skilled in the art can also make several modifications and decorations on the specific embodiments and application scope according to the idea of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The intelligent street lamp system based on sound, light, pressure and infrared sensing, single chip microcomputer control and silicon controlled rectifier dimming is characterized by comprising a sensor, a single chip microcomputer and a silicon controlled rectifier dimming circuit, wherein the sensor, the single chip microcomputer and the silicon controlled rectifier dimming circuit are sequentially connected.
2. The intelligent streetlamp system based on acousto-optic, piezo-infrared sensing-single chip microcomputer control-thyristor dimming according to claim 1,
the sensor is used for sensing the passing of people or vehicles and further generating an electric signal to be sent to the single chip microcomputer;
the single chip microcomputer is used for capturing the electric signal of the sensor so as to control the silicon controlled rectifier dimming circuit;
and the silicon controlled rectifier dimming circuit is used for adjusting the on-off and illumination of the street lamp under the control of the single chip microcomputer.
3. The intelligent streetlamp system based on acousto-optic, pressure and infrared sensing-single chip microcomputer control-thyristor dimming according to claim 2, wherein the sensors comprise force-sensitive resistors, photoresistors, acoustic resistors and infrared sensors,
the force sensitive resistor is used for sensing whether a person or a vehicle treads on the road surface;
the photoresistor is used for sensing the illumination of the current road section;
the acoustic sensitive resistor is used for sensing the loudness of the current road section;
and the infrared sensor is used for sensing whether a person or a vehicle passes through the current road section.
4. The intelligent streetlamp system based on sound, light, pressure and infrared sensing-single chip microcomputer control-silicon controlled rectifier dimming according to claim 3, wherein the force-sensitive resistor is laid at the intersection and the tail of the road.
5. The intelligent streetlamp system based on acousto-optic, piezo-infrared sensing-single-chip microcomputer control-thyristor dimming according to claim 4, wherein for the single-chip microcomputer,
when the photosensitive resistor senses that the illumination is enough, the singlechip cannot receive electric signals from the force sensitive resistor, the acoustic sensitive resistor and the infrared sensor, namely the silicon controlled rectifier dimming circuit cannot be started;
when the force-sensitive resistor does not sense that a vehicle passes through, the force-sensitive resistor is in a standby state, and the singlechip controls the silicon controlled rectifier dimming circuit to maintain the street lamp at low illumination; when the force-sensitive resistor senses that a vehicle passes through, the singlechip controls the silicon controlled rectifier dimming circuit to adjust the street lamp to high illumination;
the sound-sensitive resistor is used as a supplement of the force-sensitive resistor, when the sound-sensitive resistor does not sense that a vehicle passes through, the sound-sensitive resistor is in a standby state, and the singlechip controls the silicon controlled rectifier dimming circuit to maintain the street lamp at low illumination; when the sound-sensitive resistor senses that a vehicle passes through, the singlechip controls the silicon controlled rectifier dimming circuit to adjust the street lamp to high illumination.
6. The system of claim 5, wherein the SCM is configured with a high illumination ON time period, and if the sensor does not generate a new electrical signal during the period of maintaining the high illumination, the SCM adjusts the street lamp to a low illumination by controlling the SCR dimming circuit after the street lamp maintains the high illumination to the preset high illumination ON time period.
7. The system of claim 6, wherein when the single-chip receives the electrical signal from the force-sensitive resistor in the sidewalk, the single-chip controls the street lamp to maintain high illumination for a longer time than the single-chip controls the street lamp to receive the electrical signal from the force-sensitive resistor in the motorway.
8. The intelligent streetlamp system based on acousto-optic, pressure and infrared sensing-singlechip control-thyristor dimming according to claim 6, wherein the thyristor dimming circuit comprises a diode D1, a diode D2, a diode D3, a diode D4, a dimming resistor R5, a dimming resistor R6, a single-pole double-throw switch SW1, a resistor R2, a resistor R3, an electrolytic capacitor C1, a light emitting diode D5 and a thyristor, wherein,
the diode D1 and the diode D3 are connected in series to form a bridge arm, the diode D2 and the diode D4 are connected in series to form a bridge arm, the two bridge arms are connected in parallel, one end of the dimming resistor R5 and one end of the dimming resistor R6 are respectively connected with two output ends of the single-pole double-throw switch SW1, the input end of the single-pole double-throw switch SW1 is simultaneously connected with the anode of the electrolytic capacitor C1 and one end of the resistor R2, the other end of the resistor R2 is simultaneously connected with one end of the resistor R3 and the control electrode G of the controllable silicon, the other ends of the dimming resistor R5 and the dimming resistor R6 and the cathodes of the diode D1 and the diode D2 are connected with the anode of the light-emitting diode D5, the cathode of the light emitting diode D5 is connected with the pin A of the controllable silicon, the pin K of the controllable silicon, the other end of the resistor R3 and the cathode of the electrolytic capacitor C1 are connected with the anodes of the diode D3 and the diode D4, and the two groups of bridge arms are respectively connected with the two ends of the alternating current power supply.
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