Low-noise control system of LED intelligent dimming control device

Abstract

The invention discloses a low-noise control system of an LED intelligent dimming control device. The input module is used for receiving commercial power and outputting the commercial power after filtering and comprises a CBB capacitor C1, a CBB capacitor C2 and an inductor L1, one end of the CBB capacitor C1 is connected with the input end, the other end of the CBB capacitor C1 is connected with one end of the inductor L1, one end of the CBB capacitor C2 is connected with the input end, and the other end of the CBB capacitor C2 is connected with the other end of the inductor L1, so that a pi-shaped filtering loop is formed; the AC detection end of the main control unit U1 is grounded through a resistor R7 and a capacitor C6, and the AC detection end is further connected with the input module through a resistor R6, a resistor R5 and a resistor R4 in sequence and used for collecting AC current information; the current detection end of the main control unit U1 is connected with one end of the resistor R14, and the other end of the resistor R14 is connected with one end of the CBB capacitor C1 and one end of the CBB capacitor C2 and used for collecting commercial power current information. The programming end of the main control unit U1 adjusts circuit parameters according to commercial power current information collected by the AC detection end and the current detection end, so that noise is reduced.

Description

Technical Field

[0001] The invention relates to the field of LED power supplies, and in particular to a low-noise control system for an LED intelligent dimming control device. Background Art

[0002] With the rapid development of LED lighting technology, intelligent lighting is gradually replacing traditional lighting and integrating into people's lives. Compared with traditional lighting technology, LED control devices that can provide a variety of intelligent functions such as dimming, color adjustment, and timing control provide consumers with a more comfortable and efficient lighting experience.

[0003] Existing LED dimming control devices are prone to noise during the dimming process, mainly from the mechanical vibrations generated by inductors, transformers, capacitors and switch components, especially during low-frequency dimming. These noises not only affect the user experience, but frequent mechanical vibrations also affect the stability and life of the control system and increase the failure rate. Summary of the invention

[0004] In order to solve the above problems, the present technical solution provides a low-noise control system for an LED intelligent dimming control device.

[0005] To achieve the above purpose, the technical solution is as follows: LED intelligent dimming control device low noise control system, including; An input module, used for receiving the mains power and outputting it after filtering, comprising a CBB capacitor C1, a CBB capacitor C2 and an inductor L1, wherein one end of the CBB capacitor C1 is connected to the input end, and the other end is connected to one end of the inductor L1, and one end of the CBB capacitor C2 is connected to the input end, and the other end is connected to the other end of the inductor L1, so as to form a π-type filtering loop; A main control unit U1, wherein an AC detection terminal of the main control unit U1 is grounded through a resistor R7 and a capacitor C6, and the AC detection terminal is also connected to an input module through resistors R6, R5, and R4 in sequence, for collecting AC current information; The current detection end of the main control unit U1 is connected to one end of the resistor R14, and the other end of the resistor R14 is connected to one end of the CBB capacitor C1 and the CBB capacitor C2 respectively, for collecting the mains current information; The programming end of the main control unit U1 adjusts circuit parameters according to the mains current information collected by the AC detection end and the current detection end, thereby reducing noise.

[0006] In some embodiments, a dimming module is also included; A dimming unit U5, wherein a first dimming terminal of the dimming unit U5 is connected to the gate of the MOS tube Q5 through a resistor R40, a source of the dimming unit U5 is grounded, a drain of the dimming unit U5 is connected to a voltage V+ through a capacitor C23 and a diode D14 in sequence, and the drain of the dimming unit U5 is connected to the voltage V+ through an inductor L2 and a light-emitting diode D15 in sequence; The second dimming end of the dimming unit U5 is connected to the gate of the MOS tube Q4 through the resistor R38, the source is grounded, the drain is connected to the voltage V+ through the capacitor C22 and the diode D13 in sequence, and the drain is also connected to the voltage V+ through the inductor L3 and the light-emitting diode D16 in sequence.

[0007] In some embodiments, an optical coupler U2 is also included; The positive electrode of the light-emitting end of the optical coupler U2 is connected to the voltage V+ through the resistor R31, and the voltage V+ is connected to the positive electrode of the reference unit U3 through the resistor R33, the resistor R34 and the resistor R35 in sequence, the common terminal of the resistor R34 and the resistor R35 is connected to the reference end of the reference unit U3, and the negative electrode of the reference unit U3 is connected to the negative electrode of the light-emitting end of the optical coupler U2; The emitter of the optical coupler U2 is grounded, and the collector is connected to the main control unit U1.

[0008] In some embodiments, the CBB capacitor C1 and the CBB capacitor C2 are packaged using a vacuum hot pressing process and a box-type epoxy resin curing process.

[0009] In some embodiments, when the system is assembled, sound insulation cotton is arranged at the positions of the transformer and the inductor in the shell.

[0010] The beneficial effects of this application are: In this application, under an environmental noise of 15dB, the noise decibel at 0.2 meters away from the control device is reduced from 34.5dB before optimization to 22dB, and the noise problem is effectively improved and suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0012] Figure 1 is a schematic diagram of the structure of an input module according to an embodiment of the present invention; Figure 2 is a schematic diagram of the structure of a main control module according to an embodiment of the present invention; Figure 3 is a schematic structural diagram of a dimming module according to an embodiment of the present invention; Figure 4 Schematic diagram of the shell structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0013] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0014] Please refer to Figure 1-4 As shown, the LED intelligent dimming control device has a low noise control system, including: An input module, used for receiving the mains power and outputting it after filtering, comprising a CBB capacitor C1, a CBB capacitor C2 and an inductor L1, wherein one end of the CBB capacitor C1 is connected to the input end, and the other end is connected to one end of the inductor L1, and one end of the CBB capacitor C2 is connected to the input end, and the other end is connected to the other end of the inductor L1, so as to form a π-type filtering loop; A main control unit U1, wherein an AC detection terminal of the main control unit U1 is grounded through a resistor R7 and a capacitor C6, and the AC detection terminal is also connected to an input module through resistors R6, R5, and R4 in sequence, for collecting AC current information; The current detection end of the main control unit U1 is connected to one end of the resistor R14, and the other end of the resistor R14 is connected to one end of the CBB capacitor C1 and the CBB capacitor C2 respectively, for collecting the mains current information; The programming end of the main control unit U1 adjusts circuit parameters according to the mains current information collected by the AC detection end and the current detection end, thereby reducing noise.

[0015] When the existing intelligent LED control device is dimming, the EMC suppression device of the input part works in a 100Hz low-frequency circuit, and the inductor and CBB capacitor and other devices are prone to generate low-frequency noise when working; the transformer and inductor in the main circuit part are prone to electromagnetic vibration and noise under the action of high-frequency current; in the dimming circuit, the dimming frequency control below 14KHz will produce obvious noise, especially in the dimming process. In response to the above problems, the invention method from the following three aspects systematically improves the noise problem and realizes the requirements for high-quality and low-noise products.

[0016] In the input EMC low-frequency suppression circuit, a π-type filtering loop is formed by CBB capacitors C1, C2 and inductor L1. After filtering, it is connected to the PFC circuit. When the PFC circuit performs harmonic current calibration, the current in the circuit loop is adjusted online to a large extent, which causes the CBB capacitors C1, C2 and inductor L1 to produce power frequency howling. In order to suppress the noise component, the CBB capacitor adopts a vacuum hot pressing process and a box-type epoxy resin curing process to encapsulate it, so that the vibration between the two layers of polypropylene film of the capacitor is reduced, thereby reducing noise. At the same time, all transformers and inductors are vacuum impregnated, and soft mute glue is injected into the air gap between the core column of the transformer to suppress noise.

[0017] In order to reduce the noise generated by the harmonic current calibration of the PFC circuit, a programmable digital PFC+LLC integrated control IC (HR1270) is used to adjust the peak value of each phase angle of the PFC harmonic current online through the IC serial port (P17 pin) and IC (P15 pin GND), and the AC input is sampled through AC detection (P2 pin ACin) and current detection (P3 pin), and the circuit parameters are automatically adjusted to reduce the noise.

[0018] In some embodiments, a dimming module is also included; A dimming unit U5, wherein a first dimming terminal of the dimming unit U5 is connected to the gate of the MOS tube Q5 through a resistor R40, a source of the dimming unit U5 is grounded, a drain of the dimming unit U5 is connected to a voltage V+ through a capacitor C23 and a diode D14 in sequence, and the drain of the dimming unit U5 is connected to the voltage V+ through an inductor L2 and a light-emitting diode D15 in sequence; The second dimming end of the dimming unit U5 is connected to the gate of the MOS tube Q4 through the resistor R38, the source is grounded, the drain is connected to the voltage V+ through the capacitor C22 and the diode D13 in sequence, and the drain is also connected to the voltage V+ through the inductor L3 and the light-emitting diode D16 in sequence.

[0019] Since the human ear is more sensitive to noise below 14kHz, the output frequency of dimming modules and controllers currently on the market is generally below 8kHz, and the noise is more obvious during dimming and color adjustment. Therefore, in the dimming and color adjustment circuit of the present invention, the dimming unit U5 sends PWM signals of different frequencies to the MOS tube, and the dimming and color adjustment PWM frequency is increased to 16KHz. At the same time, the inductor L2, L3, the diode D13, D14, and the capacitor C22, C23 form a DLC noise ripple suppression circuit, which effectively reduces the noise.

[0020] In some embodiments, an optical coupler U2 is also included; The positive electrode of the light-emitting end of the optical coupler U2 is connected to the voltage V+ through the resistor R31, and the voltage V+ is connected to the positive electrode of the reference unit U3 through the resistor R33, the resistor R34 and the resistor R35 in sequence, the common terminal of the resistor R34 and the resistor R35 is connected to the reference end of the reference unit U3, and the negative electrode of the reference unit U3 is connected to the negative electrode of the light-emitting end of the optical coupler U2; The emitter of the optical coupler U2 is grounded, and the collector is connected to the main control unit U1.

[0021] In some embodiments, the CBB capacitor C1 and the CBB capacitor C2 are packaged using a vacuum hot pressing process and a box-type epoxy resin curing process.

[0022] In some embodiments, when the system is assembled, sound insulation cotton is arranged at the positions of the transformer and the inductor in the shell.

[0023] In order to meet the high requirements of low-noise use in recording studios and other places, in terms of the shell structure, sound insulation cotton is added to the four sides of the shell for components such as transformers and inductors that are prone to generate low-frequency noise. The double noise reduction system method ensures the ultra-low noise requirements.

[0024] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application. Other principles and basic structures that are the same or similar to those of the present application are within the protection scope of the present application.

Claims

1. LED intelligent dimming control device low noise control system, characterized by: include; An input module, used for receiving the mains power and outputting it after filtering, comprising a CBB capacitor C1, a CBB capacitor C2 and an inductor L1, wherein one end of the CBB capacitor C1 is connected to the input end, and the other end is connected to one end of the inductor L1, and one end of the CBB capacitor C2 is connected to the input end, and the other end is connected to the other end of the inductor L1, so as to form a π-type filtering loop; A main control unit U1, wherein an AC detection terminal of the main control unit U1 is grounded through a resistor R7 and a capacitor C6, and the AC detection terminal is also connected to an input module through resistors R6, R5, and R4 in sequence, for collecting AC current information; The current detection end of the main control unit U1 is connected to one end of the resistor R14, and the other end of the resistor R14 is connected to one end of the CBB capacitor C1 and the CBB capacitor C2 respectively, for collecting the mains current information; The programming end of the main control unit U1 adjusts circuit parameters according to the mains current information collected by the AC detection end and the current detection end, thereby reducing noise.

2. The low noise control system of the LED intelligent dimming control device according to claim 1 is characterized in that: It also includes a dimming module; A dimming unit U5, wherein a first dimming terminal of the dimming unit U5 is connected to the gate of the MOS tube Q5 through a resistor R40, a source of the dimming unit U5 is grounded, a drain of the dimming unit U5 is connected to a voltage V+ through a capacitor C23 and a diode D14 in sequence, and the drain of the dimming unit U5 is connected to the voltage V+ through an inductor L2 and a light-emitting diode D15 in sequence; The second dimming end of the dimming unit U5 is connected to the gate of the MOS tube Q4 through the resistor R38, the source is grounded, the drain is connected to the voltage V+ through the capacitor C22 and the diode D13 in sequence, and the drain is also connected to the voltage V+ through the inductor L3 and the light-emitting diode D16 in sequence.

3. The low noise control system of the LED intelligent dimming control device according to claim 2 is characterized in that: It also includes an optocoupler U2; The positive electrode of the light-emitting end of the optical coupler U2 is connected to the voltage V+ through the resistor R31, and the voltage V+ is connected to the positive electrode of the reference unit U3 through the resistor R33, the resistor R34 and the resistor R35 in sequence, the common terminal of the resistor R34 and the resistor R35 is connected to the reference end of the reference unit U3, and the negative electrode of the reference unit U3 is connected to the negative electrode of the light-emitting end of the optical coupler U2; The emitter of the optical coupler U2 is grounded, and the collector is connected to the main control unit U1.

4. The low noise control system of the LED intelligent dimming control device according to claim 1 is characterized in that: The CBB capacitor C1 and the CBB capacitor C2 are packaged using a vacuum hot pressing process and a box-type epoxy resin curing process.

5. The low noise control system of the LED intelligent dimming control device according to claim 1, characterized in that: When the system is assembled, sound insulation cotton is arranged at the positions of the transformer and the inductor in the shell.

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