A low-frequency flash dimming system with VCC auxiliary power supply

Abstract

The utility model provides a low frequency flash dimming system of self -help VCC auxiliary power supply, including signal detection circuit, input power interface and analog signal generator respectively with the input and output connection of signal detection circuit, with the output end connection of analog signal generator master control unit, and with the output end connection of master control unit LED lamp pearl module, the system still includes with the host computer main road output node or host computer transformer secondary VCC winding output end connection's VCC auxiliary power supply circuit, the output end connection analog signal generator and master control unit of VCC auxiliary power supply circuit. Through dispense with independent MCU power supply circuit and remove frequency flash circuit unit, reduce the component quantity, significantly reduce hardware cost and circuit complexity, improve system reliability, ensure dimming soft low frequency flash simultaneously, be applicable to ordinary lighting, landscape lighting and industrial lighting etc. Variety of scene, promote user experience.

Description

Technical Field

[0001] This utility model relates to the field of LED dimming technology, and in particular to a low-frequency flicker dimming system with built-in VCC auxiliary power supply. Background Technology

[0002] As the application of LED lighting gradually moves towards intelligentization, people are no longer limited to the most primitive "on" and "off" modes, but are gradually realizing the adjustment and control of light. This not only saves energy, but also creates atmosphere and meets the needs of multiple scenarios.

[0003] Based on different dimming methods, LED dimming technology can be divided into three categories: 1. External PWM dimming: External PWM dimming is achieved through an external PWM dimmer, which can be a manual or automatic dimmer. A manual dimmer is usually a knob, allowing users to change the brightness of the light fixture via a knob or button. Automatic dimmers typically adjust the brightness automatically using light sensors, motion sensors, or other sensors. 2. Built-in PWM dimming: Built-in PWM dimming integrates the PWM dimming circuitry into the LED light fixture. 3. Variable current dimming: Variable current dimming achieves dimming by changing the current of the light fixture. Variable current dimming can be implemented through a current controller or the PWM dimming circuitry of the LED driver.

[0004] In the existing technology, all of the above-mentioned dimming technologies require the use of a single-chip microcomputer (MCU) for control. The MCU needs to add a separate power supply line and a frequency reduction lightning circuit. The separate power supply line and the frequency reduction lightning circuit require an increase in the energy storage of electrolytic capacitors, resulting in a large product size and high cost. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a low-frequency flicker dimming system with built-in VCC auxiliary power supply, which aims to solve the technical problems of large size and high cost of existing products.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a low-frequency flicker dimming system with built-in VCC auxiliary power supply, characterized in that it includes a signal detection circuit, an input power interface and an analog signal generator connected to the input and output terminals of the signal detection circuit respectively, a main control unit connected to the output terminal of the analog signal generator, and an LED lamp bead module connected to the output terminal of the main control unit. The system also includes a VCC auxiliary power supply line connected to the output terminal of the main output node of the host or the secondary VCC winding of the host transformer, and the output terminal of the VCC auxiliary power supply line is connected to the analog signal generator and the main control unit.

[0007] According to one aspect of the above technical solution, the output terminal of the analog signal generator is connected to the DIM pin of the main control unit.

[0008] According to one aspect of the above technical solution, the signal detection circuit includes a first resistor, a second resistor, and a first capacitor. The first resistor and the second resistor are connected in series between the positive and negative terminals of the input power interface, and the first capacitor is connected in parallel across the two ends of the second resistor.

[0009] According to one aspect of the above technical solution, the main control unit includes a constant current main control IC composed of a first IC and a second IC, and the power supply pin of the constant current main control IC is connected to the output terminal of the VCC auxiliary power supply line.

[0010] According to one aspect of the above technical solution, the main control unit further includes a startup unit, which includes a first startup resistor and a second startup resistor connected in series between the input power interface and the constant current main control IC.

[0011] According to one aspect of the above technical solution, the main control unit further includes a reference sampling module, which includes a first current sampling resistor and a second current sampling resistor connected to the current detection pin of the constant current main control IC, and a first voltage sampling resistor and a second voltage sampling resistor connected to the voltage feedback pin of the constant current main control IC.

[0012] According to one aspect of the above technical solution, the main control unit further includes a constant power circuit, which includes a third resistor, a fourth resistor, and a fifth resistor connected to the power adjustment pin of the first IC, and a sixth resistor, a seventh resistor, and an eighth resistor connected to the power adjustment pin of the second IC.

[0013] According to one aspect of the above technical solution, the low-frequency flicker dimming system with built-in VCC auxiliary power supply further includes a filter circuit, which includes a filter capacitor disposed between the main control unit and the LED lamp bead module, and a discharge resistor connected in parallel across the filter capacitor.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: by eliminating the independent MCU power supply line and the frequency reduction and flicker circuit unit, the VCC auxiliary power supply is used to directly draw power from the main circuit of the host or the secondary winding of the transformer and combined with analog signal processing, which reduces the number of components, significantly reduces hardware costs and circuit complexity, improves system reliability, and ensures soft dimming and low flicker. It is suitable for various scenarios such as general lighting, landscape lighting and industrial lighting, and enhances the user experience. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the circuit structure of a low-frequency flicker dimming system with built-in VCC auxiliary power supply in one embodiment of the present invention. Figure 2 This is a structural block diagram of a low-frequency flicker dimming system with built-in VCC auxiliary power supply in one embodiment of the present invention; Explanation of key component symbols in the diagram: Input power interface 10, first IC 11, second IC 12, analog signal generator 13, first start-up resistor 14, second start-up resistor 15, first current sampling resistor 16, second current sampling resistor 17, first voltage sampling resistor 18, second voltage sampling resistor 19, third resistor 20, fourth resistor 21, fifth resistor 22, sixth resistor 23, seventh resistor 24, eighth resistor 25, discharge resistor 26, filter capacitor 27, LED lamp bead module 28, first resistor 29, second resistor 30, first capacitor 31, constant current main control IC 32, start-up unit 33, VCC auxiliary power supply line 34, constant power circuit 35, filter circuit 36, reference sampling module 37. Detailed Implementation

[0016] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0017] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] Please see Figures 1-2The figures shown are a circuit diagram and a block diagram of a low-frequency flicker dimming system with built-in VCC auxiliary power supply according to an embodiment of the present invention. The system includes a signal detection circuit, an input power interface 10 and an analog signal generator 13 connected to the input and output terminals of the signal detection circuit, a main control unit connected to the output terminal of the analog signal generator 13, and an LED lamp bead module 28 connected to the output terminal of the main control unit.

[0020] Preferably, the signal detection circuit includes a first resistor 29 (R3), a second resistor 30 (R3), and a first capacitor 31 (C4). The first resistor 29 and the second resistor 30 are connected in series between the positive and negative terminals of the input power interface 10, and the first capacitor 31 is connected in parallel across the second resistor 30. The signal detection circuit is used to detect the input signal and output the detection signal to the analog signal generator 13 (U3). The analog signal generator 13 is a standalone IC or an analog signal processing circuit. Its power supply pin is connected to the output terminal of the VCC auxiliary power supply line 34, and it outputs a 0-3.3V analog dimming signal to the DIM pin of the main control unit.

[0021] Furthermore, the system also includes a VCC auxiliary power supply line 34 connected to the output terminal of the secondary VCC winding of the host main output node or the host transformer. The output terminal of the VCC auxiliary power supply line 34 is connected to the analog signal generator 13 and the main control unit. The input terminal of the VCC auxiliary power supply line 34 is directly connected to the output terminal of the secondary VCC winding of the host main output node or the host transformer, and after rectification and filtering by rectifier diodes and rectifier filter capacitors 27, the output terminal is connected to the power supply pins of the analog signal generator 13 and the main control unit, thereby eliminating the need for a separate MCU power supply line unit and a frequency reduction lightning circuit unit.

[0022] Furthermore, the aforementioned main control unit includes a constant current main control IC 32 composed of a first IC 11 and a second IC 12. The power supply pin of the constant current main control IC 32 is connected to the output terminal of the VCC auxiliary power supply line 34. The main control unit also includes a startup unit 33, which includes a first startup resistor 14 and a second startup resistor 15 connected in series between the input power interface 10 and the constant current main control IC 32. The first startup resistor 14 (RIN1) and the second startup resistor 15 (RIN2) are connected between the power input interface and the startup pin of the constant current main control IC 32 to provide a high-voltage startup voltage and current.

[0023] The main control unit further includes a reference sampling module 37. The reference sampling module 37 includes a first current sampling resistor 16 and a second current sampling resistor 17 connected to the current detection pin of the constant current main control IC 32, and a first voltage sampling resistor 18 and a second voltage sampling resistor 19 connected to the voltage feedback pin of the constant current main control IC 32. The first current sampling resistor 16 (R1) and the second current sampling resistor 17 (R2) are connected to the current sampling pin of the constant current main control IC 32 for current reference sampling; the first voltage sampling resistor 18 (ROTP1) and the second voltage sampling resistor 19 (ROTP2) are connected to the voltage sampling pin of the constant current main control IC 32 for voltage reference sampling.

[0024] The main control unit further includes a constant power circuit 35, which includes a third resistor 20, a fourth resistor 21, and a fifth resistor 22 connected to the power adjustment pin of the first IC11, and a sixth resistor 23, a seventh resistor 24, and an eighth resistor 25 connected to the power adjustment pin of the second IC12. The third resistor 20 (RD1), the fourth resistor 21 (RD2), and the fifth resistor 22 (RD3) form the constant power circuit 35 of the first IC11 (U1), and the sixth resistor 23 (RD4), the seventh resistor 24 (RD5), and the eighth resistor 25 (RD6) form the constant power circuit 35 of the second IC12 (U2).

[0025] The low-flicker dimming system with built-in VCC auxiliary power supply also includes a filter circuit 36. The filter circuit 36 ​​includes a filter capacitor 27 located between the main control unit and the LED bead module 28, and a discharge resistor 26 connected in parallel across the filter capacitor 27. One end of the filter capacitor 27 (C1) is connected between the output terminal of the main control unit and the LED bead module 28, and the other end is grounded, used to filter out ripple current. The discharge resistor 26 (RDP1) is connected in parallel across the filter capacitor 27 (C1) to achieve safe discharge. The LED bead module 28 includes multiple LED beads (L1-Ln), the number of which is configured according to the line power. The input terminal of the LED bead module 28 is connected to the output terminal of the main control unit.

[0026] For ease of understanding, in some application scenarios of this embodiment, when the input power interface 10 is powered on, one power supply provides a detection signal to the analog signal generator 13 via R3, R4, and C4, and the other power supply provides startup voltage and current to U1 and U2 respectively via D1. After being filtered by C1, it provides voltage and current to the LEDs L1-Ln. At this time, U1 and U2 start up. After sampling the current references of R1 and R2 and the voltage references of ROTP1 and ROTP2, U1 and U2 perform internal logic operations to provide a constant current and voltage to L1-Ln.

[0027] When the dimming carrier signal input V+ is received, U3 performs internal calculations and outputs an analog signal 0-3.3V to the DIM of the main control units U1 and U2. U1 and U2 determine the output current by detecting the voltage of the DIM pin and performing calculations and comparisons. The brightness of the LED beads is adjusted from 0% to 100% by adjusting the current.

[0028] In summary, the low-flicker dimming system with built-in VCC auxiliary power supply in the above embodiments of this utility model eliminates the need for a separate MCU power supply line and a flicker removal circuit unit. It uses VCC auxiliary power supply to directly draw power from the main circuit of the host or the secondary winding of the transformer and combines it with analog signal processing. This reduces the number of components, significantly lowers hardware costs and circuit complexity, and improves system reliability. At the same time, it ensures soft dimming and low flicker, making it suitable for various scenarios such as general lighting, landscape lighting, and industrial lighting, thus enhancing the user experience.

[0029] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A low-frequency flicker dimming system with built-in VCC auxiliary power supply, characterized in that, The system includes a signal detection circuit, an input power interface (10) connected to the input and output terminals of the signal detection circuit, an analog signal generator (13), a main control unit connected to the output terminal of the analog signal generator (13), and an LED lamp bead module (28) connected to the output terminal of the main control unit. The system also includes a VCC auxiliary power supply line connected to the output terminal of the secondary VCC winding of the main circuit output node or the main transformer. The output terminal of the VCC auxiliary power supply line is connected to the analog signal generator (13) and the main control unit.

2. The low-frequency flicker dimming system with built-in VCC auxiliary power supply according to claim 1, characterized in that, The signal detection circuit includes a first resistor (29), a second resistor (30), and a first capacitor (31). The first resistor (29) and the second resistor (30) are connected in series between the positive and negative terminals of the input power interface (10), and the first capacitor (31) is connected in parallel across the two ends of the second resistor (30).

3. The low-frequency flicker dimming system with built-in VCC auxiliary power supply according to claim 1, characterized in that, The output of the analog signal generator (13) is connected to the DIM pin of the main control unit.

4. The low-frequency flicker dimming system with built-in VCC auxiliary power supply according to claim 1, characterized in that, The main control unit includes a constant current main control IC (32) composed of a first IC (11) and a second IC (12), and the power supply pin of the constant current main control IC (32) is connected to the output terminal of the VCC auxiliary power supply line.

5. The low-frequency flicker dimming system with built-in VCC auxiliary power supply according to claim 4, characterized in that, The main control unit also includes a startup unit (33), which includes a first startup resistor (14) and a second startup resistor (15) connected in series between the input power interface (10) and the constant current main control IC (32).

6. The low-frequency flicker dimming system with built-in VCC auxiliary power supply according to claim 4, characterized in that, The main control unit also includes a reference sampling module (37), which includes a first current sampling resistor (16) and a second current sampling resistor (17) connected to the current detection pin of the constant current main control IC (32), and a first voltage sampling resistor (19) and a second voltage sampling resistor (20) connected to the voltage feedback pin of the constant current main control IC (32).

7. The low-frequency flicker dimming system with built-in VCC auxiliary power supply according to claim 4, characterized in that, The main control unit also includes a constant power circuit (35), which includes a third resistor (20), a fourth resistor (21) and a fifth resistor (22) connected to the power adjustment pin of the first IC (11), and a sixth resistor (23), a seventh resistor (24) and an eighth resistor (25) connected to the power adjustment pin of the second IC (12).

8. The low-frequency flicker dimming system with built-in VCC auxiliary power supply according to claim 1, characterized in that, The low-frequency flicker dimming system with built-in VCC auxiliary power supply also includes a filter circuit (36), which includes a filter capacitor (27) located between the main control unit and the LED lamp bead module (28), and a discharge resistor (26) connected in parallel across the filter capacitor (27).

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