CN212379473U - Online current measuring device of circuit board - Google Patents
Online current measuring device of circuit board Download PDFInfo
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- CN212379473U CN212379473U CN202020426082.7U CN202020426082U CN212379473U CN 212379473 U CN212379473 U CN 212379473U CN 202020426082 U CN202020426082 U CN 202020426082U CN 212379473 U CN212379473 U CN 212379473U
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Abstract
The utility model discloses a circuit board on-line current measuring device, include: the device body comprises a shell, a computer control panel is arranged in the shell, a light touch switch is arranged on the computer control panel, the touch end of the light touch switch is exposed out of the shell, a display device is embedded on the outer surface of the shell, and the display device is connected with the computer control panel; the probe assembly comprises a probe and a probe substrate, one end of the probe is welded on the probe substrate, the other end of the probe is movably connected with a test point of an object to be tested, and the probe assembly is connected with the computer control board through a probe socket. The new measuring device used by the application only needs to put two probes on two test points on the copper foil of the circuit board respectively, the test method is simple, and the problems of cutting off a connecting wire of the circuit board and repairing the circuit board after measurement are avoided during current measurement; meanwhile, the device is small and practical, and is convenient for technicians to carry and measure.
Description
Technical Field
The utility model relates to a current detection technical field, in particular to online current measuring device of circuit board.
Background
In the process of designing, developing or manufacturing a PCBA (printed circuit board assembly) of an electronic product (electronic component which completes design function after welding corresponding components on the printed circuit board), when a circuit breaks down and needs to be maintained, the current of some circuit components in the PCBA is often required to be measured to judge whether the components work normally. At present, the current of a component is generally measured by using an ammeter, and the current is measured by disconnecting a copper foil of a circuit board from the ammeter in series, and the disconnected part of a printed board needs to be repaired after the measurement is finished, so that the current measuring method is time-consuming and labor-consuming.
Therefore, it is necessary to find a new on-line current measuring method and manufacture a corresponding device to improve the on-line current measuring efficiency of the circuit board.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an online current measuring device of circuit board is provided, it has overcome prior art's above-mentioned defect.
The utility model discloses the technical problem that solve is realized through following technical scheme:
a circuit board on-line current measurement device comprising:
the device body comprises a shell, a computer control panel is arranged in the shell, a light touch switch is arranged on the computer control panel, the touch end of the light touch switch is exposed out of the shell, a display device is embedded on the outer surface of the shell, and the display device is connected with the computer control panel;
the probe assembly comprises a probe and a probe substrate, one end of the probe is welded on the probe substrate, the other end of the probe is movably connected with a test point of an object to be tested, and the probe assembly is connected with the computer control board through a probe socket.
Preferably, in the above technical scheme, a switch opening is reserved on the housing, and the touch end of the tact switch is exposed out of the switch opening and used as a startup and shutdown and test start key.
Preferably, in the above technical solution, a battery holder is disposed on the computer control board, and a battery is further disposed in the housing and connected to the computer control board through the battery holder.
Preferably, in the above technical solution, the display device is an LCD screen for displaying the test result and the battery power information.
Preferably, in the above technical solution, the probe is connected to the probe socket through a wire.
Preferably, in the above technical solution, the housing is a plastic casing.
Preferably, in the above technical solution, there are two probes.
Preferably, in the above technical scheme, the computer control board is further provided with a Micro Control Unit (MCU) and a plurality of electronic components.
The above technical scheme of the utility model, following beneficial effect has:
compared with the prior art, the circuit board online current measuring device realizes current measurement indirectly by testing the voltage between two points on the copper foil of the circuit board, and a measuring method that the copper foil of the circuit board is disconnected and connected with an ammeter in series is not needed when the current measurement is carried out, and a printed board is not needed to be repaired after the measurement, so that the time and the labor are saved, and the working efficiency is improved; meanwhile, the device is small and exquisite and easy to carry, technicians can conveniently carry the device for detection, and meanwhile, the one-key detection method is simple, convenient and quick.
Drawings
Fig. 1 is a cross-sectional view of the circuit board on-line current measuring device of the present invention.
Fig. 2 is a working schematic diagram of the circuit board online current measuring device of the present invention.
Fig. 3 is the current measurement schematic diagram of the circuit board on-line current measurement device of the present invention.
The device comprises a shell 1, a battery 2, a display device 3, a connector 4, a computer control board 5, a probe socket 6, a tact switch 7, a probe 8, a probe substrate 9 and a lead 10.
Detailed Description
The following detailed description of the present invention is provided to facilitate further understanding of the invention.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Fig. 1 is a schematic diagram of the circuit board online current measuring device of the present invention. As shown in the figure: an on-line current measuring device for a circuit board comprises a device body and a probe assembly which can be movably connected. In detail:
the device body comprises a shell 1, a computer control panel 5 is arranged in the shell 1, a tact switch 7 is arranged on the computer control panel 5, and the touch end of the tact switch 7 is exposed out of the shell 1. That is, a switch opening is reserved on the housing 1, and the touch end of the tact switch 7 is exposed out of the switch opening and used as a startup and shutdown and test start key. The outer surface of the shell 1 is embedded with a display device 3, and the display device 3 is connected with a computer control panel 5. Further, the display device 3 is connected to the computer control board 5 through the connector 4. The shell 1 is also internally provided with a battery 2, and the battery 2 is connected with the computer control panel 5 through a battery clamping seat. Preferably, the battery is a button battery. Preferably, the display device 3 is an LCD screen for displaying the test results and the battery power information. Preferably, the housing is a plastic shell. Of course, the present invention is not limited thereto, and those skilled in the art may make corresponding substitutions as needed.
The probe assembly comprises a probe 8 and a probe substrate 9, one end of the probe 8 is welded on the probe substrate 9, the other end of the probe is movably connected with a test point of an object to be tested, and the probe assembly is connected with the computer control board 5 through a probe socket 6. And the probe 8 is connected with the probe socket 6 through a lead. Preferably, the conductor is a circuit board copper foil conductor. Specifically, the probe socket 6 can be inserted into the computer control board 5, when the probe socket is inserted, the probe assembly is connected with the device body, and then the light touch switch is pressed to start testing; after the measurement is completed, the test current value will be displayed on the LCD screen. The probe 8 is a quick-wear part, so that an independent probe assembly is made, the probe assembly can conveniently replace electrodes with different intervals according to the measurement precision requirement, and the probe can be quickly replaced when damaged. The two test probes are preferably spaced about 20mm apart in this application. Of course, the present invention is not limited thereto.
The utility model discloses an online current measuring device of circuit board, its working process as follows:
(1) pressing the touch switch (test starting switch K) for 3 seconds to start the device;
(2) the two probes are detected to the test position, the touch switch is lightly pressed, the device starts to test, and the tested current can be displayed on the LCD screen;
(3) the light touch switch is lightly pressed again to test the current of other nodes;
(4) after the test is finished, the power supply is turned off by pressing the touch switch for 3 seconds in the starting state of the device.
Fig. 2 is a working schematic diagram of the circuit board online current measuring device of the present invention. Fig. 3 is the current measurement schematic diagram of the circuit board on-line current measurement device of the present invention. As shown in fig. 2 and 3:
the preferred design volume for the device of the present application is approximately 110x30x13mm3. The main components of the device are as follows: the device comprises a shell (a plastic shell), a computer control panel (a printed circuit board assembly), a measuring probe (A.B), a display device (an LCD display module), a light touch switch (a test starting switch K), a battery and the like. The distance between the two test probes is about 20mm (the distance can be properly adjusted according to the actual use requirement when the distance is designed, and the measurement precision is improved due to the large distance).
The working principle is as follows:
when the circuit works, after two probes are detected to a test position of a copper foil wire of a printed board, a starting switch K is pressed, the device starts to work, the MCU in the figure 2 controls to disconnect the analog switch in the figure 2, at the moment, the voltage V1 (the voltage is the voltage drop generated by the working current of the circuit board flowing through a copper foil wire resistor Rn) can be measured, the voltage V1 is amplified by the amplifier and then input to the A/D converter, and the voltage is converted into digital voltage by the A/D converter and then is transmitted to the MCU for operation and temporary storage.
The MCU sets the current value and polarity of the constant current source according to the magnitude and polarity of V1 (a controllable constant current source Is arranged In the device, the magnitude and polarity of the output current can be set by the MCU), then the MCU controls and closes the analog switch In the figure 2, the current In the circuit Is the sum of the current Is set by the constant current source and the working current In of the circuit board, the current In the circuit simultaneously flows through a copper foil lead resistor Rn, the probe can measure a voltage V2 at two ends of the copper foil lead, and the voltage value Is sent to the MCU and temporarily stored In the MCU In the same way of the V1 signal.
The results V1 and V2 obtained from the above measurements can be expressed by the following formulas:
V1＝In*Rn-----(1)
V2＝(In+Is)*Rn----(2)
in the above two formulas:
in: for the current value (current value to be measured) flowing through the copper foil wire of the circuit board to be measured
Rn: resistance of wire between two probes (unknown quantity)
Is: constant current source current (set to known quantity by MCU)
According to the two formulas, the following formula can be obtained:
In＝Is*V1/(V2-V1)---(3)
MCU according to above formula (3): and (3) calculating the current In actually flowing through the copper foil wire. The MCU then displays the calculated value of In on the LCD screen, thus completing the entire current measurement process.
In the device, a probe is designed into a needle-shaped structure, one end of the probe is connected with an internal circuit board of the device, and the other end of the probe is arranged outside the device for measurement. Because the surface of a general printed board is coated with the insulating paint, the probe can effectively contact the copper foil lead of the printed board only by puncturing the insulating paint, so that the probe has higher requirements on the material and processing used by the probe.
The device can test direct current and low-frequency alternating current. The used new measuring device only needs to put two probes on two test points respectively, the test method is simple, and the problems of cutting off and later repair are avoided; meanwhile, the device is small and practical, and is convenient for technicians to carry and measure.
Although the present invention has been described with reference to the above embodiments, it is not intended to limit the present invention, and various alternatives and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (8)
1. An on-line current measuring device for a circuit board, comprising:
the device body comprises a shell, a computer control panel is arranged in the shell, a light touch switch is arranged on the computer control panel, the touch end of the light touch switch is exposed out of the shell, a display device is embedded on the outer surface of the shell, and the display device is connected with the computer control panel;
the probe assembly comprises a probe and a probe substrate, one end of the probe is welded on the probe substrate, the other end of the probe is movably connected with a test point of an object to be tested, and the probe assembly is connected with the computer control board through a probe socket.
2. The on-line current measuring device of circuit board as claimed in claim 1, wherein a switch opening is reserved on the housing, and the touch end of the tact switch is exposed out of the switch opening and used as a switch on/off and test start button.
3. The on-line current measuring device of circuit board as claimed in claim 1, wherein a battery is further disposed in the housing, and the battery is connected to the computer control board through a battery holder.
4. The on-line current measuring device of claim 1, wherein the display device is an LCD screen for displaying the test result and the battery power information.
5. The circuit board on-line current measuring device of claim 1, wherein the probe is connected to the probe socket by a wire.
6. The circuit board on-line current measuring device of claim 1, wherein said housing is a plastic housing.
7. The circuit board on-line current measuring device of claim 1, wherein said probes are two in number.
8. The on-line circuit board current measuring device of claim 1, wherein the computer control board is further provided with a micro control unit and a plurality of electronic components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020426082.7U CN212379473U (en) | 2020-03-30 | 2020-03-30 | Online current measuring device of circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020426082.7U CN212379473U (en) | 2020-03-30 | 2020-03-30 | Online current measuring device of circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212379473U true CN212379473U (en) | 2021-01-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020426082.7U Active CN212379473U (en) | 2020-03-30 | 2020-03-30 | Online current measuring device of circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212379473U (en) |
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2020
- 2020-03-30 CN CN202020426082.7U patent/CN212379473U/en active Active
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