Camera module control circuit

Abstract

The application relates to a camera module control circuit. The camera module control circuit comprises a temperature detection element, a reset circuit, a camera module and a memory gating circuit. The temperature detection element is used for detecting the temperature of the camera module and generating a temperature signal. The memory gating circuit is used for gating the target storage element and the camera module according to the temperature signal. The reset circuit is used for generating a reset signal according to the temperature signal. The camera module is used for restarting according to the reset signal and running based on the running parameters corresponding to the target storage element after the restart. By acquiring the temperature of the camera module, adjusting the running parameters of the camera module according to the temperature of the camera module, adjusting the power consumption of the camera module, reducing the heat generated by the camera module and avoiding the continuous work of the camera module in the high-temperature condition, the quality of the image generated by the camera module is improved.

Description

Technical Field

[0001] This application relates to the field of imaging technology, and in particular to a camera module control circuit. Background Technology

[0002] A camera module, also known as a webcam module or camera assembly, is a miniaturized imaging system that integrates and packages multiple key components together. With the development of smart technology, camera modules are being used in various scenarios, such as smartphones, tablets, laptops, security cameras, automobiles, and drones.

[0003] In current technologies, camera modules generate heat during use. Continuous operation of the camera module under high temperatures can cause abnormalities in the images it generates. Utility Model Content

[0004] Therefore, it is necessary to provide a camera module control circuit to address the aforementioned technical problems.

[0005] This application provides a camera module control circuit, comprising: a temperature detection element, a reset circuit, a camera module, and a memory selection circuit; the temperature detection element is connected to both the reset circuit and the memory selection circuit, and is used to detect the temperature of the camera module and generate a temperature signal, which is then transmitted to both the reset circuit and the memory selection circuit; the memory selection circuit includes multiple storage elements and is connected to the data terminal of the camera module, and is used to select a target storage element from the camera module based on the temperature signal; each storage element stores a set of operating parameters for the camera module, with different operating parameters corresponding to different power consumption of the camera module; the reset circuit is connected to the reset terminal of the camera module, and is used to generate a reset signal based on the temperature signal and transmit the reset signal to the camera module; the camera module is used to restart based on the reset signal and, after restarting, operates based on the operating parameters corresponding to the target storage element.

[0006] In one embodiment, the temperature signal initially output by the temperature detection element is a first level; when the temperature signal is at the first level, if the current temperature is greater than a first temperature threshold, the temperature signal output by the temperature detection element changes to a second level; when the temperature signal is at the second level, if the current temperature is less than a second temperature threshold, the temperature signal output by the temperature detection element changes back to the first level; the first temperature threshold is greater than the second temperature threshold.

[0007] In one embodiment, the memory selection circuit includes: a first memory circuit and a second memory circuit; the power supply terminal of the first memory circuit is connected to an external power source, the data terminal of the first memory circuit is connected to the data terminal of the camera module, and the control terminal of the first memory circuit is connected to the temperature detection element; when the temperature signal is at the first level, the first memory circuit is selected by the camera module; the power supply terminal of the second memory circuit is connected to an external power source, the data terminal of the second memory circuit is connected to the data terminal of the camera module, and the control terminal of the second memory circuit is connected to the temperature detection element; when the temperature signal is at the second level, the second memory circuit is selected by the camera module.

[0008] In one embodiment, the first memory circuit includes: a first switching element and a first memory; a first end of the first switching element is connected to an external power supply, a second end of the first switching element is connected to one end of the first memory, and a control end of the first switching element is connected to the temperature detection element; when the temperature signal is at the first level, the first switching element is in a conducting state; the other end of the first memory is connected to the data end of the camera module.

[0009] In one embodiment, the second memory circuit includes: a second switching element and a second memory; a first end of the second switching element is connected to an external power supply, a second end of the second switching element is connected to one end of the second memory, and a control end of the second switching element is connected to the temperature detection element; when the temperature signal is at a second level, the second switching element is in a conducting state; the other end of the second memory is connected to the data end of the camera module.

[0010] In one embodiment, the memory selection circuit includes a third memory circuit and a fourth memory circuit; the data terminal of the third memory circuit is connected to the data terminal of the camera module, and the control terminal of the third memory circuit is connected to the temperature detection element; when the temperature signal is at the first level, the third memory circuit is selected by the camera module; the data terminal of the fourth memory circuit is connected to the data terminal of the camera module, and the control terminal of the fourth memory circuit is connected to the temperature detection element; when the temperature signal is at the second level, the fourth memory circuit is selected by the camera module.

[0011] In one embodiment, the third memory circuit includes a third switching element and a third memory; a first terminal of the third switching element is connected to the data terminal of the camera module, a second terminal of the third switching element is connected to the data terminal of the third memory, and a control terminal of the third switching element is connected to the temperature detection element; when the temperature signal is at the first level, the third switching element is in a conducting state.

[0012] In one embodiment, the fourth memory circuit includes: a fourth switching element and a fourth memory; a first terminal of the fourth switching element is connected to the data terminal of the camera module, a second terminal of the fourth switching element is connected to the data terminal of the fourth memory, and a control terminal of the third switching element is connected to the temperature detection element; when the temperature signal is at a second level, the fourth switching element is in a conducting state.

[0013] In one embodiment, the reset circuit includes: a rising edge detection circuit and a falling edge detection circuit; one end of the rising edge detection circuit is connected to the temperature detection element, and the other end is connected to the reset terminal of the camera module; it is used to generate a reset signal based on the rising edge of the temperature signal and transmit the reset signal to the camera module; one end of the falling edge detection circuit is connected to the temperature detection element, and the other end is connected to the reset terminal of the camera module; it is used to generate a reset signal based on the falling edge of the temperature signal and transmit the reset signal to the camera module.

[0014] In one embodiment, the rising edge detection circuit includes: a first resistor, a second resistor, a first capacitor, a first Schmitt trigger, and a NOT gate; one end of the first resistor is connected to the temperature detection element, and the other end of the first resistor is connected to the reset terminal of the camera module in sequence through the first capacitor, the first Schmitt trigger, and the NOT gate; one end of the second resistor is connected to the connection point of the first capacitor and the first Schmitt trigger, and the other end of the second resistor is connected to an external power supply; the falling edge detection circuit includes: a third resistor, a fourth resistor, a second capacitor, and a second Schmitt trigger; one end of the third resistor is connected to the temperature detection element, and the other end of the third resistor is connected to the reset terminal of the camera module in sequence through the second capacitor and the second Schmitt trigger; one end of the fourth resistor is connected to the connection point of the second capacitor and the second Schmitt trigger, and the other end of the fourth resistor is grounded.

[0015] The aforementioned camera module control circuit includes: a temperature detection element, a reset circuit, a camera module, and a memory selection circuit. The temperature detection element is connected to both the reset circuit and the memory selection circuit, and is used to detect the temperature of the camera module and generate a temperature signal, which is then transmitted to both the reset circuit and the memory selection circuit. The memory selection circuit includes multiple storage elements and is connected to the data terminal of the camera module. It is used to select the target storage element from the camera module based on the temperature signal. The reset circuit is connected to the reset terminal of the camera module and is used to generate a reset signal based on the temperature signal, which is then transmitted to the camera module. The camera module restarts based on the reset signal and, after restarting, operates based on the operating parameters corresponding to the target storage element. Each storage element stores a set of operating parameters for the camera module; different operating parameters correspond to different power consumption levels for the camera module. By acquiring the temperature of the camera module, the operating parameters of the camera module are adjusted accordingly, thereby adjusting the power consumption of the camera module, reducing the heat generated by the camera module, and preventing the camera module from continuously operating under high temperature conditions, thus improving the quality of the images generated by the camera module. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the camera module control circuit in one embodiment;

[0017] Figure 2 This is a circuit diagram of the camera module control circuit in one embodiment;

[0018] Figure 3 This is a circuit diagram of the camera module control circuit in another embodiment. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] Based on the embodiments provided in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, some design, manufacturing, or production modifications based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0021] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0022] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “a,” “an,” “an,” “the,” and similar words used in this application do not indicate quantity limitation and may indicate singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms “connected,” “linked,” “coupled,” and similar words used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Multiple” used in this application means two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. The terms “first,” “second,” “third,” etc., used in this application are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0023] A camera module, also known as a camera module or video camera module, is a miniaturized imaging system that integrates and packages multiple key components together. With the development of intelligent technology, camera modules are applied in various scenarios, such as smartphones, tablets, laptops, security cameras, automobiles, and drones. In the automotive field, as the automotive industry evolves, the operating environment for camera modules is becoming increasingly demanding. To ensure safety and adaptability to all usage scenarios, the industry has placed higher requirements on the design of camera modules with active cooling to ensure usability in all environments.

[0024] In one embodiment, such as Figure 1 As shown, the camera module control circuit includes: a temperature detection element 100, a reset circuit 200, a camera module 300, and a memory selection circuit 400.

[0025] Temperature sensing element 100 is connected to reset circuit 200 and memory selection circuit 400 respectively, and is used to detect the temperature of camera module 300 and generate a temperature signal, which is then transmitted to reset circuit 200 and memory selection circuit 400 respectively. It is understood that temperature sensing element 100 needs to be set within a preset range of camera module 300, or directly inside camera module 300. This embodiment does not specifically limit the setting position of temperature sensing element 100, only requiring that temperature sensing element 100 can detect the temperature of camera module 300. Temperature sensing element 100 can detect the current temperature of camera module 300 in real time and generate an electrical signal representing the temperature status as a temperature signal. Temperature sensing element 100 can be a thermistor, digital temperature sensor, or other arbitrary temperature sensing element. This embodiment does not make specific limitations, only requiring that temperature sensing element 100 can detect the temperature of camera module 300. After generating a temperature signal, the temperature sensing element 100 transmits the temperature signal to the reset circuit 200 and the memory selection circuit 400, respectively. The temperature signal can be a temperature signal composed of temperature values ​​at various times. The temperature signal can also be a temperature signal composed of a first level and a second level, wherein the first level indicates that the current temperature has not exceeded the high temperature threshold, and the second level indicates that the current temperature has exceeded the high temperature threshold.

[0026] The memory selection circuit 400 is connected to the data terminal of the camera module 300 and is used to select the target storage element and the camera module 300 based on the temperature signal. The memory selection circuit 400 includes multiple storage elements, each storing a set of operating parameters for the camera module 300. Different operating parameters correspond to different power consumption of the camera module 300. Each storage element in the memory selection circuit 400 stores a set of operating parameters; the power consumption of the camera module 300 varies depending on the set of operating parameters. For example, the memory selection circuit 400 includes two storage elements: the first storage element stores the first set of operating parameters; the second storage element stores the second set of operating parameters. The power consumption of the camera module 300 when operating with the first set of operating parameters is greater than the power consumption of the camera module 300 when operating with the second set of operating parameters. After acquiring the temperature signal, the memory selection circuit 400 selects the target storage element and the camera module 300 based on the temperature signal, thereby enabling the camera module 300 to obtain operating parameters from the target storage element and operate. The target storage element is the storage element that stores operating parameters matching the current temperature signal. If the temperature signal is composed of temperature values ​​at various times, when the temperature value is greater than a high-temperature threshold, a second storage element is selected and connected to the camera module 300. Since the power consumption of the second set of operating parameters is lower, the temperature of the camera module 300 can be reduced. When the temperature value is less than the high-temperature threshold, the first storage element is selected and connected to the camera module 300. Since the temperature is not exceeded, the camera module 300 operates based on the first set of operating parameters, which can improve the imaging quality of the camera module 300. If the temperature signal is composed of a first level and a second level, when the temperature signal is at the second level, the second storage element is selected by the camera module 300. Since the power consumption of the second set of operating parameters is lower, the temperature of the camera module 300 can be reduced. When the temperature signal is at the first level, the first storage element is selected by the camera module 300. Since the temperature is not over-temperature at this time, the camera module 300 operates based on the first set of operating parameters, which can improve the imaging quality of the camera module 300.

[0027] The reset circuit 200 is connected to the reset terminal of the camera module 300. It generates a reset signal based on the temperature signal and transmits the reset signal to the camera module 300. If the temperature signal is composed of temperature values ​​at various times, a reset signal is generated when the temperature value is greater than the high-temperature threshold. When the temperature is greater than the high-temperature threshold, the camera module 300 needs to switch from the first set of operating parameters to the second set of operating parameters; therefore, a reset signal is generated to restart the camera module 300 and switch the operating parameters. Similarly, a reset signal is generated when the temperature value is less than the high-temperature threshold. When the temperature is less than the high-temperature threshold, the camera module needs to switch from the second set of operating parameters to the first set of operating parameters; therefore, a reset signal is generated to restart the camera module 300 and switch the operating parameters. If the temperature signal is composed of a first level and a second level, a reset signal is generated when the temperature signal changes from the first level to the second level, or from the second level to the first level, that is, when the temperature signal has a rising edge or a falling edge. When the temperature signal shows a rising edge or a falling edge, it indicates that the operating parameters need to be switched. Therefore, a reset signal needs to be generated to restart the camera module 300, thereby switching the operating parameters.

[0028] The camera module 300 is connected to the memory gating circuit 400 and the reset circuit 200 respectively. The camera module 300 is used to restart according to the reset signal and to run based on the running parameters corresponding to the target storage element after restarting.

[0029] The camera module control circuit in this embodiment includes: a temperature detection element 100, a reset circuit 200, a camera module 300, and a memory selection circuit 400. The temperature detection element 100 is connected to both the reset circuit 200 and the memory selection circuit 400, and is used to detect the temperature of the camera module 300, generate a temperature signal, and transmit the temperature signal to both the reset circuit 200 and the memory selection circuit 400. The memory selection circuit 400 includes multiple storage elements and is connected to the data terminal of the camera module 300, used to select the target storage element from the camera module 300 based on the temperature signal. The reset circuit 200 is connected to the reset terminal of the camera module 300, used to generate a reset signal based on the temperature signal, and transmit the reset signal to the camera module 300. The camera module 300 restarts based on the reset signal and, after restarting, operates based on the operating parameters corresponding to the target storage element. Each storage element stores a set of operating parameters for the camera module 300. Different operating parameters correspond to different power consumption of the camera module 300. By acquiring the temperature of the camera module 300, the operating parameters are adjusted accordingly, thereby regulating the power consumption of the camera module 300, reducing the heat generated by the camera module 300, and preventing the camera module 300 from continuously operating under high-temperature conditions, thus improving the quality of the images generated by the camera module 300.

[0030] Temperature is monitored in real time by temperature detection element 100, automatic reset is achieved by reset circuit 200, and operating parameters are dynamically switched by memory selection circuit 400. The camera module 300 adjusts the operating status according to the parameters, thereby dynamically adjusting the operating parameters according to temperature changes to prevent image abnormalities caused by high temperature, further improving image quality and enhancing system stability and imaging reliability.

[0031] In one embodiment, the temperature signal initially output by the temperature sensing element 100 is at a first level. When the temperature signal is at the first level, if the current temperature is greater than a first temperature threshold, the temperature signal output by the temperature sensing element 100 changes to a second level; when the temperature signal is at the second level, if the current temperature is less than a second temperature threshold, the temperature signal output by the temperature sensing element 100 changes back to the first level. The first temperature threshold is greater than the second temperature threshold.

[0032] The temperature detection element 100 is preset with a first temperature threshold and a second temperature threshold. The first temperature threshold is used as a condition to determine if the temperature increases when the temperature signal changes from a first level to a second level; the second temperature threshold is used as a condition to determine if the temperature decreases when the temperature signal changes from a second level to a first level. Specifically, after the camera module 300 is initialized and starts operating, the initial temperature signal output by the temperature detection element 100 is at the first level. During the real-time operation of the camera module 300, the temperature signal is at the first level. The first storage element is selected by the camera module 300, and the camera module 300 operates with the first set of operating parameters. The temperature detection element 100 detects the current temperature of the camera module 300 in real time. If the current temperature is greater than the first temperature threshold, the temperature signal output by the temperature detection element 100 changes to the second level. The second storage element is selected by the camera module 300, and after restarting with a reset signal, the camera module 300 operates with the second set of operating parameters. The temperature detection element 100 detects the current temperature of the camera module 300 in real time. If the current temperature is less than the second temperature threshold, the temperature signal output by the temperature detection element 100 changes to the first level. The first storage element is selected by the camera module 300, and after restarting with a reset signal, the camera module 300 operates with the first set of operating parameters. This process is repeated to automatically adjust the operating parameters of the camera module 300 according to the current temperature.

[0033] Understandably, the initial temperature signal output by the temperature sensing element 100 can also be at a second level. When the temperature signal is at the second level, if the current temperature is less than a second temperature threshold, the temperature signal output by the temperature sensing element 100 changes to a first level. When the temperature signal is at the first level, if the current temperature is greater than a first temperature threshold, the temperature signal output by the temperature sensing element 100 changes to a second level.

[0034] Understandably, when the temperature sensing element 100 initially outputs a temperature signal, it can first detect the initial temperature of the camera module. If the initial temperature is greater than or equal to the first temperature threshold, the initial output temperature signal is at the second level; if the initial temperature is less than the first temperature threshold, the initial output temperature signal is at the first level.

[0035] The first and second temperature thresholds can be set according to actual usage requirements. This embodiment does not impose specific limitations, only requiring that the first temperature threshold is greater than the second temperature threshold.

[0036] This embodiment achieves dynamic monitoring and stable control of the camera module 300's temperature status by setting a dual threshold switching mechanism. This avoids frequent signal flipping when the temperature fluctuates near the threshold, thus improving system stability. Timely adjustment of the operating strategy before the temperature becomes too high effectively prevents image anomalies caused by high temperatures, improving image quality and system reliability.

[0037] In one embodiment, such as Figure 2 As shown, the memory selection circuit 400 includes a first memory circuit 410 and a second memory circuit 420.

[0038] The first memory circuit 410 includes a first memory 412, which stores a first set of operating parameters. The second memory circuit 420 includes a second memory 422, which stores a second set of operating parameters. The power consumption of the camera module 300 when operating with the first set of operating parameters is greater than the power consumption of the camera module 300 when operating with the second set of operating parameters.

[0039] The power supply terminal of the first memory circuit 410 is connected to an external power source, the data terminal of the first memory circuit 410 is connected to the data terminal of the camera module 300, and the control terminal of the first memory circuit 410 is connected to the temperature detection element 100. When the temperature signal is at the first level, the first memory circuit 410 and the camera module 300 are selected.

[0040] When the temperature signal received at the control terminal of the first memory circuit 410 is at a first level, the external power supply supplies power to the first memory circuit 410, thereby enabling the first memory circuit 410 to connect with the camera module 300. When the temperature signal received at the control terminal of the first memory circuit 410 is at a second level, the external power supply stops supplying power to the first memory circuit 410, and at this time, the first memory circuit disconnects from the camera module 300. When the temperature signal is at the first level, the first memory circuit 410 connects with the camera module 300, and the first memory 412 in the first memory circuit 410 stores a first set of operating parameters, which are also high-power operating parameters. When the temperature signal is at the first level, since the camera module 300 is not overheating, the camera module 300 operates based on the first set of operating parameters, which can improve the imaging quality of the camera module 300.

[0041] The first memory circuit 410 includes: a first switching element 411 and a first memory 412; a first end of the first switching element 411 is connected to an external power supply, a second end of the first switching element 411 is connected to one end of the first memory 412, and a control end of the first switching element 411 is connected to a temperature detection element 100; when the temperature signal is at a first level, the first switching element 411 is in a conducting state; the other end of the first memory 412 is connected to the data end of the camera module 300.

[0042] In this design, the first switching element 411 can be a PMOS transistor, and the first memory 412 can be an EEPROM (Electrically Erasable Programmable Read-Only Memory). The first terminal of the first switching element 411 is the source of the PMOS transistor, the second terminal is the drain of the PMOS transistor, and the control terminal is the gate of the PMOS transistor. The first voltage level is low. When the gate of the first switching element 411 is connected to a low voltage level, the first switching element 411 is turned on, and the external power supply supplies power to the first memory 412, thereby enabling the first memory 412 to be selected by the camera module 300. The first memory 412 stores a first set of operating parameters, i.e., high-power operating parameters. At this time, the camera module 300 operates based on the first set of operating parameters. When the gate of the first switching element 411 is connected to a second voltage level, which is high, the first switching element 411 is turned off, and the first memory 412 is disconnected from the camera module 300.

[0043] The power supply terminal of the second memory circuit 420 is connected to an external power source, the data terminal of the second memory circuit 420 is connected to the data terminal of the camera module 300, and the control terminal of the second memory circuit 420 is connected to the temperature detection element 100. When the temperature signal is at the second level, the second memory circuit 420 and the camera module 300 are selected.

[0044] When the temperature signal received at the control terminal of the second memory circuit 420 is at the second level, the external power supply supplies power to the second memory circuit 420, thereby enabling the second memory circuit 420 to be connected to the camera module 300. When the temperature signal received at the control terminal of the second memory circuit 420 is at the first level, the external power supply stops supplying power to the second memory circuit 420, and at this time, the second memory circuit 420 is disconnected from the camera module 300. When the temperature signal is at the second level, the second memory circuit 420 is connected to the camera module 300, and the second memory 422 in the second memory circuit 420 stores the second set of operating parameters, which are also the low-power operating parameters. When the temperature signal is at the second level, since the camera module 300 has exceeded its operating temperature, the camera module 300 operates based on the second set of operating parameters, reducing the power consumption of the camera module 300 and thus reducing the temperature of the camera module 300.

[0045] The second memory circuit 420 includes a second switching element 421 and a second memory 422; the first end of the second switching element 421 is connected to an external power supply, the second end of the second switching element 421 is connected to one end of the second memory 422, and the control end of the second switching element 421 is connected to the temperature detection element 100; when the temperature signal is at the second level, the second switching element 421 is in the on state; the other end of the second memory 422 is connected to the data end of the camera module 300.

[0046] In this design, the second switching element 421 can be an NMOS transistor, and the second memory 422 can be an EEPROM (Electrically Erasable Programmable Read-Only Memory). The first terminal of the second switching element 421 is the drain of the NMOS transistor, the second terminal is the source of the NMOS transistor, and the control terminal is the gate of the NMOS transistor. The second level is high. When the gate of the second switching element 421 is connected to a high level, the second switching element 421 is turned on, and the external power supply supplies power to the second memory 422, thereby enabling the second memory 422 to be selected by the camera module 300. The second memory 422 stores a second set of operating parameters, namely low-power operating parameters, and the camera module 300 operates based on the second set of operating parameters. When the gate of the second switching element 421 is connected to a first level, which is low, the first switching element 411 is turned off, and the second memory 422 is disconnected from the camera module 300.

[0047] In one embodiment, such as Figure 3 As shown, the memory selection circuit 400 includes a third memory circuit 430 and a fourth memory circuit 440.

[0048] The third memory circuit 430 includes a third memory 432, which stores the first set of operating parameters. The fourth memory circuit 440 includes a fourth memory 442, which stores the second set of operating parameters. The power consumption of the camera module 300 when operating with the first set of operating parameters is greater than the power consumption of the camera module 300 when operating with the second set of operating parameters.

[0049] The data terminal of the third memory circuit 430 is connected to the data terminal of the camera module 300, and the control terminal of the third memory circuit 430 is connected to the temperature detection element 100; when the temperature signal is at the first level, the third memory circuit 430 and the camera module 300 are selected.

[0050] When the temperature signal is at the first level, the third memory circuit 430 is connected to the camera module 300. The third memory 432 in the third memory circuit 430 stores the first set of operating parameters, which are also the high-power operating parameters. When the temperature signal is at the first level, since the camera module 300 is not overheating, it operates based on the first set of operating parameters, which can improve the imaging quality of the camera module 300. When the temperature signal is at the second level, the third memory circuit 430 is disconnected from the camera module 300.

[0051] The third memory circuit 430 includes a third switching element 431 and a third memory 432; the first end of the third switching element 431 is connected to the data end of the camera module 300, the second end of the third switching element 431 is connected to the data end of the third memory 432, and the control end of the third switching element 431 is connected to the temperature detection element 100; when the temperature signal is at the first level, the third switching element 431 is in the on state.

[0052] In this design, the third switching element 431 can be a PMOS transistor, and the third memory 432 can be a Flash memory. The first terminal of the third switching element 431 is the source of the PMOS transistor, the second terminal is the drain of the PMOS transistor, and the control terminal is the gate of the PMOS transistor. The first voltage level is low. When the gate of the third switching element 431 is connected to a low voltage level, the third switching element 431 is turned on, and the third memory 432 is selected by the camera module 300. The third memory 432 stores the first set of operating parameters, i.e., high-power operating parameters. At this time, the camera module 300 operates based on the first set of operating parameters. When the gate of the third switching element 431 is connected to a second voltage level, which is high, the third switching element 431 is turned off, and the third memory 432 is disconnected from the camera module 300.

[0053] The data terminal of the fourth memory circuit 440 is connected to the data terminal of the camera module 300, and the control terminal of the fourth memory circuit 440 is connected to the temperature detection element 100; when the temperature signal is at the second level, the fourth memory circuit 440 and the camera module 300 are selected.

[0054] When the temperature signal is at the second level, the fourth memory circuit 440 is connected to the camera module 300. The fourth memory 442 in the fourth memory circuit 440 stores the second set of operating parameters, which are also the low-power operating parameters. When the temperature signal is at the second level, since the camera module 300 has exceeded its operating temperature, the camera module 300 operates based on the second set of operating parameters, reducing the power consumption of the camera module 300 and thus reducing the temperature of the camera module 300. When the temperature signal is at the first level, the fourth memory circuit 440 is disconnected from the camera module 300.

[0055] The fourth memory circuit 440 includes a fourth switching element 441 and a fourth memory 442; the first end of the fourth switching element 441 is connected to the data end of the camera module 300, the second end of the fourth switching element 441 is connected to the data end of the fourth memory 442, and the control end of the fourth switching element 441 is connected to the temperature detection element 100; when the temperature signal is at the second level, the fourth switching element 441 is in the on state.

[0056] In this design, the fourth switching element 441 can be an NMOS transistor, and the fourth memory 442 can be a Flash memory. The first terminal of the fourth switching element 441 is the drain of the NMOS transistor, the second terminal is the source of the NMOS transistor, and the control terminal is the gate of the NMOS transistor. The second voltage level is high. When the gate of the fourth switching element 441 is connected to a high voltage level, the fourth switching element 441 is turned on, and the fourth memory 442 is selected by the camera module 300. The fourth memory 442 stores the second set of operating parameters, i.e., low-power operating parameters. At this time, the camera module 300 operates based on the second set of operating parameters. When the gate of the fourth switching element 441 is connected to a first voltage level, which is low, the fourth switching element 441 is turned off, and the fourth memory 442 is disconnected from the camera module 300.

[0057] In one embodiment, such as Figure 2 as well as Figure 3 As shown, the reset circuit 200 includes a rising edge detection circuit 210 and a falling edge detection circuit 220.

[0058] One end of the rising edge detection circuit 210 is connected to the temperature detection element 100, and the other end is connected to the reset terminal of the camera module 300; it is used to generate a reset signal based on the rising edge in the temperature signal and transmit the reset signal to the camera module 300.

[0059] The rising edge detection circuit 210 includes: a first resistor R1, a second resistor R2, a first capacitor C1, a first Schmitt trigger N1, and a NOT gate M. One end of the first resistor R1 is connected to the temperature detection element 100, and the other end of the first resistor R1 is connected to the reset terminal of the camera module 300 in sequence through the first capacitor C1, the first Schmitt trigger N1, and the NOT gate M; one end of the second resistor R2 is connected to the connection point of the first capacitor C1 and the first Schmitt trigger N1, and the other end of the second resistor R2 is connected to an external power supply.

[0060] When the first Schmitt trigger N1 detects a rising edge in the temperature signal, it generates a high-level pulse. After passing through the NOT gate M, the high-level pulse outputs a low-level pulse, which serves as the reset signal. The reset terminal of the camera module 300 resets and restarts upon receiving the reset signal. The second resistor R2 is connected to an external power supply, enabling the first Schmitt trigger N1 to detect the rising edge in the temperature signal. The first capacitor C1 is used to adjust the pulse width of the high-level pulse generated by the first Schmitt trigger N1.

[0061] One end of the falling edge detection circuit 220 is connected to the temperature detection element 100, and the other end is connected to the reset terminal of the camera module 300; it is used to generate a reset signal based on the falling edge in the temperature signal and transmit the reset signal to the camera module 300.

[0062] The falling edge detection circuit 220 includes: a third resistor R3, a fourth resistor R4, a second capacitor C2, and a second Schmitt trigger N2; one end of the third resistor R3 is connected to the temperature detection element 100, and the other end of the third resistor R3 is connected to the reset terminal of the camera module 300 through the second capacitor C2 and the second Schmitt trigger N2 in sequence; one end of the fourth resistor R4 is connected to the connection point of the second capacitor C2 and the second Schmitt trigger N2, and the other end of the fourth resistor R4 is grounded.

[0063] When the second Schmitt trigger N2 detects a falling edge in the temperature signal, it generates a low-level pulse, which serves as the reset signal. The reset terminal of the camera module 300 resets and restarts upon receiving the reset signal. The fourth resistor R4 is grounded, enabling the second Schmitt trigger N2 to detect the falling edge in the temperature signal. The second capacitor C2 is used to adjust the pulse width of the low-level pulse generated by the second Schmitt trigger N2.

[0064] Figure 2 The camera module control circuit shown determines whether the current temperature exceeds the high-temperature threshold set by the temperature sensor when the camera module 300 starts. If the current temperature exceeds the high-temperature threshold set by the temperature sensor, the temperature sensor output signal switches the MOSFET to power supply to the EEPROM storing low-power operating parameters. The camera module 300 then retrieves the low-power operating parameters from the EEPROM and starts image processing. If the current temperature does not exceed the high-temperature threshold set by the temperature sensor, the temperature sensor output signal switches the MOSFET to power supply to the EEPROM storing high-power operating parameters. The camera module 300 then retrieves the high-power operating parameters from the EEPROM and starts image processing.

[0065] When the camera module 300 is operating with high power consumption parameters, if the current temperature exceeds the high-temperature threshold set by the temperature sensor, the temperature sensor output signal switches the MOSFET to power the EEPROM storing low-power operating parameters. The camera module 300 then retrieves the low-power operating parameters from the EEPROM and starts image processing. If the current temperature does not exceed the high-temperature threshold set by the temperature sensor, the camera module 300 maintains its current operating state.

[0066] When the camera module 300 operates with low-power parameters, if the current temperature is lower than the low-temperature threshold set by the temperature sensor, the temperature sensor output signal switches the MOSFET to power the EEPROM storing high-power operating parameters. The camera module 300 then retrieves the high-power operating parameters from the EEPROM and starts image processing. If the current temperature is not lower than the low-temperature threshold set by the temperature sensor, the camera module 300 maintains its current operating state.

[0067] Figure 3 The control circuit of the camera module 300 shown determines whether the current temperature exceeds the high-temperature threshold set by the temperature sensor when the camera module 300 starts up. If the current temperature exceeds the high-temperature threshold set by the temperature sensor, the temperature sensor output signal switches the CS pin of the camera module 300 to the Flash memory storing low-power operating parameters via a MOSFET. The camera module 300 then retrieves the low-power operating parameters from the Flash memory and starts the image processing. If the current temperature does not exceed the high-temperature threshold set by the temperature sensor, the temperature sensor output signal switches the CS pin of the camera module 300 to the Flash memory storing high-power operating parameters via a MOSFET. The camera module 300 then retrieves the high-power operating parameters from the Flash memory and starts the image processing.

[0068] When the camera module 300 operates with high power consumption parameters, if the current temperature exceeds the high-temperature threshold set by the temperature sensor, the temperature sensor output signal switches the CS pin of the camera module 300 to the Flash memory storing low-power operating parameters via a MOSFET. The camera module 300 then retrieves the low-power operating parameters from this Flash memory and starts recording. If the current temperature does not exceed the high-temperature threshold set by the temperature sensor, the camera module 300 maintains its current operating state.

[0069] When the camera module 300 operates with low-power parameters, if the current temperature is lower than the low-temperature threshold set by the temperature sensor, the temperature sensor output signal switches the CS pin of the camera module 300 to the Flash memory storing high-power operating parameters via a MOSFET. The camera module 300 then retrieves the high-power operating parameters from this Flash memory and starts recording. If the current temperature is not lower than the low-temperature threshold set by the temperature sensor, the camera module 300 maintains its current operating state.

[0070] This application embodiment determines whether to switch the operating parameters of the camera module by judging the temperature, so as to use low-power operating parameters to reduce heat generation at high temperatures and high-power operating parameters to improve the image quality of the camera module at low temperatures. If the camera module control circuit is applied to the vehicle end, it can effectively improve the robustness of the vehicle camera module under high temperature conditions and reduce the probability of malfunctions caused by high temperature.

[0071] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A camera module control circuit, characterized in that, The camera module control circuit includes: a temperature detection element, a reset circuit, a camera module, and a memory selection circuit; The temperature detection element is connected to the reset circuit and the memory gating circuit respectively, and is used to detect the temperature of the camera module and generate a temperature signal, and transmit the temperature signal to the reset circuit and the memory gating circuit respectively. The memory selection circuit includes multiple storage elements and is connected to the data terminal of the camera module. It is used to select the target storage element and the camera module according to the temperature signal. Each storage element stores a set of operating parameters of the camera module. Different operating parameters correspond to different power consumption of the camera module. The reset circuit is connected to the reset terminal of the camera module and is used to generate a reset signal based on the temperature signal and transmit the reset signal to the camera module. The camera module is used to restart according to the reset signal, and after restarting, it operates based on the operating parameters corresponding to the target storage element.

2. The camera module control circuit according to claim 1, characterized in that, The initial temperature signal output by the temperature detection element is at the first level; When the temperature signal is at the first level, if the current temperature is greater than the first temperature threshold, the temperature signal output by the temperature detection element is changed to the second level. When the temperature signal is at the second level, if the current temperature is less than the second temperature threshold, the temperature signal output by the temperature detection element is changed to the first level. The first temperature threshold is greater than the second temperature threshold.

3. The camera module control circuit according to claim 2, characterized in that, The memory gating circuit includes: a first memory circuit and a second memory circuit; The power supply terminal of the first memory circuit is connected to an external power source, the data terminal of the first memory circuit is connected to the data terminal of the camera module, and the control terminal of the first memory circuit is connected to the temperature detection element; when the temperature signal is at the first level, the first memory circuit and the camera module are switched on. The power supply terminal of the second memory circuit is connected to an external power source, the data terminal of the second memory circuit is connected to the data terminal of the camera module, and the control terminal of the second memory circuit is connected to the temperature detection element; when the temperature signal is at the second level, the second memory circuit is switched to the camera module.

4. The camera module control circuit according to claim 3, characterized in that, The first memory circuit includes: a first switching element and a first memory; The first terminal of the first switching element is connected to an external power supply, the second terminal of the first switching element is connected to one end of the first memory, and the control terminal of the first switching element is connected to the temperature detection element; when the temperature signal is the first level, the first switching element is in the on state. The other end of the first memory is connected to the data terminal of the camera module.

5. The camera module control circuit according to claim 4, characterized in that, The second memory circuit includes: a second switching element and a second memory; The first end of the second switching element is connected to an external power supply, the second end of the second switching element is connected to one end of the second memory, and the control end of the second switching element is connected to the temperature detection element; when the temperature signal is at the second level, the second switching element is in the on state; The other end of the second memory is connected to the data terminal of the camera module.

6. The camera module control circuit according to claim 2, characterized in that, The memory gating circuit includes: a third memory circuit and a fourth memory circuit; The data terminal of the third memory circuit is connected to the data terminal of the camera module, and the control terminal of the third memory circuit is connected to the temperature detection element; when the temperature signal is at the first level, the third memory circuit is switched on to the camera module. The data terminal of the fourth memory circuit is connected to the data terminal of the camera module, and the control terminal of the fourth memory circuit is connected to the temperature detection element; when the temperature signal is at the second level, the fourth memory circuit is switched to the camera module.

7. The camera module control circuit according to claim 6, characterized in that, The third memory circuit includes: a third switching element and a third memory; The first end of the third switching element is connected to the data terminal of the camera module, the second end of the third switching element is connected to the data terminal of the third memory, and the control terminal of the third switching element is connected to the temperature detection element; when the temperature signal is the first level, the third switching element is in the on state.

8. The camera module control circuit according to claim 7, characterized in that, The fourth memory circuit includes: a fourth switching element and a fourth memory; The first end of the fourth switching element is connected to the data terminal of the camera module, the second end of the fourth switching element is connected to the data terminal of the fourth memory, and the control terminal of the fourth switching element is connected to the temperature detection element; when the temperature signal is at the second level, the fourth switching element is in the on state.

9. The camera module control circuit according to claim 2, characterized in that, The reset circuit includes: a rising edge detection circuit and a falling edge detection circuit; One end of the rising edge detection circuit is connected to the temperature detection element, and the other end is connected to the reset terminal of the camera module; it is used to generate a reset signal based on the rising edge in the temperature signal and transmit the reset signal to the camera module. One end of the falling edge detection circuit is connected to the temperature detection element, and the other end is connected to the reset terminal of the camera module; it is used to generate a reset signal based on the falling edge in the temperature signal and transmit the reset signal to the camera module.

10. The camera module control circuit according to claim 9, characterized in that, The rising edge detection circuit includes: a first resistor, a second resistor, a first capacitor, a first Schmitt trigger, and a NOT gate; One end of the first resistor is connected to the temperature sensing element, and the other end of the first resistor is connected to the reset terminal of the camera module in sequence through a first capacitor, a first Schmitt trigger, and a NOT gate; one end of the second resistor is connected to the connection point of the first capacitor and the first Schmitt trigger, and the other end of the second resistor is connected to an external power supply. The falling edge detection circuit includes: a third resistor, a fourth resistor, a second capacitor, and a second Schmitt trigger; One end of the third resistor is connected to the temperature detection element, and the other end of the third resistor is connected to the reset terminal of the camera module in sequence through the second capacitor and the second Schmitt trigger; one end of the fourth resistor is connected to the connection point of the second capacitor and the second Schmitt trigger, and the other end of the fourth resistor is grounded.

Images