LED driver

Abstract

An output end of a dimming type selection circuit is connected with a control end of a dimming instruction receiving circuit, an input end of the dimming instruction receiving circuit is a dimming instruction receiving end, an output end of the dimming instruction receiving circuit is connected with a control end of a dimming control circuit, an input end of the dimming control circuit is connected with an alternating current power supply, and an output end of the dimming control circuit is connected with an LED. The dimming instruction receiving circuit comprises at least two dimming instruction channels with different dimming types, and the dimming type selection circuit controls the corresponding dimming instruction channel to be conducted according to a dimming type selection instruction. The switched-on dimming instruction path converts a dimming instruction received by the dimming instruction receiving end into a dimming voltage signal and then sends the dimming voltage signal to the dimming control circuit, and the dimming control circuit adjusts output current after power conversion and constant current control of an alternating current power supply based on the dimming voltage signal, namely, dimming control is carried out on an LED. Therefore, the purpose that one LED driver adjusts various dimming types of the LED is achieved.

Description

Technical Field

[0001] This utility model relates to the field of LED control, and in particular to an LED driver. Background Technology

[0002] In the field of LED (light-emitting diode) lighting control, the demand for LED brightness control is increasing, which means the demand for LED dimming is also increasing. However, the circuits for LED dimming design are relatively complex, increasing the complexity of the entire LED driver. For dimmable drivers with a single dimming type, although their circuits are much simpler, the number of dimming types available is limited, which greatly restricts the user experience. Furthermore, when users need LED drivers with different dimming types, different drivers must be designed for each type, inevitably leading to an increase in the variety of driver products and the complexity of inventory management.

[0003] Therefore, designing an LED driver that can adapt to various dimming types and has a simple structure is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide an LED driver in which the output terminal of a dimming type selection circuit is connected to the control terminal of a dimming command receiving circuit. The input terminal of the dimming command receiving circuit is a dimming command receiving terminal, and its output terminal is connected to the control terminal of a dimming control circuit. The input terminal of the dimming control circuit is connected to an AC power supply, and its output terminal is connected to the LED. The dimming command receiving circuit includes at least two dimming command paths with different dimming types. The dimming type selection circuit controls the corresponding dimming command path to be turned on according to the dimming type selection command, so that the turned-on dimming command path converts the dimming command received by the dimming command receiving terminal into a dimming voltage signal and sends it to the dimming control circuit. The dimming control circuit adjusts the output current of the AC power supply after power conversion and constant current control based on the dimming voltage signal, that is, it performs dimming control on the LED, so as to realize that one LED driver can adjust the LED to multiple dimming types.

[0005] To solve the above-mentioned technical problems, this utility model provides an LED driver, including a dimming type selection circuit, a dimming command receiving circuit, and a dimming control circuit;

[0006] The output terminal of the dimming type selection circuit is connected to the control terminal of the dimming command receiving circuit. The input terminal of the dimming command receiving circuit is the dimming command receiving terminal, and the output terminal is connected to the control terminal of the dimming control circuit. The input terminal of the dimming control circuit is connected to an AC power supply, and the output terminal is connected to the LED. The dimming command receiving circuit includes at least two dimming command paths, and each dimming command path has a different dimming type.

[0007] The dimming type selection circuit is used to control the dimming command path corresponding to the dimming type selection command in the dimming command receiving circuit to be turned on based on the received dimming type selection command; the dimming command path turned on in the dimming command receiving circuit is used to convert the dimming command received through the dimming command receiving terminal into a dimming voltage signal and send it to the dimming control circuit, so that the dimming control circuit adjusts the output current of the AC power supply after power conversion and constant current control based on the dimming voltage signal, that is, to dim the LED.

[0008] Preferably, the dimming type selection circuit includes a dimming type selection module and a dimming type control module;

[0009] The output terminal of the dimming type selection module is connected to the input terminal of the dimming type control module, and the output terminal of the dimming type control module is connected to the control terminal of the dimming command receiving circuit.

[0010] The dimming type selection module is used to transmit the received dimming type selection instruction to the dimming type control module, so that the dimming type control module controls the dimming instruction path corresponding to the dimming type selection instruction in the dimming instruction receiving circuit to be turned on based on the dimming type selection instruction.

[0011] Preferably, the dimming type selection module includes a wireless signal receiver for converting the received wireless signal into the dimming type selection instruction and transmitting it to the dimming type control module.

[0012] Preferably, the wireless signal receiver is an NFC receiver, and the wireless signal is an NFC signal.

[0013] Preferably, the dimming type selection module includes a DIP switch, wherein each position of the DIP switch corresponds one-to-one with a dimming command path in the dimming command receiving circuit, and is used to generate a dimming type selection command based on the selected position and transmit it to the dimming type control module.

[0014] Preferably, the dimming command receiving circuit includes a switching module and a dimming signal module;

[0015] The control terminal of the switch module is connected to the output terminal of the dimming type selection circuit. The first terminal of the switch module is the dimming command receiving terminal. The second terminal of the switch module is connected to the input terminal of the dimming signal module. The output terminal of the dimming signal module is connected to the control terminal of the dimming control circuit. The switch module includes at least two switch paths, and the dimming signal module includes at least two dimming sub-modules. Each dimming sub-module corresponds one-to-one with each switch path, and each switch path and its corresponding dimming sub-module constitute a dimming command path.

[0016] The switching path in the switching module is used to send the received dimming command to the corresponding dimming submodule, so that the dimming submodule converts the dimming command into a dimming voltage signal and sends it to the dimming control circuit.

[0017] Preferably, the first positive terminal of each of the switch paths is short-circuited, the first negative terminal of each of the switch paths is short-circuited, and the first positive terminal and the first negative terminal of each of the switch paths are the dimming command receiving terminals; the second positive terminal of each of the switch paths is connected to the first input terminal of the corresponding dimming submodule, and the second negative terminal of each of the switch paths is connected to the second input terminal of the corresponding dimming submodule; each of the switch paths includes a first switch, the first terminal of the first switch is the first positive terminal or the first negative terminal of the switch path, the second terminal of the first switch is the second positive terminal or the second negative terminal of the switch path, and the control terminal of each first switch is the control terminal of each of the switch paths.

[0018] Preferably, the dimming control circuit includes a power conversion circuit and a dimming feedback circuit;

[0019] The input terminal of the power conversion circuit is connected to the AC power supply, the feedback terminal is connected to the output terminal of the dimming feedback circuit, and the output terminal is connected to the LED; the first input terminal of the dimming feedback circuit is connected to the output terminal of the dimming command receiving circuit, and the second input terminal is connected to the output terminal of the power conversion circuit.

[0020] The dimming feedback circuit is used to generate a feedback voltage signal based on the output current of the power conversion circuit and the dimming voltage signal; the power conversion circuit is used to adjust the output current of the AC power supply after power conversion and constant current control based on the feedback voltage signal, that is, to dim the LED.

[0021] Preferably, the dimming feedback circuit includes a first operational amplifier, a first voltage sampling resistor, a first filter resistor, a first filter capacitor, a first current-limiting resistor, and a second current-limiting resistor;

[0022] The first end of the first voltage sampling resistor is connected to the output terminal of the power conversion circuit, and the second end is connected to the negative input terminal of the first operational amplifier; the first end of the first filter resistor is connected to the second end of the first voltage sampling resistor, and the second end is connected to the first end of the first filter capacitor; the second end of the first filter capacitor is connected to the output terminal of the first operational amplifier; the first end of the first current limiting resistor is connected to the output terminal of the dimming command receiving circuit, and the second end is connected to the positive input terminal of the first operational amplifier; the first end of the second current limiting resistor is connected to the positive input terminal of the first operational amplifier, and the second end is connected to a first reference voltage; the output terminal of the first operational amplifier is the output terminal of the dimming feedback circuit.

[0023] Preferably, the dimming feedback circuit includes a second operational amplifier, a second voltage sampling resistor, a second filter resistor, a second filter capacitor, and a third current limiting resistor;

[0024] The first end of the second voltage sampling resistor is connected to the output terminal of the power conversion circuit, and the second end is connected to the negative input terminal of the second operational amplifier; the first end of the second filter resistor is connected to the second end of the second voltage sampling resistor, and the second end is connected to the first end of the second filter capacitor; the second end of the second filter capacitor is connected to the output terminal of the second operational amplifier; the first end of the third current limiting resistor is connected to the output terminal of the dimming command receiving circuit, and the second end is connected to the negative input terminal of the second operational amplifier; the positive input terminal of the second operational amplifier is connected to the second reference voltage, and the output terminal is the output terminal of the dimming feedback circuit.

[0025] This application provides an LED driver. The output terminal of a dimming type selection circuit is connected to the control terminal of a dimming command receiving circuit. The input terminal of the dimming command receiving circuit is a dimming command receiving terminal, and its output terminal is connected to the control terminal of a dimming control circuit. The input terminal of the dimming control circuit is connected to an AC power supply, and its output terminal is connected to the LED. The dimming command receiving circuit includes at least two dimming command paths with different dimming types. The dimming type selection circuit controls the corresponding dimming command path to be turned on according to the dimming type selection command, so that the turned-on dimming command path converts the dimming command received by the dimming command receiving terminal into a dimming voltage signal and sends it to the dimming control circuit. The dimming control circuit adjusts the output current of the AC power supply after power conversion and constant current control based on the dimming voltage signal, that is, it performs dimming control on the LED, so as to realize the adjustment of multiple dimming types of the LED through one LED driver. Attached Figure Description

[0026] To more clearly illustrate the embodiments of this utility model, the drawings used in the embodiments 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 these drawings without creative effort.

[0027] Figure 1 This application provides a schematic diagram of the structure of an LED driver;

[0028] Figure 2 This application provides a schematic diagram of the specific structure of an LED driver;

[0029] Figure 3 A schematic diagram of a dimming command receiving circuit provided in this application;

[0030] Figure 4 A schematic diagram of the structure of the first dimming control circuit provided in this application;

[0031] Figure 5 This is a schematic diagram of the structure of the second dimming control circuit provided in this application. Detailed Implementation

[0032] The core of this invention is to provide an LED driver. The output terminal of a dimming type selection circuit is connected to the control terminal of a dimming command receiving circuit. The input terminal of the dimming command receiving circuit is a dimming command receiving terminal, and its output terminal is connected to the control terminal of a dimming control circuit. The input terminal of the dimming control circuit is connected to an AC power supply, and its output terminal is connected to the LED. The dimming command receiving circuit includes at least two dimming command paths with different dimming types. The dimming type selection circuit controls the corresponding dimming command path to be turned on according to the dimming type selection command, so that the turned-on dimming command path converts the dimming command received by the dimming command receiving terminal into a dimming voltage signal and sends it to the dimming control circuit. The dimming control circuit adjusts the output current after power conversion and constant current control of the AC power supply based on the dimming voltage signal, that is, it performs dimming control on the LED, so as to realize that one LED driver can adjust the LED to multiple dimming types.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, 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.

[0034] Please refer to Figure 1 , Figure 1 The present application provides a schematic diagram of the structure of an LED driver, which includes a dimming type selection circuit 1, a dimming command receiving circuit 2, and a dimming control circuit 3.

[0035] The output of the dimming type selection circuit 1 is connected to the control terminal of the dimming command receiving circuit 2. The input of the dimming command receiving circuit 2 is the dimming command receiving terminal, and the output is connected to the control terminal of the dimming control circuit 3. The input of the dimming control circuit 3 is connected to an AC power supply, and the output is connected to the LED. The dimming command receiving circuit 2 includes at least two dimming command paths, and each dimming command path has a different dimming type.

[0036] The dimming type selection circuit 1 is used to control the dimming command path corresponding to the dimming type selection command in the dimming command receiving circuit 2 to be turned on based on the received dimming type selection command. The dimming command path turned on in the dimming command receiving circuit 2 is used to convert the dimming command received through the dimming command receiving terminal into a dimming voltage signal and send it to the dimming control circuit 3, so that the dimming control circuit 3 can adjust the output current after the AC power supply is converted and constant current controlled based on the dimming voltage signal, that is, to dim the LED.

[0037] LEDs can efficiently convert electrical energy into light energy and are a commonly used light-emitting device. Dimming of LEDs can be achieved by adjusting the current supplied to them. In existing technologies, LED dimming can be categorized into various types depending on the application scenario. Different applications require different dimming types, such as DMX (Digital Multiplex) dimming, DALI (Digital Addressable Lighting Interface) dimming, PWM (Pulse Width Modulation) dimming, and 0-10V linear dimming. DMX is a digital communication protocol that transmits data via the RS-485 serial communication standard. When dimming via DMX, each DMX device, i.e., each controlled LED, has a unique address. To control the dimming of individual LEDs, dimming commands containing information such as brightness and color can be sent. The DMX signal can include 512 channels, thereby controlling up to 512 LEDs. Each channel can independently control one LED, enabling individual dimming of different LEDs. It is mainly used in stage lighting, studio lighting, theme parks, and other venues that require complex lighting effects, i.e., it is suitable for scenarios that require precise control of multiple lighting devices. DALI is also a digital communication protocol primarily used for intelligent lighting control. When dimming via DALI, each controlled LED has a unique address. To control the dimming of individual LEDs, data packets containing information such as brightness and color are sent. Furthermore, DALI supports bidirectional communication; each LED can use DALI to report status information to higher-level devices, such as fault alarms and energy consumption data. It is mainly used in commercial buildings, office buildings, hotels, and other locations requiring intelligent lighting control—suitable for scenarios requiring flexible control and management. In PWM dimming, PWM is a technology that controls the signal duty cycle by changing the pulse width. To control the dimming of individual LEDs, PWM signals with different duty cycles are sent to control the light brightness. The higher the duty cycle of the PWM signal, the brighter the light. It is mainly used in scenarios requiring efficient control and energy saving. 0-10V linear dimming is a type of LED dimming that uses analog signal control. It controls the brightness of the light by changing the voltage value (from 0V to 10V). The higher the voltage value, the brighter the light. It is mainly used in traditional lighting systems, such as fluorescent lamps and halogen lamps, where simple dimming control is required.

[0038] Existing LED drivers typically only have one dimming type. If you want to change the dimming type of an LED, you need to redesign or select a corresponding LED driver, which will inevitably increase the application cost of the LED driver. For manufacturers, this means that they need to design multiple different LED drivers and increase the complexity of inventory preparation.

[0039] In the design of the LED driver in this application, the LED driver includes a dimming type selection circuit 1, a dimming command receiving circuit 2, and a dimming control circuit 3. The dimming command receiving circuit 2 includes at least two dimming command paths, each with a different dimming type. Based on this, the LED driver can control the dimming of the LED through various dimming types, improving the compatibility of the LED driver. Specifically, the output terminal of the dimming type selection circuit 1 is connected to the control terminal of the dimming command receiving circuit 2. The dimming type selection circuit 1 controls the corresponding dimming command path in the dimming command receiving circuit 2 to be turned on according to the dimming type in the received dimming type selection command. The turned-on dimming command path can receive the dimming command corresponding to its own dimming type, convert the dimming command into a dimming voltage signal, and transmit it to the dimming control circuit 3. Depending on the different dimming commands, the converted dimming voltage signal is also different, thus causing the output DC current after the dimming control signal converts the AC power output to different values, thereby achieving LED dimming.

[0040] For example, the dimming command receiving circuit 2 includes a DMX dimming command path, a DALI dimming command path, a PWM dimming command path, and a 0-10V linear dimming command path. The dimming type selection command is the DMX dimming command path. Then, the dimming type selection circuit 1 controls the control terminal of the DMX dimming command path through its own output terminal to make the DMX dimming command path conduct. The input terminal of the DMX dimming command path is the dimming command receiving terminal, which receives the dimming command and converts it into a dimming voltage signal. It then transmits the signal to the control terminal of the dimming control circuit 3 through its own output terminal. If the dimming command is to increase the brightness of the LED, then after the dimming voltage signal is transmitted to the dimming control circuit 3, when the AC power output is converted according to the dimming voltage signal, the constant current power supply to the LED is ensured while the DC current output is increased to increase the brightness of the LED. Of course, dimming commands can also adjust the color of LEDs. For example, dimming control circuit 3 can increase the DC current input to the target color LED based on the dimming voltage signal to increase the brightness of the target color LED, and decrease the current input to non-target color LEDs to decrease the brightness of the target color LED, thus achieving LED color conversion. This application does not limit this. Of course, after adjusting the output current of the AC power supply based on the dimming voltage signal, regardless of whether the DC current supplying the LED increases or decreases, the DC current supplying the LED remains constant until the next dimming voltage signal is received, so as to keep the LED brightness stable.

[0041] It should be noted that dimming commands and dimming type selection commands are corresponding; that is, the signal format of a dimming command corresponds to the dimming type of the dimming type selection command. For example, if the dimming type selection command is a DMX dimming command path, then the dimming command is a DMX protocol signal.

[0042] Furthermore, the dimming command receiving circuit 2 in this application may also include a custom time dimming command path and / or a custom protocol dimming command path. If the dimming type selection command is a custom time dimming command path, then the dimming command is to increase the brightness of the LED during a certain time period and decrease the brightness of the LED during another time period. That is, the dimming command can control the brightness of the LED in different time periods. If the dimming type selection command is a custom protocol dimming command path, then the dimming command is a signal corresponding to the custom protocol. Users can set the custom protocol according to their own needs and control the corresponding dimming command path to be turned on, and dim the LED through the dimming command corresponding to the custom protocol.

[0043] It should be noted that manufacturers can control the corresponding dimming command path for users before delivery according to the dimming type required by the user's application scenario, and change the dimming command path for users when they want to change the dimming type later. This application does not limit this.

[0044] The dimming type selection circuit 1 and the dimming command receiving circuit 2 can be implemented by a microcontroller or a chip, and this application does not limit them.

[0045] In summary, the output of the dimming type selection circuit 1 is connected to the control terminal of the dimming command receiving circuit 2. The input of the dimming command receiving circuit 2 is the dimming command receiving terminal, and its output is connected to the control terminal of the dimming control circuit 3. The input of the dimming control circuit 3 is connected to the AC power supply, and its output is connected to the LED. The dimming command receiving circuit 2 includes at least two dimming command paths with different dimming types. The dimming type selection circuit 1 controls the corresponding dimming command path to be turned on according to the dimming type selection command, so that the turned-on dimming command path converts the dimming command received by the dimming command receiving terminal into a dimming voltage signal and sends it to the dimming control circuit 3. The dimming control circuit 3 adjusts the output current of the AC power supply after power conversion and constant current control based on the dimming voltage signal, that is, it performs dimming control on the LED, so as to realize that one LED driver can adjust the LED to multiple dimming types.

[0046] Based on the above embodiments:

[0047] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the specific structure of an LED driver provided in this application.

[0048] In a preferred embodiment, the dimming type selection circuit 1 includes a dimming type selection module 11 and a dimming type control module 12;

[0049] The output terminal of the dimming type selection module 11 is connected to the input terminal of the dimming type control module 12, and the output terminal of the dimming type control module 12 is connected to the control terminal of the dimming command receiving circuit 2.

[0050] The dimming type selection module 11 is used to transmit the received dimming type selection instruction to the dimming type control module 12, so that the dimming type control module 12 controls the dimming instruction path corresponding to the dimming type selection instruction in the dimming instruction receiving circuit 2 to be turned on based on the dimming type selection instruction.

[0051] In this embodiment, the dimming type selection circuit 1 includes a dimming type selection module 11 and a dimming type control module 12. The dimming type selection module 11 is a module that receives dimming type selection instructions, while the dimming type control module 12 is a module that controls the dimming instruction path in the dimming instruction receiving circuit 2 according to the dimming type selection module 11. Through the above-described functional distribution, the resource occupation of the dimming type selection module 11 and the dimming type control module 12 is reduced, and the control efficiency of the dimming instruction path is improved.

[0052] In a preferred embodiment, the dimming type selection module 11 includes a wireless signal receiver for converting the received wireless signal into a dimming type selection command and transmitting it to the dimming type control module 12.

[0053] In this embodiment, the dimming type selection module 11, which is responsible for receiving the dimming type selection command, can be a wireless signal receiver. That is, the dimming type selection module 11 can receive wireless signals and convert them into dimming type selection commands. The wireless signal receiver can be implemented through a Bluetooth module and / or a Wi-Fi (Wireless Fidelity) module. In other words, the user can send wireless signals on the terminal via Bluetooth or Wi-Fi. Even if the user is far away from the LED driver, the dimming type selection command can still be wirelessly transmitted, improving the flexibility of dimming command path selection.

[0054] In a preferred embodiment, the wireless signal receiver is an NFC receiver, and the wireless signal is an NFC signal.

[0055] The wireless signal receiver can also be an NFC (Near Field Communication) receiver. Users can send NFC signals through the NFC generator, and the NFC receiver will then convert the NFC signals into dimming type selection instructions and send them to the dimming type control module 12. The NFC signal has a fast transmission speed, usually reaching 424 kbps, which can transmit a small amount of data in a short time. Since the communication distance between the NFC receiver and the NFC generator is usually very short, generally only a few centimeters, it makes the interaction more difficult to be illegally obtained or stolen, ensuring the security of data transmission.

[0056] After receiving the radio frequency signal (NFC signal) emitted by the NFC generator, the NFC receiver converts the NFC signal into a digital signal through its internal circuitry and then decodes and processes it. Specifically, the NFC receiver can convert the received radio frequency signal into an electrical signal, and then convert it into a digital signal (dimotherm selection command) through an analog-to-digital converter. This command is then transmitted to the dimming type control module 12, which controls the corresponding dimming command path to be activated based on the dimming type selection command.

[0057] In a preferred embodiment, the dimming type selection module 11 includes a DIP switch, the positions of which correspond one-to-one with the dimming command paths in the dimming command receiving circuit 2. The DIP switch is used to generate a dimming type selection command based on the selected position and transmit it to the dimming type control module 12.

[0058] The dimming type selection module 11 in this embodiment may include a DIP switch. The number of dimming command paths in the dimming command receiving circuit 2 corresponds to the number of positions on the DIP switch. The number of positions on the DIP switch is the same as and corresponds one-to-one with the number of dimming command paths in the dimming command receiving circuit 2. For example, if the dimming command receiving circuit 2 includes a DMX dimming command path, a DALI dimming command path, a PWM dimming command path, and a 0-10V linear dimming command path, then the positions on the DIP switch are DMX dimming positions, DALI dimming positions, PWM dimming positions, and 0-10V linear dimming positions, respectively. The user can select different positions to send different dimming type commands. Specifically, if the user presses the DMX dimming position, the DIP switch will convert the corresponding position signal into a dimming type selection command for the DMX dimming type path and transmit it to the dimming type control module 12.

[0059] The DIP switch is simple to set up and easy to operate, and is not easily affected by interference, ensuring the accuracy of control over the dimming command path.

[0060] In a preferred embodiment, the dimming command receiving circuit 2 includes a switching module 21 and a dimming signal module 22;

[0061] The control terminal of the switch module 21 is connected to the output terminal of the dimming type selection circuit 1. The first terminal of the switch module 21 is the dimming command receiving terminal. The second terminal of the switch module 21 is connected to the input terminal of the dimming signal module 22. The output terminal of the dimming signal module 22 is connected to the control terminal of the dimming control circuit 3. The switch module 21 includes at least two switch paths. The dimming signal module 22 includes at least two dimming sub-modules. Each dimming sub-module corresponds to each switch path. Each switch path and its corresponding dimming sub-module constitute a dimming command path.

[0062] The switching path in the switching module 21 is used to send the received dimming command to the corresponding dimming submodule, so that the dimming submodule converts the dimming command into a dimming voltage signal and sends it to the dimming control circuit 3.

[0063] In this embodiment, the dimming command receiving circuit 2 includes a switch module 21 and a dimming signal module. The switch module 21 includes multiple switch paths, and the dimming signal module includes multiple dimming sub-modules. Each switch path corresponds to a dimming sub-module. After receiving the dimming type selection command, the dimming type selection circuit 1 turns on the switch path corresponding to the dimming type according to the dimming type selection command. Then, the corresponding dimming sub-module can receive the dimming command through the turned-on switch path and convert the dimming command into a dimming voltage signal. For example, the switch module 21 includes a DMX dimming switch path, a DALI dimming switch path, a PWM dimming switch path, and a 0-10V linear dimming switch path. The dimming signal module includes a DMX dimming sub-module, a DALI dimming sub-module, a PWM dimming sub-module, and a 0-10V linear dimming sub-module. The DMX dimming switch path is connected to the DMX dimming sub-module, the DALI dimming switch path is connected to the DALI dimming sub-module, the PWM dimming switch path is connected to the PWM dimming sub-module, and the 0-10V linear dimming switch path is connected to the 0-10V linear dimming sub-module. The dimming type selection circuit 1 turns on the DMX dimming switch path according to the dimming type selection command. Then, the DMX dimming sub-module can receive the dimming command under the DMX protocol through the first end of the DMX dimming switch path and convert it into a dimming voltage signal.

[0064] Figure 2 Dim in the diagram represents the dimming command receiver.

[0065] It should be noted that the dimming voltage signal in this application can be a digital signal or an analog signal, and the corresponding dimming control circuit 3 is either a digital signal processing circuit or an analog signal processing circuit. This application does not limit this.

[0066] In a preferred embodiment, the first positive terminal of each switch path is short-circuited, the first negative terminal of each switch path is short-circuited, and the first positive terminal and the first negative terminal of each switch path are dimming command receiving terminals; the second positive terminal of each switch path is connected to the first input terminal of the corresponding dimming submodule, and the second negative terminal of each switch path is connected to the second input terminal of the corresponding dimming submodule; each switch path includes a first switch, the first terminal of the first switch is the first positive terminal or the first negative terminal of the switch path, the second terminal of the first switch is the second positive terminal or the second negative terminal of the switch path, and the control terminal of each first switch is the control terminal of each switch path.

[0067] Please refer to Figure 3 , Figure 3 This is a schematic diagram of a dimming command receiving circuit provided in this application.

[0068] In this embodiment, the dimming command receiving end is divided into a positive dimming command receiving end Dim+ and a negative dimming command receiving end Dim-. The positive dimming command receiving end Dim+ is the end after the first positive terminal of each switch path is shorted, and the negative dimming command receiving end Dim- is the end after the first negative terminal of each switch path is shorted. That is, each switch path and the corresponding dimming submodule are connected in series to form a dimming command path, and the dimming command paths are connected in parallel. Each switch path includes a first switch, which can be set between the first positive terminal and the second positive terminal of the switch path, or between the first negative terminal and the second negative terminal of the switch path. The control terminal of the first switch is the control terminal of the switch path. The dimming type selection circuit 1 turns on the first switch in the corresponding switch path according to the dimming type selection command to realize the conduction of the corresponding dimming command path.

[0069] Of course, a first switch can be set between the first positive terminal and the second positive terminal of the switching path, and a second switch can be set between the first negative terminal and the second negative terminal of the switching path. The control terminals of the first switch and the second switch are both control terminals of the switching path. The dimming type selection circuit 1 simultaneously turns on the first switch and the second switch in the corresponding switching path according to the dimming type selection command, so as to realize the conduction of the corresponding dimming command path. Specifically, a first switch and a second switch can be set simultaneously in the DALI dimming switch path to realize dual-control switch control. Figure 3 As shown, Figure 3 The switching module 21 includes a 512A dimming switch path, namely a DMX dimming switch path, a 0-10V linear dimming switch path, and a DALI dimming switch path. The 512A dimming switch path includes a first switch connected to a first dimming submodule. When the 512A dimming switch path is on, the first dimming submodule outputs a first dimming voltage signal Vd1. The 0-10V linear dimming switch path includes a first switch connected to a second dimming submodule, enabling 0-10V linear dimming. When the switching path is on, the second dimming submodule outputs the second dimming voltage signal Vd2; the DALI dimming switch path includes a first switch and is connected to the third dimming submodule. When the DALI dimming switch path is on, the third dimming submodule outputs the third dimming voltage signal Vd3; and regardless of whether the 512A dimming switch path is on, the 0-10V linear dimming switch path is on, or the DALI dimming switch path is on, the dimming voltage signal received at the input terminal of the dimming control circuit 3 is Vd.

[0070] In addition, it should be noted that only one switch path is active at any given time.

[0071] In a preferred embodiment, the dimming control circuit 3 includes a power conversion circuit 31 and a dimming feedback circuit 32;

[0072] The input terminal of the power conversion circuit 31 is connected to an AC power source, the feedback terminal is connected to the output terminal of the dimming feedback circuit 32, and the output terminal is connected to the LED; the first input terminal of the dimming feedback circuit 32 is connected to the output terminal of the dimming command receiving circuit 2, and the second input terminal is connected to the output terminal of the power conversion circuit 31.

[0073] The dimming feedback circuit 32 is used to generate a feedback voltage signal based on the output current of the power conversion circuit 31 and the dimming voltage signal; the power conversion circuit 31 is used to adjust the output current of the AC power supply after power conversion and constant current control based on the feedback voltage signal, that is, to dim the LED.

[0074] In this embodiment, the dimming control circuit 3 includes a power conversion circuit 31 and a dimming feedback circuit 32. The power conversion circuit 31 converts AC power to DC power to supply the LED. The dimming feedback circuit 32 adjusts the AC power input to the power conversion circuit 31 based on the DC power output from the power conversion circuit 31 and the dimming voltage signal, thereby adjusting the magnitude of the DC power output from the power conversion circuit 31 and thus achieving LED dimming control. Specifically, the dimming feedback circuit 32 superimposes the output current of the power conversion circuit 31, the dimming voltage signal, and the reference voltage in different forms and compares them accordingly. Based on the relationship between the output current of the power conversion circuit 31, the reference voltage, and the dimming voltage signal, it adjusts the feedback voltage signal, thereby adjusting the DC current output by the power conversion circuit 31. Figure 2 AC in this context refers to alternating current power.

[0075] It should be noted that, regardless of the dimming type, when a dimming command is received, the power conversion circuit 31 will adjust the output current to increase or decrease the brightness of the LED. After the adjustment is completed, the output current of the power conversion circuit 31 remains unchanged until the next dimming command is received. That is, the power conversion circuit 31 outputs a constant current to power the LED.

[0076] In a preferred embodiment, the dimming feedback circuit 32 includes a first operational amplifier OP1, a first voltage sampling resistor R11, a first filter resistor R21, a first filter capacitor C21, a first current limiting resistor R31, and a second current limiting resistor R32.

[0077] The first end of the first voltage sampling resistor R11 is connected to the output of the power conversion circuit 31, and the second end is connected to the negative input of the first operational amplifier OP1; the first end of the first filter resistor R21 is connected to the second end of the first voltage sampling resistor R11, and the second end is connected to the first end of the first filter capacitor C21; the second end of the first filter capacitor C21 is connected to the output of the first operational amplifier OP1; the first end of the first current limiting resistor R31 is connected to the output of the dimming command receiving circuit 2, and the second end is connected to the positive input of the first operational amplifier OP1; the first end of the second current limiting resistor R32 is connected to the positive input of the first operational amplifier OP1, and the second end is connected to the first reference voltage Vref1; the output of the first operational amplifier OP1 is the output of the dimming feedback circuit 32.

[0078] In this embodiment, the first voltage sampling resistor R11 is connected to the output terminal of the power conversion circuit 31, enabling it to collect the output current of the power conversion circuit 31 and convert it into a sampling voltage, which is then transmitted to the negative input terminal of the first operational amplifier OP1. The output terminal of the dimming command receiving circuit 2 is connected to the positive input terminal of the first operational amplifier OP1 via the first current-limiting resistor R31. Simultaneously, the positive input terminal of the first operational amplifier OP1 is also connected to the first reference voltage Vref1 via the second current-limiting resistor R32. This allows the dimming voltage signal and the first reference voltage Vref1 to be superimposed through the first and second current-limiting resistors R31 and transmitted to the positive input terminal of the first operational amplifier OP1, thus achieving dimming signal reception. The photovoltage signal and the first reference voltage Vref1 are superimposed and compared with the sampled voltage converted from the output current of the power conversion circuit 31. If the superimposed dimming voltage signal and the first reference voltage Vref1 are greater than the sampled voltage, the feedback voltage signal output from the first operational amplifier OP1 to the feedback terminal of the power conversion circuit 31 increases, thereby increasing the output current of the power conversion circuit 31 and brightening the LED. If the superimposed dimming voltage signal and the first reference voltage Vref1 are not greater than the sampled voltage, the feedback voltage signal output from the first operational amplifier OP1 to the feedback terminal of the power conversion circuit 31 decreases, thereby decreasing the output current of the power conversion circuit 31 and dimming the LED.

[0079] Specifically, when dimming of the LED is not required, the dimming voltage signal remains unchanged, and the voltage at the positive input terminal and the voltage at the negative input terminal of the first operational amplifier OP1 are equal. The feedback voltage signal output by the dimming feedback circuit 32 remains unchanged, and the output current of the power conversion circuit 31 remains unchanged. When the brightness of the LED needs to be increased, the dimming voltage signal decreases, and the voltage at the positive input terminal of the first operational amplifier OP1 is less than the voltage at the negative input terminal. The feedback voltage signal output by the dimming feedback circuit 32 decreases, and the output current of the power conversion circuit 31 increases through negative feedback adjustment, thereby increasing the brightness of the LED. When the brightness of the LED needs to be decreased, the dimming voltage signal increases, and the voltage at the positive input terminal of the first operational amplifier OP1 is greater than the voltage at the negative input terminal. The feedback voltage signal output by the dimming feedback circuit 32 increases, and the output current of the power conversion circuit 31 decreases through negative feedback adjustment, thereby decreasing the brightness of the LED.

[0080] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the first dimming control circuit provided in this application. FB is the feedback terminal of the power conversion circuit, and OUT is the output terminal of the power conversion circuit.

[0081] As can be seen, the circuit structure in this embodiment is simple and easy to operate.

[0082] In addition, the first filter resistor R21 and the first filter capacitor C21 serve to filter the signal, thereby reducing the error of the feedback voltage signal.

[0083] In a preferred embodiment, the dimming feedback circuit 32 includes a second operational amplifier OP2, a second voltage sampling resistor R12, a second filter resistor R22, a second filter capacitor C22, and a third current limiting resistor R33;

[0084] The first end of the second voltage sampling resistor R12 is connected to the output of the power conversion circuit 31, and the second end is connected to the negative input of the second operational amplifier OP2; the first end of the second filter resistor R22 is connected to the second end of the second voltage sampling resistor R12, and the second end is connected to the first end of the second filter capacitor C22; the second end of the second filter capacitor C22 is connected to the output of the second operational amplifier OP2; the first end of the third current limiting resistor R33 is connected to the output of the dimming command receiving circuit 2, and the second end is connected to the negative input of the second operational amplifier OP2; the positive input of the second operational amplifier OP2 is connected to the second reference voltage Vref2, and the output is the output of the dimming feedback circuit 32.

[0085] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of the second dimming control circuit provided in this application.

[0086] In this embodiment, the second voltage sampling resistor R12 is connected to the output terminal of the power conversion circuit 31, enabling it to collect the output current of the power conversion circuit 31 and convert it into a sampling voltage. The output terminal of the dimming command receiving circuit 2 is connected to the positive input terminal of the second operational amplifier OP2 through the third current limiting resistor R33. Therefore, the dimming voltage signal and the sampling voltage are superimposed by the third current limiting resistor R33 and the second voltage sampling resistor R12 and then transmitted to the negative input terminal of the second operational amplifier OP2. The positive input terminal of the second operational amplifier OP2 is directly connected to the second reference voltage Vref2, which means that the dimming voltage signal and the sampling voltage are superimposed. Then, it is compared with the second reference voltage Vref2. If the sum of the dimming voltage signal and the sampling voltage is less than the second reference voltage Vref2, then the feedback voltage signal output by the second operational amplifier OP2 to the feedback terminal of the power conversion circuit 31 increases, thereby increasing the output current of the power conversion circuit 31 and increasing the brightness of the LED. If the sum of the dimming voltage signal and the sampling voltage is not less than the second reference voltage Vref2, then the feedback voltage signal output by the second operational amplifier OP2 to the feedback terminal of the power conversion circuit 31 increases, thereby decreasing the output current of the power conversion circuit 31 and decreasing the brightness of the LED.

[0087] Specifically, when dimming of the LED is not required, the dimming voltage signal remains unchanged, and the voltage at the positive input terminal and the voltage at the negative input terminal of the second operational amplifier OP2 are equal. The feedback voltage signal output by the dimming feedback circuit 32 remains unchanged, and the output current of the power conversion circuit 31 remains unchanged. When the brightness of the LED needs to be increased, the dimming voltage signal increases, and the voltage at the positive input terminal of the second operational amplifier OP2 is less than the voltage at the negative input terminal. The feedback voltage signal output by the dimming feedback circuit 32 decreases, and the output current of the power conversion circuit 31 increases through negative feedback adjustment, thereby increasing the brightness of the LED. When the brightness of the LED needs to be decreased, the dimming voltage signal decreases, and the voltage at the positive input terminal of the second operational amplifier OP2 is greater than the voltage at the negative input terminal. The feedback voltage signal output by the dimming feedback circuit 32 increases, and the output current of the power conversion circuit 31 decreases through negative feedback adjustment, thereby decreasing the brightness of the LED.

[0088] As can be seen, the circuit structure in this embodiment is simple and easy to operate.

[0089] In addition, the second filter resistor R22 and the second filter capacitor C22 serve to filter the signal, thereby reducing the error of the feedback voltage signal.

[0090] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0091] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An LED driver, characterized in that, This includes a dimming type selection circuit, a dimming command receiving circuit, and a dimming control circuit; The output terminal of the dimming type selection circuit is connected to the control terminal of the dimming command receiving circuit. The input terminal of the dimming command receiving circuit is the dimming command receiving terminal, and the output terminal is connected to the control terminal of the dimming control circuit. The input terminal of the dimming control circuit is connected to an AC power supply, and the output terminal is connected to the LED. The dimming command receiving circuit includes at least two dimming command paths, and each dimming command path has a different dimming type. The dimming type selection circuit is used to control the dimming command path corresponding to the dimming type selection command in the dimming command receiving circuit to be turned on based on the received dimming type selection command; the dimming command path turned on in the dimming command receiving circuit is used to convert the dimming command received through the dimming command receiving terminal into a dimming voltage signal and send it to the dimming control circuit, so that the dimming control circuit adjusts the output current of the AC power supply after power conversion and constant current control based on the dimming voltage signal, that is, to dim the LED.

2. The LED driver as described in claim 1, characterized in that, The dimming type selection circuit includes a dimming type selection module and a dimming type control module; The output terminal of the dimming type selection module is connected to the input terminal of the dimming type control module, and the output terminal of the dimming type control module is connected to the control terminal of the dimming command receiving circuit. The dimming type selection module is used to transmit the received dimming type selection instruction to the dimming type control module, so that the dimming type control module controls the dimming instruction path corresponding to the dimming type selection instruction in the dimming instruction receiving circuit to be turned on based on the dimming type selection instruction.

3. The LED driver as described in claim 2, characterized in that, The dimming type selection module includes a wireless signal receiver, which converts the received wireless signal into the dimming type selection instruction and transmits it to the dimming type control module.

4. The LED driver as described in claim 3, characterized in that, The wireless signal receiver is an NFC receiver, and the wireless signal is an NFC signal.

5. The LED driver as described in claim 2, characterized in that, The dimming type selection module includes a DIP switch, and the positions of the DIP switch correspond one-to-one with the dimming command paths in the dimming command receiving circuit. The DIP switch is used to generate the dimming type selection command based on the selected position and transmit it to the dimming type control module.

6. The LED driver as described in claim 1, characterized in that, The dimming command receiving circuit includes a switching module and a dimming signal module; The control terminal of the switch module is connected to the output terminal of the dimming type selection circuit. The first terminal of the switch module is the dimming command receiving terminal. The second terminal of the switch module is connected to the input terminal of the dimming signal module. The output terminal of the dimming signal module is connected to the control terminal of the dimming control circuit. The switch module includes at least two switch paths, and the dimming signal module includes at least two dimming sub-modules. Each dimming sub-module corresponds one-to-one with each switch path, and each switch path and its corresponding dimming sub-module constitute a dimming command path. The switching path in the switching module is used to send the received dimming command to the corresponding dimming submodule, so that the dimming submodule converts the dimming command into a dimming voltage signal and sends it to the dimming control circuit.

7. The LED driver as described in claim 6, characterized in that, The first positive terminal of each of the switch paths is short-circuited, and the first negative terminal of each of the switch paths is short-circuited. The first positive terminal and the first negative terminal of each of the switch paths are the dimming command receiving terminals. The second positive terminal of each of the switch paths is connected to the first input terminal of the corresponding dimming submodule, and the second negative terminal of each of the switch paths is connected to the second input terminal of the corresponding dimming submodule. Each of the switch paths includes a first switch, the first terminal of the first switch is the first positive terminal or the first negative terminal of the switch path, the second terminal of the first switch is the second positive terminal or the second negative terminal of the switch path, and the control terminal of each first switch is the control terminal of each of the switch paths.

8. The LED driver according to any one of claims 1-7, characterized in that, The dimming control circuit includes a power conversion circuit and a dimming feedback circuit; The input terminal of the power conversion circuit is connected to the AC power supply, the feedback terminal is connected to the output terminal of the dimming feedback circuit, and the output terminal is connected to the LED; the first input terminal of the dimming feedback circuit is connected to the output terminal of the dimming command receiving circuit, and the second input terminal is connected to the output terminal of the power conversion circuit. The dimming feedback circuit is used to generate a feedback voltage signal based on the output current of the power conversion circuit and the dimming voltage signal; the power conversion circuit is used to adjust the output current of the AC power supply after power conversion and constant current control based on the feedback voltage signal, that is, to dim the LED.

9. The LED driver as described in claim 8, characterized in that, The dimming feedback circuit includes a first operational amplifier, a first voltage sampling resistor, a first filter resistor, a first filter capacitor, a first current limiting resistor, and a second current limiting resistor; The first end of the first voltage sampling resistor is connected to the output terminal of the power conversion circuit, and the second end is connected to the negative input terminal of the first operational amplifier; the first end of the first filter resistor is connected to the second end of the first voltage sampling resistor, and the second end is connected to the first end of the first filter capacitor; the second end of the first filter capacitor is connected to the output terminal of the first operational amplifier; the first end of the first current limiting resistor is connected to the output terminal of the dimming command receiving circuit, and the second end is connected to the positive input terminal of the first operational amplifier; the first end of the second current limiting resistor is connected to the positive input terminal of the first operational amplifier, and the second end is connected to a first reference voltage; the output terminal of the first operational amplifier is the output terminal of the dimming feedback circuit.

10. The LED driver as claimed in claim 8, characterized in that, The dimming feedback circuit includes a second operational amplifier, a second voltage sampling resistor, a second filter resistor, a second filter capacitor, and a third current limiting resistor; The first end of the second voltage sampling resistor is connected to the output terminal of the power conversion circuit, and the second end is connected to the negative input terminal of the second operational amplifier; the first end of the second filter resistor is connected to the second end of the second voltage sampling resistor, and the second end is connected to the first end of the second filter capacitor; the second end of the second filter capacitor is connected to the output terminal of the second operational amplifier; the first end of the third current limiting resistor is connected to the output terminal of the dimming command receiving circuit, and the second end is connected to the negative input terminal of the second operational amplifier; the positive input terminal of the second operational amplifier is connected to the second reference voltage, and the output terminal is the output terminal of the dimming feedback circuit.

Images