Drive control circuit

Abstract

This application provides a drive control circuit, which includes: a current sampling module, a drive module, an on / off control module, and a lamp module; the input terminal of the on / off control module is connected to a control signal, and the output terminal is connected to the control terminal of the drive module; the first input terminal of the drive module is connected to the output terminal of the current sampling module to receive a sampling voltage, the second input terminal is connected to a threshold voltage, and the output terminal is connected to the input terminal of the lamp module; the on / off control module outputs an on / off control voltage signal to the drive module under the action of the control signal to control the on / off state of the drive module; the drive module conducts when the on / off control voltage signal is high to illuminate the lamp module; the current output to the lamp module is adjusted under the action of the sampling voltage and the threshold voltage to adjust the brightness of the lamp module in real time or to keep the brightness of the lamp module constant; the lamp module is turned off when the on / off control voltage signal is low to extinguish the lamp module, thereby improving the real-time performance and accuracy of dimming.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and more specifically, to a drive control circuit. Background Technology

[0002] Light-emitting diodes (LEDs) are widely used in photography, videography, lighting, and live streaming lighting due to their advantages such as energy saving, long lifespan, and fast response.

[0003] Currently, in multi-channel LED driver applications, the brightness of each channel's LED beads is difficult to adjust independently, leading to uneven light mixing and affecting illumination uniformity and image quality. Simultaneously, LED driver circuits lack rapid protection mechanisms against abnormal operating conditions such as voltage fluctuations and overcurrent, easily causing LED damage and shortening their lifespan. Furthermore, LED driver circuits cannot automatically adjust the current in real time, limiting the real-time performance of dimming.

[0004] Therefore, there are certain limitations in the existing technology for driving multiple LEDs. Utility Model Content

[0005] The purpose of this application is to provide a driving control circuit to address the shortcomings of the prior art and solve the practical problem of the limitations of the prior art in driving multiple LEDs.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0007] In a first aspect, embodiments of this application provide a drive control circuit, the drive control circuit including: a current sampling module, a drive module, an on / off control module, and a lamp group module, the lamp group module including a plurality of lamp beads;

[0008] The input terminal of the on / off control module is connected to a control signal, and the output terminal of the on / off control module is connected to the control terminal of the drive module.

[0009] The first input terminal of the driving module is connected to the output terminal of the current sampling module to receive the sampling voltage provided by the current sampling module. The second input terminal of the driving module is connected to the threshold voltage. The output terminal of the driving module is connected to the input terminal of the lamp group module.

[0010] The on / off control module is used to output a high-level or low-level on / off control voltage signal to the drive module under the action of the control signal, so as to control the on / off state of the drive module.

[0011] The driving module is used to turn on when the on / off control voltage signal is high level so that each LED in the lamp module is lit; the driving module is also used to adjust the current output to the lamp module under the action of the sampling voltage and the threshold voltage so as to adjust the brightness of the lamp module in real time or keep the brightness of the lamp module constant; the driving module is also used to turn off when the on / off control voltage signal is low level so that each LED in the lamp module is turned off.

[0012] As an optional implementation, the drive module includes: a current regulation unit, a buffer unit, and a conduction unit;

[0013] The first input terminal of the current regulating unit is connected to the output terminal of the current sampling module and the input terminal of the conduction unit; the second input terminal of the current regulating unit is connected to the threshold voltage; and the output terminal of the current regulating unit is connected to the first terminal of the buffer unit.

[0014] The second end of the buffer unit is connected to the control end of the conduction unit and the output end of the on / off control module, respectively.

[0015] The output terminal of the conduction unit is connected to the input terminal of the lamp module.

[0016] As an optional implementation, the current sampling module includes: a first resistor;

[0017] One end of the first resistor is connected to the first input terminal of the current regulating unit and the input terminal of the conducting unit;

[0018] The other end of the first resistor is grounded;

[0019] The first resistor is a current sampling resistor, which is used to convert the current flowing through the first resistor into a sampling voltage and input it to the first input terminal of the current regulation unit.

[0020] As an optional implementation, the conduction unit includes: a first NMOS transistor;

[0021] The source of the first NMOS transistor is connected to the first input terminal of the current regulation unit and the output terminal of the current sampling module, respectively.

[0022] The gate of the first NMOS transistor is connected to the output terminal of the buffer unit and the output terminal of the on / off control module, respectively.

[0023] The drain of the first NMOS transistor is connected to the input terminal of the lamp module.

[0024] As an optional implementation, the buffer unit includes: a second resistor;

[0025] One end of the second resistor is connected to the output terminal of the current regulating unit;

[0026] The other end of the second resistor is connected to the control terminal of the conduction unit and the output terminal of the on / off control module, respectively.

[0027] The second resistor is a current-limiting resistor. The second resistor is used to prevent the output signal of the current regulation unit from conflicting with the output signal of the on / off control module, and to adjust the conduction slope of the conduction unit.

[0028] As an optional implementation, the current regulation unit includes: an operational amplifier and a DAC;

[0029] The input terminal of the DAC is connected to a digital signal, and the output terminal of the DAC is connected to the non-inverting input terminal of the operational amplifier.

[0030] The inverting input terminal of the operational amplifier is connected to the output terminal of the current sampling module and the input terminal of the conduction unit;

[0031] The output terminal of the operational amplifier is connected to the first terminal of the buffer unit;

[0032] The DAC is used to convert the digital signal into a threshold voltage and input it to the non-inverting input terminal of the operational amplifier;

[0033] The operational amplifier is used to adjust the current output to the lamp module in real time under the influence of the sampling voltage and the threshold voltage, so as to adjust the brightness of the lamp module in real time.

[0034] As an optional implementation, the current regulation unit includes: an operational amplifier, a third resistor, a fourth resistor, a first capacitor, and a second capacitor;

[0035] One end of the third resistor is connected to a pulse width modulation signal, and the other end of the third resistor is connected to one end of the fourth resistor and one end of the first capacitor, respectively.

[0036] The other end of the fourth resistor is connected to one end of the second capacitor and the non-inverting input terminal of the operational amplifier, respectively.

[0037] The inverting input terminal of the operational amplifier is connected to the output terminal of the current sampling module and the input terminal of the conduction unit;

[0038] The output terminal of the operational amplifier is connected to the first terminal of the buffer unit;

[0039] The other end of the first capacitor and the other end of the second capacitor are grounded;

[0040] The third resistor, the fourth resistor, the first capacitor, and the second capacitor are used to perform two-stage filtering on the pulse width modulation signal to generate the threshold voltage and input it to the non-inverting input terminal of the operational amplifier; wherein, the duty cycle of the pulse width modulation signal is positively correlated with the generated threshold voltage;

[0041] The operational amplifier is used to adjust the current output to the lamp module in real time under the influence of the sampling voltage and the threshold voltage, so as to adjust the brightness of the lamp module in real time.

[0042] As an optional implementation, the current regulation unit includes: an operational amplifier, a fifth resistor, and a sixth resistor;

[0043] One end of the fifth resistor is connected to the power supply voltage, and the other end of the fifth resistor is connected to one end of the sixth resistor and the non-inverting input terminal of the operational amplifier.

[0044] The inverting input terminal of the operational amplifier is connected to the output terminal of the current sampling module and the input terminal of the conduction unit;

[0045] The output terminal of the operational amplifier is connected to the first terminal of the buffer unit;

[0046] The other end of the sixth resistor is grounded;

[0047] The fifth resistor and the sixth resistor are used to divide the voltage to generate the threshold voltage and input it to the non-inverting input terminal of the operational amplifier;

[0048] The operational amplifier is used to control the conduction unit to output a preset constant current to the lamp module under the action of the sampling voltage and the threshold voltage, so that the brightness of the lamp module is constant.

[0049] As an optional implementation, the current regulation unit includes: a constant current controller;

[0050] The input terminal of the constant current controller is connected to the output terminal of the current sampling module and the input terminal of the conduction unit;

[0051] The output terminal of the constant current controller is connected to the first terminal of the buffer unit;

[0052] The constant current controller generates the threshold voltage internally. Under the influence of the sampling voltage and the threshold voltage, the constant current controller controls the conduction unit to output a preset constant current to the lamp module so that the brightness of the lamp module is constant.

[0053] As an optional implementation, the on / off control module includes: a logic buffer and a first diode;

[0054] The input terminal of the logic buffer is connected to a control signal, and the output terminal of the logic buffer is connected to the anode of the first diode.

[0055] The cathode of the first diode is connected to the control terminal of the drive module;

[0056] The logic buffer is used to generate an on / off control voltage signal that corresponds to the high or low level of the control signal and output it to the drive module to control the on / off state of the drive module and the on / off state of the lamp module.

[0057] The beneficial effects of this application are:

[0058] This application provides a drive control circuit. The input terminal of the on / off control module in the drive control circuit is connected to a control signal, and the output terminal is connected to the control terminal of the drive module. The first input terminal of the drive module is connected to the output terminal of the current sampling module to receive the sampling voltage provided by the current sampling module. The second input terminal of the drive module is connected to a threshold voltage, and the output terminal is connected to the input terminal of the lamp assembly module to transmit current to the lamp assembly module under the action of the sampling voltage and the threshold voltage. The on / off control module generates a high-level or low-level on / off control voltage signal under the action of the control signal and transmits it to the drive module to control the on / off state of the drive module based on the high-level or low-level on / off control voltage signal. When the drive module receives a high-level on / off control voltage signal from the on / off control module, it conducts, causing each LED in the lamp assembly module to light up. Under the action of the sampling voltage and the threshold voltage, it adjusts the current output to the lamp assembly module to adjust the brightness of the lamp assembly module in real time or maintain the brightness of the lamp assembly module at a constant brightness, avoiding brightness fluctuations caused by voltage fluctuations. The drive module turns off when it receives a low-level on / off control voltage signal from the on / off control module, thus turning off all the LEDs in the lamp module. Only when the on / off control module controls the drive module to turn on and all the LEDs in the lamp module are lit can the drive module adjust the brightness of the lamp module by regulating the current output to the lamp module, achieving precise control over the lamp module's on / off state and brightness. Attached Figure Description

[0059] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0060] Figure 1Schematic diagram of the drive control circuit provided in the embodiments of this application Figure 1 ;

[0061] Figure 2 Schematic diagram of the drive control circuit provided in the embodiments of this application Figure 2 ;

[0062] Figure 3 Schematic diagram of the drive control circuit provided in the embodiments of this application Figure 3 ;

[0063] Figure 4 Schematic diagram of the drive control circuit provided in the embodiments of this application Figure 4 ;

[0064] Figure 5 Schematic diagram of the drive control circuit provided in the embodiments of this application Figure 5 ;

[0065] Figure 6 Schematic diagram of the drive control circuit provided in the embodiments of this application Figure 6 ;

[0066] Figure 7 Schematic diagram of the drive control circuit provided in the embodiments of this application Figure 7 .

[0067] Icons: Current sampling module: 10; Drive module: 20; On / off control module: 30; Lamp group module: 40; Current regulation unit: 21; Buffer unit: 22; Conduction unit: 23; Operational amplifier: A1; Digital-to-analog converter: DAC; Logic buffer: U1; Constant current controller: U2; First NMOS transistor: N1; First resistor: R1; Second resistor: R2; Third resistor: R3; Fourth resistor: R4; Fifth resistor: R5; Sixth resistor: R5; First capacitor: C1; Second capacitor: C2; First diode: D1. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0069] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0070] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this application, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0071] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" 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 application based on the specific circumstances.

[0072] LED light sources are used in photography, videography, lighting, and live streaming supplementary lighting. Currently, in multi-channel LED driver applications, the brightness of each channel's LED beads is difficult to adjust independently, leading to uneven light mixing and affecting illumination uniformity and image quality. Simultaneously, LED driver circuits lack rapid protection mechanisms against abnormal operating conditions such as voltage fluctuations and overcurrent, easily causing LED damage and shortening their lifespan. Furthermore, LED driver circuits cannot automatically adjust current in real time, limiting the real-time performance of dimming. In other words, existing technologies for driving multi-channel LEDs have certain limitations.

[0073] Based on the aforementioned problems, this application proposes a drive control circuit to control the on / off state of LED beads. It also adjusts the brightness of the LED beads in real time by regulating the current input to the LED beads, thereby improving the real-time performance and accuracy of dimming. Furthermore, it provides independent drive control circuits for each channel of LEDs to independently control the on / off state and brightness of each channel's LED beads.

[0074] Figure 1 Schematic diagram of the drive control circuit provided in the embodiments of this application Figure 1 ,like Figure 1 As shown, the drive control circuit includes: a current sampling module 10, a drive module 20, an on / off control module 30, and a lamp group module 40, which includes multiple LEDs.

[0075] Optionally, refer to Figure 1 In the drive control circuit, the drive module 20 is connected to the current sampling module 10, the on / off control module 30, and the lamp group module 40, respectively. The drive module 20 receives the threshold voltage V. th The sampling voltage from the current sampling module 10 and the on / off control voltage signal from the on / off control module 30 control the magnitude of the current output to the lamp group module 40, thereby controlling the on / off state and brightness of the lamp group module 40. Specifically, a multi-channel drive control circuit can be set up to independently control the on / off state and brightness of multiple lamp group modules.

[0076] The input terminal of the on / off control module 30 is connected to a control signal, and the output terminal of the on / off control module 30 is connected to the control terminal of the drive module 20.

[0077] Optionally, continue to refer to Figure 1 The on / off control module 30 includes an input terminal and an output terminal. The input terminal of the on / off control module 30 receives control signals of different levels, and the output terminal of the on / off control module 30 is connected to the control terminal of the drive module 20. The on / off control module 30 performs logic control on the drive module 20 based on the received control signals of different levels.

[0078] For example, the level of the control signal can be high or low. The voltage value of the high-level control signal can be 1.8V, 3.3V or 5V, and the voltage value of the low-level control signal can be 0V.

[0079] The first input terminal of the drive module 20 is connected to the output terminal of the current sampling module 10 to receive the sampling voltage provided by the current sampling module 10. The second input terminal of the drive module 20 is connected to the threshold voltage. The output terminal of the drive module 20 is connected to the input terminal of the lamp group module 40.

[0080] Optionally, continue to refer to Figure 1 The drive module 20 includes two input terminals, one control terminal and one output terminal. The first input terminal of the drive module 20 is connected to the output terminal of the current sampling module 10 to receive the sampling voltage provided by the current sampling module 10.

[0081] The sampling voltage provided by the current sampling module 10 is the voltage generated when the current flows through the current sampling module 10. This current also flows through the lamp group module 40. In other words, the current sampling module 10 provides the sampling voltage to the drive module 20 to indicate to the drive module 20 whether there is a fluctuation in the current flowing through the lamp group module 40.

[0082] The second input terminal of the drive module 20 is connected to the threshold voltage V. th Threshold voltage V thThis is a preset reference voltage used to adjust the current flowing through the lamp module 40. The output of the drive module 20 is connected to the input of the lamp module 40 to adjust the current based on the sampled voltage and the threshold voltage V. th Under its influence, current is transmitted to the lamp module 40.

[0083] The on / off control module 30 is used to output a high-level or low-level on / off control voltage signal to the drive module 20 under the action of the control signal, so as to control the on / off of the drive module 20.

[0084] Optionally, the on / off control module 30 generates a high-level or low-level on / off control voltage signal under the action of the control signal and transmits it to the drive module 20 to control the on / off state of the drive module 20 based on the high-level or low-level on / off control voltage signal. The level of the on / off control voltage signal output by the on / off control module 30 is consistent with the level of the control signal.

[0085] Specifically, if the control signal input to the on / off control module 30 is high, the on / off control voltage signal generated by the on / off control module 30 is also high, meaning the on / off control voltage signal output by the on / off control module 30 to the drive module 20 is high, causing the drive module 20 to conduct. Conversely, if the control signal input to the on / off control module 30 is low, the on / off control voltage signal generated by the on / off control module 30 is also low, meaning the on / off control voltage signal output by the on / off control module 30 to the drive module 20 is low, causing the drive module 20 to turn off.

[0086] The driving module 20 is used to turn on when the on / off control voltage signal is high level so that each lamp in the lamp module 40 is lit; the driving module 20 is also used to adjust the current output to the lamp module 40 under the action of the sampling voltage and the threshold voltage so as to adjust the brightness of the lamp module 40 in real time or keep the brightness of the lamp module 40 constant; the driving module 20 is also used to turn off when the on / off control voltage signal is low level so that each lamp in the lamp module 40 is turned off.

[0087] Optionally, the drive module 20 turns on when it receives a high-level on / off control voltage signal from the on / off control module 30, thereby illuminating each LED in the lamp module 40. Under the influence of the sampling voltage and the threshold voltage, it adjusts the current output to the lamp module 40 to adjust the brightness of the lamp module 40 in real time or maintain a constant brightness, avoiding brightness fluctuations caused by voltage fluctuations. Specifically, the higher the current output from the drive module 20 to the lamp module 40, the higher the brightness of the lamp module 40.

[0088] When the drive module 20 receives a low-level on / off control voltage signal from the on / off control module 30, it turns off, so that each lamp in the lamp module 40 is turned off. At this time, no matter how much current the drive module 20 outputs to the lamp module 40 under the action of the sampling voltage and the threshold voltage, it cannot make each lamp in the lamp module 40 light up, and thus cannot adjust the brightness of the lamp module 40.

[0089] In other words, the on / off control voltage signal output by the on / off control module 30 to the drive module 20 has a higher priority than the current signal output by the drive module 20 to the lamp group module 40. Under the premise that the on / off control module 30 controls the drive module 20 to conduct and each lamp bead in the lamp group module 40 is lit, the drive module 20 can adjust the brightness of the lamp group module 40 by adjusting the magnitude of the current signal output to the lamp group module 40.

[0090] In this embodiment, the input terminal of the on / off control module in the drive control circuit is connected to a control signal, and the output terminal is connected to the control terminal of the drive module. The first input terminal of the drive module is connected to the output terminal of the current sampling module to receive the sampling voltage provided by the current sampling module. The second input terminal of the drive module is connected to a threshold voltage, and the output terminal is connected to the input terminal of the lamp module to transmit current to the lamp module under the action of the sampling voltage and the threshold voltage. The on / off control module generates a high-level or low-level on / off control voltage signal under the action of the control signal and transmits it to the drive module to control the on / off of the drive module based on the high-level or low-level on / off control voltage signal. When the drive module receives a high-level on / off control voltage signal from the on / off control module, it conducts to light up each lamp in the lamp module. Under the action of the sampling voltage and the threshold voltage, it adjusts the current output to the lamp module to adjust the brightness of the lamp module in real time or maintain the brightness of the lamp module at a constant brightness to avoid brightness fluctuations caused by voltage fluctuations. The drive module turns off when it receives a low-level on / off control voltage signal from the on / off control module, thus turning off all the LEDs in the lamp module. Only when the on / off control module controls the drive module to turn on and all the LEDs in the lamp module are lit can the drive module adjust the brightness of the lamp module by regulating the current output to the lamp module, achieving precise control over the lamp module's on / off state and brightness.

[0091] Figure 2 Schematic diagram of the drive control circuit provided in the embodiments of this application Figure 2 ,like Figure 2 As shown, the drive module 20 includes: a current regulation unit 21, a buffer unit 22, and a conduction unit 23.

[0092] Optionally, refer to Figure 2The drive module 20 includes three units: a current regulation unit 21, a buffer unit 22, and a conduction unit 23. The current regulation unit 21 is based on a threshold voltage V. th The sampled voltage from the current sampling module 10 generates an regulated voltage signal, which is then sent to the conduction unit 23 via the buffer unit 22 to regulate the voltage of the conduction unit 23, thereby regulating the current output from the conduction unit 23 to the lamp module 40, i.e., regulating the brightness of the lamp module 40.

[0093] The first input terminal of the current regulating unit 21 is connected to the output terminal of the current sampling module 10 and the input terminal of the conduction unit 23. The second input terminal of the current regulating unit 21 is connected to the threshold voltage. The output terminal of the current regulating unit 21 is connected to the first terminal of the buffer unit 22.

[0094] Optionally, continue to refer to Figure 2 The current regulation unit 21 includes two input terminals and one output terminal. The first input terminal of the current regulation unit 21 is connected to the input terminal of the conduction unit 23 and serves as the first input terminal of the drive module 20, connected to the output terminal of the current sampling module 10 to receive the sampling voltage from the current sampling module 10. The second input terminal of the current regulation unit 21 serves as the second input terminal of the drive module 20, receiving the threshold voltage V. th The output terminal of the current regulating unit 21 is connected to the first terminal of the buffer unit 22.

[0095] Current regulation unit 21 is based on threshold voltage V th The sampled voltage from the current sampling module 10 is used to generate an regulated voltage signal, which is then output to the buffer unit 22.

[0096] The second end of the buffer unit 22 is connected to the control end of the conduction unit 23 and the output end of the on / off control module 30, respectively; the output end of the conduction unit 23 is connected to the input end of the lamp module 40.

[0097] Optionally, continue to refer to Figure 2 The control terminal of the conducting unit 23 is connected to the second terminal of the buffer unit 22, and serves as the control terminal of the drive module 20, connected to the output terminal of the on / off control module 30, to receive the regulated voltage signal from the current regulating unit 21 transmitted by the buffer unit 22, and the on / off control voltage signal from the on / off control module 30. The output terminal of the conducting unit 23 serves as the output terminal of the drive module 20, and is connected to the input terminal of the lamp assembly module 40.

[0098] Specifically, the conduction unit 23 is turned on or off under the action of the on / off control voltage signal from the on / off control module 30, thereby controlling the lighting or extinguishing of each lamp in the lamp assembly module 40. When on, it adjusts the current output to the lamp assembly module 40 under the action of the adjusted voltage signal from the current adjustment unit 21 to adjust the brightness of the lamp assembly module 40. Specifically, the conduction unit 23 is turned on when the on / off control voltage signal from the on / off control module 30 is high, causing each lamp in the lamp assembly module 40 to light up; and turned off when the on / off control voltage signal from the on / off control module 30 is low, causing each lamp in the lamp assembly module 40 to extinguish.

[0099] When the on / off control voltage signal from the on / off control module 30 is high and the adjusted voltage signal from the current adjustment unit 21 increases, the conduction unit 23 increases the current output to the lamp module 40, thereby increasing the brightness of the lamp module 40. When the on / off control voltage signal from the on / off control module 30 is high and the adjusted voltage signal from the current adjustment unit 21 decreases, the conduction unit 23 decreases the current output to the lamp module 40, thereby decreasing the brightness of the lamp module 40.

[0100] In this embodiment, a current regulation unit, a buffer unit, and a conduction unit are included in the drive module. The first input terminal of the current regulation unit is connected to the output terminal of the current sampling module and the input terminal of the conduction unit. The second input terminal is connected to a threshold voltage, and the output terminal is connected to the first terminal of the buffer unit. The second terminal of the buffer unit is connected to the control terminal of the conduction unit and the output terminal of the on / off control module, respectively. The output terminal of the conduction unit is connected to the input terminal of the lamp module. Based on the threshold voltage and the sampling voltage from the current sampling module, the current regulation unit generates a regulated voltage signal, which is buffered by the buffer unit and then sent to the conduction unit. The conduction unit is turned on or off under the action of the on / off control voltage signal from the on / off control module, controlling the lighting or extinguishing of each lamp in the lamp module. When on, the current output to the lamp module is adjusted under the action of the regulated voltage signal from the current regulation unit to adjust the brightness of the lamp module. This achieves on / off and brightness control of the lamp module.

[0101] Figure 3 Schematic diagram of the drive control circuit provided in the embodiments of this application Figure 3 ,like Figure 3 As shown, the current sampling module 10 includes: a first resistor R1.

[0102] One end of the first resistor R1 is connected to the first input terminal of the current adjustment unit 21 and the input terminal of the conduction unit 23; the other end of the first resistor R1 is grounded.

[0103] Optionally, refer to Figure 3The current sampling module 10 includes a first resistor R1. One end of the first resistor R1 is connected to the first output terminal of the drive module 20 as the output terminal of the current sampling module 10. That is, one end of the first resistor R1 is connected to the first input terminal of the current adjustment unit 21 and the input terminal of the conduction unit 23 respectively, and the other end of the first resistor R1 is grounded.

[0104] The first resistor R1 is a current sampling resistor. The first resistor R1 is used to convert the current flowing through the first resistor R1 into a sampling voltage and input it to the first input terminal of the current adjustment unit 21.

[0105] Optionally, the first resistor R1 is a current sampling resistor, and so on. Figure 3 The current flowing through the lamp module 40 will also flow through the first resistor R1. The first resistor R1 converts the current flowing through it into a sampling voltage and inputs it to the first input terminal of the current adjustment unit 21.

[0106] The current adjustment unit 21 can determine whether there is a fluctuation in the current flowing through the lamp module 40 based on the sampled voltage, and then determine whether it is necessary to adjust the current input to the lamp module 40. In application scenarios where the lamp module 40 needs to be kept at a constant brightness, the current of the lamp module 40 can be adjusted so that the brightness of the lamp module 40 is kept at a constant brightness, thereby improving the lighting quality and stability.

[0107] Alternatively, the current regulation unit 21 can determine the magnitude of the current flowing through the lamp group module 40 based on the sampled voltage, and then base it on the threshold voltage V. th The magnitude of the current to be input to the lamp module 40 is determined so that the current output to the lamp module 40 can be actively adjusted in application scenarios where the brightness of the lamp module 40 needs to be actively adjusted, making the brightness of the lamp module 40 flexibly adjustable and improving the flexibility and accuracy of light adjustment.

[0108] In this embodiment, the current sampling module includes a first resistor. One end of the first resistor is connected to the first input terminal of the current adjustment unit and the input terminal of the conduction unit; the other end of the first resistor is grounded. The first resistor is a current sampling resistor, and the current flowing through the first resistor is the same as that of the lamp module. The first resistor converts the current flowing through it into a sampling voltage and inputs it to the first input terminal of the current adjustment unit. This allows the current adjustment unit to determine whether to adjust the current input to the lamp module based on the sampling voltage.

[0109] As an optional implementation, the conducting unit 23 includes: a first N-channel metal-oxide-semiconductor field-effect transistor (MOS), namely the first NMOS transistor N1.

[0110] The source of the first NMOS transistor N1 is connected to the first input terminal of the current regulation unit 21 and the output terminal of the current sampling module 10, respectively; the gate of the first NMOS transistor N1 is connected to the output terminal of the buffer unit 22 and the output terminal of the on / off control module 30, respectively; and the drain of the first NMOS transistor N1 is connected to the input terminal of the lamp module 40.

[0111] Optionally, continue to refer to Figure 3 The conduction unit 23 includes a first NMOS transistor N1. The source of the first NMOS transistor N1 serves as the input terminal of the conduction unit 23, and is connected to both the first input terminal of the current adjustment unit 21 and the output terminal of the current sampling module 10. The gate of the first NMOS transistor N1 serves as the control terminal of the conduction unit 23, and is connected to the output terminal of the buffer unit 22 to receive the adjusted voltage signal from the current adjustment unit 21. The gate of the first NMOS transistor N1 also serves as the control terminal of the drive module 20, and is connected to the output terminal of the on / off control module 30 to receive the on / off control voltage signal from the on / off control module 30.

[0112] Specifically, when the first NMOS transistor N1 receives a high-level on / off control voltage signal from the on / off control module 30, it conducts, illuminating each LED in the lamp module 40. Based on the adjusted voltage signal from the current adjustment unit 21, the gate voltage of the first NMOS transistor N1 is increased or decreased, thereby increasing or decreasing the current flowing to the lamp module 40, and thus adjusting the brightness of the lamp module 40. Conversely, when the first NMOS transistor N1 receives a low-level on / off control voltage signal from the on / off control module 30, it is turned off, extinguishing each LED in the lamp module 40.

[0113] In this embodiment, the conduction unit includes a first NMOS transistor. The source of the first NMOS transistor is connected to the first input terminal of the current adjustment unit and the output terminal of the current sampling module, respectively. The gate of the first NMOS transistor is connected to the output terminal of the buffer unit and the output terminal of the on / off control module, respectively. The drain of the first NMOS transistor is connected to the input terminal of the lamp module. When the first NMOS transistor receives a high-level on / off control voltage signal from the on / off control module, it conducts, causing each lamp of the lamp module to light up. Based on the adjusted voltage signal from the current adjustment unit, the gate voltage of the first NMOS transistor is increased or decreased, thereby increasing or decreasing the current flowing to the lamp module, and thus adjusting the brightness of the lamp module. When the first NMOS transistor receives a low-level on / off control voltage signal from the on / off control module, it is turned off, causing each lamp of the lamp module to turn off, thereby adjusting the on / off state and brightness of the lamp module.

[0114] As an optional implementation, the buffer unit 22 includes a second resistor R2.

[0115] One end of the second resistor R2 is connected to the output terminal of the current regulating unit 21; the other end of the second resistor R2 is connected to the control terminal of the conduction unit 23 and the output terminal of the on / off control module 30, respectively.

[0116] Optionally, continue to refer to Figure 3 The buffer unit 22 includes a second resistor R2. One end of the second resistor R2 serves as the first end of the buffer unit 22 and is connected to the output end of the current regulating unit 21 to receive the regulated voltage signal from the current regulating unit 21. The other end of the second resistor R2 serves as the second end of the buffer unit 22 and is connected to the control end of the conduction unit 23 and the output end of the on / off control module 30, respectively, to transmit the regulated voltage signal from the current regulating unit 21 to the conduction unit 23.

[0117] The second resistor R2 is a current-limiting resistor. The second resistor R2 is used to prevent the output signal of the current regulation unit 21 from conflicting with the output signal of the on / off control module 30, and to adjust the conduction slope of the conduction unit 23.

[0118] Optionally, the second resistor R2 is a current-limiting resistor. On the one hand, the second resistor R2 can prevent the regulated voltage signal from the current regulation unit 21 from conflicting with the on / off control voltage signal from the on / off control module 30, thus avoiding damage to the conduction unit 23 caused by the conflict between the two output signals.

[0119] On the other hand, the second resistor R2 can extend the charging time of the conduction unit 23, that is, the gate charging time of the first NMOS transistor N1, reduce the rise rate of the gate voltage of the first NMOS transistor N1, adjust the conduction slope of the conduction unit 23, that is, the first NMOS transistor N1, and play a buffering role for the conduction unit 23.

[0120] In this embodiment, the buffer unit includes a second resistor. One end of the second resistor is connected to the output terminal of the current regulation unit; the other end of the second resistor is connected to the control terminal of the conduction unit and the output terminal of the on / off control module, respectively. The second resistor is a current-limiting resistor to prevent damage to the conduction unit caused by conflict between the regulated voltage signal from the current regulation unit and the on / off control voltage signal from the on / off control module. Furthermore, the second resistor can extend the charging time of the conduction unit and adjust the conduction slope of the conduction unit, thus buffering the conduction unit.

[0121] As an optional implementation, the on / off control module 30 includes: a logic buffer U1 and a first diode D1.

[0122] Optionally, continue to refer to Figure 3The on / off control module 30 includes a logic buffer U1 and a first diode D1. The logic buffer U1 receives control signals of different levels and outputs an on / off control voltage signal that is consistent with the level of the control signal. The first diode D1 is used to limit the voltage of the control terminal of the conduction unit 23, that is, to limit the gate voltage of the first NMOS transistor N1, so as to prevent the gate voltage of the first NMOS transistor N1 from being too high and causing the first NMOS transistor N1 to break down.

[0123] The input terminal of the logic buffer U1 is connected to the control signal, and the output terminal of the logic buffer U1 is connected to the anode of the first diode D1; the cathode of the first diode D1 is connected to the control terminal of the drive module 20.

[0124] Optionally, continue to refer to Figure 3 The input terminal of the logic buffer U1 serves as the input terminal of the on / off control module 30, receiving the control signal. The output terminal of the logic buffer U1 is connected to the anode of the first diode D1. The cathode of the first diode D1 serves as the output terminal of the on / off control module 30, connected to the control terminal of the drive module 20, i.e., the control terminal of the conduction unit 23, which is the gate of the first NMOS transistor N1.

[0125] The logic buffer U1 is used to generate an on / off control voltage signal that corresponds to the high or low level of the control signal and output it to the drive module 20 to control the on / off state of the drive module 20 and the on / off state of the lamp module 40.

[0126] Optionally, the logic buffer U1 generates an on / off control voltage signal that is consistent with the level of the control signal based on the level of the input control signal and outputs it to the conduction unit 23 in the drive module 20 to control the on / off state of the conduction unit 23 in the drive module 20, thereby controlling the lighting and off state of each lamp in the lamp group module 40.

[0127] Specifically, when the control signal connected to the logic buffer U1 is high, the logic buffer U1 outputs a high-level on / off control voltage signal, the cathode of the first diode D1 is high, that is, the control terminal of the conduction unit 23 in the drive module 20 is high, at this time the conduction unit 23 is turned on, and each lamp bead in the lamp group module 40 is lit.

[0128] Correspondingly, when the control signal connected to the logic buffer U1 is low, the logic buffer U1 outputs a low-level on / off control voltage signal, the cathode of the first diode D1 is low, that is, the control terminal of the conduction unit 23 in the drive module 20 is low, at this time the conduction unit 23 is turned off, and each lamp bead in the lamp group module 40 is turned off.

[0129] In this embodiment, a logic buffer and a first diode are included in the on / off control module. The input terminal of the logic buffer is connected to a control signal, and the output terminal of the logic buffer is connected to the anode of the first diode; the cathode of the first diode is connected to the control terminal of the drive module. Based on the level of the input control signal, the logic buffer generates an on / off control voltage signal that matches the level of the control signal and outputs it to the drive module to control the on / off state of the drive module, thereby controlling the lighting of each LED in the lamp group module. The first diode is used to limit the voltage at the control terminal of the drive module to prevent damage to the drive module. This improves the safety of the lighting control of each LED in the lamp group module.

[0130] Figure 4 Schematic diagram of the drive control circuit provided in the embodiments of this application Figure 4 ,like Figure 4 As shown, the current regulation unit 21 includes an operational amplifier A1 and a digital to analog converter (DAC).

[0131] Optionally, refer to Figure 4 In application scenarios where the brightness of the lamp module 40 needs to be actively adjusted or the lamp module 40 needs to be set to a constant brightness, the current adjustment unit 21 includes an operational amplifier A1 and a DAC.

[0132] In applications requiring active adjustment of the brightness of the lamp module 40, the DAC provides a flexible and adjustable threshold voltage Vt to the operational amplifier A1. h This allows the operational amplifier A1 to adjust the voltage value of the adjusted voltage signal of the operational amplifier A1 in real time, thereby adjusting the current output from the conduction unit 23 to the lamp module 40 in real time, and thus achieving real-time adjustment of the brightness of the lamp module 40.

[0133] In applications where the lamp module 40 needs to be set to a constant brightness, the DAC provides a fixed threshold voltage V to the operational amplifier A1. th So that operational amplifier A1 can react to current fluctuations flowing through lamp module 40 based on the sampled voltage and a fixed threshold voltage V. th The voltage value of the adjusted voltage signal of the operational amplifier A1 is adjusted, thereby adjusting the current output of the conduction unit 23 to the lamp module 40 to maintain a constant current value, so that the brightness of the lamp module 40 is maintained at a constant brightness.

[0134] The input terminal of the DAC is connected to a digital signal, and the output terminal of the DAC is connected to the non-inverting input terminal of the operational amplifier A1; the inverting input terminal of the operational amplifier A1 is connected to the output terminal of the current sampling module 10 and the input terminal of the conduction unit 23; the output terminal of the operational amplifier A1 is connected to the first terminal of the buffer unit 22.

[0135] Optionally, continue to refer to Figure 4 Operational amplifier A1 includes a non-inverting input, an inverting input, and an output. The non-inverting input of operational amplifier A1 serves as the second input of current adjustment unit 21 and the second input of drive module 20, and is connected to a threshold voltage V. th Among them, the threshold voltage V th This is the analog signal obtained after the DAC converts the digital signal input to the analog signal into a digital signal. The inverting input of operational amplifier A1 serves as the first input of current adjustment unit 21, connected to the input of conduction unit 23, and also serves as the first input of drive module 20, connected to the output of current sampling module 10 to receive the sampled voltage from current sampling module 10. The output of operational amplifier A1 serves as the output of current adjustment unit 21, connected to the first end of buffer unit 22, so that the adjusted voltage signal can be transmitted to conduction unit 23 through buffer unit 22.

[0136] The DAC is used to convert digital signals into a threshold voltage and input it to the non-inverting input of operational amplifier A1.

[0137] Optionally, the digital signal input to the DAC can be a binary digital code. The DAC converts the input digital signal into an analog signal corresponding to the digital signal through digital-to-analog conversion and inputs it to the non-inverting input terminal of the operational amplifier A1, that is, the threshold voltage V. th The input is given to the non-inverting input of operational amplifier A1.

[0138] Operational amplifier A1 is used to adjust the current output to lamp module 40 in real time under the influence of sampling voltage and threshold voltage, so as to adjust the brightness of lamp module 40 in real time.

[0139] Optionally, operational amplifier A1 is based on the threshold voltage V applied to its non-inverting input. th The sampling voltage connected to the inverting input terminal generates an regulated voltage signal, which is transmitted to the conducting unit 23 through the buffer unit 22. The voltage of the conducting unit 23 is adjusted, thereby adjusting the current flowing from the conducting unit 23 to the lamp module 40, and finally adjusting the brightness of the lamp module 40.

[0140] Specifically, if the sampling voltage connected to the inverting input terminal of operational amplifier A1 is lower than the threshold voltage V connected to the non-inverting input terminal... th Then, the operational amplifier A1 increases the voltage value of the regulated output voltage signal, that is, increases the voltage of the conduction unit 23, thereby increasing the current flowing from the conduction unit 23 to the lamp module 40 and increasing the brightness of the lamp module 40.

[0141] Correspondingly, if the sampling voltage connected to the inverting input terminal of operational amplifier A1 is higher than the threshold voltage V connected to the non-inverting input terminal...th If the operational amplifier A1 reduces the voltage value of the regulated output voltage signal, that is, reduces the voltage of the conduction unit 23, thereby reducing the current flowing from the conduction unit 23 to the lamp module 40 and lowering the brightness of the lamp module 40.

[0142] If the sampling voltage applied to the inverting input terminal of operational amplifier A1 is equal to the threshold voltage V applied to the non-inverting input terminal... th If the voltage value of the adjusted voltage signal output by the operational amplifier A1 remains unchanged, that is, the voltage of the conducting unit 23 remains unchanged, so that the current flowing from the conducting unit 23 to the lamp module 40 remains unchanged, the drive control circuit is in a steady state, and the brightness of the lamp module 40 remains unchanged.

[0143] In applications requiring active adjustment of the brightness of the lamp module 40, the threshold voltage V input to the operational amplifier A1 can be adjusted in real time by regulating the digital signal input to the DAC. th The voltage value is adjusted, thereby adjusting the magnitude of the adjusted voltage signal output by the operational amplifier A1, which in turn adjusts the magnitude of the current flowing from the conduction unit 23 to the lamp module 40, and actively adjusts the brightness of the lamp module 40 in real time.

[0144] Alternatively, in applications where the lamp module 40 needs to be set to a constant brightness, the digital signal input to the DAC can be fixed, that is, the threshold voltage V input to the operational amplifier A1 can be fixed. th The voltage value allows operational amplifier A1 to react to current fluctuations flowing through lamp module 40 based on the sampled voltage and a fixed threshold voltage V. th The voltage value of the adjusted voltage signal output to the conduction unit 23 is adjusted, thereby adjusting the voltage of the conduction unit 23, so that the current value flowing from the conduction unit 23 to the lamp module 40 is maintained at a constant current value, thereby maintaining the brightness of the lamp module 40 at a constant brightness.

[0145] In this embodiment, an operational amplifier and a DAC are incorporated into the current adjustment unit. The DAC's input is connected to a digital signal, and its output is connected to the non-inverting input of the operational amplifier. The inverting input of the operational amplifier is connected to the output of the current sampling module and the input of the conduction unit. The output of the operational amplifier is connected to the first terminal of the buffer unit. The DAC converts the input digital signal into a threshold voltage via digital-to-analog conversion and inputs it to the non-inverting input of the operational amplifier. Based on the threshold voltage at the non-inverting input and the sampling voltage at the inverting input, the operational amplifier generates an adjusted voltage signal, which is transmitted to the conduction unit via the buffer unit. This adjusts the voltage of the conduction unit, thereby regulating the current flowing from the conduction unit to the lamp module, ultimately achieving real-time brightness adjustment of the lamp module. This enhances the flexibility of brightness adjustment for the lamp module.

[0146] Figure 5Schematic diagram of the drive control circuit provided in the embodiments of this application Figure 5 ,like Figure 5 As shown, the current adjustment unit 21 includes: operational amplifier A1, third resistor R3, fourth resistor R4, first capacitor C1 and second capacitor C2.

[0147] Optionally, refer to Figure 5 In applications where the brightness of the lamp module 40 needs to be actively adjusted or where the lamp module 40 needs to be set to a constant brightness, the current adjustment unit 21 includes an operational amplifier A1, a third resistor R3, a fourth resistor R4, a first capacitor C1, and a second capacitor C2. The third resistor R3, the fourth resistor R4, the first capacitor C1, and the second capacitor C2 perform a two-stage filter on the incoming pulse width modulation signal to generate a threshold voltage V. th .

[0148] In applications requiring active adjustment of the brightness of the lamp module 40, the third resistor R3, the fourth resistor R4, the first capacitor C1, and the second capacitor C2 provide a flexible and adjustable threshold voltage Vt to the operational amplifier A1. h The voltage value of the adjusted voltage signal of the operational amplifier A1 is adjusted in real time, thereby adjusting the current output of the conduction unit 23 to the lamp module 40 in real time, so as to realize the real-time adjustment of the brightness of the lamp module 40.

[0149] In applications where the lamp module 40 needs to be set to a constant brightness, the third resistor R3, the fourth resistor R4, the first capacitor C1, and the second capacitor C2 provide a fixed threshold voltage V to the operational amplifier A1. th So that operational amplifier A1 can react to current fluctuations flowing through lamp module 40 based on the sampled voltage and a fixed threshold voltage V. th The voltage value of the adjusted voltage signal of the operational amplifier A1 is adjusted, thereby adjusting the current output of the conduction unit 23 to the lamp module 40 to maintain a constant current value, so that the brightness of the lamp module 40 is maintained at a constant brightness.

[0150] One end of the third resistor R3 is connected to a pulse width modulation signal, and the other end of the third resistor R3 is connected to one end of the fourth resistor R4 and one end of the first capacitor C1. The other end of the fourth resistor R4 is connected to one end of the second capacitor C2 and the non-inverting input terminal of the operational amplifier A1. The other ends of the first capacitor C1 and the second capacitor C2 are grounded.

[0151] Optionally, continue to refer to Figure 5One end of the third resistor R3 is connected to the pulse width modulation signal, and the other end of the third resistor R3 is connected to one end of the fourth resistor R4 and one end of the first capacitor C1. The third resistor R3 and the first capacitor C1 form a first-stage filter circuit, used to perform first-stage filtering on the input pulse width modulation signal. The other end of the fourth resistor R4 is connected to one end of the second capacitor C2 and the non-inverting input terminal of operational amplifier A1; the other ends of the first capacitor C1 and the second capacitor C2 are grounded. The fourth resistor R4 and the second capacitor C2 form a second-stage filter circuit, used to perform second-stage filtering on the input pulse width modulation signal, generating a threshold voltage V. th It is then output to the inverting input of operational amplifier A1.

[0152] The inverting input terminal of operational amplifier A1 is connected to the output terminal of current sampling module 10 and the input terminal of conduction unit 23; the output terminal of operational amplifier A1 is connected to the first terminal of buffer unit 22.

[0153] Optionally, continue to refer to Figure 5 The inverting input of operational amplifier A1 serves as the first input of current adjustment unit 21, connected to the input of conduction unit 23, and also serves as the first input of drive module 20, connected to the output of current sampling module 10 to receive the sampled voltage from current sampling module 10. The output of operational amplifier A1 serves as the output of current adjustment unit 21, connected to the first end of buffer unit 22, so that the adjusted voltage signal can be transmitted to conduction unit 23 through buffer unit 22.

[0154] The third resistor R3, the fourth resistor R4, the first capacitor C1, and the second capacitor C2 are used to perform two-stage filtering on the pulse width modulation signal, generate a threshold voltage, and input it to the non-inverting input of the operational amplifier A1; wherein, the duty cycle of the pulse width modulation signal is positively correlated with the generated threshold voltage.

[0155] Optionally, the third resistor R3, the fourth resistor R4, the first capacitor C1, and the second capacitor C2 perform a two-stage filter on the input pulse width modulation signal to generate a threshold voltage V. th The input is given to the non-inverting input of operational amplifier A1. The third resistor R3 and the first capacitor C1 form the first-stage filter circuit, and the fourth resistor R4 and the second capacitor C2 form the second-stage filter circuit.

[0156] The threshold voltage V can be adjusted by regulating the duty cycle of the pulse width modulation signal. th The magnitude of the pulse width modulation signal. Specifically, the duty cycle of the pulse width modulation signal is related to the generated threshold voltage V. th Positive correlation; the threshold voltage V is increased by increasing the duty cycle of the pulse width modulation signal. thThe voltage value is reduced by decreasing the duty cycle of the pulse width modulation signal to decrease the threshold voltage V. th The voltage value.

[0157] Operational amplifier A1 is used to adjust the current output to lamp module 40 in real time under the influence of sampling voltage and threshold voltage, so as to adjust the brightness of lamp module 40 in real time.

[0158] Optionally, operational amplifier A1 is based on the threshold voltage V applied to its non-inverting input. th The sampling voltage connected to the inverting input terminal generates an regulated voltage signal, which is transmitted to the conducting unit 23 through the buffer unit 22. The voltage of the conducting unit 23 is adjusted, thereby adjusting the current flowing from the conducting unit 23 to the lamp module 40, and finally adjusting the brightness of the lamp module 40.

[0159] Specifically, if the sampling voltage connected to the inverting input terminal of operational amplifier A1 is lower than the threshold voltage V connected to the non-inverting input terminal... th Then, the operational amplifier A1 increases the voltage value of the regulated output voltage signal, that is, increases the voltage of the conduction unit 23, thereby increasing the current flowing from the conduction unit 23 to the lamp module 40 and increasing the brightness of the lamp module 40.

[0160] Correspondingly, if the sampling voltage connected to the inverting input terminal of operational amplifier A1 is higher than the threshold voltage V connected to the non-inverting input terminal... th If the operational amplifier A1 reduces the voltage value of the regulated output voltage signal, that is, reduces the voltage of the conduction unit 23, thereby reducing the current flowing from the conduction unit 23 to the lamp module 40 and lowering the brightness of the lamp module 40.

[0161] If the sampling voltage applied to the inverting input terminal of operational amplifier A1 is equal to the threshold voltage V applied to the non-inverting input terminal... th If the voltage value of the adjusted voltage signal output by the operational amplifier A1 remains unchanged, that is, the voltage of the conducting unit 23 remains unchanged, so that the current flowing from the conducting unit 23 to the lamp module 40 remains unchanged, the drive control circuit is in a steady state, and the brightness of the lamp module 40 remains unchanged.

[0162] In applications requiring active adjustment of the brightness of the lamp module 40, the threshold voltage V input to the operational amplifier A1 can be adjusted in real time by regulating the duty cycle of the pulse width modulation signal input to the third resistor R3. th The voltage value is adjusted, thereby adjusting the magnitude of the adjusted voltage signal output by the operational amplifier A1, which in turn adjusts the magnitude of the current flowing from the conduction unit 23 to the lamp module 40, and actively adjusts the brightness of the lamp module 40 in real time.

[0163] Alternatively, in applications where the lamp module 40 needs to be set to a constant brightness, the duty cycle of the pulse width modulation signal input to the third resistor R3 is fixed, that is, the threshold voltage V input to the operational amplifier A1 is fixed. th The voltage value allows operational amplifier A1 to react to current fluctuations flowing through lamp module 40 based on the sampled voltage and a fixed threshold voltage V. th The voltage value of the adjusted voltage signal output to the conduction unit 23 is adjusted, thereby adjusting the voltage of the conduction unit 23, so that the current value flowing from the conduction unit 23 to the lamp module 40 is maintained at a constant current value, thereby maintaining the brightness of the lamp module 40 at a constant brightness.

[0164] In this embodiment, the current adjustment unit includes an operational amplifier, a third resistor, a fourth resistor, a first capacitor, and a second capacitor. One end of the third resistor is connected to a pulse width modulation signal, and the other end is connected to one end of the fourth resistor and one end of the first capacitor. The other end of the fourth resistor is connected to one end of the second capacitor and the non-inverting input of the operational amplifier. The other ends of the first and second capacitors are grounded. The inverting input of the operational amplifier is connected to the output of the current sampling module and the input of the conduction unit. The output of the operational amplifier is connected to the first end of the buffer unit. The third resistor, the fourth resistor, the first capacitor, and the second capacitor perform two-stage filtering on the input pulse width modulation signal with adjustable duty cycle to generate a flexibly adjustable threshold voltage, which is then input to the non-inverting input of the operational amplifier. Based on the threshold voltage at the non-inverting input and the sampling voltage at the inverting input, the operational amplifier generates an adjusted voltage signal, which is transmitted to the conduction unit through the buffer unit. This adjusts the voltage of the conduction unit, thereby adjusting the current flowing from the conduction unit to the lamp module, ultimately achieving real-time adjustment of the lamp module's brightness. By flexibly adjusting the duty cycle of the pulse width modulation signal, the brightness adjustment flexibility of the lamp module is improved.

[0165] Figure 6 Schematic diagram of the drive control circuit provided in the embodiments of this application Figure 6 ,like Figure 6 As shown, the current adjustment unit 21 includes: operational amplifier A1, fifth resistor R5 and sixth resistor R6.

[0166] Optionally, refer to Figure 6 In applications where the lamp module 40 needs to be set to a constant brightness, the current adjustment unit 21 includes an operational amplifier A1, a fifth resistor R5, and a sixth resistor R6.

[0167] Among them, the fifth resistor R5 and the sixth resistor R6 generate a fixed threshold voltage V through voltage division. th A fixed threshold voltage V is provided to operational amplifier A1. thSo that operational amplifier A1 can react to current fluctuations flowing through lamp module 40 based on the sampled voltage and a fixed threshold voltage V. th The voltage value of the adjusted voltage signal of the operational amplifier A1 is adjusted, thereby adjusting the current flowing from the conduction unit 23 to the lamp module 40 to maintain a constant current value, so that the brightness of the lamp module 40 is maintained at a constant brightness.

[0168] One end of the fifth resistor R5 is connected to the power supply voltage, and the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6 and the non-inverting input terminal of the operational amplifier A1; the other end of the sixth resistor R6 is grounded.

[0169] Optionally, continue to refer to Figure 6 One end of the fifth resistor R5 is connected to the power supply voltage VDD, and the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6 and the non-inverting input terminal of the operational amplifier A1; the other end of the sixth resistor R6 is grounded.

[0170] Among them, the fifth resistor R5 and the sixth resistor R6 are high-precision voltage divider resistors used to divide the voltage to generate a fixed threshold voltage V. th .

[0171] The inverting input terminal of operational amplifier A1 is connected to the output terminal of current sampling module 10 and the input terminal of conduction unit 23; the output terminal of operational amplifier A1 is connected to the first terminal of buffer unit 22.

[0172] Optionally, continue to refer to Figure 6 The inverting input of operational amplifier A1 serves as the first input of current adjustment unit 21, connected to the input of conduction unit 23, and also serves as the first input of drive module 20, connected to the output of current sampling module 10 to receive the sampled voltage from current sampling module 10. The output of operational amplifier A1 serves as the output of current adjustment unit 21, connected to the first end of buffer unit 22, so that the adjusted voltage signal can be transmitted to conduction unit 23 through buffer unit 22.

[0173] The fifth resistor R5 and the sixth resistor R6 are used to divide the voltage to generate the threshold voltage and input it to the non-inverting input of the operational amplifier A1.

[0174] Optionally, both the fifth resistor R5 and the sixth resistor R6 are high-precision voltage divider resistors, which generate a fixed threshold voltage V through voltage division. th It is input to the non-inverting input terminal of operational amplifier A1, providing a fixed threshold voltage V to operational amplifier A1. th .

[0175] Operational amplifier A1 is used to control the conduction unit 23 to output a preset constant current to the lamp module 40 under the action of sampling voltage and threshold voltage, so that the brightness of the lamp module 40 is constant.

[0176] Optionally, operational amplifier A1 is based on a fixed threshold voltage V applied to its non-inverting input. th The sampling voltage connected to the inverting input terminal, when the sampling voltage is not equal to the fixed threshold voltage V th When the current flowing through the lamp module 40 is found to be fluctuating, an adjusted voltage signal is generated and transmitted to the conduction unit 23 through the buffer unit 22. The voltage of the conduction unit 23 is adjusted, thereby adjusting the magnitude of the current flowing from the conduction unit 23 to the lamp module 40, so that the conduction unit 23 outputs a preset constant current to the lamp module 40, and finally the brightness of the lamp module 40 is maintained at a constant brightness.

[0177] Specifically, if the sampling voltage connected to the inverting input terminal of operational amplifier A1 is lower than the fixed threshold voltage V connected to the non-inverting input terminal... th This indicates that the current flowing through the lamp module 40 has decreased, and the brightness of the lamp module 40 is lower than the constant brightness. At this time, the operational amplifier A1 increases the voltage value of the adjusted output voltage signal, that is, increases the voltage of the conduction unit 23, thereby increasing the current flowing from the conduction unit 23 to the lamp module 40, so that the current flowing from the conduction unit 23 to the lamp module 40 is maintained at the preset constant current, and the brightness of the lamp module 40 is increased to the constant brightness.

[0178] Correspondingly, if the sampling voltage connected to the inverting input terminal of operational amplifier A1 is higher than the threshold voltage V connected to the non-inverting input terminal... th This indicates that the current flowing through the lamp module 40 has increased, and the brightness of the lamp module 40 is higher than the constant brightness. At this time, the operational amplifier A1 reduces the voltage value of the regulated output voltage signal, that is, reduces the voltage of the conduction unit 23, thereby reducing the current flowing from the conduction unit 23 to the lamp module 40, so that the current flowing from the conduction unit 23 to the lamp module 40 is maintained at the preset constant current, and the brightness of the lamp module 40 is reduced to the constant brightness.

[0179] If the sampling voltage applied to the inverting input terminal of operational amplifier A1 is equal to the threshold voltage V applied to the non-inverting input terminal... th If the voltage value of the adjusted voltage signal output by the operational amplifier A1 remains unchanged, that is, the voltage of the conducting unit 23 remains unchanged, so that the current flowing from the conducting unit 23 to the lamp module 40 remains unchanged, the drive control circuit is in a steady state, and the brightness of the lamp module 40 remains unchanged.

[0180] In this embodiment, an operational amplifier, a fifth resistor, and a sixth resistor are included in the current adjustment unit. One end of the fifth resistor is connected to the power supply voltage, and the other end is connected to one end of the sixth resistor and the non-inverting input of the operational amplifier; the other end of the sixth resistor is grounded. The inverting input of the operational amplifier is connected to the output of the current sampling module and the input of the conduction unit; the output of the operational amplifier is connected to the first end of the buffer unit. The fifth and sixth resistors generate a fixed threshold voltage through voltage division and input it to the non-inverting input of the operational amplifier. When the fixed threshold voltage connected to the non-inverting input of the operational amplifier is not equal to the sampling voltage connected to the inverting input, it is determined that the current flowing through the lamp module is fluctuating. An adjusted voltage signal is generated and transmitted to the conduction unit through the buffer unit, adjusting the voltage of the conduction unit, thereby adjusting the current flowing from the conduction unit to the lamp module, so that the conduction unit outputs a preset constant current to the lamp module, ultimately maintaining the brightness of the lamp module at a constant brightness. This achieves constant brightness control of the lamp module and ensures the stability of the lighting quality.

[0181] Figure 7 Schematic diagram of the drive control circuit provided in the embodiments of this application Figure 7 ,like Figure 7 As shown, the current regulation unit includes a constant current controller U2.

[0182] Optionally, refer to Figure 7 In applications where the lamp module 40 needs to be set to a constant brightness, the current regulation unit 21 includes a constant current controller U2. The constant current controller U2 can internally generate a fixed preset threshold V. th The constant current controller U2, when the current flowing through the lamp module 40 fluctuates, determines the current based on the sampled voltage and a fixed threshold voltage V. th The voltage value of the regulated voltage signal is adjusted, thereby regulating the current flowing from the conduction unit 23 to the lamp module 40 to maintain a constant current value, so that the brightness of the lamp module 40 is maintained at a constant brightness.

[0183] The input terminal of the constant current controller U2 is connected to the output terminal of the current sampling module 10 and the input terminal of the conduction unit 23; the output terminal of the constant current controller U2 is connected to the first terminal of the buffer unit 22.

[0184] Optionally, continue to refer to Figure 5 The input terminal of the constant current controller U2 serves as the first input terminal of the current regulation unit 21, connected to the input terminal of the conduction unit 23, and also serves as the first input terminal of the drive module 20, connected to the output terminal of the current sampling module 10, to receive the sampled voltage from the current sampling module 10. The output terminal of the constant current controller U2 serves as the output terminal of the current regulation unit 21, connected to the first terminal of the buffer unit 22, so that the regulated voltage signal can be transmitted to the conduction unit 23 through the buffer unit 22.

[0185] The constant current controller U2 generates a threshold voltage. Under the influence of the sampling voltage and the threshold voltage, the constant current controller U2 controls the conduction unit 23 to output a preset constant current to the lamp module 40 so that the brightness of the lamp module 40 is constant.

[0186] Optionally, the constant current controller U2 internally generates a fixed threshold voltage V. th The constant current controller U2 is based on the input sampling voltage and its own fixed threshold voltage V. th When the sampling voltage is not equal to the fixed threshold voltage V th When the current flowing through the lamp module 40 is found to be fluctuating, an adjusted voltage signal is generated and transmitted to the conduction unit 23 through the buffer unit 22. The voltage of the conduction unit 23 is adjusted, thereby adjusting the magnitude of the current flowing from the conduction unit 23 to the lamp module 40, so that the conduction unit 23 outputs a preset constant current to the lamp module 40, and finally the brightness of the lamp module 40 is maintained at a constant brightness.

[0187] Specifically, if the sampling voltage connected to the input terminal of the constant current controller U2 is lower than the fixed threshold voltage V th This indicates that the current flowing through the lamp module 40 has decreased, and the brightness of the lamp module 40 is lower than the constant brightness. At this time, the constant current controller U2 increases the voltage value of the adjusted output voltage signal, that is, increases the voltage of the conduction unit 23, thereby increasing the current flowing from the conduction unit 23 to the lamp module 40, so that the current flowing from the conduction unit 23 to the lamp module 40 is maintained at the preset constant current, and the brightness of the lamp module 40 is increased to the constant brightness.

[0188] Correspondingly, if the sampling voltage connected to the input terminal of the constant current controller U2 is higher than the threshold voltage V... th This indicates that the current flowing through the lamp module 40 has increased, and the brightness of the lamp module 40 is higher than the constant brightness. At this time, the constant current controller U2 reduces the voltage value of the regulated output voltage signal, that is, reduces the voltage of the conduction unit 23, thereby reducing the current flowing from the conduction unit 23 to the lamp module 40, so that the current flowing from the conduction unit 23 to the lamp module 40 is maintained at the preset constant current, and the brightness of the lamp module 40 is reduced to the constant brightness.

[0189] If the sampling voltage connected to the input terminal of the constant current controller U2 is equal to the fixed threshold voltage V th If the voltage value of the regulated voltage signal output by the constant current controller U2 remains unchanged, that is, the voltage of the conducting unit 23 remains unchanged, so that the current flowing from the conducting unit 23 to the lamp module 40 remains unchanged, the drive control circuit is in a steady state, and the brightness of the lamp module 40 remains unchanged.

[0190] In this embodiment, a constant current controller is incorporated into the current regulation unit. The input terminal of the constant current controller is connected to the output terminal of the current sampling module and the input terminal of the conduction unit; the output terminal of the constant current controller is connected to the first terminal of the buffer unit. The constant current controller internally generates a fixed threshold voltage. When the input sampling voltage is not equal to its own generated fixed threshold voltage, the constant current controller determines that the current flowing through the lamp module is fluctuating, generates an regulated voltage signal, and transmits it to the conduction unit through the buffer unit. This regulates the voltage of the conduction unit, thereby adjusting the current flowing from the conduction unit to the lamp module. This ensures that the conduction unit outputs a preset constant current to the lamp module, ultimately maintaining the brightness of the lamp module at a constant level. This achieves constant brightness control of the lamp module, ensuring the stability of the lighting quality.

[0191] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A drive control circuit, characterized by comprising: include: The system includes a current sampling module, a driving module, an on / off control module, and a lamp assembly module, wherein the lamp assembly module includes multiple LEDs. The input terminal of the on / off control module is connected to a control signal, and the output terminal of the on / off control module is connected to the control terminal of the drive module. The first input terminal of the driving module is connected to the output terminal of the current sampling module to receive the sampling voltage provided by the current sampling module. The second input terminal of the driving module is connected to the threshold voltage. The output terminal of the driving module is connected to the input terminal of the lamp group module. The on / off control module is used to output a high-level or low-level on / off control voltage signal to the drive module under the action of the control signal, so as to control the on / off state of the drive module. The driving module is used to turn on when the on / off control voltage signal is high level so that each LED in the lamp module is lit; the driving module is also used to adjust the current output to the lamp module under the action of the sampling voltage and the threshold voltage so as to adjust the brightness of the lamp module in real time or keep the brightness of the lamp module constant; the driving module is also used to turn off when the on / off control voltage signal is low level so that each LED in the lamp module is turned off.

2. The drive control circuit according to claim 1, characterized by The drive module includes: a current regulation unit, a buffer unit, and a conduction unit; The first input terminal of the current regulating unit is connected to the output terminal of the current sampling module and the input terminal of the conduction unit; the second input terminal of the current regulating unit is connected to the threshold voltage; and the output terminal of the current regulating unit is connected to the first terminal of the buffer unit. The second end of the buffer unit is connected to the control end of the conduction unit and the output end of the on / off control module, respectively. The output terminal of the conduction unit is connected to the input terminal of the lamp module.

3. The drive control circuit according to claim 2, characterized by The current sampling module includes: a first resistor; One end of the first resistor is connected to the first input terminal of the current regulating unit and the input terminal of the conducting unit; The other end of the first resistor is grounded; The first resistor is a current sampling resistor, which is used to convert the current flowing through the first resistor into a sampling voltage and input it to the first input terminal of the current regulation unit.

4. The drive control circuit according to claim 2, characterized by The conduction unit includes: a first N-channel metal-oxide-semiconductor field-effect transistor (NMOS); The source of the first NMOS transistor is connected to the first input terminal of the current regulation unit and the output terminal of the current sampling module, respectively. The gate of the first NMOS transistor is connected to the output terminal of the buffer unit and the output terminal of the on / off control module, respectively. The drain of the first NMOS transistor is connected to the input terminal of the lamp module.

5. The drive control circuit according to claim 2, wherein The buffer unit includes: a second resistor; One end of the second resistor is connected to the output terminal of the current regulating unit; The other end of the second resistor is connected to the control terminal of the conduction unit and the output terminal of the on / off control module, respectively. The second resistor is a current-limiting resistor. The second resistor is used to prevent the output signal of the current regulation unit from conflicting with the output signal of the on / off control module, and to adjust the conduction slope of the conduction unit.

6. The drive control circuit according to claim 2, characterized by The current regulation unit includes: an operational amplifier and a digital-to-analog converter (DAC); The input terminal of the DAC is connected to a digital signal, and the output terminal of the DAC is connected to the non-inverting input terminal of the operational amplifier. The inverting input terminal of the operational amplifier is connected to the output terminal of the current sampling module and the input terminal of the conduction unit; The output terminal of the operational amplifier is connected to the first terminal of the buffer unit; The DAC is used to convert the digital signal into a threshold voltage and input it to the non-inverting input terminal of the operational amplifier; The operational amplifier is used to adjust the current output to the lamp module in real time under the influence of the sampling voltage and the threshold voltage, so as to adjust the brightness of the lamp module in real time.

7. The drive control circuit according to claim 2, characterized by The current regulation unit includes: an operational amplifier, a third resistor, a fourth resistor, a first capacitor, and a second capacitor; One end of the third resistor is connected to a pulse width modulation signal, and the other end of the third resistor is connected to one end of the fourth resistor and one end of the first capacitor, respectively. The other end of the fourth resistor is connected to one end of the second capacitor and the non-inverting input terminal of the operational amplifier, respectively. The inverting input terminal of the operational amplifier is connected to the output terminal of the current sampling module and the input terminal of the conduction unit; The output terminal of the operational amplifier is connected to the first terminal of the buffer unit; The other end of the first capacitor and the other end of the second capacitor are grounded; The third resistor, the fourth resistor, the first capacitor, and the second capacitor are used to perform two-stage filtering on the pulse width modulation signal to generate the threshold voltage and input it to the non-inverting input terminal of the operational amplifier; wherein, the duty cycle of the pulse width modulation signal is positively correlated with the generated threshold voltage; The operational amplifier is used to adjust the current output to the lamp module in real time under the influence of the sampling voltage and the threshold voltage, so as to adjust the brightness of the lamp module in real time.

8. The drive control circuit according to claim 2, characterized by The current regulation unit includes: an operational amplifier, a fifth resistor, and a sixth resistor; One end of the fifth resistor is connected to the power supply voltage, and the other end of the fifth resistor is connected to one end of the sixth resistor and the non-inverting input terminal of the operational amplifier. The inverting input terminal of the operational amplifier is connected to the output terminal of the current sampling module and the input terminal of the conduction unit; The output terminal of the operational amplifier is connected to the first terminal of the buffer unit; The other end of the sixth resistor is grounded; The fifth resistor and the sixth resistor are used to divide the voltage to generate the threshold voltage and input it to the non-inverting input terminal of the operational amplifier; The operational amplifier is used to control the conduction unit to output a preset constant current to the lamp module under the action of the sampling voltage and the threshold voltage, so that the brightness of the lamp module is constant.

9. The drive control circuit according to claim 2, characterized by The current regulation unit includes: a constant current controller; The input terminal of the constant current controller is connected to the output terminal of the current sampling module and the input terminal of the conduction unit; The output terminal of the constant current controller is connected to the first terminal of the buffer unit; The constant current controller generates the threshold voltage internally. Under the influence of the sampling voltage and the threshold voltage, the constant current controller controls the conduction unit to output a preset constant current to the lamp module so that the brightness of the lamp module is constant.

10. The drive control circuit according to claim 1, characterized by The on / off control module includes: a logic buffer and a first diode; The input terminal of the logic buffer is connected to a control signal, and the output terminal of the logic buffer is connected to the anode of the first diode. The cathode of the first diode is connected to the control terminal of the drive module; The logic buffer is used to generate an on / off control voltage signal that corresponds to the high or low level of the control signal and output it to the drive module to control the on / off state of the drive module and the on / off state of the lamp module.

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