CN110049599B - Constant-current LED intelligent control street lamp based on ambient light brightness conversion - Google Patents
Constant-current LED intelligent control street lamp based on ambient light brightness conversion Download PDFInfo
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- CN110049599B CN110049599B CN201910418814.XA CN201910418814A CN110049599B CN 110049599 B CN110049599 B CN 110049599B CN 201910418814 A CN201910418814 A CN 201910418814A CN 110049599 B CN110049599 B CN 110049599B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/54—Cooling arrangements using thermoelectric means, e.g. Peltier elements
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention provides a constant-current LED intelligent control street lamp based on ambient light brightness conversion, which is characterized in that: the LED driving circuit at least comprises an LED array, an LED control circuit and a constant current circuit; the LED control circuit is used for detecting the ambient light of the environment where the LED array is positioned and controlling the on-off between the LED array and the power supply according to the ambient light; the constant current circuit is used for detecting the working current of the LED array, controlling the working current of the LED array to be in a set working current, detecting ambient light through the LED control circuit, and intelligently turning on or off the street lamp according to a preset ambient light threshold.
Description
Technical Field
The invention relates to the field of intelligent control, in particular to a constant-current LED intelligent control street lamp based on ambient light brightness conversion.
Background
The LED lamp has the characteristics of small volume, light weight, good directivity, long energy-saving service life and the like, is widely applied to urban illumination, but the on/off of the existing urban street lamp is still in a mode of being opened or closed for a fixed time, and in the mode, the street lamp is often found to be opened when the street lamp is still very bright in summer, the illumination function is not realized while the electric energy is consumed, and the waste of electric power resources is caused; in winter, the street lamp is completely black, and the street lamp is not started yet, so that inconvenience is caused to pedestrians and vehicles in going out, therefore, the mode of starting or stopping the street lamp at fixed time completely does not take into consideration the natural law that the daytime time changes along with the season change, and of course, the switching time of the street lamp can be adjusted according to the season change, but the requirement on manpower is high in real time adjustment; in addition, the LED lamp is greatly influenced by temperature and has high heat dissipation requirement, but the heat dissipation performance of the existing LED street lamp cannot meet the heat dissipation requirement of the LED street lamp.
Therefore, there is a need for an LED street lamp with long service life, which can control the LED street lamp to be turned on or off according to the brightness of light.
Disclosure of Invention
In view of the above, the invention provides a constant-current LED intelligent control street lamp based on ambient light brightness conversion, which realizes the detection of ambient light through an LED control circuit and the intelligent opening or closing of the street lamp according to a preset ambient light threshold.
The invention provides a constant-current LED intelligent control street lamp based on ambient light brightness conversion, which is characterized in that: the LED driving circuit at least comprises an LED array, an LED control circuit and a constant current circuit;
the input end of the LED array is connected with a power supply, and emits light when the LED array is electrified;
the power supply end of the constant current circuit is connected with the power supply and is used for detecting the working current of the LED array and controlling the working current of the LED array to be in a set threshold range according to the change of the working current of the LED array;
the LED control circuit is used for detecting the ambient light of the environment where the LED array is located and controlling the on-off between the input end of the LED array and the power end and the power supply of the constant current circuit according to the ambient light.
Further, the constant current circuit includes: the adjustable resistor R10, the resistor R11, the resistor R12, the operational amplifier U3 and the MOS tube Q4;
one end of an adjustable resistor R10 is connected with a power supply, the other end of the adjustable resistor R10 is connected with the same-phase end of an operational amplifier U3, the output end of the operational amplifier U3 is connected with the grid electrode of a MOS tube Q4 through a resistor R11, the drain electrode of the MOS tube Q4 is connected with the negative electrode of the LED array, the drain electrode of the MOS tube Q4 is grounded through a resistor R12, the opposite-phase end of the operational amplifier U3 is connected with the common connection point of the drain electrode of the MOS tube Q4 and the resistor R12,
wherein, MOS pipe Q4 is N ditch enhancement mode MOS pipes.
Further, the LED control circuit includes: the resistor R5, the adjustable resistor R6, the resistor R7, the resistor R8, the resistor R9, the photoresistor PR, the operational amplifier U2, the triode Q3 and the relay JD1;
one end of a resistor R5 is connected with the output end of the voltage stabilizing circuit, the other end of the resistor R5 is grounded through an adjustable resistor R6, one end of a resistor R7 is connected with the output end of the voltage stabilizing circuit, the other end of the resistor R7 is grounded through a photoresistor PR, the inverting end of an operational amplifier U2 is connected with the common connection point of the resistor R5 and the adjustable resistor R6, the non-inverting end of the operational amplifier U2 is connected with the common connection point of the resistor R7 and the photoresistor PR, the output end of the operational amplifier U2 is connected with the base electrode of a triode Q3 through a resistor R8, the collector electrode of the triode Q3 is connected with the output end of the voltage stabilizing circuit, the emitter electrode of the triode Q3 is connected with one end of a coil of a relay JD1, the other end of the coil of the relay JD1 is grounded, a switch of the relay JD1 is arranged between a power supply and the power supply end of the constant current circuit,
the triode Q3 is an NPN triode, and the relay JD1 is a normally open relay.
Further, the power supply includes: the voltage-reducing rectifying circuit is characterized by comprising a voltage-reducing rectifying circuit, an overvoltage protection circuit and a voltage stabilizing circuit, wherein the input end of the voltage-reducing rectifying circuit is connected with a mains supply, the output end of the voltage-reducing rectifying circuit is connected with the input end of the overvoltage protection circuit, the output end of the overvoltage protection circuit is connected with the input end of the voltage stabilizing circuit, and the voltage stabilizing circuit outputs constant working voltage.
Further, the overvoltage protection circuit comprises a fuse F1, a piezoresistor RV, an adjustable resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a triode Q1 and a triode Q2;
one end of a fuse F1 is connected with the output end of a buck rectifying circuit, the other end of the fuse F1 is connected with the collector of a triode Q1 through an adjustable resistor R1, one end of a resistor R2 is connected with the public connection point of the collector of the adjustable resistor R1 and a triode Q1, the other end of the resistor R2 is grounded through a resistor R3, the base of the triode Q1 is connected with the public connection point of the resistor R2 and the resistor R3, the emitter of the triode Q1 is connected with a voltage stabilizing circuit, one end of a piezoresistor RV is connected with the public connection point of the fuse F1 and the adjustable resistor R1, the other end of the piezoresistor RV is grounded through a resistor R4, the base of the triode Q2 is connected with the public connection point of the piezoresistor RV and the resistor R4 through a resistor R5, the collector of the triode Q2 is connected with the base of the triode Q1, and the emitter of the triode Q2 is grounded.
Further, the heat dissipation device and the heat dissipation control circuit are also included,
the input end of the heat dissipation device is connected with a power supply, and heat is dissipated when the power is on;
and the heat dissipation control circuit is used for detecting the ambient temperature inside the street lamp and controlling the on-off between the heat dissipation device and the power supply according to the ambient temperature.
Further, the heat dissipation control circuit comprises a resistor R13, a resistor R14, an adjustable resistor R15, a resistor R16, a resistor R17, a positive temperature coefficient thermistor PTC2, an operational amplifier U4 and a triode Q5;
one end of a resistor R13 is connected with the output end of the voltage stabilizing circuit, the other end of the resistor R13 is grounded through a positive temperature coefficient thermistor PTC2, one end of a resistor R14 is connected with the output end of the voltage stabilizing circuit, the other end of the resistor R14 is grounded through an adjustable resistor R15, the in-phase end of an operational amplifier U4 is connected with the common connection point of the resistor R13 and the positive temperature coefficient thermistor PTC2, the opposite phase end of the operational amplifier U4 is connected with the common connection point of the resistor R14 and the adjustable resistor R15, the output end of the operational amplifier U4 connects a resistor R16 with the base electrode of a triode Q5, the collector electrode of the triode Q5 is connected with the output end of the voltage stabilizing circuit through a resistor R17, the emitter electrode of the triode Q5 is connected with a heat dissipation device,
the triode Q5 is an NPN triode.
Further, the constant current circuit further includes: one end of the positive temperature coefficient thermistor PTC1 is connected with a power supply, and the other end of the positive temperature coefficient thermistor PCT1 is connected with the input end of the LED array.
Further, constant current LED intelligent control street lamp based on ambient light-shade changes still includes hollow umbrella skirt lamp stand, umbrella skirt lamp stand from last first umbrella skirt lamp stand and the second umbrella skirt lamp stand of setting gradually down, the lower extreme of first umbrella skirt lamp stand and second umbrella skirt lamp stand all is provided with hollow cylindrical spliced pole, the cylindrical upper end and the first umbrella lamp stand lower extreme of first umbrella lamp stand are connected, the cylindrical lower extreme and the upper end fixed connection of second umbrella lamp stand of first umbrella lamp stand, the inboard hollow structure that is of first umbrella lamp stand and second umbrella lamp stand communicates from top to bottom and forms the accommodation chamber, cylindrical spliced pole lateral wall all is provided with the ventilation hole.
Further, the heat dissipating device is arranged in the second umbrella skirt lamp holder, the control circuit board is arranged on the lower surface of the heat dissipating device, and the LED array is arranged on the control circuit board.
The beneficial technical effects of the invention are as follows: firstly, the LED control circuit detects the ambient light of the environment where the LED array is positioned, and controls the on-off of the LED array and the power supply according to the ambient light, so that the intelligent on-off of the street lamp is realized, and meanwhile, the problem of the street lamp in a timing switch mode is solved; secondly, the invention detects the working current of the LED array through the constant current circuit, controls the working current of the LED array to be in the set working current, inhibits the temperature increase of the LED array from the aspect of electrical characteristics, and prolongs the actual service life of the LED; finally, the heat dissipation function of the LED street lamp is enhanced by changing the heat dissipation device and the umbrella skirt lamp holder structure, and the actual service life of the LED is prolonged.
Drawings
The invention is further described below with reference to the accompanying drawings and examples:
FIG. 1 is a schematic diagram of the mechanism of the present invention.
Figure 2 is a cross-sectional view of the present invention.
Fig. 3 is a block diagram of the circuit configuration of the present invention.
Fig. 4 is a schematic diagram of an LED control circuit and a constant current circuit of the present invention.
Fig. 5 is a schematic diagram of a heat dissipation control circuit of the present invention.
Fig. 6 is a schematic diagram of a buck rectifying and overvoltage protection circuit of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings of the specification:
the invention provides a constant-current LED intelligent control street lamp based on ambient light brightness conversion, which is characterized in that: the LED driving circuit at least comprises an LED array, an LED control circuit and a constant current circuit;
the input end of the LED array is connected with a power supply, and emits light when the LED array is electrified;
the power supply end of the constant current circuit is connected with the power supply and is used for detecting the working current of the LED array and controlling the working current of the LED array to be in a set threshold range according to the change of the working current of the LED array;
the LED control circuit is used for detecting the ambient light of the environment where the LED array is located and controlling the on-off between the input end of the LED array and the power end and the power supply of the constant current circuit according to the ambient light.
The LED array consists of an LED chip, the LED chip is a typical nonlinear element, if the current of the LED is not limited, the LED chip can possibly work in a constant current area after the LED chip is directly connected with a voltage, but the resistance value of the LED chip per se is reduced along with the rising of the temperature, and under the condition that the voltage is kept unchanged, the current flowing through the LED chip is increased according to ohm law; the temperature of the LED is further increased due to the increase of the current flowing through the LED, the resistance value of the LED is further reduced, and under the condition that the voltage is kept unchanged, the current flowing through the LED is continuously increased according to ohm law, so that a vicious circle is formed, and the LED is finally burnt out.
Through the technical scheme, the street lamp can be controlled to be turned on or off according to the brightness change of the ambient light, and in addition, the working current of the LED array is in the set working current through the constant current circuit, so that the temperature increase of the LED array is restrained from the aspect of electrical characteristics, and the actual service life of the LED is prolonged.
In this embodiment, the constant current circuit includes: the adjustable resistor R10, the resistor R11, the resistor R12, the operational amplifier U3 and the MOS tube Q4;
one end of an adjustable resistor R10 is connected with a power supply, the other end of the adjustable resistor R10 is connected with the same-phase end of an operational amplifier U3, the output end of the operational amplifier U3 is connected with the grid electrode of a MOS tube Q4 through a resistor R11, the drain electrode of the MOS tube Q4 is connected with the negative electrode of the LED array, the drain electrode of the MOS tube Q4 is grounded through a resistor R12, the opposite-phase end of the operational amplifier U3 is connected with the common connection point of the drain electrode of the MOS tube Q4 and the resistor R12,
wherein, MOS pipe Q4 is N ditch enhancement mode MOS pipes.
The inverting terminal of the operational amplifier U3 is connected with the common connection point of the resistor R12 and the MOS tube Q4, so that the operational amplifier U3 is in a closed loop state, at the moment, the operational amplifier U3 works in a linear state, according to the virtual short characteristic of the operational amplifier linear state, the potential of the non-inverting terminal and the inverting terminal of the operational amplifier U3 is equal, when the current of the LED array increases along with the temperature rise, the voltage of the resistor R12 increases, namely the voltage of the inverting terminal of the operational amplifier U3 increases, the output voltage of the U3 decreases, namely the grid voltage of the MOS tube Q4 decreases, and the grid voltage controls the drain current, the drain current decreases, namely the current increase of the LED array is restrained, so that the current of the LED array is constant; the invention can change the brightness of the LED by adjusting the adjustable resistor R10.
In this embodiment, the LED control circuit includes: the resistor R5, the adjustable resistor R6, the resistor R7, the resistor R8, the resistor R9, the photoresistor PR, the operational amplifier U2, the triode Q3 and the relay JD1;
one end of a resistor R5 is connected with the output end of the voltage stabilizing circuit, the other end of the resistor R5 is grounded through an adjustable resistor R6, one end of a resistor R7 is connected with the output end of the voltage stabilizing circuit, the other end of the resistor R7 is grounded through a photoresistor PR, the inverting end of an operational amplifier U2 is connected with the common connection point of the resistor R5 and the adjustable resistor R6, the non-inverting end of the operational amplifier U2 is connected with the common connection point of the resistor R7 and the photoresistor PR, the output end of the operational amplifier U2 is connected with the base electrode of a triode Q3 through a resistor R8, the collector electrode of the triode Q3 is connected with the output end of the voltage stabilizing circuit, the emitter electrode of the triode Q3 is connected with one end of a coil of a relay JD1, the other end of the coil of the relay JD1 is grounded,
the triode Q3 is an NPN triode, and the relay JD1 is a normally open relay.
When the ambient light is gradually weakened and the resistance value of the photoresistor PR is increased along with the weakening of the ambient light, when the voltage at the two ends of the photoresistor PR is larger than the voltage at the two ends of the preset adjustable resistor R6, namely the voltage at the same-phase end of the operational amplifier U2 is larger than the voltage at the opposite-phase end, the operational amplifier U2 outputs a high level, the triode Q3 is conducted, the relay coil is electrified, the normally-open relay is conducted, and the street lamp is started; when the ambient light is lightened, the resistance value of the resistance of the photoresistor PR is reduced along with the enhancement of the ambient light, and when the voltage at the two ends of the photoresistor PR is smaller than the voltage at the two ends of the preset adjustable resistor R6, namely the voltage at the same-phase end of the operational amplifier U2 is lower than the voltage at the opposite-phase end, the operational amplifier U2 outputs a low level, the triode Q3 is cut off, the relay coil is powered off, the normally-open relay is closed, and the street lamp is closed; the adjustable resistor R6 can be adjusted to set the preset value of the ambient light for turning on or off the street lamp, namely, a user can set the resistance value of the adjustable resistor R6 according to the actual condition of the target place, so that the ambient light threshold for turning on or off the street lamp is set.
In this embodiment, the power supply includes: the voltage-reducing rectifying circuit is characterized by comprising a voltage-reducing rectifying circuit, an overvoltage protection circuit and a voltage stabilizing circuit, wherein the input end of the voltage-reducing rectifying circuit is connected with a mains supply, the output end of the voltage-reducing rectifying circuit is connected with the input end of the overvoltage protection circuit, the output end of the overvoltage protection circuit is connected with the input end of the voltage stabilizing circuit, and the voltage stabilizing circuit outputs constant working voltage. The voltage stabilizing circuit adopts the existing voltage stabilizing chip, such as an LM7805 voltage stabilizing chip, and is not described herein again; the step-down rectifying circuit comprises a transformer T1, a transient diode TVS1, a capacitor C1 and a full-bridge rectifying circuit ZL, wherein a winding of the transformer T1 is connected with a mains supply, a secondary winding of the transformer T1 is connected with the full-bridge rectifying circuit ZL, a positive output end of the full-bridge rectifying circuit ZL is connected with an input end of a fuse F1, a negative output end of the full-bridge rectifying circuit ZL is grounded, one end of the transient diode is connected with a common connection point of the transformer T1 and the full-bridge rectifying circuit ZL, the other end of the transient diode is grounded, one end of the capacitor C1 is connected with a common connection point of a positive output end of the full-bridge rectifying circuit ZL and the fuse F1, and the other end of the capacitor C1 is grounded; the power supply provides stable voltage for the subsequent process;
in this embodiment, the overvoltage protection circuit includes a fuse F1, a varistor RV, an adjustable resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a transistor Q1, and a transistor Q2;
one end of a fuse F1 is connected with the output end of a buck rectifying circuit, the other end of the fuse F1 is connected with the collector of a triode Q1 through an adjustable resistor R1, one end of a resistor R2 is connected with the public connection point of the collector of the adjustable resistor R1 and a triode Q1, the other end of the resistor R2 is grounded through a resistor R3, the base of the triode Q1 is connected with the public connection point of the resistor R2 and the resistor R3, the emitter of the triode Q1 is connected with a voltage stabilizing circuit, one end of a piezoresistor RV is connected with the public connection point of the fuse F1 and the adjustable resistor R1, the other end of the piezoresistor RV is grounded through a resistor R4, the base of the triode Q2 is connected with the public connection point of the piezoresistor RV and the resistor R4 through a resistor R5, the collector of the triode Q2 is connected with the base of the triode Q1, and the emitter of the triode Q2 is grounded.
When the voltage in the circuit exceeds the preset voltage threshold value, the piezoresistor becomes smaller, so that the current flowing through the piezoresistor is increased suddenly, thereby conducting the transistor Q2, pulling down the base voltage of the transistor Q1, disconnecting the transistor Q1 from the subsequent circuit, protecting the subsequent circuit, and when the voltage is too high, the current flowing through the RV is increased suddenly, and simultaneously, if the condition that the fuse F1 is fused is reached, the fuse F1 is fused, so that double protection is formed.
In this embodiment, a heat sink and a heat dissipation control circuit are included,
the input end of the heat dissipation device is connected with a power supply, and heat is dissipated when the power is on;
and the heat dissipation control circuit is used for detecting the ambient temperature inside the street lamp and controlling the on-off between the heat dissipation device and the power supply according to the ambient temperature.
The LED chip is greatly affected by temperature, the heat dissipation performance of the LED street lamp is improved, and the working environment of the lED chip can be effectively ensured, the heat dissipation device adopts the existing heat dissipation device, in the embodiment, the heat dissipation device adopts a semiconductor refrigeration piece, wherein the cold end surface of the semiconductor refrigeration piece is contacted with the control circuit board 5, the heat end surface of the semiconductor refrigeration piece is provided with a heat dissipation fin 6, and the heat dissipation fin 6 extends into the accommodating cavity of the umbrella-shaped lamp holder 1; the voltage stabilizing circuit adopts the existing voltage stabilizing chip, such as 78 series chips, and a person skilled in the art can select a proper voltage stabilizing chip according to the actual working condition.
In this embodiment, the heat dissipation control circuit includes a resistor R13, a resistor R14, an adjustable resistor R15, a resistor R16, a resistor R17, a PTC thermistor PTC2, an op-amp U4, and a transistor Q5;
one end of a resistor R13 is connected with the output end of the voltage stabilizing circuit, the other end of the resistor R13 is grounded through a positive temperature coefficient thermistor PTC2, one end of a resistor R14 is connected with the output end of the voltage stabilizing circuit, the other end of the resistor R14 is grounded through an adjustable resistor R15, the in-phase end of an operational amplifier U4 is connected with the common connection point of the resistor R13 and the positive temperature coefficient thermistor PTC2, the opposite phase end of the operational amplifier U4 is connected with the common connection point of the resistor R14 and the adjustable resistor R15, the output end of the operational amplifier U4 connects a resistor R16 with the base electrode of a triode Q5, the collector electrode of the triode Q5 is connected with the output end of the voltage stabilizing circuit through a resistor R17, the emitter electrode of the triode Q5 is connected with a heat dissipation device,
the triode Q5 is an NPN triode.
The resistance value of the positive temperature coefficient thermistor PTC2 increases along with the increase of the temperature, the potential of the PTC2 increases, namely the voltage of the same-phase end of the operational amplifier U4 increases, when the temperature increases to a preset threshold value, the voltage of the same-phase end of the operational amplifier U4 is higher than the voltage of the opposite-phase end, the operational amplifier U4 outputs a high level, the triode Q5 is conducted, and therefore the heat radiating device is connected with a power supply, and is in a working state; otherwise, the triode Q5 is cut off, so that the heat radiating device is disconnected from the power supply, and the heat radiating device is in a non-working state.
In this embodiment, a PTC thermistor PTC1, one end of the PTC thermistor PCT1 is connected to a power source, and the other end of the PTC thermistor PCT1 is connected to an input end of the LED array. The positive temperature coefficient thermistor PTC1 plays a shunt role in the LED array, when the temperature rises, the resistance of the PTC1 rises along with the increase, the resistance of the LED array decreases, the current in the circuit increases, at the moment, the shunt role of the PTC1 on the LED array increases, and the voltage at two ends of the LED array is reduced under the condition that the input voltage is constant, so that the current change of the LEDs is inhibited, and the current of the LED array is kept constant.
In this embodiment, the constant current LED intelligent control street lamp based on the brightness transformation of the ambient light further includes a lamp shade 2, the control circuit board is disposed at the necking end of the lamp shade, the LED array is disposed at the control circuit board, the heat dissipating device is disposed at the necking end of the lamp shade and seals the necking end, and the heat dissipating device is disposed above the control circuit board. Wherein the power supply circuit, the constant current circuit, the LED control circuit, the heat dissipation control circuit and the LED array 5 are packaged on a Printed Circuit Board (PCB) to form a control circuit board 4. Through the technical scheme, rainwater can be effectively prevented from entering the control circuit board, so that the control circuit board is short-circuited, and the service life of the street lamp is prolonged.
As shown in fig. 1 to 2, the constant current LED intelligent control street lamp based on ambient light brightness transformation further comprises an umbrella skirt lamp holder 1, the umbrella skirt lamp holder 1 is sequentially provided with a first umbrella skirt lamp holder 101 and a second umbrella skirt lamp holder 102 from top to bottom, the lower ends of the first umbrella skirt lamp holder 101 and the second umbrella lamp holder 102 are respectively provided with a hollow cylindrical connecting column 9 and 10, the upper end of the cylindrical 9 of the first umbrella lamp holder is connected with the lower end of the first umbrella lamp holder 101, the lower end of the cylindrical 9 of the first umbrella lamp holder is fixedly connected with the upper end of the second umbrella lamp holder 102, the inner sides of the first umbrella lamp holder 101 and the second umbrella lamp holder 102 are of hollow structures and are communicated up and down to form a containing cavity, the side walls of the cylindrical 9 and 10 connecting columns are respectively provided with a vent hole 7, and a power line perforation is reserved at the upper end of the umbrella skirt 1. Through above-mentioned technical scheme, strengthened ventilation, the increase of heat dissipation space promotes heat dispersion, and can shelter from the wind and rain, avoids the rainwater to get into. The street lamp further comprises a hanging ring 8, and the hanging ring 8 is used for connecting the street lamp with the street lamp supporting rod.
In this embodiment, the heat dissipating device is disposed in the second umbrella skirt lamp holder, the control circuit board is disposed on the lower surface of the heat dissipating device, and the LED array is disposed on the control circuit board. The power supply circuit, the constant current circuit, the LED control circuit, the heat dissipation control circuit and the LED array 5 are packaged on a Printed Circuit Board (PCB) to form a control circuit board 4.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (4)
1. A constant-current LED intelligent control street lamp based on ambient light brightness transformation is characterized in that: at least comprises an LED array, an LED control circuit, a constant current circuit, a heat dissipation device and a heat dissipation control circuit
The input end of the LED array is connected with a power supply, and emits light when the LED array is electrified;
the power supply end of the constant current circuit is connected with the power supply and is used for detecting the working current of the LED array and controlling the working current of the LED array to be in a set threshold range according to the change of the working current of the LED array;
the LED control circuit is used for detecting the ambient light of the environment where the LED array is positioned and controlling the on-off between the input end of the LED array and the power supply end of the constant current circuit and the power supply according to the ambient light;
the constant current circuit includes: the adjustable resistor R10, the resistor R11, the resistor R12, the operational amplifier U3 and the MOS tube Q4; one end of an adjustable resistor R10 is connected with a power supply, the other end of the adjustable resistor R10 is connected with the same-phase end of an operational amplifier U3, the output end of the operational amplifier U3 is connected with the grid electrode of a MOS tube Q4 through a resistor R11, the drain electrode of the MOS tube Q4 is connected with the negative electrode of the LED array, the drain electrode of the MOS tube Q4 is grounded through a resistor R12, and the opposite-phase end of the operational amplifier U3 is connected with the common connection point of the drain electrode of the MOS tube Q4 and the resistor R12; the MOS tube Q4 is an N-channel enhanced MOS tube;
the LED control circuit includes: the resistor R5, the adjustable resistor R6, the resistor R7, the resistor R8, the resistor R9, the photoresistor PR, the operational amplifier U2, the triode Q3 and the relay JD1; one end of a resistor R5 is connected with the output end of the voltage stabilizing circuit, the other end of the resistor R5 is grounded through an adjustable resistor R6, one end of a resistor R7 is connected with the output end of the voltage stabilizing circuit, the other end of the resistor R7 is grounded through a photoresistor PR, the inverting end of an operational amplifier U2 is connected with the common connection point of the resistor R5 and the adjustable resistor R6, the non-inverting end of the operational amplifier U2 is connected with the common connection point of the resistor R7 and the photoresistor PR, the output end of the operational amplifier U2 is connected with the base electrode of a triode Q3 through a resistor R8, the collector electrode of the triode Q3 is connected with the output end of the voltage stabilizing circuit, the emitter electrode of the triode Q3 is connected with one end of a coil of a relay JD1, the other end of the coil of the relay JD1 is grounded, and a switch of the relay JD1 is arranged between a power supply and the power supply end of the constant current circuit; the triode Q3 is an NPN triode, and the relay JD1 is a normally open relay;
the power supply includes: the voltage-reducing rectifier circuit is connected with the mains supply at the input end, the output end of the voltage-reducing rectifier circuit is connected with the input end of the overvoltage protection circuit, the output end of the overvoltage protection circuit is connected with the input end of the voltage-stabilizing circuit, and the voltage-stabilizing circuit outputs constant working voltage;
the input end of the heat dissipation device is connected with a power supply, and heat is dissipated when the power is on;
the heat dissipation control circuit is used for detecting the ambient temperature inside the street lamp and controlling the on-off between the heat dissipation device and the power supply according to the ambient temperature; the heat dissipation control circuit comprises a resistor R13, a resistor R14, an adjustable resistor R15, a resistor R16, a resistor R17, a positive temperature coefficient thermistor PTC2, an operational amplifier U4 and a triode Q5; one end of a resistor R13 is connected with the output end of the voltage stabilizing circuit, the other end of the resistor R13 is grounded through a positive temperature coefficient thermistor PTC2, one end of a resistor R14 is connected with the output end of the voltage stabilizing circuit, the other end of the resistor R14 is grounded through an adjustable resistor R15, the in-phase end of an operational amplifier U4 is connected with a common connection point of the resistor R13 and the positive temperature coefficient thermistor PTC2, the opposite phase end of the operational amplifier U4 is connected with the common connection point of the resistor R14 and the adjustable resistor R15, the output end of the operational amplifier U4 is used for connecting a resistor R16 with the base electrode of a triode Q5, the collector electrode of the triode Q5 is connected with the output end of the voltage stabilizing circuit through a resistor R17, and the emitter electrode of the triode Q5 is connected with a heat dissipation device; the triode Q5 is an NPN triode.
2. The constant current LED intelligent control street lamp based on ambient light brightness transformation according to claim 1, wherein: the overvoltage protection circuit comprises a fuse F1, a piezoresistor RV, an adjustable resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a triode Q1 and a triode Q2;
one end of a fuse F1 is connected with the output end of a buck rectifying circuit, the other end of the fuse F1 is connected with the collector of a triode Q1 through an adjustable resistor R1, one end of a resistor R2 is connected with the public connection point of the collector of the adjustable resistor R1 and a triode Q1, the other end of the resistor R2 is grounded through a resistor R3, the base of the triode Q1 is connected with the public connection point of the resistor R2 and the resistor R3, the emitter of the triode Q1 is connected with a voltage stabilizing circuit, one end of a piezoresistor RV is connected with the public connection point of the fuse F1 and the adjustable resistor R1, the other end of the piezoresistor RV is grounded through a resistor R4, the base of the triode Q2 is connected with the public connection point of the piezoresistor RV and the resistor R4 through a resistor R5, the collector of the triode Q2 is connected with the base of the triode Q1, and the emitter of the triode Q2 is grounded.
3. The constant current LED intelligent control street lamp based on ambient light brightness transformation according to claim 1, wherein: the constant current circuit further includes: one end of the positive temperature coefficient thermistor PTC1 is connected with a power supply, and the other end of the positive temperature coefficient thermistor PCT1 is connected with the input end of the LED array.
4. A constant current LED intelligent control street lamp based on ambient light dimming according to any of claims 1-3, characterized in that: the constant-current LED intelligent control street lamp based on ambient light brightness transformation further comprises a lamp shade, a control circuit board is arranged at the necking end of the lamp shade, the LED array is arranged on the control circuit board, the heat dissipation device is arranged at the necking end of the lamp shade and seals the necking end, and the heat dissipation device is arranged above the control circuit board.
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| WO1995012512A1 (en) * | 1993-11-05 | 1995-05-11 | Siemens Integra Verkehrstechnik Ag | Circuit for emitting optical signals |
| CN107094337A (en) * | 2017-06-30 | 2017-08-25 | 台州市椒光照明有限公司 | A kind of light-operated Width funtion LED lamp drive circuit |
| CN109714856A (en) * | 2018-12-27 | 2019-05-03 | 重庆绿色科技开发（集团）有限公司 | Three primary colours multi color temperature LED street lamp intelligent control based on environment measuring |
| CN211531391U (en) * | 2019-05-20 | 2020-09-18 | 重庆怡景实业有限公司 | LED intelligent control street lamp |
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2019
- 2019-05-20 CN CN201910418814.XA patent/CN110049599B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995012512A1 (en) * | 1993-11-05 | 1995-05-11 | Siemens Integra Verkehrstechnik Ag | Circuit for emitting optical signals |
| CN107094337A (en) * | 2017-06-30 | 2017-08-25 | 台州市椒光照明有限公司 | A kind of light-operated Width funtion LED lamp drive circuit |
| CN109714856A (en) * | 2018-12-27 | 2019-05-03 | 重庆绿色科技开发（集团）有限公司 | Three primary colours multi color temperature LED street lamp intelligent control based on environment measuring |
| CN211531391U (en) * | 2019-05-20 | 2020-09-18 | 重庆怡景实业有限公司 | LED intelligent control street lamp |
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