Detection and calibration device for voltage and current

Abstract

The utility model discloses a voltage and current detection and calibration device, which comprises a detected voltage and current, a controllable direct-current power supply and an MCU control unit, the controllable direct-current power supply is electrically connected with the MCU control unit, a digital bridge and the detected voltage and current and is used for providing stable and adjustable current and voltage for the MCU control unit, the digital bridge and the detected voltage and current, and the MCU control unit is electrically connected with the detected voltage and current and is used for providing stable and adjustable current and voltage for the detected voltage and current. The MCU is electrically connected with the detected voltage and current and used for controlling and setting a calibration detection mode of the detected voltage and current, the MCU is electrically connected with the detected voltage and current through an electronic load and a digital bridge, the electronic load detects the performance of the detected voltage and current under different load conditions, and the digital bridge detects data values of the detected voltage and current. The voltage and current detection and calibration device can integrate voltage detection and calibration and current detection and calibration, effectively improves the efficiency of voltage and current calibration and detection, and improves the production utilization rate.

Description

Technical Field

[0001] This utility model relates to the technical field of electronic device testing, specifically to a voltage and current testing and calibration device. Background Technology

[0002] Voltage, also known as potential difference, is a physical quantity that measures the energy difference per unit charge in an electrostatic field due to the difference in potential. Current is the directional movement of charged particles, defined as the amount of charge flowing per unit time. Voltage and current calibration refers to adjusting the accuracy of voltage and current devices through a series of steps to ensure that the readings match the actual measured values. Calibration ensures the accuracy of voltage and current readings, thereby guaranteeing the precision of measurement data and the stability of equipment operation.

[0003] With the development of technology, electronic devices, after mass production, often face the problem of excessively large amounts of voltage and current data requiring calibration, which poses a significant burden on testing personnel. However, excessive data can easily lead to oversights, reducing production efficiency. Currently, most testing and calibration processes on the market rely on multimeters or communication devices such as RS485 and CAN, which requires a significant amount of time for most companies. Therefore, there is an urgent need for a low-cost and convenient voltage and current detection and calibration device. Utility Model Content

[0004] The summary section of this utility model is intended to briefly introduce the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0005] To address the problems and shortcomings of existing technologies, this invention provides a voltage and current detection and calibration device. It electrically connects a controllable DC power supply to an MCU control unit, a digital bridge, and the voltage and current to be measured, providing them with stable and adjustable current and voltage. Furthermore, the MCU control unit connects to the controllable DC power supply, the digital bridge, the voltage and current to be measured, and an electronic load, enabling the selection of the operating mode for voltage and current detection and calibration. This solves the problems mentioned in the background section.

[0006] To achieve the above objectives, this utility model provides the following technical solution: It includes a measured voltage and current, a controllable DC power supply, and an MCU control unit. The controllable DC power supply is electrically connected to the MCU control unit, a digital bridge, and the measured voltage and current, providing them with stable and adjustable current and voltage. The MCU control unit is electrically connected to the measured voltage and current, controlling and setting the calibration detection mode of the measured voltage and current. The MCU control unit is also electrically connected to the measured voltage and current through an electronic load and a digital bridge. The electronic load detects the performance of the measured voltage and current under different load conditions, and the digital bridge detects the data value of the measured voltage and current.

[0007] Preferably, the measured voltage and current can be set to multiple values, and these multiple measured voltage and current values ​​are connected in parallel. During detection and calibration, multiple measured voltage and current values ​​can be set, and these multiple measured voltage and current values ​​are connected in parallel, thus enabling simultaneous detection and calibration of multiple measured voltage and current values.

[0008] Preferably, a DC relay is provided between the controllable DC power supply, the digital bridge, the electronic load, and the MCU control unit. The DC relay serves as an automatic adjustment, safety protection, and circuit switching mechanism. When the MCU control unit controls the connected controllable DC power supply, digital bridge, and electronic load, the DC relay can be used in conjunction with these components to provide adjustment and protection within the circuit.

[0009] Preferably, a DC relay is also provided between the measured voltage / current and the MCU control unit. When the MCU control unit is connected to the measured voltage / current and is operating, the measured voltage / current of the corresponding line can be turned on through the DC relay, so that the calibration of the measured voltage / current between multiple lines is not affected by each other.

[0010] Preferably, the MCU control unit is electrically connected to the touch screen via an RS232 interface. In use, the touch screen can not only display the current measured voltage and current data values, providing a basis for users to set the output voltage, output current, and operating status of the controllable DC power supply, but also set the mode for measuring voltage and current detection and calibration.

[0011] Preferably, the MCU control unit is electrically connected to the controllable DC power supply and the digital bridge via an RS485 interface. Using the RS485 interface for data transmission offers advantages such as high transmission rate, strong anti-interference and noise capability, and long transmission distance. Therefore, the RS485 interface enables more efficient communication and transmission between the MCU control unit, the controllable DC power supply, and the digital bridge.

[0012] Preferably, the MCU control unit is an STM32G030C8T6 chip. The STM32G030C8T6 is a 32-bit MCU microcontroller, based on high performance... The STM32G030C8T6 features a 32-bit RISC core (M0+) capable of operating at frequencies up to 64MHz. It incorporates multiple serial communication interfaces for data transmission and control with external devices. Its numerous GPIO pins can be used to connect various external devices and sensors, support multiple low-power modes, and provide comprehensive development tools and software support.

[0013] Preferably, the touchscreen is an MT8050IE human-machine interface. The MT8050iE is a Weintek brand human-machine interface product, widely used in various industrial control systems, and is favored for its stable performance and excellent user experience. The MT8050iE features a fanless cooling system, IP65 panel protection rating, and motherboard coating to prevent environmental corrosion, enabling it to operate normally and stably even in harsh environments.

[0014] Preferably, the digital bridge is the UT612 handheld LCR digital bridge. The UT612 is a stable, safe, and reliable handheld autorange LCR digital bridge specifically designed for measuring inductance, capacitance, and resistance. It features low power consumption, high measurement accuracy, and high speed. Its handheld design makes it more portable and suitable for use in various environments.

[0015] Compared with the prior art, the beneficial effects provided by this utility model are:

[0016] This utility model discloses a voltage and current detection and calibration device that integrates voltage and current detection and calibration, effectively improving the efficiency of voltage and current calibration and detection. It includes a controllable DC power supply, a digital bridge, an MCU control unit, and an electronic load. The controllable DC power supply is electrically connected to the MCU control unit, the digital bridge, and the voltage and current being measured, providing them with stable and adjustable current and voltage. The MCU control unit is electrically connected to the voltage and current being measured and is used to control and set the calibration and detection mode of the measured voltage and current. The MCU control unit is also electrically connected to the voltage and current being measured through the electronic load and the digital bridge. The electronic load detects the performance of the measured voltage and current under different load conditions, and the digital bridge detects the data values ​​of the measured voltage and current. Simultaneously, a DC relay controls the on / off switching of the controllable DC power supply, the digital bridge, the voltage and current being measured, and the electronic load, enabling the selection of voltage and current calibration and detection modes, thereby improving production utilization. Attached Figure Description

[0017] Figure 1 This is an overall connection block diagram of the present invention;

[0018] Figure 2 This is the test connection circuit diagram of this utility model;

[0019] Figure 3 This is a connection circuit diagram for a specific embodiment of the present utility model;

[0020] Figure 4 This is a connection block diagram of the voltage detection and calibration process of this utility model;

[0021] Figure 5 This is a connection block diagram of the current detection and calibration process of this utility model. Detailed Implementation

[0022] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0023] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0024] Example

[0025] This embodiment provides a voltage and current detection and calibration device, referring to... Figure 1 As shown, this utility model mainly includes a measured voltage and current, a controllable DC power supply, a digital bridge, an MCU control unit, and an electronic load. The controllable DC power supply is electrically connected to the MCU control unit, the digital bridge, and the measured voltage and current, providing them with stable and adjustable current and voltage. The MCU control unit is electrically connected to the measured voltage and current, controlling and setting the calibration detection mode of the measured voltage and current. The MCU control unit is also electrically connected to the measured voltage and current through the electronic load and the digital bridge. The electronic load detects the performance of the measured voltage and current under different load conditions, and the digital bridge detects the data values ​​of the measured voltage and current.

[0026] The controllable DC power supply is based on a common DC power supply. It utilizes the conduction and cutoff characteristics of electronic components (such as diodes, thyristors, and silicon controlled rectifiers) to control voltage and current, stabilizing the output voltage within a certain range. The controllable DC power supply circuit in this invention uses an adjustable output of 12V to 36V. The digital bridge is a UT612 handheld LCR digital bridge. The LCR digital bridge uses digital technology and a microprocessor for control, measuring electrical parameters such as resistance, capacitance, and inductance, automating the measurement process with high precision and automation. Furthermore, the handheld LCR digital bridge is more portable and suitable for use in various environments. The MCU control unit is responsible for selecting and controlling the calibration mode of the measured voltage and current. Its model is STM32G030C8T6 chip, based on a high-performance Arm Cortex-M0+ 32-bit RISC core, with an operating frequency up to 64MHz. It also has multiple built-in serial communication interfaces, enabling communication with external devices for data transmission and control.

[0027] The MCU control unit is electrically connected to the controllable DC power supply and LCR digital bridge via an RS485 interface. The RS485 interface is a serial communication standard, enabling efficient communication between the MCU control unit, the controllable DC power supply, and the LCR digital bridge. The MCU control unit is also electrically connected to a touchscreen via an RS232 interface for visually setting the output voltage, output current, operating status, and calibration status of the controllable DC power supply, as well as setting the operating mode of the voltage and current detection calibration device. The touchscreen uses the MT8050IE human-machine interface, which features a fanless cooling system, IP65 panel protection, and motherboard coating to prevent environmental corrosion, ensuring stable operation even in harsh environments.

[0028] A DC relay is installed between the controllable DC power supply, the digital bridge, the electronic load, and the MCU control unit. A DC relay is also installed between the measured voltage / current and the MCU control unit. The MCU control unit controls the opening and closing of the DC relays, thereby controlling the conduction or disconnection of the controllable DC power supply, the digital bridge, the measured voltage / current, and the electronic load, to achieve the selection of the operating mode for the measurement and calibration of the measured voltage / current.

[0029] Specifically, in this embodiment, the wiring method for each part during measurement is as follows: Figure 2 and Figure 3As shown. Terminal a of the controllable DC power supply is connected to terminal a of DC relay k1, and terminal b of the controllable DC power supply is connected to terminal a of DC relay k2. Terminal a of the LCR digital bridge is connected to terminal a of DC relay k3, and terminal b of the LCR digital bridge is connected to terminal a of DC relay k4. Terminal b of DC relay k1 is connected to terminal b of DC relay k3, terminal a of DC relay k5, and terminals a of DC relays k6-k10. Terminal b of DC relay k2 is connected to terminal b of DC relay k4, terminals b of DC relays k6-k10, and terminal b of the electronic load.

[0030] The MCU control unit is connected to the RS485 interface of the controllable DC power supply via RS485_2, to the RS485 interface of the LCR digital bridge via RS485_1, and to the RS232 interface of the touch screen via RS232. The k1_n terminal of the MCU control unit is connected to the n terminal of DC relay k1, and the k1_m terminal is connected to the m terminal of DC relay k1. The k2_n terminal of the MCU control unit is connected to the n terminal of DC relay k2, and the k2_m terminal is connected to the m terminal of DC relay k2. The k3_n terminal of the MCU control unit is connected to the n terminal of DC relay k3, and the k3_m terminal is connected to the m terminal of DC relay k3. The k4_n terminal of the MCU control unit is connected to the n terminal of DC relay k4, and the k4_m terminal is connected to the m terminal of DC relay k4. The MCU control unit's k5_n terminal is connected to the n terminal of DC relay k5, the MCU control unit's k5_m terminal is connected to the m terminal of DC relay k5, the control unit's k6_n terminal is connected to the n terminal of DC relay k6, and the control unit's k6_m terminal is connected to the m terminal of DC relay k6. When performing simultaneous multi-channel detection and calibration, the connection method follows the same sequence: the MCU control unit's k(x+6)_n terminal is connected to the n terminal of DC relay k(x+6), and the MCU control unit's k(x+6)_m terminal is connected to the m terminal of DC relay k(x+6). The MCU control unit's AD_b terminal is connected to the b terminal of the electronic load, and the MCU control unit's AD_a terminal is connected to the a terminal of the electronic load.

[0031] In this embodiment, the MCU control unit is used to select and control the detection and calibration modes, including detection and calibration voltage mode and detection and calibration current mode.

[0032] When detecting and calibrating the voltage value, the MCU control unit first closes DC relays k1, k2, k3, k4, and k6, and opens DC relays k5, k7, and k(x+6). It then reads the voltage value data from the LCR digital bridge and compares it with the set data. If the voltage value is outside the set range, the touchscreen displays "failed"; if the voltage value is within the set range, the touchscreen displays "qualified". During the voltage detection and calibration, DC relays k1 to k4 remain closed, while DC relay k5 remains open. Only by sequentially closing DC relays k6 or k(x+6) and reading the voltage value data from the LCR digital bridge can the pass / fail status of the voltage being measured corresponding to each DC relay be determined.

[0033] When testing and calibrating the current value, the MCU control unit first closes DC relays k1, k2, k3, k4, k5, and k6, and opens DC relays k7 to k(x+6). It then reads the current value data from the LCR digital bridge and compares it with the set data. If the current value is outside the set range, the touchscreen displays "failed"; if the current value is within the set range, the touchscreen displays "qualified". During the testing and calibration of the current value, DC relays k1 to k5 remain closed. Only by sequentially closing DC relays k6 or k(x+6) and reading the current value data from the LCR digital bridge can the test current for the corresponding DC relay be determined as qualified.

[0034] Furthermore, this embodiment can simultaneously perform detection and calibration of five voltage and current channels. The specific detection and calibration steps are as follows: Figure 4 and Figure 5 As shown.

[0035] During voltage calibration, the MCU control unit closes DC relays k1, k2, k3, k4, and k6, and opens DC relays k5, k7, k8, k9, and k10. The voltage data read from the LCR digital bridge is compared with the set data. If the read voltage value is outside the set range, the touchscreen displays "First channel unqualified," and calibration continues. This continues until the read voltage value is within the set range, at which point the touchscreen displays "First channel qualified." DC relay k6 is then opened, and DC relay k7 is closed. The voltage data read from the LCR digital bridge is again compared with the set data. If the voltage value is outside the set range, the touchscreen displays "Second channel unqualified," and calibration continues. This continues until the read voltage value is within the set range, at which point the touchscreen displays "Second channel qualified." This process is repeated sequentially, opening the DC relays for the previous voltage being measured and closing the relays for the next voltage being measured, until all five voltages have been tested.

[0036] During the current value calibration test, the MCU control unit closes DC relays k1, k2, k3, k4, k5, and k6, and opens DC relays k7, k8, k9, and k10. The current value of the electronic load is set to 20A on the touchscreen. The current value read from the LCR digital bridge is compared with the set value. If the read current value is outside the set range, the touchscreen displays "First channel unqualified," and calibration continues. This continues until the read current value is within the set range, at which point the touchscreen displays "First channel qualified." DC relay k6 is then opened, and DC relay k7 is closed. The current value read from the LCR digital bridge is again compared with the set value. If the current value is outside the set range, the touchscreen displays "Second channel unqualified," and calibration continues. This continues until the read current value is within the set range, at which point the touchscreen displays "Second channel qualified." This process is repeated sequentially, opening the DC relays for the previous current being measured and closing the relays for the next current being measured, until all five currents have been tested.

[0037] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 of this utility model.

[0038] Furthermore, in this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0039] The above are merely preferred embodiments of this utility model, and other embodiments are also possible. Those skilled in the art can still modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A voltage and current detection and calibration device, characterized in that: The system includes a measured voltage and current, a controllable DC power supply, and an MCU control unit. The controllable DC power supply is electrically connected to the MCU control unit, a digital bridge, and the measured voltage and current, providing them with stable and adjustable current and voltage. The MCU control unit is electrically connected to the measured voltage and current, controlling and setting the calibration detection mode of the measured voltage and current. The MCU control unit is also electrically connected to the measured voltage and current through an electronic load and a digital bridge. The electronic load detects the performance of the measured voltage and current under different load conditions, and the digital bridge detects the data value of the measured voltage and current.

2. The voltage and current detection and calibration device according to claim 1, characterized in that: The measured voltage and current can be set to multiple values, and the multiple measured voltages and currents are connected in parallel.

3. The voltage and current detection and calibration device according to claim 1, characterized in that: DC relays are provided between the controllable DC power supply, the digital bridge, the electronic load, and the MCU control unit.

4. The voltage and current detection and calibration device according to claim 3, characterized in that: A DC relay is also provided between the measured voltage / current and the MCU control unit.

5. The voltage and current detection and calibration device according to claim 1, characterized in that: The MCU control unit is electrically connected to the touch screen via an RS232 interface.

6. The voltage and current detection and calibration device according to claim 5, characterized in that: The MCU control unit is electrically connected to the controllable DC power supply and the digital bridge via an RS485 interface.

7. The voltage and current detection and calibration device according to claim 1, characterized in that: The MCU control unit uses an STM32G030C8T6 chip.

8. The voltage and current detection and calibration device according to claim 5, characterized in that: The touchscreen is an MT8050IE human-machine interface.

9. The voltage and current detection and calibration device according to claim 1, characterized in that: The digital bridge used is the UT612 handheld LCR digital bridge.

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