Light supplement control circuit and camera device

Abstract

The invention relates to the technical field of cameras, is used for reducing the occupation of external function interfaces, and comprises a light source driving circuit, a light switching control circuit and at least two groups of light source load circuits with different light colors, the driving positive end of the light source driving circuit is respectively connected with the positive ends of the at least two groups of light sources with different light colors, the negative ends of the at least two groups of light source load circuits are respectively connected with the first end of the light switching control circuit, and the driving negative end of the light source driving circuit is connected with the second end of the light switching control circuit; and the light switching control circuit is used for switching off or switching on one group of light source load circuits based on a control signal of the switching control end.

Description

Technical Field

[0001] The present invention relates to the technical field of cameras, and in particular to a fill light control circuit and a camera device. Background Art

[0002] With the development of video surveillance technology, network cameras have been widely used in security, traffic monitoring, smart home and other fields. However, in low-light or no-light environments, the image quality of network cameras often drops significantly, affecting their normal functions. In order to improve image quality, modern cameras are usually equipped with multiple sets of light sources with different light colors for fill light. Users can automatically or manually select the fill light mode according to actual needs to adapt to various complex light environments.

[0003] In the traditional fill light control circuit, each group of light source loads with different light colors is equipped with an independent light source driving circuit, and each group of light sources with different light colors uses a single PWM interface for driving, resulting in a large number of light source driving circuits, occupying redundant PWM interfaces, and increasing the occupancy of peripheral function interfaces. Summary of the invention

[0004] The embodiments of the present invention provide a fill light control circuit and a camera device to solve the technical problem of increasing the occupation of peripheral function interfaces in traditional solutions.

[0005] A fill light control circuit comprises a light source driving circuit, a light source switching control circuit and at least two groups of light source load circuits with different light colors; The positive driving end of the light source driving circuit is respectively connected to the positive ends of the at least two groups of light sources with different light colors, the negative ends of the at least two groups of light source load circuits are respectively connected to the first end of the light switching control circuit, and the negative driving end of the light source driving circuit is connected to the second end of the light switching control circuit; The light switch control circuit disconnects or connects one of the light source load circuits based on the control signal of the switch control terminal.

[0006] In one embodiment, the light switch control circuit includes a shared resistor and a light group switch circuit corresponding to the at least two groups of light source load circuits respectively; Among them, the first end of the light group switching circuit is connected to the negative end of the corresponding light source load circuit, the second end of the light group switching circuit is connected to one end of the common resistor, the other end of the common resistor is connected to the ground, and the control end of the light group switching circuit is used to be connected to the switching control end.

[0007] In one embodiment, the at least two groups of light source load circuits with different light colors include an infrared light load circuit and a warm light load circuit.

[0008] In one embodiment, the light group switching circuit includes a first switching circuit and a second switching circuit; The first switching circuit includes a first resistor, a second resistor, a first switch and a second switch, one end of the first resistor is connected to the power supply end of the switching circuit, the other end is commonly connected to the control end of the second switch and is connected to the first end of the first switch, the control end of the first switch is connected to one end of the second resistor, the second end of the first switch is connected to the ground end, and the other end of the second resistor is connected to the switching control end; the first end of the second switch is connected to the negative end of the corresponding light source load circuit, and the second end of the second switch is connected to one end of the common resistor; The second switching circuit includes a third resistor, a fourth resistor, a fifth resistor, a third switch and a fourth switch, one end of the third resistor is connected to the power supply end of the switching circuit, the other end is connected to the control end of the fourth switch and is connected to the first end of the third switch, the control end of the third switch is connected to one end of the fourth resistor and one end of the fifth resistor, the second end of the third switch is connected to the switching control end; the first end of the fourth switch is connected to the negative end of the corresponding light source load circuit, the second end of the fourth switch is connected to one end of the common resistor, the other end of the fourth resistor is connected to the power supply end of the switching circuit, and the other end of the fifth resistor is connected to the ground.

[0009] In one embodiment, the first switch includes a first NPN transistor, and the second switch includes a first N-MOS transistor; One end of the first resistor is connected to the power supply end of the switching circuit, and the other end is connected to the gate of the N-MOS tube and the collector of the NPN transistor. The base of the NPN transistor is connected to one end of the second resistor, the emitter of the NPN transistor is connected to the ground end, and the other end of the second resistor is connected to the switching control end; the drain of the N-MOS tube is connected to the negative end of the corresponding light source load circuit, and the source of the N-MOS tube is connected to one end of the common resistor.

[0010] In one embodiment, the third switch includes a second NPN transistor, and the fourth switch includes a second N-MOS transistor; One end of the third resistor is connected to the power supply end of the switching circuit, and the other end is connected to the gate of the second N-MOS tube and the collector of the second NPN transistor. The base of the second NPN transistor is connected to one end of the fourth resistor and one end of the fifth resistor, and the emitter of the second NPN transistor is connected to the switching control end; the drain of the second N-MOS tube is connected to the negative end of the corresponding light source load circuit, and the source of the second N-MOS tube is connected to one end of the common resistor.

[0011] In one embodiment, the light source driving circuit includes a driving circuit power supply terminal, a driving chip, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and an inductor; The power supply end of the driving chip is connected to one end of the first capacitor and connected to the power supply end of the driving circuit, and the other end of the first capacitor is connected to the ground end; The output positive terminal of the driving chip is connected in common with one end of the inductor, the other end of the inductor, one end of the second capacitor and one end of the third capacitor are connected in common and connected to the positive end of the light source load circuit, and the other end of the second capacitor and the other end of the third capacitor are connected to the ground; The output negative terminal of the driving chip is connected in common with one end of the fourth capacitor and connected to one end of the common resistor, and the other end of the fourth capacitor is connected to the ground; The signal adjustment end of the driving chip is connected to one end of the sixth resistor and one end of the seventh resistor. The other end of the sixth resistor is used to connect to the external signal adjustment end. The other end of the seventh resistor is connected to the ground.

[0012] In one embodiment, the light switching control circuit switches on the infrared light load circuit and switches off the warm light load circuit based on the first control signal of the switching control terminal; The light switching control circuit disconnects the infrared light load circuit and turns on the warm light load circuit based on the second control signal of the switching control terminal; The light switching control circuit switches on the infrared light load circuit and switches off the warm light load circuit based on the third control signal of the switching control terminal; Among them, the first control signal is triggered when a dark light environment is preset, the second control signal is triggered when a bright light environment is preset, and the third control signal is triggered when a user portrait is detected.

[0013] In one embodiment, a camera device includes a control mainboard and a fill light control circuit as described in any of the above items, wherein the control mainboard includes an external signal adjustment terminal and a switching control terminal, and the control mainboard is connected to the fill light control circuit via the external signal adjustment terminal and the switching control terminal.

[0014] In one of the solutions provided in the present application, the positive driving end of the light source driving circuit is respectively connected to the positive ends of the at least two groups of light sources with different light colors, the negative ends of the at least two groups of light source load circuits are respectively connected to the first end of the light switching control circuit, the negative driving end of the light source driving circuit is connected to the second end of the light switching control circuit, and the switching control end of the light source driving circuit is connected to the control end of the light switching control circuit; the light switching control circuit disconnects or connects one of the groups of light source load circuits based on the control signal of the switching control end of the light source driving circuit. It can be seen that all the light source load circuits are switched and driven by the same light source driving circuit through the light switching control circuit, which reduces the number of light source driving circuits and reduces costs. At the same time, due to the shared switching control end of the light source driving circuit, the number of control interfaces such as PWM interfaces can be reduced, thereby reducing the occupation of peripheral function interfaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0016] Figure 1 is a structural schematic diagram of a fill light control circuit in one embodiment of the present invention; Figure 2 is another structural schematic diagram of a fill light control circuit in one embodiment of the present invention; Figure 3 It is another structural schematic diagram of a fill light control circuit in one embodiment of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present invention to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0019] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there may be no intervening elements or layers. It should be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0020] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0021] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0022] In order to fully understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0023] In one embodiment, if Figure 1As shown, a fill light control circuit is provided, which includes a light source driving circuit, a light switching control circuit and at least two groups of light source load circuits with different light colors; The positive driving end of the light source driving circuit is respectively connected to the positive ends of the at least two groups of light sources with different light colors, the negative ends of the at least two groups of light source load circuits are respectively connected to the first end of the light switching control circuit, and the negative driving end of the light source driving circuit is connected to the second end of the light switching control circuit; The light switch control circuit disconnects or connects one of the light source load circuits based on the control signal of the switch control terminal.

[0024] It can be seen that in this embodiment, all light source load circuits are switched and driven by the light switching control circuit, which reduces the number of light source driving circuits and reduces costs. At the same time, since the switching control end of the light source driving circuit is shared, the number of control interfaces such as PWM interfaces can be reduced, thereby reducing the occupation of peripheral function interfaces.

[0025] Furthermore, if Figure 2 In one embodiment, the light switch control circuit includes a shared resistor and a light group switch circuit corresponding to the at least two groups of light source load circuits respectively; Among them, the first end of the light group switching circuit is connected to the negative end of the corresponding light source load circuit, the second end of the light group switching circuit is connected to one end of the common resistor RC, the other end of the common resistor is connected to the ground, and the control end of the light group switching circuit is used to be connected to the switching control end.

[0026] In this embodiment, the specific contents of the light switching control circuit are detailed, wherein each light source load circuit is provided with a corresponding light group switching circuit for switching control, and the light group switching circuits are respectively connected to the ground terminal through a common resistor; since the common resistor is shared and different light group switching circuits are used for switching control, the power of different groups of light source load circuits can be set independently, subject to the maximum output voltage of the driver chip used in the light source driver circuit and the value of the common resistor.

[0027] In one embodiment, the at least two groups of light source load circuits with different light colors include an infrared light load circuit and a warm light load circuit; in other embodiments, there may also be other two groups of light source load circuits with different light colors, such as dark warm light, light warm light, etc., without specific limitation.

[0028] In one embodiment, the light group switching circuit includes a first switching circuit and a second switching circuit; The first switching circuit includes a first resistor R1, a second resistor R2, a first switch Q1 and a second switch Q2, one end of the first resistor R1 is connected to the switching circuit power supply terminal VCC1, the other end is commonly connected to the control end of the second switch Q2 and is connected to the first end of the first switch Q1, the control end of the first switch Q1 is connected to one end of the second resistor R2, the second end of the first switch Q1 is connected to the ground end, and the other end of the second resistor R2 is connected to the switching control end; the first end of the second switch Q2 is connected to the negative end of the corresponding light source load circuit, and the second end of the second switch Q2 is connected to one end of the common resistor; The second switching circuit includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a third switch Q3 and a fourth switch Q4, one end of the third resistor R3 is connected to the switching circuit power supply terminal VCC1, the other end is commonly connected to the control end of the fourth switch Q4 and is connected to the first end of the third switch Q3, the control end of the third switch Q3 is connected to one end of the fourth resistor R4 and one end of the fifth resistor R5, the second end of the third switch Q3 is connected to the switching control end; the first end of the fourth switch Q4 is connected to the negative end of the corresponding light source load circuit, the second end of the fourth switch Q4 is connected to one end of the common resistor RC, the other end of the fourth resistor R4 is connected to the switching circuit power supply terminal VCC1, and the other end of the fifth resistor R5 is connected to the ground.

[0029] In this embodiment, multiple switch circuits are added to form a two-to-one multiplexing switch for selecting a warm light load or an infrared light load, wherein the negative electrode of the warm light or the infrared light first passes through the second and fourth switches and then is connected to a shared sampling resistor; when the switching control terminal LED_Switch_EN pin is at a high level, the first switch Q1 is turned on, the second switch Q2 is turned off, and the warm light is off; the third switch Q3 is turned off, the fourth switch Q4 is turned on, and the infrared light is on.

[0030] When the switching control terminal LED_Switch_EN pin is at a low level, the first switch Q1 is turned off, the second switch Q2 is turned on, and the warm light is on; the third switch Q3 is turned on, the fourth switch Q4 is turned off, and the infrared light is off.

[0031] The load current of the load circuit can be controlled by the duty cycle of the light source driving circuit to achieve the purpose of dimming.

[0032] like Figure 3 As shown, in one embodiment, the first switch Q1 includes a first NPN transistor, and the second switch Q2 includes a first N-MOS transistor; One end of the first resistor R1 is connected to the power supply end of the switching circuit, and the other end is connected to the gate of the N-MOS tube and the collector of the NPN transistor. The base of the NPN transistor is connected to one end of the second resistor R2, the emitter of the NPN transistor is connected to the ground end, and the other end of the second resistor R2 is connected to the switching control end; the drain of the N-MOS tube is connected to the negative end of the corresponding light source load circuit, and the source of the N-MOS tube is connected to one end of the common resistor.

[0033] In one embodiment, the third switch Q3 includes a second NPN transistor, and the fourth switch Q4 includes a second N-MOS transistor; One end of the third resistor R3 is connected to the power supply end of the switching circuit, and the other end is connected to the gate of the second N-MOS tube and the collector of the second NPN transistor. The base of the second NPN transistor is connected to one end of the fourth resistor R4 and one end of the fifth resistor R5, and the emitter of the second NPN transistor is connected to the switching control end; the drain of the second N-MOS tube is connected to the negative end of the corresponding light source load circuit, and the source of the second N-MOS tube is connected to one end of the common resistor.

[0034] In the above embodiment, by providing specific implementation types of the first switch to the fourth switch, the implementation of the solution is ensured.

[0035] as follows Figure 3 As shown, the negative electrode of the warm light or infrared light first passes through the N-MOS and then connects to the shared sampling resistor RC and then to the negative terminal of the driver chip. Assuming that the reference voltage of the negative terminal is 0.1V, the voltage of LEDW- to ground is 0.1V.

[0036] When the switching control terminal LED_Switch_EN pin is at a high level, the first NPN transistor is turned on, and the Vgs (QN01) of the first N-MOS tube is ≈0V, so the first N-MOS tube is turned off and the warm light goes out; the second NPN transistor is turned on and off, and the Vgs (QN03) of the second N-MOS tube is ≈3.3V-0.1V=3.2V, so the second N-MOS tube is turned on and the infrared light is on.

[0037] When the switching control terminal LED_Switch_EN pin is at a low level, the first NPN transistor is turned off, and the Vgs (QN01) of the second N-MOS tube is ≈3.3V-0.1V=3.2V, so the first N-MOS tube is turned on and the warm light is on; the second NPN transistor is turned on, and the Vgs (QN03) of the second N-MOS tube is ≈0V, so the second N-MOS tube is turned off and the infrared light is off.

[0038] The load current is controlled by the duty cycle of the driving circuit to achieve the purpose of dimming. For example, the LED_PWM_EN terminal of some driver chips, that is, the signal adjustment terminal, can be used to control it, such as Figure 3 As described above, in some specific chips, a fifth capacitor C5 is also included, which is used as a peripheral circuit between the feedback pin of the driver chip and the driving positive terminal to ensure the normal operation of the chip.

[0039] It should be noted that in other implementations, the above switches may also be combined with other switch types, which is not specifically limited.

[0040] like Figure 3 In one embodiment, the light source driving circuit includes a driving circuit power supply terminal VCC2, a driving chip, a sixth resistor R6, a seventh resistor R7, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and an inductor L; The power supply end of the driving chip is connected to one end of the first capacitor C1 and connected to the power supply end VCC2 of the driving circuit, and the other end of the first capacitor C1 is connected to the ground end; The output positive terminal of the driving chip is connected to one end of the inductor L, the other end of the inductor L, one end of the second capacitor C2 and one end of the third capacitor C3 are connected to the positive end of the light source load circuit, and the other end of the second capacitor C2 and the other end of the third capacitor C3 are connected to the ground; The output negative terminal of the driving chip is connected to one end of the fourth capacitor C4 and one end of the common resistor RC, and the other end of the fourth capacitor C4 is connected to the ground; The signal adjustment end of the driving chip is connected to one end of the sixth resistor R6 and one end of the seventh resistor R7. The other end of the sixth resistor R6 is connected to the external signal adjustment end. The other end of the seventh resistor R7 is connected to the ground.

[0041] In one embodiment: The light switching control circuit switches on the infrared light load circuit and switches off the warm light load circuit based on the first control signal of the switching control terminal; The light switching control circuit disconnects the infrared light load circuit and turns on the warm light load circuit based on the second control signal of the switching control terminal; The light switching control circuit switches on the infrared light load circuit and switches off the warm light load circuit based on the third control signal of the switching control terminal; Among them, the first control signal is triggered when a dark light environment is preset, the second control signal is triggered when a bright light environment is preset, and the third control signal is triggered when a user portrait is detected.

[0042] It should be understood that in low-light or no-light environments, the image quality of webcams often drops significantly, affecting their normal functions. To improve image quality, modern cameras are usually equipped with both infrared and warm light fill lights. Infrared fill light effectively improves image clarity at night or in low-light environments, while warm light fill light provides natural lighting in low-light but light-rich environments to ensure color reproduction; and when a user appears, in order to ensure the user's clarity, the red light is turned on for shooting. Users can automatically or manually select the fill light mode according to actual needs, or use a combination of the two fill lights to adapt to various complex light environments and achieve the best imaging effect.

[0043] In one embodiment, a camera device includes a control mainboard and a fill light control circuit as described in any of the above items, wherein the control mainboard includes an external signal adjustment terminal and a switching control terminal, and the control mainboard is connected to the fill light control circuit via the external signal adjustment terminal and the switching control terminal.

[0044] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A fill light control circuit, characterized in that: It includes a light source driving circuit, a light switching control circuit and at least two groups of light source load circuits with different light colors; The positive driving end of the light source driving circuit is respectively connected to the positive ends of the at least two groups of light sources with different light colors, the negative ends of the at least two groups of light source load circuits are respectively connected to the first end of the light switching control circuit, and the negative driving end of the light source driving circuit is connected to the second end of the light switching control circuit; The light switch control circuit disconnects or connects one of the light source load circuits based on the control signal of the switch control terminal.

2. The fill light control circuit according to claim 1, characterized in that: The light switch control circuit includes a common resistor and a light group switch circuit corresponding to the at least two groups of light source load circuits respectively; Among them, the first end of the light group switching circuit is connected to the negative end of the corresponding light source load circuit, the second end of the light group switching circuit is connected to one end of the common resistor, the other end of the common resistor is connected to the ground, and the control end of the light group switching circuit is used to be connected to the switching control end.

3. The fill light control circuit according to claim 2, characterized in that: The at least two groups of light source load circuits with different light colors include an infrared light load circuit and a warm light load circuit.

4. The fill light control circuit according to claim 2, characterized in that: The lamp group switching circuit includes a first switching circuit and a second switching circuit; The first switching circuit includes a first resistor, a second resistor, a first switch and a second switch, one end of the first resistor is connected to the power supply end of the switching circuit, the other end is commonly connected to the control end of the second switch and is connected to the first end of the first switch, the control end of the first switch is connected to one end of the second resistor, the second end of the first switch is connected to the ground end, and the other end of the second resistor is connected to the switching control end; the first end of the second switch is connected to the negative end of the corresponding light source load circuit, and the second end of the second switch is connected to one end of the common resistor; The second switching circuit includes a third resistor, a fourth resistor, a fifth resistor, a third switch and a fourth switch, one end of the third resistor is connected to the power supply end of the switching circuit, the other end is connected to the control end of the fourth switch and is connected to the first end of the third switch, the control end of the third switch is connected to one end of the fourth resistor and one end of the fifth resistor, the second end of the third switch is connected to the switching control end; the first end of the fourth switch is connected to the negative end of the corresponding light source load circuit, the second end of the fourth switch is connected to one end of the common resistor, the other end of the fourth resistor is connected to the power supply end of the switching circuit, and the other end of the fifth resistor is connected to the ground.

5. The fill light control circuit according to claim 4, characterized in that: The first switch includes a first NPN transistor, and the second switch includes a first N-MOS transistor; One end of the first resistor is connected to the power supply end of the switching circuit, and the other end is connected to the gate of the N-MOS tube and the collector of the NPN transistor. The base of the NPN transistor is connected to one end of the second resistor, the emitter of the NPN transistor is connected to the ground end, and the other end of the second resistor is connected to the switching control end; the drain of the N-MOS tube is connected to the negative end of the corresponding light source load circuit, and the source of the N-MOS tube is connected to one end of the common resistor.

6. The fill light control circuit according to claim 4, characterized in that: The third switch includes a second NPN transistor, and the fourth switch includes a second N-MOS transistor; One end of the third resistor is connected to the power supply end of the switching circuit, and the other end is connected to the gate of the second N-MOS tube and the collector of the second NPN transistor. The base of the second NPN transistor is connected to one end of the fourth resistor and one end of the fifth resistor, and the emitter of the second NPN transistor is connected to the switching control end; the drain of the second N-MOS tube is connected to the negative end of the corresponding light source load circuit, and the source of the second N-MOS tube is connected to one end of the common resistor.

7. The fill light control circuit according to claim 2, characterized in that: The light source driving circuit comprises a driving circuit power supply terminal, a driving chip, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and an inductor; The power supply end of the driving chip is connected to one end of the first capacitor and connected to the power supply end of the driving circuit, and the other end of the first capacitor is connected to the ground end; The output positive terminal of the driving chip is connected in common with one end of the inductor, the other end of the inductor, one end of the second capacitor and one end of the third capacitor are connected in common and connected to the positive end of the light source load circuit, and the other end of the second capacitor and the other end of the third capacitor are connected to the ground; The output negative terminal of the driving chip is connected in common with one end of the fourth capacitor and connected to one end of the common resistor, and the other end of the fourth capacitor is connected to the ground; The signal adjustment end of the driving chip is connected to one end of the sixth resistor and one end of the seventh resistor. The other end of the sixth resistor is used to connect to the external signal adjustment end. The other end of the seventh resistor is connected to the ground.

8. The fill light control circuit according to any one of claims 3 to 7, characterized in that: The light switching control circuit switches on the infrared light load circuit and switches off the warm light load circuit based on the first control signal of the switching control terminal; The light switching control circuit disconnects the infrared light load circuit and turns on the warm light load circuit based on the second control signal of the switching control terminal; The light switching control circuit switches on the infrared light load circuit and switches off the warm light load circuit based on the third control signal of the switching control terminal; Among them, the first control signal is triggered when a dark light environment is preset, the second control signal is triggered when a bright light environment is preset, and the third control signal is triggered when a user portrait is detected.

9. A camera device, characterized in that: It comprises a control mainboard and a fill light control circuit as described in any one of claims 1 to 8, wherein the control mainboard comprises an external signal adjustment terminal and a switching control terminal, and the control mainboard is connected to the fill light control circuit via the external signal adjustment terminal and the switching control terminal.

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