CN111736104A - Current detection calibration method and device and display device - Google Patents
Current detection calibration method and device and display device Download PDFInfo
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- CN111736104A CN111736104A CN202010764819.0A CN202010764819A CN111736104A CN 111736104 A CN111736104 A CN 111736104A CN 202010764819 A CN202010764819 A CN 202010764819A CN 111736104 A CN111736104 A CN 111736104A
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Abstract
The invention discloses a current detection calibration method and device and a display device. The current detection calibration method comprises the following steps: the standard current detection module detects standard currents of the test load under a plurality of detection voltages; the current to be calibrated detection module detects the current to be calibrated of the test load under the detection voltages; the plurality of currents to be calibrated correspond to the plurality of standard currents one to one; the control module receives a plurality of standard currents and a plurality of currents to be calibrated, and obtains bias currents of the current detection module to be calibrated under a plurality of detection voltages according to the plurality of standard currents and the plurality of currents to be calibrated; and storing the plurality of sense voltages and the corresponding plurality of bias currents in a memory module. According to the invention, under a plurality of detection voltages, the bias current of the current detection module to be calibrated is obtained through the standard current detection module, so that the current detection correction can be realized, and the current detection precision is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of current detection, in particular to a current detection calibration method and device and a display device.
Background
With the rapid development of the information society, the demand of people on the endurance time of the mobile phone is higher and higher. The display screen is used as a component with the largest power consumption in display devices such as mobile phones and the like, and has important significance for optimizing the power consumption of the display devices. In order to reduce power consumption, most display devices are provided with a sleep mode in which the current after entering the sleep mode is several microamperes. The display device in the sleep mode has a higher demand for current detection accuracy than in the normal display mode.
When the existing partial current detection chip (for example, INA 226) detects current at microampere level, the chip itself may leak input bias current due to the input of sampled common mode voltage, and the bias current is also different along with the difference of common mode input voltage, so that there is an error in current detection, even after calibration, there is still an error of several microamperes in point detection. Therefore, the conventional partial current detection chip has a problem of low detection accuracy.
Disclosure of Invention
The embodiment of the invention provides a current detection calibration method and a current detection calibration device, which are used for realizing current detection correction and improving the current detection precision.
In a first aspect, an embodiment of the present invention provides a current detection calibration method, where the current detection calibration method includes:
the standard current detection module detects standard currents of the test load under a plurality of detection voltages;
the current to be calibrated detection module detects the current to be calibrated of the test load under the detection voltages; the plurality of currents to be calibrated correspond to the plurality of standard currents one to one;
the control module receives a plurality of standard currents and a plurality of currents to be calibrated, and obtains bias currents of the current detection module to be calibrated under a plurality of detection voltages according to the plurality of standard currents and the plurality of currents to be calibrated; and storing the plurality of sense voltages and the corresponding plurality of bias currents in a memory module;
the current detection module to be calibrated detects the read current under a preset voltage; and the control module receives the reading current, searches for the bias current corresponding to the preset voltage in the storage module, and subtracts the bias current from the reading current to obtain the actual current.
Optionally, the obtaining, according to the plurality of standard currents and the plurality of currents to be calibrated, the bias current of the current detection module to be calibrated under the plurality of detection voltages includes:
and subtracting the standard currents in one-to-one correspondence with the currents to be calibrated from the currents to be calibrated to obtain the bias currents under the detection voltages.
Optionally, after the to-be-calibrated current detection module detects the to-be-calibrated current of the test load at the plurality of detection voltages, the method further includes:
the upper computer receives the plurality of standard currents and the plurality of currents to be calibrated, and obtains bias currents of the current detection module to be calibrated under the plurality of detection voltages according to the plurality of standard currents and the plurality of currents to be calibrated;
the control module receives the bias current and stores the plurality of detected voltages and a corresponding plurality of the bias currents in a storage module.
Optionally, before the standard current detecting module detects the standard current of the test load at a plurality of detection voltages, the method further includes:
connecting a resistance conversion module between the detection end of the standard current detection module and the detection end of the current detection module to be calibrated in series;
the upper computer controls the resistance value of the resistance conversion module to be a preset resistance value.
Optionally, before the standard current detecting module detects the standard current of the test load at a plurality of detection voltages, the method further includes:
the upper computer sends a current calibration command to the control module;
and the control module controls the power supply module to output the detection voltages to the test load according to the current calibration command.
Optionally, the current detection calibration method provided by any embodiment of the present invention is applied to a display device, where the display device includes the current detection module to be calibrated, the control module, and the storage module; in operation of the display device, the current detection calibration method includes:
the current detection module to be calibrated detects the reading current of the load of the display device under a preset voltage;
the control module receives the reading current and searches for the bias current corresponding to the preset voltage in the storage module; and obtaining an actual current according to the reading current and the bias current.
Optionally, the obtaining an actual current according to the read current and the bias current includes:
subtracting the bias current from the read current to obtain the actual current.
Optionally, the receiving, by the control module, the read current and searching for a bias current corresponding to the preset voltage in the storage module includes:
the control module receives the read current;
the control module searches for two storage voltages adjacent to the preset voltage and two bias currents corresponding to the two storage voltages in the storage module;
and the control module calculates the bias current corresponding to the preset voltage by adopting a piecewise linear method.
In a second aspect, an embodiment of the present invention provides a display device, including: the device comprises a current detection module to be calibrated, a control module and a storage module; the storage module stores a plurality of detection voltages and a plurality of corresponding bias currents; the current detection module to be calibrated is used for detecting the reading current of the load of the display device under a preset voltage; the control module is used for receiving the reading current and searching the bias current corresponding to the preset voltage in the storage module; and obtaining an actual current according to the reading current and the bias current.
In a third aspect, an embodiment of the present invention provides a current detection calibration apparatus, including: the device comprises a standard current detection module, a test load, a current detection module to be calibrated, a control module and a storage module;
the standard current detection module is connected with a test load and is used for detecting standard currents of the test load under a plurality of detection voltages;
the current detection module to be calibrated is connected with the test load, and is used for detecting the current to be calibrated of the test load under the detection voltages; the plurality of currents to be calibrated correspond to the plurality of standard currents one to one; the current detection module to be calibrated is also used for detecting the reading current under the preset voltage;
the control module is connected with the standard current detection module, the control module is connected with the current detection module to be calibrated, and the control module is connected with the storage module; the control module is used for receiving a plurality of standard currents and a plurality of currents to be calibrated, and obtaining bias currents of the current detection module to be calibrated under a plurality of detection voltages according to the plurality of standard currents and the plurality of currents to be calibrated; and storing the plurality of sense voltages and the corresponding plurality of bias currents in a memory module; receiving the reading current, searching a bias current corresponding to the preset voltage in the storage module, and subtracting the bias current from the reading current to obtain an actual current;
the storage module is used for storing the plurality of detection voltages and the corresponding plurality of bias currents.
According to the current detection calibration method provided by the embodiment of the invention, the bias current of the current detection module to be calibrated under a plurality of detection voltages is obtained according to a plurality of standard currents and a plurality of currents to be calibrated under a plurality of detection voltages, and the plurality of detection voltages and a plurality of corresponding bias currents are stored in the storage module. In the current detection process of the current detection module to be calibrated, the storage module can provide bias currents under a plurality of detection voltages for the current detection module to be calibrated, can provide accurate ground current calibration for the current detection module to be calibrated, and eliminates current detection errors. Therefore, compared with the prior art, the embodiment of the invention realizes more accurate current detection and correction, can realize microampere current detection and improves the accuracy of current detection.
Drawings
Fig. 1 is a schematic flow chart of a current detection calibration method according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of another current detection calibration method according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating another current detection calibration method according to an embodiment of the present invention;
FIG. 4 is a schematic flowchart of a current detection calibration method applied to a display device according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of another display device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a current detection calibration apparatus according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another current detection calibration apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides a current detection calibration method, which can be realized based on a current detection calibration device and is suitable for calibrating a current detection module waiting for calibration of a current detection chip in a display device. Fig. 1 is a schematic flow chart of a current detection calibration method according to an embodiment of the present invention. As shown in fig. 1, the current detection calibration method includes:
and S110, detecting the standard current of the test load under a plurality of detection voltages by a standard current detection module.
The standard current detection module is a module device with high detection precision, and a detection value of the standard current detection module can be used as a reference value (or a standard value). The specific setting mode of the standard current detection module can be selected according to the user requirements, as long as high-precision current detection can be realized, and the detection precision of the standard current detection module is higher than that of the current detection module to be calibrated, and the embodiment does not limit the type of the standard current detection module. Illustratively, the standard current detection module may be, for example, a high-precision multimeter or a high-precision ammeter.
The test load refers to a module device for simulating an actual load. The characteristics of the test load under different detection voltages should be kept as stable as possible to ensure the accuracy of current detection. Alternatively, the test load may be a current sensing resistor or a rheostat having a stable resistance.
S120, detecting the current to be calibrated of the test load under a plurality of detection voltages by a current to be calibrated detection module; the plurality of currents to be calibrated correspond to the plurality of standard currents one to one.
The current detection module to be calibrated has different bias currents under different detection voltages due to the existence of the bias current of the current detection module to be calibrated, and if the fixed bias current is adopted, the current detection precision can be seriously influenced, so that the corresponding bias current needs to be measured under a plurality of detection voltages. According to the embodiment of the invention, the corresponding bias current is obtained by sampling the corresponding standard current and the current to be calibrated under a plurality of detection voltages.
S130, the control module receives a plurality of standard currents and a plurality of currents to be calibrated, and obtains bias currents of the current detection module to be calibrated under a plurality of detection voltages according to the plurality of standard currents and the plurality of currents to be calibrated; and storing the plurality of sense voltages and the corresponding plurality of bias currents in a memory module.
The control module is a module device with functions of operation, processing and the like, and can calculate the bias current under the corresponding detection voltage according to the received standard current and the current to be calibrated. The control module may be selected according to a user requirement during specific implementation, as long as functions such as operation and processing can be implemented, and the type of the control module is not limited in this embodiment. Illustratively, the control module can be an upper computer, a micro control unit or a combination of the upper computer and the micro control unit. The memory module refers to a module device having a memory function, and the memory module may be, for example, a memory in a display device, and the memory may be mounted in the display device for supplying a bias current at a corresponding voltage in current detection of the display device. The storage module can also be an external storage, and under the control of the upper computer, the external storage can transmit a plurality of stored detection voltages and a plurality of corresponding bias currents to the display device, so that the detection currents of the display device can be used.
S140, detecting the reading current under the preset voltage by a current detection module to be calibrated; the control module receives the read current, searches for the bias current corresponding to the preset voltage in the storage module, and subtracts the bias current from the read current to obtain the actual current.
According to the current detection calibration method provided by the embodiment of the invention, the bias current of the current detection module to be calibrated under a plurality of detection voltages is obtained according to a plurality of standard currents and a plurality of currents to be calibrated under a plurality of detection voltages, and the plurality of detection voltages and a plurality of corresponding bias currents are stored in the storage module. In the current detection process of the current detection module to be calibrated, the storage module can provide bias currents under a plurality of detection voltages for the current detection module to be calibrated, can provide accurate ground current calibration for the current detection module to be calibrated, and eliminates current detection errors. Therefore, compared with the prior art, the embodiment of the invention realizes more accurate current detection and correction, can realize microampere current detection and improves the accuracy of current detection.
Fig. 2 is a schematic flow chart of another current detection calibration method according to an embodiment of the present invention. As shown in fig. 2, in addition to the above embodiments, the present embodiment further divides the functions of the control module. Optionally, the control module is a micro control unit in the display device, the storage module is a memory in the display device, the current detection calibration device comprises an upper computer, and the upper computer can execute the functions of operation, processing and the like.
Specifically, the current detection calibration method comprises the following steps:
s210, the standard current detection module detects standard current of the test load under a plurality of detection voltages.
S220, detecting the current to be calibrated of the test load under a plurality of detection voltages by a current to be calibrated detection module; the plurality of currents to be calibrated correspond to the plurality of standard currents one to one.
And S230, the upper computer receives the plurality of standard currents and the plurality of currents to be calibrated, and obtains the bias currents of the current detection module to be calibrated under the plurality of detection voltages according to the plurality of standard currents and the plurality of currents to be calibrated.
The bias current may be calculated by subtracting a plurality of standard currents corresponding to the plurality of currents to be calibrated one by one from the plurality of currents to be calibrated to obtain the bias currents under the plurality of detection voltages.
S240, the control module receives the bias current and stores a plurality of detection voltages and a plurality of corresponding bias currents in the storage module.
As can be seen from the above steps, the current detection calibration method provided by this embodiment obtains the bias current by calculation using the upper computer, which is beneficial to simplifying the processing steps of the control module.
In an embodiment of the present invention, the detection voltage may be provided by a power module built in the display device, or may be provided by an external power module. Preferably, the control module, the storage module and the power supply module are all built-in modules in the display device, and the arrangement makes the working environment of the current detection module to be calibrated in the calibration process closer to the working environment in practical application. Specifically, the upper computer issues a voltage output instruction to the control module, and the control module controls the power supply module to output corresponding detection voltage.
In the above embodiments, the step of detecting the standard current of the test load at the plurality of detection voltages by the standard current detection module includes a step of detecting the plurality of standard currents; accordingly, in the step of detecting the current to be calibrated of the test load at the plurality of detection voltages by the current to be calibrated detection module, the detection step of the plurality of currents to be calibrated is included. This will be explained below.
Fig. 3 is a schematic flow chart of another current detection calibration method according to an embodiment of the present invention. As shown in fig. 3, based on the above embodiments, optionally, the current detection calibration method includes:
and S310, the upper computer controls the standard current detection module to be switched to a current detection mode.
The standard current detection module may be, for example, a multimeter, and the multimeter has multiple detection modes of physical quantities, such as a voltage detection mode, a resistance detection mode, and a current detection mode. The embodiment of the invention needs to be switched to a current detection mode to detect and calibrate the current.
And S320, connecting the resistance conversion module between the detection end of the standard current detection module and the detection end of the current detection module to be calibrated in series.
The resistance conversion module is a specific setting mode of a test load, and is used for adjusting the current detected by the standard current detection module and the current detection module to be calibrated. The resistance conversion module can be selected according to user requirements during specific implementation, as long as resistance conversion can be achieved, and the type of the resistance conversion module is not limited in this embodiment. Illustratively, the resistance conversion module may be a varistor.
And S330, controlling the resistance value of the resistance conversion module to be a preset resistance value by the upper computer.
The resistance conversion module is adjusted to a preset resistance value, so that the current to be calibrated detected by the current to be calibrated detection module is closer to the bias current of the current to be calibrated detection module. The preset resistance value can be selected according to the user requirement in specific implementation, and the size of the preset resistance value is not limited in the embodiment. Alternatively, the preset resistance value is a large resistance value of the varistor.
And S340, the upper computer sends a current calibration command to the control module.
Wherein the current calibration command includes outputting a plurality of detection voltages to the test load.
And S350, controlling the power supply module to output the detection voltage V1 to the test load by the control module according to the current calibration command.
And S360, detecting the standard current A2' of the test load under the detection voltage by the standard current detection module.
And S370, detecting the current A1' to be calibrated of the test load under the detection voltage by the current detection module to be calibrated.
And S380, the control module reads the current A1 'to be calibrated of the current detection module to be calibrated and transmits the current A1' to the upper computer.
S390, the upper computer receives the standard current A2 'and the current A1' to be calibrated, and obtains the bias current A1 of the current detection module to be calibrated under the detection voltage according to the standard current and the current to be calibrated;
wherein, optionally, a1= a1 '-a 2'.
And S3A0, repeating S340-S390, and collecting n groups of different voltages and corresponding bias leakage currents under the n groups of different voltages to be respectively marked as V1 … Vn and A1 … An.
And S3B0, the upper computer transmits the acquired n groups of different voltages V1 … Vn and the acquired n groups of corresponding bias leakage currents A1 … An under different voltages to the control module, and the control module stores the received data in the storage module.
In the current detection and calibration method provided by the embodiment, in the current detection process of the current detection module to be calibrated, the storage module may provide bias currents under a plurality of detection voltages for the current detection module to be calibrated, may provide accurate ground current calibration for the current detection module to be calibrated, and eliminates current detection errors. Therefore, compared with the prior art, the embodiment of the invention realizes more accurate current detection and correction, can realize microampere current detection and improves the accuracy of current detection. In addition, the current detection module to be calibrated detects that the current to be calibrated is closer to the bias current of the current detection module to be calibrated by using the resistance conversion module, so that the current detection precision is further improved.
In the above embodiments, the manner of obtaining the bias current is exemplarily shown, and in addition to the above embodiments, the following describes an embodiment of the calibration method in a specific application.
Fig. 4 is a flowchart illustrating a current detection calibration method applied to a display device according to another embodiment of the present invention. As shown in fig. 4, the current detection calibration method provided by any of the above embodiments is applied to a display device, and the display device includes a current detection module to be calibrated, a control module, and a storage module.
The current detection module to be calibrated is used for detecting the current of the load of the display device under the preset voltage, and the current detection module to be calibrated calculates the bias current under different detection voltages by applying the method of any embodiment. The control module is used for receiving the read current of the current detection module to be calibrated, searching the bias current corresponding to the preset voltage in the storage module, and obtaining the actual current according to the read current and the bias current; alternatively, the control module may be a micro control unit. The storage module stores the detection voltages and the corresponding bias currents; alternatively, the storage module may be a memory.
Specifically, the control module is electrically connected with the current detection module to be calibrated, and the control module is electrically connected with the storage module.
In the operation of the display device, the current detection calibration method comprises the following steps:
s410, the current detection module to be calibrated detects the reading current of the load of the display device under the preset voltage.
The preset voltage is the voltage required by the display device during normal work, and is set according to actual requirements during specific implementation.
S420, the control module receives the reading current and searches for the bias current corresponding to the preset voltage in the storage module; and obtains the actual current from the read current and the bias current.
There are various ways to obtain the actual current according to the read current and the bias current, and optionally, the actual current is obtained by subtracting the bias current from the read current.
The embodiment is arranged in such a way that corresponding bias currents are obtained according to different preset voltages, and current detection errors in the current detection module to be calibrated are eliminated in a targeted manner. Therefore, compared with the prior art, the embodiment of the invention realizes more accurate current detection correction and improves the accuracy of current detection.
In the foregoing embodiment, further, the step of receiving the read current by the control module and searching for the bias current corresponding to the preset voltage in the storage module includes:
the control module receives the reading current;
the control module searches two storage voltages adjacent to a preset voltage and two bias currents corresponding to the two storage voltages in the storage module;
in order to save the storage space of the storage module, a plurality of detection voltages stored by the storage module are stored in a segmented manner; it is not necessary that the storage voltage has exactly the same value as the preset voltage. Two storage voltages adjacent to the preset voltage and two bias currents corresponding to the two storage voltages can be searched to obtain the bias current corresponding to the preset voltage, so that the calculated bias current is accurate.
The control module calculates bias current corresponding to the preset voltage by adopting a piecewise linear method.
And fitting the read discrete storage voltage point values and the corresponding bias current point values stored in the storage module into a continuous curve by the control module through a piecewise linear method, so as to obtain the bias current corresponding to any preset voltage.
According to the current detection and calibration method applied to the display device, the corresponding bias current is searched according to the preset voltage, the actual current is obtained according to the read current and the searched bias current, the problem of current detection errors caused by the irregular bias current of the current detection module to be calibrated under different voltages is solved, the current detection precision is improved, microampere-level current detection can be realized, and the requirement of the display device on the current detection precision is met.
The embodiment of the invention also provides a display device, and the display device can be a mobile phone, a computer, wearable equipment and the like. Fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 5, the display device includes: a current detection module to be calibrated 510, a control module 520 and a storage module 530; the storage module 530 stores a plurality of detection voltages and a plurality of corresponding bias currents; the current detection module to be calibrated 510 is configured to detect a read current of a load of the display device at a preset voltage; the control module 520 is configured to receive the read current and search for a bias current corresponding to a preset voltage in the storage module 530; and obtains the actual current from the read current and the bias current.
Specifically, the control module 520 is electrically connected to the current detection module to be calibrated 510, and the control module 520 is electrically connected to the storage module 530.
The display device provided by the embodiment of the invention can use the current detection calibration method provided by each embodiment to search the corresponding bias current according to the preset voltage and obtain the actual current according to the read current and the searched bias current, so that the problem of current detection errors caused by the irregular bias current of the current detection module to be calibrated under different voltages is solved, the current detection precision is improved, and the requirement of the display device on the current detection precision is met.
Fig. 6 is a schematic structural diagram of another display device according to an embodiment of the present invention, and as shown in fig. 6, optionally, the display device 500 further includes a display load 540, a power module 550, and a sampling resistor 560, where the current detection module to be calibrated 510 includes a power pin 511, a sampling pin 513, and an output pin 512, the power pin 511 is electrically connected to an output terminal 551 of the power module, the power pin 511 is electrically connected to a first end 561 of the sampling resistor 560, the sampling pin 513 is electrically connected to a second end 562 of the sampling resistor 560, the sampling pin 513 is further electrically connected to a first end 541 of the display load 540, and a second end 542 of the display load 540 is grounded. The output pin 512 of the current detection module to be calibrated 510 is electrically connected to the receiving pin 522 of the control module 520. The power module 550 may be, for example, a DC/DC power supply, and preferably, the power module 550 is a BUCK power supply. The power module 550 may provide power to the display load 540 at the same time as power is provided to the control module 520.
With continued reference to fig. 6, optionally, the control signal output 521 of the control module 520 is electrically connected to the control signal input 552 of the power module 550; the data output terminal 523 of the control module 520 is electrically connected to the data input terminal 531 of the memory module 530.
The embodiment of the invention also provides a current detection and calibration device, which can be used for realizing the current detection and calibration method provided by the embodiments and has corresponding beneficial effects.
Fig. 7 is a schematic structural diagram of a current detection calibration apparatus according to an embodiment of the present invention. As shown in fig. 7, the current detection calibration apparatus includes: the device comprises a standard current detection module 610, a test load 620, a current detection to be calibrated module 630, a control module 640 and a storage module 650.
The standard current detection module 610 is connected to the test load 620, and the standard current detection module 610 is configured to detect a standard current of the test load 620 under a plurality of detection voltages. The current to be calibrated detection module 630 is connected to the test load 620, and the current to be calibrated detection module 630 is configured to detect a current to be calibrated of the test load 620 under a plurality of detection voltages; the plurality of currents to be calibrated correspond to the plurality of standard currents one to one; the current detection module to be calibrated 630 is further configured to detect a read current at a preset voltage. The control module 640 is connected with the standard current detection module 610, the control module 640 is connected with the current detection module to be calibrated 630, and the control module 640 is connected with the storage module 650; the control module 640 is configured to receive a plurality of standard currents and a plurality of currents to be calibrated, and obtain bias currents of the current to be calibrated detection module 630 at a plurality of detection voltages according to the plurality of standard currents and the plurality of currents to be calibrated; and storing the plurality of sense voltages and the corresponding plurality of bias currents in the memory module 650; and receiving the read current, searching for a bias current corresponding to the preset voltage in the storage module 650, and subtracting the bias current from the read current to obtain an actual current. The storage module 650 is used for storing a plurality of detection voltages and a plurality of corresponding bias currents.
Fig. 8 is a schematic structural diagram of another current detection calibration apparatus according to an embodiment of the present invention. As shown in fig. 8, on the basis of the above embodiment, optionally, the current detection calibration apparatus includes: the display device comprises an upper computer 680, a Universal Serial Bus Hub (USB Hub) 690, a standard current detection module 610, a resistance transformation module 660 and the display device 600.
Wherein, the display device 600 includes: a current detecting resistor 601, a current detecting chip 602, a power supply 670, a Micro Control Unit (MCU) 603 and a memory 604.
Optionally, the resistance conversion module 660 is a rheostat, the current detection resistor 601 and the resistance conversion module 660 serve as a test load, the current detection chip 602 is equivalent to a current detection module to be calibrated, and the resistance conversion module 660 is configured to adjust the current magnitudes detected by the standard current detection module 610 and the current detection chip 602. The power supply 670 is a DC/DC BUCK power supply for outputting different detection voltages; the mcu 603 corresponds to a control module, and the memory 604 corresponds to a memory module.
The resistance conversion module 660 is connected in series between the standard current detection module 610 and the display device 600, the host computer 680 is connected with the universal serial bus hub 690, the universal serial bus hub 690 is connected with the standard current detection module 610, the universal serial bus hub 690 is connected with the resistance conversion module 660, and the universal serial bus hub 690 is connected with the display device 600.
Specifically, the upper computer 680 controls the standard current detection module 610 to switch to a current detection mode, and the upper computer 680 controls the resistance value of the resistance conversion module 660 to be a preset resistance value through the universal serial bus hub 690; the upper computer 680 sends a current calibration command to the micro control unit 603 through the universal serial bus hub 690; the micro control unit 603 controls the power supply 670 to output a detection voltage V1 to the test load according to the current calibration command, the standard current detection module 610 detects a standard current A2 'of the test load under the detection voltage, the current detection chip 602 detects a current A1' to be calibrated of the test load under the detection voltage, the upper computer 680 receives the standard current and the current to be calibrated through the universal serial bus hub 690, and obtains a bias current A1 of the current detection module to be calibrated under the detection voltage according to the standard current and the current to be calibrated; repeating the above steps, collecting n groups of different voltages and n groups of corresponding bias leakage currents at different voltages as V1 … Vn, a1 … An, respectively, transmitting the collected n groups of different voltages and n groups of corresponding bias leakage currents at different voltages to the mcu 603 by the upper computer 680, and storing the received data in the memory 604 by the mcu 603.
The current detection calibration apparatus provided in the embodiment of the present invention can apply the current detection calibration method provided in any of the above embodiments, obtain the bias current of the current detection module to be calibrated at a plurality of detection voltages according to a plurality of standard currents and a plurality of currents to be calibrated at a plurality of detection voltages, and store the plurality of detection voltages and a plurality of corresponding bias currents in the storage module. In the current detection process of the current detection module to be calibrated, the storage module can provide bias currents under a plurality of detection voltages for the current detection module to be calibrated, can provide accurate ground current calibration for the current detection module to be calibrated, and eliminates current detection errors. Therefore, compared with the prior art, the embodiment of the invention realizes more accurate current detection and correction, can realize microampere current detection and improves the accuracy of current detection.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method of current sensing calibration, comprising:
the standard current detection module detects standard currents of the test load under a plurality of detection voltages;
the current to be calibrated detection module detects the current to be calibrated of the test load under the detection voltages; the plurality of currents to be calibrated correspond to the plurality of standard currents one to one;
the control module receives a plurality of standard currents and a plurality of currents to be calibrated, and obtains bias currents of the current detection module to be calibrated under a plurality of detection voltages according to the plurality of standard currents and the plurality of currents to be calibrated; and storing the plurality of sense voltages and the corresponding plurality of bias currents in a memory module;
the current detection module to be calibrated detects the read current under a preset voltage; and the control module receives the reading current, searches for the bias current corresponding to the preset voltage in the storage module, and subtracts the bias current from the reading current to obtain the actual current.
2. The method according to claim 1, wherein the obtaining the bias current of the current detection module to be calibrated at the plurality of detection voltages according to the plurality of standard currents and the plurality of currents to be calibrated comprises:
and subtracting the standard currents in one-to-one correspondence with the currents to be calibrated from the currents to be calibrated to obtain the bias currents under the detection voltages.
3. The method according to claim 1, further comprising, after the current-to-be-calibrated detection module detects the current-to-be-calibrated of the test load at the plurality of detection voltages:
the upper computer receives the plurality of standard currents and the plurality of currents to be calibrated, and obtains bias currents of the current detection module to be calibrated under the plurality of detection voltages according to the plurality of standard currents and the plurality of currents to be calibrated;
the control module receives the bias current and stores the plurality of detected voltages and a corresponding plurality of the bias currents in a storage module.
4. The method of claim 1, wherein before the standard current detection module detects the standard current of the test load at a plurality of detection voltages, the method further comprises:
connecting a resistance conversion module between the detection end of the standard current detection module and the detection end of the current detection module to be calibrated in series;
the upper computer controls the resistance value of the resistance conversion module to be a preset resistance value.
5. The method of claim 1, wherein before the standard current detection module detects the standard current of the test load at a plurality of detection voltages, the method further comprises:
the upper computer sends a current calibration command to the control module;
and the control module controls the power supply module to output the detection voltages to the test load according to the current calibration command.
6. The current detection calibration method according to any one of claims 1 to 5, applied to a display device, wherein the display device comprises the current detection module to be calibrated, the control module and the storage module; in operation of the display device, the current detection calibration method includes:
the current detection module to be calibrated detects the reading current of the load of the display device under a preset voltage;
the control module receives the reading current and searches for the bias current corresponding to the preset voltage in the storage module; and obtaining an actual current according to the reading current and the bias current.
7. The method of claim 6, wherein the deriving an actual current from the read current and the bias current comprises:
subtracting the bias current from the read current to obtain the actual current.
8. The method according to claim 6, wherein the step of receiving the read current and searching the memory module for the bias current corresponding to the preset voltage comprises:
the control module receives the read current;
the control module searches for two storage voltages adjacent to the preset voltage and two bias currents corresponding to the two storage voltages in the storage module;
and the control module calculates the bias current corresponding to the preset voltage by adopting a piecewise linear method.
9. A display device, comprising: the device comprises a current detection module to be calibrated, a control module and a storage module; the storage module stores a plurality of detection voltages and a plurality of corresponding bias currents; the current detection module to be calibrated is used for detecting the reading current of the load of the display device under a preset voltage; the control module is used for receiving the reading current and searching the bias current corresponding to the preset voltage in the storage module; and obtaining an actual current according to the reading current and the bias current.
10. A current sensing calibration device, comprising: the device comprises a standard current detection module, a test load, a current detection module to be calibrated, a control module and a storage module;
the standard current detection module is connected with the test load and is used for detecting standard current of the test load under a plurality of detection voltages;
the current detection module to be calibrated is connected with the test load, and is used for detecting the current to be calibrated of the test load under the detection voltages; the plurality of currents to be calibrated correspond to the plurality of standard currents one to one; the current detection module to be calibrated is also used for detecting the reading current under the preset voltage;
the control module is connected with the standard current detection module, the control module is connected with the current detection module to be calibrated, and the control module is connected with the storage module; the control module is used for receiving a plurality of standard currents and a plurality of currents to be calibrated, and obtaining bias currents of the current detection module to be calibrated under a plurality of detection voltages according to the plurality of standard currents and the plurality of currents to be calibrated; and storing the plurality of sense voltages and the corresponding plurality of bias currents in a memory module; receiving the reading current, searching a bias current corresponding to the preset voltage in the storage module, and subtracting the bias current from the reading current to obtain an actual current;
the storage module is used for storing the plurality of detection voltages and the corresponding plurality of bias currents.
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