CN101600275B - Working circuit of LED streetlamp - Google Patents
Working circuit of LED streetlamp Download PDFInfo
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- CN101600275B CN101600275B CN2009101012965A CN200910101296A CN101600275B CN 101600275 B CN101600275 B CN 101600275B CN 2009101012965 A CN2009101012965 A CN 2009101012965A CN 200910101296 A CN200910101296 A CN 200910101296A CN 101600275 B CN101600275 B CN 101600275B
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- Y02B20/72—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps in street lighting
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Abstract
The invention provides a working circuit of an LED streetlamp, which comprises a switch power module, an LED module, a constant current module, a voltage reducing module and a main control module, and is characterized in that: the working circuit also comprises an optically controlled detection module which comprises a first signal output end; the main control module comprises a first input end and a control end; and the constant current module comprises a trigger end, wherein the first signal output end of the optically controlled detection module is connected with the first input end of the main control module, and the control end of the main control module is connected with the trigger end of the constant current module. Compared with the prior art, the working circuit is provided with the optically controlled detection module on the basis of an LED driving circuit to convert intensity change of environmental light to electric signals and transmit the electric signals to the main control module, so that the LED streetlamp can automatically determine the on and off state of output according to requirements, is automatically turned on in dark and turned off in daylight, saves more energy and electricity, and effectively avoids application waste.
Description
Technical field
The present invention relates to a kind of operating circuit of street lamp, particularly a kind of operating circuit of LED street lamp.
Background technology
Street lamp is the important component part of city illumination, traditional street lamp often adopts high-pressure sodium lamp, high-pressure sodium lamp on the whole light efficiency is low, caused the huge waste of the energy, therefore, development of new is efficient, energy-conservation, the life-span is long, color rendering index is high, the street lamp of environmental protection is of great significance the energy-conservation tool of city illumination.
Light-emitting diode (LED:Light Emitting Diode) is based on the high efficiency solid-state light source that the faint electric energy of usefulness that semiconductor PN forms just can be luminous, under certain forward bias voltage and Injection Current, the electronics that injects the hole in P district and injection N district sends photon diffusing to active area by radiation recombination, electric energy is converted into luminous energy.Compare with the conventional road lamp illumination, the LED street lamp has the following advantages: the one-way of (1), light, there is not diffusion of light, and guarantee light efficiency; (2), the source efficiency of LED is high, the overall light efficiency LED street lamp is stronger than high-pressure sodium lamp; (3), the light decay of LED street lamp is little, can be lower than high-pressure sodium lamp in the design of using power; (4), light efficiency is high, the chip that employings 〉=100LM is above, energy-conservation more than 75% with respect to conventional high-tension sodium vapor lamp energy; (5), LED is low-voltage device, the voltage that drives single LEDs is safe voltage, series of products list LEDs power all is 1 watt, it be one than using the safer power supply of high voltage source.In sum, the energy-saving effect of LED street lamp is remarkable, have efficient, safety, environmental protection, etc. particular advantages, can be widely used in city illumination.
In the prior art, be that the Chinese utility model " a kind of led drive circuit " of ZL200620054750.8 discloses a kind of led drive circuit such as the patent No., it comprises AC/DC circuit, DC/DC circuit, constant-current circuit, LED lamp, control circuit, detector unit; The AC/DC circuit is the rectification of 12V AC power, obtain+16V ,+the 5V direct current is to each circuit work power; The output of AC/DC circuit connects the input of DC/DC circuit; The output of DC/DC circuit connects the input of constant-current circuit, and the DC/DC circuit is that direct current 10.5V is as the input voltage of constant-current circuit with 16V direct current lowering and stabilizing blood pressure; The output of constant-current circuit connects the LED lamp.But, foregoing circuit only provides power circuit and the drive circuit of LED lamp, do not consider that LED uses the as required requirement of illumination as street lamp, the switching of the street lamp that can't control according to the brightness of surrounding environment, the phenomenon that the darkness street lamp is not also opened or street lamp is still worked after daybreak might occur, cause certain wasting of resources; And the foregoing circuit circuit also can't in time be adjusted the operating current size of LDE lamp work, after the long-time illumination of LED lamp, can raise because of the heating temperature, if excess Temperature then is easy to damage the LED lamp, cause the LED lamp on the whole series circuit all can't normally use; In addition, in the existing LED street lamp circuit, it all is the mode that adopts a plurality of LED lamp series connection, the shortcoming of this connected mode is: when one of them LED lamp breaks down, such as electric current during excessive or mechanical failure, will cause that other LED lamp on the series circuit also can't work, shorten thus the useful life of street lamp, also so that the increase of the maintenance cost of street lamp.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of can control the LED street lamp operating circuit that street lamp opens and closes according to the brightness of surround lighting for above-mentioned prior art present situation, this operating circuit can satisfy the requirement that street lamp throws light on as required, in the situation of illumination abundance, can in time close street lamp, more energy-conserving and environment-protective.
The present invention solves the problems of the technologies described above the technical scheme that adopts: the operating circuit of this LED street lamp includes
Switch power module (a) is converted to direct current output with the alternating current of inputting;
Led module (c), a plurality of light-emitting diodes (led) with mutual series connection, and, one end of described series connection light-emitting diode is the anode input (c+) of this led module, and the other end of described series connection light-emitting diode is the negative electrode input (c-) of this led module;
Constant flow module (b) carries out filtering and realizes power supply to described led module (c) described direct current;
Voltage reduction module (d) includes dc output end (d1), and this voltage reduction module is realized the direct current through described switch power module conversion is carried out again step-down; And
Main control module (e), in order to the conducting of controlling described constant flow module (b) with close, the power input (e1) of this main control module (e) and the dc output end (d1) of described voltage reduction module (d) link to each other;
It is characterized in that: also include a light-operated detection module (f), the variation of surround lighting is converted to the signal of telecommunication and controls the conducting of described constant flow module (b) through described main control module (e) and close, this light-operated detection module (f) includes first signal output (f1), and, described main control module (e) includes first input end (e2) and control end (e3), described constant flow module (b) includes a trigger end (b1), wherein, the first signal output (f1) of described light-operated detection module (f) and the first input end (e2) of described main control module (e) link to each other, and the control end (e3) of this main control module (e) and the trigger end (b1) of described constant flow module (b) link to each other.
In use burn out the LED lamp because of excess Temperature for fear of street lamp, also include a temperature control detection module (g) that can detect LED lamp heating temp, this temperature control detection module can be regulated the operating current of LED lamp, the heating temp of the light-emitting diode (led) in the described led module (c) is converted to the signal of telecommunication, and the size of current that this signal of telecommunication is regulated described constant flow module (b) through described main control module (e), wherein, described temperature control detection module (g) includes secondary signal output (g1), correspondingly, described main control module (e) includes the second input (e4), and the secondary signal output (g1) of described temperature control detection module (g) links to each other with second input (e4) of described main control module (e).So, when the LED light temperature is too high, by temperature detecting module signal is passed to main control module, thereby control again constant flow module with current reduction, and then so that the operating current of LED lamp reduces, the operating circuit of avoiding the LED lamp is excessive and high temperature that cause damages, and guarantees the normal operation of street lamp.
Described temperature control detection module (g) can adopt following circuit structure simply, include the 6th resistance (R6) and be close to the temperature sensitive resister (Rt) that light-emitting diode (led) arranges, wherein, the dc output end (d1) of one end of described the 6th resistance (R6) and described voltage reduction module (d) links to each other, the other end one tunnel of the 6th resistance (R6) is through described temperature sensitive resister (Rt) ground connection, and another road links to each other as the secondary signal output (g1) of this temperature control detection module (g) and second input (e4) of described main control module (e).When the temperature of light-emitting diode (led) raises; the resistance of temperature sensitive resister (Rt) can and reduce along with the temperature rising; so that secondary signal output (g1) magnitude of voltage of the temperature control detection module (g) that links to each other with second input (e4) of main control module (e) reduces; when being lower than predetermined value; main control module output high level and then triggering constant flow module come the size of regulation output electric current, effectively play the superheat protecting function to light-emitting diode in the led module.
Described light-operated detection module (f) can adopt following electric current syndeton, include the 7th resistance (R7) and photo resistance (Re), wherein, the dc output end (d1) of one end of described the 7th resistance (R7) and described voltage reduction module (d) links to each other, the other end one tunnel of the 7th resistance (R7) is through described photo resistance (Re) ground connection, and another road links to each other as the first signal output (f1) of this light-operated detection module (f) and the first input end (e2) of described main control module (e).Wherein, the resistance of photo resistance increases along with weakening of surround lighting, reduce along with the enhancing of surround lighting, when at dark, the resistance of photo resistance increases, so that the magnitude of voltage of the first signal output (f1) of the light-operated detection module (f) that links to each other with the first input end (e2) of main control module (e) raises, when being higher than predetermined value, main control module output high level and then triggering constant flow module are so that the light-emitting diode conducting of led module is opened and controlled to the internal switch of constant flow module; When at day, can close again the switch of constant flow module inside, so that street lamp can be realized the requirement of throwing light on as required.
Described constant flow module (b) can adopt various circuit structure of the prior art, as preferably, can have first integrated chip (IC1) of 8 pins as core take one, also include the first diode (D1), the first electrochemical capacitor (C1), the second electric capacity (C2), the first resistance (R1), the second resistance (R2), the 3rd resistance (R3) and inductance (L), wherein, the positive pole one tunnel of described the first electrochemical capacitor (C1) links to each other with the output of described switch power module (a), another road links to each other with the negative electrode of described the first diode (D1), the minus earth of described the first electrochemical capacitor (C1), the anode one tunnel of described the first diode (D1) links to each other with 5 pin of described the first integrated chip (IC1), another road links to each other through the negative electrode input (c-) of described inductance (L) and described led module (c), and, 5 pin of this first integrated chip (IC1) and 6 pin connect altogether and are a bit, the anode input (c+) of 1 pin of this first integrated chip (IC1) and described led module (c) links to each other, 2 pin of this first integrated chip (IC1) link to each other with the positive pole of described the first electrochemical capacitor (C1), also be parallel with described the first resistance (R1) between 1 pin of described the first integrated chip (IC1) and 2 pin, 3 pin and 4 pin of described the first integrated chip (IC1) connect rear ground connection altogether, 8 pin one tunnel of this first integrated chip (IC1) are through described the 3rd resistance (R3) ground connection, another road is through described the second electric capacity (C2) ground connection, and 7 pin of this first integrated chip (IC1) link to each other as the trigger end (b1) of this constant flow module (b) and the control end (e3) of described main control module (e) through described the second resistance (R2).The first integrated chip that described constant flow module adopts is the driver of a step-down constant current high-brightness LED, and it adopts special-purpose pulse-width modulation (RWM) input, can realize the pulsed LED brightness regulation of wide brightness range.
Described voltage reduction module (d) can adopt the secondary decompression mode, include the first three terminal regulator (IC3) and the second three terminal regulator (IC4), also include the second diode (D2), the 3rd electric capacity (C3), the 3rd diode (D3), the 4th electric capacity (C4), the 5th electric capacity (C5) and the 4th resistance (R4), wherein, the anode of described the second diode (D2) links to each other with the output of described switch power module (a), the negative electrode one tunnel of this second diode (D2) is through described the 3rd electric capacity (C3) ground connection, the input (m1) of another road and described the first three terminal regulator (IC3) links to each other, the earth terminal (m3) of this first three terminal regulator (IC3) is ground connection directly, output (m2) a tunnel of this first three terminal regulator (IC3) links to each other with the anode of described the 3rd diode (D3), another Lu Jingdi four electric capacity (IC4) ground connection, the negative electrode of described the 3rd diode (D3) links to each other through the input (n1) of the 4th resistance (R4) and the second three terminal regulator (IC4), the earth terminal (n3) of this second three terminal regulator (IC4) is ground connection directly, the output (n2) one tunnel of this second three terminal regulator (IC4) is through the 5th electric capacity (C5) ground connection, and another road links to each other as the dc output end (d1) of whole voltage reduction module (d) and the power input (e1) of described main control module (e).The purpose of described voltage reduction module is for will be through the DC power supply step-down after the switch power module conversion to satisfy the power supply requirement of main control module.
In order to receive the signal of temperature control detection module and light-operated detection module, and with this signal feedback to constant flow module, described main control module (e) can comprise the second integrated chip (IC2) with 14 pins, also include the 4th diode (D4), the 5th resistance (R5) and the 6th electric capacity (C6), the 4 pin first via of described the second integrated chip (IC2) link to each other through the dc output end (d1) of described the 5th resistance (R5) and described voltage reduction module (d), the second the tunnel through described the 6th electric capacity (C6) ground connection, Third Road links to each other with the anode of described the 4th diode (D4), the dc output end (d1) of the negative electrode of the 4th diode (D4) and described voltage reduction module (d) links to each other, the direct ground connection of 5 pin of described the second integrated chip (IC2), the dc output end (d1) of the direct and described voltage reduction modules of 10 pin of this second integrated chip (IC2) (d) links to each other, 8 pin of this second integrated chip (IC2) link to each other as the control end (e3) of this main control module (e) and the trigger end (b1) of described constant flow module (b), 14 pin of this second integrated chip (IC2) are through described photo resistance (Re) ground connection, and 13 pin of this second integrated chip (IC2) are through described temperature sensitive resister (Rt) ground connection.Described main control module can realize that detection signal is converted to the PWM input signal passes to constant flow module, thereby is realized the size of current control of led module and the as required lighting requirement of realizing street lamp by constant flow module.
Because the light-emitting diode in the led module is mutually series connection; in order to prevent causing after single light-emitting diode from damaging that series circuit disconnects; thereby cause other light-emitting diode all can't normally use; described led module (c) also is parallel with respectively a LED protector (h) at the two ends of each light-emitting diode (led), to realize the overcurrent protection to the series connection light-emitting diode of this led module.When single light-emitting diode damaged, the LED protector can be so that the voltage at these light-emitting diode two ends remains on steady state value, and continued to keep the normal operating conditions of street lamp, the useful life of having improved street lamp.
As preferably; described LED protector (h) can be a voltage-stabiliser tube (D); the negative electrode of this voltage-stabiliser tube (D) links to each other with the anode of the light-emitting diode (led) of correspondence, and the anode of this voltage-stabiliser tube (D) links to each other with the negative electrode of the light-emitting diode (led) of correspondence.
As further preferred; described LED protector (h) can also for: including controllable silicon (T) and model is the control circuit (IC5) of NUD4007; this control circuit (IC5) is connected in parallel on control end (K) and the anode two ends of described controllable silicon (T); and; the anode of described controllable silicon (T) links to each other with the anode of corresponding light-emitting diode (led), and the negative electrode of this controllable silicon (T) links to each other with the negative electrode of corresponding light-emitting diode (led).
Compared with prior art, the invention has the advantages that: increased light-operated detection module on the basis of led drive circuit, this light-operated detection module is for detection of the power of surround lighting, and the Strength Changes of surround lighting is converted to electrical signal transfer to main control module, thereby so that the LED street lamp can be determined the output on off operating mode as required automatically, namely ought be at dark, the LED street lamp can be opened automatically, and ought be at day, the LED street lamp again can autoshutdown, thereby more energy saving avoids using waste effectively.
Description of drawings
Fig. 1 is the street lamp operating circuit theory diagram of the embodiment of the invention.
Fig. 2 is the concrete circuit connection diagram of the street lamp operating circuit of the embodiment of the invention.
Fig. 3 is one of physical circuit figure of LED protector shown in Fig. 2.
Fig. 4 be LED protector shown in Fig. 2 physical circuit figure two.
Embodiment
Embodiment is described in further detail the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, the operating circuit theory diagram for LED street lamp of the present invention includes
Switch power module a is converted to direct current output with the input AC electricity;
Led module c is comprised of a plurality of light-emitting diode led of mutual series connection, and wherein, the first order of series connection light-emitting diode is as the anode input c+ of this led module, and the other end of series connection light-emitting diode is then as the negative electrode input c-of this led module;
Constant flow module b carries out the filtering constant current to the 48V direct current, and forms a current circuit with described led module c;
Voltage reduction module d includes dc output end d1, and this voltage reduction module is realized the 48V direct current through the switch power module conversion is carried out again step-down; And
Main control module e, in order to the conducting of controlling constant flow module b with close, the power input e1 of this main control module e links to each other with the dc output end d1 of voltage reduction module d;
Light-operated detection module f, the variation of surround lighting is converted to the signal of telecommunication and controls the conducting of constant flow module b through main control module e and close, this light-operated detection module f includes first signal Ausgang 1, and, main control module e includes first input end e2 and control end e3, constant flow module b includes a trigger end b1, wherein, the first signal Ausgang 1 of light-operated detection module f links to each other with the first input end e2 of main control module e, and the control end e3 of this main control module e links to each other with the trigger end b1 of constant flow module b; And
Temperature control detection module g, the heating temp of light-emitting diode led among the led module c is converted to the signal of telecommunication, and with this signal of telecommunication through main control module e and the size of current of regulating constant flow module b, wherein, temperature control detection module g includes secondary signal output g1, correspondingly, main control module e includes the second input e4, and the secondary signal output g1 of temperature control detection module g and the second input e4 of main control module e link to each other.
Light-operated detection module in the present embodiment is for detection of the power of surround lighting, can automatically open or close according to the variation of surround lighting to realize the LED street lamp, and be provided with temperature sensitive resister near light-emitting diode led in the temperature control detection module, this temperature sensitive resister can inducing luminous diode temperature, when excess Temperature, the temperature control detection module sends signal to constant flow module by main control module, and then is adjusted the operating current of led module by constant flow module.
Fig. 2, Fig. 3 are a concrete circuit connection diagram according to the present embodiment of above-mentioned electric current principle figure design, this circuit at first is converted to the 48V direct current by switch power module a with the 220V alternating current, and the output of this switch power module a connects respectively constant flow module and voltage reduction module.
Wherein, constant flow module b includes 8 pins the first integrated chip IC1 that model is MAX16832A, this first integrated chip IC1 is voltage-dropping type constant current high-brightness LED (HB LED) driver, it is operated in+6.5V to 65V input voltage range, output current can be adjusted to up to 700mA by the flash current sense resistor of chip internal, this first integrated chip also has unique pulse-width modulation (PWM) input, can support wider pulse regulation LED brightness range, namely when the luminous diode temperature in the led module exceeds assigned temperature, can reduce the LED electric current;
Constant flow module b also includes the first diode D1, the first electrochemical capacitor C1, the second capacitor C 2, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3 and inductance L, wherein, the positive pole one tunnel of the first electrochemical capacitor C1 links to each other with the output of switch power module a, another road links to each other with the negative electrode of the first diode D1, the minus earth of the first electrochemical capacitor C1, the anode one tunnel of the first diode D1 links to each other with 5 pin of the first integrated chip IC1, another road links to each other through the negative electrode input c-of inductance L and led module c, and, 5 pin of this first integrated chip IC1 and 6 pin connect altogether and are a bit, 1 pin of this first integrated chip IC1 and the anode input c+ of led module c link to each other, 2 pin of this first integrated chip IC1 and the positive pole of the first electrochemical capacitor C1 link to each other, also be parallel with the first resistance R 1 between 1 pin of the first integrated chip IC1 and 2 pin, 3 pin and 4 pin of the first integrated chip IC1 connect rear ground connection altogether, 8 pin one tunnel of this first integrated chip IC1 are through the 3rd resistance R 3 ground connection, another road the second capacitor C 2 ground connection, 7 pin of this first integrated chip IC1 link to each other as the trigger end b1 of this constant flow module b and the control end e3 of main control module e through the second resistance R 2.
First three terminal regulator IC3 and the model of voltage reduction module d take model as LM7824 is core as the second three terminal regulator IC4 of LM7805, also include the second diode D2, the 3rd capacitor C 3, the 3rd diode D3, the 4th capacitor C 4, the 5th capacitor C 5 and the 4th resistance R 4, wherein, the anode of the second diode D2 links to each other with the output of switch power module a, the negative electrode one tunnel of this second diode D2 is through the 3rd capacitor C 3 ground connection, another road links to each other with the input m1 of the first three terminal regulator IC3, the direct ground connection of earth terminal m3 of this first three terminal regulator IC3, the output m2 one road of this first three terminal regulator IC3 and the anode of the 3rd diode D3 link to each other, another Lu Jingdi four capacitor I C4 ground connection, the negative electrode of the 3rd diode D3 links to each other through the input n1 of the 4th resistance R 4 with the second three terminal regulator IC4, the direct ground connection of earth terminal n3 of this second three terminal regulator IC4, the output n2 one tunnel of this second three terminal regulator IC4 is through the 5th capacitor C 5 ground connection, and another road links to each other as the dc output end d1 of whole voltage reduction module d and the power input e1 of main control module e.
Main control module e comprises that model is 14 pin the second integrated chip IC2 of EM78P258N, the second integrated chip IC2 is after powering on, inner beginning timing, realize as required opening and closing to street lamp by light-operated detection module f, it is more energy saving of street lamp, inside at the second integrated chip IC2 also is provided with temperature value, can be supervised by temperature detecting module g the variation of the temperature value of controlled LED lamp, after surpassing certain temperature value, send control signal to constant flow module b, and then the operating current of adjusting street lamp, wherein, 8 pin of this second integrated chip IC2 are as linking to each other as the control end e3 of this main control module e and the trigger end b1 of described constant flow module b, 14 pin of this second integrated chip IC2 link to each other as the first input end e2 of this main control module e and the first signal Ausgang 1 of light-operated detection module f, and 13 pin of this second integrated chip IC2 link to each other as the second input e4 of this main control module e and the secondary signal output g1 of temperature control detection module h;
Also include the 4th diode D4, the 5th resistance R 5 and the 6th capacitor C 6, the 4 pin first via of the second integrated chip IC2 link to each other through the dc output end d1 of the 5th resistance R 5 and described voltage reduction module d, the second the tunnel through the 6th capacitor C 6 ground connection, Third Road links to each other with the anode of the 4th diode D4, the dc output end d1 of the negative electrode of the 4th diode D4 and voltage reduction module d links to each other, the direct ground connection of 5 pin of the second integrated chip IC2,10 pin of this second integrated chip IC2 directly link to each other with the dc output end d1 of voltage reduction module d.
Temperature control detection module g includes the 6th resistance R 6 and temperature sensitive resister Rt, temperature sensitive resister Rt arranges and is fixed on the lamp housing of LED street lamp near luminescence method diode led, heating temp for detection of light-emitting diode led, when temperature raises, the resistance of temperature sensitive resister Rt diminishes, when temperature reduces, it is large that the resistance of temperature sensitive resister Rt becomes, wherein, one end of the 6th resistance R 6 links to each other with the dc output end d1 of voltage reduction module d, the other end one tunnel of the 6th resistance R 6 is through temperature sensitive resister Rt ground connection, and another road links to each other with 13 pin of the second integrated chip IC2 among the main control module e as the secondary signal output g1 of this temperature control detection module g.
Light-operated detection module f includes the 7th resistance R 7 and photo resistance Re, the resistance of photo resistance Re changes along with the variation of external surround lighting, when surround lighting dies down, it is large that the resistance of photo resistance Re becomes, when surround lighting strengthens, the resistance of photo resistance Re diminishes, wherein, one end of the 7th resistance R 7 links to each other with the dc output end d1 of voltage reduction module d, the other end one tunnel of the 7th resistance R 7 is through photo resistance Re ground connection, and another road links to each other with 14 pin of the second integrated chip IC2 among the main control module e as the first signal Ausgang 1 of this light-operated detection module f.
Cause can't working of whole series LED circuit for fear of single light-emitting diode damage, led module c also is parallel with respectively a LED protector h at the two ends of each light-emitting diode led, to realize the overcurrent protection to the series connection light-emitting diode of this led module; Simply, this LED protector h can be a voltage-stabiliser tube D, and the negative electrode of voltage-stabiliser tube D links to each other with the anode of the light-emitting diode led of correspondence, and the anode of voltage-stabiliser tube D links to each other with the negative electrode of the light-emitting diode led of correspondence; LED protector h also can be for by controllable silicon T and model being the protective circuit that the control circuit IC5 of NUD4007 forms; wherein; control circuit IC5 is connected in parallel on control end K and the anode two ends of controllable silicon T; and; the anode of controllable silicon T links to each other with the anode of corresponding light-emitting diode led, and the negative electrode of controllable silicon T links to each other with the negative electrode of corresponding light-emitting diode led.
The circuit working principle of present embodiment is:
Civil power 220V alternating current becomes the 48V direct current by switch power module a step-down, and power for constant flow module b, realize the galvanic step-down of 48V by voltage reduction module d simultaneously, wherein, constant flow module b provides a constant operating current through the filtering constant current to led module c, at this moment, 7 pin of the first integrated chip IC1 do not have the triggering signal input among the constant flow module c, the first integrated chip IC1 does not work, and no current passes through on the inductance L, and led module is not worked, light-emitting diode is in closed condition, the first diode D1 among the constant flow module b prevents that for reverse setting the output end current of switch power module a directly is added on the led module, avoids light-emitting diode to damage;
By the 48V direct current of switch power module a output in voltage reduction module d the first three terminal regulator IC3 and twice step-down of the second three terminal regulator IC4 after obtain the 5V operating voltage and power to main control module e, 10 pin of the second integrated chip IC2 are for being power input, 4 pin of the second integrated chip IC2 connect one by the 5th resistance R 5, the reset circuit that the 4th diode D4 and the 6th capacitor C 6 form, this reset circuit guarantees that single-chip microcomputer is got back to initial condition when powering on, and the transient high voltage that prevents infringement single-chip microcomputer, when powering up, the pulse signal (pwm signal) of an ascending variable impulse width of the second integrated chip IC2 output is given the first integrated chip IC1 of constant flow module b, realize soft start function, prevent that electrical network is to the impact of LED.
When surround lighting weakens, during i.e. sky blackening, it is large that photo resistance Re resistance among the light-operated detection module f becomes, the magnitude of voltage of 14 pin of the second integrated chip IC2 raises, when voltage is higher than set point, the second integrated chip IC2 is by the first integrated chip IC1 of high level switching signal of 8 pin output to constant flow module b, the first integrated chip IC1 conducting, so, the output of switch power module a charges to inductance L through the first integrated chip IC1, and, in the first resistance R 1, the first integrated chip IC1, form current circuit between inductance L and the led module, the light-emitting diode led of series connection is lit, and street lamp is started working; When surround lighting strengthens, when namely it beginning is bright, photo resistance Re resistance among the light-operated detection module f diminishes, the magnitude of voltage of 14 pin of the second integrated chip IC2 reduces, when voltage was lower than set point, the second integrated chip IC2 gave the first integrated chip IC1 by 8 pin output low level signals, and the first integrated chip IC1 closes, the current circuit of light-emitting diode led is cut off, and street lamp quits work;
Temperature sensitive resister Rt among the temperature control detection module f detects the lamp housing temperature of LED street lamp, when temperature value surpasses set point, send pwm pulse signal to the first integrated chip IC1 of constant flow module b by main control module e, can change the 5 pin output currents of the first integrated chip IC1, and then realize adjusting to LED street lamp temperature, prevent excess Temperature and damage the LED street lamp.
In the present embodiment, control the startup of LED street lamp and close by light-operated detection module f, reach the purpose of energy saving, in addition, lamp housing at the LED street lamp is provided with temperature sensitive resister Rt, can detect by temperature control detection module g the temperature of LED bulb, thereby regulate the operating current of LED street lamp, burn out the LED lamp to prevent excess Temperature.In addition; each light-emitting diode two ends at led module are provided with the LED protector; when a light-emitting diode led damages; the LED protector can play the effect of voltage stabilizing; avoid damaging the disconnection that causes whole series circuit because of indivedual light-emitting diode led; guarantee the normal use of all the other light-emitting diodes, prolonged the useful life of street lamp.
Claims (9)
1. the operating circuit of a LED street lamp includes
Switch power module (a) is converted to direct current output with the alternating current of inputting;
Led module (c), a plurality of light-emitting diodes (led) with mutual series connection, and, one end of described series connection light-emitting diode is the anode input (c+) of this led module, and the other end of described series connection light-emitting diode is the negative electrode input (c-) of this led module;
Constant flow module (b) carries out filtering and realizes power supply to described led module (c) described direct current;
Voltage reduction module (d) includes dc output end (d1), and this voltage reduction module is realized the direct current through described switch power module conversion is carried out again step-down; And
Main control module (e), in order to the conducting of controlling described constant flow module (b) with close, the power input (e1) of this main control module (e) and the dc output end (d1) of described voltage reduction module (d) link to each other;
Also include a light-operated detection module (f), the variation of surround lighting is converted to the signal of telecommunication and controls the conducting of described constant flow module (b) through described main control module (e) and close, this light-operated detection module (f) includes first signal output (f1), and, described main control module (e) includes first input end (e2) and control end (e3), described constant flow module (b) includes a trigger end (b1), wherein, the first signal output (f1) of described light-operated detection module (f) and the first input end (e2) of described main control module (e) link to each other, and the control end (e3) of this main control module (e) and the trigger end (b1) of described constant flow module (b) link to each other;
It is characterized in that: described constant flow module (b) comprises the first integrated chip (IC1) with 8 pins, also include the first diode (D1), the first electrochemical capacitor (C1), the second electric capacity (C2), the first resistance (R1), the second resistance (R2), the 3rd resistance (R3) and inductance (L), wherein, the positive pole one tunnel of described the first electrochemical capacitor (C1) links to each other with the output of described switch power module (a), another road links to each other with the negative electrode of described the first diode (D1), the minus earth of described the first electrochemical capacitor (C1), the anode one tunnel of described the first diode (D1) links to each other with 5 pin of described the first integrated chip (IC1), another road links to each other through the negative electrode input (c-) of described inductance (L) and described led module (c), and, 5 pin of this first integrated chip (IC1) and 6 pin connect altogether and are a bit, the anode input (c+) of 1 pin of this first integrated chip (IC1) and described led module (c) links to each other, 2 pin of this first integrated chip (IC1) link to each other with the positive pole of described the first electrochemical capacitor (C1), also be parallel with described the first resistance (R1) between 1 pin of described the first integrated chip (IC1) and 2 pin, 3 pin and 4 pin of described the first integrated chip (IC1) connect rear ground connection altogether, 8 pin one tunnel of this first integrated chip (IC1) are through described the 3rd resistance (R3) ground connection, another road is through described the second electric capacity (C2) ground connection, and 7 pin of this first integrated chip (IC1) link to each other as the trigger end (b1) of this constant flow module (b) and the control end (e3) of described main control module (e) through described the second resistance (R2).
2. the operating circuit of LED street lamp according to claim 1, it is characterized in that: also include a temperature control detection module (g), the heating temp of the light-emitting diode (led) in the described led module (c) is converted to the signal of telecommunication, and the size of current that this signal of telecommunication is regulated described constant flow module (b) through described main control module (e), wherein, described temperature control detection module (g) includes secondary signal output (g1), correspondingly, described main control module (e) includes the second input (e4), and the secondary signal output (g1) of described temperature control detection module (g) links to each other with second input (e4) of described main control module (e).
3. the operating circuit of LED street lamp according to claim 2, it is characterized in that: described temperature control detection module (g) includes the 6th resistance (R6) and is close to the temperature sensitive resister (Rt) that described light-emitting diode (led) arranges, wherein, the dc output end (d1) of one end of described the 6th resistance (R6) and described voltage reduction module (d) links to each other, the other end one tunnel of the 6th resistance (R6) is through described temperature sensitive resister (Rt) ground connection, and another road links to each other as the secondary signal output (g1) of this temperature control detection module (g) and second input (e4) of described main control module (e).
4. the operating circuit of LED street lamp according to claim 3, it is characterized in that: described light-operated detection module (f) includes the 7th resistance (R7) and photo resistance (Re), wherein, the dc output end (d1) of one end of described the 7th resistance (R7) and described voltage reduction module (d) links to each other, the other end one tunnel of the 7th resistance (R7) is through described photo resistance (Re) ground connection, and another road links to each other as the first signal output (f1) of this light-operated detection module (f) and the first input end (e2) of described main control module (e).
5. the operating circuit of LED street lamp according to claim 4, it is characterized in that: described voltage reduction module (d) is take the first three terminal regulator (IC3) and the second three terminal regulator (IC4) as core, also include the second diode (D2), the 3rd electric capacity (C3), the 3rd diode (D3), the 4th electric capacity (C4), the 5th electric capacity (C5) and the 4th resistance (R4), wherein, the anode of described the second diode (D2) links to each other with the output of described switch power module (a), the negative electrode one tunnel of this second diode (D2) is through described the 3rd electric capacity (C3) ground connection, the input (m1) of another road and described the first three terminal regulator (IC3) links to each other, the earth terminal (m3) of this first three terminal regulator (IC3) is ground connection directly, output (m2) a tunnel of this first three terminal regulator (IC3) links to each other with the anode of described the 3rd diode (D3), another Lu Jingdi four electric capacity (IC4) ground connection, the negative electrode of described the 3rd diode (D3) links to each other through the input (n1) of the 4th resistance (R4) and the second three terminal regulator (IC4), the earth terminal (n3) of this second three terminal regulator (IC4) is ground connection directly, the output (n2) one tunnel of this second three terminal regulator (IC4) is through the 5th electric capacity (C5) ground connection, and another road links to each other as the dc output end (d1) of whole voltage reduction module (d) and the power input (e1) of described main control module (e).
6. the operating circuit of LED street lamp according to claim 4, it is characterized in that: described main control module (e) comprises the second integrated chip (IC2) with 14 pins, also include the 4th diode (D4), the 5th resistance (R5) and the 6th electric capacity (C6), the 4 pin first via of described the second integrated chip (IC2) link to each other through the dc output end (d1) of described the 5th resistance (R5) and described voltage reduction module (d), the second the tunnel through described the 6th electric capacity (C6) ground connection, Third Road links to each other with the anode of described the 4th diode (D4), the dc output end (d1) of the negative electrode of the 4th diode (D4) and described voltage reduction module (d) links to each other, the direct ground connection of 5 pin of described the second integrated chip (IC2), the dc output end (d1) of the direct and described voltage reduction modules of 10 pin of this second integrated chip (IC2) (d) links to each other, 8 pin of this second integrated chip (IC2) link to each other as the control end (e3) of this main control module (e) and the trigger end (b1) of described constant flow module (b), 14 pin of this second integrated chip (IC2) are through described photo resistance (Re) ground connection, and 13 pin of this second integrated chip (IC2) are through described temperature sensitive resister (Rt) ground connection.
7. the operating circuit of LED street lamp according to claim 1; it is characterized in that: described led module (c) also is parallel with respectively a LED protector (h) at the two ends of each light-emitting diode (led), to realize the overcurrent protection to the series connection light-emitting diode of this led module.
8. the operating circuit of LED street lamp according to claim 7; it is characterized in that: described LED protector (h) is a voltage-stabiliser tube (D); the negative electrode of this voltage-stabiliser tube (D) links to each other with the anode of the light-emitting diode (led) of correspondence, and the anode of this voltage-stabiliser tube (D) links to each other with the negative electrode of the light-emitting diode (led) of correspondence.
9. the operating circuit of LED street lamp according to claim 7; it is characterized in that: described LED protector (h) includes controllable silicon (T) and model is the control circuit (IC5) of NUD4007; this control circuit (IC5) is connected in parallel on control end (K) and the anode two ends of described controllable silicon (T); and; the anode of described controllable silicon (T) links to each other with the anode of corresponding light-emitting diode (led), and the negative electrode of this controllable silicon (T) links to each other with the negative electrode of corresponding light-emitting diode (led).
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| CN2009101012965A CN101600275B (en) | 2009-07-27 | 2009-07-27 | Working circuit of LED streetlamp |
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| CN2009101012965A CN101600275B (en) | 2009-07-27 | 2009-07-27 | Working circuit of LED streetlamp |
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| CN101600275B true CN101600275B (en) | 2013-03-20 |
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