CN203057635U

CN203057635U - Energy-saving multi-path adjustable LED street lamp constant-current driving power supply

Info

Publication number: CN203057635U
Application number: CN2013200089586U
Authority: CN
Inventors: 李智; 王强
Original assignee: SICHUAN CHUANGJING TECHNOLOGY Co Ltd
Current assignee: SICHUAN CHUANGJING TECHNOLOGY Co Ltd
Priority date: 2013-01-09
Filing date: 2013-01-09
Publication date: 2013-07-10
Anticipated expiration: 2023-01-09

Abstract

The utility model discloses an energy-saving multi-path adjustable LED street lamp constant-current driving power supply. The driving power supply is composed of the following components: a power input end, a reverse connection prevention circuit, a voltage stabilization circuit, a DC-DC conversion circuit, a single-chip microcomputer control circuit, a detection circuit and a feedback circuit. The power input end, the reverse connection prevention circuit and the DC-DC conversion circuit are successively connected in series. The output end of the DC-DC conversion circuit is connected with an LED street lamp load for providing constant-current power supply. The reverse connection prevention circuit outputs +5V voltage. The detection circuit acquires an environment signal and transmits to the single-chip microcomputer control circuit for processing. The feedback circuit transmits the feedback signal of the load to the single-chip microcomputer control circuit. The single-chip microcomputer control circuit comprehensively processes the acquired information and outputs a signal for controlling the DC-DC conversion circuit. The energy-saving multi-path adjustable LED street lamp constant-current driving power supply has the following advantages: simple circuit, capability of realizing multi-path output, small ripple of the output current, capability of adjusting amount of load current in real-time, energy-saving performance, prolonged service life, etc. A relational expression between the output voltage and the output voltage is derivated according to the structure of the DC-DC conversion circuit.

Description

The LED street lamp constant-current driving power supply that a kind of energy-saving multichannel is adjustable

Technical field

The utility model belongs to semiconductor lighting control technology field, particularly the adjustable LED street lamp constant-current driving power supply of a kind of energy-saving multichannel.

Background technology

In the road traffic illuminator, adopt the luminous efficiency height, low in energy consumption, the life-span is long, safe and reliable LED street lamp becomes the important behave of building a conservation-minded society in recent years, has vast potential for future development.Because the LED street lamp is operated in complicated outdoor environment, therefore its driving power there is very high Performance And Reliability requirement, but all there is defective in the driving power of LED street lamp at present, become its bottleneck of applying of restriction, first is that present LED streetlamp driving power supply still exists energy conversion efficiency low low with power output, waste a large amount of electric energy, and output current ripple is big, poor stability has had a strong impact on life-span of LED street lamp; Second is that present road traffic illuminator is leaned on manual maintenance mostly, and intelligentized degree is very low, has caused the significant wastage of human resources, and can not control according to the real-time light that carries out of current traffic, has also wasted much electricity; Thirdly be complex structure mostly in the current driving power, used a lot of devices, increased cost, also reduced the reliability of system.At the defective that current LED street lamp exists, the utility model is designed a kind of low cost, reliability height, multichannel output, energy conversion rate is high and intelligentized economizing type LED streetlamp driving power supply.

The utility model content

The utility model improves the conversion efficiency of LED streetlamp driving power supply, and makes outputting current steadily good by changing DC-DC translation circuit structure, has prolonged the life-span of LED street lamp; Detect by light intensity, it is intelligent that vehicle detection realizes driving power, and power supply changes the bright dark degree of regulating the LED street lamp automatically according to current traffic and ambient light, thereby saves a large amount of electric energy; By temperature sensing circuit, regulate the electric current output size of driving power, can avoid the LED street lamp to burn because temperature rise is too high.

For achieving the above object, the utility model adopts following scheme: this LED streetlamp driving power supply is made up of external power input, reverse-connection preventing circuit, voltage stabilizing circuit, DC-DC translation circuit, single chip machine controlling circuit, detection circuit, feedback circuit.Wherein detection circuit comprises temperature sensing circuit, light intensity testing circuit and vehicle detection circuit.External power (solar panel) is received reverse-connection preventing circuit; the effect of reverse-connection preventing circuit is: the both positive and negative polarity that prevents the wrong power supply; circuit can not worked if the both positive and negative polarity of power supply has connect instead, can't cause late-class circuit to burn, and plays the effect of protective circuit element.Reverse-connection preventing circuit output is divided into two-way, and one the tunnel connects voltage stabilizing circuit, exports stable+5V voltage, is single-chip microcomputer, operational amplifier and the power supply of each transducer; The input of DC-DC translation circuit is received on another road, and the PWM conditioning signal of single-chip microcomputer output also acts in the DC-DC translation circuit, DC-DC translation circuit output connects load LED street lamp, and real-time output meets constant voltage and the electric current of traffic and environmental quality at that time.And the PWM conditioning signal of single-chip microcomputer output is the temperature height according to current LED street lamp, this moment environment light intensity magnitude and road on what of vehicle comprehensively judge, thereby export real-time control signal.

Comprised the DC-AC translation circuit in the above-mentioned DC-DC translation circuit, the multichannel circuit of synchronous rectification, multiplex output circuit, be example with one road circuit of synchronous rectification and No. one output circuit now, circuit of synchronous rectification substitutes the rectifier diode of outlet side by the MOSFET that uses low on-state resistance, and the driving signal of MOSFET is from the output voltage of auxiliary winding, for different power MOSFET tubes, driving voltage may have larger difference, because the number of turn of auxiliary winding can design according to the needs of output voltage, can effectively drive the power MOSFET tube of different conducting threshold voltages.The purpose of this synchronous rectification is to reduce the rectification power consumption to greatest extent, improves delivery efficiency.

Above mention the real-time PWM conditioning signal of single chip machine controlling circuit output, the influence of the factors such as temperature of output-controlled light intensity in environment, road vehicle and the LED street lamp of its dim signal, single-chip microcomputer is constantly gathered, is analyzed, comprehensively by data, export control signal in real time, to the full extent the safety of saves energy and assurance LED street lamp.Inductance coil signal in vehicle detection is sent to single-chip microcomputer, does not have the vehicle process if judge, and the single-chip microcomputer output pwm signal is closed the LED street lamp; If judged the vehicle process, then also need to judge temperature height and the environmental light intensity size of current LED street lamp, when LED street lamp temperature a little less than the not high and environmental light intensity, single-chip microcomputer output pwm signal unlatching LED street lamp then; When temperature than higher, when beam intensity ratio was more weak, single-chip microcomputer was according to the temperature level that collects and light intensity magnitude graduation output, light intensity aspect: if light intensity intensity is at 50lux-100lux; The pwm control signal output current is 1/2nd of running current, if light intensity is at 20lux-50lux; Output current is 3/4ths of running current, if light intensity is lower than 20lux, and the specified output of electric current.The temperature aspect: the temperature of LED street lamp is higher than 85 ℃, and output current reduces by half, and 75 ℃-85 ℃, output current is 3/4ths, 65 ℃-75 ℃, and output current is 5/6ths, is lower than 65 ℃, rated current output.

The beneficial effects of the utility model are: at first be that it has adopted the higher circuit structure of conversion efficiency, make that LED street lamp capacity usage ratio is higher, environmental protection and energy-conservation more; Secondly the more stable DC-DC mapped structure of output current makes the life-span of LED street lamp prolong; Moreover be that the DC-DC mapped structure is simple, make cost lower, be easy to promote widely; Be that intelligence is regulated electric current output at last, export the driving power signal that meets when precondition according to real-time traffic, thus the reasonable use electric energy, and saves energy is for building a conservation-minded society and stepping further.

Description of drawings

Fig. 1 is the whole mechanism block diagram of a kind of energy-saving multichannel adjustable LED streetlamp driving power supply of the utility model

Fig. 2 is the utility model reverse-connection preventing circuit schematic diagram

Fig. 3 is the utility model voltage stabilizing circuit schematic diagram

Fig. 4 is the utility model light intensity testing circuit schematic diagram

Fig. 5 is the utility model temperature sensing circuit schematic diagram

Fig. 6 is the utility model vehicle detecting system theory diagram

Fig. 7 is the utility model DC-DC translation circuit schematic diagram

Fig. 8 is the utility model feedback circuit schematic diagram

Fig. 9 is the utility model single chip machine controlling circuit schematic diagram

Embodiment

Be described further below in conjunction with the utility model of figure.

As shown in Figure 1, the utility model is a kind of energy-saving multichannel adjustable LED streetlamp driving power supply, comprises power input, reverse-connection preventing circuit, voltage stabilizing circuit, DC-DC translation circuit, single chip machine controlling circuit, detection circuit, feedback circuit.Wherein detection circuit comprises temperature sensing circuit, light intensity testing circuit and vehicle detection circuit.External dc power (solar panel) is received the input reverse-connection preventing circuit; the effect of reverse-connection preventing circuit is: the both positive and negative polarity that prevents the wrong power supply; circuit can not worked if the both positive and negative polarity of power supply has connect instead, can't cause late-class circuit to burn, and plays the effect of protective circuit element.Reverse-connection preventing circuit output is divided into two-way, and one the tunnel connects voltage stabilizing circuit, exports stable+5V voltage, is single-chip microcomputer, operational amplifier and the power supply of each transducer of control system; The input of DC-DC translation circuit is received on another road, and the PWM conditioning signal of single-chip microcomputer output also acts in the DC-DC translation circuit, DC-DC translation circuit output connects load LED street lamp, and real-time output meets constant voltage and the electric current of traffic and environmental quality at that time.Wherein the PWM conditioning signal of single-chip microcomputer output is the temperature height according to current LED street lamp, this moment environment light intensity magnitude and road on what of vehicle comprehensively judge, thereby export real-time control signal.

Be the specific implementation circuit of reverse-connection preventing circuit as Fig. 2, this circuit mainly is made up of P type metal-oxide-semiconductor Q1, R1, R2, R3, C1, C3 and D1.R1 and C1 are buffer circuits, prevent that the powered on moment overtension from causing Q1 to damage; D1 is voltage-stabiliser tube, prevents that source voltage is excessive, burns the MOSFET pipe.When input voltage was normal, the at first conducting of body diode of P channel MOS tube Q1 made that the grid voltage of Q1 is lower, Q1 conducting, load operate as normal; When the input voltage reversal connection, the body diode reverse of P channel MOS tube Q1 is ended, and the grid voltage of Q1 is higher, and metal-oxide-semiconductor Q1 ends, and does not have electric current to flow through in the circuit, has prevented that the load of back level from damaging because of the input voltage reversal connection.

Be voltage stabilizing circuit as Fig. 3, circuit is that core is formed by low-power consumption three terminal regulator LM7805 mainly, and input is taken over control the output of reverse-connection protection circuit, exports stable+5V voltage, is single-chip microcomputer, amplifier and the power supply of each transducer of control system.

Being the light intensity testing circuit as Fig. 4, is core by U5 visible light sensor GB5-A3C, and R4 is that peripheral components is formed.U4 is that a kind of environmental light intensity cheaply changes and the output current visible light sensor that is directly proportional, and has not to be subjected to ultrared interference, and dark current is very little, and operating temperature range is wide, characteristics such as temperature influence hardly in operating temperature range.The pin 3 of U5 constitutes the aanalogvoltage output by resistance R 4 ground connection, and this voltage is according to the power of environmental light intensity and positive specific output, and single-chip microcomputer collects the value of this voltage in real time in the control system, for the output dim signal provides foundation.

Be temperature sensing circuit as Fig. 5, ADT7311 is core devices by U7 high accuracy number temperature sensor, and peripheral components R18, R19 and C9 form, the 8th pin of U7 connects+5V, the 7th pin ground connection, and the R18 two ends connect respectively+the 6th pin of 5V and U7, the R19 two ends connect respectively+the 5th pin of 5V and U7, and U7 the 1st, 2,3,4,5,6 pins are the single-chip microcomputer P2.1 of connected control system respectively, P2.2, P2.3, P2.4, P2.5, P2.6 pin.The built-in band gap temperature reference source of U7 and 16 ADC are used for monitoring temperature and carry out numeral conversion, and resolution is 0.0078 ℃, with the temperature of LED street lamp real-time send single-chip microcomputer to, for single-chip microcomputer output dim signal provides foundation.

Be the vehicle detection circuit as Fig. 6, this circuit mainly is made up of wire loop, resonant tank, constant-current supply, phase place lock, phase comparator, output amplifier, digital signal module.The concrete course of work is: be embedded in underground coil and be connected to the resonant tank of being supported by constant-current source by transformer, and the space around coil generates an electromagnetic field.When advancing people's coil magnetic field scope, produce the induced electricity eddy current in self-closing loop in the vehicle iron member, this eddy current produces the new magnetic field opposite with original magnetic direction again, cause the total inductance of coil to diminish, cause that tuned frequency departs from the frequency that original numerical value ` departs from and is sent to phase comparator, compare with pressuring controlling oscillator frequency, confirm its deviation value, thereby send the signal that vehicle passes through or exists.This signal is sent to single-chip microcomputer and provides foundation for the output light modulation.

Be the DC-DC translation circuit as Fig. 7, mainly by inductance core L1, L2, power MOSFET tube Q2, Q3, transformer T1, voltage-stabiliser tube D2, D6, diode D3, capacitor C 5, C7 form.The DC-DC translation circuit is divided into two parts, first is by transformer T1, inductance core L1, L2, capacitor C 5, C6, C7, power MOSFET tube Q3, sustained diode 3 is formed, this part realizes the conversion of energy, the course of work is as follows: when power MOSFET tube Q3 conducting, external input voltage U1 is by L1 ground connection, so L1 charging this moment, the voltage of capacitor C 6 is added on the primary coil of transformer T1, C1 begins discharge, the electric current that secondary coil induces is powered to load, this moment, C5 and C6 were discharge conditions, and the electric current of C5 is to load power supply and power supply sense magnetic core L2 energy storage in the secondary coil, and sustained diode 3 is instead ended partially; When power MOSFET tube by the time, inductance L 1 releases energy, capacitor C 6 charging energy storage, primary current changes to be made secondary coil sense electric current C5 is charged, load current flows through from sustained diode 3, inductance core L2 discharges energy storage to load discharge.This circuit has following characteristics as can be seen: at first be that components and parts are few, control structure is simple; Next is no matter power MOSFET tube Q3 is conducting or ends, and all can transmit energy to secondary coil from the primary coil of transformer T1, and supply load is so efficient is very high; The primary and secondary coil that is transformer T1 does not at last all have direct current to pass through, and its magnetic core does not need to add air gap, does not therefore have the saturated problem of magnetic core.Second portion is made up of power MOSFET tube Q2, voltage-stabiliser tube D2, D6 and resistance R 5, this part realizes synchronous rectification, synchronous rectification substitutes the rectifier diode of outlet side by the MOSFET pipe Q2 that uses low on-state resistance, and the driving signal of Q2 is from the voltage of the secondary coil output of transformer T1, for different power MOSFET tubes, driving voltage may have larger difference, because the number of turn of the secondary coil of transformer T1 can design according to the needs of output voltage, can effectively drive the power MOSFET tube of different conducting threshold voltages.The purpose of this synchronous rectification is to reduce the rectification power consumption to greatest extent, improves delivery efficiency.

Be feedback circuit as Fig. 8, wherein constant voltage circuit is made up of linear optical coupling U1, pressurizer U8, amplifier U2, capacitor C 8 and resistance R 11, R12, R13, R15, R16, R17.The constant voltage principle is: U8 is the accurate pressurizer TL431 of TI company, there is the reference voltage of a 2.5V its inside, 1, this pressurizer is regulated the numerical value of output voltage U 0 by regulating the voltage between 2 pin, make the branch pressure voltage of R12 and R15, be the 3 pin voltages of U8, remain on 2.5V, thereby reach the purpose of regulated output voltage, transmission of electricity presses the numerical value of U0 just to be decided by R12 and R15.The transformer T1 of linear optical coupling U1 primary and secondary coil carries out electrical isolation.The voltage stabilizing adjustment process is as follows: when U0 fluctuates, for example less than normal, R12 and R15 reduce dividing potential drop, the internal regulation mechanism of U8 can improve 1, the voltage between 2 pin, voltage on first pin of U1 raises, and the trend to stop U0 to reduce can make former side's electric current of optocoupler U1 reduce like this, the square electric current of its pair reduces thereupon, and the voltage on the R16 also can reduce.Operational amplifier shown in the figure is the error amplifier of PWM controller inside, voltage on the R16 reduces to make the output of error amplifier to increase, this changing value is sent in the control system single-chip microcomputer handles, thereby increase the pulsewidth of PWM ripple, the increase of pulsewidth will make U0 increase, and plays the effect of stable output.R14, R17 and C8 are used for the regulating error Amplifier Gain, and the feedback network that their constitute has very big influence to the response characteristic of output voltage and the regulating characteristics of control section.

Constant-current circuit is made up of R6, R7, R8, R9, R10 and amplifier U3.Circuit structure is: the negative pole of load LED lamp passes through 0.1 ohm precision resistance R6 ground connection, receive the positive input of amplifier U3 simultaneously by R8, through resistance R 7, R9, R10 the sampled voltage on the R6 is amplified, output to the 22nd pin of single-chip microcomputer, through the single-chip microcomputer analog-to-digital conversion, analyze, computing output PWM dim signal plays the effect of constant current again.

Be single chip machine controlling circuit as Fig. 9, circuit is core by U1 single-chip microcomputer STC12C5412AD mainly, crystal oscillator AR1, capacitor C 1, C2 are that peripheral components is formed, the 28th pin of U1 meets power supply+5V, the 14th pin ground connection, the 6th of U1,7 pins are received the two ends of crystal oscillator AR1 respectively, by C2, C4 is ground connection respectively, single-chip microcomputer the 26th pin output pwm control signal.The course of work of single chip machine controlling circuit is as follows: single-chip microcomputer is constantly gathered, is analyzed, comprehensively by data, exports control signal in real time, to the full extent saves energy and guarantee the safety of LED street lamp.Inductance coil signal in vehicle detection is sent to single-chip microcomputer, does not have the vehicle process if judge, and the single-chip microcomputer output pwm signal is closed the LED street lamp; If judged the vehicle process, then also need to judge temperature height and the environmental light intensity size of current LED street lamp, when LED street lamp temperature a little less than the not high and environmental light intensity, single-chip microcomputer output pwm signal unlatching LED street lamp then; When temperature than higher, when beam intensity ratio was more weak, single-chip microcomputer was according to the temperature level that collects and light intensity magnitude graduation output, light intensity aspect: if light intensity intensity is at 50lux-100lux; The pwm control signal output current is 1/2nd of running current, if light intensity is at 20lux-50lux; Output current is 3/4ths of running current, if light intensity is lower than 20lux, and the specified output of electric current.The temperature aspect: the temperature of LED street lamp is higher than 85 ℃, and output current reduces by half, and 75 ℃-85 ℃, output current is 3/4ths, 65 ℃-75 ℃, and output current is 5/6ths, is lower than 65 ℃, rated current output.

Claims

1. LED street lamp constant-current driving power supply that energy-saving multichannel is adjustable, comprise power input, reverse-connection preventing circuit, voltage stabilizing circuit, DC-DC translation circuit, single chip machine controlling circuit, detection circuit, feedback circuit, it is characterized in that: power input, reverse-connection preventing circuit, DC-DC translation circuit are connected in series successively, and the output of DC-DC translation circuit connects the load of LED street lamp provides the constant current power supply; Voltage stabilizing circuit is received in reverse-connection preventing circuit output simultaneously, and voltage stabilizing circuit is output as single-chip microcomputer, operational amplifier, temperature sensor, inductance coil, light sensor power supply; Constant current constant voltage feedback circuit and detection circuit parallel connection, output is connected to the single chip machine controlling circuit input separately, detection circuit has or not the signal of situation to pass to the single chip machine controlling circuit calculation process on temperature, light intensity, the vehicle that collects, and the constant current constant voltage feedback circuit is passed to the single-chip computer control system circuit in real time with the electric current and voltage situation of load; The single chip machine controlling circuit output connects DC-DC translation circuit input, single chip machine controlling circuit is according to the pwm signal of the information output light modulation of current acquisition, described DC-DC translation circuit comprises DC-AC translation circuit, multichannel circuit of synchronous rectification, multiplex output circuit, also according to DC-DC translation circuit mapped structure, derive the relational expression of input voltage and output voltage, detection circuit comprises light intensity testing circuit, temperature sensing circuit, vehicle detection circuit.

2. the adjustable LED street lamp constant-current driving power supply of a kind of energy-saving multichannel according to claim 1, it is characterized in that: described reverse-connection preventing circuit comprises P type MOSFET pipe Q1, resistance R 1, R2, R3, capacitor C 1, C3 and diode D1 form, power input is received in the drain electrode of MOSFET pipe Q1, be connected in parallel on drain electrode and the source electrode two ends of MOSFET pipe Q1 after resistance R 1 and capacitor C 1 series connection together, resistance R 2, diode D1 and capacitor C 3 are connected in parallel between the grid and source electrode of MOSFET pipe Q1 together, resistance R 3 is connected between MOSFET pipe Q1 grid and the ground, and the source electrode of MOSFET pipe Q1 is voltage output end.

3. the adjustable LED street lamp constant-current driving power supply of a kind of energy-saving multichannel according to claim 1, it is characterized in that: described detection circuit comprises light intensity testing circuit, temperature sensing circuit, the light intensity testing circuit is made up of visible light sensor GB5-A3C, resistance R 4, second pin of visible light sensor GB5-A3C connects+5V, the 3rd pin of visible light sensor GB5-A3C is by resistance R 4 ground connection, the 4th pin ground connection of visible light sensor GB5-A3C; Temperature sensing circuit is by high accuracy number temperature sensor ADT7311, resistance R 18, R19 and capacitor C 9 are formed, first pin of ADT7311, second pin, the 3rd pin, the 4th pin, the 5th pin, the 6th pin connects the 27 pin of single-chip microcomputer STC12C5412AD respectively, first pin, second pin, the 13 pin, the 15 pin, the 16 pin, R18 one termination+5V, the 6th pin of one termination ADT7311, R19 one termination+5V, the 5th pin of a termination ADT7311, the 7th pin ground connection of ADT7311, the 8th pin of ADT7311 connects+5V, simultaneously by capacitor C 9 ground connection.

4. the adjustable LED street lamp constant-current driving power supply of a kind of energy-saving multichannel according to claim 1, it is characterized in that: described DC-DC translation circuit comprises the DC-AC translation circuit, the multichannel circuit of synchronous rectification, multiplex output circuit, now describe with one tunnel multichannel circuit of synchronous rectification and No. one output circuit, this circuit is by inductance core L1, L2, power MOSFET tube Q2, Q3, transformer T1, voltage-stabiliser tube D2, D6, diode D3, capacitor C 5, C7 forms, wherein transformer T1 comprises a primary coil, two secondary coils, be called the T1 primary coil respectively, T1 secondary coil 1 and T1 secondary coil 2, inductance core L1 termination reverse-connection preventing circuit of the same name output, the different name end is by capacitor C 6 ground connection, connect power MOSFET tube Q3 drain electrode simultaneously, the grid of power MOSFET tube Q3 connects the single-chip computer control system circuit output end, the source ground of power MOSFET tube Q3, voltage-stabiliser tube D2, the D6 series connection is connected in parallel on T1 secondary coil 2 two ends with resistance R 5, T1 secondary coil 2 ends of the same name are connected to the grid of power MOSFET tube Q2, T1 secondary coil 2 different name ends are connected the drain electrode of MOSFET pipe Q2, the source electrode of MOSFET pipe Q2 connects the different name end of T1 secondary coil 1, the end of the same name of capacitor C 5 one termination T1 secondary coils 1, the drain electrode of another termination MOSFET pipe Q2, the anode of diode D3 and negative terminal connect drain electrode and the source electrode two ends of MOSFET pipe Q2 respectively, diode D3 anode is by inductance core L2 ground connection, the negative terminal of diode D3 is by capacitor C 7 ground connection, and the negative terminal of diode D3 is output.