Single-loop lighting control method, circuit and lighting equipment
By using NMOS transistors and frequency modulation digital coding technology in single-circuit lighting equipment to generate PWM signals to drive the lighting module, the problem of limited functionality in single-circuit lighting equipment is solved, and rich lighting control and efficient power transmission are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-24
- Publication Date
- 2026-03-13
AI Technical Summary
Existing DC-powered single-circuit lighting equipment is difficult to achieve rich lighting functions, such as multiple lighting modes, brightness adjustment and color temperature control, and requires an additional circuit to transmit complex control signals.
The control signal is transmitted in a single loop using NMOS transistors and frequency modulation digital encoding technology. The control signal is modulated to generate a PWM signal, which drives the NMOS transistor to work. After demodulation, the signal controls the lighting module, thus realizing a variety of lighting functions.
Without adding extra circuits, multiple lighting functions can be controlled, improving ease of use and energy efficiency, and simplifying the circuit structure.
Smart Images
Figure CN121665411A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of lighting technology, and in particular to a single-loop lighting control method, circuit, and lighting equipment. Background Technology
[0002] In DC-powered single-loop lighting equipment, series switches are currently commonly used for lighting control. In the single-loop lighting control circuit, the control switch, which enables function switching and brightness adjustment, is connected to the drive circuit module. However, the series-connected control switch in the single loop only functions to turn the lamp on and off. A very small number of lighting equipment use a series-connected control switch in the single loop to momentarily switch between several brightness levels, but this does not allow direct adjustment of lighting modes, brightness, color temperature, or other functional modes using the series-connected switch in the single loop. To achieve multiple lighting functions, a separate loop is needed for transmitting complex lighting control signals.
[0003] Therefore, existing lighting equipment struggles to achieve a wide range of lighting functions within a single-loop lighting control circuit. Summary of the Invention
[0004] This invention provides a single-loop lighting control method, circuit, and lighting device to solve the problem that existing lighting devices cannot achieve rich lighting functions in a single-loop lighting control circuit.
[0005] This invention discloses a single-loop lighting control method applied in a single-loop lighting control circuit. The single-loop lighting control circuit includes a control circuit module, a drive circuit module, a power supply module, and a lighting module. The control circuit module and the drive circuit module are connected in series and positioned between the positive and negative terminals of the power supply module. The control circuit module includes an NMOS transistor, the source of which is connected to the negative terminal of the power supply module, and its drain is connected to the drive circuit unit. The single-loop lighting control method includes: The system acquires input control signals, processes the input control signals through frequency modulation digital encoding to generate modulation control signals, and then outputs PWM signals corresponding to the modulation control signals. The PWM signal is used to drive the NMOS transistor to transmit the modulation control signal and power supply to the drive circuit module. The driving circuit module demodulates the modulation control signal transmitted by the switching action of the NMOS transistor to obtain a lighting control signal, and drives the lighting module to work based on the lighting control signal.
[0006] Optionally, the duty cycle of the PWM signal corresponding to the modulation control signal is greater than 99%.
[0007] Optionally, the frequency of the modulation control signal for: , For the center frequency, This is frequency offset.
[0008] Optionally, the single-loop lighting control method further includes: Based on the current operating state and the type of the input control signal, an operating state switch is performed; wherein, the specific steps of the operating state switch include: In the power-off state, if the input control signal is a power-on wake-up signal, the power-on wake-up signal is processed by frequency modulation digital encoding to generate a first modulation control signal, and a first PWM signal corresponding to the first modulation control signal is output. The frequency of the first modulation control signal is the center frequency. ; The NMOS transistor is driven to operate using the first PWM signal; After the first modulation control signal is demodulated by the driving circuit module, the lighting module is driven to work in the working mode before power-off.
[0009] Optionally, the specific steps for switching the working state may further include: In the power-on state, if the input control signal is a power-off signal, the power-off signal is processed by frequency modulation digital encoding to generate a second modulation control signal, and a second PWM signal corresponding to the second modulation control signal is output. The NMOS transistor is driven to operate using the second PWM signal; After the driving circuit module demodulates the second modulation control signal, it saves the current working mode and then controls the lighting module to turn off.
[0010] Optionally, the specific steps for switching the working state may further include: When the device is powered on, if the input control signal is a stepless adjustment signal, the stepless adjustment signal is processed by frequency modulation digital encoding to generate a third modulation control signal, and a third PWM signal corresponding to the third modulation control signal is output. The NMOS transistor is driven by the third PWM signal. After the driving circuit module demodulates the third modulation control signal, it controls and adjusts the lighting brightness or color temperature of the lighting module.
[0011] The present invention also discloses a single-loop lighting control circuit for implementing the single-loop lighting control method as described in any of the above claims. The single-loop lighting control circuit includes a control circuit module, a drive circuit module, a power supply module, and a lighting module. The control circuit module and the drive circuit module are connected in series between the positive and negative terminals of the power supply module. The control circuit module includes an NMOS transistor, the source of which is connected to the negative terminal of the power supply module, and its drain is connected to the drive circuit unit.
[0012] Optionally, the control circuit module further includes a first control unit, a first energy storage capacitor, and multiple control switches; the gate of the NMOS transistor is connected to the first control unit, its source is connected to the negative terminal of the power supply module, and its drain is connected to the positive terminal of the first energy storage capacitor; the first energy storage capacitor is connected in parallel between the power supply terminal of the first control unit and the negative terminal of the power supply module. The drive circuit module includes a second control unit, a power drive unit, a second energy storage capacitor, and a first inductor; the first inductor is connected in series between the drain of the NMOS transistor and the negative terminal of the second energy storage capacitor; the second energy storage capacitor is connected in parallel between the power supply terminal of the second control unit and the positive terminal of the power module; the second control unit is connected to the drain of the NMOS transistor and the power drive unit; The first control unit is used to acquire the input control signals of each control switch, generate a modulation control signal by frequency modulation digital encoding of the input control signals, and then output a PWM signal corresponding to the modulation control signal to drive the NMOS transistor to work; the second control unit is used to demodulate the modulation control signal transmitted by the switching action of the NMOS transistor to obtain a lighting control signal; the power drive unit drives the lighting module to work according to the lighting control signal.
[0013] Optionally, the driving circuit module further includes a coupling capacitor, one end of which is connected to the drain of the NMOS transistor and the other end of which is connected to the second control unit; the driving circuit module further includes a first resistor, one end of which is connected to the drain of the NMOS transistor and the other end of which is connected to the positive terminal of the power supply module.
[0014] The present invention also discloses a lighting device, including a single-loop lighting control circuit as described in any of the preceding claims.
[0015] The beneficial effects of the single-loop lighting control method, circuit, and lighting equipment provided in this invention are as follows: By generating a modulation control signal through frequency modulation digital encoding of the input control signal generated by user operation, and then outputting a PWM signal corresponding to the modulation control signal to drive an NMOS transistor, the modulation control signal and power supply energy are transmitted to the drive circuit module in a single loop formed by the control circuit module, drive circuit module, and power supply module connected in series. The drive circuit module can control the lighting module to achieve different lighting functions according to different lighting control signals corresponding to different input control signals. This application does not require adding a separate loop for transmission of complex lighting control signals, and can also achieve rich lighting functions. Attached Figure Description
[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a schematic flowchart of the single-loop lighting control method provided in an embodiment of the present invention; Figure 2 This is a circuit diagram of a single-loop lighting control circuit provided in an embodiment of the present invention; Figure 3 This is a circuit diagram of the buck-boost constant current drive circuit provided in an embodiment of the present invention; Figure 4 This is a structural block diagram of a lighting device according to an embodiment of the present invention.
[0017] The labels for the attached figures are as follows: 100. Single-loop lighting control circuit; 10. Control circuit module; 11. First control unit; 12. Control switch; 13. Anti-backflow unit; 20. Drive circuit module; 21. Second control unit; 22. Power drive unit; 221. Buck-boost constant current drive circuit; 30. Power supply module; 40. Lighting module; Q1, NMOS transistor; C1, first energy storage capacitor; C2, second energy storage capacitor; C3, coupling capacitor; L1, first inductor; R1, first resistor; L2, wire; D1, diode; LD1, lighting lamp; SW1, mode switch; SW2, start / stop switch; SW3, analog signal adjustment switch; U1, buck-boost converter chip; L3, second inductor; U2, amplifier; C4, first filter capacitor; C5, second filter capacitor; C6, third filter capacitor; C7, fourth filter capacitor; C8, fifth filter capacitor; C9, sixth filter capacitor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; 200. Lighting equipment. Detailed Implementation
[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0019] This invention provides a single-loop lighting control method, such as... Figure 1 and Figure 2 As shown, the single-loop lighting control method is applied in a single-loop lighting control circuit 100, which includes a control circuit module 10, a drive circuit module 20, a power supply module 30, and a lighting module 40. The control circuit module 10 and the drive circuit module 20 are connected in series and positioned between the positive and negative terminals of the power supply module 30. The control circuit module 10 includes an NMOS transistor Q1, the source of which is connected to the negative terminal of the power supply module 30, and its drain is connected to the drive circuit unit.
[0020] like Figure 1 and Figure 2 As shown, the single-loop lighting control method includes: S110. Acquire the input control signal, process the input control signal through frequency modulation digital encoding to generate a modulation control signal, and then output the PWM signal corresponding to the modulation control signal. S120: The NMOS transistor Q1 is driven by a PWM signal to transmit the modulation control signal and power supply to the drive circuit module 20. S130. The modulation control signal transmitted by the switching action of NMOS transistor Q1 is demodulated by the driving circuit module 20 to obtain the lighting control signal, and the lighting module 40 is driven to work based on the lighting control signal.
[0021] The single-loop lighting control method of this application generates a modulation control signal by processing the input control signal generated by the user operation through frequency modulation digital encoding, and then outputs a PWM signal corresponding to the modulation control signal to drive the NMOS transistor Q1. By utilizing the operation of the NMOS transistor Q1, the modulation control signal and the power supply energy are transmitted to the drive circuit module 20 in a single loop formed by the control circuit module 10, the drive circuit module 20 and the power supply module 30 connected in series. The drive circuit module 20 can control the lighting module 40 to achieve different lighting functions according to different lighting control signals corresponding to different input control signals. This application does not require adding a separate loop for the transmission of complex lighting control signals, and can also achieve rich lighting functions.
[0022] In step S110, the input control signals triggered by user operations are first collected, such as mode switching signals, power-on signals, power-off signals, and lighting brightness adjustments. Then, using frequency modulation (FM) digital encoding, the input control signals are converted into modulated control signals that carry control information through frequency changes. Based on the frequency of this modulated control signal, a corresponding PWM signal is generated. For example, depending on the input control signal, the frequency of a preset base clock signal is changed to generate a corresponding modulated control signal. This modulated control signal is then converted into a corresponding PWM signal to drive the NMOS transistor Q1. Using frequency modulation for signal modulation is simple, easy to demodulate, and can be handled by low-cost circuits. In this way, different types of input control signals correspond to different modulated control signals and different PWM signals.
[0023] In step S120, the PWM signal acts on the gate of NMOS transistor Q1, controlling it to repeatedly turn on and off. During this process, on one hand, the power supplied by the power module 30 is transmitted to the drive circuit module 20 through the conduction of NMOS transistor Q1; on the other hand, the switching frequency of NMOS transistor Q1 corresponds to the frequency of the previously generated modulation control signal, effectively attaching the frequency modulation control signal to the power transmission process and transmitting it together to the drive circuit module 20. Therefore, through the operation of NMOS transistor Q1, the frequency modulation control signal and the power supplied can be transmitted together to the drive circuit module 20 in a single loop formed by the control circuit module 10, drive circuit module 20, and power module 30 connected in series.
[0024] In step S130, the drive circuit module 20 detects the frequency of the NMOS transistor Q1 switching action, demodulates the modulation control signal corresponding to this frequency, restores it to the lighting control signal, and then controls the lighting module 40 to work according to this lighting control signal, such as turning on, turning off, adjusting the lighting brightness, or switching modes.
[0025] In an optional embodiment of this application, the duty cycle of the PWM signal corresponding to the modulation control signal is greater than 99%. Specifically, a duty cycle of PWM signal greater than 99% means that NMOS transistor Q1 is in the conducting state for almost the entire PWM cycle, with only a very short time off. In this state, the power of power module 30 can be transmitted to drive circuit module 20 with almost no loss, maximizing the utilization of power of power module 30, reducing power loss caused by the cutoff of NMOS transistor Q1, maintaining high-efficiency power transmission and stable power supply to single-loop control circuit module 10.
[0026] In an optional embodiment of this application, the frequency of the modulation control signal for: , For the center frequency, Frequency offset. Fixed center frequency. This provides a clear reference for demodulation of the drive circuit module 20, which only needs to... Identify frequency variations of the signal within the core range; while limiting the frequency offset. This clarifies the frequency range of the modulation control signal, preventing frequency fluctuations from exceeding the circuit's identifiable range. It also avoids frequency overlap with interference signals generated by other components in the circuit, reducing the probability of misidentification during demodulation.
[0027] In an optional embodiment of this application, the single-loop lighting control method further includes: Based on the current operating status and the type of input control signal, a switching operation status is performed; the specific steps of the operating status switching include: In the power-off state, if the input control signal is a power-on wake-up signal, the power-on wake-up signal is processed by frequency modulation digital encoding to generate a first modulation control signal, and a first PWM signal corresponding to the first modulation control signal is output. The frequency of the first modulation control signal is the center frequency. The NMOS transistor Q1 is driven to operate using the first PWM signal; After the first modulation control signal is demodulated by the drive circuit module 20, the lighting module 40 is driven to work in the working mode before shutdown.
[0028] Specifically, the first PWM signal corresponding to the first modulation control signal generated by the power-on wake-up signal drives the NMOS transistor Q1 to work. The switching action of the NMOS transistor Q1 carries the first frequency modulation control signal. The frequency of the first modulation control signal corresponding to the power-on wake-up signal is set to the aforementioned center frequency. Other input control signals (such as brightness adjustment, mode switching, etc.) are adjusted for frequency deviation based on the center frequency. The drive circuit module 20 only needs to use the center frequency as a fixed reference and identify frequency changes within a certain range. It does not need to adapt to multiple unrelated frequency references, significantly reducing the probability of misjudgment during demodulation and improving the accuracy of signal recognition. After the drive circuit module 20 demodulates and identifies the first modulation control signal, it will call the previously stored lighting operating mode parameters before power-off, such as the previous brightness and lighting mode, and directly control the lighting module 40 to start according to these lighting operating mode parameters. This eliminates the need for user resetting, improving ease of use.
[0029] In an optional embodiment of this application, the specific steps for switching working states further include: When the device is powered on, if the input control signal is a power-off signal, the power-off signal is processed by frequency modulation digital encoding to generate a second modulation control signal, and a second PWM signal corresponding to the second modulation control signal is output. The NMOS transistor Q1 is driven by the second PWM signal; After the second modulation control signal is demodulated by the drive circuit module 20, the current working mode is saved and the lighting module 40 is turned off.
[0030] Specifically, the frequency of the second modulation control signal is a pre-set frequency corresponding to the power-off signal. This frequency is obtained by adjusting the center frequency of the first modulation control signal corresponding to the power-on wake-up signal, and then generating the corresponding second PWM signal. The second PWM signal can drive the NMOS transistor Q1 and also carries the power-off control information. The driver circuit module 20 demodulates the second modulation control signal and then executes the corresponding power-off operation. During the power-off operation, the current operating mode is saved before powering off, so that the saved operating mode parameters can be recalled after power-on, achieving the effect of remembering start and stop.
[0031] In an optional embodiment of this application, the specific steps for switching working states further include: When the device is powered on, if the input control signal is a stepless adjustment signal, the stepless adjustment signal will be processed by frequency modulation digital encoding to generate a third modulation control signal, and a third PWM signal corresponding to the third modulation control signal will be output. The NMOS transistor Q1 is driven by a third PWM signal. After the third modulation control signal is demodulated by the drive circuit module 20, the lighting brightness or color temperature of the lighting module 40 is controlled and adjusted.
[0032] Specifically, the frequency of the third modulation control signal is also a pre-set frequency corresponding to the stepless adjustment signal. This dedicated frequency is obtained by adjusting the center frequency of the first modulation control signal corresponding to the power-on wake-up signal, and then generating the third PWM signal accordingly. The third PWM signal can drive the NMOS transistor Q1 and also carry the control information for stepless adjustment. After the drive circuit module 20 demodulates the third modulation control signal, it executes the corresponding stepless adjustment operation, thereby realizing the stepless adjustment of the lighting brightness or color temperature.
[0033] In an optional embodiment of this application, the working state switching step further includes: When the device is powered on, if the input control signal is a mode switching signal, the mode switching signal will be processed by frequency modulation digital encoding to generate a fourth modulation control signal, and the fourth PWM signal corresponding to the fourth modulation control signal will be output. The NMOS transistor Q1 is driven by the fourth PWM signal; After the fourth modulation control signal is demodulated by the drive circuit module 20, the lighting adjustment module 40 is controlled to switch modes.
[0034] Specifically, the frequency of the fourth modulation control signal is also a pre-set frequency corresponding to the mode switching signal. This frequency is obtained by adjusting the center frequency of the first modulation control signal corresponding to the power-on wake-up signal, and then generating the fourth PWM signal. The fourth PWM signal can drive the NMOS transistor Q1 and also carry the control information for mode switching. After the driver circuit module 20 demodulates the fourth modulation control signal, it performs mode switching, allowing the user to select the appropriate operating mode according to their preference.
[0035] This application embodiment also provides a single-loop lighting control circuit 100 for implementing the single-loop lighting control method as described above. The single-loop lighting control circuit 100 includes a control circuit module 10, a drive circuit module 20, a power supply module 30, and a lighting module 40. The control circuit module 10 and the drive circuit module 20 are connected in series between the positive and negative terminals of the power supply module 30. The control circuit module 10 includes an NMOS transistor Q1, the source of which is connected to the negative terminal of the power supply module 30, and its drain is connected to the drive circuit unit.
[0036] The single-loop lighting control circuit 100 applies the above-mentioned single-loop lighting control method. In the single loop formed by the control circuit module 10, the drive circuit module 20 and the power supply module 30 connected in series, it can simultaneously transmit power supply and frequency modulation control signals. There is no need to add a separate loop for the transmission of complex lighting control signals, and it can also realize a variety of lighting functions.
[0037] In optional embodiments of this application, such as Figure 2As shown, the control circuit module 10 also includes a first control unit 11, a first energy storage capacitor C1, and multiple control switches 12; the gate of the NMOS transistor Q1 is connected to the first control unit 11, its source is connected to the negative terminal of the power supply module 30, and its drain is connected to the positive terminal of the first energy storage capacitor C1; the first energy storage capacitor C1 is connected in parallel between the power supply terminal of the first control unit 11 and the negative terminal of the power supply module 30; the drive circuit module 20 includes a second control unit 21, a power drive unit 22, a second energy storage capacitor C2, and a first inductor L1; the first inductor L1 is connected in series between the drain of the NMOS transistor Q1 and the negative terminal of the second energy storage capacitor C2; the second energy storage capacitor C2 is connected in parallel. Between the power supply terminal of the second control unit 21 and the positive terminal of the power module 30; the second control unit 21 is connected to the drain of the NMOS transistor Q1 and the power drive unit 22; wherein, the first control unit 11 is used to collect the input control signals of each control switch 12, generate a modulation control signal by frequency modulation digital encoding of the input control signals, and then output a PWM signal corresponding to the modulation control signal to drive the NMOS transistor Q1 to work; the second control unit 21 is used to demodulate the modulation control signal transmitted by the switching action of the NMOS transistor Q1 to obtain the lighting control signal; the power drive unit 22 drives the lighting module 40 to work according to the lighting control signal.
[0038] In the control circuit module 10, the first control unit 11 acquires the input control signals of each control switch 12, converts the input control signals into frequency modulation control signals through frequency modulation digital encoding processing, and outputs a PWM signal corresponding to the frequency modulation control signal to drive the NMOS transistor Q1 to work; in the drive circuit module 20, the second control unit 21 generates a lighting control signal based on the frequency modulation control signal transmitted by the switching action of the NMOS transistor Q1, and the power drive unit 22 drives the lighting to work according to the lighting control signal; in terms of power supply, the first control unit 11 of the control circuit module 10 uses the first energy storage capacitor C1 and NMOS transistor Q1 to power the lighting. The chopper boost circuit formed by the NMOS transistor Q1 and the first inductor L1 is powered. The second control unit 21 and the power drive unit 22 of the drive circuit module 20 are powered by filtering the PWM power supply transmitted by the NMOS transistor Q1 through the first inductor L1 and the second energy storage capacitor C2 to form a smooth DC power supply. Therefore, in this application, the control circuit module 10 and the drive circuit module 20 can be placed separately in a single-loop topology. The control circuit module 10, which can be connected in series in a single loop, can be equipped with multiple control switches 12 to trigger different input control signals for controlling different lighting functions, thus enriching the lighting functions. The control circuit module 10 and the drive circuit module 20 of the lighting module 40 can be placed separately and connected through a single loop for convenient use.
[0039] The NMOS transistor Q1 can supply power to the drive circuit module 20 and send frequency modulation control signals under the drive of the PWM signal, i.e., in a high duty cycle chopper conduction state. In a specific embodiment, the PWM signal of the NMOS transistor Q1 adopts a high duty cycle conduction of more than 99%, maintaining high-efficiency power transmission and stable power supply to the single-loop control circuit module 10. In the above circuit, the NMOS transistor Q1 simultaneously constitutes three functions: single-loop control switch 12, modulation transistor for input control signals, and boost circuit chopper switch of the control circuit module 10. It simultaneously undertakes the triple core functions of "control switch 12 + modulation transistor + boost circuit chopper switch" in the circuit, greatly simplifying the circuit structure with "one transistor for multiple uses". Through functional reuse, the number of components is reduced, and complex functions are realized in a simplified circuit.
[0040] The first control unit 11 acquires the input control signals from each control switch 12, converts them into frequency modulation (FM) control signals, and outputs corresponding PWM signals based on these FM control signals. Specifically, the input control signals serve as modulation signals. After acquiring the input control signals, the first control chip changes the frequency of a preset base clock signal according to the different input control signals to generate corresponding modulation control signals. These modulation control signals are then converted into corresponding PWM signals to drive the NMOS transistor Q1. In the second control unit 21, upon receiving the modulation control signals, it only needs to detect the signal frequency change caused by the switching action of the NMOS transistor Q1 to reconstruct the input control signals and generate the lighting control signals. Frequency modulation is used for signal modulation, which is simple, easy to demodulate, and can be handled by low-cost circuits. Both the first control unit 11 and the second control unit 21 can be implemented using existing MCU chips.
[0041] When NMOS transistor Q1 is working, it transmits frequency modulation control signals and PWM power supply. The power module 30, NMOS transistor Q1, first inductor L1 and second energy storage capacitor C2 form a loop to supply power to the second control unit 21 and the power drive unit 22. The chopper boost circuit composed of the first energy storage capacitor C1, NMOS transistor Q1 and first inductor L1 supplies power to the first control unit 11, so that the control circuit module 10 can still work stably under single-loop connection.
[0042] The number of control switches 12 can be two, three, four, or more. For example, the control circuit module 10 is provided with three control switches 12.
[0043] The power drive unit 22 is used to generate a high-power drive current to control the operation of the lighting module 40.
[0044] refer to Figure 2In an optional embodiment of this application, the driving circuit module 20 further includes a coupling capacitor C3, one end of which is connected to the drain of the NMOS transistor Q1, and the other end is connected to the second control unit 21.
[0045] Specifically, the basic characteristic of coupling capacitor C3 is that it allows AC while blocking DC. In the circuit described above, NMOS transistor Q1 simultaneously transmits both the frequency modulation control signal and the PWM power supply signal. Coupling capacitor C3 isolates the DC component, allowing only the AC frequency modulation control signal to be transmitted to the second control unit 21, thus preventing DC voltage from interfering with or damaging the signal acquisition section of the second control unit 21. The capacitance value of coupling capacitor C3 can be selected as needed, allowing only AC signals within a specific frequency range to pass through, filtering out other noise interference signals in the circuit, and ensuring the accuracy of the signal transmitted to the second control unit 21. By setting coupling capacitor C3, the frequency modulation control signal is coupled and transmitted to the second control unit 21 without the need for an additional independent signal transmission line. The signal transmission can be achieved on the original power supply circuit simply by utilizing the AC-passing and DC-blocking characteristics of coupling capacitor C3 itself, simplifying the circuit structure.
[0046] The first inductor L1 and the second energy storage capacitor C2 form a power supply LC filter network. The first inductor L1, the first energy storage capacitor C1, and the NMOS transistor Q1 form an energy storage boost circuit to power the first control unit 11. The first inductor L1 and the coupling capacitor C3 form a low-pass filter network to transmit frequency modulation signals to the second control unit 21. Through the triple network of "power supply LC filtering + energy storage boost + low-pass filtering", complex functions such as "power purification, energy boost, and signal filtering" are achieved simultaneously. The complex functions are realized by the collaboration of multiple devices. Through "network collaboration", redundant circuits are reduced.
[0047] refer to Figure 2 In an optional embodiment of this application, the driving circuit module 20 further includes a first resistor R1, one end of which is connected to the drain of the NMOS transistor Q1, and the other end is connected to the positive terminal of the power supply module 30.
[0048] Specifically, the first energy storage capacitor C1, together with the first resistor R1 and the power module 30, constructs an independent and stable small power supply loop for the first control unit 11. The first energy storage capacitor C1 first completes energy storage, and then continuously supplies power to the first control unit 11 through the first resistor R1. The first resistor R1 limits the current of this small power supply loop, preventing the energy of the first energy storage capacitor C1 from being rapidly consumed. This small power supply loop is independent of the power supply path of the drive circuit module 20, so even if the second control unit 21 is turned off and enters a low-power state, it will not affect the power supply stability of the first control unit 11, ensuring that the first control unit 11 can collect input control signals when the control switch 12 is triggered, and the first control unit 11 enters a sleep state. Therefore, by setting the first resistor R1, when lighting adjustment is not required, the second control unit 21 enters a low-power state, at which time the energy consumption of the entire drive circuit module 20 is greatly reduced, while the first control unit 11 continues to work normally to collect input control signals from the control switch 12. This can effectively save the power of the power module 30 and improve the battery life of the entire single-loop lighting control circuit 100.
[0049] refer to Figure 2 In an optional embodiment of this application, the drain of NMOS transistor Q1 is connected to the first inductor L1 via wire L2.
[0050] Specifically, the drain of NMOS transistor Q1 is the transmission node for the frequency modulation control signal and the energy stored / released by the first inductor L1. Directly connecting the drain of NMOS transistor Q1 to the first inductor L1 with wire L2 can minimize signal and energy loss during transmission, allowing the first inductor L1 to more efficiently receive the energy changes caused by the switching action of NMOS transistor Q1, while also ensuring that the frequency modulation control signal is transmitted more completely to the second control unit 21. Due to the inherent physical characteristics of wire L2, parasitic inductance will be generated during operation, transmitting power and sending the frequency modulation control signal.
[0051] refer to Figure 2 In an optional embodiment of this application, the single-loop lighting control circuit 100 further includes an anti-backflow unit 13, which is located between the power supply terminal of the first control unit 11 and the first inductor L1 to prevent current backflow.
[0052] Specifically, the power supply terminal of the first control unit 11 may generate reverse current due to internal circuit fluctuations. By setting up the anti-reverse current unit 13, the generated reverse current can be prevented from flowing to the drain of the first inductor L1 and the NMOS transistor Q1, thereby preventing the reverse current from flowing to the power supply module 30 and ensuring the normal power supply of the control circuit module 10 and the drive circuit module 20.
[0053] refer to Figure 2 In an optional embodiment of this application, the anti-backflow unit 13 includes a diode D1. The negative terminal of the diode D1 is connected to the power supply terminal of the first control unit 11, and the positive terminal is connected to one end of the first inductor L1 and the drain of the NMOS transistor Q1.
[0054] Specifically, diode D1 exhibits unidirectional conductivity. The cathode of diode D1 is connected to the power supply terminal of the first control unit 11, while the anode is connected to the drain of the first inductor L1 and the NMOS transistor Q1. It only allows forward current to flow from the first inductor L1 and the drain of the NMOS transistor Q1 to the power supply terminal of the first control unit 11, completely blocking reverse current flow and precisely solving the problem of reverse current flow. Diode D1 is a low-cost, small-size electronic component that requires no additional control logic and can operate directly by connecting it to existing circuit paths, resulting in a simple circuit structure.
[0055] refer to Figure 2 and Figure 3 In an optional embodiment of this application, the lighting module 40 includes a plurality of lighting lamps LD1; the power drive unit 22 includes a plurality of step-up and step-down constant current drive circuits 221 connected to the second control unit 21, the step-up and step-down constant current drive circuits 221 are configured to correspond one-to-one with the lighting lamps LD1, and the step-up and step-down constant current drive circuits 221 are used to drive the lighting lamps LD1 based on the lighting control signal.
[0056] Specifically, by setting up multiple lighting lamps LD1, the step-up and step-down constant current drive circuit 221 can adjust the drive current based on the lighting control signal to control the switching, brightness, color temperature and other functions of the lighting lamps LD1, thereby realizing multiple lighting modes and adapting to more usage scenarios.
[0057] In a specific embodiment, the multiple lighting lamps LD1 may include a combination of various lighting effects such as cool color temperature white light lamps, warm color temperature white light lamps, and red, green and blue mixed light lamps.
[0058] refer to Figure 2 and Figure 3In an optional embodiment of this application, the buck-boost constant current drive circuit 221 includes a buck-boost chip U1, a second inductor L3, an amplifier U2, a first filter capacitor C4, a second filter capacitor C5, a third filter capacitor C6, a fourth filter capacitor C7, a fifth filter capacitor C8, a sixth filter capacitor C9, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The voltage input terminal of the buck-boost chip U1 is connected to the positive terminal of the power supply module 30, its enable terminal is connected to its own input terminal, and its voltage output terminal is connected to the positive terminal of the lighting lamp LD1. The first filter capacitor C4 and the second filter capacitor C5 are connected in parallel between the voltage input terminal of the buck-boost chip U1 and the negative terminal of the second energy storage capacitor C2. The third filter capacitor C6 and the fourth filter capacitor C7 are connected in parallel between the buck-boost chip U1 and the second energy storage capacitor C2. The voltage output terminal of U1 is connected to the negative terminal of the second energy storage capacitor C2; the second resistor R2 and the third resistor R3 are connected in series between the second control unit 21 and the negative input terminal of the amplifier U2, and their series connection node is connected to one end of the fifth filter capacitor C8; the other end of the fifth filter capacitor C8 is connected to the negative terminal of the second energy storage capacitor C2; one end of the fourth resistor R4 is connected to the negative input terminal of the amplifier U2, and the other end is connected to the negative terminal of the second energy storage capacitor C2; one end of the fifth resistor R5 is connected to the negative terminal of the second energy storage capacitor C2, and the other end is connected to the negative terminal of the lighting lamp LD1 and the positive input terminal of the amplifier U2; the output terminal of the amplifier U2 is connected to the feedback input terminal of the buck-boost chip U1, its positive power supply terminal is connected to the positive terminal of the first energy storage capacitor C1, and its negative power supply terminal is connected to the negative terminal of the second energy storage capacitor C2.
[0059] like Figure 2 and Figure 3 As shown, Figure 3 The VIN port power supply is connected to the positive terminal of the drive circuit module 20, which is also the positive terminal of the power supply module 30. The GND port power supply is connected to the negative terminal of the drive circuit module 20, which is also the negative terminal of the second energy storage capacitor C2. The PWM port is connected to the second control unit 21 to receive the lighting control signal from the second unit, which is the PWM port signal. The LD+ and LD- ports are connected to the lighting lamp LD1, with the LD+ port being the positive terminal of the lighting lamp LD1 and the LD- port being the negative terminal of the lighting lamp LD1. The buck-boost chip U1 is a high-power buck-boost chip U1. The amplifier U2 is a rail-to-rail precision amplifier U2. The second inductor L3 is used for buck-boost energy storage filtering. The first filter capacitor C4 and the second filter capacitor C5 are used to filter the voltage input terminal of the buck-boost chip U1. The third filter capacitor C6 and the fourth filter capacitor C7 are used to filter the voltage output terminal of the buck-boost chip U1. The fifth resistor R5 is used to sample the drive current of the lighting lamp LD1. The fifth filter capacitor C8, the sixth filter capacitor C9, the second resistor R2, the third resistor R3, and the fourth resistor R4 constitute a second-order low-pass filter network.
[0060] Specifically, the lighting control signal received by the PWM port is used to control the drive current of the lighting lamp LD1. After being filtered by a second-order low-pass filter network consisting of the fifth filter capacitor C8, the sixth filter capacitor C9, the second resistor R2, the third resistor R3, and the fourth resistor R4, the lighting control signal generates a smooth current reference signal, which is input to the negative input terminal of amplifier U2. The voltage value of the current reference signal at the negative input terminal of amplifier U2 changes with the duty cycle of the PWM port signal. The current reference signal is compared with the drive current signal sampled by the fifth resistor R5, and amplified to obtain a current error signal. The current error signal output by amplifier U2 is sent to the feedback input terminal of buck-boost chip U1. Buck-boost chip U1 performs buck-boost control based on the signal at the feedback input terminal, thereby enabling the drive current of the LD+ and LD- ports to follow the change in the duty cycle of the PWM port signal, achieving precise control of the brightness of the lighting lamp LD1.
[0061] refer to Figure 2 In an optional embodiment of this application, the plurality of control switches 12 include a mode switching switch SW1, a start / stop switch SW2, and an analog quantity adjustment switch SW3, all of which are connected to the first control unit 11.
[0062] Specifically, the mode switching switch SW1 is used to control switching between different lighting modes. The start / stop switch SW2 is used to control the lighting to turn on and off. The analog quantity adjustment switch SW3 is used for stepless adjustment of lighting drive parameters, such as adjusting the brightness or color temperature of the lighting lamp LD1. The first control unit 11 collects the input control signals from the mode switching switch SW1, the start / stop switch SW2, and the analog quantity adjustment switch SW3, outputs the corresponding frequency modulation control signal, and sends it to the second control unit 21. The second control unit 21 demodulates the signal and controls the corresponding lighting lamp LD1 to operate.
[0063] This application also provides a lighting device 200, including the single-loop lighting control circuit 100 as described above. The lighting device 200 includes the same circuit structure and beneficial effects as the single-loop lighting control circuit 100 in the foregoing embodiments. The circuit structure and beneficial effects of the single-loop lighting control circuit 100 have been described in detail in the foregoing embodiments and will not be repeated here.
[0064] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of the present invention.
Claims
1. A single-loop lighting control method, characterized in that, This invention relates to a single-loop lighting control circuit, comprising a control circuit module, a drive circuit module, a power supply module, and a lighting module. The control circuit module is connected in series with the drive circuit module and positioned between the positive and negative terminals of the power supply module. The control circuit module includes an NMOS transistor, with its source connected to the negative terminal of the power supply module and its drain connected to the drive circuit unit. The single-loop lighting control method includes: The system acquires input control signals, processes the input control signals through frequency modulation digital encoding to generate modulation control signals, and then outputs PWM signals corresponding to the modulation control signals. The PWM signal is used to drive the NMOS transistor to transmit the modulation control signal and power supply to the drive circuit module. The driving circuit module demodulates the modulation control signal transmitted by the switching action of the NMOS transistor to obtain a lighting control signal, and drives the lighting module to work based on the lighting control signal.
2. The single-loop lighting control method according to claim 1, characterized in that, The duty cycle of the PWM signal corresponding to the modulation control signal is greater than 99%.
3. The single-loop lighting control method according to claim 1, characterized in that, The frequency of the modulation control signal for: , For the center frequency, This is frequency offset.
4. The single-loop lighting control method according to claim 3, characterized in that, The single-loop lighting control method further includes: Based on the current operating state and the type of the input control signal, an operating state switch is performed; wherein, the specific steps of the operating state switch include: In the power-off state, if the input control signal is a power-on wake-up signal, the power-on wake-up signal is processed by frequency modulation digital encoding to generate a first modulation control signal, and a first PWM signal corresponding to the first modulation control signal is output. The frequency of the first modulation control signal is the center frequency. ; The NMOS transistor is driven to operate using the first PWM signal; After the first modulation control signal is demodulated by the driving circuit module, the lighting module is driven to work in the working mode before power-off.
5. The single-loop lighting control method according to claim 4, characterized in that, The specific steps for switching the working state also include: In the power-on state, if the input control signal is a power-off signal, the power-off signal is processed by frequency modulation digital encoding to generate a second modulation control signal, and a second PWM signal corresponding to the second modulation control signal is output. The NMOS transistor is driven to operate using the second PWM signal; After the driving circuit module demodulates the second modulation control signal, it saves the current working mode and then controls the lighting module to turn off.
6. The single-loop lighting control method according to claim 4, characterized in that, The specific steps for switching the working state also include: When the device is powered on, if the input control signal is a stepless adjustment signal, the stepless adjustment signal is processed by frequency modulation digital encoding to generate a third modulation control signal, and a third PWM signal corresponding to the third modulation control signal is output. The NMOS transistor is driven by the third PWM signal. After the driving circuit module demodulates the third modulation control signal, it controls and adjusts the lighting brightness or color temperature of the lighting module.
7. A single-loop lighting control circuit, characterized in that, For implementing the single-loop lighting control method as described in any one of claims 1-6, the single-loop lighting control circuit includes a control circuit module, a drive circuit module, a power supply module, and a lighting module; the control circuit module and the drive circuit module are connected in series between the positive and negative terminals of the power supply module; the control circuit module includes an NMOS transistor, the source of which is connected to the negative terminal of the power supply module, and its drain is connected to the drive circuit unit.
8. The single-loop lighting control circuit according to claim 7, characterized in that, The control circuit module further includes a first control unit, a first energy storage capacitor, and multiple control switches; the gate of the NMOS transistor is connected to the first control unit, its source is connected to the negative terminal of the power supply module, and its drain is connected to the positive terminal of the first energy storage capacitor; the first energy storage capacitor is connected in parallel between the power supply terminal of the first control unit and the negative terminal of the power supply module. The drive circuit module includes a second control unit, a power drive unit, a second energy storage capacitor, and a first inductor; the first inductor is connected in series between the drain of the NMOS transistor and the negative terminal of the second energy storage capacitor; the second energy storage capacitor is connected in parallel between the power supply terminal of the second control unit and the positive terminal of the power module; the second control unit is connected to the drain of the NMOS transistor and the power drive unit; The first control unit is used to acquire the input control signals of each control switch, generate a modulation control signal by frequency modulation digital encoding of the input control signals, and then output a PWM signal corresponding to the modulation control signal to drive the NMOS transistor to work; the second control unit is used to demodulate the modulation control signal transmitted by the switching action of the NMOS transistor to obtain a lighting control signal; the power drive unit drives the lighting module to work according to the lighting control signal.
9. The single-loop lighting control circuit according to claim 7, characterized in that, The driving circuit module further includes a coupling capacitor, one end of which is connected to the drain of the NMOS transistor and the other end of which is connected to the second control unit; the driving circuit module further includes a first resistor, one end of which is connected to the drain of the NMOS transistor and the other end of which is connected to the positive terminal of the power supply module.
10. A lighting device, characterized in that, Includes the single-loop lighting control circuit as described in any one of claims 7-9.