Intelligent dimming control circuit and method

Abstract

The present invention provides an intelligent dimming control circuit and method, which relates to the technical field of LED lamp control circuit, including a power supply circuit, an MCU controller, a control circuit, and an LED light array; the control circuit includes an RS485 communication unit and a first PWM drive unit; the LED light array includes a signal receiving unit, a second PWM drive unit, and a plurality of LED lamps; the power supply circuit is connected to the MCU controller, the control circuit, and the LED light array; the RS485 communication unit is connected to the communication port of the MCU controller; the first PWM drive unit is connected to the PWM port of the MCU controller; and the signal receiving unit is connected to the first PWM drive unit. The present application has strong anti-interference ability and can adapt to the changes in seasons and weather and accurately control the lighting needs.

Description

Technical Field

[0001] The present invention relates to the technical field of LED lamp control circuits, and in particular to an intelligent dimming control circuit and method. Background Art

[0002] Existing livestock breeding LED lighting fixtures all have fixed brightness output or fixed brightness output within a certain period of time. The former cannot adjust the brightness, while the latter can control the brightness of the LED lighting fixtures by time. These two methods are obviously lacking in adaptability to environmental changes in modern breeding production. For example, they cannot intelligently adapt to problems such as inconsistent day and night lengths caused by seasonal changes, and inconsistent lighting requirements caused by weather changes in a short period of time. They cannot meet customer requirements for lighting and energy saving. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present application provides an intelligent dimming control circuit and method, which has strong anti-interference ability and can adapt to seasonal and weather changes to accurately control lighting needs.

[0004] The technical solution adopted by the present invention to solve its technical problems is: an intelligent dimming control circuit, which is improved in that it includes: a power supply circuit, an MCU controller, a control circuit, and an LED light array; the control circuit includes an RS485 communication unit and a first PWM drive unit; the LED light array includes a signal receiving unit, a second PWM drive unit and a plurality of LED lamps; the power supply circuit is connected to the MCU controller, the control circuit and the LED light array, and is used to convert alternating current into direct current to power the MCU controller, the control circuit and the LED light array; the RS485 communication unit is connected to the communication port of the MCU controller, and is used to convert the RS485 signal into a TTL signal of the MCU controller; the input of the RS485 communication unit is the light data of the light sensor; the first PWM drive unit is connected to the PWM port of the MCU controller, and is used to provide a dimming signal; the signal receiving unit is connected to the first PWM drive unit, and is used to generate a control signal according to the dimming signal; the second PWM drive unit is connected to the signal receiving unit, and is used to adjust the brightness of the LED lamp in response to the dimming signal.

[0005] In the above circuit, the RS485 communication unit includes: two dual-input Schmitt triggers, a transceiver, three capacitors, three resistors and three diodes; the two dual-input Schmitt triggers are respectively connected to the transceiver, and the 8th pin of the transceiver is respectively connected to a high level, a resistor R65, a resistor R69 and one end of a capacitor C47; the other end of the resistor R65 is connected to one end of a resistor R68 and the 6th pin of the transceiver; the other end of the resistor R68 is connected to one end of the resistor R69 and the 7th pin of the transceiver; the other end of the resistor R69 is connected to a low level with the other end of the capacitor C47 and the 5th pin of the transceiver; the three diodes are respectively connected in parallel between the 5th and 6th pins, the 6th and 7th pins, and the 5th and 7th pins of the transceiver.

[0006] In the above circuit, the first PWM driving unit includes: a first PWM driving module and a second PWM driving module, wherein the second PWM driving module has the same structure as the first PWM driving module; the first PWM driving module includes: five resistors, three triodes, a field effect transistor, and a switch diode; the source of the field effect transistor Q12 is connected to a 12V input power supply with one end of the resistor R78 and the resistor R79; the gate of the field effect transistor Q12 is connected to a resistor R80, one end of the fourth resistor R81, and one end of the switch diode D39 ; The other end of the resistor R80 and the other end of the switching diode D39 are connected to the emitter of the transistor Q13 and the emitter of the transistor Q14; the other end of the resistor R78 is connected to the base of the transistor Q13, and the other end of the resistor R79 is connected to the collector of the transistor Q13; the other end of the resistor R78 is also connected to the base of the transistor Q14 and the collector of the transistor Q15; the collector of the transistor Q14 and the emitter of the transistor Q15 are grounded; the base of the transistor Q15 is connected to the fifth resistor R82.

[0007] In the above circuit, the first PWM driving unit further includes: a resistor, a capacitor and a TVC diode; after the resistor R83 is connected in parallel with the capacitor C98 and the TVC diode D70, both ends are connected to the first PWM driving module and the second PWM driving module respectively.

[0008] In the above circuit, the signal receiving unit includes: two capacitors, a diode, a photocoupler and two resistors; the first pin of the photocoupler M1 is connected to the cathode of the diode D6, one end of the capacitor C13 and one end of the resistor R20; the second pin of the photocoupler M1 is connected to the anode of the diode D6 and the other end of the capacitor C13; the third pin of the photocoupler M1 is connected to one end of the capacitor C16 and a low level; the fourth pin of the photocoupler M1 is connected to the other end of the capacitor C16 and one end of the resistor R21; the other end of the resistor R21 is connected to a high level.

[0009] In the above circuit, the second PWM driving unit includes: a third PWM driving module and a fourth PWM driving module, and the fourth PWM driving module has the same structure as the third PWM driving module; the third PWM driving module includes: a capacitor, four resistors, three diodes, a transistor and a field effect transistor; the drain of the field effect transistor Q1 is connected to the anode of the diode, and the anode of the diode is connected to a high level; the source of the field effect transistor Q1 is connected to one end of the capacitor C6, the anode of the diode D5 and the base of the transistor Q3; the gate of the field effect transistor Q1 is connected to the other end of the capacitor C6, one end of the resistor R9 and the collector of the transistor Q3; the emitter of the transistor Q3 is connected to one end of the resistor R17; the cathode of the diode D5 is connected to one end of the resistor R18 and the fourth resistor R27 respectively, and the other ends of the resistor R17, the resistor R18 and the fourth resistor R27 are connected to a low level.

[0010] In the above circuit, the circuit also includes: an LCD screen, a button and a buzzer; the LCD screen, the button and the buzzer are respectively connected to the MCU controller.

[0011] The technical solution adopted by the present invention to solve its technical problem is: an intelligent dimming control method, the improvement of which lies in that the method comprises: resetting the default addresses of a number of light sensors to 0, and assigning addresses in sequence according to the order of addition; polling the addresses of the light sensors to read light data, and storing the data read by each light sensor in a separate one-dimensional array; calculating the average value according to the several one-dimensional arrays as the effective value of the light environment; comparing the effective value of the light environment with the light demand setting value, sending an adjustment instruction to the LED light array, and completing the intelligent dimming.

[0012] In the above method, the method of obtaining an average value based on the several one-dimensional arrays as the effective value of the illumination environment includes: taking out the maximum value and the minimum value in the one-dimensional array in turn, and obtaining N average values ​​based on other numbers that are not equal to the maximum value and the minimum value; if N=1, the average value is the effective value of the illumination environment; if N=2, the two values ​​are averaged as the effective value of the illumination environment; if N=3, the value with the largest deviation is removed, and the average is obtained based on the other two values ​​as the effective value of the illumination environment; if N is greater than 3, the maximum value and the minimum value among the N values ​​are removed, and the average is obtained based on the remaining values ​​as the effective value of the illumination environment.

[0013] In the above method, the method further includes: if there is only one value in the one-dimensional array, taking the value as the average value; if there are only two values ​​in the one-dimensional array, taking the value with the largest number as the average value.

[0014] The beneficial effects of the present invention are: according to the illumination data read by a plurality of illumination sensors, the effective value of the illumination environment is obtained, and compared with the illumination requirement setting value, a dimming signal is output, and the PWM pulse width is changed to adjust the brightness of the LED lamp. It has strong anti-interference ability and can adapt to the changes in seasons and weather to accurately control the illumination requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A block diagram of one embodiment of an intelligent dimming control circuit;

[0016] Figure 2 It is a circuit diagram of an RS485 communication unit in an intelligent dimming control circuit;

[0017] Figure 3 It is a circuit schematic diagram of a first PWM driving unit in an intelligent dimming control circuit;

[0018] Figure 4 A circuit diagram of a signal receiving unit in an intelligent dimming control circuit;

[0019] Figure 5 It is a circuit schematic diagram of a second PWM driving unit in an intelligent dimming control circuit;

[0020] Figure 6 is a block diagram of another embodiment of an intelligent dimming control circuit;

[0021] Figure 7 The present invention is a flow chart of an intelligent dimming control method. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the invention can be combined interchangeably without conflicting with each other.

[0024] The present invention provides an intelligent dimming control circuit, comprising a power supply circuit 10, an MCU controller 20, a control circuit 30, and an LED light array 40; wherein the control circuit 30 comprises an RS485 communication unit 320 and a first PWM drive unit 310; and the LED light array 40 comprises a signal receiving unit 410, a second PWM drive unit 420, and a plurality of LED lamps. The power supply circuit 10 is connected to the MCU controller 20, the control circuit 30, and the LED light array 40, and is used to convert alternating current into direct current to supply power to the MCU controller 20, the control circuit 30, and the LED light array 40.

[0025] It is worth mentioning that the power supply circuit 10 converts the AC power between 100-230V into one 12V DC power, one 5V DC power and one 3.3V DC power, wherein the 12V DC power is used to drive the second PWM drive unit to control all LED lights and provide an external power supply for the light intensity sensor connected to the RS485 communication unit, and the 3.3V power is used to power the MCU controller. All lights are driven by the second PWM drive unit and connected in parallel, and all light intensity sensors are controlled by RS485 and connected to the RS485 bus.

[0026] The RS485 communication unit 320 is connected to the communication port of the MCU controller 20, and is used to convert the RS485 signal into a TTL signal of the MCU controller. The first PWM driving unit 310 is connected to the PWM port of the MCU controller 20, and is used to provide a dimming signal. The signal receiving unit 410 is connected to the first PWM driving unit 310, and is used to generate a control signal according to the dimming signal. The second PWM driving unit 420 is connected to the signal receiving unit 410, and realizes brightness adjustment of the LED lamp in response to the control signal.

[0027] Reference Figure 2As shown, in an exemplary embodiment, the RS485 communication unit 320 includes: two dual-input Schmitt triggers, a transceiver, three capacitors, three resistors and three diodes.

[0028] Among them, the two dual-input Schmitt triggers are respectively connected to the transceiver, and the 8th pin of the transceiver is respectively connected to a high level, a resistor R65 and one end of a capacitor C47; the other end of the resistor R65 is connected to one end of a resistor R68 and the 6th pin of the transceiver; the other end of the resistor R68 is connected to one end of the resistor R69 and the 7th pin of the transceiver; the other end of the resistor R69, the other end of the capacitor C47 and the 5th pin of the transceiver are connected to a low level; the three diodes are respectively connected in parallel between the 5th and 6th pins, the 6th and 7th pins, and the 5th and 7th pins of the transceiver.

[0029] Reference Figure 3 As shown, in an exemplary embodiment, the first PWM driving unit 310 includes: a first PWM driving module and a second PWM driving module, and the second PWM driving module has the same structure as the first PWM driving module; in the following embodiments, only the first PWM driving module is taken as an example.

[0030] The first PWM driving module includes: five resistors, three transistors, a field effect transistor, and a switch diode. The source of the field effect transistor Q12 is connected to a 12V input power supply with one end of the resistor R78 and the resistor R79; the gate of the field effect transistor Q12 is connected to the resistor R80, one end of the fourth resistor R81, and one end of the switch diode D39; the other end of the resistor R80 and the other end of the switch diode D39 are connected to the emitter of the transistor Q13 and the emitter of the transistor Q14; the other end of the resistor R78 is connected to the base of the transistor Q13, and the other end of the resistor R79 is connected to the collector of the transistor Q13; the other end of the resistor R78 is also connected to the base of the transistor Q14 and the collector of the transistor Q15; the collector of the transistor Q14 and the emitter of the transistor Q15 are grounded; the base of the transistor Q15 is connected to the fifth resistor R82.

[0031] Continue to refer to Figure 3 As shown, the first PWM driving unit 310 further includes: a resistor, a capacitor and a TVC diode. The resistor R83 is connected in parallel with the capacitor C98 and the TVC diode D70, and both ends are connected to the first PWM driving module and the second PWM driving module respectively.

[0032] Reference Figure 4As shown, in an exemplary embodiment, the signal receiving unit 410 includes: two capacitors, a diode, a photocoupler and two resistors.

[0033] The first pin of the photocoupler M1 is connected to the cathode of the diode D6, one end of the capacitor C13 and one end of the resistor R20; the other end of the resistor R20 is connected to S(DC)+; wherein the S(DC)+ is connected to Figure 3 The PWM_DIMMING output signal of the first PWM driving unit is used to generate a control signal according to the dimming signal of the first PWM driving signal.

[0034] The second pin of the photocoupler M1 is connected to the anode of the diode D6 and the other end of the capacitor C13; the third pin of the photocoupler M1 is connected to one end of the capacitor C16 and a low level; the fourth pin of the photocoupler M1 is connected to the other end of the capacitor C16 and one end of the resistor R21; the other end of the resistor R21 is connected to a high level.

[0035] Reference Figure 5 As shown, in an exemplary embodiment, the second PWM driving unit 420 includes: a third PWM driving module and a fourth PWM driving module. The fourth PWM driving module has the same structure as the third PWM driving module. The following embodiments only take the third PWM driving module as an example.

[0036] Wherein, the third PWM driving module includes: a capacitor, four resistors, two diodes, a transistor and a field effect transistor; the drain of the field effect transistor Q1 is connected to the anode of the diode D8, and the cathode of the diode D8 is connected to a high level; the source of the field effect transistor Q1 is connected to one end of the capacitor C6, the anode of the diode D5 and the base of the transistor Q3; the gate of the field effect transistor Q1 is connected to the other end of the capacitor C6, one end of the resistor R9 and the collector of the transistor Q3; the emitter of the transistor Q3 is connected to one end of the resistor R17; the cathode of the diode D5 is respectively connected to one end of the resistor R18 and the fourth resistor R27, and the other ends of the resistor R17, the resistor R18 and the fourth resistor R27 are connected to a low level.

[0037] Figure 5 In the embodiment, the PWM1 signal port and the PWM2 signal port are respectively connected to LED lamps of different colors, and each PWM signal port can be connected in parallel to multiple LED lamps of the same model, so as to adjust the brightness of the LED lamp.

[0038] In one possible implementation, Figure 6As shown, the intelligent dimming control circuit provided in the present application also includes: an LCD screen, a button and a buzzer; the LCD screen, the button and the buzzer are respectively connected to the MCU controller 20.

[0039] In one possible implementation, Figure 7 As shown, the present application also provides an intelligent dimming control method, the method comprising:

[0040] S1. Reset the default addresses of several light sensors to 0, and assign addresses in the order in which they were added.

[0041] The default address of all light sensors is 0. If it is not 0, it needs to be set to 0. Make sure to connect only one light sensor at a time and reassign the address to 1 (all addresses cannot be repeated).

[0042] After the addresses are allocated, light sensors are added one by one, and the number can be increased to no more than 254 (the address of the light sensor is 1 byte). Here we assume that the number added is N.

[0043] S2. Poll the address of the light sensor to read the light data, and store the data read by each light sensor in a separate one-dimensional array.

[0044] Specifically, after adding the light sensor, start polling to read the light data through the RS485 communication unit and save it in RAM. The reading speed can be set as the sensitivity of reading the light sensor. The larger the value is set, the faster the reading speed will be. It is recommended to read the value of a sensor in 200ms. Reading too fast will cause the light sensor to fail to respond.

[0045] The data read by each light sensor is stored in a one-dimensional array. Each array is defined as 10 elements. When all the light sensors have read 10 data, data processing begins.

[0046] S3. Calculate an average value according to the plurality of one-dimensional arrays as an effective value of the illumination environment.

[0047] In one possible implementation, the maximum value and the minimum value in the one-dimensional array are taken out in turn, and N average values ​​are obtained based on other numbers that are not equal to the maximum value and the minimum value; if N=1, the average value is the effective value of the illumination environment; if N=2, the two values ​​are averaged as the effective value of the illumination environment; if N=3, the value with the largest deviation is removed, and the average is calculated based on the other two values ​​as the effective value of the illumination environment; if N is greater than 3, the maximum value and the minimum value among the N values ​​are removed, and the average is calculated based on the remaining values ​​as the effective value of the illumination environment.

[0048] It is worth mentioning that if there is only one value in the one-dimensional array, the value is taken as the average value; if there are only two values ​​in the one-dimensional array, the value with the largest number is taken as the average value.

[0049] S4. Compare the effective value of the illumination environment with the set value of the illumination requirement, send an adjustment instruction to the LED light array, and complete intelligent dimming.

[0050] If the effective value of the illumination environment is less than the required data, a command is sent to increase the brightness of the LED lamp. If the effective value of the illumination environment is greater than the required data, a command is sent to decrease the brightness of the LED lamp. The adjustment speed here is adjusted at a ratio of 1% or less of the difference between the two data. When the brightness of the LED lamp changes, the data read by the illumination sensor also changes accordingly. By looping the above steps in sequence, intelligent dimming can be achieved.

[0051] Through the above embodiments, the present application provides an intelligent dimming control circuit and method, which obtains the effective value of the illuminance environment according to the illumination data read by a plurality of illuminance sensors, compares it with the illumination requirement setting value, outputs a dimming signal, and changes the PWM pulse width to adjust the brightness of the LED lamp. It has strong anti-interference ability and can accurately control the illumination requirements to adapt to the changes in seasons and weather. It solves the problem in the prior art that LED lamps cannot intelligently adapt to the inconsistent length of day and night caused by seasonal changes, for example, and the inconsistent illumination requirements caused by weather changes in a short period of time.

[0052] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An intelligent dimming control circuit, characterized in that: include: Power supply circuit, MCU controller, control circuit, LED light array; the control circuit includes RS485 communication unit and first PWM drive unit; The LED light emitting array comprises a signal receiving unit, a second PWM driving unit and a plurality of LED lamps; The power supply circuit is connected to the MCU controller, the control circuit and the LED light array, and is used to convert AC power into DC power to supply power to the MCU controller, the control circuit and the LED light array; The RS485 communication unit is connected to the communication port of the MCU controller and is used to convert the RS485 signal into a TTL signal of the MCU controller; the input of the RS485 communication unit is the light data of the light sensor; The first PWM driving unit is connected to the PWM port of the MCU controller and is used to provide a dimming signal; The signal receiving unit is connected to the first PWM driving unit and is used to generate a control signal according to the dimming signal; The signal receiving unit includes: two capacitors C13 and C16, a diode D6, a photocoupler M1 and two resistors R20 and R21; the first pin of the photocoupler M1 is connected to the cathode of the diode D6, one end of the capacitor C13 and one end of the resistor R20; the second pin of the photocoupler M1 is connected to the anode of the diode D6 and the other end of the capacitor C13; the third pin of the photocoupler M1 is connected to one end of the capacitor C16 and a low level; the fourth pin of the photocoupler M1 is connected to the other end of the capacitor C16 and one end of the resistor R21; the other end of the resistor R21 is connected to a high level; The second PWM driving unit is connected to the signal receiving unit, and is used to adjust the brightness of the LED lamp in response to the control signal; The first PWM driving unit includes: a first PWM driving module and a second PWM driving module, wherein the second PWM driving module has the same structure as the first PWM driving module; the first PWM driving module includes: five resistors R78-R82, three transistors Q13-Q15, a field effect transistor Q12, and a switching diode D39; The source of the field effect transistor Q12 is connected to a 12V input power supply with one end of the resistor R78 and the resistor R79; the gate of the field effect transistor Q12 is connected to one end of the resistor R80 and the resistor R81 and the anode of the switch diode D39; the other end of the resistor R80 and the cathode of the switch diode D39 are connected to the emitter of the transistor Q13 and the emitter of the transistor Q14; the other end of the resistor R78 is connected to the base of the transistor Q13, and the other end of the resistor R79 is connected to the collector of the transistor Q13; the other end of the resistor R78 is also connected to the base of the transistor Q14 and the collector of the transistor Q15; the collector of the transistor Q14 and the emitter of the transistor Q15 are grounded; the base of the transistor Q15 is connected to the resistor R82; The second PWM driving unit includes: a third PWM driving module and a fourth PWM driving module, wherein the fourth PWM driving module has the same structure as the third PWM driving module; the third PWM driving module includes: a capacitor C6, four resistors R9, R17, R18 and R27, two diodes D5 and D8, a transistor Q3 and a field effect transistor Q1; The drain of the field effect transistor Q1 is connected to the anode of the diode D8, and the cathode of the diode D8 is connected to a high level; the source of the field effect transistor Q1 is connected to one end of the capacitor C6, the anode of the diode D5 and the base of the transistor Q3; the gate of the field effect transistor Q1 is connected to the other end of the capacitor C6, one end of the resistor R9 and the collector of the transistor Q3; the emitter of the transistor Q3 is connected to one end of the resistor R17; the cathode of the diode D5 is connected to one end of the resistor R18 and the resistor R27 respectively, and the other ends of the resistors R17, R18 and R27 are connected to a low level; The second PWM driving unit has a plurality of PWM signal ports, each of the plurality of PWM signal ports is respectively connected to an LED lamp of a different color; The power supply circuit can convert 100-230V AC power into one 12V DC power, one 5V DC power and one 3.3V DC power. The 12V DC power is used to power the second PWM drive unit, and the 3.3V DC power is used to power the MCU controller.

2. The intelligent dimming control circuit according to claim 1, characterized in that: The RS485 communication unit includes: two dual-input Schmitt triggers, a transceiver, three capacitors, three resistors and three diodes; The two dual-input Schmitt triggers are respectively connected to the transceiver, and the 8th pin of the transceiver is respectively connected to a high level, a resistor R65 and one end of a capacitor C47; the other end of the resistor R65 is connected to one end of a resistor R68 and the 6th pin of the transceiver; the other end of the resistor R68 is connected to one end of a resistor R69 and the 7th pin of the transceiver; the other end of the resistor R69, the other end of the capacitor C47 and the 5th pin of the transceiver are connected to a low level; the three diodes are respectively connected in parallel between the 5th and 6th pins, the 6th and 7th pins, and the 5th and 7th pins of the transceiver; the transceiver model is SP485REN.

3. The intelligent dimming control circuit according to claim 1, characterized in that: The first PWM driving unit further includes: a resistor, a capacitor and a TVC diode; After the resistor is connected in parallel with the capacitor and the TVC diode, two ends of the resistor are connected to the first PWM driving module and the second PWM driving module respectively.

4. The intelligent dimming control circuit according to claim 1, characterized in that: The circuit also includes: an LCD screen, a button and a buzzer; the LCD screen, the button and the buzzer are respectively connected to the MCU controller.

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