LED light supplementing driving circuit and LED light supplementing device

Abstract

The utility model provides an LED light supplement drive circuit and an LED light supplement device, and relates to the intelligent traffic technology field, the circuit comprises an MCU, a stroboscopic simulation drive circuit, a burst flash simulation drive circuit and a constant current control circuit, the MCU comprises a processing module and a digital-to-analog conversion module, the processing module is connected with the digital-to-analog conversion module, and the processing module is connected with the digital-to-analog conversion module. The stroboscopic simulation driving circuit is respectively connected with the processing module, the digital-to-analog conversion module and the constant current control circuit, and the burst flash simulation driving circuit is respectively connected with the processing module, the digital-to-analog conversion module and the constant current control circuit; and the constant current control circuit is connected with the LED light supplementing load. According to the utility model, the processing module and the digital-to-analog conversion module can be combined to flexibly enable the target driving circuit corresponding to the target light supplement function, and the target current signal corresponding to the LED light supplement load can be adjusted through the target adjustable voltage signal, thereby avoiding the time delay caused by the repeated power-on and power-off of the power supply module in the prior art, improving the control reliability, and at the same time, reducing the cost. A control circuit is simplified and circuit cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent transportation, in particular to an LED supplementary light driving circuit and an LED supplementary light device. Background Art

[0002] An LED (Light-Emitting Diode) supplementary light device is a key accessory in a road traffic capture system, mainly used to implement the LED stroboscopic function and the LED flash function. Among them, the LED stroboscopic function is used to synchronize with the shutter of each frame of the camera to realize the supplementary light for the live video. The LED flash function is used to perform high-brightness supplementary light when the camera captures an image, so that the camera can collect the detailed features of the vehicle, especially the face details of the driver in the vehicle. Compared with the xenon lamp used for supplementary light in the existing road traffic capture system, the LED supplementary light device can greatly reduce light pollution and avoid the impact of light pollution on the safe driving of the driver.

[0003] In the prior art, two sets of independent control feedback circuits are used to continuously power on and off the amplifier and the power supply module repeatedly to respectively implement the LED stroboscopic function and the LED flash function. However, the repeated power on and off of the power supply module during the control process will increase the control delay, thereby resulting in a low reliability of the control process, and the control circuit is complex and the circuit cost is high. Summary of the Utility Model

[0004] The utility model provides an LED supplementary light driving circuit and an LED supplementary light device to solve the defects of low reliability in the control process, complex control circuit and high circuit cost in the prior art.

[0005] The utility model provides an LED supplementary light driving circuit, including: an MCU, a stroboscopic analog driving circuit, a flash analog driving circuit and a constant current control circuit, wherein:

[0006] The MCU includes a processing module and a digital-to-analog conversion module, and the processing module is connected to the digital-to-analog conversion module; the stroboscopic analog driving circuit is respectively connected to the processing module, the digital-to-analog conversion module and the constant current control circuit, and the flash analog driving circuit is respectively connected to the processing module, the digital-to-analog conversion module and the constant current control circuit;

[0007] The processing module is configured to generate a target driving signal and control the digital-to-analog conversion module to generate a target control signal; the target driving signal is used to enable a target driving circuit corresponding to the target control signal; the target driving signal includes a stroboscopic driving signal corresponding to the stroboscopic analog driving circuit and a flash driving signal corresponding to the flash analog driving circuit; the target driving circuit includes the stroboscopic analog driving circuit or the flash analog driving circuit; the target driving circuit is configured to generate a target adjustable voltage signal based on the target control signal and the target driving signal.

[0008] The constant current control circuit is connected to the LED supplementary light load, and is configured to generate a target current signal required for the LED supplementary light load to perform a target supplementary light function corresponding to the target driving circuit based on the target adjustable voltage signal.

[0009] According to the LED supplementary light driving circuit provided by the present invention, the stroboscopic analog driving circuit includes a stroboscopic analog switch. A first control end of the processing module is connected to a first input end of the stroboscopic analog switch. The first input end of the stroboscopic analog switch is configured to receive the stroboscopic driving signal generated by the processing module. A first control end of the digital-to-analog conversion module is connected to a second input end of the stroboscopic analog switch. An output end of the stroboscopic analog switch is connected to a first input end of the constant current control circuit.

[0010] According to the LED supplementary light driving circuit provided by the present invention, the flash analog driving circuit includes a flash analog switch. A second control end of the processing module is connected to a first input end of the flash analog switch. The first input end of the flash analog switch is configured to receive the flash driving signal generated by the processing module. A second control end of the digital-to-analog conversion module is connected to a second input end of the flash analog switch. An output end of the flash analog switch is connected to a first input end of the constant current control circuit.

[0011] According to the LED supplementary light driving circuit provided by the present invention, the constant current control circuit includes a logic control circuit and an energy storage circuit, where:

[0012] A first input end of the logic control circuit serves as the first input end of the constant current control circuit, and an output end of the logic control circuit is connected to a control end of the energy storage circuit;

[0013] An input end of the energy storage circuit is connected to a commercial power supply, and an output end of the energy storage circuit is connected to the LED supplementary light load.

[0014] According to the LED supplementary lighting drive circuit provided by the present utility model, it further includes a resistor feedback circuit. The first input end of the resistor feedback circuit is connected to the sampling end of the logic control circuit. The second input end of the resistor feedback circuit is connected to the third control end of the processing module. The output end of the resistor feedback circuit is connected to the feedback detection end of the logic control circuit;

[0015] The processing module is further configured to generate a feedback control signal corresponding to the target drive circuit. The resistor feedback circuit is configured to collect the working voltage of the LED supplementary lighting load after working based on the target current signal based on the feedback control signal.

[0016] According to the LED supplementary lighting drive circuit provided by the present utility model, the resistor feedback circuit includes: MOS transistor Q1, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, and capacitor C1, where:

[0017] One end of the resistor R1 is connected to one end of the resistor R2 and serves as the first input end of the resistor feedback circuit. The other end of the resistor R2 is respectively connected to one end of the resistor R3 and one end of the resistor R4. The other end of the resistor R3 is connected to the drain of the MOS transistor Q1. The gate of the MOS transistor Q1 is connected to one end of the resistor R5 and serves as the second input end of the resistor feedback circuit. The other end of the resistor R5, the other end of the resistor R1, one end of the capacitor C1, and the source of the MOS transistor Q1 are all grounded. The other end of the resistor R4 is connected to the other end of the capacitor C1 and serves as the output end of the resistor feedback circuit;

[0018] The respective resistance values of the resistor R2 and the resistor R3 are both greater than 100 ohms, and the respective resistance values of the resistor R2 and the resistor R3 are greater than the on-resistance of the MOS transistor Q1.

[0019] According to the LED supplementary lighting drive circuit provided by the present utility model, the logic control circuit includes a buck control circuit and an energy storage switch circuit, where:

[0020] The first input end of the buck control circuit serves as the first input end of the logic control circuit. The second input end of the buck control circuit serves as the feedback detection end of the logic control circuit. The output end of the buck control circuit is connected to the input end of the energy storage switch circuit. The buck control circuit is configured to generate a logic control signal based on a target adjustable voltage signal. The logic control signal is used to control the on-off state of the energy storage switch circuit;

[0021] The first output end of the energy storage switch circuit serves as the sampling end of the logic control circuit. The second output end of the energy storage switch circuit serves as the control end of the logic control circuit.

[0022] According to the LED supplementary light driving circuit provided by the present utility model, the energy storage switch circuit includes a resistor R6, a resistor R7, a resistor R8, a diode D1 and a MOS transistor Q2, wherein:

[0023] One end of the resistor R6 is connected to one end of the resistor R7 and serves as the input end of the energy storage switch circuit. The other end of the resistor R6 is connected to the negative electrode of the diode D1. The positive electrode of the diode D1 is respectively connected to the other end of the resistor R7, one end of the resistor R8 and the gate of the MOS transistor Q2. The other end of the resistor R8 is connected to the source electrode of the MOS transistor Q2 and serves as the first output end of the energy storage switch circuit. The drain electrode of the MOS transistor Q2 serves as the second output end of the energy storage switch circuit.

[0024] According to the LED supplementary light driving circuit provided by the present utility model, the energy storage circuit includes a rectifying circuit, an energy storage sub-circuit and a connector, wherein:

[0025] The input end of the rectifying circuit is connected to the commercial power supply, and the output end of the rectifying circuit is connected to the first input end of the energy storage sub-circuit;

[0026] The second input end of the energy storage sub-circuit serves as the control end of the energy storage circuit. The output end of the energy storage sub-circuit is connected to the input end of the connector, and the output end of the connector serves as the output end of the energy storage circuit.

[0027] The present utility model also provides an LED supplementary light device, including: an LED supplementary light load and the LED supplementary light driving circuit as described in any one of the above.

[0028] For the LED supplementary light driving circuit and the LED supplementary light device provided by the present utility model, a target driving signal including a stroboscopic driving signal and a flash driving signal is generated by a processing module. Through the target driving signal, the on-off states of a stroboscopic analog driving circuit and a flash analog driving circuit are controlled, and then the target driving circuit is flexibly enabled from the stroboscopic analog driving circuit and the flash analog driving circuit. After the processing module controls a digital-to-analog conversion module to generate a target control signal, the target driving circuit generates a target adjustable voltage signal according to the target control signal and transmits the target adjustable voltage signal to a constant current control circuit. The constant current control circuit generates a target current signal required for the LED supplementary light load to execute the target supplementary light function corresponding to the target driving circuit according to the target adjustable voltage signal. In the present utility model, the target driving circuit corresponding to the target supplementary light function is flexibly enabled by combining the processing module and the digital-to-analog conversion module, and the target current signal corresponding to the LED supplementary light load is adjusted through the target adjustable voltage signal, avoiding the delay caused by repeated power-on and power-off of the power supply module, improving control reliability, and at the same time, simplifying the control circuit and reducing the circuit cost. Description of the Drawings

[0029] To more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the attached drawings required for use in the embodiments or the description of the prior art. Obviously, the attached drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other attached drawings can also be obtained based on these attached drawings.

[0030] Figure 1 It is a schematic structural diagram of the LED supplementary light driving circuit provided by the embodiment of the present utility model.

[0031] Figure 2 It is a schematic diagram of the linear relationship between the adjustable voltage signal and the current signal provided by the embodiment of the present utility model.

[0032] Figure 3 It is a circuit schematic diagram of the stroboscopic simulation driving circuit provided by the embodiment of the present utility model.

[0033] Figure 4 It is a circuit schematic diagram of the burst flash simulation driving circuit provided by the embodiment of the present utility model.

[0034] Figure 5 It is a circuit schematic diagram of the feedback control circuit provided by the embodiment of the present utility model.

[0035] Figure 6 It is a schematic structural diagram of the constant current control circuit provided by the embodiment of the present utility model.

[0036] Figure 7 It is a circuit schematic diagram of the logic control circuit provided by the embodiment of the present utility model.

[0037] Figure 8 It is a connection schematic diagram of the energy storage circuit provided by the embodiment of the present utility model.

[0038] Figure 9 It is a circuit schematic diagram of the energy storage sub - circuit provided by the embodiment of the present utility model.

[0039] Reference numerals:

[0040] 110: MCU; 111: Processing module; 112: Digital - to - analog conversion module; 120: Stroboscopic simulation driving circuit; 130: Burst flash simulation driving circuit; 140: Constant current control circuit; 141: Logic control circuit; 1411: Step - down control circuit; 1412: Energy storage switch circuit; 142: Energy storage circuit; 1421: Rectification circuit; 1422: Energy storage sub - circuit; 143: Mains power supply; 150: Resistance feedback circuit; 200: LED supplementary light load. Detailed implementation manners

[0041] To make the objectives, technical solutions, and advantages of the present utility model clearer, the technical solutions in the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0042] Aiming at the problems of low reliability in the control process, complex control circuits, and high circuit costs in the prior art, an embodiment of the present utility model provides an LED supplementary light driving circuit. Figure 1 It is a schematic structural diagram of the LED supplementary light driving circuit provided by an embodiment of the present utility model, as Figure 1 shown. The LED (Light-Emitting Diode) supplementary light driving circuit includes: an MCU 110 (Micro Controller Unit), a stroboscopic simulation driving circuit 120, a flash simulation driving circuit 130, and a constant current control circuit 140, where:

[0043] The MCU 110 includes a processing module 111 and a digital-to-analog conversion module 112, and the processing module 111 is connected to the digital-to-analog conversion module 112; the stroboscopic simulation driving circuit 120 is respectively connected to the processing module 111, the digital-to-analog conversion module 112, and the constant current control circuit 140, and the flash simulation driving circuit 130 is respectively connected to the processing module 111, the digital-to-analog conversion module 112, and the constant current control circuit 140;

[0044] The processing module 111 is used to generate a target driving signal and control the digital-to-analog conversion module 112 to generate a target control signal; the target driving signal is used to enable the target driving circuit corresponding to the target control signal; the target driving signal includes a stroboscopic driving signal MCU_LED_PS corresponding to the stroboscopic simulation driving circuit 120 and a flash driving signal MCU_LED_BS corresponding to the flash simulation driving circuit 130; the target driving circuit includes the stroboscopic simulation driving circuit 120 or the flash simulation driving circuit 130; the target driving circuit is used to generate a target adjustable voltage signal V_ADIM based on the target control signal and the target driving signal.

[0045] The constant current control circuit 140 is connected to the LED supplementary light load 200, and the constant current control circuit 140 is used to generate a target current signal required for the LED supplementary light load 200 to perform the target supplementary light function corresponding to the target driving circuit based on the target adjustable voltage signal V_ADIM.

[0046] Specifically, when the LED fill light load 200 needs to perform the target fill light function, the processing module 111 in the MCU 110 generates a stroboscopic drive signal MCU_LED_PS corresponding to the stroboscopic analog drive circuit 120 and a burst flash drive signal MCU_LED_BS corresponding to the burst flash analog drive circuit 130. Among them, the stroboscopic drive signal MCU_LED_PS can be a PWM (Pulse Width Modulation) signal with a fixed frequency and adjustable duty cycle. The stroboscopic drive signal MCU_LED_PS is synchronized with the stroboscopic signal output by the capture camera. That is, the frequency of the stroboscopic drive signal MCU_LED_PS is an integer multiple of the image frame rate of the capture camera. For example, if the image frame rate of the capture camera is 25 frames, the frequency of the stroboscopic drive signal MCU_LED_PS can be 100 Hz. The burst flash drive signal MCU_LED_BS is different from the stroboscopic drive signal MCU_LED_PS, and the burst flash drive signal MCU_LED_BS is a pulse signal.

[0047] After that, the stroboscopic drive signal MCU_LED_PS is transmitted to the stroboscopic analog drive circuit 120. The on-off state of the stroboscopic analog drive circuit 120 can be controlled by the duty cycle of the stroboscopic drive signal MCU_LED_PS. At the same time, the burst flash drive signal MCU_LED_BS is transmitted to the burst flash analog drive circuit 130. The on-off state of the burst flash analog drive circuit 130 can be controlled by the state of the burst flash drive signal MCU_LED_BS. According to the on-off states of the stroboscopic analog drive circuit 120 and the burst flash analog drive circuit 130 respectively, the corresponding target drive circuit can be enabled from the stroboscopic analog drive circuit 120 and the burst flash analog drive circuit 130. The target drive circuit can drive the LED fill light load 200 to achieve the target fill light function, and the target fill light function can be the LED stroboscopic function or the LED burst flash function. The LED stroboscopic function is used to synchronously fill light for each frame of exposure image in the video stream. The LED burst flash function is used to synchronously expose a single frame of image to achieve single-image capture. Through the captured image, the facial details of the driver in the cab can be captured through the car window. The brightness of the LED burst flash function is higher than that of the LED stroboscopic function, and the fill light effect is better.

[0048] In addition, the processing module 111 can also control a digital-to-analog converter (DAC) 112 to generate a target control signal, which can be an analog voltage signal corresponding to adjusting the brightness of the target supplementary lighting function. Then, the target control signal is transmitted to the target drive circuit. The target control signal is the stroboscopic control signal MCU_DAC_PS corresponding to the stroboscopic analog drive circuit 120 or the stroboscopic control signal MCU_DAC_BS corresponding to the flash analog drive circuit 130. After receiving the target control signal, the target drive circuit can generate a target adjustable voltage signal V_ADIM according to the analog voltage in the target control signal and the frequency in the target drive signal, and transmit the target adjustable voltage signal V_ADIM to the constant current control circuit 140. The constant current control circuit 140 can generate a corresponding target current signal according to the target adjustable voltage signal V_ADIM, and transmit the target current signal to the LED supplementary lighting load 200, so that the LED supplementary lighting load 200 executes the target supplementary lighting function.

[0049] It should be noted that, in combination with the respective states of the stroboscopic drive signal MCU_LED_PS and the flash drive signal MCU_LED_BS, it can be ensured that only one of the stroboscopic analog drive circuit 120 and the flash analog drive circuit 130 is in the enabled state. For example, when the stroboscopic drive signal MCU_LED_PS is a low-level signal and the flash drive signal MCU_LED_BS is a pulse signal, the stroboscopic analog drive circuit 120 can be controlled to be in the off state, and the flash analog drive circuit 130 can be controlled to be in the enabled state, so as to ensure that the target supplementary lighting function is the LED flash function. When the stroboscopic drive signal MCU_LED_PS is a PWM signal and the flash drive signal MCU_LED_BS is a low-level signal, the stroboscopic analog drive circuit 120 can be controlled to be in the enabled state, and the flash analog drive circuit 130 can be controlled to be in the off state, so as to ensure that the target supplementary lighting function is the LED stroboscopic function.

[0050] It should be noted that there is a linear relationship between the adjustable voltage signal input to the constant current control circuit 140 and the current signal output. Figure 2 is an exemplary schematic diagram of the linear relationship between the adjustable voltage signal and the current signal provided by the embodiment of the present invention, as Figure 2 shown, when the adjustable voltage signal is in the range of 0V to 1.5V, the output current signal linearly changes in the range of 5.5% to 90%. The value of the current signal is related to the reference voltage V REF and the value of the feedback resistor R S , and can be specifically expressed as I OUT =V REF / R S。Reference voltage V REF Generally, it can be 0.1V, 0.15V, 0.2V, etc. Within the current adjustment range corresponding to the LED stroboscopic function, I OUT =I PS MAX = 500mA. Within the current adjustment range corresponding to the LED flash function, I OUT =I BS MAX = 7A. By adjusting the value of the feedback resistor R S the value of I OUT can be changed. By adjusting the voltage value of the adjustable voltage signal, the output current can be adjusted within the linear range, and this linear range can be Figure 2 the range from 5.5% to 90% as shown. Therefore, after receiving the target adjustable voltage signal V_ADIM, the constant current control circuit 140 can adjust the target current signal within the linear range according to the target adjustable voltage signal V_ADIM.

[0051] Furthermore, Figure 3 is the circuit schematic diagram of the stroboscopic analog drive circuit provided by the embodiment of the present invention. As Figure 3 shown, the stroboscopic analog drive circuit 120 includes a stroboscopic analog switch PSK. The first control end of the processing module 111 is connected to the first input end of the stroboscopic analog switch PSK. The first input end of the stroboscopic analog switch PSK is used to receive the stroboscopic drive signal MCU_LED_PS generated by the processing module 111. The first control end of the digital-to-analog conversion module 112 is connected to the second input end of the stroboscopic analog switch PSK. The output end of the stroboscopic analog switch PSK is connected to the first input end of the constant current control circuit 140.

[0052] Furthermore, Figure 4 is the circuit schematic diagram of the flash analog drive circuit provided by the embodiment of the present invention. As Figure 4 shown, the flash analog drive circuit 130 includes a flash analog switch BSK. The second control end of the processing module 111 is connected to the first input end of the flash analog switch BSK. The first input end of the flash analog switch BSK is used to receive the flash drive signal MCU_LED_BS generated by the processing module 111. The second control end of the digital-to-analog conversion module 112 is connected to the second input end of the flash analog switch BSK. The output end of the flash analog switch BSK is connected to the first input end of the constant current control circuit 140.

[0053] Further, the LED supplementary light driving circuit further includes a resistor feedback circuit 150. The first input end of the resistor feedback circuit 150 is connected to the sampling end of the logic control circuit 141. The second input end of the resistor feedback circuit 150 is connected to the third control end of the processing module 111. The output end of the resistor feedback circuit 150 is connected to the feedback detection end of the logic control circuit 141;

[0054] The processing module 111 is further configured to generate a feedback control signal corresponding to the target driving circuit. The resistor feedback circuit 150 is configured to collect the operating voltage of the LED supplementary light load 200 after operating based on the target current signal based on the feedback control signal.

[0055] Further, Figure 5 is a circuit schematic diagram of the feedback control circuit provided by an embodiment of the present invention. As Figure 5 shown, the resistor feedback circuit 150 includes: MOS transistor Q1, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, and capacitor C1, where:

[0056] One end of the resistor R1 is connected to one end of the resistor R2 and serves as the first input end of the resistor feedback circuit 150. The other end of the resistor R2 is respectively connected to one end of the resistor R3 and one end of the resistor R4. The other end of the resistor R3 is connected to the drain of the MOS transistor Q1. The gate of the MOS transistor Q1 is connected to one end of the resistor R5 and serves as the second input end of the resistor feedback circuit 150. The other end of the resistor R5, the other end of the resistor R1, one end of the capacitor C1, and the source of the MOS transistor Q1 are all grounded. The other end of the resistor R4 is connected to the other end of the capacitor C1 and serves as the output end of the resistor feedback circuit 150;

[0057] The resistance values corresponding to the resistor R2 and the resistor R3 are both greater than 100 ohms, and the resistance values corresponding to the resistor R2 and the resistor R3 are greater than the on-resistance of the MOS transistor Q1.

[0058] Specifically, when the target supplementary light function is the LED stroboscopic function, the processing module 111 can further generate a feedback control signal that is a low-level signal, so that the MOS transistor Q1 is in the off state. At this time, the operating current sampled from the sampling end of the logic control circuit 141 returns to the analog ground terminal AGND through the resistor R1. At this time, according to the current signal I OUT =I PS MAX = 500 mA, and the reference voltage V REF is taken as 0.1 V, the resistance value of the resistor R1 can be calculated as 200 When the target fill light function is the LED flash function, the processing module 111 can also generate a feedback control signal that is a high-level signal, causing the MOS transistor Q1 to be in a conducting state. At this time, the resistor R2, the resistor R3, and the MOS transistor Q1 are connected in series and then connected in parallel with the resistor R1. However, since the resistance values corresponding to the resistor R2 and the resistor R3 are both greater than 100 , and the on-resistance of the MOS transistor Q1 is generally level, the resistance values corresponding to the resistor R2 and the resistor R3 are much greater than the on-resistance of the MOS transistor Q1. At this time, the branch composed of the resistor R2, the resistor R3, and the MOS transistor Q1 is equivalent to an open circuit state, and the working current still returns to the analog ground terminal AGND through the resistor R1. By collecting the voltage at the connection point of the resistor R2 and the resistor R3, the working voltage corresponding to the working current can be obtained. After smoothing the waveform of the working voltage through the filter circuit composed of the resistor R4 and the capacitor C1, the feedback detection terminal of the logic control circuit 141 can obtain the working voltage.

[0059] It should be noted that whether the target fill light function is the LED stroboscopic function or the LED flash function, the working current only returns to the analog ground terminal AGND through the resistor R1. Therefore, the value of the on-resistance of the MOS transistor Q1 and the characteristic that the on-resistance of the MOS transistor Q1 is easily affected by temperature have a negligible impact on the acquisition accuracy of the working voltage corresponding to the working current, thereby improving the sampling accuracy and control accuracy.

[0060] Furthermore, Figure 6 is a schematic structural diagram of the constant current control circuit provided by the embodiment of the present invention. As Figure 6 shown, the constant current control circuit 140 includes a logic control circuit 141 and an energy storage circuit 142, wherein:

[0061] The first input terminal of the logic control circuit 141 serves as the first input terminal of the constant current control circuit 140, and the output terminal of the logic control circuit 141 is connected to the control terminal of the energy storage circuit 142;

[0062] The input terminal of the energy storage circuit 142 is connected to the mains power supply 143, and the output terminal of the energy storage circuit 142 is connected to the LED fill light load 200.

[0063] Specifically, after receiving the target adjustable voltage signal V_ADIM transmitted by the target drive circuit, the logic control circuit 141 can generate a logic control signal to control the working state of the energy storage circuit 142, that is, control the energy storage circuit 142 to be in a charging state or a discharging state. After the logic control signal controls the energy storage circuit 142 to be in a conducting state, the mains power supply 143 can charge the energy storage circuit 142, and the energy storage circuit 142 discharges to the LED supplementary lighting load 200. After the logic control signal controls the energy storage circuit 142 to be in a disconnected state, the internal components of the energy storage circuit 142 discharge and discharge to the LED supplementary lighting load 200 to ensure that the LED supplementary lighting load 200 is always in a working state.

[0064] It should be noted that the logic control signal can be the signal of the MOS transistor Q2 in the logic control circuit 141. By adjusting the duty cycle or frequency of the logic control signal, the brightness required for the target supplementary lighting function corresponding to the LED supplementary lighting load 200 can be achieved. In addition, since the embodiment of the present utility model adopts a constant current control method, the brightness stability of the LED supplementary lighting load 200 when performing the target supplementary lighting function can be ensured.

[0065] Further, the logic control circuit 141 includes a buck control circuit 1411 and an energy storage switch circuit 1412, where:

[0066] The first input terminal of the buck control circuit 1411 serves as the first input terminal of the logic control circuit 141, the second input terminal of the buck control circuit 1411 serves as the feedback detection terminal of the logic control circuit 141, and the output terminal of the buck control circuit 1411 is connected to the input terminal of the energy storage switch circuit 1412; the buck control circuit 1411 is used to generate a logic control signal based on the target adjustable voltage signal V_ADIM; the logic control signal is used to control the on-off state of the energy storage switch circuit 1412;

[0067] The first output terminal of the energy storage switch circuit 1412 serves as the sampling terminal of the logic control circuit 141, and the second output terminal of the energy storage switch circuit 1412 serves as the control terminal of the logic control circuit 141.

[0068] Further, the energy storage switch circuit 1412 includes a resistor R6, a resistor R7, a resistor R8, a diode D1, and a MOS transistor Q2, where:

[0069] One end of the resistor R6 is connected to one end of the resistor R7 and serves as the input end of the energy storage switch circuit 1412. The other end of the resistor R6 is connected to the negative electrode of the diode D1. The positive electrode of the diode D1 is respectively connected to the other end of the resistor R7, one end of the resistor R8, and the gate of the MOS transistor Q2. The other end of the resistor R8 is connected to the source of the MOS transistor Q2 and serves as the first output end of the energy storage switch circuit 1412. The drain of the MOS transistor Q2 serves as the second output end of the energy storage switch circuit 1412.

[0070] Specifically, Figure 7 is a schematic diagram of the logic control circuit provided by an embodiment of the present invention. As Figure 7 shown, the logic control circuit 141 includes a buck control circuit 1411 and an energy storage switch circuit 1412. The buck control circuit 1411 includes a buck control chip U1 and the peripheral circuit of the buck control chip U1. After the 7th pin ADIM of the buck control chip U1 receives the target adjustable voltage signal V_ADIM, the buck control chip U1 can generate a logic control signal according to the linear relationship between the adjustable voltage signal and the current signal, and transmit it to the input end of the energy storage switch circuit 1412 through the 5th pin DRV of the buck control chip U1. During the period when the logic control signal is at a high-level signal, the logic control signal passes through the resistor R7 in the energy storage switch circuit 1412 to turn on the MOS transistor Q2, so that the energy storage circuit 142, the MOS transistor Q2, and the analog ground terminal AGND form a closed loop, enabling the mains power supply 143 to charge the energy storage circuit 142, and the energy storage circuit 142 to discharge to the LED supplementary lighting load 200. During the period when the logic control signal is at a low-level signal, the logic control signal passes through the resistor R6 in the energy storage switch circuit 1412 to turn on the diode D1 and control the MOS transistor Q2 to turn off. At this time, the closed loop formed by the energy storage circuit 142, the MOS transistor Q2, and the analog ground terminal AGND is disconnected, and the internal components in the energy storage circuit 142 perform rapid discharge and continue to discharge to the LED supplementary lighting load 200.

[0071] Furthermore, Figure 8 is a connection schematic diagram of the energy storage circuit provided by an embodiment of the present invention. As Figure 8 shown, the energy storage circuit 142 includes a rectification circuit 1421, an energy storage sub-circuit 1422, and a connector J1, where:

[0072] The input end of the rectification circuit 1421 is connected to the mains power supply 143, and the output end of the rectification circuit 1421 is connected to the first input end of the energy storage sub-circuit 1422;

[0073] The second input terminal of the energy storage sub - circuit 1422 serves as the control terminal of the energy storage circuit 142. The output terminal of the energy storage sub - circuit 1422 is connected to the input terminal of the connector J1, and the output terminal of the connector J1 serves as the output terminal of the energy storage circuit 142.

[0074] Specifically, the mains power supply 143 is used to provide alternating current. The rectification circuit 1421 is used to convert the alternating current into direct current, and this direct current is used to charge the energy storage sub - circuit 1422. When the LED supplementary lighting load 200 is connected to the connector J1, the energy storage sub - circuit 1422 can, according to the logic control signal, provide the target current signal required for the LED supplementary lighting load 200 to perform the target supplementary lighting function through the connector J1.

[0075] Furthermore, Figure 9 is the circuit schematic diagram of the energy storage sub - circuit provided by the embodiment of the present utility model. As Figure 9 shown, the energy storage sub - circuit 1422 includes a capacitor C6, a capacitor C7, an inductor L, and a diode D2, where: the positive electrode of the capacitor C6 is respectively connected to the negative electrode of the diode D2 and the positive electrode of the capacitor C7, and serves as the first input terminal and the first output terminal of the energy storage sub - circuit 1422. The negative electrode of the capacitor C6 is connected to the analog ground terminal AGND. The positive electrode of the diode D2 is connected to one end of the inductor L and serves as the second input terminal of the energy storage sub - circuit 1422. The other end of the inductor L is connected to the negative electrode of the capacitor C7 and serves as the second output terminal of the energy storage sub - circuit 1422. Among them, the capacitor C6, the capacitor C7, and the inductor L play a role in energy storage, and the capacitor C6 also plays a role in filtering.

[0076] During the high - level period of the target supplementary lighting function, the buck control circuit 1411 controls the energy storage switch circuit 1412 to conduct, so that the closed loop formed by the energy storage sub - circuit 1422 and the analog ground terminal AGND is conducted. At this time, the alternating current in the mains power supply 143 is converted into direct current by the rectification circuit 1421, and then the direct current passes through the capacitor C6, the capacitor C7, the inductor L, and the MOS transistor Q2 back to the analog ground terminal AGND to charge the capacitor C6, the capacitor C7, and the inductor L, while the capacitor C7 discharges to the LED supplementary lighting load 200 through the connector J1. During the low - level period of the target supplementary lighting function, the buck control circuit 1411 controls the energy storage switch circuit 1412 to disconnect, so that the closed loop formed by the energy storage sub - circuit 1422 and the analog ground terminal AGND is disconnected. At this time, the electric energy stored in the inductor L flows through the diode D2 to the capacitor C7, realizing the rapid discharge of the inductor L, and the capacitor C7 continues to discharge to the LED supplementary lighting load 200 through the connector J1.

[0077] The LED supplementary light driving circuit provided by the utility model generates a target driving signal including a stroboscopic driving signal MCU_LED_PS and a flash driving signal MCU_LED_BS through a processing module. Through the target driving signal, the on-off states of the stroboscopic analog driving circuit and the flash analog driving circuit are controlled, and then the target driving circuit is flexibly enabled from the stroboscopic analog driving circuit and the flash analog driving circuit. After the processing module controls the digital-to-analog conversion module to generate a target control signal, the target driving circuit generates a target adjustable voltage signal V_ADIM according to the target control signal, and transmits the target adjustable voltage signal V_ADIM to the constant current control circuit. The constant current control circuit generates a target current signal required for the LED supplementary light load to execute the corresponding target supplementary light function according to the target adjustable voltage signal V_ADIM. In the utility model, the target driving circuit corresponding to the target supplementary light function is flexibly enabled by combining the processing module and the digital-to-analog conversion module, and the target current signal corresponding to the LED supplementary light load is adjusted through the target adjustable voltage signal V_ADIM, avoiding the delay caused by repeated power-on and power-off of the power supply module in the prior art, improving the control reliability, and at the same time, simplifying the control circuit and reducing the circuit cost.

[0078] An embodiment of the utility model further provides an LED supplementary light device, including: an LED supplementary light load and the LED supplementary light driving circuit described in any one of the above.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. An LED supplementary light driving circuit, characterized in that, Including: MCU, stroboscopic simulation drive circuit, flash simulation drive circuit, and constant current control circuit, where: The MCU includes a processing module and a digital-to-analog conversion module, and the processing module is connected to the digital-to-analog conversion module; the stroboscopic simulation drive circuit is respectively connected to the processing module, the digital-to-analog conversion module, and the constant current control circuit, and the flash simulation drive circuit is respectively connected to the processing module, the digital-to-analog conversion module, and the constant current control circuit; The processing module is used to generate a target drive signal and control the digital-to-analog conversion module to generate a target control signal; the target drive signal is used to enable the target drive circuit corresponding to the target control signal; the target drive signal includes the stroboscopic drive signal corresponding to the stroboscopic simulation drive circuit and the flash drive signal corresponding to the flash simulation drive circuit; the target drive circuit includes the stroboscopic simulation drive circuit or the flash simulation drive circuit; the target drive circuit is used to generate a target adjustable voltage signal based on the target control signal and the target drive signal; The constant current control circuit is connected to the LED supplementary light load, and the constant current control circuit is used to generate a target current signal required for the LED supplementary light load to execute the target supplementary light function corresponding to the target drive circuit based on the target adjustable voltage signal.

2. The LED supplementary light driving circuit according to claim 1, wherein The stroboscopic simulation drive circuit includes a stroboscopic simulation switch, the first control end of the processing module is connected to the first input end of the stroboscopic simulation switch, the first input end of the stroboscopic simulation switch is used to receive the stroboscopic drive signal generated by the processing module, the first control end of the digital-to-analog conversion module is connected to the second input end of the stroboscopic simulation switch, and the output end of the stroboscopic simulation switch is connected to the first input end of the constant current control circuit.

3. The LED supplementary light driving circuit according to claim 1, wherein The flash simulation drive circuit includes a flash simulation switch, the second control end of the processing module is connected to the first input end of the flash simulation switch, the first input end of the flash simulation switch is used to receive the flash drive signal generated by the processing module, the second control end of the digital-to-analog conversion module is connected to the second input end of the flash simulation switch, and the output end of the flash simulation switch is connected to the first input end of the constant current control circuit.

4. The LED supplementary light driving circuit according to claim 1, wherein The constant current control circuit includes a logic control circuit and an energy storage circuit, where: The first input end of the logic control circuit is used as the first input end of the constant current control circuit, and the output end of the logic control circuit is connected to the control end of the energy storage circuit; The input end of the energy storage circuit is connected to the commercial power supply, and the output end of the energy storage circuit is connected to the LED supplementary light load.

5. The LED supplementary light driving circuit according to claim 4, wherein It further includes a resistor feedback circuit, the first input end of the resistor feedback circuit is connected to the sampling end of the logic control circuit, the second input end of the resistor feedback circuit is connected to the third control end of the processing module, and the output end of the resistor feedback circuit is connected to the feedback detection end of the logic control circuit; The processing module is further used to generate a feedback control signal corresponding to the target drive circuit, and the resistor feedback circuit is used to collect the working voltage of the LED supplementary light load after working based on the target current signal based on the feedback control signal.

6. The LED supplementary light driving circuit according to claim 5, wherein The resistor feedback circuit includes: MOS transistor Q1, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, and capacitor C1, where: One end of resistor R1 is connected to one end of resistor R2 and serves as the first input terminal of the resistor feedback circuit. The other end of resistor R2 is respectively connected to one end of resistor R3 and one end of resistor R4. The other end of resistor R3 is connected to the drain of MOS transistor Q1. The gate of MOS transistor Q1 is connected to one end of resistor R5 and serves as the second input terminal of the resistor feedback circuit. The other end of resistor R5, the other end of resistor R1, one end of capacitor C1, and the source of MOS transistor Q1 are all grounded. The other end of resistor R4 is connected to the other end of capacitor C1 and serves as the output terminal of the resistor feedback circuit; The respective resistance values of resistor R2 and resistor R3 are both greater than 100 ohms, and the respective resistance values of resistor R2 and resistor R3 are greater than the on-resistance of MOS transistor Q1.

7. The LED supplementary light driving circuit according to claim 4, characterized in that The logic control circuit includes a buck control circuit and an energy storage switch circuit, where: The first input terminal of the buck control circuit serves as the first input terminal of the logic control circuit. The second input terminal of the buck control circuit serves as the feedback detection terminal of the logic control circuit. The output terminal of the buck control circuit is connected to the input terminal of the energy storage switch circuit. The buck control circuit is used to generate a logic control signal based on a target adjustable voltage signal. The logic control signal is used to control the on / off state of the energy storage switch circuit; The first output terminal of the energy storage switch circuit serves as the sampling terminal of the logic control circuit. The second output terminal of the energy storage switch circuit serves as the control terminal of the logic control circuit.

8. The LED supplementary light driving circuit according to claim 7, wherein The energy storage switch circuit includes resistor R6, resistor R7, resistor R8, diode D1, and MOS transistor Q2, where: One end of resistor R6 is connected to one end of resistor R7 and serves as the input terminal of the energy storage switch circuit. The other end of resistor R6 is connected to the negative electrode of diode D1. The positive electrode of diode D1 is respectively connected to the other end of resistor R7, one end of resistor R8, and the gate of MOS transistor Q2. The other end of resistor R8 is connected to the source of MOS transistor Q2 and serves as the first output terminal of the energy storage switch circuit. The drain of MOS transistor Q2 serves as the second output terminal of the energy storage switch circuit.

9. The LED supplementary light driving circuit according to claim 4, wherein, The energy storage circuit includes a rectifier circuit, an energy storage sub-circuit, and a connector, where: The input terminal of the rectifier circuit is connected to the mains power supply. The output terminal of the rectifier circuit is connected to the first input terminal of the energy storage sub-circuit; The second input terminal of the energy storage sub-circuit serves as the control terminal of the energy storage circuit. The output terminal of the energy storage sub-circuit is connected to the input terminal of the connector. The output terminal of the connector serves as the output terminal of the energy storage circuit.

10. An LED supplementary lighting device, characterized in that, Includes: An LED supplementary light load and an LED supplementary light driving circuit according to any one of claims 1-9.

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