Light supplement control circuit suitable for high-power laser illuminator

Abstract

The utility model discloses a light supplement control circuit suitable for a high-power laser illuminator, which comprises a single-chip microcomputer main control circuit, and a working power supply module, a communication module, a stepping motor driving module, a laser light supplement lamp driving circuit and the like which are connected with the single-chip microcomputer main control circuit. Wherein the communication module is integrated with a plurality of communication interfaces, so that a plurality of communication modes are supported, the compatibility is strong, the adaptation is convenient, and the selection is flexible. And the working power supply module comprises a delay starting circuit, so that the influence on an external power supply caused by overlarge peak current at the moment of power-on can be avoided. In addition, the single-chip microcomputer and the DC / DC constant current chip with large current output enable the output current to be adjustable and the power of the light supplement lamp to be adjustable, so that the light supplement distance can be controlled by a client through an instruction; three dimming modes are achieved through the single chip microcomputer, the DC / DC constant current chip with large current output and the optocoupler circuit, and a user can select the needed light emitting mode, pulse duty ratio, frequency and the like according to corresponding instructions.

Description

Technical Field

[0001] This utility model relates to the field of laser illuminators for nighttime supplementary lighting of long-range cameras, and in particular to a supplementary lighting control circuit suitable for high-power laser illuminators. Background Technology

[0002] Long-range telephoto cameras and high-definition cameras are widely used in scenarios such as highways, transportation hubs, and large event venues. When used at night, supplemental lighting is usually required to ensure the quality of image or video capture. Existing products mainly have the following problems: First, the dimming mode is limited, the dimming is non-linear and has poor precision, and PWM dimming is prone to flickering; second, the excessive peak current surge at the moment of power-on causes interference to the external power supply; third, the communication and light output methods with cameras / camcorders are incompatible, resulting in high secondary development costs. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, a supplementary lighting control circuit suitable for high-power laser illuminators is proposed.

[0004] A supplementary lighting control circuit suitable for high-power laser illuminators, applied to laser illuminators, includes: a microcontroller main control circuit, and a power supply module, a communication module, a stepper motor drive module, and a laser supplementary lighting drive circuit connected to the microcontroller main control circuit; wherein...

[0005] The communication module integrates any one or more of the following interfaces: UART, RS485, RS232, and RS422.

[0006] The stepper motor drive module is used to drive the stepper motor to work; the laser fill light drive circuit is used to drive the LED fill light to work.

[0007] The power supply module includes a DC / DC constant current chip and a DC / DC constant voltage chip; the DC / DC constant current chip and the DC / DC constant voltage chip are used together to limit the output power supply range of the power supply module.

[0008] The microcontroller main control circuit and the DC / DC constant current chip are used together to limit the adjustable output current, limit the adjustable power of the LED fill light, and control the fill light distance of the LED fill light through the instructions of the preset client.

[0009] The microcontroller main control circuit, the DC / DC constant current chip, and the preset optocoupler circuit are used together to limit the dimming mode to any one or more of the following: command signal PWM pulse dimming, external analog voltage signal dimming, and hybrid dimming; the hybrid dimming is a combination of command signal PWM pulse dimming and external analog voltage signal dimming.

[0010] Preferably, the system further includes a cooling fan power supply module; the cooling fan power supply module includes a wide-voltage input power supply IC, and a first eight-resistor and a first nine-resistor electrically connected to the wide-voltage input power supply IC; the wide-voltage input power supply IC is used to limit the operating voltage of the cooling fan; or, the cooling fan power supply module includes a wide-voltage input power supply IC, and a second four-capacitor, a third three-capacitor, and a third four-capacitor electrically connected to the wide-voltage input power supply IC; the wide-voltage input power supply IC is used to limit the simultaneous operation of three cooling fans.

[0011] Preferably, it also includes an external interface module; the external interface module includes an external button control interface.

[0012] Preferably, the stepper motor is a four-wire stepper motor 32 / 1, and the stepper motor drive module and the preset optocoupler circuit are used together to limit the zoom range of the lens.

[0013] Preferably, it also includes a programming interface electrically connected to the microcontroller's main control circuit.

[0014] Preferably, it also includes a temperature detection interface electrically connected to the microcontroller main control circuit.

[0015] Preferably, it also includes a photosensitive detection interface electrically connected to the microcontroller main control circuit.

[0016] Preferably, it also includes an adjustment bracket control interface electrically connected to the microcontroller main control circuit.

[0017] Preferably, the power supply module further includes a delayed start circuit and a secondary step-down circuit; the delayed start circuit includes at least a second transistor disposed at the output terminal of a preset external input DC power supply, the second transistor being used for delayed start; the secondary step-down circuit is used to step down the voltage passing through the second transistor twice to obtain the desired voltage for the microcontroller main control circuit, the communication module, and the stepper motor drive module.

[0018] The supplementary lighting control circuit for high-power laser illuminators provided by this utility model has the following advantages compared with the prior art:

[0019] 1) Three dimming modes can be achieved through the microcontroller main control circuit, DC / DC constant current chip and preset optocoupler circuit: command signal PWM pulse dimming, external analog voltage signal dimming and hybrid dimming; allowing users to select the light output mode they need according to the corresponding command, and the pulse duty cycle and frequency can be set according to the range value, which solves the problems of single dimming mode, non-linear dimming, poor accuracy and PWM dimming that easily causes flicker in existing products.

[0020] 2) It integrates UART, RS485, RS232 and RS422 interfaces, making the communication method selectable. Users can flexibly choose the appropriate communication method according to their needs. The circuit has strong versatility and wide compatibility.

[0021] 3) The microcontroller main control circuit and the DC / DC constant current chip with high current output limit the adjustable output current and the adjustable power of the fill light, so that the user can control the fill light distance through commands on the preset client.

[0022] 4) Adding a delayed start circuit at the input power supply can avoid the impact of excessive peak current at the moment of power-on on the external power supply. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the working power supply module in Embodiment 1 of this utility model;

[0024] Figure 2 This is a schematic diagram of the communication module in Embodiment 1 of this utility model;

[0025] Figure 3 This is a schematic diagram of the stepper motor drive module in Embodiment 1 of this utility model;

[0026] Figure 4 This is a schematic diagram of the power supply module for the cooling fan in Embodiment 1 of this utility model;

[0027] Figure 5 This is a schematic diagram of the laser fill light driving circuit in Embodiment 1 of this utility model;

[0028] Figure 6 This is a schematic diagram of the microcontroller main control circuit in Embodiment 1 of this utility model;

[0029] Figure 7 This is a schematic diagram of the working power supply module in Embodiment 2 of this utility model;

[0030] Figure 8 This is a schematic diagram of the communication module in Embodiment 2 of this utility model;

[0031] Figure 9 This is a schematic diagram of the stepper motor drive module in Embodiment 2 of this utility model;

[0032] Figure 10 This is a schematic diagram of the power supply module for the cooling fan in Embodiment 2 of this utility model;

[0033] Figure 11 This is a schematic diagram of the laser fill light driving circuit in Embodiment 2 of this utility model;

[0034] Figure 12 This is a schematic diagram of the microcontroller main control circuit in Embodiment 2 of this utility model;

[0035] Figure 13 This is a schematic diagram of the external button control interface in an embodiment of this utility model;

[0036] Figure 14 This is a schematic diagram of the temperature detection interface in an embodiment of this utility model;

[0037] Figure 15 This is a schematic diagram of the programming interface in an embodiment of this utility model;

[0038] Figure 16 This is a schematic diagram of the photosensitive detection interface in an embodiment of this utility model;

[0039] Figure 17 This is a schematic diagram of the control port of the adjustment bracket in an embodiment of this utility model. Detailed Implementation

[0040] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0041] Example 1 provides a supplementary lighting control circuit suitable for high-power laser illuminators, supporting 2-18W power laser illuminators. It includes a microcontroller main control circuit, as well as a working power supply module, a communication module, a stepper motor drive module, a laser supplementary lighting drive circuit, and a cooling fan power supply module connected to the microcontroller main control circuit.

[0042] Among them, the working power supply module is as follows Figure 1 As shown, it includes a delayed start circuit and a secondary step-down circuit; the delayed start circuit includes at least a second transistor Q2 located at the output terminal of a preset external input DC power supply, and the second transistor Q2 is used for delayed start; the secondary step-down circuit is used to step down the voltage through the second transistor Q2 twice to obtain the desired voltage for the microcontroller main control circuit, communication module and stepper motor drive module.

[0043] Specifically, the preset external input DC power supply of 24V is delayed and started by Q2, which can solve the interference caused by the inrush current at the moment of power-on. The secondary step-down circuit includes U2 and U4. After the external input power supply is stepped down to 5V by U2, the 5V is further stepped down to 3.3V by U4, which can provide a stable power supply voltage for the product's main control chip, communication chip, and motor drive chip.

[0044] Communication modules such as Figure 2 As shown, it supports RS485 interface communication, and supports baud rate ranges: low speed (1200, 2400, 4800), medium speed (9600, 19200), and high speed (38400, 57600, 115200).

[0045] Stepper motor drive module such as Figure 3 As shown, the stepper motor is preferably a four-wire stepper motor 32 / 1, and the stepper motor drive module and the preset optocoupler circuit are used together to limit the zoom range of the lens.

[0046] Cooling fan power supply module such as Figure 4 As shown, the cooling fan power supply module includes a DC / DC power chip U3, i.e., a wide voltage input power IC with a wide voltage range of 12-45V; different output voltages can be obtained by adjusting the values ​​of the first eight resistor R18 and the first nine resistor R19 to meet the needs of fans with different voltages. In addition, the start / stop of the fan is controlled by the main control chip (microcontroller main control circuit).

[0047] Laser fill light driver circuit, such as Figure 5 As shown, it features a wide input voltage range and employs a hysteresis-based constant off-time operating mode, eliminating the need for external compensation design and simplifying external components. Its output current capability can be adjusted via external resistors R1 and R2 with different values, or by adjusting the voltage on the analog dimming control pin IADJ. Its output current capability can reach 25A, and it flexibly controls LED dimming through input PWM signals. The laser fill light driver circuit exhibits excellent linearity and stable constant current characteristics, enabling precise dimming and stable operation under harsh power supply conditions. Furthermore, system computation optimization is performed for low-grayscale dimming characteristics, achieving flicker-free low-grayscale dimming and providing better linearity dimming characteristics for the LED.

[0048] Microcontroller main control circuit such as Figure 6 As shown, the signal processing and signal control are performed on the working power supply section, communication section, four-wire stepper motor 32 / 1 high-precision drive section, cooling fan power supply section, high-power laser fill light drive circuit and external interface section.

[0049] In this embodiment, the microcontroller and high-current output DC / DC constant current chip allow for adjustable output current and adjustable fill light power, and enable the client to control the fill light distance via commands. Three dimming modes are achieved using the microcontroller, high-current output DC / DC constant current chip, and optocoupler circuit: command signal PWM pulse dimming, external analog voltage signal dimming, and a hybrid dimming based on the former two. This allows users to select their desired light output mode according to corresponding commands; the pulse duty cycle and frequency can be set within a range. The DC / DC constant voltage chip and high-current output DC / DC constant current chip increase the power supply range and flexibility. Adding a delayed start circuit at the input power supply resolves the impact of excessive peak current at power-on on the external power supply. Furthermore, with wide voltage supply, the cooling fan does not need to use a fan with a different voltage depending on the supply voltage; the wide voltage input range has been increased from 12V–27V to 12V–45V.

[0050] Example 2 provides a supplementary lighting control circuit suitable for high-power laser illuminators, supporting 20-80W power laser illuminators. It includes a microcontroller main control circuit, as well as a working power supply module, a communication module, a stepper motor drive module, a laser supplementary lighting drive circuit, and a cooling fan power supply module connected to the microcontroller main control circuit.

[0051] Among them, the working power supply module is as follows Figure 7 As shown, this is the 5V and 3.3V power supply section, which mainly provides stable power voltage for the microcontroller main control chip, communication chip, and motor drive chip.

[0052] Communication modules such as Figure 8 As shown, it integrates UART, RS485, RS422, and RS232 interfaces, supporting baud rates of: low speed (1200, 2400, 4800), medium speed (9600, 19200), and high speed (38400, 57600, 115200). The communication circuit uses an isolated power supply, while the logic section uses a 3.3V power supply.

[0053] Stepper motor drive module such as Figure 9 As shown, a high-precision four-wire stepper motor 32 / 1 is used, which, together with an optocoupler switch circuit, forms the zoom function of the lens.

[0054] Cooling fan power supply module such as Figure 10As shown, the cooling fan power supply module includes a DC / DC power chip U3 with a wide input voltage range of 12-36V and an output of 12V, making it a wide-input power IC. The second four-capacitor C24, the third three-capacitor C33, and the third four-capacitor C34, connected to U3, are connected in parallel to the cooling fans, allowing for the simultaneous operation of three external 12V fans. Furthermore, the fan start / stop is controlled by the main control chip (microcontroller main control circuit).

[0055] Laser fill light driver circuit, such as Figure 11 As shown, it has a wide input voltage range, large output current, DAC output current regulation, main control chip output PWM signal to control current pulse output, and optocoupler circuit to receive external PWM signal to control current pulse output.

[0056] Microcontroller main control circuit such as Figure 12 As shown, the core control section mainly performs signal processing and control for the power supply, communication section, 32 / 1 high-precision four-wire stepper motor drive section, cooling fan power supply section, high-power laser fill light drive circuit and external interface section.

[0057] In this embodiment, the microcontroller and high-current output DC / DC constant current chip allow for adjustable output current and adjustable supplementary light power, and enable the client to control the supplementary light distance via commands. Three dimming modes are achieved through the microcontroller, high-current output DC / DC constant current chip, and optocoupler circuit: command signal PWM pulse dimming, external analog voltage signal dimming, and a hybrid dimming based on the former two. This allows users to select their desired light output mode according to corresponding commands, and the pulse duty cycle and frequency can be set within a range. The use of DC / DC constant voltage chip and high-current output DC / DC constant current chip increases the power supply range and flexibility. An integrated solution consisting of a microcontroller, UART communication chip, RS485 communication chip, RS232 communication chip, and RS422 communication chip allows for selectable communication methods. Users can flexibly choose the appropriate communication method according to their needs, resulting in a highly versatile and compatible circuit.

[0058] Furthermore, based on the two embodiments described above, the system also includes an external interface module, a programming interface, a temperature detection interface, a photosensor interface, and an adjustment bracket control interface, all of which can be flexibly configured according to actual needs. The external interface module includes an external button control interface for connecting external buttons, facilitating user operation of the laser illuminator. The programming interface is used for on-site firmware updates and upgrades. The temperature detection interface and photosensor interface are used to connect external temperature and photosensor sensors, respectively. The adjustment bracket control interface is used to connect external mechanical motor components related to the laser illuminator bracket, controlling the bracket's movement.

[0059] Taking Example 2 as an example, the implementation principle diagram of the external interface module, the programming interface, the temperature detection interface, the photosensitive detection interface, and the adjustment bracket control interface is as follows: Figures 13 to 17 As shown.

[0060] The above is a description of the present utility model to help understand it; however, the implementation of the present utility model is not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A light supplement control circuit suitable for a high-power laser luminaire, applied to a laser luminaire, characterized in that, include: The system includes a microcontroller main control circuit, and a power supply module, a communication module, a stepper motor drive module, and a laser fill light drive circuit connected to the microcontroller main control circuit; wherein, The communication module integrates any one or more of the following interfaces: UART, RS485, RS232, and RS422. The stepper motor drive module is used to drive the stepper motor to work; the laser fill light drive circuit is used to drive the LED fill light to work. The power supply module includes a DC / DC constant current chip and a DC / DC constant voltage chip; the DC / DC constant current chip and the DC / DC constant voltage chip are used together to limit the output power supply range of the power supply module. The microcontroller main control circuit and the DC / DC constant current chip are used together to limit the adjustable output current, limit the adjustable power of the LED fill light, and control the fill light distance of the LED fill light through the instructions of the preset client. The microcontroller main control circuit, the DC / DC constant current chip, and the preset optocoupler circuit are used together to limit the dimming mode to any one or more of the following: command signal PWM pulse dimming, external analog voltage signal dimming, and hybrid dimming; the hybrid dimming is a combination of command signal PWM pulse dimming and external analog voltage signal dimming.

2. The light supplement control circuit suitable for use in a high-power laser luminaire according to claim 1, wherein, It also includes a cooling fan power supply module; the cooling fan power supply module includes a wide-voltage input power supply IC, and a first eight-resistor and a first nine-resistor electrically connected to the wide-voltage input power supply IC; the wide-voltage input power supply IC is used to limit the operating voltage of the cooling fan; or, the cooling fan power supply module includes a wide-voltage input power supply IC, and a second four-capacitor, a third three-capacitor, and a third four-capacitor electrically connected to the wide-voltage input power supply IC; the wide-voltage input power supply IC is used to limit the simultaneous operation of three cooling fans.

3. The light supplement control circuit suitable for use in a high-power laser illuminator according to claim 1, wherein It also includes an external interface module; the external interface module includes an external button control interface.

4. The light supplement control circuit suitable for use in a high-power laser illuminator according to claim 1, wherein The stepper motor is a four-wire stepper motor 32 / 1, and the stepper motor drive module and the preset optocoupler circuit are used together to limit the zoom range of the lens.

5. The light supplement control circuit suitable for use in a high-power laser illuminator according to claim 1, wherein It also includes a programming interface that is electrically connected to the microcontroller's main control circuit.

6. The light supplement control circuit suitable for use in a high-power laser illuminator according to claim 1, wherein It also includes a temperature detection interface electrically connected to the microcontroller main control circuit.

7. The supplementary lighting control circuit for high-power laser illuminators as described in claim 1, characterized in that, It also includes a photosensitive detection interface that is electrically connected to the microcontroller main control circuit.

8. The light supplement control circuit suitable for use in a high-power laser illuminator according to claim 1, wherein, It also includes an adjustment bracket control interface that is electrically connected to the microcontroller main control circuit.

9. The light supplement control circuit suitable for use in a high-power laser illuminator according to any one of claims 1 to 8, wherein The power supply module further includes a delayed start circuit and a secondary step-down circuit; the delayed start circuit includes at least a second transistor disposed at the output terminal of a preset external input DC power supply, the second transistor being used for delayed start; the secondary step-down circuit is used to step down the voltage passing through the second transistor twice to obtain the desired voltage for the microcontroller main control circuit, the communication module, and the stepper motor drive module.

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