Dimming circuit and device
By controlling the switching frequency of the controllable switch through the instruction input module and processor in the dimming circuit, brightness adjustment is achieved, solving the problem of fixed brightness in existing dimming lights and providing flexible brightness adjustment and a superior user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-06
- Publication Date
- 2026-03-06
AI Technical Summary
Existing dimmable lights have a fixed degree of brightness variation, which makes it difficult to meet the personalized needs of different users in the same environment, lacking flexibility and user experience.
Design a dimming circuit including an instruction input module, a processor, and a controllable switch. The brightness control signal is generated by the user instruction, and the processor controls the switching frequency of the controllable switch to achieve brightness adjustment. Dimming is achieved by alternating between on and off states to avoid continuous light emission.
It achieves flexible brightness adjustment, meets various user needs, improves user experience, and has a simple structure and low cost.
Smart Images
Figure CN223978774U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuits, and in particular to a dimming circuit and device. Background Technology
[0002] As living standards improve, users have increasingly higher demands for light and higher requirements for light quality. Users' brightness requirements vary depending on the scenario, time, or functional needs. Therefore, achieving dimming functionality to meet these diverse brightness requirements is a crucial direction for the development of lighting fixtures.
[0003] Most existing dimmable lights are automatic dimming LED lights, whose brightness changes with the ambient light level; they are essentially off during the day and illuminate at night. However, under the same ambient light conditions, the brightness of these lights is fixed, and the degree of brightness variation is mostly fixed to the factory setting, making it difficult to modify. In practical applications, however, different users have different brightness requirements in the same environment. Therefore, how to achieve a more flexible dimming function that meets user needs has become an urgent technical problem to be solved. Utility Model Content
[0004] The purpose of this invention is to provide a dimming circuit and device that can flexibly dim according to user instructions, offering greater flexibility and maximizing the satisfaction of various dimming needs, thereby improving the user experience. The entire circuit structure is simple, easy to implement, and inexpensive.
[0005] To solve the above-mentioned technical problems, this utility model provides a dimming circuit, comprising:
[0006] The instruction input module is used to output different brightness control signals according to the instructions;
[0007] The processor has a signal detection terminal connected to the output terminal of the instruction input module, a power supply terminal connected to the first power supply voltage, and a ground terminal grounded. It is used to control the controllable switch to turn on and off according to the frequency corresponding to the brightness control signal.
[0008] The controllable switch has its control terminal connected to the output terminal of the processor, its first terminal connected to the first terminal of the indicator light, and its second terminal grounded.
[0009] Optional, also includes:
[0010] The first resistor has its first end connected to the signal detection terminal of the processor and its second end connected to the output terminal of the instruction input module, and is used to stably output the brightness control signal to the processor.
[0011] Optional, also includes:
[0012] The first current limiting module has its first terminal connected to the second power supply voltage and its second terminal connected to the second terminal of the indicator light.
[0013] Optional, also includes:
[0014] The second current limiting module has its first end connected to the output end of the processor and its second end connected to the control end of the controllable switch.
[0015] Optional, also includes:
[0016] The filtering module has a first terminal connected to the first power supply voltage and connected to the power supply terminal of the processor, and a second terminal grounded.
[0017] Optionally, the filtering module includes:
[0018] The first capacitor has its first terminal grounded.
[0019] The second capacitor has a first terminal grounded and a second terminal connected to the first power supply voltage, and is connected to the second terminal of the first capacitor and the power supply terminal of the processor, respectively.
[0020] Optional, also includes:
[0021] The power supply circuit has an input terminal connected to the power supply and an output terminal connected to the power supply terminal of the processor and the second terminal of the indicator light, respectively, for converting the power supply into a first power supply voltage required by the processor and a second power supply voltage required by the indicator light.
[0022] Optionally, the power supply circuit includes:
[0023] A linear regulator, with its input terminal connected to the power supply, its output terminal serving as the output terminal of the power circuit, and its ground terminal grounded, is used to regulate the power supply to the target voltage.
[0024] The third capacitor has its first end connected to the input terminal of the linear regulator and the power supply, and its second end grounded, and is used to stabilize the voltage output to the input terminal of the linear regulator.
[0025] Optionally, the power supply circuit further includes:
[0026] The third current limiting module has its first terminal grounded.
[0027] The prompting module has a first terminal serving as the output terminal of the power supply circuit and connected to the output terminal of the linear regulator, and a second terminal connected to the second terminal of the third current limiting module, used to indicate the voltage output status of the power supply circuit.
[0028] To solve the above-mentioned technical problems, this utility model also provides a dimming device, including a dimming object and a dimming circuit as described above, wherein the dimming circuit is connected to the dimming object.
[0029] This invention provides a dimming circuit, including an instruction input module, a processor, and a controllable switch. The instruction input module outputs different brightness control signals according to different user instructions. The processor controls the controllable switch to turn on and off at different switching frequencies based on the different brightness control signals. By changing the switching frequency of the controllable switch, the brightness of the indicator light is adjusted, thereby realizing the touch dimming process. During this process, the indicator light is not continuously lit, but rather constantly turning on and off. When the alternation between on and off is fast enough, the naked eye will perceive that the indicator light is always on. It can flexibly dim according to user instructions, offering greater flexibility and maximizing the satisfaction of various dimming needs, thus improving the user experience. The entire circuit structure is simple, easy to implement, and inexpensive.
[0030] This invention also provides a dimming device that has the same beneficial effects as the dimming circuit described above. Attached Figure Description
[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the prior art and 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.
[0032] Figure 1 A schematic diagram of a dimming circuit provided by this utility model;
[0033] Figure 2 A schematic diagram of a dimming device provided by this utility model;
[0034] Figure 3 This is a schematic diagram of another dimming circuit provided by this utility model;
[0035] Figure 4 A schematic diagram of a power supply circuit provided by this utility model;
[0036] Figure 5 This is a schematic diagram of a dimming device implemented by an integrated chip, which is provided by this utility model. Detailed Implementation
[0037] The core of this utility model is to provide a dimming circuit and device that can flexibly dim according to user instructions, making it more flexible and able to meet various dimming needs of users to the greatest extent, thereby improving the user experience. The entire circuit structure is simple, easy to implement, and low in cost.
[0038] 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.
[0039] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a dimming circuit provided by this utility model; please refer to... Figure 2 , Figure 2 This utility model provides a schematic diagram of a dimming device; to solve the above-mentioned technical problems, this utility model provides a dimming circuit, including:
[0040] The instruction input module P1 is used to output different brightness control signals according to the instruction;
[0041] The processor U1 has its signal detection terminal connected to the output terminal of the instruction input module P1, its power supply terminal connected to the first power supply voltage, and its grounding terminal grounded. It is used to control the controllable switch Q1 to turn on and off according to the frequency corresponding to the brightness control signal.
[0042] The controllable switch Q1 has its control terminal connected to the output terminal of the processor U1, its first terminal connected to the first terminal of the indicator LED0, and its second terminal grounded.
[0043] It is easy to understand that when a user has a need to adjust the brightness, they can input different commands into the command input module P1. Based on this, the command input module P1 generates different brightness control signals and outputs them to the signal detection terminal of the processor U1. The output terminal of the processor U1 is connected to the control terminal of the controllable switch Q1, so that it outputs different drive signals according to the different brightness control signals received to control the controllable switch Q1 to operate at different switching frequencies. The controllable switch Q1 is connected in series with the display lamp LED0. Under the operation of the controllable switch Q1 at different switching frequencies, the display lamp LED0 will show different brightness, thereby realizing the dimming process.
[0044] It should be noted that the dimming achieved by the processor U1 through controlling the switching frequency of the controllable switch Q1 mainly relies on the alternating on and off states of the indicator LED0. In this application, brightness adjustment does not rely on changing the power, but rather on the alternating on and off states of the LED. When the controllable switch Q1 is connected in series with the indicator LED0, the process of the second power supply voltage illuminating the indicator LED0 is not continuous; rather, the indicator LED0 is constantly turning on and off. When the on-off alternation is fast enough, the naked eye will perceive that the indicator LED0 is always on. During the on-off process of the indicator LED0, the longer the off state lasts, the lower the perceived brightness of the indicator LED0. The longer the on time, the shorter the off time, and the brighter the indicator LED0 appears.
[0045] It is understood that this application does not impose any special limitations on the specific types and implementation methods of the instruction input module P1, processor U1, and controllable switch Q1. The instruction input module P1 can be a touch button implemented using capacitive touch technology, or it can be an instruction receiving device supporting remote control, etc., and can be selected and set according to the user's actual application needs. The controllable switch Q1 can be implemented using controllable switching devices such as transistors, and there are multiple implementation methods. The processor U1 can be implemented using various types of processing chips or microcontrollers, and can be selected and set according to the control program required by the user. This application does not impose any special limitations on the specific value and implementation method of the first power supply voltage, such as... Figure 2 As shown, this can be achieved using a 3.3V power supply voltage.
[0046] It is not difficult to understand that this application does not specifically limit the specific implementation methods of different instructions corresponding to the instruction input module P1, nor the specific control methods of the processor U1 on the controllable switch Q1. The control logic of the processor U1 for the dimming process also has multiple options, which this application does not specifically limit and can be set and adjusted according to the user's actual needs. Specifically, the processor U1 can use PWM (Pulse-Width Modulation) signals to control the controllable switch Q1 through PWM adjustment. PWM adjustment can reduce the average power transmitted by the electrical signal by dispersing the effective electrical signal into a discrete form. Therefore, according to the area equivalence rule, by changing the pulse time width in the PWM signal, the waveform with the required synthesized amplitude and frequency can be obtained equivalently, thereby realizing the control of the controllable switch Q1. The instruction input module P1 can be implemented using the capacitive touch principle. This principle refers to the fact that when a finger touches the metal layer, a coupling capacitor is formed between the human body's electric field, the user, and the touchscreen surface. For high-frequency currents, the capacitor acts as a direct conductor, causing the finger to draw a small current from the contact point. This current flows out from electrodes at the four corners of the touchscreen, and the current flowing through these four electrodes is proportional to the distance from the finger to each corner. The controller calculates the precise ratio of these four currents to determine the touch point's location. In this case, the user can adjust the brightness of the LED0 indicator by touching it with their finger.
[0047] In one specific embodiment, the instruction input module P1 is implemented using a touchscreen or touch buttons. The brightness control signal is achieved through touch signals detected by the touchscreen. When a user touches the touchscreen or touch buttons with their finger, a corresponding capacitance is generated. The processor U1 is implemented using a chip IC—RH6616—that supports capacitive touch sensing and PWM dimming. This embodiment provides a specific control logic for the processor U1: after the dimming circuit is powered on, it waits for a touch signal. If the initial detected touch signal is a short touch, the device is officially powered on, and the brightness remains at the brightness level of the last time it was powered off, thus achieving a memory function. If the initial detected touch signal is a long touch, there is no response. After officially powering on via a short touch, the first long touch signal will continuously increase the brightness until it reaches its maximum; the next long touch signal will continuously decrease the brightness until it reaches its minimum, and the next long touch signal will increase the brightness again, and so on. Furthermore, any short touch after powering on will return the device to a power-off state. The entire dimming circuit can detect and recognize the input capacitive touch signal through the long and short presses of the touch screen. At the same time, the processor U1 can output an adjustable duty cycle PWM signal to drive the LED0 indicator light to achieve dimming. Additionally, a setting latch can be added to the processor U1 to realize the brightness memory function, which can lock the state at a certain moment.
[0048] Specifically, the RH6616 chip operates at a voltage of 2.4V to 5.5V, has a standby current of less than 20uA at 3V, performs rapid initialization in 0.5s upon power-on, and features environmental adaptability, enabling it to quickly respond to application scenarios such as power-on before covering media or touch-based power-on. It boasts reliable power-on reset (POR) and low-voltage reset (LVR) performance, and its PWM output provides 256 levels of brightness with a PWM frequency up to 4kHz, effectively reducing flicker during LED dimming. Its package types include SOP8, DIP8, and SOT23-6. Based on the chip's datasheet, it can be used to design applications such as... Figure 2 The dimming circuit shown has a simple overall structure and can meet the functional requirements described above.
[0049] It is understood that this application does not impose any particular limitations on the specific type and implementation method of the LED0 indicator light, and it can be implemented using LED (light-emitting diode) lights or other methods. The dimming circuit provided in this application can be applied to touch-dim LED desk lamps, touch-dim LED wall lamps, or other touch-dim products that require PWM output control, as well as dimming products that dim using other methods.
[0050] This invention provides a dimming circuit, including an instruction input module P1, a processor U1, and a controllable switch Q1. The instruction input module P1 outputs different brightness control signals according to different user instructions. The processor U1 controls the controllable switch Q1 to turn on and off at different switching frequencies according to different brightness control signals. By using the change in the switching frequency of the controllable switch Q1, the brightness of the indicator LED0 is adjusted, thereby realizing the touch dimming process. During this process, the indicator LED0 is not continuously lit, but constantly turning on and off. When the alternation between on and off is fast enough, the naked eye will perceive that the indicator LED0 is always on. It can flexibly dim according to user instructions, making it more flexible and able to meet various dimming needs of users to the greatest extent, improving the user experience. The entire circuit structure is simple, easy to implement, and low in cost.
[0051] Based on the above embodiments: Please refer to Figure 3 , Figure 3 This is a schematic diagram of another dimming circuit provided by this utility model.
[0052] As an optional embodiment, it also includes:
[0053] The first resistor R1 has its first end connected to the signal detection terminal of the processor U1 and its second end connected to the output terminal of the instruction input module P1, and is used to stably output the brightness control signal to the processor U1.
[0054] It's easy to understand that, in order to improve the stability and reliability of the brightness control signal output to the processor U1, especially when the brightness control signal is implemented through a touch signal, which has inherently poor stability, a first resistor R1 can be added between the signal detection terminal TCH of the processor U1 and the instruction input module P1, such as... Figure 2 As shown, Figure 2 A 5.1kΩ resistor R1 is pulled to the touch button. The first resistor R1 is used to improve the anti-interference capability of the touch signal, i.e., the brightness control signal. This application does not make any special restrictions on the specific type and implementation of the first resistor R1, and the specific resistance value can be selected and adjusted according to the actual application scenario.
[0055] Specifically, by adding a first resistor R1 between the signal detection terminal TCH of the processor U1 and the instruction input module P1, the brightness control signal output to the processor U1 can be effectively stabilized, the anti-interference capability of the brightness control signal can be improved, and the accurate implementation of the subsequent control process of the processor U1 on the controllable switch Q1 can be ensured.
[0056] As an optional embodiment, it also includes:
[0057] The first current limiting module RX1 has its first terminal connected to the second power supply voltage and its second terminal connected to the second terminal of the indicator LED0.
[0058] It is easy to understand that the indicator LED0 needs to be connected to a power supply to emit light. Considering that the power supply voltage may be relatively high, directly connecting the indicator LED0 to the power supply voltage could result in excessive current and overcurrent. Therefore, a first current-limiting module RX1, connected in series with the indicator LED0 and the controllable switch Q1, can be added to limit the operating current of the indicator LED0 and protect both the indicator LED0 and the controllable switch Q1. This application does not specifically limit the specific type and implementation method of the first current-limiting module RX1; it can be implemented using a resistor, such as... Figure 2 As shown, the first current limiting module RX1 can be implemented using a 1KΩ resistor. This application does not specifically limit the value and implementation method of the second power supply voltage required for the indicator LED0; it can be implemented in the same way as the first power supply voltage, such as... Figure 2 As shown, the second power supply voltage is also implemented using a voltage of 3.3V.
[0059] Specifically, by adding a first current limiting module RX1, the operating current of the indicator LED0 during its illumination process can be effectively limited, preventing overcurrent in the circuit containing the indicator LED0, further protecting the indicator LED0 and the controllable switch Q1, and ensuring the safety and reliability of the entire dimming circuit. The structure is simple, easy to implement, and inexpensive, which is conducive to the simple implementation of the entire dimming circuit.
[0060] As an optional embodiment, it also includes:
[0061] The second current limiting module RX2 has its first end connected to the output end of the processor U1 and its second end connected to the control end of the controllable switch Q1.
[0062] It is easy to understand that, considering the possibility of excessive output voltage impacting the control terminal of the controllable switch Q1 when the output terminal of the processor U1 is directly connected to the control terminal of the controllable switch Q1, potentially causing device damage, a second current-limiting module RX2 can be added to both the output terminal of the processor U1 and the control terminal of the controllable switch Q1 to further protect the controllable switch Q1. This application does not specifically limit the specific type and implementation method of the second current-limiting module RX2; it can be implemented using a resistor, such as... Figure 2 As shown, the second current-limiting module RX2 can be implemented using a 1KΩ resistor. Figure 2 As shown, the PWM output terminal POUT of the processor U1 is connected to the base of the transistor, which is a controllable switch Q1, through the current-limiting resistor of the second current-limiting module RX2, so that the controllable switch Q1 can be turned on and off at a set frequency, thereby driving the LED above. The brightness of the LED is determined by the duty cycle of the PWM.
[0063] Specifically, by adding a second current limiting module RX2, the current output from the processor U1 to the control terminal of the controllable switch Q1 can be effectively limited, further protecting the controllable switch Q1 and ensuring the safety and reliability of the entire dimming circuit. The structure is simple, easy to implement, and inexpensive, which is conducive to the simple implementation of the entire dimming circuit.
[0064] As an optional embodiment, it also includes:
[0065] The filter module has a first terminal connected to the first power supply voltage and connected to the power supply terminal VDD of the processor U1, and a second terminal grounded.
[0066] It is easy to understand that a filtering module can be further added to the power supply terminal of the processor U1. The filtering module can filter the first power supply voltage to a certain extent, thereby filtering out some noise, improving the anti-interference capability of the voltage output to the power supply terminal of the processor U1, and ensuring the normal operation of the processor U1. This application does not make any special restrictions on the specific type and implementation method of the filtering module, which can be implemented by means of capacitors, etc.
[0067] Specifically, by adding a filter module to the power supply terminal of the processor U1, the stability and reliability of the power supply process to the processor U1 can be effectively ensured, thereby ensuring that the processor U1 can complete its work normally and stably, and ensuring the reliability of the entire dimming circuit.
[0068] As an optional embodiment, the filtering module includes:
[0069] The first capacitor C1 has its first terminal grounded.
[0070] The second capacitor C2 has its first end grounded and its second end connected to the first power supply voltage. It is also connected to the second end of the first capacitor C1 and the power supply terminal of the processor U1, respectively.
[0071] It is understood that the filtering module can be implemented using capacitors, and can also be further implemented using two capacitors connected in parallel, namely C1 and C2. Using two capacitors in parallel can further improve the reliability and response speed of the entire filtering module. This application does not specifically limit the specific type, value, or implementation method of the first capacitor C1 and the second capacitor C2. Specifically, the first capacitor C1 can be implemented using a 10μF / 10V capacitor, and the second capacitor C2 can be implemented using a 100nF / 10V capacitor.
[0072] Furthermore, to provide users with more dimming options, a setting pin J2 can be added. The FSEL pin of the processor U1 is used to adjust the output dimming PWM frequency, and a 3-pin setting pin J2 is used to bring it out in the circuit. Users can directly use the setting pin J2 to input the corresponding frequency adjustment command to the processor U1 to achieve another form of dimming. The setting pin J2 can directly reuse the second power supply voltage of the indicator LED0 to work. At the same time, a 47KΩ resistor R2 can be added between the setting pin J2 and the second power supply voltage to implement the current limiting process of the setting pin J2. This process can also be achieved through other current limiting devices.
[0073] It should be noted that, as Figure 2As shown, a sampling capacitor C4 can also be added between the ground terminal of pin J2 and the CMOD (sampling capacitor input) pin of processor U1. The sampling capacitor C4 is specifically implemented by a 10nF / 10V capacitor. When the instruction input module P1 is implemented using touch buttons, the sampling capacitor C4 can be used to adjust the sensitivity of the touch buttons. The larger the capacitance value of the sampling capacitor C4, the higher the sensitivity; the smaller the capacitance value, the lower the sensitivity. It is recommended that its capacitance value be between 5nF and 30nF.
[0074] It is easy to understand that, considering that the dimming circuit may be set to multiple working modes in practical applications, the MOD1 and MOD2 pins of the processor U1 can be used together as the configuration bits for the output mode. There are 4 modes to choose from based on the different combinations of high and low levels received by the MOD1 and MOD2 pins. Specifically, the MOD1 and MOD2 pins can be led out to the 6-pin dual-row header J3, and then the working mode of the processor U1 can be flexibly configured by using a jumper cap. That is, the MOD1 and MOD2 pins are connected to the jumper cap through the dual-row header J3.
[0075] Specifically, the filtering module can be implemented using two capacitors connected in parallel, which can effectively improve filtering efficiency. The entire circuit has a simple structure, is easy to implement, and uses inexpensive components, which facilitates the simple implementation of the entire dimming circuit.
[0076] Please refer to Figure 4 , Figure 4 A schematic diagram of a power supply circuit provided by this utility model; as an optional embodiment, it further includes:
[0077] The power supply circuit has its input terminal connected to the power supply and its output terminal connected to the power supply terminal of the processor U1 and the second terminal of the indicator LED0, respectively. It is used to convert the power supply into the first power supply voltage required by the processor U1 and the second power supply voltage required by the indicator LED0.
[0078] It is easy to understand that, on the one hand, the power supply voltages required by the processor U1 and the indicator LED0 may differ; on the other hand, in practical applications, the dimming circuit's processor U1 and indicator LED0 generally require lower power supply voltages, which cannot usually be directly met by an external power supply. Therefore, a power supply circuit can be added to perform the power conversion process. The power supply circuit can be directly connected to an external power supply, and then convert the external power supply into the power supply voltage for the processor U1 and the indicator LED0, thereby meeting the power requirements of the dimming circuit. This application does not specifically limit the specific type and implementation method of the power supply circuit, nor does it specifically limit the specific value and implementation method of the external power supply.
[0079] Specifically, by adding a power supply circuit, the power conversion process can be effectively realized. The power supply circuit can directly meet the power requirements of the entire dimming circuit through the power supply, without the need to set up too many external power supplies, saving costs and further reducing the size of the entire dimming circuit.
[0080] As an optional embodiment, the power supply circuit includes:
[0081] The linear regulator U2 has its input terminal Vin connected to the power supply, its output terminal Vout serving as the output terminal of the power supply circuit, and its ground terminal GND grounded. It is used to regulate the power supply to the target voltage.
[0082] The third capacitor C3 has its first end connected to the input terminal of the linear regulator U2 and the power supply, and its second end grounded. It is used to stabilize the voltage output to the input terminal of the linear regulator U2.
[0083] It is understandable that, in order to improve the stability and reliability of the power supply voltage output to the processor U1 and the indicator LED0, a linear regulator U2 is used in the power supply circuit to generate a stable power supply voltage. The target voltage includes the first power supply voltage and the second power supply voltage. This application does not specifically limit the specific type and implementation method of the linear regulator, such as... Figure 3 As shown, a low-dropout linear regulator, AMS111-7-3.3, can be used. This linear regulator can convert an input voltage within the range of 4.75V-12V to the commonly used 3.3V voltage, with low output ripple and a maximum output current of 1A, meeting the circuit requirements. Furthermore, a third capacitor C3 can be added, connected between the input terminal of the linear regulator U2 and the power supply. The third capacitor C3 can further stabilize the input voltage. This application does not specifically limit the specific type and implementation method of the third capacitor C3; it can be implemented using decoupling capacitors or similar methods.
[0084] Specifically, by setting a linear voltage regulator, a stable power supply voltage can be effectively achieved, thereby meeting the power supply requirements of the processor U1 and the LED0 in the dimming circuit. At the same time, a third capacitor C3 can be further set to further ensure the stability and reliability of the final output target voltage.
[0085] As an optional embodiment, the power supply circuit further includes:
[0086] The third current limiting module RX3 has its first terminal grounded.
[0087] The LED1 indicator module has its first terminal as the output terminal of the power supply circuit and connected to the output terminal of the linear regulator U2. Its second terminal is connected to the second terminal of the third current limiting module RX3, and is used to indicate the voltage output status of the power supply circuit.
[0088] It is easy to understand that, to facilitate user observation of the power supply circuit's operation, an indicator module LED1 can be added to the power supply circuit's output terminal. The indicator module LED1 executes different indicator strategies depending on whether the power supply circuit has voltage output or not. Furthermore, to prevent excessive output voltage from causing overcurrent or other abnormalities in the indicator module LED1's operation, a third current-limiting module RX3 connected in series with the indicator module LED1 can be added to limit its operating current and protect it. This application does not specifically limit the specific types and implementation methods of the indicator module LED1 and the third current-limiting module RX3. Figure 3 As shown, the 3V3 power supply is connected to ground through the LED and the current-limiting resistor, which is the third current-limiting module RX3. The LED can indicate whether the voltage is normal.
[0089] Furthermore, a diode D1 for unidirectional conduction can be added to the front end of the linear regulator U2, i.e., the input terminal Vin, to prevent reverse voltage and current. This can also be achieved through other unidirectional conduction modules. Filter capacitors C5 and C6 can also be added to the back end of the linear regulator U2, i.e., the output terminal Vout, for filtering. In addition to the necessary filter capacitors, an LC low-pass filter module including capacitor C7 and inductor L0 can be added to output a cleaner 3V3 power supply. The power supply circuit can be connected to an external power supply through port J1.
[0090] Specifically, by adding a setting prompt module LED1, the current voltage output status of the power supply circuit can be clearly and intuitively informed to the user, so that the user can promptly determine whether the dimming circuit is working properly. This is easy to implement, simple, and effective. At the same time, a third current limiting module RX3 can be set to protect the prompt module LED1, ensuring the safety and reliability of the entire dimming circuit.
[0091] Please refer to Figure 5 , Figure 5 This invention provides a schematic diagram of a dimming device implemented using an integrated chip. To address the aforementioned technical problems, this invention also provides a dimming device, including a dimming object and a dimming circuit as described above, wherein the dimming circuit is connected to the dimming object.
[0092] Understandably, dimming circuits can be implemented on a circuit board using integrated circuits in practical applications. The schematic design of the entire circuit is relatively simple, with a small number of components, and the circuit board can be designed using a simple two-layer board layout. Implementing dimming circuits and devices using integrated chips is simple, inexpensive, readily available, easy to learn, and cost-effective. For layout, you can refer to... Figure 3 As shown, the J1 port at the top of the board serves as the power input port for the external power supply. The input power is converted to 3V3 by the power supply circuit. The middle position contains the touch chip IC—RH6616 and its peripheral components, and the bottom position contains the capacitive touch buttons, which serve as the command input module. This embodiment only provides one specific implementation and layout for the dimming circuit and dimming device. In actual applications, adjustments can be made according to application requirements, and this application does not impose any special limitations. The dimming object is not limited to the indicator light in this application; it can be other light-emitting devices, etc., and this application does not impose any special limitations.
[0093] For a description of the dimming device provided by this utility model, please refer to the above-described embodiment of the dimming circuit; this utility model will not be described in detail here.
[0094] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. 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.
[0095] 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. A dimming circuit, characterized in that, include: The instruction input module is used to output different brightness control signals according to the instructions; The processor has a signal detection terminal connected to the output terminal of the instruction input module, a power supply terminal connected to the first power supply voltage, and a ground terminal grounded. It is used to control the controllable switch to turn on and off according to the frequency corresponding to the brightness control signal. The controllable switch has its control terminal connected to the output terminal of the processor, its first terminal connected to the first terminal of the indicator light, and its second terminal grounded.
2. The dimming circuit of claim 1, wherein, Also includes: The first resistor has its first end connected to the signal detection terminal of the processor and its second end connected to the output terminal of the instruction input module, and is used to stably output the brightness control signal to the processor.
3. The dimming circuit of claim 1, wherein, Also includes: The first current limiting module has its first terminal connected to the second power supply voltage and its second terminal connected to the second terminal of the indicator light.
4. The dimming circuit of claim 1, wherein, Also includes: The second current limiting module has its first end connected to the output end of the processor and its second end connected to the control end of the controllable switch.
5. The dimming circuit of claim 1, wherein, Also includes: The filtering module has a first terminal connected to the first power supply voltage and connected to the power supply terminal of the processor, and a second terminal grounded.
6. The dimming circuit of claim 5, wherein, The filtering module includes: The first capacitor has its first terminal grounded. The second capacitor has a first terminal grounded and a second terminal connected to the first power supply voltage, and is connected to the second terminal of the first capacitor and the power supply terminal of the processor, respectively.
7. The dimming circuit of any one of claims 1 to 6, wherein, Also includes: The power supply circuit has an input terminal connected to the power supply and an output terminal connected to the power supply terminal of the processor and the second terminal of the indicator light, respectively, for converting the power supply into a first power supply voltage required by the processor and a second power supply voltage required by the indicator light.
8. The dimming circuit of claim 7, wherein, The power supply circuit includes: A linear regulator, with its input terminal connected to the power supply, its output terminal serving as the output terminal of the power circuit, and its ground terminal grounded, is used to regulate the power supply to the target voltage. The third capacitor has its first end connected to the input terminal of the linear regulator and the power supply, and its second end grounded, and is used to stabilize the voltage output to the input terminal of the linear regulator.
9. The dimming circuit of claim 8, wherein, The power supply circuit also includes: The third current limiting module has its first terminal grounded. The prompting module has a first terminal serving as the output terminal of the power supply circuit and connected to the output terminal of the linear regulator, and a second terminal connected to the second terminal of the third current limiting module, used to indicate the voltage output status of the power supply circuit.
10. A dimming device, characterized by It includes a dimming object and a dimming circuit as described in any one of claims 1 to 9, wherein the dimming circuit is connected to the dimming object.