CN87209549U - High precision photoelectric controller for road lamps - Google Patents

Abstract

The utility model relates to a high precision photoelectric controller for road lamps which is a device used for the automatic switch of the road lamps. The high precision photoelectric controller for road lamps is composed of a photoelectric convertor, a comparison amplifier, a given voltage comparator, a short time delayer, a relay, a given voltage switching over part. The high precision photoelectric controller for road lamps is characterized in that because a circuit section such as a proportional amplifier, a voltage comparator, an integration delayer, etc. is composed of an integrated operational amplifier, the control of switching on and off is precise, and the interference rejection is strong; the high precision photoelectric controller for road lamps can be regulated and measured in daytime, and the illumination intensity of switching off is different from the illumination intensity of switching on; the purpose of the utility model is to be suitable for people's visual sense requirement of high illumination intensity switching on and low illumination intensity switching off.

Description

High precision photoelectric controller for road lamps

The utility model belongs to street lamp automatic switch control device.

At present the road lamp switch automatic control equipment that uses generally consists of the following components: photoelectric switching circuit, dc amplification circuit and the switching circuit be made up of discrete component.Practicality is the result show, because semiconductor discrete component such as transistor cause the circuit self stability poor to the variations in temperature sensitivity, amplifies at dusk or the trickle photosignal of variation at daybreak with this circuit, and itself drifts about sometimes even can surpass effective signal of telecommunication.Therefore sort circuit can not reliablely and stablely be worked.

The purpose of this utility model is to improve sensitivity and the stability and the reliability of street lamp automatic control equipment, and at people between the lights with the different requirements of early morning to illuminance, realize a kind of new can be under different illumination the photoelectric lighting control device of open and close lamp.

Structured flowchart of the present utility model as shown in Figure 1.By opto-electronic conversion, ratio amplify, the switch lamp voltage ratio, short time delay, relay, long delay, given voltage switch several parts and form.Its course of work is: photoelectric conversion section becomes the illuminance occulting light signal in the external world into the corresponding signal of telecommunication; This signal of telecommunication obtains stable the amplification through proportional amplifier; The voltage signal that amplifies determines whether to carry out the conversion of open and close lamp through voltage comparator circuit and the voltage of having set or close modulating voltage and compare of turning on light; Short time delay circuit inserts one section time-delay to the switching signal of relatively circuit output, and purpose is to make this automatic control equipment be subjected to the short time at night to avoid taking place misoperation during strong illumination; The output control illuminating line switch relay of short time delay circuit; The function of long delay and switch lamp voltage given circuit is to turn on light between the lights after greater than 15 minutes time-delay, promptly treats day complete given voltage to be switched to the low-light (level) value after black, gets ready for turning off the light under low-light (level) daybreak next day.On the contrary, after turning off the light daybreak, through greater than 15 minutes time-delay, promptly treat automatically given voltage to be switched back the higher illuminance value after day light, for the dusk on the same day turns on light under higher illuminance and gets ready.After controller adds given commutation circuit, can realize " higher illuminance is turned on light at dusk, and daybreak, low-light (level) was turned off the light ", match with human vision property better.

The utility model adopts silicon photocell to make photoelectric sensor in photoelectric conversion section, varies with temperature less short circuit current characteristic for utilizing it, does its load with a small resistor.Proportional amplifier realizes with integrated operational amplifier, as shown in Figure 2.This amplifier is worked under dark negative feedback state, and closed loop gain is stable.Voltage comparator circuit is made of a rp-op amp, its circuit as shown in Figure 3, it act as the proportional amplifier output voltage U ₁With given voltage U ₀Relatively work as U ₁〉=-(R ₃)/(R ₄) U ₀+ (R3+R4)/(R5+R6) (R5)/(R4) | U ₂| the time, the comparator output voltage is about-12 volts, works as U ₁≤-(R ₃)/(R ₄) U ₀-(R ₃+ R ₄)/(R ₅+ R ₆) (R ₅)/(R ₄) | U ₂| the time comparator output voltage be+12 volts.Resistance R ₆Play positive feedback effect, it makes voltage comparator have hysteresis characteristic, and when the input voltage that can prevent comparator was in critical condition, output changed repeatedly.Short time delay and relay output circuit as shown in Figure 4, effect is to overcome the influence that the ambient light illumination short time causes when changing.Time of delay is desirable greater than 30 seconds.Voltage comparator and some resistance capacitances that short time delay circuit is made by amplifier constitute, and pass through R ₇To capacitor C ₁Discharge and recharge and play time-lag action.U at dark ₂Become negative value, capacitor C ₁The reverse charging of A end, current potential reduces gradually, when its current potential drops to current potential that amplifier in-phase input end B orders when following, amplifier output+12V voltage makes transistor BG ₁Conducting, illumination contactor C is connected in the relay adhesive; At day situation is opposite, U ₂Become on the occasion of, capacitor C ₁Back discharge, when its A point current potential is elevated to greater than amplifier in-phase input end B point current potential, amplifier output-12V voltage, transistor BG ₁End, relay disconnects, and cuts off the illumination contactor, long delay circuit and given voltage commutation circuit as shown in Figure 5, it mainly is made up of integrator, voltage comparator and given switching three parts.Utilize integrator input voltage mutation, output voltage that the performance that extremely slowly changes takes place thereupon, match, play the long delay effect with voltage comparator with hysteresis characteristic.The course of work of given commutation circuit is, when street lamp closes in daybreak, and U ₃Be low-voltage, U ₃Behind long delay, the voltage comparator output LOW voltage in the long delay circuit makes transistor BG ₂End.Given voltage U ₀From potentiometer W ₁The middle taking-up.This is a high voltage, and it is ready for turning on light at dusk.U when street lamp leaves at dusk ₃Be high voltage, behind long delay, long delay circuit output HIGH voltage, transistor BG ₂Conducting, potentiometer W ₂Be parallel to W ₁Two ends make given voltage U ₀Step-down, the low-light (level) during for early morning is turned off the light as preparation.Regulate W ₁The voltage of can givenly turning on light is regulated W ₂Can given pass modulating voltage.

The utility model and existing apparatus are compared its advantage and be: owing to realize circuit with integrated operational amplifier, make the highly sensitive of circuit, with the control of illumination change open and close lamp accurately, its antijamming capability is strong, stable performance; Switch lamp illumination is treated in being also advantageous in that of this device with a certain discrimination, " high illumination is turned on light at dusk, and early morning, low-light (level) was turned off the light ".The vision requirement that this not only meets people also helps electrical energy saving; The accent of this device is surveyed and can be carried out by day in addition, transfers and surveys conveniently.

As embodiment, accompanying drawing 6 has provided a circuit diagram that lighting controller is complete.Amplifier IC wherein ₂, IC ₃, IC ₄, IC ₅Can utilize same four high guaily unit integrated package.

Claims (4)

1, a kind of road lamp switch automatic control equipment is characterized in that: the photoelectric detective circuit in this device, ratio amplifying circuit, switch lamp voltage comparator circuit, short time delay and relay output circuit are connected in series successively, by relay control illumination contactor; The short time delay circuit output end signal also through long delay circuit, the given voltage commutation circuit effect of switch lamp, feeds back to switch lamp voltage comparator circuit input, for voltage comparator circuit provides comparative voltage in addition.

2, the automatic control equipment of mentioning in the claim 1, it is characterized in that: its photoelectric detective circuit is made transducer, is done the silicon photocell load with a series connection small resistor with silicon photocell, this resistance one end ground connection, the other end is connected to the proportional amplifier in-phase input end, the inverting input of proportional amplifier is through a low resistance grounding, connect a feedback resistance between the output of proportional amplifier and inverting input, amplifier is in dark negative feedback operating state.

3, the automatic control equipment of mentioning in the claim 1 is characterized in that: the potentiometer W in the switch lamp voltage commutation circuit ₂With transistor BG ₂After the series connection again with potentiometer W ₁Be in parallel transistor BG ₂Base voltage controlled by the voltage comparator output state in the long delay circuit, make transistor BG ₂Be in conducting respectively or end one of two states.

4, the automatic control equipment of mentioning in the claim 1 is characterized in that: switch lamp voltage comparator circuit, short time delay circuit, the shared same four high guaily unit integration module of long delay circuit.

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