Flying probe circuit for PCB insulation impedance test and test device
By designing series and parallel probe structures and switching control in the flying probe circuit, the problem of low probe combination flexibility is solved, and efficient PCB insulation impedance detection is achieved.
Patent Information
- Application Number
- CN202520285270.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2035-02-21
AI Technical Summary
Existing flying probe testing methods have a limited number of probes and low combination flexibility, resulting in low production line testing efficiency.
Design a flying probe circuit for PCB insulation impedance testing. It uses several probes, with sub-switches connected in series at both ends of each probe to form a series unit. A master switch is set at both ends of the parallel circuit. The master switch controls the on/off state, and the probe combination can be changed through the sub-switches. High-voltage high-speed solid-state relays and reed relays are combined to prevent residual charge from affecting the circuit.
This improves the flexibility of probe assembly, reduces the time the robotic arm spends adjusting probe positions, and significantly improves detection efficiency.
Smart Images
Figure CN223664689U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of flying probe test, concretely relates to a flying probe circuit and testing device for PCB insulation impedance test. BACKGROUND
[0002] The flying probe tester is equipped with multiple groups of mechanical arms with telescopic test probes, during testing, the computer controls the probe movement according to the preset program, the probe contacts the solder pad, via hole or component pin of the PCB point by point, and measures electrical parameters such as resistance, capacitance, voltage and current.
[0003] When testing the insulation impedance of the PCB, the flying probe test generally only sets one or two pairs of probes, the probes are abutted on the PCB through the mechanical arm, one end applies voltage, the other end is connected to the detection circuit, the current leakage is obtained through the detection circuit, and then the insulation impedance is judged, the existing probe connection circuit is simple, the number of probes is small, and the combination flexibility between the probes is low, resulting in low production line detection efficiency. UTILITY MODEL CONTENTS
[0004] The utility model discloses a flying probe circuit and testing device for PCB insulation impedance test.
[0005] The utility model discloses the following technical scheme to realize the above-mentioned purpose:
[0006] A flying probe circuit for PCB insulation impedance test, comprising a plurality of probes, both ends of each probe are provided with sub-switches in series to form a series unit, each series unit is provided in parallel with each other to form a parallel circuit, and a total switch is arranged at both ends of the parallel circuit, and the free end of the total switch is used for connecting the power supply and the detection circuit respectively.
[0007] As a further optimization scheme of the utility model, the total switch comprises a first switch for connecting the power supply and a second switch for connecting the detection circuit, the on-off of the flying probe circuit is controlled through the total switch by setting the total switch, and the first switch and the second switch are arranged as the total switch at both ends of the parallel circuit.
[0008] As a further optimization scheme of the utility model, the probes have an even number, and each two probes contact the PCB as a test pair, a plurality of test pairs can contact the PCB simultaneously, the actual access of the probes is changed through the on-off of the probes, and the detection is carried out in sequence, so that the operation time of the mechanical arm is reduced.
[0009] As a further optimization scheme of the utility model, the probes have eight, each probe is provided with two sub-switches, and the input / output direction of the two probes can be changed under the condition that the mechanical arm is stationary.
[0010] As a further optimization scheme of the utility model, two probes form a test pair between any two of the probes to connect two ends of a measured unit of the PCB.
[0011] As a further optimization scheme of the utility model, the power supply adopts a high-voltage high-speed solid-state relay and a reed relay for discharging to prevent residual charge from affecting the test result.
[0012] The utility model also provides a test device for PCB insulation impedance test, including the probe circuit of any preceding, still include control assembly, be used to carry probe's mechanical arm, detection circuit.
[0013] The utility model has the advantages that:
[0014] The utility model discloses a test pair can be combined between any two probes through the on-off control of each sub-switch, which has higher flexibility in the insulation impedance test of the PCB, and compared with adjusting the position of the probe through the mechanical arm, the present scheme can quickly switch the probe through the on-off control of the sub-switch, which helps to greatly improve the detection efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is the flying probe circuit schematic diagram of the utility model.
[0016] Figure 2 It is the first probe and second probe connection schematic diagram of the utility model.
[0017] In the drawing, S1-S17: first switch-eighteenth switch, A-H: first probe-eighth probe, V: power supply, R: measured unit. DETAILED DESCRIPTION
[0018] It is necessary to point out here that the following detailed description is only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application, and the skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.
[0019] Embodiment 1
[0020] As shown in Figures 1-2 A flying probe circuit for PCB insulation impedance test, comprising a plurality of probes, each probe is provided with a sub-switch in series at both ends to form a series unit, in the embodiment, the probe has eight, which are first probe A, second probe B, third probe C, fourth probe D, fifth probe E, sixth probe F, seventh probe G and eighth probe H, and the corresponding sub-switches include third switch S3 to eighteenth switch S17.
[0021] Each series unit is arranged in parallel with each other to form a parallel circuit, and the parallel circuit is provided with a total switch at both ends, and the total switch controls the on-off of the flying probe circuit, and the total switch includes a first switch S1 for connecting a power supply and a second switch S2 for connecting a detection circuit, a free end of the first switch S1 is connected to the power supply V, and a free end of the second switch S2 is used for the detection circuit and is grounded if necessary.
[0022] Any two probes form a test pair to connect two ends of the measured unit of the PCB, and multiple test pairs can be tested at the same time, thereby reducing the operation time of the mechanical arm, and specifically, the mechanical arm is fixed at a position, and then the 8 probes are in contact with the predetermined positions on the PCB, and then the on-off of the 8 probes is controlled through the on-off of the sub-switches, and any two probes can be combined into a test pair, which has higher flexibility in the insulation impedance test of the PCB, and compared with adjusting the position of the probe through the mechanical arm, the scheme can quickly switch the probe through the control of the on-off of the sub-switches, thereby greatly improving the detection efficiency.
[0023] The power supply V adopts a high-voltage high-speed solid-state relay and a reed relay for discharging to prevent residual charge from affecting the test result.
[0024] The utility model discloses still a kind of test device for PCB insulation impedance test, including the flying probe circuit of any one of above, still include control assembly, for carrying probe mechanical arm, detection circuit.
[0025] The embodiment is specifically: Figure 2 As shown in the drawing, R represents the measured unit on the PCB, at this time, the first switch S1, the second switch S2, the third switch S3 and the sixth switch S6 are closed, and the other switches are opened, then the voltage signal applied by the power supply V is output after passing through the first probe A, the measured unit R and the second probe B, if the fourth switch S4 and the fifth switch S5 are closed, and the third switch S3 and the sixth switch S6 are opened, then the output path of the voltage signal becomes: the second probe B, the measured unit R and the first probe A.
[0026] It is expandable that any two probes can be conducted, for example, the first probe A can form a test pair with any other probe, when the third switch S3 and the eighteenth switch S18 are closed, the first probe A and the eighth probe H form a test pair, and the output direction of the voltage signal is: the first probe A, the measured unit R and the eighth probe H.
[0027] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.
Claims
1. A flying probe circuit for PCB insulation resistance testing, characterized in that: It includes several probes, each probe has a sub-switch connected in series at both ends to form a series unit, each series unit is connected in parallel to form a parallel circuit, and the two ends of the parallel circuit are provided with a master switch, the free end of the master switch is used to connect the power supply and the detection circuit respectively.
2. The flying probe circuit for PCB insulation resistance testing according to claim 1, characterized in that: The main switch includes a first switch for connecting to the power supply and a second switch for connecting to the detection circuit.
3. The flying probe circuit for PCB insulation resistance testing according to claim 1, characterized in that: The probes have an even number.
4. A flying probe circuit for PCB insulation resistance testing according to claim 3, characterized in that: The probe has eight parts.
5. A flying probe circuit for PCB insulation resistance testing according to claim 4, characterized in that: A test pair is formed between any two of the probes to connect the two ends of the unit under test on the PCB.
6. A flying probe circuit for PCB insulation resistance testing according to claim 1, characterized in that: The power supply uses high-voltage, high-speed solid-state relays and reed relays for discharge.
7. A testing device for PCB insulation resistance testing, characterized in that: The device includes the flying probe circuit as described in any one of claims 1-6, and further includes a control component, a robotic arm for mounting the probe, and a detection circuit.