LED intelligent street lamp controller
By designing an LED smart street light controller integrating power management unit, signal output unit, microcontroller, address management unit and communication unit, the problems of inconvenient regulation of LED street light control schemes and waste of electricity in the prior art are solved, efficient brightness adjustment and power saving are achieved, and the safety and long life of street lights are ensured.
Patent Information
- Application Number
- CN202420808987.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-18
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-04-18
AI Technical Summary
The existing LED street light control scheme is inconvenient to regulate, and the brightness adjustment is impossible to meet the lighting needs of different road sections, resulting in waste of electricity and safety hazards.
A LED smart street light controller including a power management unit, a signal output unit, a microcontroller, an address management unit and a communication unit is designed. By coordinating the operation of these modules, local policy and time management, lamp switches and dimming control can be realized, brightness adjustment can be performed for lighting needs in different sections, and the intersection traffic conditions can be detected in conjunction with the CAT4 edge gateway.
It achieves maximum saving of power and energy consumption while meeting the standard lighting requirements, and the energy saving rate can be as high as 40%-50%. Digital dimming technology is used to achieve a smooth transition of street light brightness, avoid safety hazards, and extend the working life of street lights.
Smart Images
Figure CN222827390U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of LEDs, and in particular to an LED smart street lamp controller. Background Art
[0002] With the development of China's economic reform, the pace of urbanization is being vigorously promoted. The construction of second- and third-tier cities has sprung up like mushrooms after a spring rain. As the urban population becomes more and more dense, the frequency of night travel is also increasing. The scale of urban lighting construction is gradually expanding, and the amount of electric energy consumed each year is countless. However, there is a lack of management of electricity consumption for urban road street lighting at night, and there is a large degree of energy waste.
[0003] LED lighting technology is already very mature. With its high luminous efficiency, long service life, and stable dimming control, LED has become the preferred type of lamp in the lighting market. The LED smart street light control solution is mainly based on single-lamp control, which can adjust the brightness according to the lighting needs of different road sections, and cooperate with the CAT4 edge control gateway to detect the traffic conditions at the intersection and then control the lamps.
[0004] However, the single-lamp control in the existing technical solutions still has some shortcomings. For example, the LED street lamp control solution is inconvenient to adjust and control, and the brightness cannot be adjusted according to the lighting needs of different road sections; the brightness of the lamp cannot transition smoothly, which can easily cause safety hazards and affect its service life, so it is necessary to solve this problem. Utility Model Content
[0005] The utility model aims to solve at least one of the above technical problems in the prior art to a certain extent. To this end, one purpose of the utility model is to provide an LED smart street light controller that is convenient for brightness adjustment and reduces energy consumption; can achieve a smooth transition of street light brightness, reduce safety hazards, and effectively extend its working life.
[0006] The utility model solves the above-mentioned technical problems through the following technical solutions: an LED smart street lamp controller, comprising a power management unit, a signal output unit, a single-chip microcomputer, an address management unit and a communication unit, wherein the signal end of the single-chip microcomputer is respectively connected to the signal end of the address management unit and the signal end of the communication unit, and the signal end of the communication unit is connected to an external CAT4 edge gateway; the signal end of the single-chip microcomputer is also connected to the signal output unit, and the signal output unit is connected to an external constant current dimming power supply; the input end of the power management unit is connected to the constant current dimming power supply, and the output end of the power management unit is connected to the single-chip microcomputer.
[0007] The beneficial effects of the utility model are as follows: through the coordinated operation of the power management unit, the signal output unit, the single-chip microcomputer, the address management unit, the communication unit, the constant current dimming power supply and the CAT4 edge gateway, local strategy and time management, lamp switching and dimming control are realized, the brightness can be adjusted according to the lighting needs of different road sections, and the traffic conditions at the intersection can be detected in conjunction with the CAT4 edge gateway, and then the street lights can be controlled; the power energy consumption can be saved to the greatest extent while meeting the standard lighting requirements, and the energy saving rate can be as high as 40%-50%; the digital dimming technology can be used to achieve a smooth transition of the brightness of the street lamps, avoiding safety hazards caused by instantaneous strong light illumination, while also reducing the impact on the power system and effectively extending its service life.
[0008] On the basis of the above technical solution, the present invention can also be improved as follows.
[0009] Furthermore, the power management unit includes a surge protection circuit, a BUCK buck circuit and an LDO circuit, the input end of the surge protection circuit is connected to the constant current dimming power supply, the output end of the surge protection circuit is connected to the BUCK buck circuit, the BUCK buck circuit is connected to the LDO circuit, and the LDO circuit is connected to the single-chip microcomputer.
[0010] The beneficial effect of adopting the above further solution is that the surge protection circuit, the BUCK step-down circuit and the LDO circuit provide a safe and stable power supply for the single-chip microcomputer.
[0011] Further, the surge protection circuit includes a varistor R24, a resettable fuse F3-F4 and a transient suppression diode TVS6, the varistor R24, the two ends of the varistor R24 are respectively connected to VI N+ and VI N- of the constant current dimming power supply, one end of the resettable fuse F3 is connected to one end of the varistor R24, the other end of the resettable fuse F3 is connected to one end of the transient suppression diode TVS6, one end of the resettable fuse F4 is connected to the other end of the varistor R24, and the other end of the resettable fuse F4 is connected to the other end of the transient suppression diode TVS6.
[0012] The beneficial effect of adopting the above further solution is that the surge protection circuit can effectively prevent the surge signal induced in the line caused by thunderstorm weather from damaging the subsequent circuit.
[0013] Further, the BUCK step-down circuit includes a Schottky diode D2, a Schottky diode D6, a resistor R18, a resistor R22, a resistor R25, capacitors C10-C13, an electrolytic capacitor C15, a capacitor C16 and a power management chip U4, the positive electrode of the Schottky diode D2 is connected to the self-recovery fuse F3, and the negative electrode of the Schottky diode D2 is connected to the fifth pin of the power management chip U4; one end of the capacitor C13 is connected to the negative electrode of the Schottky diode D2, and the other end is connected to the self-recovery fuse F4;
[0014] One end of the resistor R22 is connected to the fifth pin of the power management chip U4, and the other end is connected to the fourth pin of the power management chip U4; the first pin of the power management chip U4 is connected to its sixth pin via the capacitor C10, the second pin of the power management chip U4 is connected to the capacitor C13, the second pin of the power management chip U4 is also grounded, and the second pin of the power management chip U4 is also connected to the positive electrode of the Schottky diode D6; the cathode of the Schottky diode D6 is connected to the sixth pin of the power management chip U4, and the cathode of the Schottky diode D6 is also connected to one end of the resistor R18 via the inductor L1, and the other end of the resistor R18 is connected to the third pin of the power management chip U4; the capacitor C11 is connected in parallel with the resistor R18; one end of the resistor R25 is connected to the third pin of the power management chip U4, and the other end of the resistor R25 is connected to the second pin of the power management chip U4;
[0015] One end of the capacitor C12 is connected to the resistor R18 and the inductor L1, and the other end is connected to the other end of the resistor R25. The electrolytic capacitor C15 is connected in parallel with the capacitor C12; and the capacitor C16 is connected in parallel with the capacitor C12.
[0016] The beneficial effect of adopting the above further scheme is: the BUCK step-down circuit converts the input voltage into 10V, the output 10V voltage is divided by resistors R18 and R25 as feedback, and is input to the power management chip U4 through the third pin of the power management chip U4. The power management chip U4 adjusts the power supply so that the power supply can be output stably.
[0017] Furthermore, the LDO circuit includes a voltage stabilizing chip U5, an electrolytic capacitor C17, a capacitor C18 and a TVS diode D10, the first pin of the voltage stabilizing chip U5 is connected to the second pin of the power management chip U4, the second pin of the voltage stabilizing chip U5 is connected to the fourth pin thereof, the third pin of the voltage stabilizing chip U5 is connected to the resistor R18 and the inductor L1, the fourth pin of the voltage stabilizing chip U5 is connected to the first pin thereof via the electrolytic capacitor C17; the capacitor C18 is connected in parallel to the electrolytic capacitor C17; the TVS diode D10 is connected in parallel to the capacitor C18.
[0018] The beneficial effect of adopting the above further solution is that it can effectively suppress voltage fluctuations, obtain a 3.3V power supply with very small ripple, and obtain a stable power supply with even lower ripple.
[0019] Further, the signal output unit includes a resistor R19, a resistor R20, a resistor R27, a resistor R29, a resistor R36, a resistor R37, a capacitor C19, a resettable fuse F6, a transistor Q1, a MOS tube Q2, a transient suppression diode TVS4, a gas discharge tube D4 and an LED1, one end of the resistor R27 is connected to the signal output end of the single-chip computer, the other end of the resistor R27 is connected to the base of the transistor Q1, and the capacitor C19 is connected in parallel with the resistor R27; the base of the transistor Q1 is grounded via the resistor R37, and the base of the transistor Q1 is also connected to the resistor R19; the collector of the transistor Q1 is connected to the MOS tube The gate of the MOS tube is connected, the collector of the transistor Q1 is also connected to the drain of the MOS tube through resistors R20 and R36, and the emitter of the transistor Q1 is grounded; the drain of the MOS tube is grounded through resistor R29 and LED1; the source of the MOS tube is grounded; one end of the transient suppression diode TVS4 is connected to the drain of the MOS tube, and the other end of the transient suppression diode TVS4 is grounded; one end of the self-recovery fuse F6 is connected to the drain of the MOS tube, and the other end is connected to the constant current dimming power supply; one end of the gas discharge tube D4 is connected to the self-recovery fuse F6, and the other end of the gas discharge tube D4 is grounded.
[0020] The beneficial effect of adopting the above further scheme is: using the signal output unit to convert the 3.3V PWM signal of the microcontroller output amplitude into a 10V PWM signal, reducing the attenuation of the dimming signal during transmission in the line, avoiding uncontrollable problems; it can also prevent surge pulses from entering the subsequent circuit, thereby playing a protective role.
[0021] Further, the communication unit includes a gas discharge tube D3, a resettable fuse F1-F2, a transient suppression diode TVS1-TVS3, a resistor R2, a resistor R4, a resistor R5, a resistor R6, a resistor R8, a resistor R9 and a transceiver U2, both ends of the gas discharge tube D3 are connected to an external CAT4 edge gateway, one end of the resettable fuse F1 is connected to one end of the gas discharge tube D3, and the other end is connected to one end of the transient suppression diode TVS2; one end of the resettable fuse F2 is connected to the The other end of the gas discharge tube D3 is connected, and the other end is connected to the other end of the transient suppression diode TVS2; one end of the transient suppression diode TVS2 is grounded through the transient suppression diode TVS1, and the other end of the transient suppression diode TVS2 is grounded through the transient suppression diode TVS3, and the other end of the transient suppression diode TVS2 is also connected to the voltage 3.3V through the resistor R9; the resistor R4 is connected in parallel with the transient suppression diode TVS2, and the resistor R2 is connected in parallel with the transient suppression diode TVS1;
[0022] The fifth pin of the transceiver U2 is grounded, the sixth pin of the transceiver U2 is connected to one end of the resistor R4, the seventh pin of the transceiver U2 is connected to the other end of the resistor R4, the eighth pin of the transceiver U2 is connected to the voltage 3.3V, and the eighth pin of the transceiver U2 is also grounded via the capacitor C1; the first pin of the transceiver U2 is connected to the single-chip microcomputer via the resistor R5, the second pin of the transceiver U2 is grounded via the resistor R13, the third pin of the transceiver U2 is connected to its second pin, the third pin of the transceiver U2 is connected to the single-chip microcomputer via the resistor R6, and the fourth pin of the transceiver U2 is connected to the single-chip microcomputer via the resistor R8.
[0023] The beneficial effect of adopting the above further solution is that the surge pulse can be quickly consumed, the subsequent communication circuit and the core control unit circuit can be protected, and the signal can be accurately transmitted to the single-chip microcomputer. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 This is a module block diagram of an LED smart street light controller of the utility model;
[0025] Figure 2 This is a circuit diagram of the power management unit of the utility model;
[0026] Figure 3 This is a circuit schematic diagram of the signal output unit of the utility model;
[0027] Figure 4 This is a circuit schematic diagram of the communication unit of the utility model.
[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0029] 1. Power management unit, 101. Surge protection circuit, 102. BUCK step-down circuit, 103. LDO circuit;
[0030] 2. Signal output unit, 3. Single chip microcomputer, 4. Address management unit, 5. Communication unit, 6. Constant current dimming power supply, 7. CAT4 edge gateway. DETAILED DESCRIPTION
[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0032] like Figure 1 As shown, a LED smart street lamp controller includes a power management unit 1, a signal output unit 2, a single-chip microcomputer 3, an address management unit 4 and a communication unit 5, wherein the signal end of the single-chip microcomputer 3 is respectively connected to the signal end of the address management unit 4 and the signal end of the communication unit 5, and the signal end of the communication unit 5 is connected to an external CAT4 edge gateway 7; the signal end of the single-chip microcomputer 3 is also connected to the signal output unit 2, and the signal output unit 2 is connected to an external constant current dimming power supply 6; the input end of the power management unit 1 is connected to the constant current dimming power supply 6, and the output end of the power management unit 1 is connected to the single-chip microcomputer 3.
[0033] When this embodiment is specifically applied, the constant current dimming power supply 6 is connected to the mains, and the output electric energy of the constant current dimming power supply 6 is converted by the power management unit 1 to obtain 3.3V electric energy with less power noise and ripple to power the single-chip microcomputer; the single-chip microcomputer 3 adopts the single-chip microcomputer of model STM32G030 as the main control chip, and establishes communication with the CAT4 edge gateway 7 through the communication unit 5 and the 485 bus. The CAT4 edge gateway is connected to the background cloud service, radar detection or ambient illumination sensor. After the CAT4 edge gateway receives the control information of the background cloud service, the control information is transmitted to the single-chip microcomputer 3 through the communication unit 5. The single-chip microcomputer 3 outputs a PWM signal to the signal output unit 2, and the signal output unit 2 amplifies the amplitude of the PWM signal and transmits it to the constant current dimming power supply 6. The constant current dimming power supply 6 adjusts the electric energy output to the street lamp according to the PWM signal, thereby realizing remote control of the street lamp;
[0034] In addition, radar detection or ambient illumination sensors can be used to sense the surrounding environment, generate sensing signals and transmit them to the microcontroller 3 through the CAT4 edge gateway 7 and the communication unit 5. The microcontroller 3 then generates a PWM signal, and uses the PWM signal to control the street lights through the signal output unit 2 and the constant current dimming power supply 6.
[0035] The address management unit 4 is mainly composed of a DIP switch, which cooperates with the single-chip microcomputer 3 for control, and can realize functions such as communication address allocation and lamp testing, which is convenient for on-site installation and debugging.
[0036] This embodiment realizes local strategy and time management, lamp switching and dimming control through the coordinated operation of the power management unit 1, the signal output unit 2, the single-chip computer 3, the address management unit 4, the communication unit 5, the constant current dimming power supply 6 and the CAT4 edge gateway 7. It can adjust the brightness according to the lighting needs of different road sections, and can also cooperate with the CAT4 edge gateway 7 to detect the traffic conditions at the intersection and then control the street lights; it can save power energy consumption to the greatest extent while meeting the standard lighting requirements, and its energy saving rate can be as high as 40%-50%; the use of digital dimming technology can achieve a smooth transition of street lamp brightness, avoid safety hazards caused by instantaneous strong light illumination, and also reduce the impact on the power system, effectively extending its service life.
[0037] In the above embodiment, if Figure 2 As shown, the power management unit 1 includes a surge protection circuit 101, a BUCK buck circuit 102 and an LDO circuit 103, the input end of the surge protection circuit 101 is connected to the constant current dimming power supply 6, the output end of the surge protection circuit 101 is connected to the BUCK buck circuit 102, the BUCK buck circuit 102 is connected to the LDO circuit 103, and the LDO circuit 103 is connected to the single chip computer 3.
[0038] The power management unit 1 composed of the 12V auxiliary power provided by the constant current dimming power supply 6, the surge protection circuit 101, the BUCK step-down circuit 102 and the LDO circuit 103 adopts a DC-DC and LDO combination to provide a safe and stable power supply for the single chip computer 3.
[0039] In the above embodiment, if Figure 2 As shown, the surge protection circuit 101 includes a varistor R24, a resettable fuse F3-F4 and a transient suppression diode TVS6, the varistor R24, the two ends of the varistor R24 are respectively connected to VIN+ and VIN- of the constant current dimming power supply 6, one end of the resettable fuse F3 is connected to one end of the varistor R24, the other end of the resettable fuse F3 is connected to one end of the transient suppression diode TVS6, one end of the resettable fuse F4 is connected to the other end of the varistor R24, and the other end of the resettable fuse F4 is connected to the other end of the transient suppression diode TVS6.
[0040] The surge protection circuit 101 is divided into three levels of protection. The first level is the varistor R24 absorbing the surge pulse in the line. The second level is the resettable fuse F3 and the resettable fuse F4. When the surge pulse passes through the resettable fuse F3 and the resettable fuse F4, the resistance of the resettable fuse F3 and the resettable fuse F4 increases, further hindering the surge signal from being transmitted downward. The third pole is the transient suppression diode TVS6. When the high-voltage pulse passes through the line, the transient suppression diode TVS6 is quickly turned on, thereby accelerating the action of the resettable fuse F3 and the resettable fuse F4 of the second level protection, effectively preventing the surge signal induced in the line caused by thunderstorm weather from damaging the subsequent circuit.
[0041] In the above embodiment, if Figure 2 As shown, the BUCK step-down circuit 102 includes a Schottky diode D2, a Schottky diode D6, a resistor R18, a resistor R22, a resistor R25, capacitors C10-C13, an electrolytic capacitor C15, a capacitor C16 and a power management chip U4, the positive electrode of the Schottky diode D2 is connected to the self-recovery fuse F3, and the negative electrode of the Schottky diode D2 is connected to the fifth pin of the power management chip U4; one end of the capacitor C13 is connected to the negative electrode of the Schottky diode D2, and the other end is connected to the self-recovery fuse F4;
[0042] One end of the resistor R22 is connected to the fifth pin of the power management chip U4, and the other end is connected to the fourth pin of the power management chip U4; the first pin of the power management chip U4 is connected to its sixth pin via the capacitor C10, the second pin of the power management chip U4 is connected to the capacitor C13, the second pin of the power management chip U4 is also grounded, and the second pin of the power management chip U4 is also connected to the positive electrode of the Schottky diode D6; the cathode of the Schottky diode D6 is connected to the sixth pin of the power management chip U4, and the cathode of the Schottky diode D6 is also connected to one end of the resistor R18 via the inductor L1, and the other end of the resistor R18 is connected to the third pin of the power management chip U4; the capacitor C11 is connected in parallel with the resistor R18; one end of the resistor R25 is connected to the third pin of the power management chip U4, and the other end of the resistor R25 is connected to the second pin of the power management chip U4;
[0043] One end of the capacitor C12 is connected to the resistor R18 and the inductor L1, and the other end is connected to the other end of the resistor R25. The electrolytic capacitor C15 is connected in parallel with the capacitor C12; and the capacitor C16 is connected in parallel with the capacitor C12.
[0044] The BUCK step-down circuit 102 converts the input voltage into 10V, and the output 10V voltage is divided by resistors R18 and R25 as feedback, and is input to the power management chip U4 through the third pin of the power management chip U4. The power management chip U4 adjusts the power supply so that the power supply can be output stably.
[0045] In the above embodiment, Figure 2 As shown, the LDO circuit 103 includes a voltage stabilizing chip U5, an electrolytic capacitor C17, a capacitor C18 and a TVS diode D10. The first pin of the voltage stabilizing chip U5 is connected to the second pin of the power management chip U4, the second pin of the voltage stabilizing chip U5 is connected to the fourth pin thereof, the third pin of the voltage stabilizing chip U5 is connected to the resistor R18 and the inductor L1, and the fourth pin of the voltage stabilizing chip U5 is connected to the first pin thereof via the electrolytic capacitor C17; the capacitor C18 is connected in parallel with the electrolytic capacitor C17; and the TVS diode D10 is connected in parallel with the capacitor C18.
[0046] In order to obtain a stable power supply with lower ripple, the high power supply rejection ratio of LDO is used to effectively suppress the voltage fluctuations caused by the frequent operation of the switching tube in the DC-DC circuit. After further filtering by the post-stage capacitor, a 3.3V power supply with very small ripple is obtained to power the microcontroller.
[0047] In the above embodiment, Figure 3 As shown, the signal output unit 2 includes a resistor R19, a resistor R20, a resistor R27, a resistor R29, a resistor R36, a resistor R37, a capacitor C19, a resettable fuse F6, a transistor Q1, a MOS tube Q2, a transient suppression diode TVS4, a gas discharge tube D4 and an LED1, one end of the resistor R27 is connected to the signal output end of the single-chip computer 3, the other end of the resistor R27 is connected to the base of the transistor Q1, and the capacitor C19 is connected in parallel with the resistor R27; the base of the transistor Q1 is grounded via the resistor R37, and the base of the transistor Q1 is also connected to the resistor R19; the collector of the transistor Q1 is connected to the MOS tube The gate of the MOS tube is connected, the collector of the transistor Q1 is also connected to the drain of the MOS tube through resistors R20 and R36, and the emitter of the transistor Q1 is grounded; the drain of the MOS tube is grounded through resistor R29 and LED1; the source of the MOS tube is grounded; one end of the transient suppression diode TVS4 is connected to the drain of the MOS tube, and the other end of the transient suppression diode TVS4 is grounded; one end of the self-recovery fuse F6 is connected to the drain of the MOS tube, and the other end is connected to the constant current dimming power supply 6; one end of the gas discharge tube D4 is connected to the self-recovery fuse F6, and the other end of the gas discharge tube D4 is grounded.
[0048] In order to reduce the attenuation of the dimming signal during transmission in the line, which causes uncontrollable problems, the amplitude of the PWM dimming signal input by the constant current dimming power supply 6 is required to be 10V. Therefore, the signal output unit 2 is used to convert the PWM signal with an amplitude of 3.3V output by the single-chip computer 3 into a PWM signal with an output amplitude of 10V; the signal output unit 2 adopts a MOS tube open-drain output mode, and controls the working state of the MOS tube Q2 through the transistor Q1. The capacitor C19 is an acceleration capacitor. When PWM1 is at a high level, since the voltage across the capacitor C19 cannot change suddenly, the high-level pulse is instantly added to the right side of the capacitor C19. At this time, the Vbe of the transistor Q1 is greater than 0.7V, so that the transistor Q1 is quickly turned on; when PWM1 is at a low level, a negative voltage pulse quickly appears on the right side of the capacitor C19, which offsets the charge of the base of the transistor Q1 and makes the transistor Q1 turn off quickly.
[0049] The transient suppression diode TVS4, the resettable fuse F6, and the gas discharge tube D4 form the output interface surge protection circuit. The gas discharge tube D4 serves as the first level of protection, the resettable fuse F6 serves as the second level of protection, and the transient suppression diode TVS4 serves as the third level of protection. When a surge pulse impacts the output signal line, the gas discharge tube D4 quickly breaks down and conducts, discharging the energy in the line. The remaining surge signal is quickly consumed when passing through the transient suppression diode TVS4. At this time, the resettable fuse F6 also starts to act, and the resistance becomes larger to further prevent the surge pulse from entering the subsequent circuit, thereby playing a protective role.
[0050] In the above embodiment, if Figure 4 As shown, the communication unit 5 includes a gas discharge tube D3, a resettable fuse F1-F2, a transient suppression diode TVS1-TVS3, a resistor R2, a resistor R4, a resistor R5, a resistor R6, a resistor R8, a resistor R9 and a transceiver U2, both ends of the gas discharge tube D3 are connected to an external CAT4 edge gateway 7, one end of the resettable fuse F1 is connected to one end of the gas discharge tube D3, and the other end is connected to one end of the transient suppression diode TVS2; one end of the resettable fuse F2 is connected to the The other end of the gas discharge tube D3 is connected, and the other end is connected to the other end of the transient suppression diode TVS2; one end of the transient suppression diode TVS2 is grounded through the transient suppression diode TVS1, and the other end of the transient suppression diode TVS2 is grounded through the transient suppression diode TVS3, and the other end of the transient suppression diode TVS2 is also connected to the voltage 3.3V through the resistor R9; the resistor R4 is connected in parallel with the transient suppression diode TVS2, and the resistor R2 is connected in parallel with the transient suppression diode TVS1;
[0051] The fifth pin of the transceiver U2 is grounded, the sixth pin of the transceiver U2 is connected to one end of the resistor R4, the seventh pin of the transceiver U2 is connected to the other end of the resistor R4, the eighth pin of the transceiver U2 is connected to the voltage 3.3V, and the eighth pin of the transceiver U2 is also grounded via the capacitor C1; the first pin of the transceiver U2 is connected to the single-chip microcomputer 3 via the resistor R5, the second pin of the transceiver U2 is grounded via the resistor R13, the third pin of the transceiver U2 is connected to its second pin, the third pin of the transceiver U2 is connected to the single-chip microcomputer 3 via the resistor R6, and the fourth pin of the transceiver U2 is connected to the single-chip microcomputer 3 via the resistor R8.
[0052] The communication unit 5 is provided with a three-stage surge protection circuit, the first stage is a gas discharge tube D3. When a high-voltage pulse appears in the line of the communication unit 5, the gas discharge tube D3 will be broken down and turned on to absorb most of the pulse energy. The second stage is a resettable fuse F1 and a resettable fuse F2. The third stage is a transient suppression diode TVS1, a transient suppression diode TVS2 and a transient suppression diode TVS3. When the residual pulse energy passes through the transient suppression diode TVS1, the transient suppression diode TVS2 and the transient suppression diode TVS3, the TVS tube is quickly turned on, accelerating the action of the second-stage resettable fuse F1 and the resettable fuse F2, so that the resistance of the resettable fuse F1 and the resettable fuse F2 increases rapidly, blocking the remaining surge pulse from continuing to pass through the subsequent circuit. At the same time, the transient suppression diode TVS1, the transient suppression diode TVS2 and the transient suppression diode TVS3 can also quickly consume the surge pulse passing through it, thereby protecting the subsequent communication circuit and the core control unit circuit.
[0053] The transceiver U2 receives the signal sent by the external CAT4 edge gateway 7 through the three-level surge protection circuit, and then the transceiver U2 transmits the signal to the microcontroller 3.
[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. An LED smart street light controller, characterized in that: The invention comprises a power management unit (1), a signal output unit (2), a single chip microcomputer (3), an address management unit (4) and a communication unit (5), wherein the signal end of the single chip microcomputer (3) is respectively connected to the signal end of the address management unit (4) and the signal end of the communication unit (5), and the signal end of the communication unit (5) is connected to an external CAT4 edge gateway (7); the signal end of the single chip microcomputer (3) is also connected to the signal output unit (2), and the signal output unit (2) is connected to an external constant current dimming power supply (6); the input end of the power management unit (1) is connected to the constant current dimming power supply (6), and the output end of the power management unit (1) is connected to the single chip microcomputer (3).
2. The LED smart street light controller according to claim 1, characterized in that: The power management unit (1) comprises a surge protection circuit (101), a BUCK voltage reduction circuit (102) and an LDO circuit (103); the input end of the surge protection circuit (101) is connected to the constant current dimming power supply (6); the output end of the surge protection circuit (101) is connected to the BUCK voltage reduction circuit (102); the BUCK voltage reduction circuit (102) is connected to the LDO circuit (103); and the LDO circuit (103) is connected to the single chip computer (3).
3. The LED smart street light controller according to claim 2, characterized in that: The surge protection circuit (101) comprises a varistor R24, a resettable fuse F3-F4 and a transient suppression diode TVS6, wherein the varistor R24 has two ends respectively connected to VIN+ and VIN- of the constant current dimming power supply (6), one end of the resettable fuse F3 is connected to one end of the varistor R24, the other end of the resettable fuse F3 is connected to one end of the transient suppression diode TVS6, one end of the resettable fuse F4 is connected to the other end of the varistor R24, and the other end of the resettable fuse F4 is connected to the other end of the transient suppression diode TVS6.
4. The LED smart street light controller according to claim 3, characterized in that: The BUCK step-down circuit (102) comprises a Schottky diode D2, a Schottky diode D6, a resistor R18, a resistor R22, a resistor R25, capacitors C10-C13, an electrolytic capacitor C15, a capacitor C16 and a power management chip U4, wherein the positive electrode of the Schottky diode D2 is connected to the self-recovery fuse F3, and the negative electrode of the Schottky diode D2 is connected to the fifth pin of the power management chip U4; one end of the capacitor C13 is connected to the negative electrode of the Schottky diode D2, and the other end is connected to the self-recovery fuse F4; One end of the resistor R22 is connected to the fifth pin of the power management chip U4, and the other end is connected to the fourth pin of the power management chip U4; the first pin of the power management chip U4 is connected to its sixth pin via the capacitor C10, the second pin of the power management chip U4 is connected to the capacitor C13, the second pin of the power management chip U4 is also grounded, and the second pin of the power management chip U4 is also connected to the positive electrode of the Schottky diode D6; the cathode of the Schottky diode D6 is connected to the sixth pin of the power management chip U4, and the cathode of the Schottky diode D6 is also connected to one end of the resistor R18 via the inductor L1, and the other end of the resistor R18 is connected to the third pin of the power management chip U4; the capacitor C11 is connected in parallel with the resistor R18; one end of the resistor R25 is connected to the third pin of the power management chip U4, and the other end of the resistor R25 is connected to the second pin of the power management chip U4; One end of the capacitor C12 is connected to the resistor R18 and the inductor L1, and the other end is connected to the other end of the resistor R25. The electrolytic capacitor C15 is connected in parallel with the capacitor C12; and the capacitor C16 is connected in parallel with the capacitor C12.
5. The LED smart street light controller according to claim 4, characterized in that: The LDO circuit (103) comprises a voltage stabilizing chip U5, an electrolytic capacitor C17, a capacitor C18 and a TVS diode D10, wherein a first pin of the voltage stabilizing chip U5 is connected to a second pin of the power management chip U4, a second pin of the voltage stabilizing chip U5 is connected to a fourth pin thereof, a third pin of the voltage stabilizing chip U5 is connected to the resistor R18 and the inductor L1, and a fourth pin of the voltage stabilizing chip U5 is connected to a first pin thereof via the electrolytic capacitor C17; the capacitor C18 is connected in parallel to the electrolytic capacitor C17; and the TVS diode D10 is connected in parallel to the capacitor C18.
6. The LED smart street light controller according to claim 4, characterized in that: The signal output unit (2) comprises a resistor R19, a resistor R20, a resistor R27, a resistor R29, a resistor R36, a resistor R37, a capacitor C19, a resettable fuse F6, a transistor Q1, a MOS tube Q2, a transient suppression diode TVS4, a gas discharge tube D4 and an LED1, one end of the resistor R27 is connected to the signal output end of the single chip computer (3), the other end of the resistor R27 is connected to the base of the transistor Q1, and the capacitor C19 is connected in parallel with the resistor R27; the base of the transistor Q1 is grounded via the resistor R37, and the base of the transistor Q1 is also connected to the resistor R19; the collector of the transistor Q1 is connected to the MOS tube The gate of the MOS tube is connected, the collector of the transistor Q1 is also connected to the drain of the MOS tube via resistors R20 and R36, and the emitter of the transistor Q1 is grounded; the drain of the MOS tube is grounded via resistor R29 and LED1; the source of the MOS tube is grounded; one end of the transient suppression diode TVS4 is connected to the drain of the MOS tube, and the other end of the transient suppression diode TVS4 is grounded; one end of the self-resetting fuse F6 is connected to the drain of the MOS tube, and the other end is connected to the constant current dimming power supply (6); one end of the gas discharge tube D4 is connected to the self-resetting fuse F6, and the other end of the gas discharge tube D4 is grounded.
7. The LED smart street light controller according to claim 6, characterized in that: The communication unit (5) comprises a gas discharge tube D3, resettable fuses F1-F2, transient suppression diodes TVS1-TVS3, resistors R2, R4, R5, R6, R8, R9 and a transceiver U2, both ends of the gas discharge tube D3 are connected to an external CAT4 edge gateway (7), one end of the resettable fuse F1 is connected to one end of the gas discharge tube D3, and the other end is connected to one end of the transient suppression diode TVS2; one end of the resettable fuse F2 is connected to the The other end of the gas discharge tube D3 is connected, and the other end is connected to the other end of the transient suppression diode TVS2; one end of the transient suppression diode TVS2 is grounded through the transient suppression diode TVS1, and the other end of the transient suppression diode TVS2 is grounded through the transient suppression diode TVS3, and the other end of the transient suppression diode TVS2 is also connected to the voltage 3.3V through the resistor R9; the resistor R4 is connected in parallel with the transient suppression diode TVS2, and the resistor R2 is connected in parallel with the transient suppression diode TVS1; The fifth pin of the transceiver U2 is grounded, the sixth pin of the transceiver U2 is connected to one end of the resistor R4, the seventh pin of the transceiver U2 is connected to the other end of the resistor R4, the eighth pin of the transceiver U2 is connected to a voltage of 3.3V, and the eighth pin of the transceiver U2 is also grounded via a capacitor C1; the first pin of the transceiver U2 is connected to the single-chip computer (3) via a resistor R5, the second pin of the transceiver U2 is grounded via a resistor R13, the third pin of the transceiver U2 is connected to its second pin, the third pin of the transceiver U2 is connected to the single-chip computer (3) via a resistor R6, and the fourth pin of the transceiver U2 is connected to the single-chip computer (3) via a resistor R8.