Digital control circuit of LED light source

Abstract

The utility model discloses a digital control circuit of an LED light source. The digital control circuit comprises a box body, a CPU, keys, a transmission end I, a transmission end II, an energy supply interface, an auxiliary cooling device, a display circuit and a display screen, the auxiliary cooling device is arranged, air flow is introduced from the air inlet pipe by starting the sucking pump, dust flowing into the air inlet pipe can be filtered through the dust remover, the air flow flows into the air storage box, and air flows into equipment arranged in the box body through the air inlet pipe to cool the equipment. Therefore, an auxiliary cooling effect on equipment arranged in the box body is achieved by arranging the auxiliary cooling device, the stability of the internal temperature of the equipment is ensured, and the problem that the equipment is cooled by adopting single heat dissipation holes in the original equipment, but the heat dissipation efficiency of the heat dissipation holes has an upper limit as time goes on is solved. And it cannot be ensured that a heat dissipation structure can meet the heat dissipation requirement of a machine in light source control.

Description

Technical Field

[0001] The utility model relates to the technical field of LED lighting, in particular to a digital control method and device for an LED light source, which are used to achieve precise brightness adjustment and color management of the LED light source. Background Technique

[0002] A circuit that uses digital signals to perform arithmetic and logical operations on digital quantities is called a digital circuit or a digital system. Since it has logical operation and logical processing functions, it is also called a digital logic circuit. Modern digital circuits are constructed by several digital integrated devices made by semiconductor technology. Logic gates are the basic units of digital logic circuits, and memories are digital circuits used to store binary data. Overall, digital circuits can be divided into two categories: combinational logic circuits and sequential logic circuits.

[0003] Most of the existing LED light source control technologies adopt analog control methods. This method has a slow response speed. After the staff adjusts the brightness during operation, the device may generate a large amount of heat that needs to be discharged from the device. However, the original device uses a single-set heat dissipation hole to dissipate heat from the device. As time goes by, the heat dissipation efficiency of the heat dissipation hole has an upper limit, and it cannot be guaranteed that the heat dissipation structure can meet the heat dissipation needs of the machine for light source control. Content of the Utility Model

[0004] Therefore, in order to solve the above deficiencies, the utility model provides a digital control circuit for an LED light source.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions: A digital control circuit for an LED light source includes a box body, a CPU and keys, a first transmission end, a second transmission end, a power supply interface, an auxiliary cooling device, a display circuit and a display screen. The CPU and keys are installed inside the box body. The first transmission end is installed on the top of the box body. The second transmission end is arranged on the right end of the first transmission end. The power supply interface is arranged at the rear end of the second transmission end. The auxiliary cooling device is arranged at the rear end of the first transmission end. The display circuit and the display screen are fixed to the left end of the box body. The auxiliary cooling device includes an air storage tank, an intake pipe, an exhaust pipe, an air extraction pump, a dust filter, a current limiting plate, an exhaust hood, and an intake hood. The intake pipe is installed at the right end of the top of the air storage tank. The exhaust pipe is arranged at the left end of the intake pipe. The air extraction pump is fixed to the top of the air storage tank. The dust filter is installed on the tops of the intake pipe and the exhaust pipe. The current limiting plate is arranged inside the air storage tank. The exhaust hood is arranged at the left end inside the air storage tank. The exhaust hood is installed below the exhaust pipe. The intake hood is arranged at the right end inside the air storage tank. The intake hood is installed below the exhaust pipe.

[0006] As a further solution of the present utility model, the dust protector includes an installation cylinder, an adjustment push rod, an installation cover, a dust-proof filter frame, and an anti-collision pad. There are two groups of the installation cylinders, which are respectively installed on the tops of the air inlet pipe and the air outlet pipe. An adjustment push rod is installed inside the installation cylinder, and the adjustment push rod is drivingly connected to the rear end of the installation cover. The dust-proof filter frame is installed at the bottom of the installation cover, and the anti-collision pad is arranged at the bottom of the dust-proof filter frame, and the anti-collision pad is movably connected to the inner low end of the air inlet pipe or the air outlet pipe.

[0007] As a further solution of the present utility model, the CPU and the keys are composed of a peripheral key and a CPU control processor, which facilitates the staff to control the CPU control processor through the peripheral key, thereby reducing the supervision cost.

[0008] As a further solution of the present utility model, the CPU control processor includes a control program, a working mode control circuit, a driving and power transistor circuit, a current, temperature, and illuminance detection circuit. Among them, the CPU control processor guides the normal operation of each circuit through the control program in cooperation with the working mode control circuit.

[0009] As a further solution of the present utility model, the first transmission end and the second transmission end respectively adopt RS model and RS232 model communication interfaces. Among them, the first transmission end adopts an RS485 model communication interface for long-distance communication, and the second transmission end adopts an RS model communication interface for short-distance communication.

[0010] As a further solution of the present utility model, by setting the first transmission end and the second transmission end, and controlling each port separately, the service life of the light source is greatly extended, and at the same time, the mutual influence caused by the simultaneous lighting of the light sources in all directions is avoided.

[0011] As a further solution of the present utility model, the air inlet pipe and the air outlet pipe are symmetrically arranged on the top of the air storage tank.

[0012] As a further solution of the present utility model, the exhaust hood and the intake hood are arranged at the same level inside the air storage tank.

[0013] As a further solution of the present utility model, the adjustment push rod and the installation cover are vertically arranged inside the installation cylinder.

[0014] As a further solution of the present utility model, a buffer spring is installed inside the installation cover.

[0015] Compared with the prior art, the present utility model provides a digital control circuit for an LED light source, which has the following beneficial effects:

[0016] 1. In the present utility model, an auxiliary cooling device is provided. By starting the air extraction pump, air flow is introduced from the intake pipe. The dust collector can filter the dust flowing into the intake pipe, enabling the air flow to enter the inside of the air storage tank. Then, through the intake pipe, the gas flows in to cool the equipment arranged inside the box body. During this process, the current limiting plate can introduce part of the air flow into the left end of the air storage tank, prompting part of the air flow to be discharged from the exhaust hood. Through part of the air flow, the hot air is guided to flow out from the outlet pipe. Thus, by setting the auxiliary cooling device, it plays an auxiliary cooling role for the equipment arranged inside the box body, ensuring the stability of the internal temperature of the equipment, and further solving the problem that in the original equipment, a single heat dissipation hole is used for heat dissipation of the equipment. However, over time, the heat dissipation efficiency of the heat dissipation hole has an upper limit, and it cannot be guaranteed that the heat dissipation structure can meet the heat dissipation requirements in the light source control of the machine.

[0017] 2. In the present utility model, a dust collector is provided at the upper end of the auxiliary cooling device. By starting the adjusting push rod to push the mounting cover up and down, the mounting cover can drive the dust-proof filter frame to move. The dust-proof filter frame collides with the intake pipe and the outlet pipe through the anti-collision pads. The dust-proof filter frame can shake under the assistance of the telescopic spring arranged inside the mounting cover, enabling the dust-proof filter frame to shake off the dust, and thus achieving the effect of shaking off the dust floating in from the intake pipe through the dust collector to prevent the dust from floating into the equipment interior and causing blockage inside the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the three-dimensional structural schematic diagram of the present utility model;

[0019] Figure 2 is the side structural schematic diagram of the present utility model;

[0020] Figure 3 is the three-dimensional structural schematic diagram of the auxiliary cooling device of the present utility model;

[0021] Figure 4 is the internal structural schematic diagram of the auxiliary cooling device of the present utility model;

[0022] Figure 5 is the structural schematic diagram of the dust collector of the present utility model;

[0023] Figure 6 is the control relationship schematic diagram of the present utility model;

[0024] Figure 7 is the schematic diagram of the drive and power transistor circuit of the present utility model;

[0025] Figure 8 is the schematic diagram of the current detection circuit of the present utility model;

[0026] Figure 9 is the schematic diagram of the temperature detection circuit of the present utility model;

[0027] Figure 10 It is a schematic diagram of the working mode control circuit in the present utility model;

[0028] Figure 11 It is a schematic diagram of the communication circuit in the present utility model;

[0029] Figure 12 It is a schematic diagram of the CPU in the present utility model;

[0030] Figure 13 It is a schematic diagram of the key and display circuit in the present utility model.

[0031] Among them: box body - 1, CPU and key - 2, transmission end one - 3, transmission end two - 4, power supply interface - 5, auxiliary cooling device - 6, display circuit and display screen - 7, gas storage tank - 61, intake pipe - 62, exhaust pipe - 63, air extraction pump - 64, dust protector - 65, current limiting plate - 66, exhaust hood - 67, intake hood - 68, installation cylinder - 651, adjusting push rod - 652, installation cover - 653, dustproof filter frame - 654, anti - collision pad - 655. Specific embodiments

[0032] In order to further explain the technical solution of the present utility model, the following will be elaborated in detail through specific embodiments.

[0033] Please refer to Figure 1 and Figure 2 , in the embodiment of the present utility model:

[0034] A digital control circuit for an LED light source, comprising a box body 1, a CPU and keys 2, a first transmission end 3, a second transmission end 4, an energy supply interface 5, an auxiliary cooling device 6, a display circuit and a display screen 7. The CPU and keys 2 are installed inside the box body 1. The first transmission end 3 is installed on the top of the box body 1. The second transmission end 4 is arranged at the right end of the first transmission end 3. The energy supply interface 5 is arranged at the rear end of the second transmission end 4. The auxiliary cooling device 6 is arranged at the rear end of the first transmission end 3. The display circuit and the display screen 7 are fixed to the left end of the box body 1. The CPU and keys 2 are composed of a peripheral key and a CPU control processor, which facilitates the staff to control the CPU control processor through the peripheral key, thereby reducing the supervision cost. The CPU control processor includes a control program, a working mode control circuit, a driving and power transistor circuit, a current, temperature and illuminance detection circuit. Among them, the CPU control processor guides the normal operation of each circuit through the control program in cooperation with the working mode control circuit. The first transmission end 3 and the second transmission end 4 respectively adopt RS232 type and RS485 type communication interfaces. Among them, the first transmission end 3 adopts the RS485 type communication interface for long-distance communication, and the second transmission end 4 adopts the RS232 type communication interface for short-distance communication. By setting the first transmission end 3 and the second transmission end 4, each port is controlled separately, thereby greatly extending the light source life and avoiding the mutual influence caused by the simultaneous lighting of the light sources in all directions.

[0035] Please refer to 3 and Figure 4 , in the embodiment of the present invention:

[0036] The auxiliary cooling device 6 includes an air storage tank 61, an intake pipe 62, an exhaust pipe 63, an air extraction pump 64, a dust guard 65, a current limiting plate 66, an exhaust hood 67, and an intake hood 68. The intake pipe 62 is installed at the right end of the top of the air storage tank 61. The exhaust pipe 63 is arranged at the left end of the intake pipe 62. The air extraction pump 64 is fixed to the top of the air storage tank 61. The dust guard 65 is installed on the tops of the intake pipe 62 and the exhaust pipe 63. The current limiting plate 66 is arranged inside the air storage tank 61. The exhaust hood 67 is arranged at the left end inside the air storage tank 61. The exhaust hood 67 is installed below the exhaust pipe 63. The intake hood 68 is arranged at the right end inside the air storage tank 61. The intake hood 68 is installed below the exhaust pipe 63. The intake pipe 62 and the exhaust pipe 63 are symmetrically arranged at the top of the air storage tank 61. The exhaust hood 67 and the intake hood 68 are arranged at the same level inside the air storage tank 61.

[0037] Please refer to 5, in the embodiment of the present invention:

[0038] The dust protector 65 includes an installation cylinder 651, an adjustment push rod 652, an installation cover 653, a dust-proof filter frame 654, and an anti-collision pad 655. There are two groups of installation cylinders 651, and the two groups of installation cylinders 651 are respectively installed on the tops of the intake pipe 62 and the exhaust pipe 63. An adjustment push rod 652 is installed inside the installation cylinder 651. The adjustment push rod 652 is drivingly connected to the rear end of the installation cover 653. A dust-proof filter frame 654 is installed at the bottom of the installation cover 653. An anti-collision pad 655 is arranged at the bottom of the dust-proof filter frame 654. The anti-collision pad 655 is movably connected to the inner lower end of the intake pipe 62 or the exhaust pipe 63. The adjustment push rod 652 and the installation cover 653 are vertically arranged inside the installation cylinder 651, and a buffer spring is installed inside the installation cover 653.

[0039] Reference Figures 1 - 5 , during use, place the horizontal box body 1 above the ground so that the device is supported. Then connect the power supply wire to the power supply interface 5 so that the power supply interface 5 can supply power to the devices inside the box body 1, ensuring that the devices inside the box body can operate normally, and connect the transmission wires to the transmission end one 3 and the transmission end two 4 respectively;

[0040] Manually click the button to start the CPU. The CPU cooperates with the working mode control circuit through the control program to control the light source data to be transmitted from the transmission wires connected to the upper ends of the transmission end one 3 and the transmission end two 4 to above the LED irradiation device, so that the LED can emit a fast, stable and direct light source. During this process, the drive and power transistor circuit, current, temperature and illuminance detection circuit in the CPU can ensure the stability of the device. Then the display circuit receives the data generated by the CPU, enabling the display screen to display and feedback the changes in the data generated by the CPU, and further displaying the changes in the CPU during operation through the display circuit and the display screen 7;

[0041] Next, start the air pump 64 to introduce the air flow from the intake pipe 62. The dust protector 65 can filter the dust flowing into the intake pipe 62, enabling the air flow to flow into the inside of the air storage tank 61. Then, the gas flows through the intake pipe 62 to cool the devices arranged inside the box body 1. During this process, the current-limiting plate 66 can introduce part of the air flow into the left end of the air storage tank 61, prompting part of the air flow to be discharged from the exhaust hood 67, and guiding part of the hot air to flow out from the exhaust pipe 63 through part of the air flow, thereby achieving the role of auxiliary cooling of the devices arranged inside the box body 1 by setting the auxiliary cooling device 6, ensuring the stability of the internal temperature of the device, and thus solving the problem that in the original device, a single heat dissipation hole is used to dissipate heat from the device. However, over time, the heat dissipation efficiency of the heat dissipation hole has an upper limit, and it cannot be guaranteed that the heat dissipation structure can meet the heat dissipation requirements in the light source control of the machine;

[0042] Meanwhile, by starting to adjust the push rod 652 to push the mounting cover 653 up and down, the mounting cover 653 can drive the dust-proof filter frame 654 to move, so that the dust-proof filter frame 654 collides with the intake pipe 62 and the exhaust pipe 63 through the anti-collision pad 655. The dust-proof filter frame 654 can shake the dust-proof filter frame 654 with the assistance of the telescopic spring arranged inside the mounting cover 653, so that the dust-proof filter frame 654 can shake off the dust, and then shake off the dust floating in from the intake pipe 62 through the dust-proof device 65, preventing the dust from floating into the equipment interior and causing blockage inside the equipment.

[0043] The operation process of the circuit flow in this utility model:

[0044] After the control device is powered on, the CPU first reads the previously set brightness data from the memory, and after conversion, it is sent to the internal PWM circuit. The PWM circuit outputs a PWM signal corresponding to the brightness data.

[0045] If at this time Figure 10 the 2-3 pins of KEY1 in the working mode control circuit are connected, the signal PS2 at the 2nd pin of KEY1 will be at a low level. This signal is connected to Figure 1 R36 of, making Q11 cut off. The PWM signal is not affected by Q11 and enters Figure 7 the drive circuit composed of R24, R28, Q7, and Q9 in. Q7 and Q9 shape and amplify the PWM signal, making the edge of the PWM signal waveform steeper and the drive current larger, and then go to drive the power transistor VT1.

[0046] If at this time Figure 10 the 2-3 pins of KEY1 in the working mode control circuit are connected, the signal PS2 at the 2nd pin of KEY1 will be at a low level. This signal is connected to Figure 1 R36 of, making Q11 cut off. The PWM signal is not affected by Q11 and enters Figure 7 the drive circuit composed of R24, R28, Q7, and Q9 in. Q7 and Q9 shape and amplify the PWM signal, making the edge of the PWM signal waveform steeper and the drive current larger, and then go to drive the power transistor VT1.

[0047] If Figure 10 the 2-1 pins of KEY1 in the working mode control circuit are connected, when there is no trigger signal from the camera, the signal PS2 at the 2nd pin of KEY1 will be at a high level, resulting in Figure 1 Q11 in conducting, the PWM signal is connected to GND by Q11, Q7 and Q9 have no input signal, and the power transistor VT1 does not work, and the LED load goes out. When the camera sends a trigger signal, the signal PS2 at the 2nd pin of KEY1 will become a low level, and Q11 cuts off. The PWM signal is not affected by Q11, and the subsequent circuit works normally.

[0048] After the power transistor VT1 is turned on, the positive pole of the 24V power supply passes through the load → the third pin of VT1 → the second pin of VT1 → R34, and returns to the negative pole of the power supply. By changing the duty cycle of the PWM signal, the time for the power supply to supply power to the load per unit time can be changed, so as to achieve the purpose of adjusting the luminous brightness of the LED load.

[0049] After the LED load is powered on and emits light, Figure 7 In the R34 and C10 filter circuit, the output voltage Vf1 is sent to Figure 8 the second pin of U1A in. This voltage is compared with the reference voltage at the third pin in U1A. The comparison result enters the CPU for processing.

[0050] At the same time, the temperature detection and illuminance detection circuits also work normally, and their output signals are also sent to the CPU respectively. When the CPU detects that the current rises abnormally or the temperature reaches 80 degrees, it will interrupt the output of the PWM signal, the load stops working, and at the same time, alarm signals are output outward through RS232 and RS485.

[0051] During the working process, the CPU continuously scans each key in a loop to receive the user's input. Or when the user inputs data from the communication interface, the CPU also receives it in time. Then, based on the received data, after calculation, the CPU correspondingly changes the duty cycle of the PWM signal, so that the brightness of the LED load changes accordingly. At the same time, these data are saved for direct calling after the next power-on.

[0052] At the same time, during the working process, the CPU also continuously outputs the current data to the display circuit in a loop to display each data value to the user.

[0053] The control mode of the present utility model is controlled by manually starting and closing the switch. The wiring diagram of the power element and the power supply provision belong to the common knowledge in the art, and the present utility model is mainly used to protect mechanical devices, so the control mode and wiring layout of the present utility model will not be explained in detail.

[0054] The control mode of the present utility model is automatically controlled by a controller. The control circuit of the controller can be realized by simple programming by those skilled in the art, and the power supply provision also belongs to the common knowledge in the art. Since the present utility model is mainly used to protect mechanical devices, the control mode and circuit connection of the present utility model will not be explained in detail.

[0055] The above are only the preferred examples of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A digital control circuit for an LED light source, comprising a housing (1), a CPU and a button (2), a transmission terminal 1 (3), a transmission terminal 2 (4), an energy supply interface (5), an auxiliary cooling device (6), a display circuit and a display screen (7), wherein the housing (1) is provided with the CPU and the button (2), the transmission terminal 1 (3) is installed on the top of the housing (1), the transmission terminal 2 (4) is arranged at the right end of the transmission terminal 1 (3), the energy supply interface (5) is arranged at the rear end of the transmission terminal 2 (4), the auxiliary cooling device (6) is arranged at the rear end of the transmission terminal 1 (3), and the display circuit and the display screen (7) are fixed to the left end of the housing (1); Features: The auxiliary cooling device (6) comprises an air storage box (61), an air inlet pipe (62), an air outlet pipe (63), an air pump (64), a dust collector (65), a flow limiting plate (66), an exhaust hood (67), and an air inlet hood (68). The air inlet pipe (62) is installed at the right end of the top of the air storage box (61), the air outlet pipe (63) is arranged at the left end of the air inlet pipe (62), and the air pump (64) is fixed to the top of the air storage box (61). The dust preventer (65) is installed at the top of the air inlet pipe (62) and the air outlet pipe (63), the flow limiting plate (66) is arranged inside the air storage box (61), the exhaust hood (67) is arranged at the left end inside the air storage box (61), the exhaust hood (67) is installed below the air outlet pipe (63), the air inlet hood (68) is arranged at the right end inside the air storage box (61), and the air inlet hood (68) is installed below the air outlet pipe (63).

2. The digital control circuit of an LED light source according to claim 1, characterized in that: The dust preventer (65) comprises a mounting tube (651), an adjusting push rod (652), a mounting cover (653), a dust filter frame (654), and an anti-collision pad (655). The mounting tube (651) is provided with two groups, and the two groups of mounting tubes (651) are respectively mounted on the top of the air inlet pipe (62) and the air outlet pipe (63). An adjusting push rod (652) is installed inside the mounting tube (651), and the adjusting push rod (652) is transmission-connected to the rear end of the mounting cover (653). A dust filter frame (654) is installed at the bottom of the mounting cover (653), and an anti-collision pad (655) is provided at the bottom of the dust filter frame (654). The anti-collision pad (655) is movably connected to the lower end inside the air inlet pipe (62) or the air outlet pipe (63).

3. The digital control circuit of an LED light source according to claim 1, characterized in that: The CPU and buttons (2) are composed of an external button and a CPU control processor, which makes it convenient for staff to control the CPU control processor through the external button, thereby reducing the cost of supervision.

4. The digital control circuit of the LED light source according to claim 3, characterized in that: The CPU control processor includes a control program, a working mode control circuit, a drive and power tube circuit, and a current, temperature and light intensity detection circuit, wherein the CPU control processor guides each circuit to operate normally through the control program in conjunction with the working mode control circuit.

5. The digital control circuit of an LED light source according to claim 1, characterized in that: The transmission terminal 1 (3) and the transmission terminal 2 (4) respectively use RS232 and RS485 communication interfaces, wherein the transmission terminal 1 (3) uses the RS485 communication interface for long-distance communication, and the transmission terminal 2 (4) uses the RS232 communication interface for short-distance communication.

6. The digital control circuit of an LED light source according to claim 1, characterized in that: By setting the transmission end 1 (3) and the transmission end 2 (4), each port is controlled individually, thereby greatly extending the life of the light source and avoiding the mutual influence caused by the simultaneous lighting of light sources in various directions.

7. The digital control circuit of an LED light source according to claim 1, characterized in that: The air inlet pipe (62) and the air outlet pipe (63) are symmetrically arranged on the top of the air storage box (61).

8. The digital control circuit of an LED light source according to claim 1, characterized in that: The exhaust hood (67) and the intake hood (68) are arranged inside the air storage box (61) at the same level.

9. The digital control circuit of an LED light source according to claim 2, characterized in that: The adjusting push rod (652) and the mounting cover (653) are vertically arranged inside the mounting tube (651).

10. The digital control circuit of an LED light source according to claim 2, characterized in that: A buffer spring is installed inside the mounting cover (653).

Images