CN107846757A

CN107846757A - A kind of LED street lamp of high efficiency low-temperature-rise

Info

Publication number: CN107846757A
Application number: CN201711245909.3A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-11-25
Filing date: 2017-11-25
Publication date: 2018-03-27

Abstract

A kind of LED street lamp of high efficiency low-temperature-rise, a kind of LED street lamp with automatic dimming function is disclosed, the power factor of street lamp is more than 0.9, expeditiously to convert electrical energy into luminous energy, and timing automatic dimming function is utilized, LED street lamp is reduced about 25% or so than the power consumption of the like product of in the market；The luminescent screen circuit of street lamp uses to be connected in series and using timing automatic dimming function, ensures that the operating temperature of LED street lamp is maintained at less than 50 degree, realize LED application theorem " when LED operation temperature is less than 50 degree, service life is 50,000 hours " all the way；50000 hours, calculated with the averagely daily working 12 hours of street lamp, then the service life of street lamp can reach more than 11 years.

Description

A kind of LED street lamp of high efficiency low-temperature-rise

Technical field

The present invention relates to a kind of LED street lamp of high efficiency low-temperature-rise.

Background technology

LED street lamp in the market, general power factor is all very low, the patent of my invention：One kind is to adjust automatically surely The LED street lamp of pressure/light, the patent No.：201210200175.8, although having automatic power regulation energy, the power factor of LED street lamp is very It is low, only 0.6 or so, power factor is too low, can influence the utilization rate of power network electric energy, can increase the power supply cost of power supply department. It is the LED street lamp of in the market again, the circuit structure of luminescent screen LED strip is all to be combined connection, wiring in parallel using series and parallel LED work total current is caused to increase, the electric energy of street lamp changes into the quantity increase of heat energy, causes the operating temperature of street lamp to surpass Mark, LED street lamp is produced light decay, had a strong impact on the fractional energy savings and service life of LED street lamp.

The content of the invention

A kind of LED street lamp of high efficiency low-temperature-rise of the present invention, discloses a kind of operating temperature that can make street lamp and is maintained at 50 degree Hereinafter, ensure that the service life of LED street lamp reaches 50,000 hours, power factor is improved more than 0.9.

A kind of LED street lamp of high efficiency low-temperature-rise, its circuit structure is by single phase bridge type rectifier circu, power factor compared with positive electricity Road, pulse width modulation circuit, timer circuit and LED luminescent screens circuit composition.

Brief description of the drawings

Fig. 1 is a kind of circuit theory diagrams of the LED street lamp of high efficiency low-temperature-rise.

Embodiment

As shown in figure 1, B1 is single phase bridge type rectifier circu, it becomes alternating current 220V in the direct current of pulsation, gives next Level circuit of power factor correction.C1, C2, D1, D2, D3 and R1 form power factor emphasizer circuit, and it is utilized in appliance circuit Fill valley principle carrys out correcting power factors, and the low power factor of rectifier is brought up to more than 0.9.

As shown in figure 1, IC1 and outside for circuit form pulse width modulation circuit, IC1 is the when base counting chip of model 555, 2,6,7 pin external resistance R4, R5, R6, electric capacity C5 and diode D5, D6 composition pulse width modulation circuit, by timer circuit Relay normally opened contact J1 and normally-closed contact J2 control.When normally opened contact J1 is closed, and normally-closed contact J2 disconnects, the 3 of IC1 The big burst signal of pin output duty cycle, effect FET T1 export high voltage, supply the luminescent screen LED to connect all the way String work, now, LED street lamp is operated in vehement bright operating mode；When normally-closed contact J2 is closed, and normally opened contact J1 disconnects, IC1's The small pulse signal of the pin output duty cycle of output end 3, effect FET T1 export relatively low voltage, supply the hair connected all the way Tabula rasa LED strip works, and now, LED street lamp is operated in reduce and worked under about 20% power condition.C5 is that the frequency of pulse-width regulated is set Determine element, when C5 selects small value, pulse duration frequency is high, conversely then low.

As shown in figure 1, IC2 and peripheral circuit composition timer circuit, IC2 model CD4060, IC2 12 pin are external Electric capacity C10, resistance R9 composition electrifying self-resetting circuit, just obtained the moment of power supply in IC2, self-resetting circuit exports a positive arteries and veins 12 pin of the signal to IC2 are rushed, act on IC2 internal circuit starting of oscillation, its pin of output end 3 output low level signal, make the three of positive-negative-positive Pole pipe T2 is turned on, and drives relay J adhesives, its normally opened contact J1 closures, and normally-closed contact J2 disconnects, and acts on IC1 output duty cycles Big signal pulse, external resistance R10, electric capacity C11 the composition timer time setup parameter of pin is driven, selects suitable value, i.e., Timing needed for meeting.When setting time counting then, the IC2 pin of output end 3 is then changed into high level from low level Signal, act on two loops：One makes PNP type triode T2 be changed into ending from turning on, and relay J is changed into tripping from adhesive, its Normally opened contact J1 trippings, normally-closed contact J2 closures, act on the small signal of the IC1 pin output duty cycle of output end 3, make FET T1 exports relatively low voltage signal, make luminescent screen LED strip be operated in light modulation after power consumption about reduce in 50% operating mode；Another Effect is 11 pin that high level signal is sent to IC2, makes IC2 internal oscillator circuit failure of oscillations, and this present situation maintains down always.

As shown in figure 1, V is piezo-resistance, the transient overvoltage impact such as anti-lightning strike is played in circuit.B1, B2 are single-phase Bridge rectifier.R8, C7 form capacitance-resistance voltage reduction circuit, and D10 is fly-wheel diode, plays protective relay J safety in circuit. R3 is current-limiting resistance, is connected in luminescent screen circuit, plays metering function.

Claims

1. a kind of LED street lamp of high efficiency low-temperature-rise, its circuit structure is by single phase bridge type rectifier circu, power factor compared with positive electricity Road, pulse width modulation circuit, timer circuit and LED luminescent screens circuit composition, it is characterised in that：Single phase bridge type rectifier circu it is defeated Enter end to be connected with mains 220V power supplys, output end is connected with circuit of power factor correction；Pulse width modulation circuit is by timer Circuit controls, and when street lamp is just started working, the big drive signal of pulse width modulation circuit output duty cycle, makes FET T1 defeated Go out the specified power of LED string, LED street lamp is operated in vehement bright operating mode, facilitates the pedestrian on traffic route and vehicle to run； When one setting time of street lamp work is count down to, pulse width modulation circuit changes the small drive signal of output duty cycle again, to close Suitable operating voltage, the power drive LED strip for making FET T1 to reduce about 50% work, and it is later half to ensure that LED street lamp is avoided Harm of the night circuit extra-high voltage to street lamp, and LED street lamp is kept operating temperature below 50 degree；Luminescent screen LED strip Circuit, when street lamp general power is below 56W, circuit connection uses series wiring, and be 5W with a power all the way, and resistance is fitted When being in series；The lamp bead of LED strip is 1W from monolithic power, and Zener diode function is carried inside lamp bead, and ensureing to work as has When a piece of lamp bead is burnt out, its series circuit is not turned off, and allows the LED not burnt out can normal work；When the power of LED street lamp is more than During 56W, it is extended from units of 42 or 56W, now, suitable R3 values is selected, to ensure that it is specified that LED strip is operated in In constant current operating mode.