Vehicle-mounted camera power supply circuit and vehicle-mounted camera

Abstract

The utility model provides a vehicle-mounted camera power supply circuit. The vehicle-mounted camera power supply circuit comprises an image signal processing chip, an image sensor chip, a camera module and a power supply module. The power supply module provides stable electric energy for the image signal processing chip and the image sensor chip. The image signal processing chip and the image sensor chip are connected through an I2C data end and an I2C clock end, so that efficient and accurate data transmission is achieved, and integrity and accuracy of data transmission are ensured. Meanwhile, the image signal processing chip is responsible for controlling the camera module and receiving image data from the image sensor chip. Therefore, the circuit size is reduced, the space utilization rate is improved, the image capturing capability of the vehicle-mounted camera is enhanced, and a user can check more accurate image information in real time.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle-mounted cameras, and in particular to a vehicle-mounted camera power supply circuit and a vehicle-mounted camera. Background Art

[0002] Traditional automotive camera systems often utilize a decentralized power circuit layout, with independent signal processing chips, sensors, and camera modules. This results in bulky circuits and limits space utilization within the vehicle. Furthermore, the lack of tight integration between components leads to inefficient signal processing, which in turn impacts the camera's image capture capabilities, making it difficult for users to obtain accurate, clear, and realistic real-time image information.

[0003] In existing technologies, communication between image signal processing chips and image sensor chips often relies on complex wiring. This not only reduces data transmission efficiency but also increases the risk of data errors due to the lack of precise synchronization mechanisms to ensure the integrity and accuracy of data transmission. Users may experience delays, blurring, or distortion when viewing images provided by in-vehicle cameras, seriously affecting the driving experience and safety. Utility Model Content

[0004] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a highly efficient integrated vehicle-mounted camera power supply circuit.

[0005] The purpose of this disclosure is achieved through the following technical solutions:

[0006] A vehicle-mounted camera power supply circuit comprises an image signal processing chip, an image sensor chip, a camera module, a voltage stabilizing module and a power supply module.

[0007] The I2C data receiving end of the image signal processing chip is connected to the I2C data transmission end of the image sensor chip, the I2C clock receiving end of the image signal processing chip is connected to the I2C clock transmission end of the image sensor chip, the camera switch control end of the image signal processing chip is connected to the signal input end of the camera module, and the sensor data receiving end of the image signal processing chip is connected to the sensor data transmission end of the image sensor chip.

[0008] The voltage stabilization module includes a step-down voltage regulator and a second filter capacitor, wherein a first end of the second filter capacitor is connected to the output end of the power supply module, a second end of the second filter capacitor is grounded, an input end of the step-down voltage regulator is connected to the output end of the power supply module, and an output end of the step-down voltage regulator is connected to the digital power input end of the image sensor chip.

[0009] The power supply module includes a DC step-down chip and a first filter capacitor. The input end of the DC step-down chip is used to connect to the external power supply end, the output end of the DC step-down chip is connected to the input end of the step-down voltage regulator, the first end of the first filter capacitor is connected to the input end of the DC step-down chip, the second end of the first filter capacitor is grounded, and the output end of the DC step-down chip is also connected to the power supply end of the image signal processing chip.

[0010] In one embodiment, the vehicle-mounted camera power supply circuit further includes a first current limiting resistor, wherein a first end of the first current limiting resistor is connected to a power supply end of the power supply module, and a second end of the first current limiting resistor is connected to a low-level reset end of the image signal processing chip.

[0011] In one embodiment, the vehicle-mounted camera power supply circuit further includes a second current limiting resistor, wherein a first end of the second current limiting resistor is connected to an I2C clock receiving end of the image signal processing chip, and a second end of the second current limiting resistor is connected to an I2C clock transmission end of the image sensor chip.

[0012] In one embodiment, the vehicle-mounted camera power supply circuit further includes a third current limiting resistor, a first end of the third current limiting resistor is connected to the I2C data receiving end of the image signal processing chip, and a second end of the third current limiting resistor is connected to the I2C data transmission end of the image sensor chip.

[0013] In one embodiment, the vehicle-mounted camera power supply circuit further includes a third filter capacitor, a first end of the third filter capacitor is connected to the digital power input end of the image sensor chip, and a second end of the third filter capacitor is grounded.

[0014] In one embodiment, the power supply module also includes a fourth current limiting resistor and a fourth filter capacitor, the first end of the fourth current limiting resistor and the first end of the fourth filter capacitor are respectively connected to the output end of the DC step-down chip, and the second end of the fourth current limiting resistor and the second end of the fourth filter capacitor are both connected to the ground end.

[0015] In one embodiment, the power supply module further includes a filter inductor, a first end of the filter inductor is connected to the output end of the DC buck chip, and a second end of the filter inductor is connected to the input end of the buck voltage regulator.

[0016] In one embodiment, the image signal processing chip is of model XS5018A.

[0017] In one embodiment, the image sensor chip is model GC2083.

[0018] A vehicle-mounted camera comprises any one of the above-mentioned vehicle-mounted camera power supply circuits.

[0019] Compared with the prior art, the present disclosure has at least the following advantages:

[0020] 1. The aforementioned automotive camera power circuit achieves a high degree of integration by integrating an image signal processing chip, an image sensor chip, and a camera module, helping to reduce circuit size and improve space utilization. Furthermore, a bidirectional communication connection is established between the image signal processing chip and the image sensor chip via an I2C data transmission port and an I2C clock transmission port, reducing the number of pins on the circuit board, enabling timely and efficient data transmission, and reducing the production cost of the automotive camera power circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a circuit diagram of a vehicle-mounted camera power supply circuit according to one embodiment;

[0023] Figure 2 for Figure 1 Another circuit diagram of the vehicle camera power supply circuit shown;

[0024] Figure 3 for Figure 1 Another circuit diagram of the vehicle camera power supply circuit shown. DETAILED DESCRIPTION

[0025] To facilitate understanding of the present disclosure, a more comprehensive description of the present disclosure will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present disclosure. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. The terms used herein in the specification of this disclosure are intended only to describe specific embodiments and are not intended to limit this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure is further described in detail below with reference to specific embodiments:

[0029] like Figures 1 to 3 As shown, the vehicle-mounted camera power supply circuit 10 according to an embodiment of the present disclosure includes an image signal processing chip U1, an image sensor chip U2, a camera module U3, a voltage stabilizing module and a power supply module.

[0030] The I2C data receiving terminal I2C_SDA of the image signal processing chip U1 is connected to the I2C data transmission terminal I2C_SENSOR_SDA of the image sensor chip U2, the I2C clock receiving terminal I2C_SCL of the image signal processing chip U1 is connected to the I2C clock transmission terminal I2C_SENSOR_SCL of the image sensor chip U2, the camera switch control terminal LINE_CTL of the image signal processing chip U1 is connected to the signal input terminal LENS of the camera module U3, and the sensor data receiving terminal SENSOR_DAT0 of the image signal processing chip U1 is connected to the sensor data transmission terminal D0 of the image sensor chip U2.

[0031] The voltage stabilization module includes a step-down voltage regulator U5 and a second filter capacitor C21. The first end of the second filter capacitor C21 is connected to the output end of the power supply module, and the second end of the second filter capacitor C21 is grounded. The input end of the step-down voltage regulator U5 is connected to the output end of the power supply module, and the output end of the step-down voltage regulator U5 is connected to the digital power input end DOVDD of the image sensor chip U2.

[0032] The power supply module includes a DC step-down chip U4 and a first filter capacitor C35. The input end of the DC step-down chip U4 is used to connect to the external power supply end, the output end of the DC step-down chip U4 is connected to the input end of the step-down voltage regulator U5, the first end of the first filter capacitor C35 is connected to the input end of the DC step-down chip U4, the second end of the first filter capacitor C35 is grounded, and the output end of the DC step-down chip U4 is also connected to the power supply end OSC_DVDD33 of the image signal processing chip U1.

[0033] In this embodiment, when the vehicle-mounted camera power supply circuit 10 is activated, the power supply module converts the vehicle power supply into the operating voltage required by the image signal processing chip U1 and the image sensor chip U2, ensuring that the image signal processing chip U1 and the image sensor chip U2 can start and operate normally. The image sensor chip U2 uses the photoelectric effect to convert the light signal captured by the camera module U3 into a digital image signal. At the same time, the image sensor chip U2 establishes a bidirectional communication connection with the image signal processing chip U1 through its I2C data transmission terminal and I2C clock transmission terminal to control the data acquisition operation of the image sensor chip U2. The image signal processing chip U1 also receives image data output by the sensor data transmission terminal D0 of the image sensor chip U2 through its sensor data receiving terminal SENSOR_DAT0. The image signal processing chip U1 then further processes the image data to optimize image quality. Finally, the image signal processing chip U1 outputs the processed image signal to a display device, allowing the user to view the captured image in real time.

[0034] Furthermore, when the external power supply voltage fluctuates, the step-down voltage regulator U5 can automatically adjust its output voltage to offset the change in input voltage, thereby providing a stable power supply environment for the image sensor chip U2. At the same time, the DC step-down chip U4 can ensure that the voltage output to the image signal processing chip U1 remains stable by adjusting the duty cycle of its internal switch, thereby providing a stable power supply environment for the vehicle-mounted camera power supply circuit 10.

[0035] The aforementioned vehicle-mounted camera power supply circuit 10 achieves high integration by integrating the image signal processing chip U1, the image sensor chip U2, and the camera module U3. This helps reduce circuit size and improve space utilization. Furthermore, a bidirectional communication connection is established between the image signal processing chip U1 and the image sensor chip U2 via an I2C data transmission port and an I2C clock transmission port. This reduces the number of pins on the circuit board, enables timely and efficient data transmission, and reduces the production cost of the vehicle-mounted camera power supply circuit 10.

[0036] like Figure 1As shown, in one embodiment, the vehicle-mounted camera power supply circuit 10 further includes a first current-limiting resistor R1. The first end of the first current-limiting resistor R1 is connected to the power supply end of the power supply module, and the second end of the first current-limiting resistor R1 is connected to the low-level reset end EXT_RST_N of the image signal processing chip U1. In this embodiment, when the vehicle-mounted camera power supply circuit 10 is started, the electric energy output by the power supply module passes through the first current-limiting resistor R1 and is then connected to the low-level reset end EXT_RST_N of the image signal processing chip U1. Because the power supply module may generate a large instantaneous current during initial startup, the first current-limiting resistor R1 can limit the current and prevent the current from directly impacting the image signal processing chip U1, thereby protecting the image signal processing chip U1 from damage caused by excessive current. Therefore, the first current-limiting resistor R1 can ensure that the reset signal is more stable and reliable, thereby avoiding false resets caused by transient changes in the power supply and improving the stability of the vehicle-mounted camera power supply circuit 10.

[0037] like Figure 1 and Figure 2 As shown, in one embodiment, the vehicle camera power supply circuit 10 further includes a second current-limiting resistor R2. The first end of the second current-limiting resistor R2 is connected to the I2C clock receiving terminal I2C_SCL of the image signal processing chip U1, and the second end of the second current-limiting resistor R2 is connected to the I2C clock transmission terminal I2C_SENSOR_SCL of the image sensor chip U2. In this embodiment, when the image sensor chip U2 transmits a clock signal to the I2C clock receiving terminal I2C_SCL of the image signal processing chip U1 via its I2C clock transmission terminal, the second current-limiting resistor R2 can limit the current flowing through the I2C clock line to prevent damage to the I2C interface of the image signal processing chip U1 or the image sensor chip U2 due to excessive current. This ensures that the clock signal can be efficiently and accurately transmitted from the image sensor chip U2 to the image signal processing chip U1, thereby improving the stability of the vehicle camera power supply circuit 10.

[0038] like Figure 1 and Figure 2As shown, in one embodiment, the vehicle camera power supply circuit 10 further includes a third current-limiting resistor R3. The first end of the third current-limiting resistor R3 is connected to the I2C data receiving terminal I2C_SDA of the image signal processing chip U1, and the second end of the third current-limiting resistor R3 is connected to the I2C data transmission terminal I2C_SENSOR_SDA of the image sensor chip U2. In this embodiment, during I2C data communication, the image sensor chip U2 transmits digital signals including image data, status information, etc. to the I2C data receiving terminal I2C_SDA of the image signal processing chip U1 via its I2C data transmission terminal. Because the third current-limiting resistor R3 is connected in series with the data communication path, when the image sensor chip U2 sends data to the image signal processing chip U1, the third current-limiting resistor R3 can limit the current flowing through the I2C data line. This effectively prevents excessive current from damaging the chip's I2C interface, thereby protecting circuit components from overcurrent shocks and improving the reliability of the vehicle camera power supply circuit 10.

[0039] like Figure 2 As shown, in one embodiment, the vehicle-mounted camera power supply circuit 10 also includes a third filter capacitor C29, the first end of the third filter capacitor C29 is connected to the digital power input terminal DOVDD of the image sensor chip U2, and the second end of the third filter capacitor C29 is grounded. In this embodiment, when the voltage output by the power supply module fluctuates, the third filter capacitor C29 has an energy storage characteristic to absorb or release electrical energy, thereby smoothing the voltage fluctuation. Specifically, when the voltage increases, the capacitor absorbs excess electrical energy and stores it as electric field energy; and when the voltage decreases, the capacitor releases the stored electrical energy to supplement the voltage deficiency. Thus, through the charging and discharging process of the capacitor, high-frequency noise and voltage fluctuations in the power supply can be effectively filtered out, thereby providing a more stable voltage for the image sensor chip U2.

[0040] like Figure 1As shown, in one embodiment, the power supply module also includes a fourth current-limiting resistor R11 and a fourth filter capacitor C2. The first end of the fourth current-limiting resistor R11 and the first end of the fourth filter capacitor C2 are respectively connected to the output end of the DC step-down chip U4, and the second end of the fourth current-limiting resistor R11 and the second end of the fourth filter capacitor C2 are both connected to the ground end. In this embodiment, when the power circuit is started or a short circuit occurs, the fourth current-limiting resistor R11 acts as a current limiting element, which can effectively limit the current at the output end of the DC step-down chip U4, preventing excessive current from directly impacting the image signal processing chip U1, thereby protecting the image signal processing chip U1 from damage. The fourth filter capacitor C2 can absorb and release electrical energy. For high-frequency noise and small voltage fluctuations, the capacitor's charging and discharging process can smooth them out, reducing the ripple of the output voltage, thereby providing a stable power supply voltage for the circuit.

[0041] like Figure 3 As shown, in one embodiment, the power supply module also includes a filter inductor L1, the first end of the filter inductor L1 is connected to the output end of the DC buck chip U4, and the second end of the filter inductor L1 is connected to the input end of the buck voltage regulator U5. In this embodiment, the filter inductor L1 is connected between the output end of the DC buck chip U4 and the input end of the buck voltage regulator U5. Since the filter inductor L1 stores electrical energy in the form of a magnetic field. When the circuit needs to stabilize the current or respond to load changes, the inductor will release the stored electrical energy to supplement the power supply shortage, and its energy storage and release process helps to smooth the output voltage and reduce fluctuations. During the DC buck process, due to the rapid switching of the switching circuit, high-frequency noise and ripple are easily generated. At this time, since the filter inductor L1 has a high impedance to high-frequency signals, it can effectively suppress high-frequency noise, thereby reducing the noise of the output voltage of the DC buck module.

[0042] like Figure 1 As shown, in one embodiment, the image signal processing chip U1 is model XS5018A. In this embodiment, when the vehicle-mounted camera power supply circuit 10 is activated and the power supply module provides a stable operating voltage to the XS5018A chip, the image signal processing chip U1XS5018A establishes an I2C communication connection with the image sensor chip U2 and reads the raw image data captured by the image sensor chip U2 via the I2C interface. Simultaneously, the image signal processing chip U1XS5018A continuously receives raw image data from the image sensor chip U2 in the form of digital signals and connects to the camera module U3 via its camera switch control terminal, enabling the image signal processing chip U1XS5018A to adjust the camera's operating status in real time, thereby enabling the image signal processing chip U1XS5018A to serve as a communication bridge between the image sensor chip U2 and the camera module U3.

[0043] like Figure 1 As shown, in one embodiment, the image sensor chip U2 is model GC2083. In this embodiment, after the vehicle camera power supply circuit 10 is activated, the power supply module provides a stable operating voltage to the GC2083 chip. The image sensor chip U2GC2083 captures light focused from the lens through its highly sensitive photodiode array. This light is converted into raw image data in the form of electrical signals through the photoelectric effect. This image data is then transmitted to the image signal processing chip U1XS5018A. Through the close cooperation between the image sensor chip U2GC2083 and the image signal processing chip U1XS5018A, the vehicle camera power supply circuit 10 is able to achieve high-quality image capture and processing. This improves the image capture capability of the vehicle camera power supply circuit 10, providing the driver with clearer and more reliable visual assistance information.

[0044] A vehicle-mounted camera includes any of the above-described vehicle-mounted camera power supply circuits. In this embodiment, when the vehicle-mounted camera power supply circuit 10 is activated, the power supply module converts the vehicle power supply into the operating voltage required by the image signal processing chip U1 and the image sensor chip U2, ensuring that the image signal processing chip U1 and the image sensor chip U2 can start and operate normally. The image sensor chip U2 utilizes the photoelectric effect to convert the light signal captured by the camera module U3 into a digital image signal. Simultaneously, the image sensor chip U2 establishes a bidirectional communication connection with the image signal processing chip U1 via its I2C data transmission port and I2C clock transmission port to control the data acquisition operation of the image sensor chip U2. The image signal processing chip U1 also receives image data output by the sensor data transmission port D0 of the image sensor chip U2 via its sensor data receiving port SENSOR_DAT0. The image signal processing chip U1 then further processes the image data to optimize image quality. Finally, the image signal processing chip U1 outputs the processed image signal to a display device, allowing the user to view the captured image in real time. Furthermore, because the vehicle power supply voltage may fluctuate within a certain range, the step-down voltage regulator U5 automatically adjusts its output voltage to offset input voltage variations, thereby providing a stable power supply environment for the image sensor chip U2. When the external power supply voltage fluctuates, the DC step-down chip U4 adjusts the duty cycle of its internal switch to ensure a stable output voltage, thereby providing a stable power supply environment for the vehicle camera power supply circuit 10.

[0045] Compared with the prior art, the present disclosure has at least the following advantages:

[0046] 1. The aforementioned vehicle-mounted camera power supply circuit 10 achieves high integration by integrating the image signal processing chip U1, the image sensor chip U2, and the camera module U3. This helps reduce circuit size and improve space utilization. Furthermore, a bidirectional communication connection is established between the image signal processing chip U1 and the image sensor chip U2 via an I2C data transmission port and an I2C clock transmission port. This reduces the number of pins on the circuit board, enables timely and efficient data transmission, and reduces the production cost of the vehicle-mounted camera power supply circuit 10.

[0047] The above-described embodiments merely represent several implementation methods of the present disclosure. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the disclosed patent shall be determined by the appended claims.

Claims

1. A vehicle-mounted camera power supply circuit, characterized in that: Including image signal processing chip, image sensor chip, camera module, voltage regulator module and power supply module, The I2C data receiving end of the image signal processing chip is connected to the I2C data transmission end of the image sensor chip, the I2C clock receiving end of the image signal processing chip is connected to the I2C clock transmission end of the image sensor chip, the camera switch control end of the image signal processing chip is connected to the signal input end of the camera module, and the sensor data receiving end of the image signal processing chip is connected to the sensor data transmission end of the image sensor chip; The voltage stabilization module includes a step-down voltage regulator and a second filter capacitor, wherein a first end of the second filter capacitor is connected to the output end of the power supply module, a second end of the second filter capacitor is grounded, an input end of the step-down voltage regulator is connected to the output end of the power supply module, and an output end of the step-down voltage regulator is connected to the digital power input end of the image sensor chip; The power supply module includes a DC step-down chip and a first filter capacitor. The input end of the DC step-down chip is used to connect to the external power supply end, the output end of the DC step-down chip is connected to the input end of the step-down voltage regulator, the first end of the first filter capacitor is connected to the input end of the DC step-down chip, the second end of the first filter capacitor is grounded, and the output end of the DC step-down chip is also connected to the power supply end of the image signal processing chip.

2. The vehicle-mounted camera power supply circuit according to claim 1, characterized in that: The vehicle-mounted camera power supply circuit also includes a first current limiting resistor, a first end of the first current limiting resistor is connected to the power supply end of the power supply module, and a second end of the first current limiting resistor is connected to the low-level reset end of the image signal processing chip.

3. The vehicle-mounted camera power supply circuit according to claim 2, characterized in that: The vehicle-mounted camera power supply circuit also includes a second current limiting resistor, a first end of the second current limiting resistor is connected to the I2C clock receiving end of the image signal processing chip, and a second end of the second current limiting resistor is connected to the I2C clock transmission end of the image sensor chip.

4. The vehicle-mounted camera power supply circuit according to claim 2, characterized in that: The vehicle-mounted camera power supply circuit also includes a third current limiting resistor, a first end of the third current limiting resistor is connected to the I2C data receiving end of the image signal processing chip, and a second end of the third current limiting resistor is connected to the I2C data transmission end of the image sensor chip.

5. The vehicle-mounted camera power supply circuit according to claim 1, characterized in that: The vehicle-mounted camera power supply circuit further includes a third filter capacitor, a first end of the third filter capacitor is connected to the digital power input end of the image sensor chip, and a second end of the third filter capacitor is grounded.

6. The vehicle-mounted camera power supply circuit according to claim 1, characterized in that: The power supply module also includes a fourth current limiting resistor and a fourth filter capacitor, the first end of the fourth current limiting resistor and the first end of the fourth filter capacitor are respectively connected to the output end of the DC step-down chip, and the second end of the fourth current limiting resistor and the second end of the fourth filter capacitor are both connected to the ground end.

7. The vehicle-mounted camera power supply circuit according to claim 6, characterized in that: The power supply module further includes a filter inductor, a first end of the filter inductor being connected to the output end of the DC buck chip, and a second end of the filter inductor being connected to the input end of the buck voltage regulator.

8. The vehicle-mounted camera power supply circuit according to claim 1, characterized in that: The model of the image signal processing chip is XS5018A.

9. The vehicle-mounted camera power supply circuit according to claim 1, characterized in that: The model of the image sensor chip is GC2083.

10. A vehicle-mounted camera, characterized in that: The vehicle-mounted camera power supply circuit includes any one of claims 1 to 9.

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