LED street lamp control circuit

Abstract

An LED street lamp control circuit disclosed by the present application comprises a control chip, a communication module, a first driving module and a plurality of second driving modules, and by setting the first driving module and the plurality of second driving modules, a first power supply signal can be provided for a first signal end of each LED street lamp in a preset LED street lamp combination based on the first driving module, and a second power supply signal can be provided for a second signal end of each LED street lamp in the preset LED street lamp combination. And the second power supply signal is provided for the non-first signal ends of the two LED street lamps corresponding to the second driving module based on the second driving module, so that the LED street lamps can be lightened in a high-speed cross flickering manner, the power consumption of the LED street lamps is reduced, and the control efficiency of the LED street lamps is improved.

Description

Technical Field

[0001] The present application relates to the technical field of street lamp lighting, and in particular to an LED street lamp control circuit. Background Art

[0002] Street lights are luminous lighting systems on roads, streets and public squares. They usually start to light up at night or after dark and go out after dawn. As a solid-state light source, LED has the characteristics of long life and low energy consumption, and is a green light source. As the technology of high-power LED driving becomes more and more mature, LED has been widely promoted and applied in the field of street lighting.

[0003] At present, the existing LED street lights generally adopt single-lamp control, that is, each LED street light needs to be equipped with a separate driving circuit for control. When working, the LED street lights need to be lit or extinguished one by one. Due to the large number of street lights, the lighting, extinguishing and detection work is relatively cumbersome, resulting in low control efficiency of LED street lights. Utility Model Content

[0004] An embodiment of the present application provides an LED street lamp control circuit. By setting a first driving module and multiple second driving modules, a first power supply signal can be provided to the first signal end of each LED street lamp in a preset LED street lamp combination based on the first driving module, and a second power supply signal can be provided to the non-first signal ends of two LED street lamps corresponding to itself based on the second driving module, so as to improve the control efficiency of the LED street lamp.

[0005] The LED street lamp control circuit comprises: a control chip, connected to a communication module, a first driving module and a plurality of second driving modules, the control chip is used to receive a control instruction of a host computer, and send a first driving signal to the first driving module, and send a second driving signal to the second driving module, the first driving module corresponds to each LED street lamp in a preset LED street lamp combination, and every two LED street lamps in the preset LED street lamp combination correspond to one second driving module; a communication module, connected to a host computer and the control chip, and used to establish a communication connection between the host computer and the control chip, so that the control chip obtains the control instruction; the first driving module, connected to the control chip and the first signal end of each LED street lamp in the preset LED street lamp combination, is used to receive the first driving signal, and send a first power supply signal to the first signal end of each LED street lamp; the second driving module, connected to the control chip and the non-first signal end of the two LED street lamps corresponding to itself, is used to receive the second driving signal, and send a second power supply signal to the non-first signal end of the two LED street lamps corresponding to itself; wherein, one of the anode and the cathode of the LED street lamp is the first signal end, and the other is the non-first signal end, and the first signal ends of the two LED street lamps corresponding to the same second driving module are different.

[0006] By applying the above technical solution, a first driving module and multiple second driving modules are set. Based on the first driving module, a first power supply signal can be provided to the first signal end of each LED street lamp in a preset LED street lamp combination, and based on the second driving module, a second power supply signal can be provided to the non-first signal ends of two LED street lamps corresponding to itself, thereby realizing high-speed cross-flashing to light up the LED street lamps, thereby reducing the power consumption of the LED street lamps and improving the control efficiency. At the same time, since the number of driving modules is less than the number of LED street lamps, it is not necessary to configure a driving circuit for each LED street lamp separately, thereby reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0008] Figure 1 This is a schematic diagram of the structure of an LED street lamp control circuit according to an embodiment of the present application;

[0009] Figure 2 A schematic diagram of a circuit structure adopted by a first driving module and a second driving module in an embodiment of the present application;

[0010] Figure 3 This is a schematic diagram of a first driving module and each second driving module in an embodiment of the present application;

[0011] Figure 4 This is a schematic diagram of connecting each LED street lamp to a first driving module and a second driving module in an embodiment of the present application;

[0012] Figure 5 This is a schematic diagram of the structure of the communication module in the embodiment of the present application;

[0013] Figure 6 This is a schematic diagram of the structure of the control chip of an embodiment of the present application;

[0014] Figure 7 This is a schematic diagram of the driving waveform for lighting up 6 LED street lamps in the embodiment of the present application;

[0015] Figure 8 A schematic diagram of a driving waveform for lighting up the 1st to 5th LED street lamps and extinguishing the 6th LED street lamp in an embodiment of the present application;

[0016] Fig. 9 A schematic diagram of a driving waveform for lighting up the 1st to 4th LED street lamps and extinguishing the 5th to 6th LED street lamps in an embodiment of the present application;

[0017] Fig.10 A schematic diagram of driving waveforms for lighting up the 1st to 3rd LED street lamps and extinguishing the 4th to 6th LED street lamps in an embodiment of the present application;

[0018] Fig.11 A schematic diagram of driving waveforms for lighting up the 1st to 2nd LED street lamps and extinguishing the 3rd to 6th LED street lamps in an embodiment of the present application;

[0019] Fig.12 A schematic diagram of driving waveforms for lighting up the first LED street lamp and extinguishing the second to sixth LED street lamps in an embodiment of the present application;

[0020] Fig.13 Schematic diagram of driving waveforms for turning off 6 LED street lamps in an embodiment of the present application. DETAILED DESCRIPTION

[0021] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0022] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present application will occur to those skilled in the art.

[0023] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0024] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0025] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art will be able to readily implement many other equivalent forms of the present application.

[0026] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

[0027] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present application. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.

[0028] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.

[0029] An LED street lamp control circuit of an embodiment of the present application, by setting a first driving module and multiple second driving modules, can provide a first power supply signal to the first signal end of each LED street lamp in a preset LED street lamp combination based on the first driving module, and provide a second power supply signal to the non-first signal ends of two LED street lamps corresponding to itself based on the second driving module, thereby realizing high-speed cross-flashing lighting of the LED street lamps, thereby reducing the power consumption of the LED street lamps and improving the control efficiency. At the same time, since the number of driving modules is less than the number of LED street lamps, it is not necessary to configure a driving circuit for each LED street lamp separately, thereby reducing the cost.

[0030] like Figure 1 As shown, the circuit includes:

[0031] The control chip 10 is connected to the communication module 20, the first driving module 40 and the plurality of second driving modules 50, and is used to receive the control instruction of the host computer 30, and send a first driving signal to the first driving module 40, and send a second driving signal to the second driving module 50, wherein the first driving module 40 corresponds to each LED street lamp in the preset LED street lamp combination, and each two LED street lamps in the preset LED street lamp combination correspond to one second driving module 50;

[0032] The communication module 20 is connected to the host computer 30 and the control chip 10, and is used to establish a communication connection between the host computer 30 and the control chip 10 so that the control chip 10 obtains a control instruction;

[0033] The first driving module 40 is connected to the control chip 10 and the first signal end of each LED street lamp in the preset LED street lamp combination, and is used to receive the first driving signal and send a first power supply signal to the first signal end of each LED street lamp;

[0034] The second driving module 50 is connected to the control chip 10 and the non-first signal terminals of the two LED street lamps corresponding to itself, and is used to receive the second driving signal and send a second power supply signal to the non-first signal terminals of the two LED street lamps corresponding to itself;

[0035] Among them, one of the anode and the cathode of the LED street lamp is a first signal terminal, and the other is a non-first signal terminal. The first signal terminals of the two LED street lamps corresponding to the same second driving module 50 are different.

[0036] In this embodiment, the first driving module 40 and the plurality of second driving modules 50 send out mutually matching control signals to drive the corresponding LED street lamps. The preset LED street lamp combination includes a preset number of LED street lamps, the first driving module 40 corresponds to each LED street lamp in the preset LED street lamp combination, and every two LED street lamps in the preset LED street lamp combination correspond to one second driving module 50. Those skilled in the art can set the number of preset LED street lamp combinations and the number of street lamps in each preset LED street lamp combination as needed, and the number of second driving modules 50 is not limited to Figure 1 3 are shown.

[0037] For example, if the preset LED street light combination includes 6 LED street lights, the street lights in the preset LED street light combination are controlled by 1 first driving module 40 and 3 second driving modules 50, that is, 4 driving modules are used to drive 6 LED street lights. If the preset LED street light combination includes 8 LED street lights, the street lights in the preset LED street light combination are controlled by 1 first driving module 40 and 4 second driving modules 50, that is, 5 driving modules are used to drive 8 LED street lights. It can be seen that in the embodiment of the present application, for every additional second driving module 50, 2 more LED street lights can be controlled, and the number of driving modules is less than the number of LED street lights.

[0038] The host computer 30 sends a control instruction to the control chip 10 through the communication module 20. The control instruction can light up all LED street lights in the preset LED street light combination, or light up some LED street lights in the preset LED street light combination, or turn off all LED street lights in the preset LED street light combination. In some embodiments, the control instruction can be generated by the host computer 30 based on one or more combinations of collected parameters such as ambient brightness, time, radar detection data, infrared detection data, image detection data, etc.

[0039] After receiving the control instruction, the control chip 10 sends a first drive signal to the first drive module 40, so that the first drive module 40 outputs a first power supply signal to the first signal end of each LED street lamp in the preset LED street lamp combination, and the first power supply signal is formed by the first high level and the first low level that appear alternately at a preset time interval, and the preset time interval is less than the duration of human visual persistence. At the same time, the control chip 10 sends a second drive signal to the second drive module 50, so that the current second drive module 50 outputs a corresponding signal to the non-first signal end of the target LED street lamp that needs to be lit, so that the anode of the target LED street lamp satisfies the positive power supply and the cathode satisfies the negative power supply, so that it is lit. Among them, if the two current LED street lamps corresponding to the current second drive module 50 are both target LED street lamps, the second power supply signal is the first low level when the first power supply signal is the first high level, and is the first high level when the first power supply signal is the first low level. If one of the two current LED street lamps corresponding to the current second drive module 50 is the target LED street lamp and the other is a non-target LED street lamp, the second power supply signal is a continuous first high level, or a continuous first low level.

[0040] The LED street lamp control circuit in this embodiment includes a control chip 10, a communication module 20, a first drive module 40 and a plurality of second drive modules 50. The first drive module 40 corresponds to each LED street lamp in a preset LED street lamp combination. Every two LED street lamps in the preset LED street lamp combination correspond to a second drive module 50. The first drive module 40 is connected to the control chip 10 and the first signal end of each LED street lamp in the preset LED street lamp combination. The second drive module 50 is connected to the control chip 10 and the non-first signal end of the two LED street lamps corresponding to itself. The control chip 10 can receive the control instruction of the host computer 30 through the communication module 20, and control the first drive module 40 and the plurality of second drive modules 50. On this basis, the first power supply signal and the second power supply signal can be set to a first high level and a first low level that appear alternately at a preset time interval, and the preset time interval is less than the duration of human visual retention, so that high-speed cross-flash lighting of the LED street lamp can be achieved, thereby reducing the power consumption of the LED street lamp and improving the control efficiency. At the same time, since the number of drive modules is less than the number of LED street lamps, it is not necessary to configure a drive circuit for each LED street lamp separately, thereby reducing the cost.

[0041] In some embodiments of the present application, the first driving module 40 and the second driving module 50 adopt the same circuit structure, such as Figure 2 As shown, the circuit structure includes:

[0042] A switch unit 41, wherein a first end of the switch unit 41 is connected to the control chip 10, a second end of the switch unit 41 is connected to a first end of the output unit 42, and the switch unit 41 is used to generate a switch signal according to the first drive signal or the second drive signal;

[0043] The output unit 42, the second end of the output unit 42 is the output end of the first power supply signal or the second power supply signal, and the output unit 42 is used to generate the first power supply signal or the second power supply signal according to the switch signal.

[0044] In this embodiment, for the first driving module 40, the switching unit 41 receives the first driving signal issued by the control chip 10, and generates a switching signal according to the first driving signal, and the switching signal enables the output unit 42 to generate a first power supply signal. For the second driving module 50, the switching unit 41 receives the second driving signal issued by the control chip 10, and generates a switching signal according to the second driving signal, and the switching signal enables the output unit 42 to generate a second power supply signal, thereby improving the reliability of the first driving module 40 and the second driving module 50.

[0045] In some embodiments of the present application, Figure 2 As shown, the switch unit 41 includes a first resistor R1, a second resistor R2, a third resistor R3 and a transistor Q3, one end of the first resistor R1 is the first end of the switch unit 41, the other end of the first resistor R1 is connected to one end of the second resistor R2, one end of the third resistor R3 and the base of the transistor Q3, the other end of the second resistor R2 is connected to the first voltage, the other end of the third resistor R3 and the emitter of the transistor Q3 are grounded, and the collector of the transistor Q3 is the second end of the switch unit 41.

[0046] In this embodiment, the switch signal is generated by turning on and off the transistor Q3. Taking the first drive module 40 receiving the first drive signal as an example, the first drive signal enters the transistor Q3 through the first resistor R1. If the first drive signal is at a low level, the transistor Q3 is turned off. If the first drive signal is at a high level, the transistor Q3 is turned on, so that the switch unit 41 can reliably generate the switch signal. In the specific application scenario of this application, the first voltage can be 3.3V.

[0047] In some embodiments of the present application, the output unit 42 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first MOS transistor Q1, and a second MOS transistor Q2, one end of the fourth resistor R4, one end of the fifth resistor R5, and one end of the sixth resistor R6 are connected to the first end of the output unit 42, the other end of the fourth resistor R4 and the source of the first MOS transistor Q1 are connected to the second voltage, the other end of the fifth resistor R5 is connected to the gate of the first MOS transistor Q1, the drain of the first MOS transistor Q1 and the drain of the second MOS transistor Q2 are connected to the second end of the output unit 42, the other end of the sixth resistor R6 is connected to the gate of the second MOS transistor Q2, and the source of the second MOS transistor Q2 is grounded. In a specific application scenario of the present application, the second voltage can be 12V.

[0048] In this embodiment, the first power supply signal or the second power supply signal is generated by turning on and off the first MOS tube Q1 and the second MOS tube Q2. Taking the first driving module 40 as an example, if the transistor Q3 is turned off, the first MOS tube Q1 is turned off, the second MOS tube Q2 is turned on, and the first power supply signal output by OUT1 is a first low level. At this time, the LED street lamp connected to OUT1 through the cathode satisfies the negative pole power supply. If the transistor Q3 is turned on, the first MOS tube Q1 is turned on, the second MOS tube Q2 is turned off, and the first power supply signal output by OUT1 is a first high level. At this time, the LED street lamp connected to OUT1 through the anode satisfies the positive pole power supply. When the first power supply signal satisfies the negative pole power supply of the LED street lamp, if the second power supply signal that satisfies the positive pole power supply of the LED street lamp is input, the LED street lamp is lit, or when the first power supply signal satisfies the positive pole power supply of the LED street lamp, if the second power supply signal that satisfies the negative pole power supply of the LED street lamp is input, the LED street lamp is lit, and because the preset time interval is less than the duration of the visual retention of the human eye, the human eye sees that the LED street lamp is in a lit state.

[0049] In some embodiments of the present application, the circuit further includes a connector, and the first driving module 40 and each second driving module 50 are connected to each LED street lamp in a preset LED street lamp combination through the connector.

[0050] In this embodiment, the first driving module 40 and each second driving module 50 are ensured to be reliably connected to each LED street lamp in the preset LED street lamp combination by providing a plug-in connector. Figure 4 As shown, the connector includes a docking socket P2 and a docking plug P1.

[0051] In some embodiments of the present application, the communication module 20 uses RS485 communication, the communication module 20 is connected to the host computer 30 through the I / O control port, and is connected to the control chip 10 through the serial communication port. Figure 5 As shown, the communication module 20 includes:

[0052] The level conversion chip U2 is used for level conversion to establish a communication connection between the host computer 30 and the control chip 10;

[0053] The protection unit 21 is connected between the I / O control port and the level conversion chip U2 to prevent overvoltage and overcurrent from entering the level conversion chip U2;

[0054] The access unit 22 is connected between the serial communication port and the level conversion chip U2, and is used to connect the control chip 10 to the level conversion chip U2.

[0055] In this embodiment, the communication module 20 uses RS485 communication and is connected to an RS485 to Ethernet module for Internet communication, so that the host computer 30 can remotely control or set the control chip 10. The control command sent from the host computer 30 enters the level conversion chip U2 through the protection unit 21, and enters the control chip 10 through the access unit 22 after level conversion, thereby improving the reliability of the communication module 20.

[0056] In some embodiments of the present application, Figure 5 As shown, the protection unit 21 includes a three-terminal gas discharge tube EA1, a first thermistor PTC1, a second thermistor PTC2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first transient voltage suppression tube TVS1, a second transient voltage suppression tube TVS2, a third transient voltage suppression tube TVS3, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, an inductor L1 and a common mode inductor L2, wherein,

[0057] The first end and the second end of the three-terminal gas discharge tube EA1 are connected to the I / O control port, the third end of the three-terminal gas discharge tube EA1 is grounded, one end of the first thermistor PTC1 is connected to the first end of the three-terminal gas discharge tube EA1, the other end of the first thermistor PTC1 is connected to one end of the seventh resistor R7, one end of the eighth resistor R8, one end of the first transient voltage suppression tube TVS1, one end of the second transient voltage suppression tube TVS1, one end of the first capacitor C1 and the first end of the common mode inductor L2, the other end of the seventh resistor R7, the other end of the first transient voltage suppression tube TVS1, the other end of the first capacitor C1, one end of the second capacitor C2 and one end of the third capacitor C3 are grounded, the other end of the second capacitor C2 and the other end of the third capacitor C3 One end of the inductor L1 is connected to the eighth pin of the level conversion chip U2, the other end of the inductor L1 is connected to the third voltage, one end of the second thermistor PTC2 is connected to the second end of the three-terminal gas discharge tube EA1, the other end of the second thermistor PTC2 is connected to the other end of the eighth resistor R8, one end of the ninth resistor R9, the other end of the second transient voltage suppression tube TVS2, one end of the fourth capacitor C4, one end of the third transient voltage suppression tube TVS3 and the second end of the common-mode inductor L2, the other end of the ninth resistor R9 is connected to the third voltage, the other end of the fourth capacitor C4 and the other end of the third transient voltage suppression tube TVS3 are grounded, and the third end and the fourth end of the common-mode inductor L2 are respectively connected to the seventh pin and the sixth pin of the level conversion chip U2.

[0058] In this embodiment, the three-terminal gas discharge tube EA1 forms a primary protection. When lightning strikes or other surge interference occurs on the RS485 communication line, the surge interference is filtered out to the ground through the three-terminal gas discharge tube EA1, and the overvoltage is greatly weakened at this time. The first thermistor PTC1 and the second thermistor PTC2 are connected in series between the three-terminal gas discharge tube EA1 and the first transient voltage suppressor tube TVS1, the second transient voltage suppressor tube TVS2, and the third transient voltage suppressor tube TVS3 to form a second level of protection. The value of the first thermistor PTC1 and the second thermistor PTC2 can be 10Ω / 2W. The entire circuit presents a large current due to the conduction of the three-terminal gas discharge tube EA1, which causes the first thermistor PTC1 and the second thermistor PTC2 to act immediately, ensuring that the three-terminal gas discharge tube EA1 can be smoothly conducted, ensuring that most of the energy is discharged through the three-terminal gas discharge tube EA1, and limiting the current of the entire circuit within an allowable range; the first transient voltage suppression tube TVS1, the second transient voltage suppression tube TVS2, and the third transient voltage suppression tube TVS3 form a third-level protection circuit, which performs secondary voltage limiting and can clamp the overvoltage after the three-terminal gas discharge tube EA1. The voltage of the back-end circuit is clamped at about 8V, thereby protecting the back-end circuit; the common-mode inductor L2, the first capacitor C1 and the fourth capacitor C4 form a fourth-level protection circuit. The first capacitor C1 and the fourth capacitor C4 provide a low-impedance return path for interference, which can effectively reduce the external common-mode current and filter the external interference at the same time; the common-mode inductor L2 can attenuate common-mode interference, suppress the interference inside the single board and the external interference, improve the anti-interference ability of the controller, and also reduce the external radiation through the 485 signal line.

[0059] In some embodiments of the present application, the access unit 22 includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a first optical coupler O1, a second optical coupler O2 and a third optical coupler O3, wherein:

[0060] One end of the tenth resistor R10, one end of the eleventh resistor R11, and one end of the twelfth resistor R12 are connected to the third voltage, the other end of the tenth resistor R10 is connected to the fourth pin of the level conversion chip U2 and the collector of the phototransistor of the third optocoupler O3, the other end of the eleventh resistor R11 is connected to the third pin and the second pin of the level conversion chip U2 and the collector of the phototransistor of the second optocoupler O2, the other end of the twelfth resistor R12 is connected to the anode of the light-emitting diode of the first optocoupler O1, the cathode of the light-emitting diode of the first optocoupler O1 is connected to the first pin of the level conversion chip U2, one end of the thirteenth resistor R13, one end of the fourteenth resistor R14 The first end and one end of the fifteenth resistor R15 are connected to the first voltage, the other end of the thirteenth resistor R13 is connected to the collector of the phototransistor of the first optocoupler O1, the collector of the phototransistor of the first optocoupler O1 is connected to the control chip 10, the other end of the fourteenth resistor R14 is connected to the anode of the light-emitting diode of the second optocoupler O2, the cathode of the light-emitting diode of the second optocoupler O2 is connected to the control chip 10, the other end of the fifteenth resistor R15 is connected to the anode of the light-emitting diode of the third optocoupler O3, the cathode of the light-emitting diode of the third optocoupler O3 is connected to the control chip 10, and the emitters of the phototransistors in the first optocoupler O1, the second optocoupler O2 and the third optocoupler O3 are all grounded.

[0061] In this embodiment, by providing the first optical coupler O1 , the second optical coupler O2 , and the third optical coupler O3 , electrical isolation between the level conversion chip U2 and the control chip 10 is achieved, thereby improving safety.

[0062] In some embodiments of the present application, the model of the level conversion chip U2 is MAX13488EESA, the model of the three-terminal gas discharge tube EA1 is 3RM090M-5-SS, and the model of the common-mode inductor L2 is B82793S0513N201.

[0063] In some embodiments of the present application, the model of the control chip 10 is STC32G12K128. In a specific application scenario, such as Figure 6 As shown, the control chip 10 adopts STC32G12K128-35I-LQFP48, is connected to the communication module 20 through pins 5, 6 and 7, is connected to the first drive module 40 through pin 33, and is connected to a second drive module 50 through pins 35, 37 and 39 respectively.

[0064] In order to further explain the technical idea of ​​the present application, the technical solution of the present application is now described in combination with specific application scenarios.

[0065] like Figure 4 As shown, the LED street light combination includes six LED street lights D1-D6. Figure 3As shown, one first driving module (corresponding to output terminal OUT1) and three second driving modules (corresponding to output terminals OUT2, OUT3, and OUT4) are used for driving, and each driving module is controlled by a control chip. Figure 6 As shown, the control chip is an MCU of model STC32G12K128-35I-LQFP48. For different lighting modes of street lamps.

[0066] It should be noted that the four driving modules are independent of each other. Although the components in the four driving modules use the same circuit structure, it only means that the circuit structures of the four driving modules are the same, and does not mean that the four driving modules share a set of components.

[0067] The specific process of the cross control method of the LED street lamp is as follows:

[0068] Drive the first drive module: MCU's 33rd pin outputs the first drive signal to the input terminal IO P2.0 of the drive signal of the first drive module. The first drive signal outputs a second high level of 3.3V and a second low level connected to ground every 1ms. When the first drive signal is the second low level (0V), the transistor Q3 is turned off, the voltage at point A is 12V, the first MOS tube Q1 is turned off, the second MOS tube Q2 is turned on, and the output terminal OUT1 of the drive signal outputs the first low level (0V) due to the conduction of the second MOS tube Q2. The negative poles of the first LED street lamp D1, the third LED street lamp D3, and the fifth LED street lamp D5 are grounded, satisfying the negative pole power supply. When the input terminal IO P2.0 of the control signal is at the second high level, the transistor Q3 is turned on, the voltage at point A is 0V, the first MOS tube Q1 is turned on, and the second MOS tube Q2 is turned off. The output terminal OUT1 of the drive signal outputs the first high level (12V) because the first MOS tube Q1 is turned on. The positive poles of the second LED street lamp D2, the fourth LED street lamp D4, and the sixth LED street lamp D6 are connected to 12V to meet the positive pole power supply.

[0069] Case 1: Light up 6 LED street lights.

[0070] When it is necessary to light up 6 LED street lights, while driving the first driver module, the 35, 37, and 39 pins of the MCU synchronously output high and low levels opposite to those of the 33 pin (i.e., the second drive signal). In view of the same working principle of the 4 groups of LED driver modules, OUT2, OUT3, and OUT4 synchronously output high and low levels opposite to those of OUT1. Therefore, when OUT1 is the first low level, the first LED street light D1, the third LED street light D3, and the fifth LED street light D5 are lit. When OUT1 is the first high level, the second LED street light D2, the fourth LED street light D4, and the sixth LED street light D6 are lit. Since the preset time interval of 1ms is less than the duration of human visual retention, the human eye will see that all 6 LED street lights are lit. The output waveforms of OUT1, OUT2, OUT3, and OUT4 are as follows: Figure 7 shown.

[0071] In case 2, the first LED street light D1, the second LED street light D2, the third LED street light D3, the fourth LED street light D4, and the fifth LED street light D5 are turned on, and the sixth LED street light D6 is turned off.

[0072] While driving the first driver module, the MCU's 35th and 37th pins synchronously output high and low levels opposite to those of the 33th pin, that is, output the second control signal, and the MCU's 39th pin outputs a continuous second high level. Given that the working principles of the four groups of LED driver modules are the same, OUT2 and OUT3 synchronously output high and low levels opposite to those of OUT1, and OUT4 continuously outputs the first high level. Therefore, when OUT1 is the first low level, the first LED street light D1, the third LED street light D3, and the fifth LED street light D5 are lit. When OUT1 is the first high level, the second LED street light D2, the fourth LED street light D4, and the sixth LED street light D6 are extinguished. Since the preset time interval of 1ms is less than the duration of human visual retention, the human eye will see that the first LED street light D1, the second LED street light D2, the third LED street light D3, the fourth LED street light D4, and the fifth LED street light D5 are all lit. The output waveforms of OUT1, OUT2, OUT3, and OUT4 control are as follows: Figure 8 shown.

[0073] In case three, the first LED street light D1, the second LED street light D2, the third LED street light D3, and the fourth LED street light D4 are turned on, and the fifth LED street light D5 and the sixth LED street light D6 are turned off.

[0074] While driving the first driver module, the MCU's 35 and 37 pins synchronously output high and low levels opposite to those of the 33 pin, and the MCU's 39 pin synchronously outputs the same high and low levels as the 33 pin. In view of the same working principles of the four groups of LED driver modules, OUT2 and OUT3 synchronously output high and low levels opposite to those of OUT1, and OUT4 continuously outputs the same high and low levels as OUT1. Therefore, when OUT1 is at the first low level, the first LED street light D1 and the third LED street light D3 are lit, and the fifth LED street light D5 is off. When OUT1 is at the first high level, the second LED street light D2 and the fourth LED street light D4 are lit, and the sixth LED street light D6 is off. Since the preset time interval of 1ms is less than the duration of human visual retention, the human eye will see that the first LED street light D1, the second LED street light D2, the third LED street light D3, and the fourth LED street light D4 are all lit. The output waveforms of OUT1, OUT2, OUT3, and OUT4 control are as follows: Fig. 9 shown.

[0075] In case 4, the first LED street light D1, the second LED street light D2, and the third LED street light D3 are turned on, and the fourth LED street light D4, the fifth LED street light D5, and the sixth LED street light D6 are turned off.

[0076] While driving the first driver module, the MCU's 35-pin synchronously outputs the high and low levels opposite to the 33-pin, the MCU's 37-pin continuously outputs the second high level, and the MCU's 39-pin synchronously outputs the same high and low levels as the 33-pin. In view of the same working principle of the four groups of LED driver modules, OUT2 synchronously outputs the high and low levels opposite to OUT1, OUT3 continuously outputs the first high level, and OUT4 continuously outputs the same high and low levels as OUT1. Therefore, when OUT1 is the first low level, the first LED street light D1 and the third LED street light D3 are lit, and the fifth LED street light D5 is off. When OUT1 is the first high level, the second LED street light D2 is lit, and the fourth LED street light D4 and the sixth LED street light D6 are off. Since the preset time interval of 1ms is less than the duration of human visual retention, the human eye will see that the first LED street light D1, the second LED street light D2, and the third LED street light D3 are all lit. The output waveforms of OUT1, OUT2, OUT3, and OUT4 are as follows: Fig.10 shown.

[0077] In case five, the first LED street light D1 and the second LED street light D2 are turned on, and the third LED street light D3, the fourth LED street light D4, the fifth LED street light D5, and the sixth LED street light D6 are turned off.

[0078] While driving the first driver module, the MCU's 35-pin synchronously outputs high and low levels opposite to the 33-pin, and the 37-pin and 39-pin of the MCU synchronously output high and low levels the same as the 33-pin. In view of the same working principle of the four groups of LED driver modules, OUT2 synchronously outputs high and low levels opposite to OUT1, and OUT3 and OUT4 continuously output high and low levels the same as OUT1. Therefore, when OUT1 is the first low level, the first LED street light D1 is on, and the third LED street light D3 and the fifth LED street light D5 are off. When OUT1 is the first high level, the second LED street light D2 is on, and the fourth LED street light D4 and the sixth LED street light D6 are off. Since the preset time interval of 1ms is less than the duration of human visual retention, the human eye will see that the first LED street light D1 and the second LED street light D2 are both on. The output waveforms of OUT1, OUT2, OUT3, and OUT4 are as follows: Fig.11 shown.

[0079] In case five, the first LED street light D1 is turned on, and the second LED street light D2, the third LED street light D3, the fourth LED street light D4, the fifth LED street light D5, and the sixth LED street light D6 are turned off.

[0080] While driving the first driver module, the MCU's 35th pin continuously outputs the second high level, and the MCU's 37th and 39th pins synchronously output the same high and low levels as the 33th pin. In view of the same working principle of the four groups of LED driver modules, OUT2 continuously outputs the first high level, and OUT3 and OUT4 continuously output the same high and low levels as OUT1. Therefore, when OUT1 is the first low level, the first LED street light D1 is on, and the third LED street light D3 and the fifth LED street light D5 are off. When OUT1 is the first high level, the second LED street light D2, the fourth LED street light D4, and the sixth LED street light D6 are off. Since the preset time interval of 1ms is less than the duration of human visual retention, the human eye will see that the first LED street light D1 is lit. The output waveforms of OUT1, OUT2, OUT3, and OUT4 are as follows: Fig.12 shown.

[0081] Case six, turn off 6 LED street lights.

[0082] While driving the first driver module, the MCU's 35th, 37th, and 39th pins synchronously output the same high and low levels as the 33rd pin. Given that the four groups of LED driver modules have the same working principles, OUT2, OUT3, and OUT4 continue to output the same high and low levels as OUT1. Therefore, when OUT1 is at the first low level, the first LED street light, the third LED street light D3, and the fifth LED street light D5 are turned off. When OUT1 is at the first high level, the second LED street light D2, the fourth LED street light D4, and the sixth LED street light D6 are turned off. The output waveforms of OUT1, OUT2, OUT3, and OUT4 are shown in the figure. Fig.13 shown.

[0083] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A LED street light control circuit, characterized in that: The circuit comprises: A control chip, connected to the communication module, the first driving module and the plurality of second driving modules, for receiving control instructions from a host computer, and sending a first driving signal to the first driving module, and sending a second driving signal to the second driving module, wherein the first driving module corresponds to each LED street lamp in a preset LED street lamp combination, and every two LED street lamps in the preset LED street lamp combination correspond to one second driving module; A communication module, connected to the host computer and the control chip, for establishing a communication connection between the host computer and the control chip so that the control chip obtains the control instruction; A first driving module, connected to the control chip and the first signal end of each LED street lamp in the preset LED street lamp combination, for receiving the first driving signal and sending a first power supply signal to the first signal end of each LED street lamp; A second driving module, connected to the control chip and the non-first signal ends of the two LED street lamps corresponding to itself, for receiving the second driving signal and sending a second power supply signal to the non-first signal ends of the two LED street lamps corresponding to itself; Among them, one of the anode and the cathode of the LED street lamp is a first signal terminal, and the other is a non-first signal terminal. The first signal terminals of two LED street lamps corresponding to the same second driving module are different.

2. The LED street lamp control circuit according to claim 1, characterized in that: The first driving module and the second driving module adopt the same circuit structure, and the circuit structure includes: a switch unit, wherein a first end of the switch unit is connected to the control chip, a second end of the switch unit is connected to a first end of the output unit, and the switch unit is used to generate a switch signal according to the first drive signal or the second drive signal; An output unit, wherein the second end of the output unit is an output end of the first power supply signal or the second power supply signal, and the output unit is used to generate the first power supply signal or the second power supply signal according to the switch signal.

3. The LED street light control circuit according to claim 2, characterized in that: The switch unit includes a first resistor, a second resistor, a third resistor and a transistor, one end of the first resistor is the first end of the switch unit, the other end of the first resistor is connected to one end of the second resistor, one end of the third resistor and the base of the transistor, the other end of the second resistor is connected to a first voltage, the other end of the third resistor and the emitter of the transistor are grounded, and the collector of the transistor is the second end of the switch unit.

4. The LED street lamp control circuit according to claim 2, characterized in that: The output unit includes a fourth resistor, a fifth resistor, a sixth resistor, a first MOS tube and a second MOS tube, one end of the fourth resistor, one end of the fifth resistor and one end of the sixth resistor are connected to the first end of the output unit, the other end of the fourth resistor and the source of the first MOS tube are connected to a second voltage, the other end of the fifth resistor is connected to the gate of the first MOS tube, the drain of the first MOS tube and the drain of the second MOS tube are connected to the second end of the output unit, the other end of the sixth resistor is connected to the gate of the second MOS tube, and the source of the second MOS tube is grounded.

5. The LED street light control circuit according to claim 1, characterized in that: The circuit further includes a connector, and the first driving module and each of the second driving modules are connected to each LED street lamp in a preset LED street lamp combination via the connector.

6. The LED street lamp control circuit according to claim 1, characterized in that: The communication module adopts RS485 communication, the communication module is connected to the host computer through the I / O control port, and is connected to the control chip through the serial communication port. The communication module includes: A level conversion chip, used for performing level conversion to establish a communication connection between the host computer and the control chip; A protection unit, connected between the I / O control port and the level conversion chip, for preventing overvoltage and overcurrent from entering the level conversion chip; The access unit is connected between the serial communication port and the level conversion chip, and is used to connect the control chip to the level conversion chip.

7. The LED street light control circuit according to claim 6, characterized in that: The protection unit includes a three-terminal gas discharge tube, a first thermistor, a second thermistor, a seventh resistor, an eighth resistor, a ninth resistor, a first transient voltage suppression tube, a second transient voltage suppression tube, a third transient voltage suppression tube, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, an inductor and a common mode inductor, wherein: The first end and the second end of the three-terminal gas discharge tube are connected to the I / O control port, the third end of the three-terminal gas discharge tube is grounded, one end of the first thermistor is connected to the first end of the three-terminal gas discharge tube, the other end of the first thermistor is connected to one end of the seventh resistor, one end of the eighth resistor, one end of the first transient voltage suppression tube, one end of the second transient voltage suppression tube, one end of the first capacitor and the first end of the common mode inductor, the other end of the seventh resistor, the other end of the first transient voltage suppression tube, the other end of the first capacitor, one end of the second capacitor and one end of the third capacitor are grounded, and the other end of the second capacitor and the other end of the third capacitor are grounded. The first end of the second thermistor is connected to one end of the inductor and the eighth pin of the level conversion chip, the other end of the inductor is connected to a third voltage, one end of the second thermistor is connected to the second end of the three-terminal gas discharge tube, the other end of the second thermistor is connected to the other end of the eighth resistor, one end of the ninth resistor, the other end of the second transient voltage suppression tube, one end of the fourth capacitor, one end of the third transient voltage suppression tube and the second end of the common-mode inductor, the other end of the ninth resistor is connected to the third voltage, the other end of the fourth capacitor and the other end of the third transient voltage suppression tube are grounded, and the third end and the fourth end of the common-mode inductor are respectively connected to the seventh pin and the sixth pin of the level conversion chip.

8. The LED street light control circuit according to claim 7, characterized in that: The access unit includes a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a first optical coupler, a second optical coupler and a third optical coupler, wherein: One end of the tenth resistor, one end of the eleventh resistor and one end of the twelfth resistor are connected to the third voltage, the other end of the tenth resistor is connected to the fourth pin of the level conversion chip and the collector of the phototransistor of the third optocoupler, the other end of the eleventh resistor is connected to the third pin and the second pin of the level conversion chip and the collector of the phototransistor of the second optocoupler, the other end of the twelfth resistor is connected to the anode of the light-emitting diode of the first optocoupler, the cathode of the light-emitting diode of the first optocoupler is connected to the first pin of the level conversion chip, one end of the thirteenth resistor and one end of the fourteenth resistor are connected to the fourth pin of the level conversion chip and the collector of the phototransistor of the third optocoupler, the other end of the twelfth resistor is connected to the anode of the light-emitting diode of the first optocoupler, the cathode of the light-emitting diode of the first optocoupler is connected to the first pin of the level conversion chip, One end of the fifteenth resistor is connected to a first voltage, the other end of the thirteenth resistor is connected to the collector of the phototransistor of the first optocoupler, the collector of the phototransistor of the first optocoupler is connected to the control chip, the other end of the fourteenth resistor is connected to the anode of the light-emitting diode of the second optocoupler, the cathode of the light-emitting diode of the second optocoupler is connected to the control chip, the other end of the fifteenth resistor is connected to the anode of the light-emitting diode of the third optocoupler, the cathode of the light-emitting diode of the third optocoupler is connected to the control chip, and the emitters of the phototransistors in the first optocoupler, the second optocoupler and the third optocoupler are all grounded.

9. The LED street light control circuit according to claim 8, characterized in that: The model of the level conversion chip is MAX13488EESA, the model of the three-terminal gas discharge tube is 3RM090M-5-SS, and the model of the common mode inductor is B82793S0513N201.

10. The LED street light control circuit according to any one of claims 1 to 9, characterized in that: The model of the control chip is STC32G12K128.

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