Design of infrared light control street light system

*1. Gannan Geological Survey Brigade, Jiangxi Bureau of Geology and Mineral Resources, Ganzhou 341000, China; 2. Modern Education Technology and Information Center, Southern Metallurgy College, Ganzhou 341000, China) New ideas for lights, and detailed analysis of the circuit principles of the system .

Key words: infrared; light control; thyristor; sensitivity setting of the sound and light control circuit of the street lamp system is very important, the sensitivity is too high, and the circuit stability is poor to achieve the purpose of energy saving. The sensitivity is too low, and the slow response of the circuit does not have the effect of voice control. In different occasions, the requirements for sensitivity of sound control are very different. To solve this problem, the author designed a road lamp system controlled by infrared light.

1 The main features are different from the conventional sound and light control. This system uses infrared light control technology to cut off the infrared light when pedestrians pass through the corridor, so that the street light is lit, so there is no noise pollution.

Stable and reliable, the infrared receiver of this circuit always receives the infrared light sent by the transmitter when the street light is off in normal state, even if there is an instantaneous presence of interference light, the circuit will not malfunction.

8) There is no dark area. Once the street light of a certain floor is lit, the adjacent upper and lower street lights are in a 'half-light' state, and the pedestrian will automatically go out after a period of time.

2 System composition block diagram only draws a schematic diagram of a certain floor and its adjacent two layers, the other layers are the same, street lights! It is two incandescent lamps mounted on the ceiling of the first floor, in parallel with the +1 on the upper layer, and the next layer! 1 Parallel, the infrared emitter and the receiving controller are respectively installed in the wall or wall on both sides of the corridor, and because of their small size, they can be respectively installed in the switch box.

When a pedestrian passes by at night, the human body blocks the light from the infrared emitter. At this time, the controller has no signal input, and the receiving period = visible light-sensitive photoresistor and no signal input when it is dark.) The receiving controller makes the thyristor! Turn on and delay for a certain time. At this time, An, "*," * +1, *1; four incandescent lamps are lit, and the +1st and -1 layers are in a 'semi-bright" state, waiting for the pedestrian to continue to go up. Or down.

When a pedestrian passes by during the day, the resistance of the visible light photoresistor becomes small due to illumination, and the cutoff is turned off regardless of whether the receiving controller receives infrared light.

3 The principle analysis of the infrared receiving controller is the electrical schematic diagram of the receiver. The AC power supply is transformer-transformed, % "%4 rectified, 2, 'r filtered, %* regulated, and 5V DC voltage is obtained as the receiver. And the operating voltage of the transmitter.

It is an infrared receiving diode. When there is infrared light, there will be photocurrent generated, and the current formed is >50! A, as long as 3> (+-.3) / (" / -) can make the saturation conduction, at this time 1C's 1 pin is low, the foot is high, after IC2, IC- transmission processing In the IC (11 pin output low level does not conduct, the street light does not light.

When the infrared light that is illuminated is blocked by the pedestrian, the current flowing through it is very small. The dark current in the figure shows the diode %8-%11 and the thyristor and the "+1 switch drive circuit, the role of 8 is! 2 provides the trigger current. %12-%15 and !1 constitute the "and 1 switch drive circuit, and constitute the delay circuit, its role is to make the street light delay off, change the value of C- or can adjust the delay time. 6,11,12,'4,'5,. %2,. The %3 and the photoresistor form a natural light detecting circuit when one or both of them are bright. %2 or cutoff, 1C's 2 pin is high, the detection circuit does not work. Only when. %2,. The detection circuit only works when %3 is turned on at the same time. The voltage of 2C's 2 feet = (/(6+5)X4.4)+0.6V, the resistance of * from glare to no light is from tens of ohms! +, the adjusted resistance can change the sensitivity of the detection circuit.

4 The circuit principle analysis of the infrared light emitter shows that the 5V DC working voltage of the circuit is provided by the receiving circuit. IQJCi and! 2. A rectangular wave oscillator with an oscillation frequency of 40 kHz is formed. This signal is amplified by IC- and IC4 and then pushed by 0 to make %! Infrared light with a carrier frequency of 40 kHz is emitted, due to the %! The peak current is 100mA, and the luminous efficiency of the output optical power infrared LED after the two infrared transmitting tubes are connected in series is about 20). The effective receiving distance is up to 7m, and the width of the corridor is mostly about 3m, which can completely make the receiving controller reliable. jobs.

5 calculation and selection of the original device 1)! 4 and Cl estimates. due to%! The emitted infrared light is f=40 kHz; the pulse width is 2/3T rectangular wave signal, so the potential of the 1 collector is 2/3T time and the pulse is high level 1/3T time is low.

In order to make the circuit in this period = 1/3 D = 1 / (3! 40! 103) = 8! 10, no malfunction occurs, the voltage at the ends of Ci is known from the figure, 1 is saturated when turned on 'f0 .3+0.7=1V. When 1 is cut off, the C2 voltage changes with time: to ensure that the circuit does not malfunction: to ensure that pedestrians can quickly illuminate when passing through the corridor. When the circuit response time <0.150A is passed, 1 can reliably enter the saturation region. It must be made to ensure that the dark current collector potential remains above 3.6V to ensure no bright current is passed. Must be IM=5nA;! Take 30). Substituting into the above formula: selection of other components: the core components of the infrared remote control transmitting and receiving circuit are the emitting diode and the receiving diode. The transmitting tube of this circuit selects 5IR880B, its peak wavelength is 880nm, the transmitting power is 12.25mW, the receiving tube Select 2CU33IR, its response spectrum is 700-1100nm corresponding to the launch tube, bright current >50A, dark current <5nA. Each of the transmitter and receiver uses a 74HC00 four-input NAND CMOS integrated circuit, other components The data is marked as shown in the figure.

System installation and commissioning: In order to ensure that the street lamp can be reliably extinguished when there is no pedestrian passing through the corridor, the infrared light emitted by the transmitter must be aligned with the receiving diode of the receiver. Since the infrared receiver of the system always receives the infrared light sent by the transmitter when the street light is off in a normal state, at this time, even if there is interference light, the circuit will not malfunction, so the system has high stability. Sex and anti-jamming ability.

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