CN215453041U

CN215453041U - Control circuit, camera module and terminal equipment

Info

Publication number: CN215453041U
Application number: CN202120354835.2U
Authority: CN
Inventors: 不公告发明人
Original assignee: Nanchang OFilm Optoelectronics Technology Co Ltd
Current assignee: Nanchang OFilm Optoelectronics Technology Co Ltd
Priority date: 2021-02-08
Filing date: 2021-02-08
Publication date: 2022-01-07
Anticipated expiration: 2031-02-08

Abstract

The application discloses control circuit, camera module and terminal equipment belongs to circuit technical field. The control circuit is applied to a camera module, and the camera module comprises an optical filter component; the control circuit includes: the optical filter assembly comprises a controller, a first switching circuit and a second switching circuit, wherein the controller is electrically connected with the first switching circuit and the second switching circuit respectively; when the first switching circuit receives a first PWM signal transmitted by the controller, the first switching circuit provides a first voltage to the optical filter component; the second switching circuit supplies the first voltage to the optical filter assembly when the second switching circuit receives the first PWM signal transmitted from the controller. The current flowing through the circuit in the optical filter switching process is reduced based on the first PWM signal, and the heat generation of the ICR is reduced.

Description

Control circuit, camera module and terminal equipment

Technical Field

The application relates to the technical field of circuits, in particular to a control circuit, a camera module and a terminal device.

Background

With the rapid development of scientific technology, more and more functions can be realized in the terminal equipment, for example, more and more terminal equipment can realize functions such as shooting, monitoring, video and the like through the installed camera module. The camera modules arranged on some terminals can further comprise various optical filters, and the terminals can shoot under different scenes by controlling the switching of the optical filters. At present, a camera module is often provided with an IR-Cut Filter Removable (ICR), and a terminal can switch optical filters through the ICR, so that the camera module can be used in different environments. The electromagnetic ICR may control the switching of the optical filter according to the working principle that the electromagnetic coil is supplied with voltages in opposite directions for a period of time to achieve the switching of the optical filter.

In the process of switching the optical filter by the ICR, when the ICR is provided with current with fixed magnitude or the voltage is used for controlling the switching of the optical filter, the heat of the ICR is increased, the problem of damage of the ICR is caused, and the service life of the camera module is shortened.

Disclosure of Invention

The embodiment of the application provides a control circuit, a camera module and terminal equipment, when switching circuit control optical filter component among the control circuit switches, reduce the electric current that flows among the switching process optical filter component, reduce ICR's generating heat, improve the life of camera module.

In one aspect, an embodiment of the present application provides a control circuit, where the control circuit is applied to a camera module, where the camera module includes an optical filter assembly, and the optical filter assembly includes at least two optical filters; the control circuit includes: the optical filter assembly comprises a controller, a first switching circuit and a second switching circuit, wherein the controller is electrically connected with the first switching circuit and the second switching circuit respectively, and the optical filter assembly is electrically connected with the first switching circuit and the second switching circuit respectively;

when the first switching circuit receives a first PWM signal transmitted by the controller, the first switching circuit provides a first voltage to the optical filter component so that the optical filter component is switched from a first optical filter currently used to a second optical filter;

when the second switching circuit receives the first PWM signal transmitted by the controller, the second switching circuit provides a first voltage to the optical filter assembly, so that the optical filter assembly is switched from the currently used second optical filter to the first optical filter.

In this embodiment of the application, the control circuit receives the first PWM signal transmitted by the controller through the first switching circuit or the second switching circuit, and provides the first voltage to the optical filter based on the PWM signal to complete the switching of the optical filter.

As an optional implementation manner, in an aspect of the embodiments of the present application, the controller includes a first output terminal and a second output terminal, the first switching circuit includes a first input terminal, and the second switching circuit includes a second input terminal; the first output end is electrically connected with the first input end, and the second output end is electrically connected with the second input end;

the first switching circuit receives a first PWM signal output by the controller through the first output end through the first input end;

the second switching circuit receives the first PWM signal output by the controller through the second output terminal through the second input terminal.

In the embodiment of the application, the first output end and the second output end are arranged on the controller, the first output end controls the first PWM signal to be input to the first switching circuit, and the second output end controls the first PWM signal to be input to the second switching circuit, so that the controllability of the controller on the input signals of the first switching circuit and the second switching circuit is improved.

As an optional implementation manner, in an aspect of the embodiments of the present application, the first switching circuit further includes a third output terminal, the second switching circuit further includes a fourth output terminal, and the optical filter assembly further includes a third input terminal and a fourth input terminal;

the third output end is electrically connected with the third input end, and the fourth output end is electrically connected with the fourth input end;

the third input end is also electrically connected with one end of the electromagnetic coil in the optical filter component, and the fourth input end is also electrically connected with the other end of the electromagnetic coil in the optical filter component.

In the embodiment of the application, the optical filter assembly comprises an electromagnetic coil, and the electromagnetic coil is connected with one end of the electromagnetic coil through a first switching circuit and a second switching circuit respectively to form a loop for providing voltage for the electromagnetic coil, so that the voltage is provided for the optical filter assembly, and the management efficiency of a controller for the first switching circuit and the second switching circuit is improved.

As an optional implementation manner, in an aspect of the embodiments of the present application, the first switching circuit includes a first power supply, a first field effect transistor, a second field effect transistor, a third field effect transistor, and a first resistance device;

the first power supply is electrically connected with the source electrode of the first field effect transistor, and is also electrically connected with one end of the first resistor device;

the drain electrode of the first field effect transistor is electrically connected with the drain electrode of the second field effect transistor;

the grid electrode of the first field effect transistor is electrically connected with the grid electrode of the second field effect transistor;

the source electrode of the second field effect transistor is grounded;

the drain electrode of the third field effect transistor is electrically connected with a first connecting point, and the first connecting point is a connecting point between the grid electrode of the first field effect transistor and the grid electrode of the second field effect transistor;

the other end of the first resistor device is electrically connected with a drain electrode of the third field effect transistor;

the source electrode of the third field effect transistor is grounded;

the first output end is electrically connected with the grid electrode of the third field effect transistor;

the third output end is electrically connected with a second connection point, and the second connection point is a connection point between the drain electrode of the first field effect transistor and the drain electrode of the second field effect transistor.

In the embodiment of the application, each component in the first switching circuit is introduced, and through the connection relationship among the first power supply, the first field effect transistor, the second field effect transistor and the third field effect transistor, the first switching circuit controls the third output end to be in two forms of the voltage position of the first power supply or the voltage position of the ground, so that the application mode of the first switching circuit is expanded.

As an optional implementation manner, in an aspect of the embodiments of the present application, the second switching circuit includes a second power supply, a fourth field effect transistor, a fifth field effect transistor, a sixth field effect transistor, and a second resistance device;

the second power supply is electrically connected with the source electrode of the fourth field effect transistor, and the second power supply is also electrically connected with one end of the second resistor device;

the drain electrode of the fourth field effect transistor is electrically connected with the drain electrode of the fifth field effect transistor;

the grid electrode of the fourth field effect transistor is electrically connected with the grid electrode of the fifth field effect transistor;

the source electrode of the fifth field effect transistor is grounded;

the drain electrode of the sixth field effect transistor is electrically connected with a third connection point, and the third connection point is a connection point between the grid electrode of the fourth field effect transistor and the grid electrode of the fifth field effect transistor;

the other end of the second resistor device is electrically connected with a drain electrode of the sixth field effect transistor;

the source electrode of the sixth field effect transistor is grounded;

the second output end is electrically connected with the grid electrode of the sixth field effect transistor;

the fourth output end is electrically connected with a fourth connection point, and the fourth connection point is a connection point between the drain electrode of the fourth field effect transistor and the drain electrode of the fifth field effect transistor.

In the embodiment of the application, each component in the second switching circuit is introduced, and two forms that the second switching circuit controls the fourth output end to be in the voltage position of the first power supply or the voltage position of the ground are realized through the connection relationship among the second power supply, the fourth field effect transistor, the fifth field effect transistor and the sixth field effect transistor, so that the application mode of the second switching circuit is expanded.

As an optional implementation manner, in an aspect of the embodiments of the present application, the control circuit further includes a maintaining circuit, the controller further includes a fifth output terminal, and the maintaining circuit includes a fifth input terminal and a sixth output terminal;

the controller is electrically connected with the fifth input end through the fifth output end, and the maintaining circuit is electrically connected with the electromagnetic coil through the sixth output end;

when the maintaining circuit receives a second PWM signal transmitted by the controller, the maintaining circuit provides a second voltage to the optical filter component to increase the electromagnetic force of the electromagnetic coil, so that the switched optical filter is in a fixed position.

In the embodiment of the application, the maintaining circuit is led out, and the electromagnetic force of the electromagnetic coil is increased by providing the second PWM signal to the switched maintaining circuit through the electrical connection of the controller and the maintaining circuit, so that the stability of the optical filter is improved, the current output by the maintaining circuit is reduced, the heat generation is reduced, and the service life of the camera module is prolonged.

As an optional implementation manner, in an aspect of the embodiments of the present application, the control circuit further includes a first feedback circuit, and the first feedback circuit is electrically connected to the controller and the optical filter assembly respectively;

the first feedback circuit is used for sending a first feedback signal to the controller when the temperature of the optical filter assembly is higher than a preset temperature threshold value so as to trigger the controller to adjust the signal parameter of the first PWM signal.

In the embodiment of the application, in combination with the feedback condition of the first feedback circuit, when the temperature of the optical filter assembly is higher than the preset temperature threshold, the signal parameter of the first PWM signal is adjusted, so as to reduce the current and the temperature.

As an optional implementation manner, in an aspect of the embodiment of the present application, the signal parameter includes at least one of a PWM frequency and a duty ratio.

In the embodiment of the present application, the signal parameter is refined into any one or more of a PWM frequency and a duty ratio, and the signal parameter of the first PWM signal is adjusted by using a specific parameter, so that flexibility of parameter adjustment is increased.

In one aspect, the present application provides a camera module including at least one control circuit as described in one of the above aspects and any one of the above alternatives.

In one aspect, an embodiment of the present application provides a terminal device, where the terminal device includes at least one camera module according to the above aspect.

The technical scheme provided by the embodiment of the application can at least comprise the following beneficial effects:

in the embodiment of the application, a first PWM signal is input to a first switching circuit or a second switching circuit through a controller, and when receiving the first PWM signal transmitted by the controller, the first switching circuit or the second switching circuit in a control circuit provides a first voltage to an optical filter based on the PWM signal to complete switching of the optical filter.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a filter switching method according to an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a control circuit according to an exemplary embodiment of the present application;

FIG. 3 is a schematic diagram of a control circuit according to an exemplary embodiment of the present application;

FIG. 4 is a schematic diagram of a control circuit of FIG. 3 according to an exemplary embodiment of the present application;

FIG. 5 is a schematic diagram of another control circuit of FIG. 3 in accordance with an exemplary embodiment of the present application;

fig. 6 is a schematic diagram of a PWM signal according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

Reference herein to "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

It should be noted that the terms "first", "second", "third" and "fourth", etc. in the description and claims of the present application are used for distinguishing different objects, and are not used for describing a specific order. The terms "comprises," "comprising," and "having," and any variations thereof, of the embodiments of the present application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The scheme provided by the application can be used in the process of adapting to different use scenes by switching the optical filters when the terminal used by people in daily life comprises the electromagnetic dual-optical-filter switcher, and for convenience of understanding, some terms and application architectures related to the embodiment of the application are briefly introduced below.

The double-Filter switcher (ICR) is characterized in that a group of filters are arranged in a lens module of a camera, and when an infrared sensing point outside the lens detects the change of the intensity of light, the built-in ICR automatically switches the filters, so that switching is realized according to the change of the intensity of external light, and the image achieves the best effect.

In daily life, cameras have been applied to various terminals, and people can take pictures, record videos, and the like by using the cameras. Due to the fact that the quality of the images acquired by the terminal through the camera is different in different scenes, for example, the quality of the images acquired by the terminal through the camera is better under the condition that the light intensity is stronger in the daytime, and the quality of the images acquired by the terminal through the camera is poorer under the condition that the light intensity is weaker at night.

At present, a set of optical filters is arranged in a lens module of a camera, and the optical filters are switched according to the light intensity in the daytime and at night, so that the quality of images acquired at night can be improved. Please refer to fig. 1, which shows a schematic structural diagram of a filter switching method according to an exemplary embodiment of the present disclosure. As shown in fig. 1, the filter assembly 100 includes a filter set 110, a rocker arm 120, a magnet 130, an electromagnetic coil 140, a first electrode 150, and a second electrode 160.

The optical filter assembly 100 may be applied to a terminal, the optical filter assembly 110 may include at least a first optical filter 111 and a second optical filter 112, the optical filter assembly 110 may be mechanically connected to the rocker 120, the rocker 120 is mechanically connected to the magnet 130, and the terminal supplies power to the electromagnetic coil 140 through the first electrode 150 and the second electrode 160, so that the electromagnetic coil generates electromagnetic force to push the magnet 130 to change from the first position 141 to the second position 142, or push the magnet 130 to change from the second position 142 to the first position 141, so that the magnet drives the optical filters to switch through the mechanical connection with the rocker.

For example, in fig. 1, the terminal makes the first electrode 150 be a positive electrode, the second electrode 160 be a negative electrode, and a voltage is applied to the electromagnetic coil 140, so that the electromagnetic coil generates an electromagnetic force to push the magnet 130 to change from the second position 142 to the first position 141, thereby implementing switching of the first filter 111 to the second filter 112.

In one mode of the related art, during the switching process of the filter set 110, the electromagnetic coil 140 needs to be powered through the first electrode 150 and the second electrode 160, and heat is generated in the electromagnetic coil due to the flowing of current, which causes a problem that the temperature of the electromagnetic coil is high, which causes damage to the ICR, and reduces the service life of the camera module.

In order to reduce the heat generated in the ICR and prolong the service life of the camera module, the application provides a solution which can supply voltage to the electromagnetic coil in an intermittent power supply mode, so that the current flowing in the electromagnetic coil under the same voltage is reduced, the heat generated in the ICR is reduced, and the service life of the camera module is prolonged.

Referring to fig. 2, a schematic diagram of a control circuit according to an exemplary embodiment of the present disclosure is shown. The control circuit can be applied to a camera module, the camera module includes a filter assembly 210, and the filter assembly 210 includes at least two filters. As shown in fig. 2, the control circuit 200 includes: a controller 201, a first switching circuit 202, and a second switching circuit 203;

the controller 201 is electrically connected to the first switching circuit 202 and the second switching circuit 203, respectively, and the filter assembly is electrically connected to the first switching circuit 202 and the second switching circuit 203, respectively.

Optionally, the controller 201 may input a first Pulse Width Modulation (PWM) signal to the first switching circuit 202 through the electrical connection with the first switching circuit 202. When the first switching circuit 202 receives the first PWM signal transmitted by the controller, the first switching circuit 202 provides a first voltage to the filter assembly 210, so that the filter assembly 210 is switched from the currently used first filter to the second filter.

Optionally, the controller 201 may also input the first PWM signal to the second switching circuit 203 through an electrical connection with the second switching circuit 203. When the second switching circuit 203 receives the first PWM signal transmitted by the controller, the second switching circuit 203 supplies a first voltage to the filter assembly 210, so that the filter assembly is switched from the currently used second filter to the first filter.

That is, the controller 201 may input the first PWM signal to the first switching circuit 202 and may also input the first PWM signal to the second switching circuit 203, so that the first switching circuit or the second switching circuit supplies the first voltage to the optical filter assembly 210. Note that, here, the first voltage indicates a voltage magnitude. For example, the first filter is a visible light filter, the second filter is an infrared light filter, and when the controller 201 inputs the first PWM signal to the first switching circuit 202, the first switching circuit 202 provides a voltage of 3.3 volts (V) to the filter assembly 210, so that the filter assembly is switched from the visible light filter to the infrared light filter. When the controller 201 inputs the first PWM signal to the second switching circuit 203, the second switching circuit 203 supplies a voltage of 3.3V to the filter assembly 210, so that the filter assembly is switched from the infrared light filter to the visible light filter.

For example, as an example of the optical filter switching structure shown in fig. 1, the first switching circuit 202 is electrically connected to the first electrode 150, the second switching circuit 203 is electrically connected to the second electrode 160, when the controller 201 inputs the first PWM signal to the first switching circuit 202, the first switching circuit 202 outputs the first voltage to the first electrode 150, the second switching circuit 203 grounds the second electrode 160, and at this time, the first electrode 150 is used as a positive electrode, and the second electrode 160 is used as a negative electrode to provide the first voltage to the electromagnetic coil 140, so that the electromagnetic coil generates an electromagnetic force to push the magnet 130 to change from the second position 142 to the first position 141, thereby switching the first optical filter 111 to the second optical filter 112, and then, the second optical filter is maintained at the switched position by an attractive force between the magnet and the permanent magnet, thereby performing an operation using the switched second optical filter. Accordingly, in the embodiment of the present application, when the controller 201 inputs the first PWM signal to the second switching circuit 203, the first switching circuit 202 connects the first electrode 150 to ground, the second switching circuit 203 outputs the first voltage to the second electrode 160, and at this time, the first voltage is provided to the electromagnetic coil 140 by taking the first electrode 150 as a negative electrode and the second electrode 160 as a positive electrode, so that the electromagnetic coil generates an electromagnetic force to push the magnet 130 to change from the second position 141 to the first position 142, thereby switching the second filter 112 to the first filter 111.

In summary, in the embodiment of the present application, the controller inputs the first PWM signal to the first switching circuit or the second switching circuit, and when the first switching circuit or the second switching circuit in the control circuit receives the first PWM signal transmitted by the controller, the first switching circuit or the second switching circuit provides the first voltage to the optical filter based on the PWM signal to complete the switching of the optical filter.

Referring to fig. 3, a schematic diagram of a control circuit according to an exemplary embodiment of the present disclosure is shown. The control circuit can be applied to a camera module, the camera module includes a filter assembly 310, and the filter assembly 310 includes at least two filters. As shown in fig. 3, the control circuit 300 includes a controller 301, a first switching circuit 302, and a second switching circuit 303;

the controller 301 includes a first output terminal 301a and a second output terminal 301b, the first switching circuit 302 includes a first input terminal 302a, and the second switching circuit 303 includes a second input terminal 303 a; the controller 301 is electrically connected to the first input terminal 302a of the first switching circuit 302 through the first output terminal 301a, and the controller 301 is electrically connected to the second input terminal 303a of the second switching circuit 303 through the second output terminal 301 b. The first switching circuit 302 receives the first PWM signal output by the controller 301 through the first output terminal 301a through the first input terminal 302 a; the second switching circuit 303 receives the first PWM signal output by the controller 301 through the second output terminal 301b through the second input terminal 303 a.

In the embodiment of the present application, the filter assembly 310 further includes an electromagnetic coil 311 and a filter set 312, and the connection relationship between the electromagnetic coil 311 and the filter set 312 may refer to the description in fig. 1, which is not described herein again. The first switching circuit 302 further includes a third output end 302b, the second switching circuit 303 further includes a fourth output end 303b, and the optical filter assembly 310 further includes a third input end 310a and a fourth input end 310 b; the third output end 302b is electrically connected to the third input end 310a, and the fourth output end 303b is electrically connected to the fourth input end 310 b; the third input terminal 310a is further electrically connected to one end of the electromagnetic coil 311 in the optical filter assembly 310, and the fourth input terminal 310b is further electrically connected to the other end of the electromagnetic coil 311 in the optical filter assembly 310.

When the first switching circuit 302 receives the first PWM signal transmitted by the controller 301, the first switching circuit 302 provides a first voltage to the filter assembly 310, so that the filter assembly 310 is switched from the currently used first filter to the second filter. That is, when the first switching circuit 302 receives the first PWM signal transmitted by the controller 301, the first switching circuit 302 provides the first voltage to the filter assembly 310 through the third output terminal 302 b. When the second switching circuit 303 receives the first PWM signal transmitted by the controller, the second switching circuit 303 provides the first voltage to the filter assembly 310, so that the filter assembly 310 is switched from the currently used second filter to the first filter. That is, when the second switching circuit 303 receives the first PWM signal transmitted by the controller 301, the second switching circuit 303 provides the first voltage to the filter assembly 310 through the fourth output terminal 303 b.

For example, in practical applications, as exemplified by the filter switching structure shown in fig. 1, the first switching circuit 302 may be electrically connected to the first electrode 150, and the second switching circuit 303 may be electrically connected to the second electrode 160. The controller 301 may output a first PWM signal through a first output terminal 301a, so that the first switching circuit 302 receives the first PWM signal, and intermittently inputs a first voltage to the first electrode 150 according to the first PWM signal, so that the first electrode 150 of the optical filter assembly is at a high level, and the second electrode 160 is at a low level, thereby performing optical filter switching. Alternatively, the controller 301 may output the first PWM signal through the second output terminal 301b, so that the second switching circuit 303 receives the first PWM signal, and intermittently inputs the first voltage to the second electrode 160 according to the first PWM signal, so that the second electrode 160 of the optical filter assembly is at a high level, and the first electrode 150 is at a low level, thereby performing optical filter switching.

In one possible implementation, the first switching circuit 302 may include a first power source 312, a first fet 322, a second fet 332, a third fet 342, and a first resistor 352. Wherein the first power source 312 is electrically connected to the source of the first fet 322, and the first power source 312 is further electrically connected to one end of the first resistor 352; the drain of the first fet 322 is electrically connected to the drain of the second fet 332; the gate of the first fet 322 is electrically connected to the gate of the second fet 332; the source of the second fet 332 is grounded; the drain of the third fet 342 is electrically connected to a first connection point, which is a connection point between the gate of the first fet 322 and the gate of the second fet 332; the other end of the first resistor 352 is electrically connected to the drain of the third fet 342, and the source of the third fet 342 is grounded.

Optionally, the first output terminal 301a of the controller may be electrically connected to the gate of the third fet 342; the third output terminal 302b of the first switching circuit is electrically connected to a second connection point, which is a connection point between the drain of the first fet 322 and the drain of the second fet 332.

When the first output end 301a of the controller outputs the first PWM signal, the first switching circuit 302 receives the first PWM signal through the gate of the third fet 342, and at this time, the other end of the drain of the third fet 342, which is connected to the first resistor 352, is at the high-pass position, which is equivalent to the gate and the drain of the first fet 322 being applied with voltage at the same time, and at this time, the first fet 322 operates, and the voltage of the first power supply is output to the third output end 302b of the first switching circuit through the drain of the first fet 322 and the second connection point, so as to provide the first voltage, so that the optical filter assembly is switched from the currently used first optical filter to the second optical filter.

When the first output terminal 301a of the controller does not output the pulse signal, the other end of the third fet 342 connected to the first resistor 352 is at the low-going position, which is equivalent to that the gate of the first fet 322 is not applied with voltage, at this time, the first fet 322 is not operated, but for the second fet 332, the gate and the drain of the second fet 332 are simultaneously applied with low-level voltage (grounded), and the second fet 332 is operated, so that the third output terminal 302b of the first switching circuit is grounded through the drain of the second fet 332 and the second connection point. That is, when the gate of the third fet 342 has a voltage input, the first fet 322 of the first switching circuit 302 is turned on, and the second fet 332 is turned off. When no voltage is input to the gate of the third fet 342, the first fet 322 of the first switching circuit 302 is turned off, and the second fet 332 is turned on.

In a possible implementation manner, the second switching circuit 303 may include a second power supply 313, a fourth fet 323, a fifth fet 333, a sixth fet 343, and a second resistor 353. The second power supply 313 is electrically connected to the source of the fourth fet 323, and the second power supply 313 is further electrically connected to one end of the second resistor 353; the drain electrode of the fourth field effect transistor 323 is electrically connected with the drain electrode of the fifth field effect transistor 333; the grid electrode of the fourth field effect transistor 323 is electrically connected with the grid electrode of the fifth field effect transistor 333; the source of the fifth field effect transistor 333 is grounded; the drain of the sixth fet 343 is electrically connected to a third connection point, which is a connection point between the gate of the fourth fet 323 and the gate of the fifth fet 333; the other end of the second resistor 353 is electrically connected to the drain of the sixth fet 343, and the source of the sixth fet 343 is grounded.

Optionally, the second output terminal 301b of the controller is electrically connected to a gate of a sixth fet 343 included in the second switching circuit; the fourth output terminal 303b of the second switching circuit is electrically connected to a fourth connection point, which is a connection point between the drain of the fourth fet 323 and the drain of the fifth fet 333.

Similarly, when the second output terminal 301b of the controller outputs the first PWM signal, the second switching circuit 303 receives the first PWM signal through the gate of the sixth fet 343, and at this time, the other end of the sixth fet 343, which is connected to the second resistor 353, is in the high-pass position, which is equivalent to the gate and the drain of the fourth fet 323 being applied with voltages at the same time, and at this time, the fourth fet 323 operates, and the voltage of the second power supply is output to the fourth output terminal 303b of the second switching circuit through the drain of the fourth fet 323 and the fourth connection point, so as to provide the first voltage.

When the second output terminal 301b of the controller does not output the pulse signal, the other end of the drain of the sixth fet 343, which is connected to the second resistor 353, is at the low-going position, which is equivalent to that the gate of the fourth fet 323 is not applied with voltage, at this time, the fourth fet 323 is not operated, but for the fifth fet 333, which is equivalent to that the gate and the drain of the fifth fet 333 are simultaneously applied with low-potential voltage (grounded), the fifth fet 333 is operated, and the fourth output terminal 303b of the second switching circuit is grounded through the drain of the fifth fet 333 and the fourth connection point. That is, when the gate of the sixth fet 343 has a voltage input, the fourth fet 323 in the second switching circuit 303 is turned on, and the fifth fet 333 is turned off. When no voltage is input to the gate of the sixth fet 343, the fourth fet 323 in the second switching circuit 303 is turned off, and the fifth fet 333 is turned on.

In the first switching circuit, the first field effect transistor is an N-Metal-Oxide-Semiconductor (NMOS) transistor, the second field effect transistor is a P-Metal-Oxide-Semiconductor (PMOS) transistor, and the third field effect transistor is an NMOS transistor. For example, in the second switching circuit, the fourth field effect transistor is also an NMOS transistor, the fifth field effect transistor is a PMOS transistor, and the sixth field effect transistor is also an NMOS transistor, which may be replaced by an equivalent transistor in practical applications to implement the function of providing the first voltage, and the application is not limited thereto.

The following description will be given by way of example of at least two filters including two filters of a visible light filter and an infrared light filter. In a possible implementation manner, the optical filter assembly 310 may be similar to that shown in fig. 1, and two electrodes, a first electrode 311 and a second electrode 312 may be provided, the first switching circuit 302 is electrically connected to the first electrode 311, the second switching circuit 303 is electrically connected to the second electrode 312, when the first electrode 311 is a positive electrode of the first voltage and the second electrode 312 is a negative electrode of the first voltage, the first optical filter is currently used in the optical filter assembly 310, and when the first electrode 311 is a negative electrode of the first voltage and the second electrode 312 is a positive electrode of the first voltage, the second optical filter is currently used in the optical filter assembly 310. That is, if the currently used first optical filter in the optical filter assembly 310 is the first optical filter, after the controller 301 inputs the first PWM signal to the second switching circuit 303, the first electrode 311 is triggered to be the negative electrode of the first voltage, the second electrode 312 provides the first voltage to the electromagnetic device for the positive electrode of the first voltage, so that the polarity of the electromagnetic device in the optical filter assembly 310 at this time is opposite to the previous polarity, and the currently used first optical filter in the optical filter assembly 310 is driven to be switched to the second optical filter.

Optionally, the first filter may be a visible light filter, and the second filter may be an infrared light filter. That is, if the currently used visible light filter in the optical filter assembly 310 is a visible light filter, after the controller 301 inputs the first PWM signal to the second switching circuit 303, the first electrode 311 is triggered to be the negative electrode of the first voltage, the second electrode 312 is the positive electrode of the first voltage, and provides the first voltage to the electromagnetic device, so that the polarity of the electromagnetic device at this time is opposite to the previous polarity, and the currently used visible light filter in the optical filter assembly 310 is driven to be switched to the infrared light filter.

Alternatively, the first filter may be an infrared filter, and the second filter may be a visible light filter. That is, if the currently used ir filter in the filter assembly 310 is an ir filter, the controller 301 inputs the first PWM signal to the first switching circuit 302, and then triggers the first electrode 311 to be the positive electrode of the first voltage, and the second electrode 312 is the negative electrode of the first voltage to provide the first voltage to the electromagnetic device, so that the polarity of the electromagnetic device at this time is opposite to the previous polarity, and the currently used ir filter in the filter assembly 310 is driven to be switched to a visible light filter.

Optionally, the switching process may be triggered by the controller receiving a filter switching signal, where the filter switching signal is a signal for controlling switching of the currently used first filter to the second filter. That is, in this embodiment of the application, the controller may receive the optical filter switching signal sent by another processor or sensor, so as to trigger itself to input the first PWM signal to the first switching circuit or input the first PWM signal to the second switching circuit, thereby implementing switching of the optical filter.

For example, a sensor or other processor may acquire a change in the external environment. In the ICR that this application provided, can detect the change of external environment light through the photo resistance, when the resistance value of photo resistance is less than predetermineeing the threshold value, can regard external environment daytime, when the resistance value of photo resistance is not less than predetermineeing the threshold value, can regard external environment night. When the resistance values of the photoresistors are sequentially switched on two sides of the preset threshold value, the external environment is changed, and an optical filter switching signal can be sent to the controller. Alternatively, the filter switcher may use the visible light filter when the external environment is daytime, and the filter switcher may use the infrared light filter when the external environment is nighttime. That is, when the resistance value of the photoresistor changes from being not less than the preset threshold value to being less than the preset threshold value, it indicates that the optical filter switcher needs to use the visible light optical filter to trigger the optical filter switching signal, so that the controller controls the optical filter module to be switched from the currently used infrared optical filter to the visible light optical filter. When the resistance value of the photoresistor changes from being smaller than the preset threshold value to being not smaller than the preset threshold value, the optical filter switcher needs to use the infrared optical filter to trigger the optical filter switching signal, and therefore the controller controls the optical filter module to be switched from the currently used visible light optical filter to the infrared optical filter. It should be noted that the detection of the change in the external environment by the photo resistor is exemplary, and the manner of acquiring the filter switching signal is not limited in the present application.

For example, when the external environment is daytime, the filter switcher needs to use the visible light filter, the controller can input the first PWM signal to the first switching circuit to trigger the filter to switch from the infrared light filter to the visible light filter, and when the external environment is nighttime, the filter switcher needs to use the infrared light filter, the controller can input the first PWM signal to the second switching circuit to trigger the filter to switch from the visible light filter to the infrared light filter.

In a possible implementation manner, the control circuit may further include a maintaining circuit, the controller further includes a fifth output terminal, and the maintaining circuit includes a fifth input terminal and a sixth output terminal; the controller is electrically connected with the fifth input end through the fifth output end, and the maintaining circuit is electrically connected with the electromagnetic coil through the sixth output end; when the maintaining circuit receives a second PWM signal transmitted by the controller, the maintaining circuit provides a second voltage to the optical filter component to increase the electromagnetic force of the electromagnetic coil, so that the switched optical filter is in a fixed position.

Referring to fig. 4, a schematic diagram of a control circuit of fig. 3 according to an exemplary embodiment of the present application is shown. As shown in fig. 4, the control circuit 400 and the filter assembly 410 are included, and the control circuit 400 includes a controller 401, a first switching circuit 402, a second switching circuit 403 and a sustain circuit 404. The connection manner of the controller 401, the first switching circuit 402 and the second switching circuit 403 may refer to the description in fig. 3, and is not described herein again.

The controller 401 further includes a fifth output 401a, and the sustain circuit 404 includes a fifth input 404a and a sixth output 404 b; the controller 401 is electrically connected to the fifth input terminal 404a through the fifth output terminal 401a, and the sustain circuit 404 is electrically connected to one end of the electromagnetic coil through the sixth output terminal 404 b; after the controller 401 inputs the first PWM signal to the first switching circuit 401 to switch the optical filter assembly from the currently used first optical filter to the second optical filter, the controller 401 may further input a second PWM signal to the maintaining circuit 404, and when the maintaining circuit 404 receives the second PWM signal transmitted by the controller 401, the maintaining circuit 404 provides a second voltage to the optical filter assembly 410 to increase the electromagnetic force of the electromagnetic coil, so that the switched optical filter is in a fixed position.

That is, after the first switching circuit 402 drives the optical filter assembly 410 to switch from the currently used first optical filter to the second optical filter, the controller 401 inputs the second PWM signal to the maintaining circuit 404, which triggers the circuit in the maintaining circuit 404 that provides the second voltage to the electromagnetic coil to be turned on, and the maintaining circuit 404 and the optical filter assembly 410 are electrically connected to provide the second voltage to the electromagnetic coil, so as to increase the electromagnetic force of the electromagnetic device, and make the second optical filter be at the fixed position.

For example, the first filter is a visible light filter, and the second filter is an infrared light filter. After the currently used visible light filter in the driving filter assembly 410 is switched to the ir filter, the controller 401 inputs a second PWM signal to the maintaining circuit 404, so that the maintaining circuit 404 continuously provides a second voltage to the electromagnetic coil, and the electromagnetic coil generates an electromagnetic force through electromagnetic induction, thereby increasing an external force of the ir filter at a fixed position and improving the displacement resistance of the ir filter.

In another possible implementation case, the maintaining circuit may be further electrically connected to the other end of the electromagnetic coil through a sixth output terminal, that is, the maintaining circuit is disposed at the other end of the electromagnetic coil, when the first optical filter is an infrared optical filter, the second optical filter is a visible optical filter. After the infrared light filter in the driving filter assembly 410 is switched to the visible light filter, the controller 401 inputs a second PWM signal to the sustain circuit 404, so that the sustain circuit 330 continuously provides a second voltage to the electromagnetic coil, the electromagnetic coil generates an electromagnetic force through electromagnetic induction, which increases an external force of the visible light filter at a fixed position and improves the displacement resistance of the visible light filter. Optionally, the control circuit may also include two maintaining circuits, that is, the control circuit includes two maintaining circuits, one of the maintaining circuits is electrically connected to one end of the electromagnetic coil, and the other of the maintaining circuits is electrically connected to the other end of the electromagnetic coil, and the controller inputs a second PWM signal to the two maintaining circuits, so that one of the maintaining circuits continuously provides a second voltage to the electromagnetic coil, thereby increasing the electromagnetic force of the electromagnetic coil, and making the switched optical filter be in a fixed position, where the fixed position is the position of the optical filter after switching.

Optionally, the structure of the sustain circuit may be the same as that of the switch circuit, and is not described herein again.

In a possible implementation manner, the control circuit further includes a first feedback circuit, and the first feedback circuit is electrically connected to the controller and the optical filter assembly, respectively; the first feedback circuit is used for sending a first feedback signal to the controller when the temperature of the optical filter assembly is higher than a preset temperature threshold value so as to trigger the controller to adjust the signal parameter of the first PWM signal.

Referring to fig. 5, a schematic diagram of another control circuit of fig. 3 according to an exemplary embodiment of the present application is shown. As shown in fig. 5, the control circuit 500 includes a control circuit 500 and a filter assembly 510, and the control circuit 500 further includes a controller 501, a first switching circuit 502, a second switching circuit 503 and a first feedback circuit 504.

The connection among the filter assembly 510, the controller 501, the first switching circuit 502, and the second switching circuit 503 may refer to the manner shown in fig. 3, and is not described herein again. The first feedback circuit 504 is electrically connected to the controller 501 and the filter assembly 510, respectively, and the first feedback circuit 504 is used for acquiring the temperature of the filter assembly 510; the first feedback circuit 504 is further configured to send a first feedback signal to the controller 501 when the temperature of the filter assembly 510 is higher than a preset temperature threshold; the controller 501 is further configured to adjust a signal parameter of the first PWM signal according to the first feedback signal. Optionally, the signal parameter includes at least one of a PWM frequency and a duty cycle.

That is, whether the temperature of the optical filter assembly is higher than the preset temperature threshold is detected through the first feedback circuit, if the temperature of the optical filter assembly is higher than the preset temperature threshold, it is indicated that the temperature of the optical filter assembly is higher, a burnout phenomenon may occur, and at this time, the input current needs to be reduced, so that the effect of reducing the temperature is achieved.

For example, in the present application, in the electromagnetic ICR, the first voltage provided to the optical filter assembly by the first switching circuit is generally 3.3 volts (V), and the frequency and the duty cycle of the first PWM signal are 60 Hertz (HZ) and 50%, respectively, and when the first feedback circuit can obtain that the temperature of the optical filter assembly is higher than the preset temperature threshold, the controller can adjust the frequency and the duty cycle of the first PWM signal, so that the current passing through the optical filter assembly is smaller, thereby achieving the effect of reducing the temperature. Optionally, the first feedback circuit may also be applied to the maintaining circuit, that is, the second voltage provided by the maintaining circuit to the optical filter assembly in the electromagnetic ICR is generally 1.8 volts (V), and the frequency and the duty cycle of the second PWM signal are 60 Hertz (HZ) and 50%, respectively.

It should be noted that, when the at least two filters include three or more filters, the switching process may refer to an example of two filters in the embodiment of the present application, and details thereof are not repeated herein.

In summary, in the embodiment of the present application, the control circuit receives the first PWM signal transmitted by the controller through the first switching circuit or the second switching circuit, and provides the first voltage to the optical filter based on the first PWM signal to complete the switching of the optical filter, and in the process, the switching circuit is driven by using the first PWM signal, so that the switching circuit provides an intermittent voltage, thereby reducing a current flowing through the circuit in the switching process of the optical filter, reducing heat generation of the ICR, and improving the service life of the camera module.

In addition, in the embodiment of the application, the optical filter assembly includes an electromagnetic coil, and the electromagnetic coil is connected to one end of the electromagnetic coil through the first switching circuit and the second switching circuit, respectively, so as to form a loop for providing voltage to the electromagnetic coil, thereby providing voltage to the optical filter assembly, and improving the management efficiency of the controller on the first switching circuit and the second switching circuit.

In addition, in the embodiment of the application, through the electrical connection between the controller and the maintaining circuit, the electromagnetic force of the electromagnetic coil is increased by providing the second PWM signal to the switched maintaining circuit, so that the stability of the optical filter is improved, the current output by the maintaining circuit is reduced, the heat generation is reduced, and the service life of the camera module is prolonged.

In addition, in the embodiment of the present application, the signal parameter of the first PWM signal is adjusted by adjusting the parameter of the first PWM signal through the controller, so that the flexibility of the application of the scheme of the present application is increased.

In a possible implementation manner, the control circuit may be applied to a camera module, and the camera module may include a control circuit for controlling switching of the optical filter as shown in any one or more of fig. 2, fig. 3, fig. 4, or fig. 5, so as to control switching of the self optical filter.

In a possible implementation manner, the camera module may be applied to a terminal device, and the terminal device may include at least one camera module as described above. That is, the terminal device may be a terminal device to which the camera module can be mounted.

For example, the terminal device may be a vehicle-mounted device, for example, a driving computer with a video recording function, or a wireless communication device externally connected to the driving computer.

Alternatively, the terminal device may be a roadside device, for example, a street lamp, a signal lamp or other roadside device with a monitoring function.

Alternatively, the terminal equipment may be user terminal equipment such as mobile telephones (or "cellular" telephones) and computers with mobile terminal equipment, for example, portable, pocket, hand-held, computer-included or vehicle-mounted mobile devices. For example, a Station (STA), a subscriber unit (subscriber unit), a subscriber Station (subscriber Station), a mobile Station (mobile), a remote Station (remote Station), an access point (ap), a remote terminal (remote terminal), an access terminal (access terminal), a user equipment (user terminal), a user agent (user agent), a user equipment (user device), or a User Equipment (UE). For example, the terminal device may be a mobile phone, a tablet computer, an e-book reader, smart glasses, a smart watch, an MP4(Moving Picture Experts Group Audio Layer IV) player, a notebook computer, a laptop computer, a desktop computer, and the like.

In the terminal device, when the terminal device detects that the environment is switched from daytime to nighttime, the terminal device inputs a first PWM signal to the first switching circuit through a controller in the control circuit, and the first switching circuit provides a voltage of 3.3V to the optical filter assembly based on the first PWM signal, so that the optical filter is switched.

Please refer to fig. 6, which illustrates a schematic diagram of a PWM signal according to an embodiment of the present application. As shown in fig. 6, the first PWM signal 601 input to VP1 and the first PWM signal 602 input to VP2 are included. Wherein VP1 denotes an input terminal of the first switching circuit, which is electrically connected to a first output terminal of the controller, VP2 denotes an input terminal of the second switching circuit, which is electrically connected to a second output terminal of the controller, VO1 denotes an output terminal of the first switching circuit, and VO2 denotes an output terminal of the second switching circuit. When the terminal device detects that the environment is switched from daytime to nighttime, the first PWM signal 601 input from the first output terminal of the controller to VP1 provides the first voltage to the filter assembly in the form of VO1 being at high level and VO2 being at low level. When the terminal device detects that the environment is switched from night to day, the first PWM signal 602, which is input to VP2 through the first output terminal of the controller, provides the first voltage to the filter assembly in the form of VO1 being at low level and VO2 being at high level. The 250 milliseconds in the figure are exemplary.

Optionally, if the optical filter assembly further includes a maintaining circuit, the controller may further input a second PWM signal to the maintaining circuit after the switching of the optical filter is completed, so that the maintaining circuit may also provide a second voltage to the optical filter assembly. The operation of the sustain circuit can refer to the description in fig. 4, and is not described herein again.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Those skilled in the art should also appreciate that the embodiments described in this specification are all alternative embodiments and that the acts and modules involved are not necessarily required for this application.

In various embodiments of the present application, it should be understood that the size of the serial number of each process described above does not mean that the execution sequence is necessarily sequential, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated units, if implemented as software functional units and sold or used as a stand-alone product, may be stored in a computer accessible memory. Based on such understanding, the technical solution of the present application, which is a part of or contributes to the prior art in essence, or all or part of the technical solution, may be embodied in the form of a software product, stored in a memory, including several requests for causing a computer device (which may be a personal computer, a server, a network device, or the like, and may specifically be a processor in the computer device) to execute part or all of the steps of the above-described method of the embodiments of the present application.

The control circuit, the camera module and the terminal device disclosed in the embodiment of the present application are introduced by way of example, and an example is applied in the present application to explain the principle and the implementation manner of the present application, and the description of the above embodiment is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. The control circuit is applied to a camera module, wherein the camera module comprises an optical filter assembly, and the optical filter assembly comprises at least two optical filters; the control circuit includes: the optical filter assembly comprises a controller, a first switching circuit and a second switching circuit, wherein the controller is electrically connected with the first switching circuit and the second switching circuit respectively, and the optical filter assembly is electrically connected with the first switching circuit and the second switching circuit respectively;

2. The control circuit of claim 1, wherein the controller comprises a first output and a second output, wherein the first switching circuit comprises a first input, and wherein the second switching circuit comprises a second input; the first output end is electrically connected with the first input end, and the second output end is electrically connected with the second input end;

3. The control circuit of claim 2, wherein the first switching circuit further comprises a third output, the second switching circuit further comprises a fourth output, the optical filter assembly further comprises a third input and a fourth input;

4. The control circuit according to claim 2 or 3, wherein the first switching circuit comprises a first power supply, a first field effect transistor, a second field effect transistor, a third field effect transistor and a first resistance device;

the source electrode of the second field effect transistor is grounded;

the source electrode of the third field effect transistor is grounded;

5. The control circuit according to claim 2 or 3, wherein the second switching circuit comprises a second power supply, a fourth field effect transistor, a fifth field effect transistor, a sixth field effect transistor and a second resistance device;

the source electrode of the fifth field effect transistor is grounded;

the source electrode of the sixth field effect transistor is grounded;

6. The control circuit of claim 3, further comprising a sustain circuit, the controller further comprising a fifth output, the sustain circuit comprising a fifth input and a sixth output;

the controller is electrically connected with the fifth input end through the fifth output end, and the maintaining circuit is electrically connected with one end of the electromagnetic coil through the sixth output end;

7. The control circuit of any of claims 1 to 3, further comprising a first feedback circuit electrically connected to the controller and the filter assembly, respectively;

8. The control circuit of claim 7, wherein the signal parameter comprises at least one of a PWM frequency and a duty cycle.

9. A camera module, characterized in that it comprises at least one control circuit according to any one of claims 1 to 8.

10. A terminal device, characterized in that it comprises at least one camera module according to claim 9.