CN102032523A - Energy-saving LED (light-emitting diode) street lamp - Google Patents

Abstract

The invention discloses an energy-saving LED street lamp, which comprises a lamp body, which is provided with a row × b column of LEDs, where a≥b; an LED drive circuit for driving the LED to emit light, a photosensitive circuit and a controller, and an LED drive circuit. Both the circuit and the photosensitive sensing circuit are electrically connected to the controller, and the LED driving circuit is controlled by the controller, and is characterized in that: it also includes a clock module electrically connected to the controller, and the controller outputs the signal representing the ambient illuminance and the clock according to the photosensitive sensing circuit. The signal representing the time output by the module controls the LED driving circuit. The present invention adopts a control method combining light control and time control, which is more energy-saving. When there is extreme weather such as sudden darkness at noon, the present invention can immediately respond and turn on the LED street lamp, thereby reducing the inconvenience caused by the extreme weather to people's lives.

Description

An energy-saving LED street lamp

technical field

The invention relates to an LED street lamp.

Background technique

With the continuous consumption of energy and the increasing scarcity of resources, the international call for energy saving and consumption reduction is getting louder and louder. my country's outdoor road lighting accounts for about 30% of the total lighting electricity consumption, which is closely related to people's production and life. As an important application of outdoor lighting, LED street lights have the following advantages:

1. The service life of high-power LED street lamps is long, up to 50,000-100,000 hours;

2. The uniformity of the light irradiation surface is controllable, and it can be completely uniform in the target area in theory, which can also avoid the waste of light in the phenomenon of "lighting under the light" of traditional light sources;

3. High color rendering index and high energy-saving efficiency. Usually, 120W LED street lights can replace 400W sodium lamps.

The control of traditional lighting street lamps adopts the manual closing method, that is, the operator closes the switch in the evening to turn on the street lights, and the operator opens the switch in the morning to turn off the street lights. In order to free the operator from the heavy work of closing and closing the gate, an automatic control method based on time points is adopted. In the evening, the time trigger outputs a control signal to turn on the street lights, and in the morning the time trigger outputs a control signal. Signal to turn off street lights. In order to make road lighting more humane, a photoelectric intelligent control method appeared later, which senses the ambient light intensity through a photosensitive device. When the light intensity value is lower than a certain illumination value, the street lamp is turned on. , turn off the street lights.

Utility model ZL200920309046.6 discloses an LED street lamp with an intelligent light control circuit. In addition to the LED drive circuit and the LED module, the LED street lamp also includes an intelligent light control circuit connected to the LED drive circuit. The intelligent light control circuit includes a photosensitive sensing circuit, a smart chip control circuit and a smart chip power supply circuit. The external input DC voltage VIN passes through the smart chip power supply circuit, and outputs a voltage suitable for the smart chip control circuit at its output. The smart chip control circuit starts to work under this voltage, and analyzes and processes the voltage signal transmitted from the photosensitive sensor circuit. Then send a control signal to control the LED drive circuit, and then control the work of the LED module, so that it can provide a suitable lighting mode according to the external light conditions, saving energy. The utility model adds an intelligent light control circuit to the traditional LED street lamp lighting circuit, so that when the external brightness is less than 2lx, the LED street lamp is automatically turned on, and the external brightness is greater than 10lx, and the LED street lamp is automatically turned off. Necessary waste saves energy.

However, the above-mentioned LED street lamps with intelligent light control circuits only adopt intelligent light control, and can only be fully on or fully off.

Contents of the invention

The object of the present invention is to provide an energy-saving LED street lamp that combines light control and time control to address the shortcomings of the prior art.

The technical scheme that realizes the object of the present invention is as follows:

An energy-saving LED street lamp, comprising a lamp body, in which there are a row x b columns of LEDs, where a≥b; an LED drive circuit for driving the LED to emit light, a light-sensitive sensor circuit and a controller, an LED drive circuit and a light-sensitive sensor The circuits are all electrically connected to the controller, and the LED drive circuit is controlled by the controller, which is characterized in that: it also includes a clock module electrically connected to the controller, and the controller outputs the signal representing the ambient illuminance according to the light-sensitive sensing circuit and the signal output by the clock module. The time signal controls the LED drive circuit.

Further, the LEDs in row a×column b are divided into n LED groups, each LED group includes the same number of LEDs, and the value of n is 2 to 6. The LED drive circuit includes n outputs, and the output between each output is Independently, drive n LED groups respectively.

Further, a is an integer multiple of n, all the LEDs in row i belong to group j, j=i mod n, and the value of i is 1~a. In the formula, mod is a remainder operator, such as 1mod 4=1, 7mod 4=3, 12mod 4=0.

Further, it also includes a memory electrically connected to the controller. The memory is used to store control parameters, such as the first illuminance threshold, the second illuminance threshold, the third illuminance threshold, the fourth illuminance threshold, the first time threshold, the second time threshold and other parameters, these parameters can be set according to actual needs and stored in memory.

Further, n=4, that is, it is divided into 4 LED groups, and the method for controlling the LED driving circuit by the controller is as follows:

(A1) If the ambient illuminance is less than the first illuminance threshold, the controller controls the 4 outputs of the LED drive circuit to output rated current so as to fully turn on the energy-saving LED street lamp, and then go to step (B5); otherwise, go to the next step;

(A2) If the ambient illuminance is less than the second illuminance threshold, the controller controls the output current of 3 of the LED drive circuits to be the rated current and the current of the other 1 output is 0, so as to turn on the 3 LED groups and go to the step (A1); otherwise go to the next step;

(A3) If the ambient illuminance is less than the third illuminance threshold, the controller controls the output current of 2 of the LED drive circuits to be the rated current and the current of the other 2 outputs is 0, so as to turn on the 2 LED groups and go to the step (A1); otherwise go to the next step;

(A4) If the ambient illuminance is less than the fourth illuminance threshold, the controller controls the output current of one of the LED drive circuits to be the rated current and the output current of the other three outputs is 0, thereby turning on one LED group and turning to the step (A1); otherwise go to step (C8);

(B5) If the ambient illuminance is greater than the fourth illuminance threshold, proceed to step (C8); otherwise proceed to the next step;

(B6) If the time has reached the first time domain value, the controller controls the current of 2 outputs of the LED drive circuit to be 0 and the current of the other 2 outputs remains unchanged, so that only 2 LED groups are turned on, and enter Go to the next step; otherwise, return to step (B5); usually the first time threshold is set between 22:00 and 24:00;

(B7) Enter the next step until the ambient illuminance is greater than the fourth illuminance threshold;

(C8) The controller controls the currents of the 4 outputs of the LED drive circuit to be all 0, thereby fully turning off the energy-saving LED street lamps, and turning to step (A1);

Wherein, the first illuminance threshold<the second illuminance threshold<the third illuminance threshold<the fourth illuminance threshold.

In order to maintain the balance of the lighting time of each LED group, there is a storage unit Sj for storing the lighting time of the jth LED group in the memory, and its value is recorded as Vj, Sj occupies 1 or 2 bytes, and the jth The operation of Vj=Vj+1 is performed every time the LED group is turned on for one hour; one byte is 8 bits, if Sj occupies 4 bits, then the value of Vj is between 0 and 15, When Vj=15, according to the usual operation rules, after executing Vj=Vj+1, Vj=0, because the cyclic base is 16 too small, so it is not suitable, if Sj occupies 1 byte, then the cyclic base is 256, According to the following control method, the lighting time of each LED group can be maintained in balance; the control method of lighting energy-saving LED street lights is as follows:

(1) In the fully closed state or fully turned on state: If one LED group is turned on, find a minimum value in V1, V2, V3 and V0, and multiple values in V1, V2, V3 and V0 If the values are both the minimum value, then take one of the minimum values, according to the program segment Vmin=V0; Zmin=0; for(j=1; j<4; j++){IF Vmin>Vj{Vmin=Vj; Zmin=j ;}} You can take out a serial number corresponding to the minimum value and turn on the LED group; if you turn on 2 LED groups, if the minimum value of one of V1, V2, V3 and V0 is V1 or V3, turn on the second LED group Group 1 and Group 3, otherwise turn on Group 2 and Group 0; if turn on 3 LED groups, find a maximum value among V1, V2, V3 and V0, if multiple values are the same maximum Value, take one of the maximum values, turn on the other 3 groups other than this LED group;

(2) When 1 LED group is turned on: if 1 LED group is turned on, keep this group turned on; The principle of "and then turn on one LED group; the principle of "and is even" is that the sum of the serial numbers of the two LED groups that are turned on is an even number, so that the illumination on the ground is basically uniform; if three LED groups are turned on, then Find a maximum value of the turn-on time corresponding to the 3 unlit LED groups, and turn on the other 3 LED groups other than the LED group corresponding to the maximum value;

(3) When 2 LED groups are turned on: if 1 LED group is turned on, compare the turn-on time of the turned-on LED group, and keep the LED group corresponding to a smaller value turned on. If two LED groups The lighting time of the groups is equal, that is, it is considered to be the same as the smaller value, and any one of them can be used, which is easy to realize with program automatic control; if 3 LED groups are turned on, compare the lighting time of the unlit LED group The LED group corresponding to a larger value is not turned on. If the turn-on time of the two LED groups is equal, it is considered to be the larger value, and any one of them can be used, which is easy to realize by automatic control of the program;

(4) When 3 LED groups are turned on: if 1 LED group is turned on, compare the turn-on time of the turned-on LED group, and keep the LED group corresponding to the minimum value turned on; if turn on 2 LED groups For the LED group, according to the principle of "harmony as a pair", keep 2 LED groups on among the 3 LED groups that have been turned on.

In order to further save energy and save the cost of laying cables, the energy-saving LED street lamp of the present invention also includes a solar power supply module. All are powered by solar power supply modules.

Further, the controller also controls the LED driving circuit according to the electricity stored in the solar power supply module.

Further, n=4, the control method of the controller to the LED driving circuit is as follows:

(A1) If the ambient illuminance is less than the first illuminance threshold, the controller controls the 4 outputs of the LED drive circuit to output rated current so as to fully turn on the energy-saving LED street lamp, and then go to step (B5); otherwise, go to the next step;

(A2) If the ambient illuminance is less than the second illuminance threshold, the controller controls the output current of 3 of the LED drive circuits to be the rated current and the current of the other 1 output is 0, so as to turn on the 3 LED groups and go to the step (A1); otherwise go to the next step;

(A3) If the ambient illuminance is less than the third illuminance threshold, the controller controls the output current of 2 of the LED drive circuits to be the rated current and the current of the other 2 outputs is 0, so as to turn on the 2 LED groups and go to the step (A1); otherwise go to the next step;

(A4) If the ambient illuminance is less than the fourth illuminance threshold, the controller controls the output current of one of the LED drive circuits to be the rated current and the output current of the other three outputs is 0, thereby turning on one LED group and turning to the step (A1); otherwise go to step (C8);

(B5) If the ambient illuminance is greater than the fourth illuminance threshold, proceed to step (C8); otherwise proceed to the next step;

(B5.1) If the time has reached the second time domain value, go to the next step; otherwise, return to step (B5); usually the second time threshold is set between 20:00 and 21:00;

(B5.2) Predict whether the stored electricity of the solar power supply module is sufficient, and if sufficient, proceed to the next step; otherwise, proceed to step (D9);

(B6.1) When the waiting time reaches the first time domain value, the controller controls the current of 2 outputs of the LED drive circuit to be 0 while the current of the other 2 outputs remains unchanged, so that only 2 LED groups are turned on, and enter to the next step;

(B7) Enter the next step until the ambient illuminance is greater than the fourth illuminance threshold;

(C8) The controller controls the currents of the 4 outputs of the LED drive circuit to be all 0, thereby fully turning off the energy-saving LED street lamps, and turning to step (A1);

(D9) Predict if one LED group is turned on at the first time threshold, whether it is enough electricity, if it is enough electricity, go to the next step; otherwise go to step (D11);

(D10) When the waiting time reaches the first time domain value, the controller controls the current of 2 outputs of the LED drive circuit to be 0 and the current of the other 2 outputs remains unchanged, so that only 2 LED groups are turned on and enter the next step. step;

(D11) Predict whether to turn on 1 LED group from the current time, whether it is enough power, if it is enough power, go to the next step; otherwise go to step (D14);

(D12) It is predicted that only one LED group will be turned on at time X, which is just enough power to enter the next step;

(D13) Waiting time reaches time X, and enters the next step;

(D14) The controller controls the output current of one of the LED drive circuits to be the rated current and the current of the other three outputs to be 0, thereby turning on one LED group;

(D15) When the ambient illuminance is greater than the second illuminance threshold, the controller controls the currents of the 4 outputs of the LED drive circuit to be all 0, thereby fully turning off the energy-saving LED street lamps and entering the next step;

(D16) When the ambient illuminance is greater than the fourth illuminance threshold, proceed to step (A1);

Wherein, the first illuminance threshold<the second illuminance threshold<the third illuminance threshold<the fourth illuminance threshold.

In step (B5.2), to predict whether the electricity stored in the solar power supply module is sufficient, a fixed third time threshold can be set, such as 6 o'clock in the morning; {(first time threshold-second time threshold)×full power+ (Third time threshold+24-first time threshold)×full power×0.5} can predict the power needed for that night, and compare it with the power stored in the solar power supply module to determine whether it is sufficient. However, due to the large deviation in the time of sunrise and sunset in spring, summer, autumn and winter, the fixed third time threshold will cause a large deviation. Therefore, in order to make the prediction more accurate, the controller records the environmental illuminance of the energy-saving LED street lamp. And stored in the memory, it includes at least the following data: the moment when the illuminance threshold rises from low to high in the early morning of the same day and the fourth illuminance threshold rises from low to high in the early morning of the same day, the controller predicts solar energy according to the ambient illuminance in the early morning of the same day. Whether the power stored in the power supply module is sufficient. Generally speaking, the ambient illuminance in the early morning of the next day is basically the same as the ambient illuminance in the early morning of the same day, so it is enough to use the ambient illuminance of the day to predict. {(first time threshold-second time threshold)×full power+(the moment when the illuminance threshold rises from low to high in the early morning of the day+24-first time threshold)×full power×0.5} to predict the night The required power is compared with the power stored in the solar power supply module to determine whether it is sufficient.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention adopts a control method combining light control and time control, which is more energy-saving.

(2) The present invention divides the LEDs in the LED street lamp into multiple groups to make the control more flexible.

(3) In an extreme situation, such as sudden darkness at noon, the simple and easy control method provided by the present invention can immediately turn on the LED street lamp, thereby reducing the inconvenience caused by the extreme weather to people's lives.

(4) Divide the LEDs in the LED street lamp into multiple groups evenly by row, so that the illuminance of the LED street lamp on the ground is basically uniform.

(5) The present invention is driven by a solar power supply module, which can save the time and cost of laying cables, does not need to consume electric energy of the grid, and has remarkable energy-saving benefits.

(6) When the solar power supply module is used to drive, light control, time control and combined with the power stored in the solar power supply module are used to control the on and off of each LED group of the LED street lamp; so that the power of the solar power supply module in continuous rainy weather is insufficient Timely protection of street lamps to achieve the best social benefits.

Description of drawings

Fig. 1 is a kind of block diagram schematic diagram of the present invention;

Fig. 2 is another kind of block diagram schematic diagram of the present invention;

Fig. 3 is a schematic structural diagram of an LED street lamp body; in the figure, 0: the 0th LED group; 1: the 1st LED group; 2: the 2nd LED group; 3: the 3rd LED group; 6: Light body; 7: LED;

Fig. 4 is a kind of concrete control flowchart;

Fig. 5 is one of another kind of concrete control flowchart;

Fig. 6 is another specific control flowchart No. 2.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Example 1

As shown in Figure 1, an energy-saving LED street lamp includes an LED drive circuit for driving LEDs to emit light, a light-sensitive sensor circuit, a memory, and a controller. The LED drive circuit, memory, and light-sensitive sensor circuit are all electrically connected to the controller, and the LED driver The circuit is controlled by the controller and also includes a clock module electrically connected to the controller. The controller controls the LED driving circuit according to the signal representing the ambient illuminance output by the photosensitive circuit and the signal representing time output by the clock module. The LED drive circuit includes n independent outputs, the LED street lamp is divided into n LED groups, and each independent output drives one LED group. In this embodiment, n is 4.

As shown in Figure 3, a lamp body 6 has 12 rows×10 columns of LEDs built-in, if the power of each LED is 1W, the power of the entire LED street lamp is 120W; the LED7 is divided into 4 groups by row, the first, 5th, 9th row is the first group, 2nd, 6th, 10th row is the 2nd group, 3rd, 7th, 11th row is the 3rd group, 4th, 8th, 12th row is the 0th group.

As shown in Figure 4, the illuminance threshold and time threshold can be set according to actual needs. In this embodiment, the first illuminance threshold is 1lx, the second illuminance threshold is 5lx, the third illuminance threshold is 10lx, and the fourth illuminance threshold is 15lx, the first time threshold is 23 o'clock; the control method of the controller to the LED drive circuit is as follows:

(A1), if the ambient illuminance is less than 1lx, the controller controls the 4 outputs of the LED drive circuit to output the rated current so as to fully turn on the energy-saving LED street lamp, and then go to step (B5); otherwise go to the next step;

(A2) If the ambient illuminance is less than 5lx, the controller controls the output current of 3 channels of the LED drive circuit to be the rated current and the output current of the other 1 channel is 0, so as to turn on the 3 LED groups and go to step (A1) ; Otherwise go to the next step;

(A3) If the ambient illuminance is less than 10lx, the controller controls the output current of 2 of the LED drive circuits to be the rated current and the current of the other 2 outputs is 0, so as to turn on the 2 LED groups and go to step (A1) ; Otherwise go to the next step;

(A4) If the ambient illuminance is less than 15lx, the controller controls the output current of one of the LED drive circuits to be the rated current and the output current of the other three to be 0, so as to turn on one LED group and go to step (A1) ; Otherwise, go to step (C8);

(B5) If the ambient illuminance is greater than 15lx, proceed to step (C8); otherwise proceed to the next step;

(B6) If the time has reached 23:00, the controller controls the current of 2 outputs of the LED drive circuit to be 0 and the current of the other 2 outputs remains unchanged, so that only 2 LED groups are turned on, and the next step is entered ; Otherwise return to step (B5);

(B7) When the ambient illuminance is greater than 15lx, proceed to the next step;

(C8) The controller controls the currents of the 4 outputs of the LED driving circuit to be all 0, so that the energy-saving LED street lamps are all turned off, and the process goes to step (A1).

The memory is provided with a storage unit Sj for storing the lighting time of the jth LED group, and its value is recorded as Vj, and Sj occupies 1 byte. When the lighting time of the jth LED group passes for 1 hour, execute Vj=Vj +1 operation; the control method of Qiliang energy-saving LED street lamp is as follows:

(1) In the fully closed state or fully turned on state: If one LED group is turned on, find a minimum value among V1, V2, V3 and V0, and turn on the LED group; if two LED groups are turned on LED group, if the minimum value of one of V1, V2, V3 and V0 is V1 or V3, turn on group 1 and group 3, otherwise turn on group 2 and group 0; if turn on 3 LEDs group, find a maximum value in V1, V2, V3 and V0, and turn on the other 3 groups other than this LED group;

(2) When 1 LED group is turned on: if 1 LED group is turned on, keep this group turned on; "Principle to turn on 1 LED group; if 3 LED groups are turned on, then find a maximum value of the turn-on time corresponding to the 3 unlit LED groups, and turn on the LED group corresponding to the maximum value. The other 3 LED groups;

(3) When 2 LED groups are turned on: if 1 LED group is turned on, compare the turn-on time of the turned-on LED group, and keep the LED group corresponding to a smaller value turned on; if turned on 3 If there are two LED groups, compare the turn-on time of the non-turn-on LED group, and keep the LED group corresponding to a larger value from not turn on;

(4) When 3 LED groups are turned on: if 1 LED group is turned on, compare the turn-on time of the turned-on LED group, and keep the LED group corresponding to the minimum value turned on; if turn on 2 LED groups For the LED group, according to the principle of "harmony as a pair", keep 2 LED groups on among the 3 LED groups that have been turned on.

Example 2

Compared with Embodiment 1, the difference is that this embodiment adds a solar power supply module, and its structural block diagram is shown in Figure 2. The solar power supply module is electrically connected to the LED drive circuit, and the solar power supply module is electrically connected to the controller. Energy-saving LED All parts of the street lamp that need power are powered by solar power supply modules. The controller also controls the LED driving circuit according to the electricity stored in the solar power supply module.

In this embodiment, the first illuminance threshold is 1lx, the second illuminance threshold is 5lx, the third illuminance threshold is 10lx, the fourth illuminance threshold is 15lx, the first time threshold is 23 o'clock, and the second time threshold is 20 o'clock; As shown in Figure 5 and Figure 6, the controller controls the LED drive circuit as follows:

(A1) If the ambient illuminance is less than 1lx, the controller controls the 4 outputs of the LED drive circuit to output the rated current so as to fully turn on the energy-saving LED street lamp, and then go to step (B5); otherwise go to the next step;

(A2) If the ambient illuminance is less than 5lx, the controller controls the output current of 3 channels of the LED drive circuit to be the rated current and the output current of the other 1 channel is 0, so as to turn on the 3 LED groups and go to step (A1) ; Otherwise go to the next step;

(A3) If the ambient illuminance is less than 10lx, the controller controls the output current of 2 of the LED drive circuits to be the rated current and the current of the other 2 outputs is 0, so as to turn on the 2 LED groups and go to step (A1) ; Otherwise go to the next step;

(A4) If the ambient illuminance is less than 15lx, the controller controls the output current of one of the LED drive circuits to be the rated current and the output current of the other three to be 0, so as to turn on one LED group and go to step (A1) ; Otherwise, go to step (C8);

(B5) If the ambient illuminance is greater than 15lx, proceed to step (C8); otherwise proceed to the next step;

(B5.1) If the time has reached 20 o'clock, go to the next step; otherwise, return to step (B5);

(B5.2) Predict whether the stored electricity of the solar power supply module is sufficient, and if sufficient, proceed to the next step; otherwise, proceed to step (D9);

(B6.1) When the waiting time reaches 23 o'clock, the controller controls the output current of 2 channels of the LED drive circuit to be 0 and the current of the other 2 channels remains unchanged, so that only 2 LED groups are turned on, and then enters the next step ;

(B7) When the ambient illuminance is greater than 15lx, proceed to the next step;

(C8) The controller controls the currents of the 4 outputs of the LED drive circuit to be all 0, thereby fully turning off the energy-saving LED street lamps, and turning to step (A1);

(D9) Predict if 1 LED group is turned on at 23 o'clock, whether it is enough power, if it is enough power, go to the next step; otherwise go to step (D11);

(D10) When the waiting time reaches 23 o'clock, the controller controls the output current of 2 channels of the LED drive circuit to be 0 and the current of the other 2 channels remains unchanged, so that only 2 LED groups are turned on, and the next step is entered;

(D11) Predict whether to turn on 1 LED group from the current time, whether it is enough power, if it is enough power, go to the next step; otherwise go to step (D14);

(D12) It is predicted that only one LED group will be turned on at time X, which is just enough power to enter the next step;

(D13) Waiting time reaches time X, and enters the next step;

(D14) The controller controls the output current of one of the LED drive circuits to be the rated current and the current of the other three outputs to be 0, thereby turning on one LED group;

(D15) When the ambient illuminance is greater than 5 lx, the controller controls the current of the 4 outputs of the LED drive circuit to be all 0, thereby fully turning off the energy-saving LED street lamps and entering the next step;

(D16) Go to step (A1) until the ambient illuminance is greater than 15lx.

In order to predict more accurately, the controller records the environmental illuminance of energy-saving LED street lamps and saves them in the memory. When the height rises to the fourth illuminance threshold, it will be more accurate for the controller to predict whether the power stored in the solar power supply module is sufficient or not according to the ambient illuminance.

In step (B5.2), it is predicted whether the electricity stored in the solar power supply module is sufficient, and the prediction is made according to the moment when the illuminance threshold rises from low to high in the early morning of the day to the fourth illuminance threshold, in steps (D9), (D11), (D12) , then according to the moment when the illumination rises from low to high in the early morning of the day to the second illuminance threshold, such prediction results will be relatively accurate.

The control method of turning on the energy-saving LED street lamp in this embodiment is the same as that in Embodiment 1.

Claims (10)

1. An energy-saving LED street lamp, comprising a lamp body, the lamp body is provided with a row × b column of LEDs, a≥b; comprising an LED drive circuit for driving the LED to emit light, a photosensitive circuit and a controller, an LED drive circuit and a light The sensitive sensing circuits are all electrically connected to the controller, and the LED drive circuit is controlled by the controller. The signal representing the time controls the LED driving circuit. 2. The energy-saving LED street lamp according to claim 1, characterized in that: the LEDs in row a x column b are divided into n LED groups, each LED group includes the same number of LEDs, and the value of n is 2-6. The LED driving circuit includes n outputs, each output is independent, and drives n LED groups respectively. 3. The energy-saving LED street lamp according to claim 2, characterized in that: a is an integer multiple of n, the LEDs in row i all belong to group j, j=i mod n, and the value of i is 1 to a. 4. The energy-saving LED street lamp according to claim 3, further comprising a memory electrically connected to the controller. 5. The energy-saving LED street lamp according to claim 4, characterized in that: n=4, the controller controls the LED drive circuit as follows: (A1) If the ambient illuminance is less than the first illuminance threshold, the controller controls the 4 outputs of the LED drive circuit to output rated current so as to fully turn on the energy-saving LED street lamp, and then go to step (B5); otherwise, go to the next step; (A2) If the ambient illuminance is less than the second illuminance threshold, the controller controls the output current of 3 of the LED drive circuits to be the rated current and the current of the other 1 output is 0, so as to turn on the 3 LED groups and go to the step (A1); otherwise go to the next step; (A3) If the ambient illuminance is less than the third illuminance threshold, the controller controls the output current of 2 of the LED drive circuits to be the rated current and the current of the other 2 outputs is 0, so as to turn on the 2 LED groups and go to the step (A1); otherwise go to the next step; (A4) If the ambient illuminance is less than the fourth illuminance threshold, the controller controls the output current of one of the LED drive circuits to be the rated current and the output current of the other three outputs is 0, thereby turning on one LED group and turning to the step (A1); otherwise go to step (C8); (B5) If the ambient illuminance is greater than the fourth illuminance threshold, proceed to step (C8); otherwise proceed to the next step; (B6) If the time has reached the first time domain value, the controller controls the current of 2 outputs of the LED drive circuit to be 0 and the current of the other 2 outputs remains unchanged, so that only 2 LED groups are turned on, and enter Go to the next step; otherwise return to step (B5); (B7) Enter the next step until the ambient illuminance is greater than the fourth illuminance threshold; (C8) The controller controls the currents of the 4 outputs of the LED drive circuit to be all 0, thereby fully turning off the energy-saving LED street lamps, and turning to step (A1); Wherein, the first illuminance threshold<the second illuminance threshold<the third illuminance threshold<the fourth illuminance threshold. 6. The energy-saving LED street lamp according to claim 5, characterized in that: the memory is provided with a storage unit sj for storing the lighting time of the jth LED group, its value is recorded as Vj, and Sj occupies 1 or 2 words Section, when the lighting time of the jth LED group passes by 1 hour, the operation of Vj=Vj+1 is executed; the control method of turning on the energy-saving LED street lamp is as follows: (1) In the fully closed state or fully turned on state: If one LED group is turned on, find a minimum value among V1, V2, V3 and V0, and turn on the LED group; if two LED groups are turned on LED group, if the minimum value of one of V1, V2, V3 and V0 is V1 or V3, turn on group 1 and group 3, otherwise turn on group 2 and group 0; if turn on 3 LEDs group, find a maximum value in V1, V2, V3 and V0, and turn on the other 3 groups other than this LED group; (2) When 1 LED group is turned on: if 1 LED group is turned on, keep this group turned on; "Principle to turn on 1 LED group; if 3 LED groups are turned on, then find a maximum value of the turn-on time corresponding to the 3 unlit LED groups, and turn on the LED group corresponding to the maximum value. The other 3 LED groups; (3) When 2 LED groups are turned on: if 1 LED group is turned on, compare the turn-on time of the turned-on LED group, and keep the LED group corresponding to a smaller value turned on; if turned on 3 If there are two LED groups, compare the turn-on time of the non-turn-on LED group, and keep the LED group corresponding to a larger value from not turn on; (4) When 3 LED groups are turned on: if 1 LED group is turned on, compare the turn-on time of the turned-on LED group, and keep the LED group corresponding to the minimum value turned on; if turn on 2 LED groups For the LED group, according to the principle of "harmony as a pair", keep 2 LED groups on among the 3 LED groups that have been turned on. 7. The energy-saving LED street lamp according to claim 4, characterized in that: it includes a solar power supply module, the solar power supply module is electrically connected to the LED drive circuit, the solar power supply module is electrically connected to the controller, and all components of the energy-saving LED street lamp that need power supply All are powered by solar power supply modules. 8. The energy-saving LED street lamp according to claim 7, wherein the controller also controls the LED driving circuit according to the electricity stored in the solar power supply module. 9. The energy-saving LED street lamp according to claim 8, characterized in that: n=4, the controller controls the LED drive circuit as follows: (A1) If the ambient illuminance is less than the first illuminance threshold, the controller controls the 4 outputs of the LED drive circuit to output rated current so as to fully turn on the energy-saving LED street lamp, and then go to step (B5); otherwise, go to the next step; (A2) If the ambient illuminance is less than the second illuminance threshold, the controller controls the output current of 3 of the LED drive circuits to be the rated current and the current of the other 1 output is 0, so as to turn on the 3 LED groups and go to the step (A1); otherwise go to the next step; (A3) If the ambient illuminance is less than the third illuminance threshold, the controller controls the output current of 2 of the LED drive circuits to be the rated current and the current of the other 2 outputs is 0, so as to turn on the 2 LED groups and go to the step (A1); otherwise go to the next step; (A4) If the ambient illuminance is less than the fourth illuminance threshold, the controller controls the output current of one of the LED drive circuits to be the rated current and the output current of the other three outputs is 0, thereby turning on one LED group and turning to the step (A1); otherwise go to step (C8); (B5) If the ambient illuminance is greater than the fourth illuminance threshold, proceed to step (C8); otherwise proceed to the next step; (B5.1) If the time has reached the second time domain value, go to the next step; otherwise, return to step (B5); (B5.2) Predict whether the stored electricity of the solar power supply module is sufficient, and if sufficient, proceed to the next step; otherwise, proceed to step (D9); (B6.1) When the waiting time reaches the first time domain value, the controller controls the current of 2 outputs of the LED drive circuit to be 0 while the current of the other 2 outputs remains unchanged, so that only 2 LED groups are turned on, and enter to the next step; (B7) Enter the next step until the ambient illuminance is greater than the fourth illuminance threshold; (C8) The controller controls the currents of the 4 outputs of the LED drive circuit to be all 0, thereby fully turning off the energy-saving LED street lamps, and turning to step (A1); (D9) Predict if one LED group is turned on at the first time threshold, whether it is enough electricity, if it is enough electricity, go to the next step; otherwise go to step (D11); (D10) When the waiting time reaches the first time domain value, the controller controls the current of 2 outputs of the LED drive circuit to be 0 and the current of the other 2 outputs remains unchanged, so that only 2 LED groups are turned on and enter the next step. step; (D11) Predict whether to turn on 1 LED group from the current time, whether it is enough power, if it is enough power, go to the next step; otherwise go to step (D14); (D12) It is predicted that only one LED group will be turned on at time X, which is just enough power to enter the next step; (D13) Waiting time reaches time X, and enters the next step; (D14) The controller controls the output current of one of the LED drive circuits to be the rated current and the current of the other three outputs to be 0, thereby turning on one LED group; (D15) When the ambient illuminance is greater than the second illuminance threshold, the controller controls the currents of the 4 outputs of the LED drive circuit to be all 0, thereby fully turning off the energy-saving LED street lamps and entering the next step; (D16) When the ambient illuminance is greater than the fourth illuminance threshold, proceed to step (A1); Wherein, the first illuminance threshold<the second illuminance threshold<the third illuminance threshold<the fourth illuminance threshold. 10. The energy-saving LED street lamp according to claim 9, characterized in that: the controller records the ambient illuminance of the energy-saving LED street lamp and saves it in the memory, which at least includes the following data: from low to high in the early morning of the day to the second At the moment of the illuminance threshold and the moment when the illuminance threshold rises from low to high in the early morning of the day to the fourth illuminance threshold, the controller predicts whether the power stored in the solar power supply module is sufficient according to the ambient illuminance.

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