CN110972362A - NB-IOT wireless control's multichannel constant current single-lamp control system - Google Patents
NB-IOT wireless control's multichannel constant current single-lamp control system Download PDFInfo
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Abstract
The application provides a NB-IOT wireless control's multichannel constant current list lamp control system, includes: the system comprises an NB-IOT (network B-Internet of things) street lamp terminal, an NB-IOT base station and an IOT street lamp platform; the NB-IoT internet of things terminal comprises a mains supply unit, an on-off control unit, an alternating current-to-direct current circuit, a filter circuit, a constant voltage circuit, a constant current circuit and a communication unit; the on-off control unit is in communication connection with the NB-IoT base station through the communication unit, the input end of the on-off control unit is connected with the commercial power supply unit, the output end of the on-off control unit is connected with the input end of the alternating current-direct current conversion circuit, the output end of the constant voltage circuit is connected with the input end of the constant current circuit, and the output end of the constant current circuit is connected with the LED street lamp. The accurate control of a single street lamp is realized through an NB-IOT terminal, an NB-IOT base station and the concentration of a plurality of lighting street lamps to an IOT street lamp platform; meanwhile, constant current driving is adopted, and the actual service life of the LED street lamp is prolonged.
Description
Technical Field
The invention relates to the field of illumination, in particular to a multi-channel constant-current single-lamp control system under NB-IOT wireless control.
Background
The street lamp is an important part for providing urban illumination, the traditional street lamp usually adopts a high-pressure sodium lamp, and the energy is wasted due to the defect of low overall glazing effect of the high-pressure sodium lamp; the LED is a novel light source which is energy-saving, environment-friendly, small in size, sensitive in response, multi-colored and long in service life, and in recent years, LED illumination is gradually applied to street lamp illumination; the theoretical life of the LED is as long as 10 ten thousand hours, but in practical application, because the design of the driving power supply and the selection of the driving mode are improper, for example, the current of the voltage-stabilizing driving circuit changes along with the transformation of load impedance, the current-stabilizing capacity is poor, the LED street lamp is easy to damage, and the service life of the LED is greatly shortened; meanwhile, in order to enhance the management of the LED street lamps, the LED street lamps are usually centralized on one platform in a wired or wireless communication manner, but the existing wired communication has a short distance, and the wireless communication has the defects of high cost, small access amount, large power consumption and the like.
Therefore, a wireless LED street lamp constant current control system with low power consumption and large access amount is needed.
Disclosure of Invention
In view of this, the present application provides a NB-IOT wireless controlled multi-channel constant current single lamp control system.
The application provides a NB-IOT wireless control's multichannel constant current list lamp control system, its characterized in that: the method comprises the following steps: the system comprises an NB-IOT (network B-Internet of things) street lamp terminal, an NB-IOT base station and an IOT street lamp platform;
the NB-IoT internet of things terminals are arranged at each street lamp terminal and are used for controlling the on or off and driving modes of a single street lamp;
the NB-IoT Internet of things base station is in communication connection with the NB-IoT Internet of things terminal and is used for transmitting the real-time state of the NB-IoT Internet of things terminal to the IOT street lamp platform through the IOT core network;
the IOT street lamp platform is in communication connection with the NB-IoT base station through an IOT core network, issues a control command to the NB-IoT base station and receives real-time information of the NB-IoT transmission session;
the NB-IoT internet of things terminal comprises a mains supply unit, an on-off control unit, an alternating current-to-direct current circuit, a filter circuit, a constant voltage circuit, a constant current circuit and a communication unit; the on-off control unit is in communication connection with the NB-IoT base station through the communication unit, the input end of the on-off control unit is connected with the commercial power supply unit, the output end of the on-off control unit is connected with the input end of the alternating current-to-direct current circuit, the output end of the alternating current-to-direct current circuit is connected with the input end of the filter circuit, the output end of the filter circuit is connected with the input end of the constant voltage circuit, the output end of the constant voltage circuit is connected with the input end of the constant current circuit, and the output end of the constant current circuit is connected with the LED street lamp.
Further, the NB-IOT terminal further includes an overcurrent protection circuit, and the overcurrent protection circuit is configured to detect whether a current at an output end of the constant voltage circuit is greater than a preset current value, and start overcurrent protection after the output current value is greater than the preset current value.
Further, the constant-voltage circuit comprises a resistor R1, a resistor R2, a resistor R4, a resistor R5, a voltage stabilizing diode DW1, a comparator U1 and a triode Q1;
the collector of a triode Q1 is connected with the output end of a filter circuit, the emitter of a triode Q1 is connected with one end of a resistor R4, the other end of a resistor R4 is grounded through a resistor R5, one end of a resistor R1 is connected with the output end of the filter circuit, the other end of a resistor R1 is connected with the base of a triode Q1, one end of a resistor R2 is connected with the output end of the filter circuit, the other end of a resistor R2 is connected with the negative electrode of a zener diode DW1, the positive electrode of the zener diode DW1 is grounded, the inverting end of a comparator U1 is connected with the common connection point of the resistor R4 and the resistor R5, the non-inverting end of the comparator U1 is connected with the common connection point of the resistor R2 and the negative electrode of the zener diode DW1, and the output end of the;
the transistor Q1 is an NPN transistor.
Further, the constant voltage circuit also comprises an anti-oscillation circuit, the anti-oscillation circuit comprises an inductor L1, one end of an inductor L1 is connected with an emitter of the triode Q1, and the other end of the inductor L1 is connected with one end of a resistor R4.
Further, the constant current circuit comprises a positive temperature coefficient thermistor PTC, a negative temperature coefficient thermistor NTC, a resistor R6, a resistor R7, a resistor R8, a triode Q3 and a triode Q4;
one end of a resistor R6 is connected with a common connection point of an inductor L1 and a resistor R4, the other end of the resistor R6 is connected with one end of a capacitor C1, the other end of the capacitor C1 is grounded, one end of a positive temperature coefficient thermistor PTC is connected with a common connection point of an inductor L1 and a resistor R4, the other end of the positive temperature coefficient thermistor PTC is connected with one end of a negative temperature coefficient thermistor NTC, one end of the negative temperature coefficient thermistor NTC is connected with the anode of a light emitting diode LED of the LED street lamp, the cathode of a light emitting diode is connected with one end of a resistor R7, the other end of the resistor R7 is connected with the collector of a triode Q3, the emitter of a triode Q3 is grounded through a resistor R8, the base of a triode Q3 is connected with a common connection point of a resistor R6 and a capacitor C1, the collector of a triode Q4 is connected with a common connection point of a resistor R6 and a capacitor C1, the base of a triode Q58, the emitter of the triode Q4 is grounded;
the transistor Q3 and the transistor Q4 are both NPN transistors.
Furthermore, all the branches of the light emitting diode LED are connected in parallel.
Further, the overcurrent protection circuit comprises a resistor R3 and a triode Q2;
one end of a resistor R3 is connected with one end of an inductor L1, the other end of a resistor R3 is connected with one end of a resistor R4, the base of a triode Q2 is connected with the common connection point of the inductor L1 and the resistor R3, the emitter of the triode Q2 is connected with the common connection point of the resistor R3 and the resistor R4, and the collector of the triode Q2 is connected with the common connection point of the resistor R1 and the base of the triode Q1;
the transistor Q1 is an NPN transistor.
Further, the mains supply unit at least comprises a voltage reduction circuit, and the voltage reduction circuit converts the mains supply voltage into the working voltage of the LED street lamp.
The invention has the beneficial technical effects that: the accurate control of a single street lamp is realized through an NB-IOT terminal, an NB-IOT base station and the concentration of a plurality of lighting street lamps to an IOT street lamp platform; meanwhile, constant current driving is adopted, and the actual service life of the LED street lamp is prolonged.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a block diagram of the present invention.
Fig. 2 is a structural block diagram of the NB-IOT internet of things terminal of the present invention.
Fig. 3 is a circuit schematic diagram of the terminal of the internet of things of the invention.
Detailed Description
The invention is further described with reference to the accompanying drawings in which:
the invention provides a multi-channel constant-current single-lamp control system under NB-IOT wireless control, which is characterized in that: the method comprises the following steps: the system comprises an NB-IOT (network B-Internet of things) street lamp terminal, an NB-IOT base station and an IOT street lamp platform;
the NB-IoT internet of things terminals are arranged at each street lamp terminal and are used for controlling the on or off and driving modes of a single street lamp;
the NB-IoT Internet of things base station is in communication connection with the NB-IoT Internet of things terminal and is used for transmitting the real-time state of the NB-IoT Internet of things terminal to the IOT street lamp platform through the IOT core network;
the IOT street lamp platform is in communication connection with the NB-IoT base station through an IOT core network, issues a control command to the NB-IoT base station and receives real-time information of the NB-IoT transmission session;
the NB-IoT internet of things terminal comprises a mains supply unit, an on-off control unit, an alternating current-to-direct current circuit, a filter circuit, a constant voltage circuit, a constant current circuit and a communication unit; the on-off control unit is in communication connection with the NB-IoT base station through the communication unit, the input end of the on-off control unit is connected with the commercial power supply unit, the output end of the on-off control unit is connected with the input end of the alternating current-to-direct current circuit, the output end of the alternating current-to-direct current circuit is connected with the input end of the filter circuit, the output end of the filter circuit is connected with the input end of the constant voltage circuit, the output end of the constant voltage circuit is connected with the input end of the constant current circuit, and the output end of the constant current circuit is connected with the LED street lamp. The alternating current-to-direct current circuit adopts a full-bridge rectifying circuit formed by the existing diodes; the filter circuit adopts the existing filter circuit, such as polar capacitance filtering and RC filtering, and is not described herein again. The communication unit adopts the existing wireless communication mode, such as WIFI, RF radio frequency and the like, and the communication control circuit adopts the existing micro control unit with the communication function.
The internet of things is based on computer science and comprises comprehensive technologies and application integrating technologies such as network, electronics, radio frequency, induction, wireless, artificial intelligence, bar codes, cloud computing, automation, embedding and the like, isolated objects (refrigerators, automobiles, equipment, furniture, goods and the like) can be accessed into the world of the network, and the isolated objects can be communicated with one another and are fresh and alive. The NB-IoT (Narrow Band Internet of Things based on cellular network) technology adopts designs such as ultra-Narrow Band, repeated transmission, simplified network protocol, etc. to sacrifice certain rate, delay, and mobility performance, and obtain the load-bearing capability of LPWA (Low power wide Area technology) Internet of Things. NB-IoT is used as a new solution of the LPWA for narrowband cellular communication, and will bring great revolution and innovation to the industry of the Internet of things. The solution has many advantages, embodied as: ultra-strong coverage, which is 20dB stronger than GPRS coverage, has stronger penetrating power and wider coverage range; ultra-low power-10 years battery life, adopting DRX (Discontinuous Reception) and PSM (power save mode) energy saving technology, making the terminal battery life longer, the battery life can be as long as 10 years; the ultra-low cost-low price terminal chip has the advantage of low cost because the chip is made to be small due to low speed, low power consumption and low bandwidth. Meanwhile, the cost of the NB-IoT module, the power supply cost and the communication operation cost are cheaper than those of other wireless devices; ultra-large connections-support large-scale connections, 100K terminals/200 KHz cells. The six main application scenarios of the NB-IoT technology are the scenarios that are difficult to support by the existing mobile communication, including location tracking, environmental monitoring, intelligent parking, remote meter reading, agriculture, and animal husbandry. Market research corporation Machina predicts that NB-IoT will cover 25% of internet of things connections in the future.
By the technical scheme, the LED street lamp is controlled to be connected to the same control platform through NB-IoT, so that the single street lamp can be accurately controlled; meanwhile, constant current driving is adopted, and the actual service life of the LED street lamp is prolonged.
In this embodiment, the NB-IOT terminal further includes an overcurrent protection circuit, where the overcurrent protection circuit is configured to detect whether a current at an output end of the constant voltage circuit is greater than a preset current value, and start overcurrent protection after the output current value is greater than the preset current value.
The constant-voltage circuit comprises a resistor R1, a resistor R2, a resistor R4, a resistor R5, a voltage stabilizing diode DW1, a comparator U1 and a triode Q1;
the collector of a triode Q1 is connected with the output end of a filter circuit, the emitter of a triode Q1 is connected with one end of a resistor R4, the other end of a resistor R4 is grounded through a resistor R5, one end of a resistor R1 is connected with the output end of the filter circuit, the other end of a resistor R1 is connected with the base of a triode Q1, one end of a resistor R2 is connected with the output end of the filter circuit, the other end of a resistor R2 is connected with the negative electrode of a zener diode DW1, the positive electrode of the zener diode DW1 is grounded, the inverting end of a comparator U1 is connected with the common connection point of the resistor R4 and the resistor R5, the non-inverting end of the comparator U1 is connected with the common connection point of the resistor R2 and the negative electrode of the zener diode DW1, and the output end of the;
the transistor Q1 is an NPN transistor.
The working principle is as follows:
the voltage of the inverting terminal of the comparator U1 is the voltage at the two ends of the resistor R5, that is, the voltage of the inverting terminal of the comparator U1 is (R5/R4+ R5) multiplied by the output voltage, that is, the change of the output voltage can be fed back to the inverting terminal of the comparator U1 through the voltage at the two ends of the resistor R5, when the output voltage increases, the voltage of the output terminal of the comparator U1 decreases, the base voltage of the triode Q1 decreases, the output voltage of the triode decreases, and the output voltage decreases; when the output voltage is reduced, the voltage output by the output end of the comparator U1 is increased, the base voltage of the triode Q1 is increased, the output voltage of the triode is increased, and the output voltage is increased; thereby realizing the constancy of the output voltage; the larger the gain of the comparator U1, the better the stability of the output voltage.
The constant voltage circuit further comprises an anti-oscillation circuit, the anti-oscillation circuit comprises an inductor L1, one end of an inductor L1 is connected with an emitter of a triode Q1, and the other end of an inductor L1 is connected with one end of a resistor R4. The comparator can amplify direct current, and the gain is very large in the frequency domain range of several megahertz, so that oscillation is easily caused, abnormal loss is generated by oscillation, and loss of components is also caused, so that the oscillation is avoided as much as possible by the power supply circuit.
The constant current circuit comprises a positive temperature coefficient thermistor PTC, a negative temperature coefficient thermistor NTC, a resistor R6, a resistor R7, a resistor R8, a triode Q3 and a triode Q4;
one end of a resistor R6 is connected with a common connection point of an inductor L1 and a resistor R4, the other end of the resistor R6 is connected with one end of a capacitor C1, the other end of the capacitor C1 is grounded, one end of a positive temperature coefficient thermistor PTC is connected with a common connection point of an inductor L1 and a resistor R4, the other end of the positive temperature coefficient thermistor PTC is connected with one end of a negative temperature coefficient thermistor NTC, one end of the negative temperature coefficient thermistor NTC is connected with the anode of a light emitting diode LED of the LED street lamp, the cathode of a light emitting diode is connected with one end of a resistor R7, the other end of the resistor R7 is connected with the collector of a triode Q3, the emitter of a triode Q3 is grounded through a resistor R8, the base of a triode Q3 is connected with a common connection point of a resistor R6 and a capacitor C1, the collector of a triode Q4 is connected with a common connection point of a resistor R6 and a capacitor C1, the base of a triode Q58, the emitter of the triode Q4 is grounded;
the transistor Q3 and the transistor Q4 are both NPN transistors.
The working principle is as follows:
the positive temperature coefficient thermistor PTC and the negative temperature coefficient thermistor NTC form a temperature compensation circuit;
when the temperature rises, the resistance value of the positive temperature coefficient thermistor PTC is increased, meanwhile, the resistance value of the negative temperature coefficient thermistor NTC is reduced, the temperature change is realized through the selection of the positive temperature coefficient thermistor PTC and the negative temperature coefficient thermistor NTC, and the resistance value of the resistor formed by connecting the positive temperature coefficient thermistor PTC and the negative temperature coefficient thermistor NTC in series is kept unchanged;
when the temperature is reduced, the resistance value of the positive temperature coefficient thermistor PTC is reduced, meanwhile, the resistance value of the negative temperature coefficient thermistor NTC is increased, the temperature change is realized through the selection of the positive temperature coefficient thermistor PTC and the negative temperature coefficient thermistor NTC, and the resistance value of the resistor formed by connecting the positive temperature coefficient thermistor PTC and the negative temperature coefficient thermistor NTC in series is kept unchanged; thereby realizing temperature compensation; that is, the current of the circuit does not change due to the change of temperature;
when the transistor Q4 is turned on after the transistor Q3 is turned on, the current flowing through the resistor R8 is equal to the difference between the base and emitter voltages of the transistor Q4 divided by the resistor R8, i.e., I is equal to Vbe/R8, when the transistor Q4 is in a saturation state, the base voltage and the emitter voltage are constant, so that the current flowing through the resistor R8 is constant, and the light emitting diode LED is connected in series with the resistor R8, so that the current flowing through the light emitting diode is constant.
And all the branches of the LED are connected in parallel. The anti-fault performance of the LED street lamp is enhanced through the parallel connection of the LED branches.
The overcurrent protection circuit comprises a resistor R3 and a triode Q2;
one end of a resistor R3 is connected with one end of an inductor L1, the other end of a resistor R3 is connected with one end of a resistor R4, the base of a triode Q2 is connected with the common connection point of the inductor L1 and the resistor R3, the emitter of the triode Q2 is connected with the common connection point of the resistor R3 and the resistor R4, and the collector of the triode Q2 is connected with the common connection point of the resistor R1 and the base of the triode Q1;
the transistor Q1 is an NPN transistor.
The working principle is as follows:
the voltage drop at the two ends of the resistor R3 is closely related to the current flowing through the resistor R3, when the voltage drop at the two ends of the resistor R3 is large and the conduction voltage of the base electrode and the emitting electrode of the triode Q2 is high, the triode Q2 is conducted, the collector electrode of the triode Q2 shunts the current entering the base electrode of the triode Q1, the base electrode current of the triode Q1 is reduced, the triode Q1 works in an amplification state, and after the base electrode current of the triode is reduced, the emitter electrode current of the triode is reduced, so that the current is prevented from being too high, and.
The mains supply unit at least comprises a voltage reduction circuit, and the voltage reduction circuit converts mains voltage into working voltage of the LED street lamp. The voltage reduction circuit adopts the existing voltage reducer, and the details are not repeated.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, 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 or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (8)
1. The utility model provides a NB-IOT wireless control's multichannel constant current single-lamp control system which characterized in that: the method comprises the following steps: the system comprises an NB-IOT (network B-Internet of things) street lamp terminal, an NB-IOT base station and an IOT street lamp platform;
the NB-IoT internet of things terminals are arranged at each street lamp terminal and are used for controlling the on or off and driving modes of a single street lamp;
the NB-IoT Internet of things base station is in communication connection with the NB-IoT Internet of things terminal and is used for transmitting the real-time state of the NB-IoT Internet of things terminal to the IOT street lamp platform through the IOT core network;
the IOT street lamp platform is in communication connection with the NB-IoT base station through an IOT core network, issues a control command to the NB-IoT base station and receives real-time information of the NB-IoT transmission session;
the NB-IoT internet of things terminal comprises a mains supply unit, an on-off control unit, an alternating current-to-direct current circuit, a filter circuit, a constant voltage circuit, a constant current circuit and a communication unit; the on-off control unit is in communication connection with the NB-IoT base station through the communication unit, the input end of the on-off control unit is connected with the commercial power supply unit, the output end of the on-off control unit is connected with the input end of the alternating current-to-direct current circuit, the output end of the alternating current-to-direct current circuit is connected with the input end of the filter circuit, the output end of the filter circuit is connected with the input end of the constant voltage circuit, the output end of the constant voltage circuit is connected with the input end of the constant current circuit, and the output end of the constant current circuit is connected with the LED street lamp.
2. The NB-IOT wirelessly controlled multi-channel constant current single lamp control system of claim 1, wherein: the NB-IOT terminal further comprises an overcurrent protection circuit, wherein the overcurrent protection circuit is used for detecting whether the current of the output end of the constant voltage circuit is larger than a preset current value or not and starting overcurrent protection after the output current value is larger than the preset current value.
3. The NB-IOT wirelessly controlled multi-channel constant current single lamp control system of claim 2, wherein: the constant-voltage circuit comprises a resistor R1, a resistor R2, a resistor R4, a resistor R5, a voltage stabilizing diode DW1, a comparator U1 and a triode Q1;
the collector of a triode Q1 is connected with the output end of a filter circuit, the emitter of a triode Q1 is connected with one end of a resistor R4, the other end of a resistor R4 is grounded through a resistor R5, one end of a resistor R1 is connected with the output end of the filter circuit, the other end of a resistor R1 is connected with the base of a triode Q1, one end of a resistor R2 is connected with the output end of the filter circuit, the other end of a resistor R2 is connected with the negative electrode of a zener diode DW1, the positive electrode of the zener diode DW1 is grounded, the inverting end of a comparator U1 is connected with the common connection point of the resistor R4 and the resistor R5, the non-inverting end of the comparator U1 is connected with the common connection point of the resistor R2 and the negative electrode of the zener diode DW1, and the output end of the;
the transistor Q1 is an NPN transistor.
4. The NB-IOT wirelessly controlled multi-channel constant current single lamp control system of claim 3, wherein: the constant voltage circuit further comprises an anti-oscillation circuit, the anti-oscillation circuit comprises an inductor L1, one end of an inductor L1 is connected with an emitter of a triode Q1, and the other end of an inductor L1 is connected with one end of a resistor R4.
5. The NB-IOT wirelessly controlled multi-channel constant current single lamp control system of claim 2, wherein: the constant current circuit comprises a positive temperature coefficient thermistor PTC, a negative temperature coefficient thermistor NTC, a resistor R6, a resistor R7, a resistor R8, a triode Q3 and a triode Q4;
one end of a resistor R6 is connected with a common connection point of an inductor L1 and a resistor R4, the other end of the resistor R6 is connected with one end of a capacitor C1, the other end of the capacitor C1 is grounded, one end of a positive temperature coefficient thermistor PTC is connected with a common connection point of an inductor L1 and a resistor R4, the other end of the positive temperature coefficient thermistor PTC is connected with one end of a negative temperature coefficient thermistor NTC, one end of the negative temperature coefficient thermistor NTC is connected with the anode of a light emitting diode LED of the LED street lamp, the cathode of a light emitting diode is connected with one end of a resistor R7, the other end of the resistor R7 is connected with the collector of a triode Q3, the emitter of a triode Q3 is grounded through a resistor R8, the base of a triode Q3 is connected with a common connection point of a resistor R6 and a capacitor C1, the collector of a triode Q4 is connected with a common connection point of a resistor R6 and a capacitor C1, the base of a triode Q58, the emitter of the triode Q4 is grounded;
the transistor Q3 and the transistor Q4 are both NPN transistors.
6. The NB-IOT wirelessly controlled multi-channel constant current single lamp control system of claim 5, wherein: and all the branches of the LED are connected in parallel.
7. The NB-IOT wirelessly controlled multi-channel constant current single lamp control system of claim 4, wherein: the overcurrent protection circuit comprises a resistor R3 and a triode Q2;
one end of a resistor R3 is connected with one end of an inductor L1, the other end of a resistor R3 is connected with one end of a resistor R4, the base of a triode Q2 is connected with the common connection point of the inductor L1 and the resistor R3, the emitter of the triode Q2 is connected with the common connection point of the resistor R3 and the resistor R4, and the collector of the triode Q2 is connected with the common connection point of the resistor R1 and the base of the triode Q1;
the transistor Q1 is an NPN transistor.
8. The NB-IOT wirelessly controlled multi-channel constant current single lamp control system of claim 2, wherein: the mains supply unit at least comprises a voltage reduction circuit, and the voltage reduction circuit converts mains voltage into working voltage of the LED street lamp.
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Application publication date: 20200407 |