CN216285459U - Circuit board with accurate detection resistance current detection point - Google Patents
Circuit board with accurate detection resistance current detection point Download PDFInfo
- Publication number
- CN216285459U CN216285459U CN202122566183.1U CN202122566183U CN216285459U CN 216285459 U CN216285459 U CN 216285459U CN 202122566183 U CN202122566183 U CN 202122566183U CN 216285459 U CN216285459 U CN 216285459U
- Authority
- CN
- China
- Prior art keywords
- circuit board
- current detection
- current
- pin
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The utility model discloses a circuit board with accurate detection resistance current detection points, which is a printed circuit board, wherein a current detection resistor is welded on the printed circuit board, the current detection resistor is welded on a copper-clad layer of the printed circuit board through soldering tin, conductive sections are arranged at two ends of the current detection resistor, the soldering tin is welded between the end parts of the conductive sections and the copper-clad layer of the printed circuit board, a first pin connected with the copper-clad layer is arranged on the conductive section of the current detection resistor, and the first pin is inserted into a jack arranged on the copper-clad layer. The circuit board with the accurate current detection point of the current detection resistor has the characteristics of high measurement accuracy, good measurement stability, capability of displaying the current flow flowing through the current detection resistor in real time and the like.
Description
Technical Field
The utility model relates to the technical field of current detection in a flowing resistor, in particular to a circuit board with a current detection point for accurately detecting the resistor.
Background
Currently, there are several major known current testing techniques:
firstly, the method comprises the following steps: a moving coil ammeter;
II, secondly: the detection resistance method is characterized in that a resistor is connected in series into a current loop, and the magnitude of voltage reflecting current is measured;
thirdly, the method comprises the following steps: detecting the magnitude of the magnetic field of the current to be tested by utilizing the electromagnetic induction principle to measure the magnitude of the current;
the first type of moving coil current meter is the oldest current testing technology, and the current is tested by means of a method that a coil connected in series in a current loop generates electromagnetic force to deflect a pointer. It is now rarely used due to poor accuracy, etc.
For the second kind of technology, the principle is to connect a resistor with a known value in series in the current loop, and the magnitude of the current is reflected by measuring the terminal voltage of the resistor. The disadvantage of this method is that the circuit to be measured must be disconnected, and the measuring instrument or current sensor must be connected in series before the measurement can be carried out. In actual use, a circuit needs to be cut off or a current sensor needs to be placed in advance, so that the use is inconvenient, and large errors and interferences are caused by the fact that the current sensor is connected into a testing instrument in series in many occasions. If the method of presetting the current sensor in the loop is adopted, a plurality of current detection resistors are needed to be arranged for a relatively complex circuit, so that the cost is increased, the manufacture is troublesome and the volume is overlarge.
The ammeter adopting the technology is used for measuring the current, a plurality of lines need to be cut, and the method is troublesome, inconvenient to operate and seriously affects the reliability of the circuit.
For the third type of technology, which is typically a clamp ammeter, the current can be measured by clamping the test clamp to the remaining conductor of the current to be tested, and detecting the magnitude of the electromagnetic field in the test clamp. The technical defect is that only alternating current can be measured, and for most weak current electronic products, the situation that wires can be clamped into a test clamp is not likely, so that the test method is basically limited to the range of strong current.
The most common method for measuring current in electronic circuits today is by dividing the voltage drop measured across the current sensing resistor by the resistance of the current sensing resistor: and I is V/R. To achieve highly accurate current measurement, it is necessary to adapt the parameter values of the current sensing resistor and the amplifier well.
FIG. 1 shows a typical schematic of current sensing; when the current detection resistor of the schematic diagram is converted into the layout of the printed circuit board, an error condition as shown in fig. 2 occurs, and an engineer easily converts the schematic diagram into the printed circuit board to have the error detection mode as shown in fig. 2, wherein the actual resistance value of the current detection resistor is equal to the resistance value of the current detection resistor plus the difference resistance value of the welding process. Different soldering processes can result in different resistance differences between the current sensing resistor and the printed circuit board.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art, and provides a circuit board which is provided with a current detection point for accurately detecting the resistance, has high precision and good stability, and can display the current flow flowing through the current detection resistance in real time.
In order to achieve the purpose, the technical scheme of the utility model is to provide a circuit board with an accurate detection resistance current detection point, wherein the circuit board is a printed circuit board, a current detection resistance is welded on the printed circuit board and is welded on a copper-clad layer of the printed circuit board through soldering tin, conductive sections are arranged at two ends of the current detection resistance, the soldering tin is welded between the end parts of the conductive sections and the copper-clad layer of the printed circuit board, a first pin connected with the copper-clad layer is arranged on the conductive section of the current detection resistance, and the first pin is inserted into a jack arranged on the copper-clad layer.
In order to accurately detect the voltage across the current detection resistor and prevent the current detection resistor from being interfered by the resistance generated by the soldering tin, the preferred technical scheme is that one end of the first pin is arranged in the middle of the conducting segment.
In order to accurately detect the voltage across the current detection resistor and prevent the voltage from being interfered by the resistor generated by the soldering tin, a preferable technical scheme is that one end of the first pin is arranged at the connecting part of the current detection resistor and the conducting segment.
In order to firmly connect the first pin with the end of the current conducting section or the current detecting resistor and to realize automatic connection, the preferred technical scheme is that one end of the first pin is connected with the current conducting section in a riveting or hot melting mode.
In order to firmly connect the first pin with the end part of the copper-clad layer on the printed circuit board and to realize automatic connection, the other end of the first pin is tightly matched with the jack on the copper-clad layer.
In order to firmly connect the first pin with the end part of the copper-clad layer on the printed circuit board and to realize automatic connection, the other end of the first pin is bonded with the jack on the copper-clad layer through conductive adhesive.
In order to reduce the space occupied by the current detection resistor on the printed circuit board, a further preferred technical solution is that the current detection resistor is a patch type current detection resistor.
In order to improve the conductive effect between the first pin and the copper-clad layer on the pin circuit board, a further preferred technical scheme is that the first pin is made of silver or red copper material.
In order to measure the current flowing through the current detecting resistor or the voltage value at the two ends of the current detecting resistor, a further preferred technical scheme is that the two ends of the conducting segment are also provided with second pins.
In order to facilitate accurate measurement and effective reading of the current flowing through the current detection resistor or facilitate measurement of the voltage value at the two ends of the current detection resistor, a further preferred technical solution is that an amplifying circuit is arranged in a detection circuit for detecting the voltage value between the two ends of the first pin.
The circuit board provided with the accurate current detection resistor current detection point has the advantages and beneficial effects that the circuit board is high in measurement accuracy and good in measurement stability, and can display the current flow flowing through the current detection resistor in real time. The circuit board with the accurate detection resistance current detection point fundamentally avoids the error measurement mode in fig. 1 when a principle diagram is converted into a printed circuit board by a detector, and the actual resistance value of the current detection resistor is equal to the resistance value of the current detection resistor through an improved detection layout method, so that the actual resistance value difference of the current detection resistor cannot be caused by different welding processes. The existing layout mode is only suitable for the welding resistance value caused by the current detection resistance value far larger than the welding resistance value caused by the welding process except for the error detection mode shown in the figure 1. The improved and optimized detection mode of the utility model is suitable for all modes of sampling and detecting current by the current detection resistor, and has no special requirement on the welding process
Drawings
FIG. 1 is a typical schematic diagram of current sensing in the prior art;
FIG. 2 is a schematic diagram of a prior art structure of the connection of two ends of a current-detecting resistor;
FIG. 3 is a schematic diagram of current sensing of the current sensing resistor of the present invention;
FIGS. 4.1 and 4.2 are a first wiring diagram and a second wiring diagram of current detection of the current detection resistor in the utility model, respectively;
FIG. 5 is a diagram of a solder joint between a conventional resistor and a copper clad layer on a printed circuit board;
FIG. 6 is a diagram showing the soldering between the current sensing resistor and the copper clad layer on the printed circuit board according to the present invention.
FIG. 1 shows a printed wiring board; 1.1, coating a copper layer; 1.11, a jack; 2. current detecting resistance; 2.1, a conductive segment; 3. soldering tin; 4. a first pin; 5. a second pin; 6. an amplifying circuit.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 3 to 6, the utility model is a circuit board with an accurate detection point for detecting resistance current, the circuit board is a printed circuit board 1, a current detection resistor 2 is welded on the printed circuit board, the current detection resistor 2 is welded on a copper-clad layer 1.1 of the printed circuit board 1 through a soldering tin 3, conductive sections 2.1 are arranged at two ends of the current detection resistor 2, the soldering tin 3 is welded between the end of the conductive section 2.1 and the copper-clad layer 1.1 of the printed circuit board 1, a first pin 4 connected with the copper-clad layer 1.1 is arranged on the conductive section 2.1 of the current detection resistor 2, and the first pin 4 is inserted into a jack 1.11 arranged on the copper-clad layer 1.1.
In order to accurately detect the voltage across the current detecting resistor 2 without being interfered by the current detecting resistor generated by the solder 3, the preferred embodiment of the present invention is to arrange one end of the first pin 4 in the middle of the conducting segment 2.1.
In order to accurately detect the voltage across the current detecting resistor 2 so that the voltage is not interfered by the current detecting resistor generated by the soldering tin 3, in a preferred embodiment of the utility model, one end of the first pin 4 is arranged at the connecting part of the current detecting resistor 2 and the conducting segment 2.1.
In order to connect the first pin 4 to the end of the conducting segment 2.1 or the current detecting resistor 2 firmly and to facilitate automated connection, a preferred embodiment of the present invention is that one end of the first pin 4 is connected to the conducting segment 2.1 by riveting or heat fusing.
In order to firmly connect the first pin 4 with the end of the copper-clad layer 1.1 on the printed circuit board 1 and to facilitate the automatic connection, a further preferred embodiment of the present invention is that the other end of the first pin 4 is tightly fitted into the insertion hole 1.11 on the copper-clad layer 1.1.
In order to firmly connect the first pin 4 with the end of the copper-clad layer 1.1 on the printed circuit board 1 and to facilitate the automatic connection, a further preferred embodiment of the present invention is that the other end of the first pin 4 is bonded with the insertion hole 1.11 on the copper-clad layer 1.1 by a conductive adhesive.
In order to reduce the space occupied by the current detecting resistor 2 on the printed circuit board 1, a further preferred embodiment of the present invention is that the current detecting resistor 2 is a patch type current detecting resistor.
In order to improve the conductive effect between the first lead and the copper-clad layer 1.1 on the pin circuit board 1, a further preferred embodiment of the present invention is that the first lead 4 is made of silver or red copper.
In order to facilitate the measurement of the current flowing through the current detecting resistor 2 or the measurement of the voltage across the current detecting resistor, a further preferred embodiment of the present invention further includes a second pin 5 disposed at two ends of the conducting segment 2.1.
In order to facilitate accurate measurement and efficient reading of the current flowing through the current sensing resistor 2 or to facilitate measurement of the voltage across the current sensing resistor, a further preferred embodiment of the utility model further comprises an amplifier circuit 6 in the detection circuit for detecting the voltage across the first pin 4.
Current detection resistor in the utility model: also known as Current Sensing Resistor, and is called Current Sensing Resistor in english.
Connected in series with the detected current path to sample the current flowing through the path.
An amplifier: operational amplifiers (abbreviated as "op-amps"). Is a circuit unit with a very high amplification factor.
The circuit board provided with the accurate detection resistance current detection point is different from the current detection board in the prior art in that:
as shown in fig. 1 and 2, the most common method for measuring current is to divide the voltage drop measured by the current detecting resistor by the resistance of the current detecting resistor: i ═ V/R
To achieve highly accurate current measurement, it is necessary to adapt the parameter values of the current sensing resistor and the amplifier well. Fig. 1 shows a typical schematic of current sensing:
the switching of the current detection resistance of the schematic diagram to the layout of the printed circuit board can occur as shown in fig. 2, 4.1 and 4.2 as follows: wherein: the layout of fig. 2 is erroneous and fig. 4.1, 4.2 are efficient layout methods.
The prior art has the following disadvantages: 1. the error mode of figure 2 is easily caused when a principle diagram is converted into a printed circuit board by a measuring person; 2. in the conventional layout method, the actual resistance value of the current detection resistor is equal to the resistance value of the current detection resistor plus the difference resistance value of the welding process, and different resistance value differences exist between the current detection resistor and the printed circuit board due to different welding processes.
As shown in fig. 3, the present invention is a schematic diagram of a detection wiring in a circuit board provided with a precise detection resistance current detection point, and the detection resistance in the schematic diagram is changed as follows: the current detecting resistor is optimized from 2 pins to 4 pins, and the layout of the printed circuit board is optimized as one wiring diagram and the other wiring diagram of the current detecting resistor current detection in the diagrams 4.1 and 4.2.
The utility model radically avoids the error mode of figure 2 when a principle diagram is converted into a printed circuit board by a detector, improves the layout method, and avoids the difference of the actual resistance values of the current detecting resistors caused by different welding processes because the actual resistance value of the current detecting resistor 2 is equal to the resistance value of the current detecting resistor.
The difference of flow detection modes before and after layout is improved:
before the improvement, as shown in figure 5: regardless of the previous incorrect layout of FIG. 2: the current flows between the A terminal and the B terminal, the +/-input sent to the amplifier is also the A terminal and the B terminal, and the actual resistance value from the A terminal to the B terminal is the resistance value of the resistor of the current detection plus the resistance value of the welding process. When the resistance value of the current detection resistor is far larger than that of the welding process and the resistance value of the welding process can be ignored, the whole current detection loop is normal. When the resistance value of the welding process is not negligible compared with the resistance value of the current detection resistor, an error exists in the whole current detection loop. The error is also different due to the difference of the welding process, the resistance value of the current detection resistor is usually in the range of Ω (ohm)/m Ω (milliohm), and the resistance value of the welding process belongs to the range of m Ω (milliohm)/u Ω (micro ohm).
As shown in fig. 6 after the improvement: the current flows in the direction that the A terminal and the B terminal are sent to +/-input of the amplifier are the C terminal and the D terminal, and the actual resistance value from the C terminal to the D terminal is the resistance value of the resistor of the current detection plus the resistance value of the welding process. Because the current channel is an A-B terminal, a current loop cannot be formed at a C-D terminal, and therefore the welding process resistance values of the A terminal and the B terminal do not need to be considered: only the parameters of the amplifier are taken into account (the influence of the amplifier parameters is equally applicable before the improvement). The input impedance of the amplifier is very high and is M Ω (mega ohm), and the resistance of the welding process is M Ω (milliohm)/u Ω (micro ohm). Therefore, the resistance value of the welding process does not influence the resistance value of the actual current detection resistor.
The layout mode before improvement excludes the wrong layout of figure 2, and is only suitable for the situation that the resistance value of the current detection resistor is far larger than the welding resistance value caused by the welding process.
The mode after the layout optimization is suitable for all modes of sampling and detecting current through the current detection resistor, and has no special requirements on the welding process.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The circuit board is characterized in that the circuit board is a printed circuit board, a current detection resistor is welded on the printed circuit board, the current detection resistor is welded on a copper-clad layer of the printed circuit board through soldering tin, conductive sections are arranged at two ends of the current detection resistor, the soldering tin is welded between the end of each conductive section and the copper-clad layer of the printed circuit board, a first pin connected with the copper-clad layer is arranged on the conductive section of the current detection resistor, and the first pin is inserted into a jack arranged on the copper-clad layer.
2. The circuit board with the accurate detection resistance current detection point as claimed in claim 1, wherein one end of the first pin is disposed at the middle of the conductive segment.
3. The circuit board with the point for accurately detecting the resistance current according to claim 1, wherein one end of the first pin is disposed at a connecting portion of the current detecting resistor and the conductive segment.
4. The circuit board with the accurate detection resistance current detection point as claimed in claim 3, wherein one end of the first pin is connected with the conductive segment by riveting or hot melting.
5. The circuit board with the accurate detection resistance current detection point as claimed in claim 3 or 4, wherein the other end of the first pin is tightly matched with the jack on the copper-clad layer.
6. The circuit board with the accurate detection resistance current detection point as claimed in claim 3 or 4, wherein the other end of the first pin is bonded with the jack on the copper-clad layer through a conductive adhesive.
7. The circuit board with the accurate detection resistance current detection point as claimed in claim 1, wherein the current detection resistance is a patch type current detection resistance.
8. The circuit board with the accurate detection resistance current detection point as claimed in claim 1, wherein the first pin is made of silver or red copper material.
9. The circuit board with the accurate detection point for the resistance current according to claim 1, wherein a second pin is further provided at two ends of the conductive segment.
10. The circuit board with the accurate detection point for the resistance current according to claim 1, wherein an amplifying circuit is provided in the detection circuit for detecting the position between the two ends of the first pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122566183.1U CN216285459U (en) | 2021-10-25 | 2021-10-25 | Circuit board with accurate detection resistance current detection point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122566183.1U CN216285459U (en) | 2021-10-25 | 2021-10-25 | Circuit board with accurate detection resistance current detection point |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216285459U true CN216285459U (en) | 2022-04-12 |
Family
ID=81070389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122566183.1U Active CN216285459U (en) | 2021-10-25 | 2021-10-25 | Circuit board with accurate detection resistance current detection point |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216285459U (en) |
-
2021
- 2021-10-25 CN CN202122566183.1U patent/CN216285459U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112164359B (en) | Display device and detection method thereof | |
| CN105865319A (en) | PCB testing method, PCB manufacturing method and PCB | |
| CN216285459U (en) | Circuit board with accurate detection resistance current detection point | |
| CN110426622A (en) | A kind of voltage and current source test circuit and test method | |
| US5504422A (en) | Polarity testing process and device for electrolytic capacitors | |
| JP2001050995A (en) | Impedance measuring device for electronic component | |
| JP6076709B2 (en) | Continuity inspection device and continuity inspection method | |
| EP3385726A1 (en) | Kelvin connection with positional accuracy | |
| EP3527995B1 (en) | Shunt resistor and measurement system | |
| JP3145506B2 (en) | Connection test method for 4-wire resistance measurement and 4-wire resistance measurement device capable of implementing the method | |
| CN105652088B (en) | The test device of external interface contact impedance | |
| CN105717407A (en) | Fault detection for a flexible probe tip | |
| US7642804B2 (en) | Testing high frequency signals on a trace | |
| JPH1164428A (en) | Component inspection device | |
| CN205003215U (en) | Be applied to printed circuit board's four -wire test circuit | |
| EP1209476A1 (en) | Electronic device and manufacturing method thereof | |
| KR100476740B1 (en) | Method for testing rlc parallel circuit on the printed circuit board | |
| CN111025130B (en) | SMT detection method for multilayer interconnected FPC | |
| CN113109694A (en) | Method for detecting and positioning short circuit point of circuit board | |
| CN212519543U (en) | Pad structure, circuit board and air conditioner | |
| WO2023135977A1 (en) | Current detecting device, and method for manufacturing same | |
| CN112731111B (en) | Novel PCBA device failure short circuit test method | |
| CN217606069U (en) | Calibration device | |
| JP4876026B2 (en) | Board inspection equipment | |
| JPS6349727Y2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |