DC impedance detection module
By using a small detection module composed of an MCU module, a power supply module, and a DMM module, the problems of high cost, large size, and difficulty in adapting to automated testing equipment for high-precision impedance detection equipment are solved, realizing low-cost DC impedance detection that is easy to batch test.
Patent Information
- Application Number
- CN202422837052.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-11-21
AI Technical Summary
In existing technologies, high-precision impedance detection equipment is costly, bulky, and difficult to adapt to automated testing equipment, resulting in low efficiency for large-scale testing.
This small testing module, composed of an MCU module, a power supply module, and a DMM module, includes a current regulation unit and a voltage measurement unit. It achieves automated testing through a relay matrix module and is adaptable to the power supply requirements and electrical parameter measurements of different products.
It provides a low-cost, compact DC impedance detection module that can be easily applied to batch testing, improving testing efficiency and reducing costs.
Smart Images
Figure CN223664559U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model is applied to the technical field of electronic product detection, and particularly relates to a direct current impedance detection module. BACKGROUND
[0002] Electronic products and semiconductor products need to be detected before leaving the factory in order to ensure their reliability and stability, thereby avoiding selling poor quality products. At present, the industry basically uses high-precision standard instruments for impedance or voltage testing of electronic products and semiconductors, such as Agilent / 34465A digital multimeter. However, the cost is high, the operation is complex, and the space occupied is large. If applied to a large batch testing scene, the single machine testing efficiency is low, and purchasing multiple devices for detection will greatly increase the cost and make it difficult to adapt to automatic testing equipment.
[0003] If a direct current impedance detection module with small size, convenient adaptation to automatic testing equipment, and low cost can be provided, the above technical problems can be well solved. CONTENT OF THE UTILITY MODEL
[0004] The utility model solves the technical problem of overcoming the deficiency of the prior art and provides a direct current impedance detection module with small size, convenient adaptation to automatic testing equipment, and low cost, which can be applied to batch testing.
[0005] The utility model adopts the technical scheme: the utility model discloses MCU module, power module and DMM module, the power module is connected with external power, the DMM module includes current regulating unit and voltage measuring unit, the current regulating unit includes first switch, a plurality of first adjusting resistance and a plurality of second adjusting resistance, the input end of a plurality of first adjusting resistance is connected with the power module through a plurality of first on-off switch respectively, the output end of a plurality of first adjusting resistance is connected with the one end of the product to be measured through the first switch, the input end of a plurality of second adjusting resistance is connected with the other end of the product to be measured through the second on-off switch, the output end of a plurality of second adjusting resistance is grounded, the input end of the voltage measuring unit is connected in parallel in the two ends of the product to be measured through the second switch, and the output end of the voltage measuring unit is connected with MCU module communication.
[0006] It can be seen from the above scheme that by adopting the small detection module composed of the MCU module, the power module and the DMM module, a low-cost and small-size test structure is realized, which is convenient to apply in batch testing of electronic products, components and the like, effectively controls the cost and improves the efficiency. The current regulating unit is adopted to provide a stable output current, and the current can be regulated to adapt to the power supply requirements of different products. At the same time, the voltage measuring unit is adopted to collect the voltage across the product to be tested, and then the actual impedance of the product to be tested is obtained in cooperation with the current regulating unit. The voltage measuring unit collects the voltage data and feeds back to the MCU module, and the MCU module converts the collected data and sends it to the external computer, and at the same time cooperates with the automatic test equipment to realize batch testing and collect the electrical parameter information of the product to be tested.
[0007] One preferred scheme is that the current regulating unit further comprises a reference voltage chip, a first comparator and a second comparator, the input end of the reference voltage chip is connected with the power module, the positive input end of the first comparator is connected with the output end of the reference voltage chip, the negative input end of the first comparator is connected with the ground end of the product to be tested, the input end of the first regulating resistor is further connected with the input end of the second regulating resistor through a first field effect tube, the output end of the first comparator is connected with the gate of the first field effect tube, the negative input end of the second comparator is connected with the output end of the first regulating resistor, the positive input end of the second comparator is connected with the power module, the first regulating resistor is connected with the input end of the first switch through a second field effect tube, and the output end of the second comparator is connected with the gate of the second field effect tube.
[0008] One preferred scheme is that the voltage measuring unit comprises an analog-to-digital converter and an amplifier, the positive input end and the negative input end of the amplifier are connected in parallel to the two ends of the product to be tested, the output end of the amplifier is connected with the first input end of the analog-to-digital converter, and the output end of the analog-to-digital converter is connected with the MCU module for communication.
[0009] One preferred scheme is that the voltage measuring unit further comprises a third comparator, the positive input end of the third comparator is connected with the output end of the amplifier, the negative input end of the third comparator is connected with the power module, and the input end of the third comparator is connected with the second input end of the analog-to-digital converter and the reference end of the amplifier.
[0010] A preferred solution is that the first switch and the second switch are connected with the product to be tested through a relay matrix module, the relay matrix module comprises a plurality of groups of relay units, one end of each group of the relay units is connected with different interfaces of the product to be tested, and the other end of all the relay units is connected with the first switch and the second switch. BRIEF DESCRIPTION OF DRAWINGS
[0011] Fig. 1 is a system block diagram of the utility model;
[0012] Fig. 2 is a circuit principle diagram of the DMM module;
[0013] Fig. 3 is a circuit principle diagram of the relay matrix module;
[0014] Fig. 4 is a circuit principle diagram of the power module. DETAILED DESCRIPTION
[0015] As shown in Figs. 1 to 4 In the embodiment, the utility model includes MCU module 1, power module 2 and DMM module 3, the power module 2 is connected with external power supply, the DMM module 3 includes current regulating unit 31 and voltage measuring unit 32, the current regulating unit 31 includes first switch, a plurality of first regulating resistance and a plurality of second regulating resistance, the input end of a plurality of the first regulating resistance is connected with the power module 2 through a plurality of first on-off switch respectively, the output end of a plurality of the first regulating resistance is connected with one end of product to be tested through the first switch, the input end of a plurality of the second regulating resistance is connected with the other end of product to be tested through second on-off switch, the output end of a plurality of the second regulating resistance is grounded, the input end of the voltage measuring unit 32 is connected in parallel in the two ends of product to be tested through second switch, and the output end of the voltage measuring unit 32 is connected with the MCU module 1 in communication.
[0016] In the embodiment, the MCU module 1 includes processing chip of model STM32F103, the MCU module 1 is communicated with external computer through Ethernet, and then the data collected by the voltage measuring unit 32 is fed back, and simultaneously the control instruction of external computer is sent to the MCU module 1 through Ethernet, and then the on-off state of the IO port of the MCU module 1 is switched, and then the on-off of the switch in the test module is controlled, the switching of different measurement range and measurement channel is realized.
[0017] In the embodiment, the current regulating unit 31 further comprises a reference voltage chip U1, a first comparator U2 and a second comparator U3, the input end of the reference voltage chip U1 is connected with the power supply module 2, the positive input end of the first comparator U2 is connected with the output end of the reference voltage chip U1, the negative input end of the first comparator U2 is connected with the ground end of the product to be tested, the input ends of the first regulating resistors are further connected with the input ends of the second regulating resistors through a first field effect tube Q1, the output end of the first comparator U2 is connected with the gate of the first field effect tube Q1, the negative input end of the second comparator U3 is connected with the output ends of the first regulating resistors, the positive input end of the second comparator U3 is connected with the power supply module 2, the first regulating resistors are connected with the input end of the first switch through a second field effect tube Q2, and the output end of the second comparator U3 is connected with the gate of the second field effect tube Q2. The reference voltage chip U1 is a power manager with model number ADR4530, the first comparator U2 and the second comparator U3 are operational amplifier chips with model number OPA2192, the reference voltage chip U1 outputs a reference voltage to the positive input end of the first comparator U2, the first comparator U2 controls the conduction state between the input ends of the first regulating resistors and the input ends of the second regulating resistors, at the same time, the second comparator U3 collects the voltage of the output ends of the first regulating resistors and controls the conduction between the first regulating resistors and the product to be tested, so as to realize whether the detection circuit fails, and when the detection circuit fails, the conduction control is performed, so as to isolate the product to be tested from the power supply circuit and protect the product to be tested.
[0018] In the embodiment, four groups of the first regulating resistors are provided, and the resistance values of the first regulating resistors in each group are different, so as to realize the current control by connecting resistors with different resistance values, and the first conduction switches corresponding to the first regulating resistors are independently provided, so as to realize the separate control and the combination to provide more resistance value selection.
[0019] In the embodiment, the voltage measuring unit 32 comprises an analog-to-digital converter U4 and an amplifier U5, the positive input end and the negative input end of the amplifier U5 are connected in parallel to the two ends of the product to be tested, the output end of the amplifier U5 is connected with the first input end of the analog-to-digital converter U4, and the output end of the analog-to-digital converter U4 is connected with the MCU module 1 for communication. The amplifier U5 collects the voltage value of the two ends of the product to be tested and converts it into an analog signal output to the analog-to-digital converter U4, and the analog-to-digital converter U4 converts the analog signal into a digital signal and sends it to the MCU module 1.
[0020] In the embodiment, the voltage measuring unit 32 further comprises a third comparator U6, a positive input end of the third comparator U6 is connected with an output end of the amplifier U5, a negative input end of the third comparator U6 is connected with the power module 2, and an input end of the third comparator U6 is connected with a second input end of the analog-digital converter U4 and a reference end of the amplifier U5.
[0021] In the embodiment, the first switch and the second switch are connected with the product to be tested through a relay matrix module 4, the relay matrix module 4 comprises a plurality of groups of relay units, one end of each group of the relay units is connected with different interfaces of the product to be tested, and the other end of all the relay units is connected with the first switch and the second switch. By arranging the relay matrix module 4, different parts of the product to be tested are connected through the probe corresponding to each relay unit in one test, thereby sequentially testing the electrical parameters of different elements of the circuit board product to be tested in single feeding and discharging, and the test efficiency is effectively and quickly improved without repeated connection.
[0022] Although the embodiments of the utility model are described in actual schemes, but do not constitute the limitation to the meaning of the utility model, for the person skilled in the art, according to the modification of the embodiment of the specification and the combination with other schemes, it is obvious.
Claims
1. A direct current impedance detection module, comprising an MCU module (1) and a power module (2), wherein the power module (2) is connected with an external power supply, characterized in that: It also includes a DMM module (3), the DMM module (3) includes a current regulating unit (31) and a voltage measuring unit (32), the current regulating unit (31) includes a first switch, a plurality of first regulating resistors and a plurality of second regulating resistors, the input ends of a plurality of the first regulating resistors are connected with the power module (2) through a plurality of first conduction switches respectively, the output ends of a plurality of the first regulating resistors are connected with one end of the product to be measured through the first switch, the input ends of a plurality of the second regulating resistors are connected with the other end of the product to be measured through a second conduction switch, the output ends of a plurality of the second regulating resistors are grounded, the input end of the voltage measuring unit (32) is connected in parallel between the two ends of the product to be measured through a second switch, and the output end of the voltage measuring unit (32) is in communication connection with the MCU module (1).
2. The direct current impedance detection module according to claim 1, characterized in that: The current regulating unit (31) further includes a reference voltage chip (U1), a first comparator (U2) and a second comparator (U3), the input end of the reference voltage chip (U1) is connected with the power module (2), the positive input end of the first comparator (U2) is connected with the output end of the reference voltage chip (U1), the negative input end of the first comparator (U2) is connected with the ground end of the product to be measured, the input ends of a plurality of the first regulating resistors are further connected with the input ends of a plurality of the second regulating resistors through a first field effect tube (Q1), the output end of the first comparator (U2) is connected with the gate of the first field effect tube (Q1), the negative input end of the second comparator (U3) is connected with the output ends of a plurality of the first regulating resistors, the positive input end of the second comparator (U3) is connected with the power module (2), a plurality of the first regulating resistors are connected with the input end of the first switch through a second field effect tube (Q2), and the output end of the second comparator (U3) is connected with the gate of the second field effect tube (Q2).
3. The direct current impedance detection module according to claim 1, characterized in that: The voltage measuring unit (32) includes an analog-to-digital converter (U4) and an amplifier (U5), the positive input end and the negative input end of the amplifier (U5) are correspondingly connected in parallel to the two ends of the product to be measured, the output end of the amplifier (U5) is connected with the first input end of the analog-to-digital converter (U4), and the output end of the analog-to-digital converter (U4) is connected in communication with the MCU module (1).
4. The direct current impedance detection module according to claim 3, characterized in that: The voltage measuring unit (32) further includes a third comparator (U6), the positive input end of the third comparator (U6) is connected with the output end of the amplifier (U5), the negative input end of the third comparator (U6) is connected with the power module (2), and the input end of the third comparator (U6) is connected with the second input end of the analog-to-digital converter (U4) and the reference end of the amplifier (U5).
5. The direct current impedance detection module of claim 1, wherein: The first switch and the second switch are connected with the product to be tested through a relay matrix module (4), the relay matrix module (4) comprises a plurality of groups of relay units, one end of each group of the relay units is connected with different interfaces of the product to be tested, and the other end of all the relay units is connected with the first switch and the second switch.