Dimming device and LED driving device having same
By using an optocoupler, a port of a controller, and a series-parallel structure of a switch and a resistor or a sliding rheostat in the LED lighting system, the resistance value is converted into a frequency signal for isolated transmission, which solves the problems of high cost, large area and large port occupation in traditional methods, and achieves a low-cost and high-accuracy dimming effect.
Patent Information
- Application Number
- CN202422496093.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-10-15
AI Technical Summary
In traditional LED lighting systems, the isolation method between the dimmer and LED driver has the problems of high cost, large PCB area and multiple controller ports.
Using an optocoupler, a port of a controller, and a series-parallel structure of a switch and a resistor or a sliding rheostat, the resistance value is converted into a frequency signal through an impedance-frequency conversion network, and isolated and transmitted through an optocoupler. The edge trigger is used to identify the frequency and control the output current of the LED driver.
A low-cost isolated dimming solution is achieved, which reduces the PCB layout area and controller port occupation, and improves the dimming accuracy and circuit simplicity.
Smart Images
Figure CN223348820U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of electronic technology, in particular to circuit design, and more particularly to a dimming device and an LED driving device having the dimming device. Background Art
[0002] In LED lighting systems, isolation between the dimmer and LED driver is a key design consideration, as it impacts not only product safety but also dimming accuracy and reliability. Traditional isolation methods typically employ optocouplers, devices that utilize optical signaling to achieve electrical isolation. Optocouplers consist of a light emitter (such as an LED) and a photodetector (such as a phototransistor), encapsulated in an opaque carrier to ensure electrical isolation.
[0003] In practical applications, such as Figure 6 As shown, the dimmer can include multiple dip switches S1-SN, each representing a different brightness setting. To achieve dimming, the signal from each dip switch needs to be transmitted to the LED driver. According to the traditional design, each dip switch requires a separate optocoupler to transmit the signal. Therefore, each dip switch is connected to a corresponding optocoupler, such as Figure 6 The optocoupler 6001-600 shown N These signals are then received by analog-to-digital converter (ADC) sampling ports ADC1-ADCN of the controller 603, and the controller 603 controls the LED driver according to these signals to adjust the brightness of the LED.
[0004] However, this approach has some limitations. First, the use of multiple optocouplers increases cost and complexity, as each DIP switch requires an optocoupler. Second, the need for multiple optocouplers increases the PCB footprint. Furthermore, the controller requires multiple ADC sampling ports, which increases the number of controller ports.
[0005] Therefore, it is necessary to develop a dimming device that can achieve isolated dimming while reducing the cost of the dimming device, making the PCB layout area of the dimming device small, and reducing the occupation of the controller port. Utility Model Content
[0006] (1) Technical issues
[0007] In response to the above-mentioned shortcomings of the prior art, the present disclosure provides an isolated dimming method for an LED driver using only one optocoupler, one port of a controller, and a series-parallel structure of a switch and a resistor or a sliding rheostat, thereby solving the above-mentioned prior art problems.
[0008] (2) Technical solution
[0009] To achieve the above objectives, the present disclosure is implemented through the following technical solutions:
[0010] According to one aspect of an embodiment of the present disclosure, a dimming device is provided, comprising: a dimmer, the dimmer comprising a resistor component whose resistance value can be adjusted; an impedance-frequency conversion network, the impedance-frequency conversion network being connected to the resistor component and being used to convert the resistance value of the dimmer into a frequency signal, wherein different resistance values correspond to frequency signals with different frequencies; a controller, the controller being connected to the impedance-frequency conversion network to receive a frequency signal from the impedance-frequency conversion network to identify a frequency from the frequency signal and control an output current of an LED driver connected to the controller according to the identified frequency, wherein the impedance-frequency conversion network comprises: an optocoupler, the impedance-frequency conversion network being connected to the controller via the optocoupler and being used to isolate and transmit the frequency signal of the impedance-frequency conversion network to the controller.
[0011] In this manner, a dimmer is constructed using a resistor component with adjustable resistance. The varying resistance values of the resistor component are converted into frequency signals of varying frequencies via an impedance-frequency conversion network. This frequency signal is then isolated and transmitted to a controller via an optocoupler. The controller then identifies the frequency from the frequency signal and controls the output current of an LED driver connected to the controller based on the identified frequency, thereby enabling isolated dimming signal transmission and forming a low-cost isolated dimming solution. Therefore, the present disclosure utilizes only an optocoupler, a port of the controller, and a series-parallel configuration of a switch and resistor, or a sliding rheostat, to achieve isolated dimming of an LED driver.
[0012] According to an exemplary embodiment of the present disclosure, a resistance assembly includes at least two resistance units connected in parallel, each resistance unit including a switch and a resistor connected in series.
[0013] In this way, the resistance value of the resistance component can be adjusted by connecting the switch and the resistor in series or parallel, thereby making the circuit structure of the dimmer simple and easy to implement.
[0014] According to an exemplary embodiment of the present disclosure, the switch is a dip switch.
[0015] In this way, the user is allowed to input instructions through the dip switch to change the state of the circuit, and these instructions are then read by the dimming device and used to adjust the brightness of the light or change the dimming setting, making the dimming operation simple and easy to control.
[0016] According to an exemplary embodiment of the present disclosure, the resistance component is a sliding rheostat.
[0017] In this way, the resistance value can be adjusted by sliding the rheostat to achieve dimming, thereby providing a simple, effective and controllable dimming method that is suitable for various occasions and needs.
[0018] According to an exemplary embodiment of the present disclosure, the impedance-frequency conversion network also includes a first resistor and a first capacitor connected in series, wherein the first end of the first resistor is connected to the first end of the resistor component, and the second end of the first resistor is connected to the second end of the resistor component and the first end of the first capacitor; a second resistor and a capacitor charging and discharging network, including a second resistor and a second capacitor connected in series, wherein the second end of the second resistor is connected to the first end of the first resistor and the first end of the second capacitor, and the second end of the first capacitor is connected to the second end of the second capacitor, wherein the resistance value of the resistor component is converted into a frequency signal by the first resistor and the second resistor and the capacitor charging and discharging network.
[0019] In order to generate self-sustained oscillation to convert the resistance value into a frequency signal, two conditions need to be met: Condition 1: Amplitude amplification; Condition 2: Phase change is 180 degrees. The above conditions are met by using a first resistor-capacitor charge-discharge network and a second resistor-capacitor charge-discharge network, because only one resistor-capacitor charge-discharge network can only change the phase by 90 degrees, while by using two resistor-capacitor charging networks, a phase change of 180 degrees can be achieved, thereby meeting the above two conditions. In this way, the resistance value is converted into a frequency signal through a simple circuit structure, thereby achieving the change of the operating frequency of the dimming device by adjusting the resistance value of the dimmer, and ultimately achieving dimming of the LED.
[0020] According to an exemplary embodiment of the present disclosure, the controller includes an edge trigger connected to the optocoupler to receive a frequency signal from the optocoupler and to identify a frequency from the frequency signal.
[0021] In this way, the edge trigger is triggered only when the edge of the input signal (that is, the moment when the signal changes from low to high or from high to low) occurs. The main technical effect of this triggering method is to improve the accuracy of timing control and reduce the complexity of the circuit. In the edge triggering mode, the trigger's recognition of the input signal is strictly dependent on the jump of the signal, rather than the continuous state of the signal. This means that no matter how long the input signal lasts between two jumps, the trigger will only respond when the edge of the signal occurs, thereby ensuring the stability and predictability of the signal. In addition, the edge trigger can reduce the risk of false triggering in high-speed operation because it is only sensitive to the edge of the signal, rather than the entire cycle of the signal. Therefore, by using the edge trigger to identify the frequency, the frequency of the frequency signal can be accurately identified, thereby improving the accuracy of dimming.
[0022] According to another exemplary embodiment of the present disclosure, the impedance-frequency conversion network further includes: a diode connected in parallel with the second resistor-capacitor charge-discharge network, the anode of the diode being connected to the second end of the second capacitor, and the cathode of the diode being connected to the first end of the second resistor.
[0023] In this way, the diode can be used to provide voltage clamping for the resistor-capacitor charge-discharge network, absorb spike energy, provide a low-impedance path, and quickly respond, thereby improving circuit stability.
[0024] According to another aspect of the present disclosure, an LED driving device is provided. The LED driving device includes an LED driver and the above-mentioned dimming device, wherein the dimming device is connected to the LED driver.
[0025] (3) Technical effects
[0026] In an embodiment of the present disclosure, a dimming device and an LED driver having the dimming device are provided, wherein a dimmer is formed using a series-parallel structure of a dip switch and a resistor or a sliding resistor. Different resistance values can be converted into different frequencies through an impedance-frequency conversion network and isolated signal transmission is performed through an optical coupler, forming a low-cost isolated dimming structure, thereby solving the technical problems of high cost of using multiple optical couplers, large and complex PCB layout area, and large number of controller ports occupied. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present disclosure. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:
[0028] Figure 1 is a schematic diagram of an LED driving device according to an embodiment of the present disclosure.
[0029] Figure 2 2 is a schematic diagram of a first embodiment of a dimming device in an LED driving device according to the present disclosure.
[0030] Figure 3 2 is a schematic diagram of a second embodiment of a dimming device in an LED driving device according to the present disclosure.
[0031] Figure 4 is a schematic circuit diagram of an impedance-frequency conversion network in a dimming device according to an embodiment of the present disclosure.
[0032] Figure 5 4 is a voltage timing diagram of edge trigger sampling in a dimming device according to an embodiment of the present disclosure.
[0033] Figure 6is a schematic diagram of a dimming device according to the prior art.
[0034] Description of Figure Numbers:
[0035] 100: LED driver;
[0036] 10: dimming device;
[0037] 20: LED driver;
[0038] 101: dimmer;
[0039] 102: Impedance-frequency conversion network;
[0040] 103: controller;
[0041] 1020: first resistor-capacitor charging-discharging network;
[0042] 1021: second resistor-capacitor charging-discharging network;
[0043] 1022: Optocoupler;
[0044] 1030: Edge trigger. DETAILED DESCRIPTION
[0045] In order to enable those skilled in the art to better understand the solutions of the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present disclosure.
[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0047] As discussed in the previous background art, the inaccuracy and instability in the traditional manual installation process of the motor shaft seal ring, as well as the resulting quality problems, have not been fundamentally resolved.
[0048] To this end, the present disclosure utilizes a resistor component with adjustable resistance to form a dimmer. The resistor component's varying resistance values are converted into frequency signals of varying frequencies via an impedance-frequency conversion network. This frequency signal is then isolated and transmitted to a controller via an optocoupler. The controller then identifies the frequency signal and controls the output current of an LED driver connected to the controller based on the identified frequency, enabling isolated dimming signal transmission and creating a low-cost isolated dimming solution. Therefore, the present disclosure utilizes only an optocoupler, a port on the controller, and a series-parallel configuration of a switch and resistor, or a sliding rheostat, to achieve isolated dimming of the LED driver.
[0049] Figure 1 Schematic diagram of an LED driving device according to an embodiment of the present disclosure. Figure 1 As shown, an LED driver 100 may include an LED driver 20 and a dimming device 10 connected to a switch in the LED driver 20. The dimming device 10 ultimately dims the LED by changing the duty cycle of the on-time of the switch in the LED driver 20. Since this disclosure does not involve improvements to the LED driver 20, and those skilled in the art will be able to understand the operating principles and processes of the LED driver 20 based on the configuration of the LED driver 20 shown in this disclosure, the LED driver 20 will not be described in detail herein to avoid unnecessarily obscuring the inventive concept of this disclosure.
[0050] Specifically, if Figure 1 As shown, the dimming device 10 may include: a dimmer 101, the dimmer 101 includes a resistor component (not shown) whose resistance value can be adjusted; an impedance-frequency conversion network 102, the impedance-frequency conversion network 102 is connected to the resistor component, and is used to convert the resistance value of the dimmer 101 into a frequency signal, wherein different resistance values correspond to frequency signals with different frequencies; a controller 103, the controller 103 is connected to the impedance-frequency conversion network 102 to receive the frequency signal DIM isolated and transmitted from the impedance-frequency conversion network from the impedance-frequency conversion network as a dimming signal to identify the frequency from the frequency signal DIM and control the output current of the LED driver 20 connected to the controller 103 according to the identified frequency.
[0051] The above is an overall description of the configuration of the dimming device 10 of the present disclosure. The following will describe the various components of the dimming device 10 in detail.
[0052] [First embodiment of the dimming device]
[0053] Figure 2 FIG. 1 is a schematic diagram of a first embodiment of a dimming device in an LED driving device according to the present disclosure. Figure 2 As shown, the resistance component of the dimmer 101 may include at least two resistance units connected in parallel, and each resistance unit includes a switch and a resistor connected in series. Figure 2 As shown, resistor RP1 and switch S1 form a resistance unit, resistor RP2 and switch S2 form a resistance unit, and resistor RPN and switch SN form a resistance unit. That is, one resistor among N resistors and one switch among N switches are connected in series to form a resistance unit. Thus, dimmer 101 may include N resistance units, where N is greater than or equal to 2. In this context, switches S1-SN may all be dip switches. A user may input commands through the dip switches to change the state of the circuit. These commands are then read by the dimming device and used to adjust the brightness of the light or change the dimming setting, thereby making the dimming operation simple and easy to control, but the present disclosure is not limited to this.
[0054] In the dimmer 101 , the user can adjust the output resistance value of the resistor component of the dimmer 101 by operating the switch, thereby changing the operating frequency of the dimming device and ultimately achieving dimming of the LED, which will be described in detail below.
[0055] As an example, the impedance-frequency conversion network 102 may include a first resistor-capacitor charge-discharge network 1020, which includes a first resistor R3 and a first capacitor C3 connected in series, wherein a first end of the first resistor R3 is connected to a first end of the resistor component, and a second end of the first resistor R3 is connected to a second end of the resistor component and a first end of the first capacitor C3. Specifically, as an example, a first end of the first resistor R3 is connected to a first end of switches S1-SN of a dimmer, a second end of the switches S1-SN is connected to a first end of a respective resistor RP1-RPN, and a second end of the first resistor R3 is connected to a second end of the resistor RP1-RPN.
[0056] The impedance-frequency conversion network 102 may further include a second resistor-capacitor charge-discharge network 1021, wherein the second resistor-capacitor charge-discharge network 1021 includes a second resistor R2 and a second capacitor C2 connected in series, wherein the second end of the second resistor R2 is connected to the first end of the first resistor R3 and the first end of the second capacitor C2, and the second end of the first capacitor C3 is connected to the second end of the second capacitor C2, wherein the resistance value of the resistance component is converted into a frequency signal through the first resistor-capacitor charge-discharge network 1020 and the second resistor-capacitor charge-discharge network 1021.
[0057] In the impedance-frequency conversion network 102, in order to generate self-sustained oscillation to convert the resistance value into a frequency signal, two conditions need to be met: Condition 1: Amplitude amplification; Condition 2: Phase change is 180 degrees. The above conditions are met by using two resistor and capacitor charging and discharging networks (i.e., a first resistor and capacitor charging and discharging network and a second resistor and capacitor charging and discharging network), because only one resistor and capacitor charging and discharging network can only change the phase by 90 degrees, while by using two resistor and capacitor charging networks, a phase change of 180 degrees can be achieved, thereby satisfying the above two conditions.
[0058] As an example, the impedance-frequency conversion network 102 may further include an optical coupler 1022. The impedance-frequency conversion network 102 may be connected to the controller 103 via the optical coupler 1022 to isolate and transmit the frequency signal of the impedance-frequency conversion network 102 as a dimming signal to the controller 103. Since the optical coupler is a component well known in the art, the working principle of the optical coupler will not be described in detail here.
[0059] As an example, the impedance-frequency conversion network 102 may further include a diode DA connected in parallel with the second resistor-capacitor charge-discharge network 1021, with the anode of the diode DA connected to the second end of the second capacitor C2, and the cathode of the diode DA connected to the first end of the second resistor R2. The provision of the diode DA can provide voltage clamping for the resistor-capacitor charge-discharge network, absorb spike energy, provide a low-impedance path, and enable rapid response, thereby improving circuit stability.
[0060] As an example, the controller 103 may include an edge trigger 1030 connected to the optocoupler 1022 to receive the frequency signal from the optocoupler 1022 and to identify the frequency from the frequency signal.
[0061] Edge triggers are triggered only when an edge of the input signal occurs (i.e., the moment the signal changes from low to high or from high to low). This triggering method improves the accuracy of timing control and reduces circuit complexity. In edge triggering mode, the trigger's recognition of the input signal is strictly dependent on the signal's jump, rather than the signal's continuous state. This means that no matter how long the input signal lasts between two jumps, the trigger will only respond when the signal's edge occurs, thus ensuring signal stability and predictability. In addition, edge triggers can reduce the risk of false triggering during high-speed operation because they are only sensitive to the signal's edge, rather than the entire cycle of the signal. Therefore, by using edge triggers to identify the frequency, the frequency signal can be accurately identified, thereby improving the accuracy of dimming.
[0062] The above reference Figure 2The first embodiment of the dimming device in the LED driving device according to the present disclosure is described in detail. Figure 3 A second embodiment of a dimming device in an LED driving device according to the present disclosure is described.
[0063] [Second embodiment of the dimming device]
[0064] like Figure 3 As shown, the difference between the second embodiment of the dimming device in the LED driving device according to the present disclosure and the first embodiment of the dimming device in the LED driving device according to the present disclosure lies in the configuration of the dimmer. The following description will focus on the configuration of the dimmer, and the configuration that is the same as the first embodiment will not be repeated.
[0065] like Figure 3 As shown, in the second embodiment of the dimming device, the resistance component of the dimmer 101 is a sliding rheostat RV, and the resistance value of the sliding rheostat RV is adjusted by adjusting the length of the access portion between the sliding rheostat RV and the first resistor-capacitor charge-discharge network, thereby changing the frequency of the frequency signal output by the impedance-frequency conversion network.
[0066] The above is a description of the configuration of the dimming device of the present disclosure. Figure 4 and Figure 5 Describe the working principle and process of the dimming device.
[0067] When Figure 4 When configuring the parameters of each electronic device, the second resistor-capacitor charge-discharge network 1021 (R2 / C2) and the first resistor-capacitor charge-discharge network 1020 (R3 / C3) form a two-stage RC charge-discharge network, and the reference pin (point C) of the diode DA is 2.495V. When the voltage at point C is lower than 2.495V, the diode DA is not conducting, points A and B are both in the charging state, the NPN transistor Q1 and the optocoupler 1022 are both in the working state, and therefore point D is a low level. When the voltage at point C is higher than 2.495V, the diode DA is in the conducting state, points A and B are both in the discharging state, the NPN transistor Q1 and the optocoupler 1022 stop working, and therefore point D is a high level. Thus, the operating frequency of point D is formed, and the edge trigger of the controller 103 knows that the time coefficient of the two-stage RC charge-discharge network has changed by detecting the frequency.
[0068] Therefore, by changing the time coefficient of the two-stage RC charging and discharging network, for example, by adjusting the resistance value of the resistance component of the dimmer connected in parallel with the first resistor R3 so that the equivalent resistance value of the RC network formed in series with the first capacitor C3 is changed from 20KΩ to 10KΩ, the frequency at point D can be changed from 880 Hz to 1230 Hz.
[0069] In addition, Figure 4 In the circuit, capacitor C1 is used to filter out the spike wave of the signal, diode D1 is used to realize the discharge of the RC charge and discharge network, and resistors R4 and R5 are used to limit the current of the optocoupler to provide its operating current to the optocoupler. Resistor R1 is used to limit the current of the RC charge and discharge network to protect the components of the RC charge and discharge network.
[0070] Further, if Figure 5 As shown, by changing the time coefficient of the two-stage RC charging and discharging network, the edge trigger of the controller can detect the edges of different cycles of the frequency signal, thereby being able to identify the frequency of the received frequency signal.
[0071] As an example, assume that the dimmer is designed to have four states, as shown in Table 1, namely Figure 2 The dimmer in FIG has two resistor units: one consisting of resistor RP1 and switch S1, and another consisting of resistor RP2 and switch S2. Therefore, the different states of the dimmer's switches correspond to four different values of the time constant of the second RC stage, generating four specific frequencies at point D. By determining which of these four frequency points D is being operated, the controller can determine the state of the switches and, therefore, which of the four current ranges the LED driver's output current should be set to.
[0072] Table 1
[0073] state S1 S2 First RC time constant 1 disconnect disconnect R3*C3 2 disconnect closure (R3 / / RP2)*C3 3 closure disconnect (R3 / / RP1)*C3 4 closure closure (R3 / / RP1 / / RP2)*C3
[0074] The present invention only uses an optocoupler, a port of a controller, and a series-parallel structure of a switch and a resistor or a sliding rheostat to achieve isolated dimming of an LED driver. Compared with existing methods, it has lower costs, smaller PCB layout area, and reduces the occupation of the controller port.
[0075] In the above embodiments of the present disclosure, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0076] In the several embodiments provided in this disclosure, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are merely illustrative. The above are only preferred implementations of the present disclosure. It should be noted that for those skilled in the art, various improvements and modifications can be made without departing from the principles of the present disclosure, and such improvements and modifications should also be considered as the scope of protection of the present disclosure.
Claims
1. A dimming device, characterized in that: The dimming device comprises: A dimmer (101), the dimmer (101) comprising a resistor component whose resistance value can be adjusted; an impedance-frequency conversion network (102), the impedance-frequency conversion network (102) being connected to the resistance component and configured to convert the resistance value of the dimmer (101) into a frequency signal, wherein different resistance values correspond to frequency signals having different frequencies; a controller (103) connected to the impedance-frequency conversion network (102) to receive the frequency signal from the impedance-frequency conversion network (102) to identify the frequency from the frequency signal and control the output current of the LED driver (20) connected to the controller (103) according to the identified frequency, Wherein, the impedance-frequency conversion network (102) comprises: An optical coupler (1022), wherein the impedance-frequency conversion network (102) is connected to the controller (103) via the optical coupler (1022), and is used for isolating and transmitting the frequency signal of the impedance-frequency conversion network (102) to the controller (103).
2. The dimming device according to claim 1, wherein: The resistance component includes: at least two resistance units connected in parallel, and each resistance unit includes a switch and a resistor connected in series.
3. The dimming device according to claim 2, wherein: The switch is a dip switch.
4. The dimming device according to claim 1, wherein: The resistance component is a sliding resistor (RS).
5. The dimming device according to claim 1, wherein: The impedance-frequency conversion network (102) further includes: A first resistor-capacitor charge-discharge network (1020) comprises a first resistor (R3) and a first capacitor (C3) connected in series, wherein a first end of the first resistor (R3) is connected to a first end of the resistor component, and a second end of the first resistor (R3) is connected to a second end of the resistor component and a first end of the first capacitor (C3). a second resistor-capacitor charge-discharge network (1021), comprising a second resistor (R2) and a second capacitor (C2) connected in series, wherein a second end of the second resistor (R2) is connected to a first end of the first resistor (R3) and a first end of the second capacitor (C2), and a second end of the first capacitor (C3) is connected to a second end of the second capacitor (C2), The resistance value of the resistor component is converted into the frequency signal through the first resistor-capacitor charge-discharge network (1020) and the second resistor-capacitor charge-discharge network (1021).
6. The dimming device according to claim 1, wherein: The controller (103) includes an edge trigger (1030) connected to the optical coupler (1022) to receive the frequency signal from the optical coupler (1022) and to identify the frequency from the frequency signal.
7. The dimming device according to claim 5, characterized in that: The impedance-frequency conversion network (102) further comprises: a diode (DA) connected in parallel with the second resistor-capacitor charge-discharge network (1021), wherein the cathode of the diode (DA) is connected to the first end of the second resistor (R2) and the anode of the diode (DA) is connected to the second end of the second capacitor (C2).
8. An LED driving device, characterized in that: The LED driving device includes an LED driver and a dimming device according to any one of claims 1 to 7, wherein the dimming device is connected to the LED driver.