Dimming circuits, control methods and lighting equipment

Abstract

This application provides a dimming circuit, control method, and lighting device. The dimming circuit includes a power supply module configured to provide power voltage to a unidirectional voltage regulator module and a dimming module. The unidirectional voltage regulator module is configured to adjust the power supply voltage to a preset voltage and conduct in one direction. The dimming module is configured to control the light source load to emit or extinguish light according to the power supply voltage and a light source control signal. When the power supply voltage is cut off, the power supply control pin of the dimming module is directly de-energized to synchronously extinguish the light source load. The harmonic suppression pin of the dimming module receives a preset voltage to maintain stable operation of the dimming module. This dimming circuit, by directly connecting the power supply control pin of the dimming module to the power supply module, simultaneously de-energizes the power supply control pin of the dimming module when the power supply is cut off, causing the three primary color light sources and the white light source in the intelligent lighting device to extinguish synchronously, thus improving the user experience.

Description

Technical Field

[0001] This application belongs to the field of dimming technology, and in particular relates to a dimming circuit, control method and lighting device. Background Technology

[0002] With the continuous maturation and development of intelligent lighting technology, more and more intelligent lighting devices are beginning to use a combination of three primary color light sources and white light sources as the load.

[0003] In smart lighting equipment, dimming devices typically control the power supply circuits for the three primary color light sources and the white light source, while voltage regulators filter the power supply connected to the dimming device to maintain it within a stable range. However, because the power supply control pins of the dimming device are generally directly connected to the voltage regulator, the charge stored in the voltage regulator can continue to power the dimming device even after the smart lighting equipment is turned off or the power is disconnected. This can easily lead to asynchronous extinguishing of the three primary color light sources and the white light source in the smart lighting equipment, affecting the user's sensory experience. Summary of the Invention

[0004] The purpose of this application is to provide a dimming circuit, control method, and lighting device, which aims to solve the problem of asynchronous extinguishing of the three primary color light sources and white light source in traditional dimming circuits.

[0005] To achieve the above objectives, in a first aspect, embodiments of this application provide a dimming circuit, including a power supply module, a unidirectional voltage regulator module, and a dimming module;

[0006] The power supply module is electrically connected to the power supply control pins of the unidirectional voltage regulator module and the dimming module, respectively. The unidirectional voltage regulator module is also electrically connected to the harmonic suppression pin of the dimming module.

[0007] The power module is configured to provide power voltage to the unidirectional voltage regulator module and the dimming module;

[0008] The unidirectional voltage regulator module is configured to adjust the power supply voltage to a preset voltage and conduct in one direction.

[0009] The dimming module is configured to control the light source load to emit light or turn off according to the power supply voltage and the light source control signal. When the power supply voltage is cut off, the power supply control pin of the dimming module is directly de-energized so that the light source load turns off synchronously. The harmonic suppression pin of the dimming module receives the preset voltage to maintain the stable operation of the dimming module.

[0010] In another possible implementation of the first aspect, the power module includes a rectifier unit;

[0011] The rectifier unit is electrically connected to the power supply control pins of the unidirectional voltage regulator module and the dimming module, respectively.

[0012] The rectifier unit is configured to rectify external AC voltage into DC voltage.

[0013] In another possible implementation of the first aspect, the dimming circuit further includes a control module;

[0014] The control module is electrically connected to the power module and the dimming module respectively;

[0015] The control module is configured to convert the external dimming signal into the light source control signal;

[0016] The power module is also configured to provide the power voltage to the control module.

[0017] In another possible implementation of the first aspect, the power module includes a voltage conversion unit;

[0018] The voltage conversion unit is electrically connected to the control module;

[0019] The voltage conversion unit is configured to convert the power supply voltage into a preset voltage to supply power to the control module.

[0020] In another possible implementation of the first aspect, the rectifier unit includes a fuse and a rectifier bridge;

[0021] One end of the fuse is electrically connected to the neutral wire of the external AC voltage, the other end of the fuse is electrically connected to the second pin of the rectifier bridge, the first pin of the rectifier bridge is electrically connected to the live wire of the external AC voltage, the fourth pin of the rectifier bridge is grounded, and the third pin of the rectifier bridge is electrically connected to the power supply control pins of the unidirectional voltage regulator module and the dimming module, respectively.

[0022] In another possible implementation of the first aspect, the unidirectional voltage regulator module includes a first diode and a first electrolytic capacitor;

[0023] The positive terminal of the first diode is electrically connected to the power supply module, the negative terminal of the first diode is electrically connected to the positive terminal of the first electrolytic capacitor and the light source load, and the other end of the first electrolytic capacitor is electrically connected to the harmonic suppression pin of the dimming module.

[0024] In another possible implementation of the first aspect, the voltage conversion unit includes a first chip, a second diode, a third diode, a fourth diode, a first inductor, a second inductor, a first capacitor, a second capacitor, a second electrolytic capacitor, a third electrolytic capacitor, a first resistor, a second resistor, and a third resistor;

[0025] The positive terminal of the second diode is electrically connected to the power module, and the negative terminal of the second diode is electrically connected to one end of the first inductor, one end of the first resistor, and one end of the first capacitor. The other end of the first inductor is electrically connected to the fourth pin of the first chip, the other end of the first resistor, and the positive terminal of the second electrolytic capacitor. The other end of the first capacitor and the negative terminal of the second electrolytic capacitor are grounded.

[0026] The second and third pins of the first chip are both electrically connected to one end of the second capacitor and the negative terminal of the third diode. The first pin of the first chip is electrically connected to the other end of the second capacitor, one end of the second resistor, one end of the second inductor, and the negative terminal of the fourth diode. The positive terminal of the third diode is electrically connected to the other end of the second inductor, one end of the third resistor, the positive terminal of the third electrolytic capacitor, and the control module. The positive terminal of the fourth diode, the other end of the third resistor, and the negative terminal of the third electrolytic capacitor are grounded.

[0027] Secondly, embodiments of this application provide a control method for a dimming circuit, comprising the following steps:

[0028] Acquire external dimming signals;

[0029] When the current current range of the external dimming signal is greater than the preset current range, the current current range is adjusted to the preset current range.

[0030] The dimming current value corresponding to the light source control signal is controlled according to the current range of the external dimming signal.

[0031] In another possible implementation of the second aspect, the preset current range includes multiple ranges, and the external dimming signal corresponds one-to-one with the preset current range.

[0032] Thirdly, embodiments of this application provide a lighting device including the aforementioned dimming circuit.

[0033] The beneficial effects of this application embodiment compared with the prior art are as follows: The dimming circuit described above controls the light source load to light up or turn off according to the power supply voltage and the light source control signal through the dimming module, and directly connects the power supply control pin of the dimming module to the power supply module, so that when the power supply is cut off, the power supply control pin of the dimming module is also cut off, so that the three primary color light sources and the white light source in the intelligent lighting device are turned off synchronously, thereby improving the user experience. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of a first structure of the dimming circuit provided in an embodiment of this application;

[0036] Figure 2 This is a schematic diagram of a second structure of the dimming circuit provided in the embodiments of this application;

[0037] Figure 3 A circuit diagram of the dimming circuit provided in the embodiments of this application;

[0038] Figure 4 This is a first flowchart of a control method for a dimming circuit provided in an embodiment of this application;

[0039] Figure 5 This is a second flowchart of a control method for a dimming circuit provided in an embodiment of this application;

[0040] Figure 6 A schematic diagram of pulse transmission for the control method of the dimming circuit provided in the embodiments of this application.

[0041] Explanation of reference numerals in the attached figures

[0042] 1-Power supply module, 11-Rectifier unit, 12-Voltage conversion unit, 2-Unidirectional voltage regulator module, 3-Dimming module, 4-Control module, 5-Light source load. Detailed Implementation

[0043] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0045] In traditional smart lighting devices that combine three primary color light sources and a white light source, a dimming device typically controls the power supply circuits for both the primary color and white light sources, while a voltage regulator filters the power supply to the dimming device to maintain a stable range. However, because the power supply control pins and harmonic suppression pins of the dimming device are generally directly connected to the voltage regulator, the stored charge in the voltage regulator can continue to power the dimming device even after the smart lighting device is turned off or the power is cut off. This can easily lead to asynchronous extinguishing of the three primary color and white light sources, affecting the user's sensory experience.

[0046] Therefore, this application provides a dimming circuit that controls the light source load to light up or turn off based on the power supply voltage and the light source control signal through a dimming module. The power supply control pin of the dimming module is directly connected to the power supply module, so that when the power is off, the power supply control pin of the dimming module is also de-energized, so that the three primary color light sources and the white light source in the intelligent lighting device are turned off synchronously, thereby improving the user experience.

[0047] The dimming circuit provided in this application will be described in illustrative terms below with reference to the accompanying drawings.

[0048] Figure 1 This is a schematic diagram of a first structure of a dimming circuit provided in an embodiment of this application. See also... Figure 1 As shown, exemplarily, a dimming circuit 100 includes a power supply module 1, a unidirectional voltage regulator module 2, and a dimming module 3; the power supply module 1 is electrically connected to the power supply control pins of the unidirectional voltage regulator module 2 and the dimming module 3 respectively, and the unidirectional voltage regulator module 2 is also electrically connected to the harmonic suppression pin of the dimming module 3.

[0049] Power module 1 is configured to provide power voltage to unidirectional voltage regulator module 2 and dimming module 3.

[0050] The unidirectional voltage regulator module 2 is configured to adjust the power supply voltage to a preset voltage and conduct in one direction.

[0051] The dimming module 3 is configured to control the light source load to emit light or turn off according to the power supply voltage and the light source control signal. When the power supply voltage is cut off, the power supply control pin of the dimming module is directly de-energized so that the light source load turns off synchronously. The harmonic suppression pin of the dimming module receives a preset voltage to maintain the stable operation of the dimming module.

[0052] In this embodiment, when the smart lighting device is turned off and the power module 1 is de-energized, although the input power to the unidirectional voltage regulator module 2 is cut off, the charge stored in the unidirectional voltage regulator module 2 can continue to supply power to the harmonic suppression pin of the dimming module 3, maintaining the harmonic suppression function of the dimming module 3 for a period of time without affecting the extinguishing of the light source load and thus not affecting the user's sensory experience. Simultaneously, when the smart lighting device is turned off and the power module 1 is de-energized, the power supply control pin of the dimming module 3 is directly de-energized, thereby causing the dimming module 3 to control the light source load to extinguish, i.e., the three primary color light sources and the white light source in the smart lighting device are simultaneously extinguished, effectively improving the user experience.

[0053] Figure 2 This is a schematic diagram of a second structure of the dimming circuit provided in an embodiment of this application. For example... Figure 2 As shown, by way of example, the power module 1 includes a rectifier unit 11; the rectifier unit 11 is electrically connected to the power supply control pins of the unidirectional voltage regulator module 2 and the dimming module 3 respectively.

[0054] The rectifier unit 11 is configured to rectify an external AC voltage into a DC voltage.

[0055] In this embodiment, the externally input AC voltage is rectified into DC voltage by the rectifier unit 11 for use by the unidirectional voltage regulator module 2 and the dimming module 3. The externally input AC voltage can be 220V or 230V AC.

[0056] For example, such as Figure 2 As shown, the dimming circuit 100 also includes a control module 4; the control module 4 is electrically connected to the power supply module 1 and the dimming module 3 respectively.

[0057] Control module 4 is configured to convert external dimming signals into light source control signals.

[0058] Power module 1 is also configured to provide power voltage to control module 4.

[0059] In this embodiment, power module 1 provides power voltage to control module 4 to enable control module 4 to operate. Control module 4 receives external dimming signals and converts them into light source control signals, which are then sent to dimming module 3. Dimming module 3 then controls the light source load 5 to emit or extinguish light according to the light source control signals. The external dimming signal can be generated either by the radio frequency signal from a user remote control or by a control chip. Control module 4 and dimming module 3 are connected via an Inter-Integrated Circuit (I2C) bus. 2 C) Bus connection: The light source control signal generated by control module 4 is transmitted through I... 2The C-bus sends the signal to the dimming module 3 and locks it within the dimming module 3.

[0060] For example, such as Figure 2 As shown, the power module 1 includes a voltage conversion unit 12; the voltage conversion unit 12 is electrically connected to the control module 4.

[0061] The voltage conversion unit 12 is configured to convert the power supply voltage into a preset voltage to supply power to the control module 4.

[0062] In this embodiment, the power supply voltage is converted into a constant preset voltage by the voltage conversion unit 12 to supply power to the control module 4. The preset voltage can be 3.3V, which meets the voltage requirements of the control module 4.

[0063] Figure 3 A circuit diagram of a dimming circuit provided in an embodiment of this application. Exemplarily, as shown... Figure 3 As shown, the rectifier unit 11 includes a fuse FR and a rectifier bridge BD.

[0064] One end of fuse FR is electrically connected to the neutral wire ACN1 of the external AC voltage, and the other end of fuse FR is electrically connected to the second pin of rectifier bridge BD. The first pin of rectifier bridge BD is electrically connected to the live wire ACL2 of the external AC voltage. The fourth pin of rectifier bridge BD is grounded, and the third pin of rectifier bridge BD is electrically connected to the power supply control pins of unidirectional voltage regulator module 2 and dimming module 3, respectively.

[0065] In this embodiment, when the current flowing through fuse FR is too high, fuse FR automatically melts to prevent excessive current from entering rectifier unit 11 and damaging subsequent circuits. The unidirectional conduction function of rectifier bridge BD rectifies the external AC voltage into DC voltage for use by subsequent circuits.

[0066] For example, such as Figure 3 As shown, the unidirectional voltage regulator module 2 includes a first diode D1 and a first electrolytic capacitor EC1.

[0067] The positive terminal of the first diode D1 is electrically connected to the power supply module 1, the negative terminal of the first diode D1 is electrically connected to the positive terminal of the first electrolytic capacitor EC1 and the light source load 5, and the other end of the first electrolytic capacitor EC1 is electrically connected to the harmonic suppression pin of the dimming module 3.

[0068] In this embodiment, when the power module 1 is powered off, the charge stored in the first electrolytic capacitor EC1 continues to flow to the harmonic suppression pin of the dimming module 3, thus maintaining the harmonic suppression function of the dimming module 3. Through the unidirectional conduction principle of the first diode D1, when the power module 1 is powered off, the charge stored in the electrolytic capacitor EC1 can be prevented from flowing back to the power module 1.

[0069] like Figure 3 As shown, by way of example, the voltage conversion unit 12 includes a first chip U1, a second diode D2, a third diode D3, a fourth diode D4, a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, a second electrolytic capacitor EC2, a third electrolytic capacitor EC3, a first resistor R1, a second resistor R2, and a third resistor R3.

[0070] The positive terminal of the second diode D2 is electrically connected to the power module 1. The negative terminal of the second diode D2 is electrically connected to one end of the first inductor L1, one end of the first resistor R1, and one end of the first capacitor C1. The other end of the first inductor L1 is electrically connected to the fourth pin of the first chip U1, the other end of the first resistor R1, and the positive terminal of the second electrolytic capacitor EC2. The other end of the first capacitor C1 and the negative terminal of the second electrolytic capacitor EC2 are grounded.

[0071] The second and third pins of the first chip U1 are both electrically connected to one end of the second capacitor C2 and the negative terminal of the third diode D3. The first pin of the first chip U1 is electrically connected to the other end of the second capacitor C2, one end of the second resistor R2, one end of the second inductor L2, and the negative terminal of the fourth diode D4. The positive terminal of the third diode D3 is electrically connected to the other end of the second inductor L2, one end of the third resistor R3, the positive terminal of the third electrolytic capacitor EC3, and the control module 4. The positive terminal of the fourth diode D4, the other end of the third resistor R3, and the negative terminal of the third electrolytic capacitor EC3 are grounded.

[0072] In this embodiment, the second diode D2, which conducts unidirectionally and blocks in reverse, prevents the current in the voltage conversion unit 12 from flowing back into the rectifier unit 11 or the external power supply, thereby protecting the rectifier unit 11 and the external power supply. A filter circuit composed of the first inductor L1, the first resistor R1, the first capacitor C1, and the second electrolytic capacitor EC2 filters the input voltage of the voltage conversion unit 12. The first chip U1, acting as a voltage conversion chip, converts the input voltage into a preset voltage (e.g., the 3.3V required by the control module 4). A power supply circuit composed of the second capacitor C2 and the third diode D3 supplies power to the first chip U1. The second resistor R2 and the second inductor L2, in conjunction with the first chip U1, convert the input voltage into the preset voltage to supply power to the control module 4. The second resistor R2 and the third electrolytic capacitor EC3 filter the output voltage of the voltage conversion unit 12.

[0073] like Figure 3As shown, exemplarily, the dimming module 3 includes a second chip U2, a fifth diode D5, and a sixth diode D6. The cathode of the fifth diode D5 is electrically connected to both the unidirectional voltage regulator module 2 and the anode of the sixth diode D6, the cathode of the sixth diode D6 is electrically connected to the sixth pin of the second chip U2, and the anode of the fifth diode D5 is grounded.

[0074] In this embodiment, the second chip U2 controls the light source load 5 to emit light or turn off according to the power supply voltage and the light source control signal. The fifth diode D5 and the sixth diode D6, together with the first electrolytic capacitor EC1, ensure that the input voltage meets the harmonic requirements of the second chip U2.

[0075] like Figure 3 As shown, for example, the control module 4 includes a third chip U3, a fourth resistor R4, and a fifth resistor R5.

[0076] The 3.3V power supply pin of the third chip U3 is electrically connected to the voltage conversion unit 12, one end of the fourth resistor R4, and one end of the fifth resistor R5, respectively. The data pin SDA of the third chip U3 is electrically connected to the other end of the fourth resistor R4 and the dimming module 3, respectively. The clock pin SCL of the third chip U3 is electrically connected to the other end of the fifth resistor R5 and the dimming module 3, respectively.

[0077] In this embodiment, the external dimming signal (i.e., the control signal from the controller or the radio frequency signal from the remote control) is converted into a light source control signal by the third chip U3, which may include a clock signal and a data signal, and sent to the dimming module 3. The fourth resistor R4 and the fifth resistor R5 are used as pull-up resistors.

[0078] like Figure 3 As shown, exemplarily, the light source load 5 includes a red LED module, a green LED module, a blue LED module, a cool white LED module, and a warm white LED module.

[0079] The input terminals of the red, green, blue, cool white, and warm white LED modules are all electrically connected to the unidirectional voltage regulator module 2, and the output terminals of the red, green, blue, cool white, and warm white LED modules are electrically connected to multiple pins of the dimming module 3. Each of the red, green, blue, cool white, and warm white LED modules is composed of multiple LEDs connected in series.

[0080] In this embodiment, a three-primary-color light source is formed by red LED modules, green LED modules, and blue LED modules, and a white light source is formed by cool white LED modules and warm white LED modules, thereby obtaining a combination of light from the three-primary-color light source and the white light source.

[0081] The dimming circuit of this application controls the light source load to light up or turn off according to the power supply voltage and the light source control signal through the dimming module. The power supply control pin of the dimming module is directly electrically connected to the power supply module. Thus, when the power supply is cut off, the power supply control pin of the dimming module is also cut off, so that the three primary color light sources and the white light source in the intelligent lighting device are turned off synchronously, thereby improving the user experience.

[0082] Based on the dimming circuit provided in this embodiment, the control method of the dimming circuit will be described in detail below.

[0083] For example, Figure 4 This is a first flowchart of a control method for a dimming circuit provided in an embodiment of this application. Figure 5 This is a second flowchart illustrating the control method for the dimming circuit provided in an embodiment of this application. (See attached flowchart.) Figure 4 and Figure 5 As shown, a method for controlling a dimming circuit includes the following steps:

[0084] S100: Obtain external dimming signal.

[0085] S200. When the current current range of the external dimming signal is greater than the preset current range, adjust the current current range to the preset current range.

[0086] S201. Determine whether the current current range of the external dimming signal is greater than the preset current range. If yes, proceed to S202; otherwise, proceed to S203.

[0087] S202. Adjust the current current range to the preset current range.

[0088] S203. Keep the current current range unchanged.

[0089] S300: Control the dimming current value corresponding to the light source control signal according to the current range of the external dimming signal.

[0090] In this embodiment, when the controller receives an external dimming signal from a terminal device or remote control, it first determines whether the current range of the external dimming signal is greater than a preset current range. If so, the current range is adjusted to the preset current range; otherwise, the current range remains unchanged. Then, the dimming current value of the light source control signal is controlled according to the current range of the external dimming signal. Multiple preset current ranges are included, and each external dimming signal corresponds to one preset current range. This allows the current range of the external dimming signal to be adjusted in real time based on minute changes in the external dimming signal and its preset current range.

[0091] For example, when the full-load dimming current is 30mA, the dimming grayscale is (1 / 1024)*30mA, and the minimum output current is (1 / 1024)*30mA without changing the current range. However, when using the improved dimming method of this application, when the full-load dimming current is 30mA, the current range can be adjusted in real time according to the preset current range corresponding to the external dimming signal, for example, 1mA. The resulting grayscale and dimming depth are (1 / 1024)*1mA, thereby making the step change of the dimming current value of the light source load smaller, the dimming accuracy higher, the dimming curve smoother, and the dimming depth lower, effectively improving the user's sensory experience.

[0092] In another embodiment of this application, different current ranges can be represented by 7 bits in a byte, i.e., B[6:0]. For example, 0000000 represents a current range of 0, 0000001 represents a current range of 1mA, ..., 0001010 represents a current range of 10mA, ..., 0111100 represents a current range of 60mA, and 1111100 represents a current range of 90mA. The default current range can be 10mA.

[0093] Figure 6 This is a schematic diagram of pulse transmission for the control method of the dimming circuit provided in an embodiment of this application. Figure 6 As shown, in another embodiment of this application, the light source control signal includes a clock signal SCL and a data signal SDA, performing serial bit transmission. Each clock pulse transmits one bit of data, and 8 bits and one Auto Colour Killer (ACK) signal correspond to one byte. Furthermore, during byte signal transmission, the current range and current grayscale values ​​can be set in advance so that subsequent light source control signals can be directly referenced, as shown in Table 1 below:

[0094] Table 1: Byte Transmission Content Table

[0095]

[0096]

[0097] For example, an embodiment of this application provides a lighting device including a dimming circuit 100.

[0098] The dimming circuit 100 of this application is installed inside a lighting device, which can be a bulb lamp or a ceiling light, etc. The dimming module controls the light source load to light up or turn off based on the power supply voltage and light source control signal. The power supply control pin of the dimming module is directly electrically connected to the power supply module, so that when the power is off, the power supply control pin of the dimming module is simultaneously de-energized, causing the three primary color light sources and the white light source in the intelligent lighting device to turn off synchronously, improving the user experience.

[0099] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0100] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific identification information of each functional unit and module is only for easy differentiation and is not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing embodiments, and will not be repeated here.

[0101] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0102] Those skilled in the art will recognize that the units of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0103] In the embodiments provided in this application, it should be understood that the control method for the disclosed dimming circuit can be implemented in other ways. For example, the embodiments of the control method for the dimming circuit described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some multi-interface systems, devices, or units, and may be electrical, mechanical, or other forms.

[0104] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0105] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0106] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A dimming circuit, characterized in that, Includes a power supply module, a unidirectional voltage regulator module, and a dimming module; The power supply module is electrically connected to the power supply control pins of the unidirectional voltage regulator module and the dimming module, respectively. The unidirectional voltage regulator module is also electrically connected to the harmonic suppression pin of the dimming module. The power module is configured to provide power voltage to the unidirectional voltage regulator module and the dimming module; The unidirectional voltage regulator module is configured to adjust the power supply voltage to a preset voltage and conduct in one direction. The dimming module is configured to control the light source load to emit light or turn off according to the power supply voltage and the light source control signal, and when the power supply voltage is cut off, the power supply control pin of the dimming module is directly de-energized so that the light source load turns off synchronously; and the harmonic suppression pin of the dimming module receives the preset voltage to maintain the stable operation of the dimming module. The unidirectional voltage regulator module includes a first diode and a first electrolytic capacitor; The positive terminal of the first diode is electrically connected to the power supply module, the negative terminal of the first diode is electrically connected to the positive terminal of the first electrolytic capacitor and the light source load, and the other end of the first electrolytic capacitor is electrically connected to the harmonic suppression pin of the dimming module.

2. The circuit according to claim 1, characterized in that, The power module includes a rectifier unit; The rectifier unit is electrically connected to the power supply control pins of the unidirectional voltage regulator module and the dimming module, respectively. The rectifier unit is configured to rectify external AC voltage into DC voltage.

3. The circuit as described in claim 1 or 2, characterized in that, The dimming circuit also includes a control module; The control module is electrically connected to the power module and the dimming module respectively; The control module is configured to convert the external dimming signal into the light source control signal; The power module is also configured to provide the power voltage to the control module.

4. The circuit according to claim 3, characterized in that, The power module includes a voltage conversion unit; The voltage conversion unit is electrically connected to the control module; The voltage conversion unit is configured to convert the power supply voltage into a preset voltage to supply power to the control module.

5. The circuit as described in claim 2, characterized in that, The rectifier unit includes a fuse and a rectifier bridge; One end of the fuse is electrically connected to the neutral wire of the external AC voltage, the other end of the fuse is electrically connected to the second pin of the rectifier bridge, the first pin of the rectifier bridge is electrically connected to the live wire of the external AC voltage, the fourth pin of the rectifier bridge is grounded, and the third pin of the rectifier bridge is electrically connected to the power supply control pins of the unidirectional voltage regulator module and the dimming module, respectively.

6. The circuit as described in claim 4, characterized in that, The voltage conversion unit includes a first chip, a second diode, a third diode, a fourth diode, a first inductor, a second inductor, a first capacitor, a second capacitor, a second electrolytic capacitor, a third electrolytic capacitor, a first resistor, a second resistor, and a third resistor; The positive terminal of the second diode is electrically connected to the power module, and the negative terminal of the second diode is electrically connected to one end of the first inductor, one end of the first resistor, and one end of the first capacitor. The other end of the first inductor is electrically connected to the fourth pin of the first chip, the other end of the first resistor, and the positive terminal of the second electrolytic capacitor. The other end of the first capacitor and the negative terminal of the second electrolytic capacitor are grounded. The second and third pins of the first chip are both electrically connected to one end of the second capacitor and the negative terminal of the third diode. The first pin of the first chip is electrically connected to the other end of the second capacitor, one end of the second resistor, one end of the second inductor, and the negative terminal of the fourth diode. The positive terminal of the third diode is electrically connected to the other end of the second inductor, one end of the third resistor, the positive terminal of the third electrolytic capacitor, and the control module. The positive terminal of the fourth diode, the other end of the third resistor, and the negative terminal of the third electrolytic capacitor are grounded.

7. A control method based on the dimming circuit according to any one of claims 1-6, characterized in that, Includes the following steps: Acquire external dimming signals; When the current current range of the external dimming signal is greater than the preset current range, the current current range is adjusted to the preset current range. The dimming current value corresponding to the light source control signal is controlled according to the current range of the external dimming signal.

8. The method as described in claim 7, characterized in that, The preset current range includes multiple ranges, and the external dimming signal corresponds one-to-one with the preset current range.

9. A lighting device, characterized in that, Includes the dimming circuit as described in any one of claims 1-6.

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