0-10v isolated dimming circuit

Abstract

This utility model relates to the field of LED dimming technology and discloses a 0-10V isolated dimming circuit comprising: an input module for receiving a 0-10V input voltage signal; an operational amplifier U1 connected to the input module for converting the input voltage signal into a current signal; an optocoupler U2 connected to the operational amplifier U1 for achieving isolated signal transmission; an operational amplifier U3 connected to the optocoupler U2 for restoring the isolated current signal to an output voltage signal with a 1:1 ratio to the input voltage signal; an output module connected to the operational amplifier U3 for outputting a 0-10V dimming control signal; and a feedback module connected to the operational amplifier U3 for providing feedback on the signal to stabilize the output voltage. By using an operational amplifier in conjunction with an optocoupler to convert the voltage signal into a current signal and perform isolated transmission, and then restore it to an output voltage signal with a 1:1 ratio to the input voltage signal, safe isolated transmission and precise dimming control of the 0-10V voltage signal are achieved. The circuit is simple and reliable, with high signal transmission accuracy, and can proportionally amplify or reduce the output voltage to meet different dimming requirements.

Description

Technical Field

[0001] This utility model relates to the field of LED dimming technology, and in particular to a 0-10V isolated dimming circuit. Background Technology

[0002] A dimming circuit is an electronic control circuit used to adjust the brightness of a light source (such as an incandescent lamp, LED lamp, or fluorescent lamp). Its core function is to achieve continuous or stepped brightness adjustment from completely off to maximum brightness by changing the electrical power input to the light source (such as voltage, current, or power supply time ratio).

[0003] Existing 0-10V dimming circuits have several problems: 1. Non-isolated 0-10V dimming circuits, lacking isolation measures, pose a risk of electric shock when paired with high-voltage, non-isolated power supplies. 2. Using a microcontroller to modulate the signal in the dimming circuit results in complex circuitry, high cost, and the need for software engineers to write the program. The circuit must first modulate the voltage signal into a PWM signal, then transmit it through optocoupler isolation, and finally modulate the PWM signal back into a 0-10V voltage signal. 3. Directly transmitting the voltage signal using optocouplers is ineffective in the 0-1V range due to the optocoupler's threshold voltage; signals below 1V cannot be effectively transmitted. It can only transmit voltage signals from 1-10V. Utility Model Content

[0004] Based on the above, the purpose of this utility model is to provide a 0-10V isolated dimming circuit to achieve safe isolated transmission and precise dimming control of 0-10V voltage signals.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a 0-10V isolated dimming circuit, comprising:

[0007] The input module is used to receive input voltage signals of 0-10V;

[0008] Operational amplifier U1, connected to the input module, is used to convert the input voltage signal into a current signal;

[0009] Optical coupler U2 is connected to operational amplifier U1 and is used to achieve isolated signal transmission;

[0010] Operational amplifier U3, connected to optocoupler U2, is used to restore the isolated current signal to an output voltage signal with a 1:1 ratio to the input voltage signal;

[0011] The output module, connected to the operational amplifier U3, is used to output a 0-10V dimming control signal;

[0012] The feedback module, connected to the operational amplifier U3, is used to provide feedback on the signal to stabilize the output voltage.

[0013] Furthermore, the input module includes a 0-10V IN port and resistors R1, R2, and R3 for current limiting and biasing.

[0014] Furthermore, the output terminal of the operational amplifier U1 is connected to the input terminal of the optocoupler U2, and the output terminal of the optocoupler U2 is connected to the input terminal of the operational amplifier U3.

[0015] Furthermore, the output terminal of the operational amplifier U3 is connected to the output module, which includes a 0-10V+OUT port and a 0-10V-OUT port.

[0016] Furthermore, the feedback module includes a resistor R7, which is connected to the inverting input terminal of the operational amplifier U3.

[0017] On the other hand, a 0-10V isolated dimming circuit is provided, including: an input EMC filter circuit, an input rectifier filter circuit, a PFC power factor correction circuit, a flyback converter circuit, a PWM flyback main control circuit, an output rectifier filter circuit, an output voltage detection feedback circuit, and a 0-10V isolated transmission dimming circuit;

[0018] The 0-10V isolated transmission dimming circuit includes an operational amplifier U1, an optocoupler U2, an operational amplifier U3, and a feedback module. The operational amplifier U1 converts the input 0-10V voltage signal into a current signal, the optocoupler U2 realizes signal isolation transmission, the operational amplifier U3 restores the isolated current signal to an output voltage signal that is 1:1 with the input voltage, and the feedback module is used to stabilize the output signal.

[0019] Furthermore, the input EMC filter circuit is used to filter out electromagnetic interference in the input power supply, the input rectifier filter circuit is used to convert AC input to DC and perform preliminary filtering, the PFC power factor correction circuit is used to improve the power factor, the flyback converter circuit is used for voltage transformation and electrical isolation, the PWM flyback master control circuit is used to control the operation of the flyback converter circuit, the output rectifier filter circuit is used to convert high-frequency AC to DC and perform filtering, and the output voltage detection feedback circuit is used to detect the output voltage and feed it back to the PWM flyback master control circuit to achieve closed-loop control.

[0020] Furthermore, the output terminal of the operational amplifier U1 is connected to the input terminal of the optocoupler U2, the output terminal of the optocoupler U2 is connected to the input terminal of the operational amplifier U3, and the output terminal of the operational amplifier U3 is connected to the output module for outputting a 0-10V dimming control signal.

[0021] Furthermore, the feedback module includes a resistor R7, which is connected between the inverting input terminal and the output terminal of the operational amplifier U3.

[0022] Furthermore, the optocoupler U2 is a precision linear optocoupler used to isolate transmitted signals.

[0023] The beneficial effects of this utility model are as follows:

[0024] This invention proposes a 0-10V isolated dimming circuit. Through an operational amplifier and optocoupler, the voltage signal is converted into a current signal and transmitted in isolation. It is then restored to an output voltage signal that is 1:1 with the input voltage signal, achieving safe isolated transmission and precise dimming control of the 0-10V voltage signal. The circuit is simple and reliable, with high signal transmission accuracy, and can proportionally amplify or reduce the output voltage to meet different dimming requirements. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0026] Figure 1 A module diagram of a 0-10V isolated dimming circuit is provided for Embodiment 1 of this utility model;

[0027] Figure 2 A circuit diagram of a 0-10V isolated dimming circuit is provided for Embodiment 1 of this utility model;

[0028] Figure 3 A module diagram of a 0-10V isolated dimming circuit is provided for Embodiment 2 of this utility model;

[0029] Figure 4 The circuit diagram of the input EMC filter circuit provided in Embodiment 2 of this utility model;

[0030] Figure 5 A circuit diagram of the input rectifier and filter circuit provided in Embodiment 2 of this utility model;

[0031] Figure 6 Circuit diagram of the PFC power factor correction circuit provided in Embodiment 2 of this utility model;

[0032] Figure 7 A circuit diagram of the flyback converter circuit provided in Embodiment 2 of this utility model;

[0033] Figure 8 The circuit diagram of the PWM flyback master control circuit provided in Embodiment 2 of this utility model;

[0034] Figure 9 A circuit diagram of the output rectifier and filter circuit provided in Embodiment 2 of this utility model;

[0035] Figure 10 This is the output voltage detection feedback circuit provided in Embodiment 2 of the present invention;

[0036] Figure 11 The circuit diagram of the 0-10V isolated transmission dimming circuit provided in Embodiment 2 of this utility model;

[0037] Figure 12 The circuit diagram of the 0-10V dimming circuit provided in Embodiment 2 of this utility model. Detailed Implementation

[0038] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] Example 1

[0043] like Figure 1 and 2 As shown, this utility model embodiment provides a 0-10V isolated dimming circuit, including: an input module for receiving a 0-10V input voltage signal; an operational amplifier U1 connected to the input module for converting the input voltage signal into a current signal; an optocoupler U2 connected to the operational amplifier U1 for achieving isolated signal transmission; an operational amplifier U3 connected to the optocoupler U2 for restoring the isolated current signal to an output voltage signal with a 1:1 ratio to the input voltage signal; an output module connected to the operational amplifier U3 for outputting a 0-10V dimming control signal; and a feedback module connected to the operational amplifier U3 for providing feedback on the signal to stabilize the output voltage.

[0044] This invention proposes a 0-10V isolated dimming circuit. Through an operational amplifier and optocoupler, the voltage signal is converted into a current signal and transmitted in isolation. It is then restored to an output voltage signal that is 1:1 with the input voltage signal, achieving safe isolated transmission and precise dimming control of the 0-10V voltage signal. The circuit is simple and reliable, with high signal transmission accuracy, and can proportionally amplify or reduce the output voltage to meet different dimming requirements.

[0045] In some embodiments, such as Figure 2As shown, the input module serves as the signal entry point of the circuit. The input module includes a 0-10V IN port and resistors R1, R2, and R3 for current limiting and biasing, ensuring that the input signal is stable and fed into the subsequent circuit modules within the appropriate level range.

[0046] In some embodiments, such as Figure 2 As shown, the output terminal of operational amplifier U1 is connected to the input terminal of optocoupler U2, and the output terminal of optocoupler U2 is connected to the input terminal of operational amplifier U3. Specifically, operational amplifier U1 is connected to the input module, and its function is to linearly convert the input voltage signal into a current signal. Furthermore, it enhances the signal's anti-interference capability to a certain extent, ensuring the integrity and stability of the signal during transmission, which is key to achieving precise dimming control. Optocoupler U2 utilizes the principle of optocoupler coupling to accurately transmit the current signal output by operational amplifier U1 to operational amplifier U3 without directly conducting the circuit. This process blocks the electrical loop of the circuit components, eliminating the risk of electric shock at the source, while ensuring the efficiency and accuracy of signal transmission. Operational amplifier U3 faithfully restores the current signal to a 1:1 output voltage signal, ensuring a high degree of matching between the output and input signals, minimizing signal distortion, and achieving precise dimming control.

[0047] In some embodiments, such as Figure 2 As shown, the output terminal of the operational amplifier U3 is connected to the output module, which includes a 0-10V+ OUT port and a 0-10V- OUT port, providing precise dimming control signals to external dimming devices (such as LED lamps) to ensure that the external load can operate stably according to the set dimming requirements.

[0048] In some embodiments, such as Figure 2 As shown, the feedback module includes a resistor R7, which is connected to the inverting input terminal of operational amplifier U3. Specifically, the feedback module is connected to operational amplifier U3 to form a closed-loop control circuit. It automatically adjusts circuit parameters by monitoring the output signal in real time and comparing it with the input signal to ensure the stability of the output signal.

[0049] Example 2

[0050] This embodiment of the utility model is based on Embodiment 1, such as... Figures 3 to 12As shown, a 0-10V isolated dimming circuit is provided, including: an input EMC filter circuit, an input rectifier filter circuit, a PFC power factor correction circuit, a flyback converter circuit, a PWM flyback main control circuit, an output rectifier filter circuit, an output voltage detection feedback circuit, a 0-10V dimming circuit, and a 0-10V isolated transmission dimming circuit; wherein, the 0-10V isolated transmission dimming circuit includes an operational amplifier U1, an optocoupler U2, an operational amplifier U3, and a feedback module. The operational amplifier U1 converts the input 0-10V voltage signal into a current signal, the optocoupler U2 realizes signal isolation transmission, the operational amplifier U3 restores the isolated current signal to an output voltage signal with a 1:1 ratio to the input voltage, and the feedback module is used to stabilize the output signal.

[0051] In some embodiments, such as Figure 4 As shown, the input EMC filter circuit is used to filter out electromagnetic interference in the input power supply; as Figure 5 As shown, the input rectifier and filter circuit is used to convert the AC input to DC and perform preliminary filtering; as Figure 6 As shown, the PFC (Power Factor Correction) circuit is used to improve the power factor; as Figure 7 As shown, the flyback converter circuit is used for voltage transformation and electrical isolation; as Figure 8 As shown, the PWM flyback master control circuit is used to control the operation of the flyback converter circuit; as Figure 9 As shown, the output rectifier and filter circuit is used to convert high-frequency AC to DC and perform filtering, such as... Figure 10 As shown, the output voltage detection feedback circuit is used to detect the output voltage and feed it back to the PWM flyback main control circuit to achieve closed-loop control.

[0052] In some embodiments, such as Figure 11 As shown, the output terminal of the operational amplifier U1 is connected to the input terminal of the optocoupler U2, the output terminal of the optocoupler U2 is connected to the input terminal of the operational amplifier U3, and the output terminal of the operational amplifier U3 is connected to the output module for outputting a 0-10V dimming control signal.

[0053] In some embodiments, such as Figure 11 As shown, the feedback module includes a resistor R7, which is connected between the inverting input and output terminals of operational amplifier U3; as Figure 12 The 0-10V dimming circuit includes a resistor R7 connected between the inverting input and output of the operational amplifier U3, and a capacitor C2 connected between the inverting input power supply of the operational amplifier U3 and ground, for filtering the power supply to stabilize the output voltage.

[0054] In some embodiments, such as Figure 11 As shown, the optocoupler U2 is a precision linear optocoupler used for signal isolation. This precision linear optocoupler consists of an infrared LED illuminating an isolation feedback photodiode K1 and an output photodiode K2, arranged in a bifurcated layout. The feedback photodiode K2 captures a portion of the luminous flux from the LED and generates a control signal that can be used to adjust the LED's drive current. This technique compensates for the nonlinear time and temperature characteristics of the LED. The output signal generated by the output photodiode K2 is linearly proportional to the servo luminous flux emitted by the LED.

[0055] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A 0-10V isolated dimming circuit, characterized in that, include: The input module is used to receive input voltage signals of 0-10V; Operational amplifier U1, connected to the input module, is used to convert the input voltage signal into a current signal; Optical coupler U2 is connected to operational amplifier U1 and is used to achieve isolated signal transmission; Operational amplifier U3, connected to optocoupler U2, is used to restore the isolated current signal to an output voltage signal with a 1:1 ratio to the input voltage signal; The output module, connected to the operational amplifier U3, is used to output a 0-10V dimming control signal; The feedback module, connected to the operational amplifier U3, is used to provide feedback on the signal to stabilize the output voltage.

2. A 0-10V isolated dimming circuit according to claim 1, characterized in that, The input module includes a 0-10V IN port and resistors R1, R2, and R3 for current limiting and biasing.

3. The 0-10V isolated dimming circuit of claim 1, wherein, The output terminal of the operational amplifier U1 is connected to the input terminal of the optocoupler U2, and the output terminal of the optocoupler U2 is connected to the input terminal of the operational amplifier U3.

4. The 0-10V isolated dimming circuit of claim 1, wherein, The output terminal of the operational amplifier U3 is connected to the output module, which includes a 0-10V+ OUT port and a 0-10V- OUT port.

5. The 0-10V isolated dimming circuit of claim 1, wherein, The feedback module includes a resistor R7, which is connected to the inverting input terminal of the operational amplifier U3.

6. A 0-10V isolated dimming circuit, characterized in that, include: Input EMC filter circuit, input rectifier filter circuit, PFC power factor correction circuit, flyback converter circuit, PWM flyback main control circuit, output rectifier filter circuit, output voltage detection feedback circuit and 0-10V isolated transmission dimming circuit; The 0-10V isolated transmission dimming circuit includes an operational amplifier U1, an optocoupler U2, an operational amplifier U3, and a feedback module. The operational amplifier U1 converts the input 0-10V voltage signal into a current signal, the optocoupler U2 realizes signal isolation transmission, the operational amplifier U3 restores the isolated current signal to an output voltage signal that is 1:1 with the input voltage, and the feedback module is used to stabilize the output signal.

7. A 0-10V isolated dimming circuit according to claim 6, characterized in that: The input EMC filter circuit is used to filter out electromagnetic interference in the input power supply; the input rectifier filter circuit is used to convert AC input to DC and perform preliminary filtering; the PFC power factor correction circuit is used to improve the power factor; the flyback converter circuit is used for voltage transformation and electrical isolation; the PWM flyback master control circuit is used to control the operation of the flyback converter circuit; the output rectifier filter circuit is used to convert high-frequency AC to DC and perform filtering; and the output voltage detection feedback circuit is used to detect the output voltage and feed it back to the PWM flyback master control circuit to achieve closed-loop control.

8. A 0-10V isolated dimming circuit according to claim 6, characterized in that: The output terminal of the operational amplifier U1 is connected to the input terminal of the optocoupler U2, the output terminal of the optocoupler U2 is connected to the input terminal of the operational amplifier U3, and the output terminal of the operational amplifier U3 is connected to the output module for outputting a 0-10V dimming control signal.

9. The 0-10V isolated dimming circuit of claim 6, wherein: The feedback module includes a resistor R7, which is connected between the inverting input and output of the operational amplifier U3.

10. The 0-10V isolated dimming circuit of claim 6, wherein: The light coupling U2 is a precision linear photoelectric coupler, used for isolating transmission signals.

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