A dimming control circuit and a lamp

Abstract

The utility model provides a kind of dimming control circuit, including drive module, acquisition module, adjustment module and signal processing module, drive module according to its feedback end control the voltage size of its drive output end output;Acquisition module is connected in series in the loop where lighting module is, according to the current size flowing through it control its acquisition output end output;Adjustment module can control the voltage size of its adjustment output end output;Signal processing module includes signal processing unit, signal processing unit according to the difference of its acquisition input end and adjustment input end control the voltage size of its signal processing output end output;Acquisition output end is connected with acquisition input end, adjustment output end is connected with adjustment input end, signal processing output end is connected with feedback end.The utility model's dimming control circuit, can significantly reduce the risk that special chip production is stopped and needs to be reset circuit, low in cost;And it can be compatible with multiple dimming protocols.The utility model further provides a kind of lighting lamp.

Description

Technical Field

[0001] This utility model relates to the field of lighting, and in particular to dimming control circuits and lamps. Background Technology

[0002] In the field of LED lighting, traditional dimming control circuits usually rely on dedicated constant current driver chips. This type of solution has significant drawbacks: dedicated chips have long supply cycles and are susceptible to production stoppage risks, resulting in limited product lifecycles; dedicated chips are expensive and have complex peripheral circuits, which is not conducive to cost control of small and medium power LED lamps; if dimming is required, the constant current driver chip must have its own PWM dimming interface, which is not flexible enough, has poor compatibility, and has a single protocol, making it impossible for dedicated dimming chips to adapt to diverse terminal devices. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, this invention provides a dimming control circuit that significantly reduces the risk of needing to reconfigure the circuit due to the discontinuation of dedicated chips; it also breaks the dependence on a single supplier, resulting in lower costs; while ensuring dimming performance, it effectively solves the long-standing supply chain risks and cost issues in the lighting driver field; furthermore, it is compatible with multiple dimming protocols and adapts to different control systems, making it more practical. This invention also provides a lighting fixture.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] A dimming control circuit for driving a lighting module, comprising:

[0006] A driving module having a driving output terminal and a feedback terminal, the driving module being configured to control the magnitude of the voltage output by its driving output terminal according to the magnitude of the voltage received by its feedback terminal;

[0007] The acquisition module is connected in series in the circuit where the lighting module is located, and the feedback module is configured to convert the magnitude of the current flowing through it into a corresponding acquisition voltage signal and output it through its acquisition output terminal.

[0008] An adjustment module having an adjustment output terminal, and the adjustment module being configured to: respond to a user operation and adjust the voltage of the adjustment signal output by the adjustment output terminal according to the user operation;

[0009] And a signal processing module, the signal processing module including a signal processing unit, the signal processing unit having an acquisition input terminal, an adjustment input terminal and a signal processing output terminal, and the signal processing unit being configured to: control the voltage magnitude of the processed signal output by its signal processing output terminal according to the difference between the acquisition input terminal and the adjustment input terminal;

[0010] The acquisition output terminal of the acquisition module is connected to the acquisition input terminal of the signal processing unit, the adjustment output terminal of the adjustment module is connected to the adjustment input terminal of the signal processing unit, and the signal processing output terminal of the signal processing unit is connected to the feedback terminal of the drive module.

[0011] Using the above technical solution, when a user needs to change the brightness of the lighting module, the user can adjust the adjustment module. At this time, the voltage change of the adjustment signal output by the adjustment module is the voltage change of the adjustment input terminal in the signal processing module. The difference between the acquisition input terminal and the adjustment input terminal of the signal processing module is generated. The signal processing module then adjusts the voltage of its output processing signal, that is, the voltage change received by the feedback terminal of the drive module and the voltage change output by the output terminal of the drive module. Ultimately, the voltage output by the acquisition module and the voltage of the adjustment signal output by the adjustment module are balanced, thereby realizing the dimming of the lighting module.

[0012] Specifically, when the adjustment module reduces its output voltage, the voltage output by the drive module also decreases, so that the voltage output by the acquisition module is balanced with the voltage of the adjustment signal output by the adjustment module, and the brightness of the lighting module decreases; when the adjustment module increases its output voltage, the voltage output by the drive module also increases, so that the voltage output by the acquisition module is balanced with the voltage of the adjustment signal output by the adjustment module, and the brightness of the lighting module increases.

[0013] Furthermore, in the above technical solution, there are many general-purpose chips or components on the market that can meet the requirements of the driving module, the acquisition module, the adjustment module, and the signal processing module. Therefore, the driving module, the acquisition module, the adjustment module, and the signal processing module can all be built using conventional general-purpose components. For example, the driving module can be built using a general-purpose DC / DC chip, the acquisition module can be built using a resistor, the adjustment module can be built using an adjustable voltage source, PWM, adjustable resistor, etc., and the signal processing module can be built using an operational amplifier. The above components have a high degree of standardization, which can significantly reduce the risk of needing to redesign the circuit due to the discontinuation of dedicated chips. Moreover, the above components are general-purpose components with multiple supply sources, breaking the dependence on a single supplier, and are low in cost. While ensuring dimming performance, it effectively solves the long-standing supply chain risks and cost problems in the lighting driver field.

[0014] Furthermore, the adjustment module includes an adjustment interface having a first adjustment access terminal and a second adjustment access terminal, the second adjustment access terminal being connected to a reference ground; the adjustment interface can be used to connect to at least one of an adjustable voltage DC power supply, a variable resistor, and a PWM output source;

[0015] When the adjustment interface can be used to connect to an adjustable voltage DC power supply, the first adjustment access terminal is used to connect to the positive terminal of the adjustable voltage DC power supply, the second adjustment access terminal is used to connect to the negative terminal of the adjustable voltage DC power supply, and the first adjustment access terminal is formed as the adjustment output terminal.

[0016] When the adjustment interface can be used to connect to a variable resistor, the adjustment module further includes a constant current source unit, which is configured to output a constant current. The output terminal of the constant current source unit is connected to the first adjustment access terminal. The first adjustment access terminal is used to connect to one end of the variable resistor, and the second adjustment access terminal is used to connect to the other end of the variable resistor. The first adjustment access terminal forms the adjustment output terminal.

[0017] When the adjustment interface can be used to connect to a PWM output source, the adjustment module further includes a conversion unit, which is configured to convert the PWM adjustment signal output by the PWM output source into a DC voltage of the corresponding voltage and output it. The input terminal of the conversion unit is connected to the first adjustment access terminal, which is used to connect to the positive terminal of the PWM output source, and the second adjustment access terminal is used to connect to the negative terminal of the PWM output source. The output terminal of the conversion unit is formed as the adjustment output terminal.

[0018] By adopting the above technical solution, the dimming control circuit becomes more reasonable, enabling it to be compatible with multiple dimming protocols and adapt to different control systems.

[0019] When the adjustment interface can be used to connect to an adjustable voltage DC power supply, the user can adjust the output voltage by operating the adjustable voltage DC power supply.

[0020] When the adjustment interface can be used to connect to a variable resistor, the user operates the variable resistor to change its resistance, while the current output by the constant current source unit to the variable resistor remains constant, thereby realizing the adjustment of the output voltage;

[0021] When the adjustment interface can be connected to a PWM output source, the user can operate the PWM output source to change its duty cycle and output a corresponding DC voltage through the conversion unit, thereby achieving output voltage adjustment.

[0022] Furthermore, the constant current source unit includes a third transistor, a fortieth resistor, a forty-first resistor, and a voltage regulator. The emitter of the third transistor is connected to the positive terminal of the power supply through the fortieth resistor, and the base of the third transistor is connected to the reference ground through the forty-first resistor. The voltage regulator is connected to the base of the third transistor to clamp its voltage. The collector of the third transistor is formed as the output terminal of the constant current source unit.

[0023] By adopting the above technical solution, the constant current source unit becomes more reasonable. The voltage regulator clamps the voltage at the base of the third transistor. Since the base and emitter voltages of the third transistor are approximately constant, the voltage and current across the fortieth resistor are also basically constant. The collector current of the third transistor is approximately equal to its emitter current, thereby achieving constant current output.

[0024] Furthermore, the voltage regulator is a precision voltage regulator, the anode of the precision voltage regulator is connected to the base of the third transistor, the cathode of the precision voltage regulator is connected to the end of the fortieth resistor connected to the positive terminal of the power supply, and the reference terminal of the precision voltage regulator is short-circuited to its cathode.

[0025] The above technical solution makes the voltage regulator more reasonable; specifically, the precision voltage regulator uses TL431.

[0026] Furthermore, the third transistor is a PNP type transistor.

[0027] The above technical solution makes the third transistor more reasonable.

[0028] Furthermore, the conversion unit includes a forty-second resistor and a thirty-second capacitor. One end of the forty-second resistor is formed as the input terminal of the conversion unit, and the other end of the forty-second resistor is connected to one end of the thirty-second capacitor. The other end of the thirty-second capacitor is connected to a reference ground, and the connection point between the forty-second resistor and the thirty-second capacitor forms the output terminal of the conversion unit.

[0029] The above technical solution makes the conversion unit more reasonable. It realizes the conversion of the PWM adjustment signal output by the PWM output source through the RC network composed of the forty-second resistor and the thirty-second capacitor. The structure is simple and the cost is low.

[0030] Furthermore, the signal processing module includes a first operational amplifier, which has a first non-inverting input terminal, a first inverting input terminal, and a first operational amplifier output terminal. The first non-inverting input terminal is formed as the acquisition input terminal of the signal processing module, the inverting input terminal is formed as the adjustment input terminal of the signal processing module, and the first operational amplifier output terminal is formed as the signal processing output terminal of the signal processing module.

[0031] The signal processing module includes a thirty-sixth resistor and a thirtyth capacitor. The first inverting input terminal is connected to one end of the thirty-sixth resistor, the other end of the thirty-sixth resistor is connected to one end of the thirtyth capacitor, and the other end of the thirtyth capacitor is connected to the output terminal of the first operational amplifier.

[0032] By adopting the above technical solution, the signal processing module becomes more reasonable, and the first operational amplifier can realize the function of the signal processing module at a low cost.

[0033] Because the first operational amplifier has extremely high input impedance and extremely low output impedance, it provides a certain degree of isolation for the acquisition module and the adjustment module, thereby preventing the load from affecting the acquisition module and the adjustment module and effectively improving the light sensitivity of the adjustment.

[0034] Furthermore, the above structure can amplify the voltage difference between the acquisition module and the adjustment module, greatly improving the adjustment accuracy.

[0035] The arrangement of the thirtieth capacitor and the thirty-sixth resistor allows the current injection into the drive module to be slow enough to avoid triggering the overvoltage protection at the feedback terminal of the drive module during a step load transition from 100% to 0%.

[0036] Furthermore, the output of the first operational amplifier is output to the outside through the thirty-first resistor.

[0037] By adopting the above technical solution, the signal processing module becomes more reasonable, and the setting of the thirty-first resistor can limit the output size of the first operational amplifier to a certain extent.

[0038] Furthermore, the dimming control circuit includes a blanking circuit module for pulling the level of the adjustment input terminal low during the circuit startup phase.

[0039] By adopting the above technical solution, the dimming control circuit becomes more reasonable. Due to the setting of the blanking circuit module, the level of the adjustment input terminal can be pulled low during the circuit startup phase, thereby avoiding the brief spike in the output current of the drive module.

[0040] Furthermore, the blanking circuit module includes a second controllable switch, a thirty-third capacitor, and a thirty-ninth resistor. The second controllable switch has a third controllable switch terminal, a fourth controllable switch terminal, and a second switch control terminal. The third controllable switch terminal is connected to the adjustment input terminal, and the fourth controllable switch terminal is connected to a reference ground. One end of the thirty-third capacitor is connected to the positive terminal of the power supply, and the other end of the thirty-third capacitor is connected to one end of the thirty-ninth resistor. The other end of the thirty-ninth resistor is connected to a reference ground. The connection point between the thirty-third capacitor and the thirty-ninth resistor is connected to the second switch control terminal. The second controllable switch is configured such that when its second switch control terminal is high, it controls the third controllable switch terminal and the fourth controllable switch terminal to connect; and when its second switch control terminal is not high, it controls the third controllable switch terminal and the fourth controllable switch terminal to disconnect.

[0041] By adopting the above technical solution, the blanking circuit module becomes more reasonable. During the circuit startup phase and at the moment of power-on, the thirty-third capacitor begins to charge, which is equivalent to a short circuit. Therefore, the second control terminal of the second controllable switch is at a high level. At this time, the third and fourth controllable switch terminals of the second controllable switch are connected, making the adjustment input terminal connected to the reference ground at a low level. When the thirty-third capacitor finishes charging, it is equivalent to an open circuit. Therefore, the second control terminal of the second controllable switch is at a non-high level. At this time, the third and fourth controllable switch terminals of the second controllable switch are disconnected, making the adjustment input terminal disconnected from the reference ground, which normally corresponds to the adjustment module.

[0042] Furthermore, the second controllable switch is a second MOSFET, the second MOSFET is an N-type MOSFET, the drain of the second MOSFET is formed as the third controllable switch terminal, the source of the second MOSFET is formed as the fourth controllable switch terminal, and the gate of the second MOSFET is formed as the second switch control terminal.

[0043] The above technical solution makes the second controllable switch more reasonable; specifically, the second MOS transistor is an NMOS transistor.

[0044] Furthermore, the dimming control circuit includes a signal amplification module. The acquisition output terminal of the acquisition module is connected to the input terminal of the signal amplification module, and the output terminal of the signal amplification module is connected to the acquisition input terminal of the signal processing unit. The signal amplification module is configured to amplify the signal input at its input terminal and then output it through its output terminal.

[0045] By adopting the above technical solution, the dimming control circuit becomes more reasonable; the signal amplification module can amplify the signal output by the acquisition module, which can greatly improve the dimming accuracy and linearity.

[0046] Furthermore, the signal amplification module includes a second operational amplifier, which has a second non-inverting input terminal, a second inverting input terminal, and a second operational amplifier output terminal. The second non-inverting input terminal is formed as the input terminal of the signal amplification module, and the second operational amplifier output terminal is formed as the output terminal of the signal amplification module. The second inverting input terminal is connected to a reference ground through a thirty-fifth resistor, and a thirty-fourth resistor is connected across the second inverting input terminal and the second operational amplifier output terminal.

[0047] The above technical solution makes the signal amplification module more reasonable; since the second operational amplifier has extremely high input impedance and extremely low output impedance, it plays a certain role in isolating the acquisition module, which can prevent the load from affecting the acquisition module and effectively improve the light sensitivity.

[0048] Furthermore, a twenty-ninth capacitor is connected across the second inverting input terminal and the output terminal of the second operational amplifier.

[0049] The above technical solution makes the signal amplification module more reasonable.

[0050] Furthermore, the output of the signal amplification module is output to the outside through the thirty-eighth resistor.

[0051] By adopting the above technical solution, the setting of the thirty-eighth resistor can limit the output of the signal amplification module to a certain extent.

[0052] Furthermore, a thirty-third resistor is connected in series between the acquisition output terminal of the acquisition module and the input terminal of the signal amplification module.

[0053] By adopting the above technical solution, the connection between the acquisition module and the signal amplification module becomes more reasonable.

[0054] Furthermore, the driving module includes a constant current buck chip, and the constant current buck chip has the feedback terminal. The constant current buck chip is configured to adjust its switching duty cycle according to the voltage received at its feedback terminal, so as to adjust the voltage output by the driving output terminal.

[0055] The above technical solution makes the driving module more reasonable; the constant current buck chip and its peripheral circuit can realize the driving module; specifically, the constant current buck chip adopts BP2879, and the feedback terminal is formed as the FB pin of the constant current buck chip.

[0056] Furthermore, the constant current buck chip has a current detection pin, and the acquisition voltage signal output by the acquisition module is sent to the current detection pin of the constant current buck chip.

[0057] By adopting the above technical solution, the constant current buck chip becomes more reasonable, and the acquisition voltage signal output by the acquisition module can be sent to the current detection pin of the constant current buck chip to report the light sensitivity.

[0058] Furthermore, the acquisition module employs a resistor or a resistor assembly.

[0059] The above technical solution makes the acquisition module more reasonable; the resistor component can be understood as including multiple resistors, and the multiple resistors are connected in series and / or in parallel.

[0060] Furthermore, the dimming control circuit includes a protection diode for providing input voltage clamping protection, the cathode of the protection diode being connected to the first adjustment access terminal, and the anode of the protection diode being connected to the second adjustment access terminal.

[0061] By adopting the above technical solution, the setting of the protection diode can protect the output of the adjustment interface and effectively avoid the effects of excessive voltage output and reverse connection.

[0062] Furthermore, the protection diode is a second Zener diode.

[0063] The above technical solution makes the protection diode more reasonable.

[0064] Furthermore, the dimming control circuit includes a power module for introducing electrical energy, the power module having a positive power terminal for outputting electrical energy.

[0065] The above technical solution makes the dimming control circuit more reasonable; the power supply module provides power to the drive module, the signal processing module, and the adjustment module.

[0066] Furthermore, the dimming control circuit includes a voltage regulator module for stabilizing the voltage, and the positive terminal of the power supply is output to the outside through the voltage regulator module.

[0067] By adopting the above technical solution, the voltage regulator module can stabilize the voltage, thereby ensuring a stable and reliable power supply.

[0068] Furthermore, the voltage regulator module includes a fourth transistor, a third Zener diode, and a thirty-second resistor. The collector of the fourth transistor is connected to the positive terminal of the power supply, the emitter of the fourth transistor forms the output terminal of the voltage regulator module, the base of the fourth transistor is connected to the cathode of the third Zener diode, the anode of the third Zener diode is connected to a reference ground, and the thirty-second resistor is connected between the collector and the base of the fourth transistor.

[0069] The above technical solution makes the voltage regulator module more reasonable.

[0070] Furthermore, a thirty-first capacitor is connected between the output terminal of the voltage regulator module and the reference ground.

[0071] The above technical solution makes the voltage regulator module more reasonable.

[0072] A lighting fixture includes a dimming control circuit as described above and an illumination module for emitting light, wherein the positive terminal of the illumination module is connected to the drive output terminal and the negative terminal of the illumination module is connected to a reference ground.

[0073] By adopting the above technical solution, the lamps become more reasonable, significantly reducing the risk of needing to reconfigure the circuit due to the discontinuation of dedicated chips; it also breaks the dependence on a single supplier and is low in cost; while ensuring dimming performance, it effectively solves the long-standing supply chain risks and cost problems in the field of lighting drivers.

[0074] Compared with the prior art, the present invention has the following beneficial effects:

[0075] (1) The dimming control circuit and lighting fixture of this utility model can significantly reduce the risk of needing to reset the circuit due to the discontinuation of dedicated chips; and can break the dependence on a single supplier, resulting in low cost; while ensuring dimming performance, it effectively solves the long-standing supply chain risk and cost problem in the field of lighting drive; and it can be compatible with multiple dimming protocols and adapted to different control systems, making it more practical.

[0076] (2) The dimming control circuit and lighting fixture of this utility model are reasonably designed. Attached Figure Description

[0077] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0078] Figure 1 This is a schematic diagram of the drive module and the acquisition module in the dimming control circuit of this utility model;

[0079] Figure 2 This is a schematic diagram of the structure of the adjustment module, signal processing unit, blanking circuit module and signal amplification module in the dimming control circuit of this utility model;

[0080] The component names corresponding to the various reference numerals in the figure are as follows: 1. Drive module; 101. Drive output terminal; 102. Feedback terminal; 2. Acquisition module; 201. Acquisition output terminal; 3. Adjustment module; 301. Adjustment output terminal; 302. Adjustment interface; 3021. First adjustment access terminal; 3022. Second adjustment access terminal; 303. Adjustable voltage DC power supply; 304. Variable resistor; 305. PWM output source; 306. Constant current source unit; 307. Conversion unit; 4. Signal processing module; 401, Signal processing unit; 4011, Acquisition input terminal; 4012, Adjustment input terminal; 4013, Signal processing output terminal; 5, Blanking circuit module; 501, Second controllable switch; 5011, Third controllable switch terminal; 5012, Fourth controllable switch terminal; 5013, Second switch control terminal; 6, Signal amplification module; 7, Power supply module; 701, Positive power supply terminal; 8, Voltage regulator module; U3, Constant current step-down chip; U3-1, Current detection pin; U 4A, Second operational amplifier; U4A-1, Second non-inverting input; U4A-2, Second inverting input; U4A-3, Second operational amplifier output; U4B, First operational amplifier; U4B-1, First non-inverting input; U4B-2, First inverting input; U4B-3, First operational amplifier output; U5, Voltage regulator; Q2, Second MOSFET; Q3, Third transistor; Q4, Fourth transistor; R32, Thirty-second resistor; R33, Thirtyth resistor. Three resistors; R34, the thirty-fourth resistor; R35, the thirty-fifth resistor; R36, the thirty-sixth resistor; R38, the thirty-eighth resistor; R39, the thirty-ninth resistor; R40, the fortieth resistor; R41, the forty-first resistor; R42, the forty-second resistor; C29, the twenty-ninth capacitor; C30, the thirtieth capacitor; C31, the thirty-first capacitor; C32, the thirty-second capacitor; C33, the thirty-third capacitor; VR2, the protection diode; VR3, the third Zener diode. Detailed Implementation

[0081] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0082] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0083] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0084] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0085] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0086] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0087] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0088] See Figures 1 to 2 This utility model provides a dimming control circuit for driving a lighting module, comprising:

[0089] A driving module 1 has a driving output terminal 101 and a feedback terminal 102. The driving module 1 is configured to control the voltage output of its driving output terminal 101 according to the voltage received by its feedback terminal 102.

[0090] Acquisition module 2 is connected in series in the circuit where the lighting module is located, and the feedback module is configured to convert the magnitude of the current flowing through it into a corresponding acquisition voltage signal and output it through its acquisition output terminal 201.

[0091] The adjustment module 3 has an adjustment output terminal 301 and is configured to respond to user operation and adjust the voltage of the adjustment signal output by the adjustment output terminal 301 according to the user operation.

[0092] And a signal processing module 4, the signal processing module 4 including a signal processing unit 401, the signal processing unit 401 having a data acquisition input terminal 4011, an adjustment input terminal 4012 and a signal processing output terminal 4013, and the signal processing unit 401 being configured to: control the voltage magnitude of the processed signal output by its signal processing output terminal 4013 according to the difference between the data acquisition input terminal 4011 and the adjustment input terminal 4012;

[0093] The acquisition output terminal 201 of the acquisition module 2 is connected to the acquisition input terminal 4011 of the signal processing unit 401, the adjustment output terminal 301 of the adjustment module 3 is connected to the adjustment input terminal 4012 of the signal processing unit 401, and the signal processing output terminal 4013 of the signal processing unit 401 is connected to the feedback terminal 102 of the drive module 1.

[0094] Using the above technical solution, when a user needs to change the brightness of the lighting module, the user can adjust the adjustment module 3. At this time, the voltage change of the adjustment signal output by the adjustment module 3 is the voltage change of the adjustment input terminal 4012 in the signal processing module 4. The difference between the acquisition input terminal 4011 and the adjustment input terminal 4012 of the signal processing module 4 is generated. The signal processing module 4 then adjusts the voltage of its output processing signal, that is, the voltage change received by the feedback terminal 102 of the drive module 1 and the voltage change output by the output terminal of the drive module 1, ultimately making the voltage output by the acquisition module 2 and the voltage of the adjustment signal output by the adjustment module 3 balanced, thereby realizing the dimming of the lighting module.

[0095] Specifically, when the adjustment module 3 reduces its output voltage, the voltage output by the drive module 1 also decreases, so that the voltage output by the acquisition module 2 is balanced with the voltage of the adjustment signal output by the adjustment module 3, and the brightness of the lighting module decreases; when the adjustment module 3 increases its output voltage, the voltage output by the drive module 1 also increases, so that the voltage output by the acquisition module 2 is balanced with the voltage of the adjustment signal output by the adjustment module 3, and the brightness of the lighting module increases.

[0096] Furthermore, in the above technical solution, there are many general-purpose chips or components on the market that can meet the requirements of the driving module 1, the acquisition module 2, the adjustment module 3, and the signal processing module 4. Therefore, the driving module 1, the acquisition module 2, the adjustment module 3, and the signal processing module 4 can all be built using conventional general-purpose components. For example, the driving module 1 can be built using a general-purpose DC / DC chip, the acquisition module 2 can be built using a resistor, the adjustment module 3 can be built using an adjustable voltage source, PWM, adjustable resistor, etc., and the signal processing module 4 can be built using an operational amplifier. The above components have a high degree of standardization, which can significantly reduce the risk of needing to redesign the circuit due to the discontinuation of dedicated chips. Moreover, the above components are general-purpose components with multiple supply sources, breaking the dependence on a single supplier, and the cost is low. While ensuring dimming performance, it effectively solves the long-standing supply chain risks and cost problems in the lighting drive field.

[0097] Furthermore, the adjustment module 3 includes an adjustment interface 302 having a first adjustment access terminal 3021 and a second adjustment access terminal 3022, the second adjustment access terminal 3022 being connected to a reference ground; the adjustment interface 302 can be used to connect to at least one of an adjustable voltage DC power supply 303, a variable resistor 304, and a PWM output source 305.

[0098] When the adjustment interface 302 can be used to connect to the adjustable voltage DC power supply 303, the first adjustment access terminal 3021 is used to connect to the positive terminal of the adjustable voltage DC power supply 303, the second adjustment access terminal 3022 is used to connect to the negative terminal of the adjustable voltage DC power supply 303, and the first adjustment access terminal 3021 is formed as the adjustment output terminal 301.

[0099] When the adjustment interface 302 can be used to connect to the variable resistor 304, the adjustment module 3 further includes a constant current source unit 306, which is configured to output a constant current. The output terminal of the constant current source unit 306 is connected to the first adjustment access terminal 3021, which is used to connect to one end of the variable resistor 304, and the second adjustment access terminal 3022 is used to connect to the other end of the variable resistor 304. The first adjustment access terminal 3021 is formed as the adjustment output terminal 301.

[0100] When the adjustment interface 302 can be used to connect to the PWM output source 305, the adjustment module 3 further includes a conversion unit 307. The conversion unit 307 is configured to convert the PWM adjustment signal output by the PWM output source 305 into a DC voltage of the corresponding voltage and output it. The input terminal of the conversion unit 307 is connected to the first adjustment access terminal 3021, which is used to connect to the positive terminal of the PWM output source 305. The second adjustment access terminal 3022 is used to connect to the negative terminal of the PWM output source 305. The output terminal of the conversion unit 307 is formed as the adjustment output terminal 301.

[0101] By adopting the above technical solution, the dimming control circuit becomes more reasonable, enabling it to be compatible with multiple dimming protocols and adapt to different control systems.

[0102] When the adjustment interface 302 can be used to connect to the adjustable voltage DC power supply 303, the user can adjust the output voltage by operating the adjustable voltage DC power supply 303;

[0103] When the adjustment interface 302 can be used to connect to the variable resistor 304, the user operates the variable resistor 304 to change its resistance value, and the current output by the constant current source unit 306 to the variable resistor 304 is constant, so the output voltage can be adjusted.

[0104] When the adjustment interface 302 can be connected to the PWM output source 305, the user can operate the PWM output source 305 to change its duty cycle, and output the corresponding DC voltage through the conversion unit 307 to achieve the adjustment of the output voltage.

[0105] Furthermore, the constant current source unit 306 includes a third transistor Q3, a fortieth resistor R40, a forty-first resistor R41, and a voltage regulator U5. The emitter of the third transistor Q3 is connected to the positive terminal of the power supply 701 through the fortieth resistor R40, and the base of the third transistor Q3 is connected to the reference ground through the forty-first resistor R41. The voltage regulator U5 is connected to the base of the third transistor Q3 to clamp its voltage. The collector of the third transistor Q3 is formed as the output terminal of the constant current source unit 306.

[0106] By adopting the above technical solution, the constant current source unit 306 is more reasonable. The voltage regulator U5 clamps the voltage at the base of the third transistor Q3. Since the base and emitter voltages of the third transistor Q3 are approximately constant, the voltage and current on the fortieth resistor R40 are also basically constant. The collector current of the third transistor Q3 is approximately equal to its emitter current, thereby achieving constant current output.

[0107] Furthermore, the voltage regulator U5 is a precision voltage regulator. The anode of the precision voltage regulator is connected to the base of the third transistor Q3, the cathode of the precision voltage regulator is connected to the end of the fortieth resistor R40 connected to the positive terminal 701 of the power supply, and the reference terminal of the precision voltage regulator is short-circuited to its cathode.

[0108] The above technical solution makes the voltage regulator U5 more reasonable; specifically, the precision voltage regulator uses TL431.

[0109] Furthermore, the third transistor Q3 is a PNP type transistor.

[0110] The above technical solution makes the third transistor Q3 more reasonable.

[0111] Furthermore, the conversion unit 307 includes a forty-second resistor R42 and a thirty-second capacitor C32. One end of the forty-second resistor R42 is formed as the input terminal of the conversion unit 307, and the other end of the forty-second resistor R42 is connected to one end of the thirty-second capacitor C32. The other end of the thirty-second capacitor C32 is connected to a reference ground, and the connection point between the forty-second resistor R42 and the thirty-second capacitor C32 is formed as the output terminal of the conversion unit 307.

[0112] The above technical solution makes the conversion unit 307 more reasonable. It converts the PWM adjustment signal output by the PWM output source 305 through the RC network composed of the forty-second resistor R42 and the thirty-second capacitor C32. The structure is simple and the cost is low.

[0113] Furthermore, the signal processing module 4 includes a first operational amplifier U4B, which has a first non-inverting input terminal U4B-1, a first inverting input terminal U4B-2, and a first operational amplifier output terminal U4B-3. The first non-inverting input terminal U4B-1 is formed as the acquisition input terminal 4011 of the signal processing module 4, the inverting input terminal is formed as the adjustment input terminal 4012 of the signal processing module 4, and the first operational amplifier output terminal U4B-3 is formed as the signal processing output terminal 4013 of the signal processing module 4.

[0114] The signal processing module 4 includes a 36th resistor R36 and a 30th capacitor C30. The first inverting input terminal U4B-2 is connected to one end of the 36th resistor R36, the other end of the 36th resistor R36 is connected to one end of the 30th capacitor C30, and the other end of the 30th capacitor C30 is connected to the output terminal U4B-3 of the first operational amplifier.

[0115] The above technical solution makes the signal processing module 4 more reasonable, and the first operational amplifier U4B can realize the function of the signal processing module 4 at a low cost.

[0116] Since the first operational amplifier U4B has extremely high input impedance and extremely low output impedance, it plays a certain role in isolating the acquisition module 2 and the adjustment module 3, which can prevent the load from affecting the acquisition module 2 and the adjustment module 3, and effectively improve the light sensitivity of the adjustment.

[0117] Furthermore, the above structure can amplify the voltage difference between the output voltages of the acquisition module 2 and the adjustment module 3, greatly improving the adjustment accuracy.

[0118] Due to the configuration of the thirtieth capacitor C30 and the thirty-sixth resistor R36, the current injection into the drive module 1 can be slow enough to avoid triggering the overvoltage protection of the feedback terminal 102 of the drive module 1 when the load jumps from 100% to 0%.

[0119] Furthermore, the output terminal U4B-3 of the first operational amplifier is output to the outside through the thirty-first resistor.

[0120] By adopting the above technical solution, the signal processing module 4 becomes more reasonable, and the setting of the thirty-first resistor can limit the output size of the first operational amplifier U4B to a certain extent.

[0121] Furthermore, the dimming control circuit includes a blanking circuit module 5 for pulling the level of the adjustment input terminal 4012 low during the circuit startup phase.

[0122] By adopting the above technical solution, the dimming control circuit becomes more reasonable. Due to the setting of the blanking circuit module 5, the level of the adjustment input terminal 4012 can be pulled low during the circuit startup phase, thereby avoiding the brief spike in the output current of the drive module 1.

[0123] Further, the blanking circuit module 5 includes a second controllable switch 501, a thirty-third capacitor C33, and a thirty-ninth resistor R39. The second controllable switch 501 has a third controllable switch terminal 5011, a fourth controllable switch terminal 5012, and a second switch control terminal 5013. The third controllable switch terminal 5011 is connected to the adjustment input terminal 4012, and the fourth controllable switch terminal 5012 is connected to the reference ground. One end of the thirty-third capacitor C33 is connected to the positive terminal of the power supply 701, and the other end of the thirty-third capacitor C33 is connected to the thirty-ninth resistor R39. One end of resistor R39 is connected, and the other end of the thirty-ninth resistor R39 is connected to reference ground. The connection point between the thirty-third capacitor C33 and the thirty-ninth resistor R39 is connected to the second switch control terminal 5013. The second controllable switch 501 is configured such that when its second switch control terminal 5013 is at a high level, it controls the third controllable switch terminal 5011 and the fourth controllable switch terminal 5012 to connect; and when its second switch control terminal 5013 is at a non-high level, it controls the third controllable switch terminal 5011 and the fourth controllable switch terminal 5012 to disconnect.

[0124] By adopting the above technical solution, the blanking circuit module 5 becomes more reasonable. During the circuit startup phase and power-on instant, the 33rd capacitor C33 begins charging, which is equivalent to a short circuit. Therefore, the second switch control terminal 5013 of the second controllable switch 501 is at a high level. At this time, the third controllable switch terminal 5011 and the fourth controllable switch terminal 5012 of the second controllable switch 501 are connected, making the adjustment input terminal 4012 connected to the reference ground at a low level. When the 33rd capacitor C33 finishes charging, it is equivalent to an open circuit. Therefore, the second switch control terminal 5013 of the second controllable switch 501 is at a non-high level. At this time, the third controllable switch terminal 5011 and the fourth controllable switch terminal 5012 of the second controllable switch 501 are disconnected, making the adjustment input terminal 4012 disconnected from the reference ground, which normally corresponds to the adjustment module 3.

[0125] Furthermore, the second controllable switch 501 adopts a second MOSFET Q2, the second MOSFET Q2 is an N-type MOSFET, the drain of the second MOSFET Q2 is formed as the third controllable switch terminal 5011, the source of the second MOSFET Q2 is formed as the fourth controllable switch terminal 5012, and the gate of the second MOSFET Q2 is formed as the second switch control terminal 5013.

[0126] The above technical solution makes the second controllable switch 501 more reasonable; specifically, the second MOS transistor Q2 is an NMOS transistor.

[0127] Furthermore, the dimming control circuit includes a signal amplification module 6. The acquisition output terminal 201 of the acquisition module 2 is connected to the input terminal of the signal amplification module 6, and the output terminal of the signal amplification module 6 is connected to the acquisition input terminal 4011 of the signal processing unit 401. The signal amplification module 6 is configured to amplify the signal input at its input terminal and then output it through its output terminal.

[0128] By adopting the above technical solution, the dimming control circuit becomes more reasonable; the signal amplification module 6 can amplify the signal output by the acquisition module 2, which can greatly improve the dimming accuracy and linearity.

[0129] Furthermore, the signal amplification module 6 includes a second operational amplifier U4A, which has a second non-inverting input terminal U4A-1, a second inverting input terminal U4A-2, and a second operational amplifier output terminal U4A-3. The second non-inverting input terminal U4A-1 is formed as the input terminal of the signal amplification module 6, and the second operational amplifier output terminal U4A-3 is formed as the output terminal of the signal amplification module 6. The second inverting input terminal U4A-2 is connected to the reference ground through the thirty-fifth resistor R35, and the thirty-fourth resistor R34 is connected across the second inverting input terminal U4A-2 and the second operational amplifier output terminal U4A-3.

[0130] The above technical solution makes the signal amplification module 6 more reasonable; since the second operational amplifier U4A has extremely high input impedance and extremely low output impedance, it plays a certain role in isolating the acquisition module 2, which can avoid the load from affecting the acquisition module 2 and effectively improve the light sensitivity.

[0131] Furthermore, a twenty-ninth capacitor C29 is connected across the second inverting input terminal U4A-2 and the second operational amplifier output terminal U4A-3.

[0132] The above technical solution makes the signal amplification module 6 more reasonable.

[0133] Furthermore, the output of the signal amplification module 6 is output to the outside through the thirty-eighth resistor R38.

[0134] By adopting the above technical solution, the setting of the thirty-eighth resistor R38 can limit the output of the signal amplification module 6 to a certain extent.

[0135] Furthermore, a 33rd resistor R33 is connected in series between the acquisition output terminal 201 of the acquisition module 2 and the input terminal of the signal amplification module 6.

[0136] By adopting the above technical solution, the connection between the acquisition module 2 and the signal amplification module 6 becomes more reasonable.

[0137] Furthermore, the driving module 1 includes a constant current buck chip U3, and the constant current buck chip U3 has the feedback terminal 102. The constant current buck chip U3 is configured to adjust its switching duty cycle according to the voltage received by its feedback terminal 102, so as to adjust the voltage output by the driving output terminal 101.

[0138] The above technical solution makes the driving module 1 more reasonable; the constant current buck chip U3 and its peripheral circuit can realize the driving module 1; specifically, the constant current buck chip U3 adopts BP2879, and the feedback terminal 102 is formed as the FB pin of the constant current buck chip U3.

[0139] Furthermore, the constant current buck chip U3 has a current detection pin U3-1, and the acquisition voltage signal output by the acquisition module 2 is sent to the current detection pin U3-1 of the constant current buck chip U3.

[0140] The above technical solution makes the constant current step-down chip U3 more reasonable. The acquisition voltage signal output by the acquisition module 2 is sent to the current detection pin U3-1 of the constant current step-down chip U3 to report the light sensitivity.

[0141] Furthermore, the acquisition module 2 uses a resistor or a resistor assembly.

[0142] The above technical solution makes the acquisition module 2 more reasonable; the resistor component can be understood as including multiple resistors, and the multiple resistors are connected in series and / or in parallel.

[0143] Furthermore, the dimming control circuit includes a protection diode VR2 for providing input voltage clamping protection, the cathode of the protection diode VR2 being connected to the first adjustment access terminal 3021, and the anode of the protection diode VR2 being connected to the second adjustment access terminal 3022.

[0144] By adopting the above technical solution, the setting of the protection diode VR2 can protect the output of the adjustment interface 302 and effectively avoid the effects of excessive voltage output and reverse connection.

[0145] Furthermore, the protection diode VR2 is a second Zener diode.

[0146] The above technical solution makes the protection diode VR2 more reasonable.

[0147] Furthermore, the dimming control circuit includes a power module 7 for introducing electrical energy, the power module 7 having a positive power supply 701 for outputting electrical energy.

[0148] The above technical solution makes the dimming control circuit more reasonable; the power supply module 7 provides power to the drive module 1, the signal processing module 4, and the adjustment module 3.

[0149] Furthermore, the dimming control circuit includes a voltage regulator module 8 for stabilizing the voltage, and the positive power supply 701 is output to the outside through the voltage regulator module 8.

[0150] By adopting the above technical solution, the voltage regulator module 8 can stabilize the voltage, thereby ensuring a stable and reliable power supply.

[0151] Furthermore, the voltage regulator module 8 includes a fourth transistor Q4, a third Zener diode VR3, and a thirty-second resistor R32. The collector of the fourth transistor Q4 is connected to the positive terminal 701 of the power supply, the emitter of the fourth transistor Q4 forms the output terminal of the voltage regulator module 8, the base of the fourth transistor Q4 is connected to the cathode of the third Zener diode VR3, the anode of the third Zener diode VR3 is connected to the reference ground, and the thirty-second resistor R32 is connected between the collector and the base of the fourth transistor Q4.

[0152] The above technical solution makes the voltage regulator module 8 more reasonable.

[0153] Furthermore, a thirty-first capacitor C31 is connected between the output terminal of the voltage regulator module 8 and the reference ground.

[0154] The above technical solution makes the voltage regulator module 8 more reasonable.

[0155] A lighting fixture includes a dimming control circuit as described above and an illumination module for emitting light, wherein the positive terminal of the illumination module is connected to the drive output terminal 101 and the negative terminal of the illumination module is connected to a reference ground.

[0156] By adopting the above technical solution, the lamps become more reasonable, significantly reducing the risk of needing to reconfigure the circuit due to the discontinuation of dedicated chips; it also breaks the dependence on a single supplier and is low in cost; while ensuring dimming performance, it effectively solves the long-standing supply chain risks and cost problems in the field of lighting drivers.

[0157] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0158] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be defined by the scope of the claims.

Claims

1. A dimming control circuit for driving a lighting module, characterized in that, include: A drive module (1) having a drive output terminal (101) and a feedback terminal (102), the drive module (1) being configured to control the voltage output of its drive output terminal (101) according to the voltage received by its feedback terminal (102); The acquisition module (2) is connected in series in the circuit where the lighting module is located, and the feedback module is configured to convert the current flowing through it into a corresponding acquisition voltage signal and output it through its acquisition output terminal (201). The adjustment module (3) has an adjustment output terminal (301) and is configured to: respond to user operation and adjust the voltage of the adjustment signal output by the adjustment output terminal (301) according to the user operation; And a signal processing module (4), the signal processing module (4) includes a signal processing unit (401), the signal processing unit (401) has a data acquisition input terminal (4011), an adjustment input terminal (4012) and a signal processing output terminal (4013), and the signal processing unit (401) is configured to control the voltage magnitude of the processed signal output by its signal processing output terminal (4013) according to the difference between the data acquisition input terminal (4011) and the adjustment input terminal (4012); The acquisition output terminal (201) of the acquisition module (2) is connected to the acquisition input terminal (4011) of the signal processing unit (401), the adjustment output terminal (301) of the adjustment module (3) is connected to the adjustment input terminal (4012) of the signal processing unit (401), and the signal processing output terminal (4013) of the signal processing unit (401) is connected to the feedback terminal (102) of the drive module (1).

2. The dimming control circuit according to claim 1, characterized in that: The adjustment module (3) includes an adjustment interface (302) having a first adjustment access terminal (3021) and a second adjustment access terminal (3022), the second adjustment access terminal (3022) being connected to a reference ground; the adjustment interface (302) can be used to connect to at least one of an adjustable voltage DC power supply (303), a variable resistor (304), and a PWM output source (305); When the adjustment interface (302) can be used to connect to the adjustable voltage DC power supply (303), the first adjustment access terminal (3021) is used to connect to the positive terminal of the adjustable voltage DC power supply (303), the second adjustment access terminal (3022) is used to connect to the negative terminal of the adjustable voltage DC power supply (303), and the first adjustment access terminal (3021) is formed as the adjustment output terminal (301). When the adjustment interface (302) can be used to connect to the variable resistor (304), the adjustment module (3) further includes a constant current source unit (306), which is configured to output a constant current. The output terminal of the constant current source unit (306) is connected to the first adjustment access terminal (3021), the first adjustment access terminal (3021) is used to connect to one end of the variable resistor (304), the second adjustment access terminal (3022) is used to connect to the other end of the variable resistor (304), and the first adjustment access terminal (3021) is formed as the adjustment output terminal (301). When the adjustment interface (302) can be used to connect to the PWM output source (305), the adjustment module (3) further includes a conversion unit (307), which is configured to convert the PWM adjustment signal output by the PWM output source (305) into a DC voltage of the corresponding voltage and output it. The input terminal of the conversion unit (307) is connected to the first adjustment access terminal (3021), which is used to connect to the positive terminal of the PWM output source (305), and the second adjustment access terminal (3022) is used to connect to the negative terminal of the PWM output source (305). The output terminal of the conversion unit (307) is formed as the adjustment output terminal (301).

3. The dimming control circuit according to claim 2, characterized in that: The constant current source unit (306) includes a third transistor (Q3), a fortieth resistor (R40), a forty-first resistor (R41), and a voltage regulator (U5). The emitter of the third transistor (Q3) is connected to the positive terminal of the power supply (701) through the fortieth resistor (R40), and the base of the third transistor (Q3) is connected to the reference ground through the forty-first resistor (R41). The voltage regulator (U5) is connected to the base of the third transistor (Q3) to clamp its voltage. The collector of the third transistor (Q3) is formed as the output terminal of the constant current source unit (306). The voltage regulator (U5) uses a precision voltage regulator. The anode of the precision voltage regulator is connected to the base of the third transistor (Q3). The cathode of the precision voltage regulator is connected to the end of the fortieth resistor (R40) connected to the positive terminal of the power supply (701). The reference terminal of the precision voltage regulator is short-circuited to its cathode. The third transistor (Q3) is a PNP type transistor.

4. The dimming control circuit according to claim 2, characterized in that: The conversion unit (307) includes a forty-second resistor (R42) and a thirty-second capacitor (C32). One end of the forty-second resistor (R42) is formed as the input terminal of the conversion unit (307), and the other end of the forty-second resistor (R42) is connected to one end of the thirty-second capacitor (C32). The other end of the thirty-second capacitor (C32) is connected to a reference ground. The connection between the forty-second resistor (R42) and the thirty-second capacitor (C32) forms the output terminal of the conversion unit (307).

5. The dimming control circuit according to claim 1, characterized in that: The signal processing module (4) includes a first operational amplifier (U4B), which has a first non-inverting input terminal (U4B-1), a first inverting input terminal (U4B-2), and a first operational amplifier output terminal (U4B-3). The first non-inverting input terminal (U4B-1) is formed as the acquisition input terminal (4011) of the signal processing module (4), the inverting input terminal is formed as the adjustment input terminal (4012) of the signal processing module (4), and the first operational amplifier output terminal (U4B-3) is formed as the signal processing output terminal (4013) of the signal processing module (4). The signal processing module (4) includes a 36th resistor (R36) and a 30th capacitor (C30). The first inverting input terminal (U4B-2) is connected to one end of the 36th resistor (R36), the other end of the 36th resistor (R36) is connected to one end of the 30th capacitor (C30), and the other end of the 30th capacitor (C30) is connected to the output terminal (U4B-3) of the first operational amplifier. The output of the first operational amplifier (U4B-3) is output to the outside through the thirty-first resistor.

6. The dimming control circuit according to claim 1 or 5, characterized in that: Includes a blanking circuit module (5) for pulling the level of the adjustment input terminal (4012) low during the circuit startup phase; The blanking circuit module (5) includes a second controllable switch (501), a thirty-third capacitor (C33), and a thirty-ninth resistor (R39). The second controllable switch (501) has a third controllable switch terminal (5011), a fourth controllable switch terminal (5012), and a second switch control terminal (5013). The third controllable switch terminal (5011) is connected to the adjustment input terminal (4012), and the fourth controllable switch terminal (5012) is connected to the reference ground. One end of the thirty-third capacitor (C33) is connected to the positive terminal of the power supply (701), and the other end of the thirty-third capacitor (C33) is connected to the thirty-ninth resistor (R39). One end of the resistor (R39) is connected, and the other end of the 39th resistor (R39) is connected to the reference ground. The connection point between the 33rd capacitor (C33) and the 39th resistor (R39) is connected to the second switch control terminal (5013). The second controllable switch (501) is configured such that when its second switch control terminal (5013) is high, it controls the third controllable switch terminal (5011) and the fourth controllable switch terminal (5012) to connect, and when its second switch control terminal (5013) is not high, it controls the third controllable switch terminal (5011) and the fourth controllable switch terminal (5012) to disconnect. The second controllable switch (501) adopts a second MOSFET (Q2), the second MOSFET (Q2) adopts an N-type MOSFET, the drain of the second MOSFET (Q2) is formed as the third controllable switch terminal (5011), the source of the second MOSFET (Q2) is formed as the fourth controllable switch terminal (5012), and the gate of the second MOSFET (Q2) is formed as the second switch control terminal (5013).

7. The dimming control circuit according to claim 1, characterized in that: Includes a signal amplification module (6), the acquisition output terminal (201) of the acquisition module (2) is connected to the input terminal of the signal amplification module (6), the output terminal of the signal amplification module (6) is connected to the acquisition input terminal (4011) of the signal processing unit (401), and the signal amplification module (6) is configured to amplify the signal input at its input terminal and then output it through its output terminal; The signal amplification module (6) includes a second operational amplifier (U4A), which has a second non-inverting input terminal (U4A-1), a second inverting input terminal (U4A-2), and a second operational amplifier output terminal (U4A-3). The second non-inverting input terminal (U4A-1) is formed as the input terminal of the signal amplification module (6), and the second operational amplifier output terminal (U4A-3) is formed as the output terminal of the signal amplification module (6). The second inverting input terminal (U4A-2) is connected to the reference ground through a thirty-fifth resistor (R35), and a thirty-fourth resistor (R34) is connected across the second inverting input terminal (U4A-2) and the second operational amplifier output terminal (U4A-3). A twenty-ninth capacitor (C29) is connected across the second inverting input terminal (U4A-2) and the second operational amplifier output terminal (U4A-3). The output of the signal amplification module (6) is output to the outside through the thirty-eighth resistor (R38); A 33rd resistor (R33) is connected in series between the acquisition output terminal (201) of the acquisition module (2) and the input terminal of the signal amplification module (6).

8. The dimming control circuit according to claim 1, characterized in that: The driving module (1) includes a constant current buck chip (U3), and the constant current buck chip (U3) has the feedback terminal (102). The constant current buck chip (U3) is configured to adjust its switching duty cycle according to the voltage received by its feedback terminal (102) in order to adjust the voltage output by the driving output terminal (101). The constant current step-down chip (U3) has a current detection pin (U3-1), and the acquisition voltage signal output by the acquisition module (2) is sent to the current detection pin (U3-1) of the constant current step-down chip (U3). The acquisition module (2) uses a resistor or a resistor assembly.

9. The dimming control circuit according to claim 2, characterized in that: Includes a protection diode (VR2) for providing input voltage clamping protection, the cathode of which is connected to the first regulating access terminal (3021), and the anode of which is connected to the second regulating access terminal (3022); The protection diode (VR2) is a second Zener diode; The dimming control circuit includes a power module (7) for introducing electrical energy, the power module (7) having a positive power supply (701) for outputting electrical energy. The dimming control circuit includes a voltage regulator module (8) for stabilizing voltage, and the positive terminal of the power supply (701) is output to the outside through the voltage regulator module (8); The voltage regulator module (8) includes a fourth transistor (Q4), a third Zener diode (VR3), and a thirty-second resistor (R32). The collector of the fourth transistor (Q4) is connected to the positive terminal of the power supply (701), the emitter of the fourth transistor (Q4) forms the output terminal of the voltage regulator module (8), the base of the fourth transistor (Q4) is connected to the cathode of the third Zener diode (VR3), the anode of the third Zener diode (VR3) is connected to the reference ground, and the thirty-second resistor (R32) is connected across the collector and base of the fourth transistor (Q4). A 31 capacitor (C31) is connected between the output terminal of the voltage regulator module (8) and the reference ground.

10. A lamp, characterized in that: The device includes a dimming control circuit as described in any one of claims 1 to 9, and an illumination module for emitting light, wherein the positive terminal of the illumination module is connected to the drive output terminal (101), and the negative terminal of the illumination module is connected to a reference ground.

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