Dimming interface circuit

By introducing a dimming interface circuit into the LED lighting circuit, and using the ADC pin to collect and convert 0/1-10V analog signals into PWM signals, the problem of excessive dependence on special chips in the existing technology is solved, and the circuit parameters are flexible adjustment and cost reduction are achieved, and market competitiveness is enhanced.

CN223297730UActive Publication Date: 2025-09-02WUXI SEASTAR LIGHTING CO LTD
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Patent Information

Application Number
CN202422592907.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-26
Publication Date
2025-09-02
Estimated Expiration
2034-10-26

AI Technical Summary

Technical Problem

In the existing LED lighting circuit, the 0/1-10V dimming method is too heavy on special chips, and the circuit parameter setting and adjustment are not flexible enough, resulting in high production costs and insufficient market competitiveness.

Method used

A dimming interface circuit is adopted, including a power supply module, a constant current source module, a MCU module and an optocoupler. The ADC pin collects 0/1-10V analog signals and converts them into PWM signals, reducing dependence on special chips and achieving flexible adjustment of circuit parameters.

Benefits of technology

Reliance on dedicated chips is reduced, flexibility in circuit parameter setting and adjustment is improved, production costs are reduced, and the market competitiveness of the product is enhanced.

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Abstract

The utility model discloses a dimming interface circuit comprising a power supply module which comprises a U1, a capacitor C1, a capacitor C2, a U3, a resistor R6, a resistor R7 and a resistor R8. The constant current source module comprises a U2A, a U2B, a resistor R1, a resistor R2, a ground resistor R3, a resistor R4 and a resistor R5; an MCU module; the MCU module comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R9, a resistor C3, a resistor C4, a resistor C5 and a resistor U4; and an optocoupler U 5; according to the utility model, the dependence on a special chip is effectively reduced, the circuit parameter setting and adjustment of the lamp are more convenient, the production cost of the lamp is reduced, the product has better market competitiveness, and better economic benefits are created.
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Description

Technical Field

[0001] The utility model belongs to the technical field of LED lighting circuits, and particularly relates to a dimming interface circuit. Background Art

[0002] 0 / 1-10V dimming is a common dimming method for lamps and is widely used in the lighting market. However, it also has some disadvantages, such as excessive reliance on dedicated chips and limited flexibility in circuit parameter setting and adjustment. Utility Model Content

[0003] To address the aforementioned technical issues, the inventors, drawing on their extensive experience in LED lighting circuit technology, conducted research on existing lighting devices on the market. They discovered that existing lamps commonly use microcontrollers, Bluetooth, or Wi-Fi modules to control brightness, color temperature, on / off, and scene settings. Therefore, a solution could be achieved by using an ADC pin on a microcontroller, Bluetooth, or Wi-Fi module to capture the 0 / 1-10V analog signal from the dimming port and convert it into a PWM signal output, thus addressing the existing technical issues.

[0004] In order to achieve the above-mentioned object, the utility model adopts the following technical solution: a dimming interface circuit, comprising: a power supply module, the power supply module including U1, capacitor C1, capacitor C2, U3, resistor R6, resistor R7 and resistor R8; a constant current source module, the constant current source module including U2A, U2B, resistor R1, resistor R2, ground resistor R3, resistor R4, resistor R5; an MCU module; the MCU module including resistor R9, resistor R10, resistor R11, resistor R12, resistor R13, resistor R9, resistor C3, resistor C4, resistor C5, U4;

[0005] and optocoupler U5; the OUT end of U1 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to U3, the right side of U3 is connected to resistors R6 and R7, and a reference voltage is provided for U2A at the same time, pin 3 of U2A is connected to resistors R4 and R5 respectively, resistor R5 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to resistor R11, resistor R11 is connected to pin 7 of U4, pin 6 of U4 is connected to resistor R12, and the other end of the resistor R12 is connected to the optocoupler U5.

[0006] Furthermore, the IN terminal of U1 is connected to a 12V voltage, the GND terminal of U1 is grounded, and the two ends of U1 are respectively connected to capacitors C1 and C2.

[0007] Furthermore, pin 8 of U2A is connected to a 12V voltage, pin 2 of U2A is connected to resistor 2 and resistor 1 respectively, resistor 2 is grounded, the other end of resistor R1 and resistor R3 are connected to DIM+, DIM- is grounded, and pin 4 of U2A is grounded.

[0008] Furthermore, pin 6 of U2B is connected to resistor R5, pin 5 of U2B is connected to resistor R, pin 7 of U2B is connected to resistor R10, resistor R10 is connected to resistor R13, and resistor R13 is grounded.

[0009] Furthermore, U4 pin 1 is connected to a 5V voltage and capacitor C3, capacitor C3 is grounded, U4 pin 2 is connected to capacitor C5 and resistor R9, capacitor C5 is grounded, resistor R9 is connected to a 5V voltage, U4 pin 8 is connected to capacitor C4, capacitor C4 is grounded, and U4 converts the collected analog signal into a PWM signal.

[0010] Furthermore, the diode in the optocoupler U5 is grounded, and U5 isolates the PWM signal and outputs it to the main control chip.

[0011] In order to enable those skilled in the art to better understand the technical solutions in the application documents, the working principle of the constant current source circuit is explained in detail:

[0012] The pins corresponding to the op amp are represented by the component number plus the pin number, U2A-1, U2A-2, and so on. Figure 1 The resistance values ​​are R1=R2=R4=R5.

[0013] Because the U2B op amp is composed of a voltage follower, so: V U2B-7 =V U2B-5

[0014] (V U2B-7 Represents the voltage of pin 7, V U2B-5 Represents the voltage of pin 5, similar to the following)

[0015] U1 forms a common-phase summing and forward amplification circuit, so:

[0016]

[0017] I R3 =(Vo-V U2B-5 ) / R3=V ref / R3.

[0018] Compared with the existing technology, the utility model has the following beneficial effects: 1. It effectively reduces the dependence on dedicated chips; 2. It is more convenient to set and adjust the circuit parameters of the lamp; 3. It reduces the production cost of the lamp, which can make the product more competitive in the market and create better economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0020] The technical solutions of the present invention are further described in detail below through examples and in conjunction with the accompanying drawings. To facilitate understanding of the present invention, preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0021] It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0022] Example:

[0023] Reference Attachment Figure 1 A dimming interface circuit includes: a power supply module, the power supply module includes U1, capacitor C1, capacitor C2, U3, resistor R6, resistor R7 and resistor R8; a constant current source module, the constant current source module includes U2A, U2B, resistor R1, resistor R2, ground resistor R3, resistor R4, resistor R5; an MCU module; the MCU module includes resistors R9, resistor R10, resistor R11, resistor R12, resistor R13, resistor R9, resistor C3, resistor C4, resistor C5, U4; and an optocoupler U5; the OUT terminal of U1 is connected to the resistor R 8, the other end of resistor R8 is connected to U3, the right side of U3 is connected to resistors R6 and R7, and a reference voltage is provided for U2A at the same time, pin 3 of U2A is connected to resistors R4 and R5 respectively, resistor R5 is connected to one end of resistor R10, the other end of resistor R10 is connected to resistor R11, resistor R11 is connected to pin 7 of U4, pin 6 of U4 is connected to resistor R12, and the other end of resistor R12 is connected to optocoupler U5.

[0024] In this embodiment, the IN terminal of U1 is connected to a 12V voltage, the GND terminal of U1 is grounded, and the two ends of U1 are respectively connected to a capacitor C1 and a capacitor C2.

[0025] In this embodiment, pin 8 of U2A is connected to a 12V voltage, pin 2 of U2A is connected to resistor 2 and resistor 1 respectively, resistor 2 is grounded, the other end of resistor R1 and resistor R3 are connected to DIM+, DIM- is grounded, and pin 4 of U2A is grounded.

[0026] In this embodiment, pin 6 of U2B is connected to resistor R5, pin 5 of U2B is connected to resistor R, pin 7 of U2B is connected to resistor R10, resistor R10 is connected to resistor R13, and resistor R13 is grounded.

[0027] In this embodiment, U4 pin 1 is connected to a 5V voltage and capacitor C3, capacitor C3 is grounded, U4 pin 2 is connected to capacitor C5 and resistor R9, capacitor C5 is grounded, resistor R9 is connected to a 5V voltage, U4 pin 8 is connected to capacitor C4, capacitor C4 is grounded, and U4 converts the collected analog signal into a PWM signal.

[0028] In this embodiment, the diode in the optocoupler U5 is grounded, and U5 isolates the PWM signal and outputs it to the main control chip.

[0029] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A dimming interface circuit, characterized in that: include: A power supply module, comprising U1, capacitor C1, capacitor C2, U3, resistor R6, resistor R7 and resistor R8; A constant current source module, comprising U2A, U2B, a resistor R1, a resistor R2, a ground resistor R3, a resistor R4, and a resistor R5; MCU module; The MCU module includes resistors R9, R10, R11, R12, R13, R9, C3, C4, C5, and U4; and optocoupler U 5; The OUT end of U1 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to U3, the right side of U3 is connected to the resistor R6 and the resistor R7, and a reference voltage is provided for U2A at the same time. The pin 3 of U2A is connected to the resistors R4 and R5 respectively, the resistor R5 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the resistor R11, the resistor R11 is connected to the pin 7 of U4, the pin 6 of U4 is connected to the resistor R12, and the other end of the resistor R12 is connected to the optocoupler U5.

2. A dimming interface circuit according to claim 1, characterized in that: The IN terminal of U1 is connected to a 12V voltage, the GND terminal of U1 is grounded, and the two ends of U1 are also connected to capacitors C1 and C2 respectively.

3. The dimming interface circuit according to claim 1, characterized in that: Pin 8 of U2A is connected to 12V voltage, pin 2 of U2A is connected to resistor 2 and resistor 1 respectively, resistor 2 is grounded, the other end of resistor R1 and resistor R3 are connected to DIM+, DIM- is grounded, and pin 4 of U2A is grounded.

4. The dimming interface circuit according to claim 1, characterized in that: Pin 6 of U2B is connected to resistor R5, pin 5 of U2B is connected to resistor R, pin 7 of U2B is connected to resistor R10, resistor R10 is connected to resistor R13, and resistor R13 is grounded.

5. The dimming interface circuit according to claim 1, characterized in that: U4 pin 1 is connected to a 5V voltage and capacitor C3, capacitor C3 is grounded, U4 pin 2 is connected to capacitor C5 and resistor R9, capacitor C5 is grounded, resistor R9 is connected to a 5V voltage, U4 pin 8 is connected to capacitor C4, capacitor C4 is grounded, and U4 converts the collected analog signal into a PWM signal.

6. The dimming interface circuit according to claim 1, characterized in that: The diode in the optocoupler U5 is grounded, and U5 isolates the PWM signal and outputs it to the main control chip.