CN221081409U - Circuit and device for measuring current of camera module - Google Patents
Circuit and device for measuring current of camera module Download PDFInfo
- Publication number
- CN221081409U CN221081409U CN202323110546.6U CN202323110546U CN221081409U CN 221081409 U CN221081409 U CN 221081409U CN 202323110546 U CN202323110546 U CN 202323110546U CN 221081409 U CN221081409 U CN 221081409U
- Authority
- CN
- China
- Prior art keywords
- sampling
- unit
- camera module
- circuit
- electrically connected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005070 sampling Methods 0.000 claims abstract description 82
- 238000012545 processing Methods 0.000 claims abstract description 40
- 238000005259 measurement Methods 0.000 claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 6
- 230000006978 adaptation Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model provides a circuit for measuring current of a camera module, which comprises: the system comprises a processing unit, a power supply adapting unit, a controlled N1 switch, a sampling measuring unit and an analog-to-digital conversion unit, wherein the sampling measuring unit comprises N sampling measuring branches, and each sampling branch comprises a sampling resistor and a differential operational amplifier corresponding to different measuring ranges. The circuit can be used for current measurement of different states of different types of camera modules, and can be used for adaptively setting a current measurement range so as to obtain better measurement accuracy. The output voltage value of the power supply adapting unit can be set, so that continuously adjustable output voltage can be flexibly provided, and a larger measuring range can be covered.
Description
Technical Field
The utility model relates to the technical field of measuring circuits, in particular to a circuit and a device for measuring current of a camera module.
Background
With the development of network technology and video image processing technology, intelligent terminal equipment with high-quality camera shooting function, automatic driving based on vehicle-mounted vision, intelligent factories based on industrial vision, unmanned aerial vehicles based on vision and/or image recognition and the like are increasingly demanded, and demands for various camera modules are rapidly increased.
The camera module has more production and manufacturing processes and high performance requirements, so that various detections are needed after the production process and assembly are completed, and the detection also comprises the measurement of the current of the camera module, and whether the working state of the camera module is abnormal can be judged according to the measurement result.
In the prior art, current measurement can be performed on the camera module only in a fixed range, and power consumption of the camera module in different states may be different by several orders of magnitude, for example, power consumption of a vehicle-mounted camera module in a power-off mode is usually only tens to hundreds of microwatts, power consumption in a sleep mode is several milliwatts, and power consumption in an operating mode may exceed 1 watt. Therefore, if measurement accuracy is to be ensured, it is generally necessary to employ different fixed ranges for different operation modes, whereas if one fixed range is employed, measurement accuracy in each state cannot be ensured.
Disclosure of utility model
The utility model aims to provide a circuit capable of adaptively setting a range to measure camera module current.
To achieve the above object, one embodiment of the present utility model provides a circuit for camera module current measurement, wherein the circuit includes:
The device comprises a processing unit, a power supply adapting unit, a controlled N1 switch, a sampling measuring unit and an analog-to-digital conversion unit, wherein the sampling measuring unit comprises N sampling measuring branches, and each sampling branch comprises a sampling resistor and a differential operational amplifier corresponding to different measuring ranges;
The processing unit is respectively and electrically connected with the power-on control end of the power supply adapting unit, the control end of the controlled N1 switch and the output end of the analog-to-digital conversion unit;
The output end of the power supply adapting unit is respectively and electrically connected with the fixed end of the controlled N1 switch and one input end of the homopolar differential operational amplifier of each sampling branch of the sampling measuring unit;
Each branch end of the controlled N1 switch is respectively and electrically connected with one end of a sampling resistor of each sampling branch of the sampling measurement unit;
The other end of the sampling resistor of each sampling branch of the sampling measurement unit is electrically connected with the other input end of the same polarity of the differential operational amplifier of the same branch, and the other end of the sampling resistor of each sampling branch of the sampling measurement unit is also electrically connected with the power input end of the camera module to be measured;
The output end of the differential operational amplifier of each sampling branch of the sampling measurement unit is electrically connected with one input end of the analog-digital conversion unit respectively.
Further, the processing unit further comprises a deserializer, and the deserializer is electrically connected with the camera module to be tested to obtain image data collected by the camera module to be tested.
Further wherein the circuit further comprises:
A storage unit, a transmission interface, wherein,
The storage unit is electrically connected with the processing unit and is used for storing the image data acquired by the processing unit;
the transmission interface is electrically connected with the upper computer and is used for transmitting the image data to the upper computer.
Another embodiment of the present utility model further provides an apparatus for camera module current measurement, where the apparatus includes the circuit of the foregoing embodiment and/or an alternative embodiment.
The working principle of the utility model is as follows:
When the current of the camera module to be tested is measured, the processing unit sends a control signal to the power supply adaptation unit, so that the power supply adaptation unit is electrified, the voltage value is output after the adaptation is carried out according to the external input voltage, and the control signal is sent to the controlled N1-select switch according to the set parameter initial value corresponding to the default range, the switch is switched to a sampling branch corresponding to the default range, the sampling branch is conducted, wherein the sampling branch and the camera module to be tested are in the same circuit loop, and the current is the same. The method comprises the steps of collecting voltages at two ends of a sampling resistor on a sampling branch, processing the voltages through a differential operational amplifier on the sampling branch to output differential voltages, processing the differential voltages into digital quantities corresponding to the differential voltages through an analog-to-digital conversion unit, inputting the digital quantities into a processing unit, calculating the digital quantities (quotient of the differential voltages and sampling resistance values on the sampling branch) in the processing unit to obtain digital quantities corresponding to currents of camera modules to be measured, matching the digital quantities with different range thresholds corresponding to each sampling branch stored in the processing unit to determine the sampling branch with highest measurement accuracy, sending corresponding control signals to a controlled N-select 1 switch according to a matching result, switching the sampling branch with highest measurement accuracy to obtain the currents of the camera modules to be measured, and completing current measurement of the camera modules to be measured under the current state. When measuring the current of the camera module to be measured in different states, the measuring device does not need to be replaced. Further, the processing unit can also acquire image data acquired by the camera module to be detected. Further, the magnitude of the output voltage value of the power adaptation unit may also be set by the processing unit sending a signal to the power adaptation unit.
Compared with the prior art, the utility model has the following beneficial effects:
The current measuring device can be used for current measurement of different states of different types of camera modules, and can be used for adaptively setting current measuring ranges so as to obtain better measuring accuracy. The output voltage value of the power supply adapting unit can be set, so that continuously adjustable output voltage can be flexibly provided, and a larger measuring range can be covered.
Drawings
Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a circuit configuration for camera module current measurement according to an embodiment of the present utility model;
FIG. 2 shows a schematic diagram of the processing unit of an alternative embodiment of the utility model;
the same or similar reference numbers in the drawings refer to the same or similar parts.
Detailed Description
The conception, specific structure and technical effects of the circuit for measuring camera module current provided by the utility model will be further described with reference to the accompanying drawings so as to fully understand the objects, features and effects of the utility model. In which embodiments and/or alternative embodiments of the utility model are shown, it should be understood that those skilled in the art may modify the utility model here described while still achieving the beneficial effects of the utility model. Accordingly, the following description is to be construed as broadly known to those skilled in the art and not as limiting the utility model.
Further description will be provided below with reference to specific examples.
A schematic circuit structure of the current measurement circuit for a camera module according to an embodiment of the present utility model as shown in fig. 1, wherein the circuit 10 includes:
The device comprises a processing unit 100, a power supply adapting unit 200, a controlled N-selection 1 switch 300, a sampling measuring unit 400 and an analog-to-digital conversion unit 500, wherein the sampling measuring unit 400 comprises N sampling measuring branches, and each sampling branch comprises a sampling resistor 410 and a differential operational amplifier 420 corresponding to different measuring ranges;
The processing unit 100 is electrically connected with the power-on control end of the power supply adapting unit 200, the control end of the controlled N1 switch 300 and the output end of the analog-digital conversion unit 500 respectively;
The output end of the power supply adapting unit 200 is respectively and electrically connected with the fixed end of the controlled N1 switch 300 and one input end of the homopolarity differential operational amplifier 420 of each sampling branch of the sampling measuring unit 400;
Each branch end of the controlled N-ary 1 switch 300 is electrically connected with one end of a sampling resistor 410 of each sampling branch of the sampling measurement unit 400;
The other end of the sampling resistor 410 of each sampling branch of the sampling measurement unit 400 is electrically connected with the other input end of the same polarity of the differential operational amplifier 420 of the same branch, and the other end of the sampling resistor 410 of each sampling branch of the sampling measurement unit 400 is also electrically connected with the power input end of the camera module to be tested;
The output end of the differential operational amplifier 420 of each sampling branch of the sampling measurement unit 400 is electrically connected to one input end of the analog-to-digital conversion unit 500.
The process of measuring the current of the camera module to be measured based on the circuit 10: when the current of the camera module to be measured starts to be measured, the processing unit 100 firstly outputs the control signal en_switch to the power supply adapting unit 200, controls the power supply adapting unit 200 to output the voltage after adapting according to the external input voltage Vin, and sends the control signal key_switch to the controlled N1 Switch 300 according to the set parameter corresponding to the default range, and switches the Switch to one sampling branch of the sampling measuring unit 400 corresponding to the default range, so that the sampling branch is conducted, wherein the sampling branch and the camera module to be measured are in the same circuit loop, and the current is the same. The voltages at two ends of the sampling resistor 410 on the sampling branch are collected, the differential voltages are output after being processed by the differential operational amplifier 420 on the same sampling branch, the differential voltages are processed into digital quantities corresponding to the differential voltages by the analog-to-digital conversion unit 500 and then are input into the processing unit 100, the digital quantities corresponding to the current of the camera module to be tested are obtained after calculation (quotient of the differential voltages and the sampling resistor value on the sampling branch) in the processing unit 100, and the digital quantities are matched with different range thresholds corresponding to each sampling branch stored in the processing unit 100 so as to determine the sampling branch with the highest measurement accuracy. And the processing unit 100 sends a corresponding control signal KEY_Switch to the controlled N1 Switch 300 according to the matching result, and switches to the sampling branch with the highest measurement precision to measure the current of the camera module to be measured, so that the current of the camera module to be measured with the highest measurement precision can be obtained. After completing the current measurement of the camera module to be tested, the processing unit 100 outputs the control signal en_switch to the power supply adapting unit 200, so that the power supply adapting unit 200 is powered off, and the risk of damage caused by impact of voltage fluctuation to each unit and/or device in the circuit 10 when the external input voltage Vin is directly turned off is avoided. The power adaptation unit 200 will typically also power other units and/or active devices (e.g., the analog-to-digital conversion unit 500, the differential operational amplifier 420, etc.) in the circuit 10 that include the active devices.
By adopting the measuring device comprising the circuit, the current measuring range can be adaptively set to measure the current of various camera modules and the current of the same camera module in different states, so that better measuring precision is obtained, the application range is wide, the measuring efficiency is high, and the measuring device is particularly suitable for current testing when various camera modules are generated in batches on a factory production line of the camera modules.
Further, the processing unit 100 of an alternative embodiment shown in fig. 2 further includes a deserializer 110, and is electrically connected to the camera module to be tested through the deserializer 110 to obtain the image data collected by the camera module to be tested.
For camera modules that do not integrate an image processor, the raw image data collected by the camera module is usually required to be transmitted to a device integrated with the image processor for processing and optimization, such camera modules collect optical signals obtained by a lens through a sensor and convert the optical signals into electrical signals to obtain raw image data, which are parallel binary data streams, while for convenience of transmission, such camera modules usually integrate a serializer, through which the image data are converted into serial binary data streams, such as MIPI (Mobile Industry Processor Interface ) or DVP (Digital Video Port, digital video port) data, so as to compress the data onto a smaller transmission bandwidth, thereby improving transmission speed and distance. At the receiving side, the serial binary data stream is restored into the parallel binary data stream through the corresponding deserializer, the original image data is restored, and then index test or optimization processing and the like are carried out on the original image data. In one exemplary embodiment, the processing unit 100 includes a deserializer 110, the processing chip in the processing unit 100 may be an FPGA device, and may be electrically connected to the deserializer 110 through a D-PHY hard core interface of the FPGA device, where the deserializer 110 is electrically connected to a serializer of the camera module to be tested through a twisted pair or a coaxial cable, so that the processing unit 100 obtains the image data collected by the camera module to be tested.
Further, the circuit 10 of an alternative embodiment further comprises:
the memory unit 600, the transmission interface 700, wherein,
The storage unit 600 is electrically connected to the processing unit 100, and is used for storing the image data acquired by the processing unit;
the transmission interface 700 is electrically connected to the host computer, and is used for transmitting the image data to the host computer.
The processing unit 100 may further include a deserializer 110, the circuit 10 may further include a storage unit 600 and a transmission interface 700, and the testing device including the circuit 10 may not only measure the current of the camera module to be tested including the serializer, but also acquire the image data collected by the camera module to be tested, save the image data, and transmit the image data to the host computer, and process and analyze the image data through the host computer to obtain the performance index of the camera module to be tested.
The processing unit 100 may further output a setting signal SDA/SCL to the power adapting unit 200, and set relevant adapting parameters of the power adapting unit 200, so as to adapt an external input voltage Vin input to the power adapting unit 200 to a corresponding voltage output according to the adapting parameters, so as to be suitable for current measurement of a camera module to be tested in a corresponding type and working state. So that a continuously adjustable output voltage can be flexibly provided, covering a larger measuring range.
The utility model provides a device for measuring current of a camera module, which comprises the circuit of the embodiment and/or the optional embodiment.
It should be noted that the foregoing descriptions and examples are only for illustrating the technical scheme of the present utility model, and do not limit the present utility model. It should be understood by those skilled in the art that any equivalent replacement or modification of the technical solution and technical content disclosed in the present utility model may be made without departing from the scope of the technical solution of the present utility model, and the scope of the present utility model is covered by the scope of protection of the present utility model.
Furthermore, it is apparent that the term "comprising" does not exclude that a circuit, a device, a means or an apparatus according to the utility model may comprise other elements, units or modules, circuits, means, singular does not exclude a plurality. The plurality of constituent elements, units or modules, circuits recited in the claims may also be implemented as one constituent element, unit or module, circuit. The terms first, second, etc. are used to denote a name, but not any particular order.
Claims (4)
1. A circuit for camera module current measurement, the circuit comprising:
The device comprises a processing unit, a power supply adapting unit, a controlled N1 switch, a sampling measuring unit and an analog-to-digital conversion unit, wherein the sampling measuring unit comprises N sampling measuring branches, and each sampling branch comprises a sampling resistor and a differential operational amplifier corresponding to different measuring ranges;
The processing unit is respectively and electrically connected with the power-on control end of the power supply adapting unit, the control end of the controlled N1 switch and the output end of the analog-to-digital conversion unit;
The output end of the power supply adapting unit is respectively and electrically connected with the fixed end of the controlled N1 switch and one input end of the homopolar differential operational amplifier of each sampling branch of the sampling measuring unit;
Each branch end of the controlled N1 switch is respectively and electrically connected with one end of a sampling resistor of each sampling branch of the sampling measurement unit;
The other end of the sampling resistor of each sampling branch of the sampling measurement unit is electrically connected with the other input end of the same polarity of the differential operational amplifier of the same branch, and the other end of the sampling resistor of each sampling branch of the sampling measurement unit is also electrically connected with the power input end of the camera module to be measured;
The output end of the differential operational amplifier of each sampling branch of the sampling measurement unit is electrically connected with one input end of the analog-digital conversion unit respectively.
2. The circuit of claim 1, wherein the processing unit further comprises a deserializer, and the deserializer is electrically connected with the camera module to be tested to obtain the image data collected by the camera module to be tested.
3. The circuit of claim 2, wherein the circuit further comprises:
A storage unit, a transmission interface, wherein,
The storage unit is electrically connected with the processing unit and is used for storing the image data acquired by the processing unit;
the transmission interface is electrically connected with the upper computer and is used for transmitting the image data to the upper computer.
4. A device for camera module current measurement, characterized in that the device comprises the circuit as claimed in any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323110546.6U CN221081409U (en) | 2023-11-16 | 2023-11-16 | Circuit and device for measuring current of camera module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323110546.6U CN221081409U (en) | 2023-11-16 | 2023-11-16 | Circuit and device for measuring current of camera module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221081409U true CN221081409U (en) | 2024-06-04 |
Family
ID=91251623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323110546.6U Active CN221081409U (en) | 2023-11-16 | 2023-11-16 | Circuit and device for measuring current of camera module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221081409U (en) |
-
2023
- 2023-11-16 CN CN202323110546.6U patent/CN221081409U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209525407U (en) | A kind of camera module abnormal detection circuit, device and camera module tester | |
| US20120153993A1 (en) | Usb port detecting circuit | |
| CN103916116A (en) | Interface level switch device | |
| CN221081409U (en) | Circuit and device for measuring current of camera module | |
| CN117440149A (en) | Circuit, device and method for measuring current of camera module | |
| CN218830444U (en) | CMOS image sensor tester | |
| CN109257247B (en) | Communication module's quality detection system | |
| CN107290649B (en) | Television board card testing device | |
| CN110231513A (en) | A kind of method and device of multiple way electric acquisition and processing | |
| CN115421026A (en) | Aging test method, circuit and system for batch PD chips | |
| CN115459754A (en) | Current-mode and voltage-mode analog quantity signal acquisition switching circuit and control method | |
| CN212255470U (en) | Current stepping sampling circuit of circuit breaker, equipment and Internet of things system | |
| CN110690757B (en) | Data monitoring device of electric power transmission and distribution system | |
| CN113193746A (en) | Full-range voltage conversion circuit with automatically variable input voltage range | |
| CN111693891A (en) | Terminal with communication module and remote diagnosis system | |
| CN105467234A (en) | Cell set voltage acquisition board tool tester | |
| CN211123710U (en) | Data acquisition device and power supply unit | |
| CN105182057A (en) | high precision cell voltage monitoring device | |
| CN101149889B (en) | Display signal detecting device and method | |
| CN211741406U (en) | Electronic equipment and signal acquisition circuit thereof | |
| CN114500854B (en) | Camera module, control method of camera module and camera communication system | |
| CN214702515U (en) | Detection device of infrared sensor | |
| CN213027961U (en) | Input circuit suitable for receiving various meteorological sensor signals | |
| CN116907317B (en) | Automatic identification device and method for vibrating wire type sensor and differential resistance type sensor | |
| CN114896556B (en) | Double-station cable connector detection data digital processing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |