Multi-path power supply calibration device and multi-path power supply calibration system

Abstract

The utility model provides a multipath power supply calibration device and a multipath power supply calibration system. The device comprises a plurality of first switch modules and a second switch module, the input ends of the first switch modules are connected with a plurality of voltage output ends in a one-to-one mode, the output ends of the first switch modules are connected with voltage detection nodes, and the control input ends of the first switch modules are used for being connected with a controller. The control signal is used for controlling the first switch module to be switched on; the second switch module comprises a switch and a resistor which are connected in series, and the control input end of the switch is used for being connected with the controller to receive a control signal for controlling the switch to be switched on; the voltage detection node and the second switch module are connected in series to form a series circuit, and a current detection node is preset on the series circuit; the current detection node is used for being connected in series with a current detector; and the voltage detection node is connected with the voltage input end of the voltage detector. According to the utility model, the voltage or current of the image signal generator can be flexibly calibrated through the switch module.

Description

Technical Field

[0001] This utility model relates to the field of parameter calibration technology, and more specifically to a multi-channel power supply calibration device and a multi-channel power supply calibration system. Background Technology

[0002] An image signal generator (pattern generator), also known as a video signal generator or test pattern generator, is an electronic device specifically designed to generate various standard and custom video or image signals. It is widely used in fields such as display inspection. Test patterns generated by an image signal generator can effectively locate dead pixels on a screen.

[0003] Calibrate image signal generators as a crucial step to ensure the accuracy and consistency of their output signals. Specifically, image signal generators are used to generate various types of image signals that must be highly accurate to ensure they can properly test the performance of display devices, cameras, or other vision systems. Therefore, how to better calibrate image signal generators is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] This utility model was proposed in view of the above problems. This utility model provides a multi-channel power supply calibration device and a multi-channel power supply calibration system.

[0005] According to one aspect of the present invention, a multi-channel power supply calibration device is provided, the device comprising multiple first switch modules, second switch modules, and voltage and current detectors, wherein...

[0006] Each of the multiple first switch modules has its input terminal connected to a multiple voltage output terminal, its output terminal connected to a voltage detection node, and its control input terminal connected to a controller to receive control signals that control the first switch module to turn on.

[0007] The second switch module includes a switch and a resistor connected in series. The control input terminal of the switch is used to connect to the controller to receive the control signal that controls the switch to turn on.

[0008] A voltage detection node and a second switch module are connected in series to form a series circuit, and a current detection node is preset on the series circuit;

[0009] The current sensing node is used to connect in series with a current detector;

[0010] The voltage sensing node is used to connect to the voltage input terminal of the voltage detector.

[0011] For example, the device includes a plurality of second switch modules connected in parallel, wherein,

[0012] The control input terminals of each switch in the multiple second switch modules are used to connect to the controller to receive control signals that control the switch to turn on.

[0013] For example, the resistors of different second switch modules have different resistance values.

[0014] For example, the voltage detector and the current detector are multimeters.

[0015] Exemplarily, the device further includes a conversion module, wherein,

[0016] The two-wire serial interface in the conversion module is connected to the control output terminal and the input terminal of the general-purpose input / output interface of the controller, respectively. The output terminal of the general-purpose input / output interface in the conversion module is connected to the control input terminal of each of the multiple first switch modules and the control input terminal of the second switch module, respectively.

[0017] According to another aspect of the present invention, a multi-channel power supply calibration system is provided for calibrating multiple power supplies of an image signal generator. The system includes the aforementioned multi-channel power supply calibration device and controller.

[0018] The controller is connected to the multi-channel power calibration device and the image signal generator respectively. The data input terminal of the controller is connected to the data output terminal of the voltage detector or the current detector. The control output terminal is connected to the control input terminal of multiple first switch modules and the control input terminal of the second switch module respectively. The data output terminal is connected to the data input terminal of the processing module of the image signal generator.

[0019] For example, the controller's control output terminal outputs a control signal to turn on any first switch module to the control input terminal of the first switch module, and outputs a control signal to turn off the second switch module to the second switch module. The voltage input terminal of the voltage detector receives the voltage output by the turned-on first switch module. The controller's data input terminal receives the actual voltage value output by the data output terminal of the voltage detector. The controller's data output terminal outputs the actual voltage value to the data input terminal of the processing module.

[0020] For example, the controller's control output terminal outputs a control signal to turn on any first switch module to the control input terminal of the first switch module, and outputs a control signal to turn on the second switch module to the control input terminal of the second switch module. The current input terminal of the current detector receives the current output by the turned-on second switch module. The controller's data input terminal receives the actual current value output by the current detector's data output terminal. The controller's data output terminal outputs the actual current value to the data input terminal of the processing module.

[0021] For example, the multi-channel power calibration device includes multiple second switch modules connected in parallel. The control input terminal of each switch in the multiple second switch modules is connected to the controller to receive the control signal for the control switch to be turned on. The control output terminal of the controller outputs a control signal for turning on any first switch module to the control input terminal of the first switch module, and outputs a control signal for selecting the second switch module to be turned on to the control input terminal of the second switch module. The current input terminal of the current detector receives the current output by the turned-on second switch module. The data input terminal of the controller receives the actual current value output by the data output terminal of the current detector. The data output terminal of the controller outputs the actual current value to the data input terminal of the processing module.

[0022] For example, the controller is a host computer, and the result output terminal of the image signal generator is connected to the result input terminal of the host computer to send the calibration result to the image signal generator; the host computer is used to display the received calibration result.

[0023] According to the above-mentioned solution provided by this utility model, the voltage and current of different voltage output terminals of the image signal generator can be detected through the cooperation of multiple first switch modules and second switch modules. Through these switch modules, the calibration parameters on the voltage output and sampling or current sampling lines inside the image signal generator can be flexibly calibrated, and mutual interference between different voltage output terminals during the calibration process can be reduced. Furthermore, this utility model has strong scalability and can be adapted to image signal generators with different numbers of voltage output terminals. Attached Figure Description

[0024] The above and other objects, features, and advantages of this utility model will become more apparent from the more detailed description of the embodiments thereof in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this utility model and form part of the specification. They are used together with the embodiments of this utility model to explain the utility model and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0025] Figure 1 A schematic block diagram of a multi-channel power supply calibration device according to an embodiment of the present invention is shown;

[0026] Figure 2 A schematic block diagram of a multi-channel power supply calibration device according to an embodiment of the present invention is shown;

[0027] Figure 3 A schematic block diagram of a conversion module according to an embodiment of the present invention is shown;

[0028] Figure 4A schematic block diagram of a multi-channel power supply calibration system according to an embodiment of the present invention is shown; and

[0029] Figure 5 A schematic block diagram of a power supply circuit for an image signal generator according to an embodiment of the present invention is shown. Detailed Implementation

[0030] In the following description, numerous details are provided to enable a thorough understanding of the present invention. However, those skilled in the art will appreciate that the following description merely illustrates preferred embodiments of the present invention, which may be practiced without one or more of these details. Furthermore, to avoid confusion with the present invention, some technical features well-known in the art have not been described in detail.

[0031] An image signal generator (PG) is a signal generation device that generates different image test signals in response to various commands, enabling the testing of display panels such as Liquid Crystal Displays (LCDs) and Organic Light-Emitting Diodes (OLEDs). The power module in the image signal generator generates multiple power signals to provide different power signals to the display panel under test (DUT). Each power signal can be generated by a separate power circuit and supplied to the load (DUT). During the testing of the DUT, the stability and accuracy of the power supply voltage provided by the power circuit must be ensured to guarantee the test results.

[0032] In related technologies, two multimeters and an electronic load machine are typically used to detect the voltage and current output of each power supply circuit, calculate the voltage difference between the detected voltage value and the theoretical output voltage value, and the current difference between the detected current value and the theoretical output current value, and calibrate the power supply circuit based on the voltage and current differences.

[0033] However, the above scheme requires a large number of devices, which increases the amount of preparation work needed for the power supply circuit calibration, and thus increases the complexity of the power supply circuit calibration process.

[0034] As can be seen from the above, the existing methods for calibrating power supply circuits suffer from problems such as a large amount of preparation work and high complexity.

[0035] To at least partially solve the above problems, this utility model provides a multi-channel power supply calibration device. Figure 1A schematic block diagram of a multi-channel power supply calibration device 100 according to one embodiment of the present invention is shown. Figure 1 As shown, the device includes multiple first switch modules 110 and second switch modules 120.

[0036] Each of the multiple first switch modules has its input terminal connected to a multiple voltage output terminal, its output terminal connected to a voltage detection node, and its control input terminal connected to a controller to receive control signals that control the first switch module to turn on.

[0037] The multi-channel power supply calibration device 100 may include multiple first switch modules 110. The input terminal of each first switch module 110 is connected to a voltage output terminal. For example, taking the multi-channel power supply calibration device 100 for calibrating the multi-channel power supply circuit of an image signal generator 200 as an example, when the multi-channel power supply circuit of the image signal generator 200 includes a main power supply (i.e., VDD power supply) circuit and a backlight power supply (i.e., VBL power supply) circuit, the voltage output terminal of the main power supply can be connected to the input terminal of the first switch module, and the voltage output terminal of the backlight power supply can be connected to the input terminal of another first switch module. Figure 1 In this diagram, D1 is a voltage detection node, and D2 is a current detection node. The output terminal of each first switch module 110 is connected to the voltage detection node D1. For example, each first switch module 110 has a first output terminal, and each first switch module 110 is connected to the voltage detection node D1 through the first output terminal.

[0038] The control input terminal of the first switch module 110 is connected to the controller 300. The controller 300 can control the first switch module 110 to conduct by outputting a control signal to its control input terminal. For example, the first switch module 110 can be a relay switch circuit. The controller 300 turns on the first switch module 110 by outputting a high-level signal to its control input terminal, thereby connecting the voltage output terminal connected to the input terminal of the first switch module 110 and the voltage detection node D1. When the controller 300 stops outputting a high-level signal to the control input terminal of the first switch module 110 or outputs a low-level signal to its control input terminal, the first switch module 110 is turned off, thereby disconnecting the circuit between the voltage output terminal connected to the first switch module 110 and the voltage detection node D1. For example, the first switch module 110 can be a single-pole double-throw relay switch circuit. Each first switch module 110 includes a first output terminal and a second output terminal. The first switch module 110 is connected to the voltage detection node through the first output terminal, and the first switch module 110 is connected to the second switch module 120 through the second output terminal. The controller 300 outputs a high-level signal to the control input terminal of the first switch module 110 to conduct the circuit between the voltage output terminal connected to the first switch module 110 and the first output terminal of the first switch module 110, thereby conducting the circuit between the voltage output terminal connected to the first switch module 110 and the voltage detection node D1. When the controller 300 stops outputting a high-level signal to the control input terminal of the first switch module 110 or outputs a low-level signal to the control input terminal of the first switch module 110, the circuit between the voltage output terminal connected to the first switch module 110 and the second output terminal of the first switch module 110 can be turned on, thereby disconnecting the circuit between the voltage output terminal connected to the first switch module 110 and the first output terminal of the first switch module 110. The above is merely an illustrative example and is not intended to limit the type of control signal or the first switch module 110.

[0039] The second switching module includes a switch and a resistor connected in series. The control input terminal of the switch is used to connect to the controller to receive the control signal that controls the switch to turn on.

[0040] The second switching module includes a switch 121 and a resistor 122. The control input terminal of switch 121 is connected to the controller 300. The controller 300 can control the conduction of switch 121 by outputting a control signal to the control input terminal of switch 121. For example, switch 121 can be a relay switch circuit. The controller 300 conducts the circuit between switch 121 and resistor 122 by outputting a high-level signal to the control input terminal of switch 121, thereby conducting the circuit between current detection node D2 and the output terminal of the second switching module 120. When the controller 300 stops outputting a high-level signal to the control input terminal of switch 121 or outputs a low-level signal to the control input terminal of switch 121, the circuit between switch 121 and resistor 122 is disconnected, thereby disconnecting the circuit between current detection node D2 and the output terminal of the second switching module 120. The above is merely an illustrative example and is not intended to limit the type of control signal or switch 121.

[0041] It is understood that if the first switch module 110 includes a first output terminal and a second output terminal, and the first switch module is a single-pole double-throw relay switch circuit, then when the controller outputs a control signal (e.g., the high-level signal mentioned above) to control the first switch module 110 to conduct the circuit between the voltage output terminal connected to the first switch module 110 and the voltage detection node D1, the controller 300 can output a control signal (e.g., the low-level signal mentioned above) to the control input terminal of switch 121, controlling switch 121 to be in the off state. When the controller 300 outputs a control signal (e.g., the low-level signal mentioned above) to control the first switch module 110 to conduct the circuit between the voltage output terminal connected to the first switch module 110 and the second output terminal of the first switch module 110, the controller can output a control signal (e.g., the high-level signal mentioned above) to the control input terminal of switch 121, controlling switch 121 to be in the on state, thereby conducting the circuit between the output terminal of the second switch module 120.

[0042] The input terminal of resistor 122 is connected to the output terminal of switch 121. A suitable resistor can be selected as resistor 122 based on the theoretical current. The magnitude of this theoretical current is set manually. For example, when checking whether the actual current output by the image signal generator 200 meets the standard, multiple currents can be set manually. Based on the set currents and the values ​​of the resistors in the circuit, the voltage that the image signal generator 200 needs to output is calculated. The controller 300 sends a voltage control signal to the image signal generator 200 so that the image signal generator 200 can output a voltage corresponding to the set current. This set current is the theoretical current mentioned above. If the error between the set current and the actual current is less than a preset error, it is determined that the actual current output by the image signal generator 200 meets the standard.

[0043] A voltage detection node D1 and a second switching module are connected in series to form a series circuit, on which a current detection node is pre-installed. The current detection node is used to connect in series with a current detector. For example, this current detection node can be located between the voltage detection node and the second switching module, or between the second switching module and the current detector. The voltage detection node is connected to the voltage input terminal of the voltage detector. The voltage detector and the current detector can be the same detector, such as a voltage-current detector 400. It should be understood that when only the first switching module is turned on, the voltage-current detector can be a voltage detector; when both the first and second switching modules are turned on, the voltage-current detector can be a current detector, which will not be elaborated further below.

[0044] Voltage detection node D1 is connected to the voltage input terminal of voltage and current detector 400. Voltage and current detector 400 can detect the voltage at voltage detection node D1 and generate the true voltage value. For example, when the first switch module is turned on, the voltage at voltage detection node D1 is equal to the voltage at the voltage output terminal connected to the turned-on first switch module. At this time, the voltage input terminal of voltage and current detector 400 receives the voltage output from the voltage output terminal and obtains the true voltage value of the true voltage by detecting this voltage. Specifically, for example, when the input terminal of the first switch module 110 and its first output terminal are turned on, the circuit between the voltage output terminal connected to the first switch module 110 and the voltage input terminal of voltage and current detector 400 is also in a conducting state, thereby enabling voltage and current detector 400 to obtain the true voltage value of the true voltage at the voltage output terminal.

[0045] Current detection node D2 is connected to the output terminal of the second switch module 120, and the output terminal of the second switch module 120 is connected to the current input terminal of the voltage-current detector 400. The voltage-current detector 400 can detect the current of current detection node D2 and generate the actual current value. For example, when the second switch module 120 is turned on, the current of current detection node D2 is equal to the current of the voltage output terminal connected to the turned second switch module 120. At this time, the current input terminal of the voltage-current detector 400 receives the current output by the voltage output terminal and obtains the actual current value by detecting this current. Specifically, for example, when the input terminal of the first switch module 110 is connected to its second output terminal, and the switch 121 in the second switch module 120 is turned on, the circuit between the voltage output terminal connected to the second switch module 120 and the current input terminal of the voltage-current detector 400 is also in a conducting state, so that the voltage-current detector 400 can obtain the actual current value of the actual current of the voltage output terminal.

[0046] Taking the voltage output of the main power supply (i.e., VDD power supply) circuit in the image signal generator 200 as an example, if the main power supply voltage range is 5V to 10V, at least two different voltages can be selected within this range as theoretical voltages. The magnitude of this theoretical voltage is set manually. For example, when detecting whether the actual voltage output by the image signal generator 200 meets the standard, multiple voltages can be set manually, and the set voltages can be used as the voltages that the image signal generator 200 needs to output. The controller 300 sends a voltage control signal to the image signal generator 200 so that the image signal generator 200 can output the actual voltage corresponding to the set voltage. Here, the set voltage is the theoretical voltage mentioned above. If the error between the set voltage and the actual voltage is less than a preset error, it is determined that the actual voltage output by the image signal generator 200 meets the standard. Taking a theoretical voltage of 5V as an example, the controller 300 outputs a voltage control signal to the image signal generator 200, which is used to instruct the main power supply circuit of the image signal generator 200 to output a voltage of 5V. The output terminal of the main power supply circuit outputs the actual voltage to the input terminal of the first switching module 110 connected to it. The control output terminal of the controller 300 outputs a control signal to control the first switching module 110 to conduct to the control input terminal of the first switching module 110 connected to the output terminal of the main power supply circuit, controlling the input terminal of the first switching module 110 to conduct with its first output terminal, thereby conducting the circuit between the main power supply circuit and the voltage detection node, so that the voltage and current detector 400 can detect the actual voltage at the output terminal of the main power supply circuit.

[0047] According to the above-mentioned solution provided by this utility model, the voltage and current of different voltage output terminals of the image signal generator can be detected through the cooperation of multiple first switch modules and second switch modules. Through these switch modules, the calibration parameters on the voltage output and sampling or current sampling lines inside the image signal generator can be flexibly calibrated, and mutual interference between different voltage output terminals during the calibration process can be reduced. Furthermore, this utility model has strong scalability and can be adapted to image signal generators with different numbers of voltage output terminals.

[0048] For example, the device includes a plurality of second switch modules connected in parallel, wherein the control input terminal of each switch in the plurality of second switch modules is used to connect to the controller to receive a control signal to control the switch to turn on.

[0049] See Figure 2 As shown, Figure 2 A schematic block diagram of a multi-channel power supply calibration device according to an embodiment of the present invention is shown.

[0050] When the second switch module 120 needs to be turned on, the controller 300 outputs a control signal to turn on the switch to the control input terminal of the switch 121 in the second switch module 120. When the switch 121 in the second switch module 120 receives the control signal to turn on the switch, it turns on the circuit between the current detection node D2 and the current input terminal of the voltage and current detector 400, so that the voltage and current detector can obtain the current in the circuit.

[0051] According to the above-mentioned solution provided by this utility model, multiple parallel second switch modules can be set in the device. The controller controls the on / off state of the switches in each second switch module. Even if one second switch module fails, the controller can activate the switches in another second switch module, ensuring the device can operate normally without being affected by the faulty second switch module, thereby improving the stability of the multi-channel power supply calibration device. Furthermore, by adjusting the number of switches activated in the multiple second switch modules, the resistance value in the circuit can be controlled, enabling the voltage and current detectors to detect multiple theoretical currents corresponding to actual currents, thereby increasing the detection data and ensuring the reliability of the final image signal generator calibration results.

[0052] For example, the resistors of different second switching modules have different resistance values.

[0053] For example, the resistance values ​​of resistor 122 in different second switch modules 120 can be 2,000,000 ohms, 10,000 ohms, 1,000 ohms, 100 ohms, and 1 ohm, respectively. For example, when the set current (i.e., the theoretical current mentioned above) is 0.005 mA, the controller 300 outputs a control signal to turn on switch 121 in the second switch module 120. The control input terminal of switch 121 receives the control signal, thereby turning on switch 121 in the second switch module 120 with a resistance value of 2,000,000 ohms between the current detection node D2 and resistor 122, connecting resistor 122 to the circuit. Specifically, for example, taking the current output from the main power supply (i.e., VDD power supply) circuit in the calibration image signal generator 200 as an example, if the main power supply current range is 0.0005 mA to 0.01 mA, at least two different currents can be selected as theoretical currents within this range. The theoretical currents can be found in the description above and will not be repeated here. The corresponding resistance value can be selected according to the above current range, and then a theoretical current value can be selected within this current range. For example, the current range can be from 0.005mA to 0.01mA, allowing the switch connected to a resistor with a resistance of 2,000,000 ohms to be turned on, and then a theoretical current with a current magnitude within the above current range can be used. It should be understood that different theoretical current magnitudes can also be selected sequentially within this current range to calibrate the image signal generator. According to Ohm's law, a voltage of 1V is required from the output of the main power supply circuit to ensure that the current in the circuit is 0.0005mA. The controller 300 outputs a voltage control signal to the image signal generator 200, which is used to instruct the main power supply circuit of the image signal generator 200 to output a voltage of 1V. The output of the main power supply circuit outputs a voltage of 1V to the input of the first switching module 110 connected to it. The controller 300 outputs a control signal to the control input of the second switch module 120, which corresponds to the resistor 122 with a resistance of 2,000,000 ohms, thereby controlling the second switch module 120 to conduct the circuit between the current detection node and the voltage and current detector 400. Furthermore, the controller 300 outputs a control signal to the control input of the first switch module 110, which is connected to the output of the main power supply circuit, thereby conducting the circuit between the main power supply circuit and the current detection node, enabling the voltage and current detector 400 to detect the current at the output of the main power supply circuit.

[0054] The controller 300 can simultaneously output a control signal to turn on at least one control switch to the control input terminal of the corresponding switch 121 in the plurality of second switch modules 120. For example, when a resistor with a resistance of 30,000 ohms needs to be connected to the circuit, the controller 300 can output a control signal to turn on a control switch to the control input terminal of the switch 121 connected to the resistor 122 with a resistance of 20,000 ohms, thereby controlling the switch 121 to turn on. If there is no resistor with a resistance of 30,000 ohms in the plurality of second switch modules 120, the controller 300 can output multiple control signals to turn on multiple control switches to the control input terminals of multiple switches 121. For example, if there are resistors 122 with a resistance of 40,000 ohms and resistors 122 with a resistance of 120,000 ohms in the multiple second switch modules 120, then the controller 300 can output a control signal to turn on the switch to the control input terminal of the switch 121 connected to the resistor 122 with a resistance of 40,000 ohms, and output a control signal to turn on the switch to the control input terminal of the switch 121 connected to the resistor 122 with a resistance of 120,000 ohms, so that the resistance of the resistor connected to the circuit is 30,000 ohms.

[0055] According to the above-described solution provided by this utility model, the resistance values ​​of different second switch modules can be made different. This allows the switches in the corresponding second switch modules to be activated based on the theoretical current, connecting the resistors with resistance values ​​corresponding to the theoretical current into the circuit. This enables calibration based on the theoretical current value and the actual current value, thus increasing the applicability of the multi-channel power supply calibration device. Furthermore, by adjusting the number of switches activated in the multiple second switch modules, the resistance values ​​in the circuit can be controlled, allowing the voltage and current detectors to detect the actual currents corresponding to multiple theoretical currents, thereby ensuring the reliability of the final calibration results for the image signal generator.

[0056] For example, the voltage detector and the current detector are multimeters.

[0057] When the multi-channel power supply calibration device 100 calibrates the voltage output of the image signal generator, the multimeter operates in voltage detector mode to detect the voltage value at its voltage input terminal, i.e., the voltage value at the voltage detection node. When the multi-channel power supply calibration device 100 calibrates the current output of the image signal generator, the multimeter operates in current detector mode to detect the current value at its current input terminal, i.e., the current value at the current detection node.

[0058] For example, the device further includes a conversion module, wherein the two-wire serial interface in the conversion module is connected to the control output terminal of the controller and the input terminal of the general-purpose input / output interface, respectively, and the output terminal of the general-purpose input / output interface in the conversion module 140 is connected to the control input terminal of each of the plurality of first switch modules and the control input terminal of the second switch module, respectively.

[0059] See Figure 3 As shown, Figure 3 A schematic block diagram of a conversion module 140 according to an embodiment of the present invention is shown. When it is necessary to connect the circuit between the power supply circuit being calibrated and the voltage detection node, it is necessary to control the input terminal and the first output terminal of the first switching module 110 connected to the power supply circuit being calibrated to be connected. At this time, the control output terminal of the controller 300 outputs a control signal to control the first switching module 110 to be connected to the input terminal of the two-wire serial interface 141. The two-wire serial interface 141 generates and outputs a serial signal to the input terminal of the general-purpose input / output interface 142 according to the control signal output by the controller 300. The general-purpose input / output interface 142 generates and outputs a control signal through its output terminal to the control input terminal of the first switching module 110 connected to the power supply circuit being calibrated, thereby controlling the input terminal and the first output terminal of the first switching module 110 to be connected. When it is necessary to activate the circuit between the power supply circuit being calibrated and the current detection node, it is necessary to control the input terminal and second output terminal of the first switching module 110 connected to the power supply circuit being calibrated, as well as the switch 121 in the corresponding second switching module 120, to be activated. At this time, the control output terminal of the controller 300 outputs a control signal to the input terminal of the two-wire serial interface 141 to control the activation of the first switching module 110. The two-wire serial interface 141 generates and outputs a serial signal to the input terminal of the general-purpose input / output interface 142 based on the control signal output by the controller 300. The general-purpose input / output interface 142 generates and outputs a control signal to the control input terminal of the first switching module 110 connected to the power supply circuit being calibrated, thereby activating the input terminal and second output terminal of the first switching module 110. Furthermore, the control output terminal of the controller 300 outputs a control signal to the input terminal of the two-wire serial interface 141 to control the activation of the switches. The two-wire serial interface 141 generates and outputs a serial signal to the input terminal of the general-purpose input / output interface 142 based on the control signal that turns on the control switch. The general-purpose input / output interface 142 then generates and outputs a control signal to the control input terminal of the corresponding switch 121 in the second switch module based on the serial signal, thereby turning on the switch 121.

[0060] According to the above-mentioned solution provided by this utility model, the controller can control the conduction of the first switch module through the conversion module, which is conducive to realizing an automated control process.

[0061] This utility model embodiment also provides a multi-channel power supply calibration system for calibrating multiple power supplies of an image signal generator. See also... Figure 4 As shown, Figure 4 A schematic block diagram of a multi-channel power supply calibration system according to an embodiment of the present invention is shown. Figure 4 As shown, the system includes the multi-channel power calibration device 100 and the controller 300 mentioned above. The controller 300 is connected to the multi-channel power calibration device 100 and the image signal generator 200, respectively. The data input terminal of the controller 300 is connected to the data output terminal of the voltage detector or current detector (refer to the voltage and current detector 400 in the figure), the control output terminal is connected to the control input terminals of multiple first switch modules 110 and the control input terminal of the second switch module 120, respectively, and the data output terminal is connected to the data input terminal of the processing module 210 of the image signal generator 200.

[0062] See Figure 4As shown, taking the voltage output of the main power supply (i.e., VDD power supply) circuit in the image signal generator 200 as an example, if the main power supply voltage range is 5V to 10V, at least two different voltages within this range are selected as theoretical voltages. The magnitude of this theoretical voltage is set manually. For example, when checking whether the actual voltage output by the image signal generator 200 meets the standard, multiple voltages can be set manually, and the set voltages are used as the voltages that the image signal generator 200 needs to output. The controller 300 sends a voltage control signal to the image signal generator 200 so that the image signal generator 200 can output a voltage corresponding to the set voltage. Here, the set voltage is the theoretical voltage mentioned above. If the error between the set voltage and the actual voltage is less than a preset error, it is determined that the actual voltage output by the image signal generator 200 meets the standard. Taking a theoretical voltage of 5V as an example, the controller 300 outputs a voltage control signal to the image signal generator 200, which is used to instruct the main power supply circuit of the image signal generator 200 to output a voltage of 5V. The main power supply circuit outputs the actual voltage to the input of the first switching module 110 connected to it. The controller 300 outputs a control signal to the control input of the first switching module 110 connected to the output of the main power supply circuit, controlling the input of the first switching module 110 to conduct with its first output, thereby connecting the circuit between the main power supply circuit and the voltage detection node, enabling the voltage and current detector 400 to detect the voltage at the output of the main power supply circuit. The voltage and current detector 400 checks the voltage at the output of the first switching module 110 (i.e., the voltage detection node D1 mentioned above) and outputs the voltage detection result (i.e., the actual voltage value mentioned above) to the data input of the controller 300 through the data output of the voltage and current detector 400. The controller 300 can output the theoretical voltage and the received voltage detection result to the data input of the processing module 210 of the image signal generator 200 through the data output. The processing module 210 of the image signal generator 200 calculates a calibration value based on the theoretical voltage and the voltage detection results. It then adjusts the parameters of each module in the main power supply circuit according to the calibration value to reduce the difference between the adjusted output voltage of the main power supply circuit and the theoretical voltage. The above is merely an illustrative example; alternatively, the controller 300 can calculate the calibration value and send it to the image signal generator 200, which then adjusts the parameters of each module in the main power supply circuit based on the calibration value.

[0063] Taking the output current of the main power supply (i.e., VDD power supply) circuit in the calibration image signal generator 200 as an example, if the main power supply current ranges from 0.0005 mA to 0.01 mA, at least two different currents within this range are selected as the theoretical current. The theoretical current can be found in the previous description and will not be repeated here. Taking a theoretical current of 0.0005 mA as an example, a switch connected to a resistor with a resistance of 2000000 ohms can be turned on. According to Ohm's law, a 1V voltage is required from the output of the main power supply circuit to ensure a current of 0.0005 mA in the circuit. The controller 300 outputs a voltage control signal to the image signal generator 200, which instructs the main power supply circuit of the image signal generator 200 to output a 1V voltage. The output of the main power supply circuit outputs a 1V voltage to the input of the first switching module 110 connected to it. The controller 300 outputs a control signal to the control input of the second switch module 120, which corresponds to the resistor 122 with a resistance of 2,000,000 ohms, to control the second switch module 120 to conduct the circuit between the current detection node and the voltage-current detector 400. Simultaneously, the controller 300 outputs a control signal to the control input of the first switch module 110, which is connected to the output of the main power supply circuit, to control the input of the first switch module 110 to conduct its second output, thereby conducting the circuit between the main power supply circuit and the current detection node. This allows the voltage-current detector 400 to detect the current at the output of the main power supply circuit. The voltage-current detector 400 detects the current at the output of the second switch module 120 (equivalent to the current detection node D2 mentioned above) and outputs the current detection result (i.e., the actual current value mentioned above) to the data input of the controller 300 via its data output. The controller 300 can output the theoretical current and the received current detection result to the data input terminal of the processing module 210 of the image signal generator 200 via its data output terminal. The processing module 210 of the image signal generator 200 calculates a calibration value based on the theoretical current and the current detection result, and adjusts the parameters of each module in the main power supply circuit according to the calibration value to reduce the difference between the current output by the adjusted main power supply circuit and the theoretical current. The above is only an illustrative example; alternatively, the controller 300 can calculate the calibration value and send it to the image signal generator 200, which then adjusts the parameters of each module in the main power supply circuit according to the calibration value to reduce the difference between the current output by the adjusted main power supply circuit and the theoretical current.

[0064] In one example, see Figure 5 As shown, Figure 5A schematic block diagram of a power supply circuit 220 for an image signal generator according to an embodiment of the present invention is shown. Each power supply circuit 220 of the image signal generator 200 may include a digital-to-analog converter 221, a sampling resistor 222, a current sampling module 223, and a voltage sampling module 224. The data input terminal of the processing module 210 mentioned above is connected to the data output terminal of the controller 300, the sampling data output terminal of the current sampling module 223, and the sampling data output terminal of the voltage sampling module 224. The input terminal of the digital-to-analog converter 221 is connected to the data output terminal of the controller 300 and the processing module 210, and its output terminal is connected to the first terminal of the sampling resistor 222 and the positive input terminal of the current sampling module 223. The sampling resistor 222 is connected in parallel with the current sampling module 223, and the second terminal of the sampling resistor 222 is connected to the negative input terminal of the current sampling module and the input terminal of the voltage sampling module 224. The second terminal of the sampling resistor 222 is the output terminal of the power supply circuit 220. The digital-to-analog converter 221 can output a voltage to the sampling resistor 222 according to the voltage control signal output by the controller 300. The current sampling module 223 can sample the current flowing through the sampling resistor 222 to obtain the sampled current. The voltage sampling module 224 can sample the voltage of the sampling resistor 222 to obtain the sampled voltage. When calibrating the voltage at the output terminal of the power supply circuit 220, the data input terminal of the processing module 210 can receive the actual voltage value, the theoretical voltage value, and the sampled voltage value output by the data output terminal of the controller 300. The processing module 210 can calculate the calibration value based on the actual voltage value, the theoretical voltage value, and the sampled voltage value, and send the calibration value to the digital-to-analog converter 221 to adjust the parameters in the digital-to-analog converter 221, for example, the gain value in the digital-to-analog converter 221. When calibrating the current at the output terminal of the power supply circuit 220, the data input terminal of the processing module 210 can receive the actual current value, the theoretical current value, and the sampled current value output by the data output terminal of the controller 300, as well as the sampled current value output by the data output terminal of the current sampling module 223. The processing module 210 can calculate a calibration value based on the actual current value, the theoretical current value, and the sampled current value, and send this calibration value to the digital-to-analog converter 221 to adjust the parameters in the digital-to-analog converter 221. For example, this parameter can be the gain value in the digital-to-analog converter 221. It should be noted that the above-described adjustment of the parameters in the digital-to-analog converter based on the calibration value is merely exemplary and not intended to limit the present invention. The parameters of other circuit components in the circuit can also be adjusted based on the calibration value.

[0065] In one example, when calibrating the current at the output of the power supply circuit 220, the controller 300 can send a calculation formula adapted to the theoretical current to the data input of the processing module 210 through the data output, so as to instruct the processing module 210 to calculate the calibration value according to the formula.

[0066] In another example, the processing module 210 internally stores calculation formulas corresponding to different theoretical currents. When the controller 300 sends the actual current value, the theoretical current value, and the sampled current value to the data input terminal of the processing module 210 through the data output terminal, the processing module selects a calculation formula that matches the theoretical current value and calculates the calibration value.

[0067] According to the above-described solution provided by this utility model, the voltages at different voltage output terminals of the image signal generator can be detected through multiple first switch modules, and the currents at different voltage output terminals of the image signal generator can be detected through a second switch module. These switch modules allow for flexible calibration of the voltage or current of the image signal generator and reduce mutual interference between different voltage output terminals during the calibration process. Furthermore, this utility model has strong scalability and can be adapted to image signal generators with varying numbers of voltage output terminals.

[0068] For example, the controller's control output terminal outputs a control signal to turn on any first switch module to the control input terminal of the first switch module, and outputs a control signal to turn off the second switch module to the second switch module. The voltage input terminal of the voltage detector receives the voltage output by the turned-on first switch module. The controller's data input terminal receives the actual voltage value output by the data output terminal of the voltage detector. The controller's data output terminal outputs the actual voltage value to the data input terminal of the processing module.

[0069] Combination Figure 4When the power supply circuit to be calibrated is the output voltage of the main power supply circuit of the image signal generator 200, the controller 300 outputs a control signal to turn on any of the first switch modules 110 to the control input of the first switch module 110 connected to the main power supply circuit. This turns on the circuit between the input and output of the first switch module 110, allowing the first switch module 110 to turn on the circuit between the output of the main power supply circuit and the voltage detection node, and further turning on the circuit between the output of the main power supply circuit and the voltage input of the voltage and current detector 400. Simultaneously, the controller 300 outputs a control signal to turn off the second switch module 120 to the control input of the second switch module 120. At this time, the voltage and current detector 400 detects the voltage at the output of the main power supply circuit, obtaining the voltage detection result, i.e., the true voltage value mentioned above. The voltage and current detector 400 outputs the true voltage value to the data input of the controller 300 through its data output terminal. The controller 300 then outputs the true voltage value to the data input of the processing module 210 through its data output terminal.

[0070] For example, the controller's control output terminal outputs a control signal to turn on any first switch module to the control input terminal of the first switch module, and outputs a control signal to turn on the second switch module to the control input terminal of the second switch module. The current input terminal of the current detector receives the current output by the turned-on second switch module. The controller's data input terminal receives the actual current value output by the current detector's data output terminal. The controller's data output terminal outputs the actual current value to the data input terminal of the processing module.

[0071] Combination Figure 4When the power supply circuit to be calibrated is the output current of the main power supply circuit of the image signal generator 200, the controller 300 outputs a control signal to activate any of the first switch modules 110 to the control input of the first switch module 110 connected to the main power supply circuit. This activates the circuit between the input and second output of the first switch module 110, allowing the first switch module 110 to activate the circuit between the output of the main power supply circuit and the current detection node. Furthermore, the controller 300 outputs a control signal to activate the second switch module 120 to the control input of the second switch module 120, activating the circuit between the current detection node and the current input of the voltage and current detector, thereby activating the circuit between the output of the main power supply circuit and the current input of the voltage and current detector. At this time, the voltage and current detector 400 detects the current at the output of the main power supply circuit, obtaining the current detection result, i.e., the actual current value mentioned above. The voltage and current detector 400 outputs the actual current value to the data input of the controller 300 through its data output terminal. The controller 300 outputs the actual current value to the data input terminal of the processing module 210 through its data output terminal. It can be understood that the control signal for turning on the second switch module 120 mentioned above can be either the control signal for turning on the second switch module mentioned earlier, or the control signal for turning on the switch mentioned earlier. The control input terminal of the second switch module can be the control input terminal of the switch in the second switch module mentioned above.

[0072] For example, the multi-channel power calibration device includes multiple second switch modules connected in parallel. The control input terminal of each switch in the multiple second switch modules is connected to a controller to receive a control signal to turn on the switch. The controller's control output terminal outputs a control signal to turn on any first switch module to the control input terminal of the first switch module, and outputs a control signal to select which of the multiple second switch modules to turn on to the control input terminal of the second switch module. The current input terminal of the current detector receives the current output by the turned-on second switch module. The controller's data input terminal receives the actual current value output by the current detector's data output terminal, and the controller's data output terminal outputs the actual current value to the data input terminal of the processing module.

[0073] Combination Figure 4When the power supply circuit to be calibrated is the main power supply circuit of the image signal generator 200, the controller 300 outputs a control signal to activate any first switch module 110 to the control input of the first switch module 110 connected to the main power supply circuit. This activates the circuit between the input and second output of the first switch module 110, ensuring that the first switch module 110 can activate the circuit between the output of the main power supply circuit and the inputs of multiple second switch modules 120, i.e., the circuit between the output of the power supply circuit and the current detection node. Furthermore, the second switch module 120 that needs to be activated can be determined according to the actual situation (e.g., based on the relationship between current and resistance). The controller 300 outputs a control signal to activate the second switch module 120 to the control input of the second switch module 120 that needs to be activated. At this time, the voltage and current detector 400 detects the current at the output of the activated second switch module 120 (equivalent to the current at the output of the main power supply circuit) to obtain the current detection result, i.e., the true current value. The voltage and current detector 400 outputs the actual current value to the data input terminal of the controller 300 through its data output terminal. The controller 300 outputs the actual current value to the data input terminal of the processing module 210 through its data output terminal. It can be understood that the control input terminal of the second switch module can be the control input terminal of the switch in the second switch module mentioned above, and the control signal for turning on the second switch module 120 mentioned above can be the control signal for turning on the second switch module mentioned earlier, or it can be the control signal for turning on the switch mentioned earlier. The resistance values ​​of different second switch modules can be different.

[0074] According to the above-mentioned solution provided by this utility model, multiple parallel second switch modules can be set in the device. The controller controls the on / off state of the switches in each second switch module. Even if one second switch module fails, the controller can activate the switch in another second switch module, ensuring the device can operate normally without being affected by the faulty second switch module, thus improving the stability of the multi-channel power supply calibration device. Furthermore, by adjusting the number of switches activated in the multiple second switch modules, the resistance value in the circuit can be controlled, allowing the voltage and current detectors to detect multiple theoretical currents corresponding to the actual currents, thereby increasing the detection data and ensuring the reliability of the final image signal generator calibration results. In addition, by making the resistance values ​​of different second switch modules different, the corresponding switches in the second switch modules are activated according to the theoretical current (i.e., the current set above). Resistors with resistance values ​​matching the theoretical current are connected to the circuit, allowing calibration based on the theoretical current value and the actual current value, which helps to increase the applicability of the multi-channel power supply calibration device.

[0075] For example, the controller is a host computer, and the output terminal of the image signal generator is connected to the input terminal of the host computer to send the calibration results to the image signal generator. The host computer is used to display the received calibration results.

[0076] The image signal generator can send calibration results to the host computer's input terminal via its output terminal. For example, if the processing module determines that the difference between the actual current value and the theoretical current value is greater than its internally set preset difference threshold, it sends a calibration result indicating "Flat" (e.g., garbled text, 0, etc.) to the host computer. If the processing module determines that the difference between the actual current value and the theoretical current value is not greater than its internally set preset difference threshold, it sends a calibration result indicating "True" (e.g., the sampled current value, 1, etc. mentioned above) to the host computer. In this case, the host computer can display the calibration results sent by the image signal generator on its display interface. As another example, the host computer can generate a calibration information table based on the sampled current value, the actual current value, the theoretical current value, and the sampling results, and display this table on its display interface. The host computer can be connected to the image signal generator via a network cable and to the voltage and current detector via a USB cable. The host computer can be an electronic device with a display interface and data processing capabilities.

[0077] According to the above-mentioned solution provided by this utility model, the calibration result can be received by the host computer. If the calibration result is abnormal, the image signal generator can be recalibrated, or the user can manually adjust the image signal generator, which is beneficial to adapting to different application scenarios.

[0078] In the description of this utility model, it should be understood that the directional terms such as "front", "rear", "up", "down", "left", "right", "horizontal", "vertical", "horizontal", "top", and "bottom" indicate the orientation or positional relationship, which are usually based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0079] For ease of description, relative terms such as "above," "over," "on the upper surface of," and "above" are used here to describe the regional positional relationship of one or more components or features shown in the figures to other components or features. It should be understood that relative terms include not only the orientation of the component as depicted in the figure but also different orientations during use or operation. For example, if the components in the figures are inverted as a whole, "above" or "above other components or features" will include cases where the component is "below" or "under" other components or features. Thus, the exemplary term "above" can include both "above" and "below." Furthermore, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this document intends to include all such cases.

[0080] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, parts, components, and / or combinations thereof.

[0081] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in orders other than those illustrated or described herein. This utility model has been described through the above embodiments, but it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this utility model to the scope of the described embodiments. Furthermore, those skilled in the art will understand that this utility model is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this utility model, all of which fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A multi-channel power supply calibration device, characterized in that, The device includes multiple first switch modules and second switch modules, wherein, Each of the multiple first switch modules has its input terminal connected to a multiple voltage output terminal, its output terminal connected to a voltage detection node, and its control input terminal connected to a controller to receive control signals that control the first switch module to turn on. The second switch module includes a switch and a resistor connected in series. The control input terminal of the switch is used to connect to the controller to receive a control signal that controls the switch to turn on. The voltage detection node and the second switch module are connected in series to form a series circuit, and a current detection node is preset on the series circuit; The current detection node is used to connect in series with the current detector; The voltage detection node is used to connect to the voltage input terminal of the voltage detector.

2. The apparatus as claimed in claim 1, characterized in that, The device includes multiple second switch modules connected in parallel, wherein, The control input terminals of each switch in the plurality of second switch modules are used to connect to the controller to receive the control signal for the control switch to be turned on.

3. The apparatus as described in claim 2, characterized in that, The resistors of different second switch modules have different resistance values.

4. The apparatus as claimed in claim 1, characterized in that, The voltage detector and current detector are multimeters.

5. The apparatus as claimed in claim 1, characterized in that, The device further includes a conversion module, wherein... The two-wire serial interface in the conversion module is connected to the control output terminal and the input terminal of the general-purpose input / output interface of the controller, respectively. The output terminal of the general-purpose input / output interface in the conversion module is connected to the control input terminal of each of the plurality of first switch modules and the control input terminal of the second switch module, respectively.

6. A multi-channel power supply calibration system for calibrating multiple power supplies of an image signal generator, characterized in that, The system includes the multi-channel power calibration device, detector, and controller as described in claim 1; The controller is connected to the multi-channel power calibration device and the image signal generator respectively. The data input terminal of the controller is connected to the data output terminal of the voltage detector or the current detector. The control output terminal is connected to the control input terminal of the multiple first switch modules and the control input terminal of the second switch module respectively. The data output terminal is connected to the data input terminal of the processing module of the image signal generator.

7. The system as described in claim 6, characterized in that, The controller outputs a control signal to turn on any first switch module and sends it to the control input of that first switch module. It also outputs a control signal to turn off the second switch module and sends it to the second switch module. The voltage input of the voltage detector receives the voltage output by the first switch module that is turned on. The data input of the controller receives the actual voltage value output by the data output of the voltage detector. The data output of the controller outputs the actual voltage value to the data input of the processing module.

8. The system as described in claim 6, characterized in that, The controller outputs a control signal to turn on any first switch module to the control input of that first switch module, and outputs a control signal to turn on the second switch module to the control input of that second switch module. The current input of the current detector receives the current output by the turned-on second switch module. The data input of the controller receives the actual current value output by the data output of the current detector. The data output of the controller outputs the actual current value to the data input of the processing module.

9. The system as described in claim 6, characterized in that, The multi-channel power calibration device includes multiple parallel second switch modules. The control input terminal of each switch in the multiple second switch modules is used to connect to the controller to receive the control signal of the control switch being turned on. The controller's control output terminal outputs a control signal to the control input terminal of the first switch module to control any one of the first switch modules to conduct, and outputs a control signal to the control input terminal of the second switch module to select which of the multiple second switch modules to conduct. The current input terminal of the current detector receives the current output by the conducted second switch module. The controller's data input terminal receives the actual current value output by the data output terminal of the current detector. The controller's data output terminal outputs the actual current value to the data input terminal of the processing module.

10. The system as described in claim 9, characterized in that, The controller is a host computer, and the output terminal of the image signal generator is connected to the input terminal of the host computer to send the calibration result to the image signal generator; the host computer is used to display the received calibration result.

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