A load monitoring and diagnostic circuit for a camera

Abstract

The present invention provides a load monitoring and diagnostic circuit for a camera, including a VCC1 power supply, a camera device, a microcontroller, a VCC2 excitation source, a resistor R1, a resistor R2, a resistor R3, and a diode D1. The VCC1 power supply is electrically connected to the positive pole of the power supply terminal of the camera device through the diode D1, and the negative pole of the power supply section of the camera device is grounded. The power supply terminal of the camera device is grounded after being connected in parallel with the resistor R2 and the resistor R3. One end of the resistor R3 far from the ground is connected in parallel with a first microcontroller for monitoring its voltage, and the grounding terminal of the first microcontroller is grounded. The VCC2 excitation source is electrically connected to the power supply terminal of the camera device through the resistor R1. The voltage of the resistor R3 shows different values in the load-to-ground short-circuit fault state, the load-to-power supply fault state, the load open-circuit fault state, and the load normal state, facilitating real-time detection and monitoring.

Description

Technical Field

[0001] The present invention relates to the field of monitoring and diagnosis, and particularly to a load monitoring and diagnosis circuit for a camera. Background Art

[0002] With the rapid development of automotive intelligence, in-vehicle cameras are increasingly widely used in the automotive field. From early applications for driving record, rearview image, and 360-degree surround view, they have gradually extended to behavior recognition in the intelligent cockpit and ADAS intelligent driving, with the application scenarios becoming increasingly rich. According to the different requirements of intelligent driving functions and the installation positions of cameras, in-vehicle cameras are divided into front-view, rear-view, surround-view, side-view, and in-vehicle cameras, etc.

[0003] As a main component of the intelligent driving domain controller, the load diagnosis and detection of in-vehicle cameras are extremely crucial and important.

[0004] Currently, the diagnosis and detection of camera loads are basically achieved by a microcontroller collecting the power supply voltage of the camera, and then judging various states of the camera load by processing and analyzing the collected voltage values, including low short-circuit faults, power short-circuit faults, and normal states. Since the voltage values collected in the open-circuit state and the normal connection state of the camera load are the same, the microcontroller cannot detect and judge the open-circuit state of the load. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects existing in the prior art, and the present invention proposes a load monitoring and diagnosis circuit for a camera.

[0006] To solve the above technical problem, the technical solution adopted by the present invention is a load monitoring and diagnosis circuit for a camera, including:

[0007] A detection circuit, and the camera device judges the type of fault of the camera device through the voltage value detected by the detection circuit;

[0008] A VCC2 excitation source, which is electrically connected to the positive pole of the power supply of the camera device. The VCC2 excitation source is used to energize the detection circuit when the camera device is open-circuited, and judge the real-time connection state of the camera device according to the voltage value detected by the detection circuit.

[0009] Further, the VCC2 excitation source is preset with a rated voltage U2 and low power, which is used to make the VCC2 excitation source output a low current. The power supply VCC1 of the imaging device outputs a rated voltage U1. The value of the rated voltage U2 is greater than the rated voltage U1. When the imaging device is not open-circuited, the high-voltage VCC2 excitation source is clamped by the output low current, and the low-voltage power supply VCC1 supplies power to the detection circuit. When the imaging device is open-circuited, the clamping is released, and the VCC2 excitation source supplies power to the detection circuit, enabling the microcontroller to detect the real-time connection state of the imaging device.

[0010] A reverse current prevention unit is arranged on the detection circuit to prevent the high voltage of the VCC2 excitation source from flowing back into the power supply VCC1 of the imaging device.

[0011] Further, the reverse current prevention unit is a diode D1. The power supply VCC1 of the imaging device is connected to the positive pole of the power supply port of the imaging device through the diode D1.

[0012] Further, a shunt resistor R1 for shunting is arranged on the VCC2 excitation source. The VCC2 excitation source is electrically connected to the positive pole of the power supply port of the imaging device through the shunt resistor R1.

[0013] Further, the detection circuit includes a voltage-dividing resistor R2, a monitoring resistor R3, and a first microcontroller. The VCC1 power supply is electrically connected to the positive pole of the power supply port of the imaging device. The negative pole of the power supply port of the imaging device is grounded. The positive pole of the power supply port of the imaging device is grounded in parallel with the voltage-dividing resistor R2 and the monitoring resistor R3. The voltage-dividing resistor R2 includes at least one sub-resistor. The input end of the monitoring resistor R3 is connected in parallel with the first microcontroller for the first microcontroller to detect the voltage value of the monitoring resistor R3 and judge the type of fault of the imaging device. The grounding end of the first microcontroller is grounded.

[0014] Further, multiple thresholds are preset in the first microcontroller. The multiple thresholds are compared with the voltage value of the monitoring resistor R3 to judge the real-time connection state of the imaging device. The connection state includes a load-to-ground short circuit fault, a load-to-power supply fault, a load open-circuit fault, and a load normal state.

[0015] Further, the multiple thresholds include 0V, >(U1 - U3) / (R2 + R3) * R3, U2 / (R1 + R2 + R3) * R3, (U1 - U3) / (R2 + R3) * R3, where the connection state corresponding to 0V is the load-to-ground short-circuit fault state, the connection state corresponding to >(U1 - U3) / (R2 + R3) * R3 is the load-to-power supply fault state, the connection state corresponding to U2 / (R1 + R2 + R3) * R3 is the load open-circuit fault state, and the connection state corresponding to (U1 - U3) / (R2 + R3) * R3 is the load normal state; where U1 is the voltage value of the rated voltage U1 of the VCC1 power supply, U2 is the voltage value of the rated voltage U2 of the VCC2 excitation source, U3 is the voltage division value of the diode D1, R1 is the resistance value of the shunt resistor R1, R2 is the resistance value of the voltage division resistor R2, and R3 is the resistance value of the monitoring resistor R3.

[0016] Further, a display screen is provided on the first microcontroller for displaying the voltage value of the monitoring resistor R3.

[0017] Further, a remote monitoring device is further included. The remote monitoring device is electrically connected to the first microcontroller for monitoring the real-time connection state of the camera device. An alarm device is provided on the remote monitoring device for alarming when a load fails.

[0018] Further, a second microcontroller is further included. The power supply terminal of the camera device is connected in parallel to the second microcontroller for detecting the voltage value at this point. The ground terminal of the second microcontroller is grounded. A display screen is provided on the second microcontroller for displaying the voltage value of the power supply terminal of the camera device.

[0019] Compared with the prior art, the beneficial effects of the present invention include: enabling the voltage of the resistor R3 to show different values in the load-to-ground short-circuit fault state, the load-to-power supply fault state, the load open-circuit fault state, and the load normal state, so as to facilitate real-time monitoring of the connection state of the camera device. Compared with the traditional method where the open-circuit and normal states of the camera device are the same during normal operation, there is a significant improvement, providing an effective technical means for real-time monitoring of the connection state of electrical appliances. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The disclosure of the present invention will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the protection scope of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them:

[0021] Figure 1 Schematically shows the circuit working principle diagram proposed according to an embodiment of the present invention;

[0022] Figure 2 Schematically shows a schematic diagram of the system process structure proposed according to an embodiment of the present invention;

[0023] Figure 3 Schematically shows a schematic diagram of the process structure of remote monitoring proposed according to an embodiment of the present invention. Specific embodiments

[0024] It is easily understood that according to the technical solution of the present invention, without changing the essence of the present invention, those of ordinary skill in the art can propose various interchangeable structural ways and implementation ways. Therefore, the following specific embodiments and the accompanying drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as all of the present invention or as a limitation or restriction on the technical solution of the present invention.

[0025] Combined with an embodiment of the present invention Figure 1 Shown. A load monitoring and diagnostic circuit for a camera, comprising: a detection circuit, the VCC2 excitation source is electrically connected to the positive pole of the power supply of the imaging device, and the imaging device judges the type of fault of the imaging device according to the voltage value detected by the detection circuit;

[0026] The VCC2 excitation source is used to energize the detection circuit when the imaging device is open, and judge the real-time connection state of the imaging device according to the voltage value detected by the detection circuit. As the prior art shown in the background art, the detection circuit, the present invention is improved according to this prior art. When the load is open, the VCC2 excitation source is used to energize the detection circuit, so that the voltage values detected by the microcontroller for detection are different in four states: load short-circuit to ground fault, load to power supply fault, load open circuit fault, and load normal state, so as to judge the real-time connection state of the imaging device.

[0027] Specifically, as Figure 1 shown, the VCC2 excitation source presets a rated voltage U2 and low power, so as to make the VCC2 excitation source output a low current. The VCC1 power supply of the imaging device outputs a rated voltage U1. The value of the rated voltage U2 is greater than the rated voltage U1. The output low current makes the high-voltage VCC2 excitation source clamped when the imaging device is not open, and the low-voltage VCC1 power supply supplies power to the detection circuit; when the imaging device is open, the clamping is released, and the VCC2 excitation source supplies power to the detection circuit, so that the microcontroller detects the real-time connection state of the imaging device;

[0028] An anti-backflow unit is provided on the detection circuit to prevent the high voltage of the VCC2 excitation source from flowing back into the VCC1 power supply of the imaging device. When the load imaging device is not open-circuited, the low-current VCC2 excitation source is clamped, enabling the VCC1 power supply to supply power to the detection circuit normally. When the load imaging device is open-circuited, the clamping is released, and at this time, the VCC2 excitation source with a higher voltage supplies power to the detection circuit. With different power sources in different states, obviously the voltage values of the detection circuit are different, so that different connection states of the imaging device show different voltage values in the detection circuit, facilitating judgment and identification. The provided anti-backflow unit prevents the high-voltage VCC2 excitation source from flowing voltage into the low-voltage VCC1 power supply.

[0029] Specifically, as Figure 1 shown, the anti-backflow unit is a diode D1, and the VCC1 power supply of the imaging device is connected to the positive pole of the power supply port of the imaging device through the diode D1. The diode D1 provides the anti-backflow function.

[0030] Specifically, as Figure 1 shown, a shunt resistor R1 for shunting is provided on the VCC2 excitation source, and the VCC2 excitation source is electrically connected to the positive pole of the power supply port of the imaging device through the shunt resistor R1. A shunt resistor R1 for shunting is provided.

[0031] Specifically, as Figure 1 and Figure 2As shown in the figure, the detection circuit includes a voltage-dividing resistor R2, a monitoring resistor R3, and a first microcontroller. The VCC1 power supply is electrically connected to the positive pole of the power supply port of the imaging device, the negative pole of the power supply port of the imaging device is grounded, and the positive pole of the power supply port of the imaging device is grounded after being connected in parallel with the voltage-dividing resistor R2 and the monitoring resistor R3. The voltage-dividing resistor R2 includes at least one sub-resistor. The input end of the monitoring resistor R3 is connected in parallel with the first microcontroller for the first microcontroller to detect the voltage value of the monitoring resistor R3 and judge the type of fault of the imaging device. The grounding end of the first microcontroller is grounded. A specific implementation means is provided as follows: When the circuit load imaging device is normal, due to its preset low power and rated voltage U1, the VCC2 excitation source outputs a very small current, resulting in the voltage being clamped, so that the VCC1 power supply with a voltage lower than its voltage value supplies power to the imaging device. The diode D1 is set to prevent the high voltage of the VCC2 excitation source from entering the VCC1 power supply. At this time, the VCC1 power supply divides the voltage between the resistor R2 and the resistor R3. The voltage of the resistor R3 is detected by the first microcontroller. At this time, the voltage of R3 is (U1 - U3) / (R2 + R3)*R3, where U3 is the voltage value divided by the diode D1. When the circuit load imaging device has a ground short circuit fault, the voltage of R3 is 0V at this time. When the circuit load imaging device has a load-to-power supply fault, it is possible that an external power supply is directly connected to the load, resulting in an increase in the voltage applied to the load. At this time, the voltage of R3 is greater than (U1 - U3) / (R2 + R3)*R3. When the circuit load imaging device has a load open circuit fault, the clamping is released at this time, and the VCC2 excitation source with a higher voltage supplies power to the circuit. The diode D1 set makes the VCC2 excitation source not flow back into the VCC1 power supply. At this time, the voltage of R3 is U2 / (R1 + R2 + R3)*R3. The voltages of the resistor R3 in each state are different, making it very easy to distinguish and monitor the connection state of the imaging device.

[0032] Specifically, as Figure 1 shown, a plurality of thresholds are preset in the first microcontroller, and the plurality of thresholds are compared with the voltage value of the monitoring resistor R3 to judge the real-time connection state of the imaging device. The connection state includes a load-to-ground short circuit fault, a load-to-power supply fault, a load open circuit fault, and a load normal state. The specific connection state of the load imaging device is determined by detecting the voltage value of the resistor R3 and judging it with the threshold.

[0033] Specifically, as shown in Figure 1, multiple thresholds include 0V, >(U1 - U3) / (R2 + R3) * R3, U2 / (R1 + R2 + R3) * R3, (U1 - U3) / (R2 + R3) * R3. Among them, the connection state corresponding to 0V is the load-to-ground short-circuit fault state, the connection state corresponding to >(U1 - U3) / (R2 + R3) * R3 is the load-to-power supply fault state, the connection state corresponding to U2 / (R1 + R2 + R3) * R3 is the load open-circuit fault state, and the connection state corresponding to (U1 - U3) / (R2 + R3) * R3 is the load normal state; where U1 is the voltage value of the rated voltage U1 of the VCC1 power supply, U2 is the voltage value of the rated voltage U2 of the VCC2 excitation source, U3 is the voltage division value of the diode D1, R1 is the resistance value of the shunt resistor R1, R2 is the resistance value of the voltage division resistor R2, and R3 is the resistance value of the monitoring resistor R3. Specific implementation means are provided.

[0034] Specifically, as Figure 1 shown, a display screen is provided on the first microcontroller for displaying the voltage value of the monitoring resistor R3. It is used to display the voltage value of the monitoring resistor R3, so that personnel can intuitively judge the connection state of the load.

[0035] Specifically, as Figure 1 shown, a remote monitoring device is further included. The remote monitoring device is electrically connected to the first microcontroller to monitor the real-time connection state of the camera device. An alarm device is provided on the remote monitoring device for alarming when a load fails. The remote monitoring device enables remote monitoring of the real-time connection state of the camera device through signal transmission, and the specific connection state of the current camera device can be directly displayed on an external display screen through the signal. It is intuitive and convenient, greatly facilitating the detection of personnel, and multiple camera devices can be integrally monitored at the terminal through various data analyses.

[0036] Specifically, as Figure 3 shown, a second microcontroller is further included. The power supply terminal of the camera device is connected in parallel with the second microcontroller to detect the voltage at this point. A display screen is provided on the second microcontroller for displaying the voltage value of the power supply terminal of the camera device. The second microcontroller detects the voltage of the power supply terminal of the camera device, and the above four states can also be distinguished from this voltage.

[0037] A specific implementation data is provided:

[0038] Let the voltage U2 of the VCC2 excitation source be 12V, the voltage U1 of the power supply VCC1 be 8V, R1 be 4.7K, R2 be 50K, R3 be 10K, and the voltage drop of the diode be 0.7V.

[0039]

[0040] In this embodiment, through the above-mentioned components and electrical installation relationships, the circuit is successfully installed. Then, the first microcontroller is used to detect the voltage of resistor R3. When the circuit load camera device is normal, due to its preset low power and rated voltage U1, the output current of the VCC2 excitation source is very small, resulting in the voltage being clamped, so that the VCC1 power supply with a voltage lower than its value supplies power to the camera device. The diode D1 is set to prevent the high voltage of the VCC2 excitation source from entering the VCC1 power supply. At this time, the VCC1 power supply divides the voltage between resistor R2 and resistor R3. By detecting the voltage of resistor R3 with the first microcontroller, the voltage of R3 at this time is (U1 - U3) / (R2 + R3) * R3, where U3 is the voltage value divided by the diode D1. When the circuit load camera device has a ground short circuit fault, the voltage of R3 at this time is 0V. When the circuit load camera device has a load-to-power supply fault, it is possible that an external power supply is directly connected to the load, resulting in an increase in the voltage applied to the load. At this time, the voltage of R3 is greater than (U1 - U3) / (R2 + R3) * R3. When the circuit load camera device has an open circuit fault, the clamping is released, and the VCC2 excitation source with a higher voltage supplies power to the circuit. The diode D1 set makes the VCC2 excitation source not flow back into the VCC1 power supply. At this time, the voltage of R3 is U2 / (R1 + R2 + R3) * R3. The voltages of resistor R3 in each state are different, making it very easy to distinguish and monitor the connection state of the camera device.

[0041] Moreover, the connection state of the camera device can be monitored through a remote monitoring device. When the connection state of the camera device is a fault state, the remote monitoring device makes the alarm device alarm through signal transmission.

[0042] Moreover, the remote monitoring device can also make the detected connection state more accurate by comparing or redundantly checking the data of the first microcontroller and the second microcontroller.

[0043] The technical scope of the present invention is not limited to the content described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A load monitoring and diagnostic circuit for a camera, characterized in that, it includes: a detection circuit, and the camera device judges the type of fault of the camera device according to the voltage value detected by the detection circuit; a VCC2 excitation source, the VCC2 excitation source is electrically connected to the positive pole of the power supply of the camera device, and the VCC2 excitation source is used to energize the detection circuit when the camera device is open-circuited, and judges the real-time connection state of the camera device according to the voltage value detected by the detection circuit; The VCC2 excitation source presets a rated voltage U2 and low power, so as to make the VCC2 excitation source output a low current. The VCC1 power supply of the camera device outputs a rated voltage U1. The value of the rated voltage U2 is greater than the rated voltage U1. When the camera device is not open-circuited, the high-voltage VCC2 excitation source is clamped, and the low-voltage VCC1 power supply supplies power to the detection circuit.

2. A load monitoring and diagnostic circuit for a camera according to claim 1, characterized in that: When the camera device is open-circuited, the clamping is released, and the VCC2 excitation source supplies power to the detection circuit, so that the microcontroller detects the real-time connection state of the camera device; An anti-backflow unit is arranged on the detection circuit to prevent the high voltage of the VCC2 excitation source from flowing back to the VCC1 power supply of the camera device.

3. A load monitoring and diagnostic circuit for a camera according to claim 2, characterized in that: The anti-backflow unit is a diode D1, and the VCC1 power supply of the camera device is connected to the positive pole of the power supply port of the camera device through the diode D1.

4. A load monitoring and diagnostic circuit for a camera according to claim 3, characterized in that: A shunt resistor R1 for shunting is arranged on the VCC2 excitation source, and the VCC2 excitation source is electrically connected to the positive pole of the power supply port of the camera device through the shunt resistor R1.

5. A load monitoring and diagnostic circuit for a camera according to claim 4, characterized in that: The detection circuit includes a voltage-dividing resistor R2, a monitoring resistor R3, and a first microcontroller. The VCC1 power supply is electrically connected to the positive pole of the power supply port of the camera device. The negative pole of the power supply port of the camera device is grounded. The positive pole of the power supply port of the camera device is grounded in parallel with the voltage-dividing resistor R2 and the monitoring resistor R3. The voltage-dividing resistor R2 includes at least one sub-resistor. The input end of the monitoring resistor R3 is connected in parallel with the first microcontroller for the first microcontroller to detect the voltage value of the monitoring resistor R3 and judge the type of fault of the camera device. The grounding end of the first microcontroller is grounded.

6. A load monitoring and diagnostic circuit for a camera according to claim 5, characterized in that: A plurality of thresholds are preset in the first microcontroller, and the plurality of thresholds are compared with the voltage value of the monitoring resistor R3 to judge the real-time connection state of the camera device. The connection states include a load-to-ground short circuit fault, a load-to-power supply fault, a load open circuit fault, and a load normal state.

7. A load monitoring and diagnostic circuit for a camera according to claim 6, characterized in that: The multiple thresholds include 0V, >(U1 - U3) / (R2 + R3)*R3, U2 / (R1 + R2 + R3)*R3, (U1 - U3) / (R2 + R3)*R3. Among them, the connection state corresponding to 0V is the load short - circuit to ground fault state, the connection state corresponding to >(U1 - U3) / (R2 + R3)*R3 is the load to power supply fault state, the connection state corresponding to U2 / (R1 + R2 + R3)*R3 is the load open - circuit fault state, and the connection state corresponding to (U1 - U3) / (R2 + R3)*R3 is the load normal state; where U1 is the voltage value of the rated voltage U1 of the VCC1 power supply, U2 is the voltage value of the rated voltage U2 of the VCC2 excitation source, U3 is the voltage division value of the diode D1, R1 is the resistance value of the shunt resistor R1, R2 is the resistance value of the voltage - dividing resistor R2, and R3 is the resistance value of the monitoring resistor R3.

8. A load monitoring and diagnostic circuit for a camera according to claim 7, characterized in that: A display screen is provided on the first microcontroller for displaying the voltage value of the monitoring resistor R3.

9. A load monitoring and diagnostic circuit for a camera according to claim 5, characterized in that: It further includes a remote monitoring device. The remote monitoring device is electrically connected to the first microcontroller to monitor the real - time connection state of the camera device. An alarm device is provided on the remote monitoring device for alarming when a load fails.

10. A load monitoring and diagnostic circuit for a camera according to claim 9, characterized in that: It further includes a second microcontroller. The power supply terminal of the camera device is connected in parallel to the second microcontroller to detect the voltage value at this place. The grounding terminal of the second microcontroller is grounded. A display screen is provided on the second microcontroller for displaying the voltage value of the power supply terminal of the camera device.

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