CN212134798U - Dual-mode current sensor structure - Google Patents
Dual-mode current sensor structure Download PDFInfo
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- CN212134798U CN212134798U CN202020564319.8U CN202020564319U CN212134798U CN 212134798 U CN212134798 U CN 212134798U CN 202020564319 U CN202020564319 U CN 202020564319U CN 212134798 U CN212134798 U CN 212134798U
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Abstract
The utility model provides a bimodulus current sensor structure, the device is formed by a C shape circuit board module and a rectangle heavy current detection circuit board module mutually perpendicular cross welding, there are two linear hall sensor to crowd to press from both sides between two semi-circular ferrite magnetic rings symmetrically in the rectangle heavy current detection circuit board module, it follows T font copper sheet from one end and passes through the centre of ferrite magnetic ring to be surveyed electric current, pass through the current sampling resistance and the power field effect transistor of C shape circuit board again, draw forth from other end copper sheet electrode, whole bimodulus current sensor is active device. The utility model discloses an useful part adopts a current sensor just can realize 10mA ~ 50A's wide range current detection under the condition that does not reduce measurement accuracy, has both satisfied the accurate measurement of undercurrent, the little consumption requirement when satisfying the heavy current measurement simultaneously.
Description
Technical Field
The utility model relates to a content that bimodulus current sensor structure relates belongs to electron measurement technical field for direct current wide range's measurement.
Background
The measurement of circuit current is the most common electrical parameter measurement, and the most common measurement is realized by sampling with a low-resistance resistor, and a series of "sampling resistors" is listed separately, wherein the sampling resistors have many specifications, and the sampling resistor with high current is also called a shunt. Because the implementation mode is simple, the resistance sampling mode is almost uniformly adopted in the field of small current measurement, higher precision and lower power consumption can be achieved, and most of ammeter modules are realized by the resistance sampling mode. In a large-current environment, a shunt is adopted for sampling, alternating current and direct current are commonly used, the volume of the shunt is large, and the consumed power is not small; some current transformers are adopted for sampling, the current transformers are only suitable for alternating current measurement, power loss is small, measurement accuracy is usually low, some current transformers are adopted for sampling, alternating current and direct current are common, and the measurement accuracy is also low, for example, a clamp-on ammeter is a current transformer or hall current sensor sampling mode.
The sampling resistor is a passive element, the use method is very simple, the low-current sampling resistor adopts a welding mode, the sampling resistor is used as a shunt for large-current sampling, a bolt assembly mode is basically adopted, and besides the large size, the connecting point of the main current is separated from the output point of a sampling signal. The alternating current transformer is generally of an annular structure and can be independently installed; the Hall current sensor can only be made into an active structure, is provided with an electronic circuit to realize current detection, and is basically arranged on a circuit board in a welding mode. At present, a sampling resistor, an alternating current transformer and a Hall current sensor which comprise a shunt are all integrated into a whole and are used independently.
For a standby power supply for supplying power to a high-power lithium battery pack, only milliampere current is required to be supplied at some times, but hundreds of amperes of current is required to be supplied at some occasions, and the current span is very large. In order to be able to display the current as small as milliampere level or as large as hundred ampere level in real time in a wide range, singly adopt resistance sampling or sensor sampling not to look after comprehensively, therefore can only adopt two kinds of modes of resistance and sensor sampling simultaneously, just be "bimodulus". The dual-mode sampling needs to solve the problems of high voltage drop and high power consumption generated when large current flows through a sampling resistor. For example, if a small current detection is required, a 0.02 Ω sampling resistor is used, a voltage drop is 60mV when a current of 3A flows, power consumption is 0.18W, and a 1W sampling resistor is enough to bear, but if a current of 30A flows, 18W power consumption is generated, and a non-bulky shunt cannot be used. The utility model discloses a key is undercurrent sampling resistance and heavy current hall current sensor's synthesis, constitutes the integral structure.
Disclosure of Invention
The utility model relates to a bimodulus current sensor structure comprises a C shape circuit board module and a rectangle heavy current detection circuit board module, sees from the technical aspect, has following characteristic:
in the dual-mode current sensor structure, a C-shaped circuit board module and a rectangular large-current detection circuit board module are mutually perpendicular, crossed and welded and fixed, two T-shaped conductive copper sheets with tenons are welded on the current input side of the C-shaped circuit board module, the conductive copper sheets penetrate through the hollow part of a magnetic ring of the rectangular large-current detection circuit board module, and rectangular conductive copper sheets are also welded on the current output side of the C-shaped circuit board module and serve as extraction electrodes, as shown in the attached figure 1; the C-shaped circuit board module and the rectangular large-current detection circuit board module share one 5.0V power supply port, the whole current sensor is provided with two independent detection signal output ends, and the control circuit connecting port is arranged on the outer side of the C-shaped circuit board module.
A support rod bent in an inverted-splayed shape is welded between the C-shaped circuit board module and the rectangular large-current detection circuit board module in the dual-mode current sensor structure.
In the dual-mode current sensor structure, three power field effect transistors are welded on the front side and the back side of a C-shaped circuit board module respectively, six power field effect transistors are connected with a current sampling resistor in parallel to form a main current path, and a rectangular copper sheet electrode is welded at the drain end of each field effect transistor.
In the dual-mode current sensor structure, two T-shaped conductive copper sheets parallelly penetrate through the middle of a ferrite magnetic ring of a large-current detection module, and two ends of each copper sheet and a C-shaped circuit board are fixed by welding and screws.
The dual-mode current sensor structure has the following beneficial effects:
the wide-range current detection of 10 mA-50A can be realized by adopting one current sensor under the condition of not reducing the measurement precision, the effective measurement current ratio can reach 5000: 1, the accurate measurement of small current is met, and the micro-power consumption requirement during the large current measurement is met.
The conductive copper sheet on the current input and output side of the C-shaped circuit board module can adopt a T2 copper sheet with the thickness of 1mm, and in order to prevent the copper sheet from being oxidized, the surface of the copper sheet at least needs to be subjected to tin-plating or nickel-plating treatment, and the copper sheet is better if silver plating and gold plating treatment can be carried out. The copper sheet was tightly and firmly soldered to both surfaces of the circuit board as shown in fig. 1.
Because the mechanical strength of soldering tin is lower, can only be used for circuit connection, can not bear overlarge pulling or twisting force, a support rod bent into an inverted splayed shape is assembled between the C-shaped circuit board and the rectangular large-current detection circuit board, so that the two circuit boards are firmly fixed. The support rod is 4.6cm long and 1.5mm2And the copper wire penetrates through one preformed hole of the C-shaped circuit board, is bent and then is inserted into two preformed holes of the rectangular large-current detection circuit board, and is then welded and fixed, as shown in the attached drawing 1.
Six power field effect transistors are connected in parallel on the C-shaped circuit board and used for current splitting above the measured value of the sampling resistor. The circuit board is provided with a shunt control circuit of a field effect transistor. The external processing circuit connecting ports of the whole dual-mode current sensor are concentrated into a four-pin extension socket which is positioned at the middle section of the outer side of the C-shaped circuit board. The outer dimensions of the C-shaped circuit board are shown in fig. 4.
Drawings
Fig. 1 is a perspective view of a dual-mode current sensor structure.
In the figure, 1 is a C-shaped circuit board module, 2 is a rectangular large-current detection circuit board module, 3 is a supporting rod, 4 is a T-shaped conductive copper sheet, 5 is a rectangular copper sheet electrode, 6 is a power field effect transistor, 7 is a semicircular magnetic ring, and 8 is a control circuit connecting port.
Fig. 2 is a perspective view of a rectangular large current detection circuit board module of a dual-mode current sensor structure.
In the figure, 2 is a rectangular large current detection circuit board module, 7 is a semicircular magnetic ring, and 9 is a Hall sensor.
Fig. 3 is a diagram of the external dimensions of a rectangular large-current detection circuit board module of a dual-mode current sensor structure.
Fig. 4 is a diagram of the overall dimensions of a C-shaped circuit board module of a dual-mode current sensor configuration.
Fig. 5 is a size diagram of electrodes of a T-shaped conductive copper sheet and a rectangular copper sheet with tenon protrusions on a current input side of a dual-mode current sensor structure.
Detailed Description
The following will further explain the implementation of the present invention by combining the drawings of the present invention.
The semicircular ferrite magnetic core on the sample is an anti-interference buckle type magnetic ring core with the outer diameter of 20mm, the inner diameter of 10mm and the height of 10mm, the anti-interference buckle type magnetic ring core is clamped on two sides of the Hall sensor, 704 silica gel is fixed on the circuit board and is firmly bound by a 25mm heat shrink tube or a plastic binding tape, and the overlapping gap is filled with 704 silica gel. The outline dimension of the rectangular large-current detection circuit board is shown in figure 3.
Six field effect transistors are adopted in the circuit to be connected in parallel, the current upper limit corresponds to 50A, and if the upper limit of the measured current is further improved, the number of the power field effect transistors for shunting is increased.
The rectangular copper sheet electrode at the drain end of the field effect tube adopts a rectangular copper sheet with the thickness of 1mm and the thickness of 24 multiplied by 38, the surface of the rectangular copper sheet electrode is enameled with tin and then folded, one end of the rectangular copper sheet electrode can be clamped on two surfaces of the circuit board, and after the rectangular copper sheet electrode is formed, the rectangular copper sheet electrode is drilled, corrected and fixed by screws, and then is welded with the circuit board and the drain electrode of the.
The circuit board is used as the board base of the dual-mode current sensor, the copper film on the circuit board is thin, the large current cannot be borne, the circuit board subjected to thickening treatment cannot meet the requirement, and particularly the copper film is required to be additionally added at the source electrode of the field effect transistor to increase the current carrying capacity. Therefore, the wide end of the T-shaped conductive copper sheet is provided with three tenons, and the three tenons are directly welded to the source electrodes of the three field effect transistors when the T-shaped conductive copper sheet is welded. The dimensions of the T-shaped conductive copper sheet are shown in fig. 5.
The dual-mode current sensor structure is mainly suitable for direct current detection, and the flowing direction of forward current is that a conductive copper electrode in the middle of a magnetic ring flows to a conductive copper electrode on the outer side of a field effect tube. Generally, the discharge current of a storage battery and the like is treated as a positive current, the charging current of the storage battery and the like is a negative current, the negative current cannot be larger than-5A when the sensor is used for directly detecting, if a larger charging current needs to be detected, one charging lead wire can directly penetrate through an inner hole of a magnetic ring of the sensor, and the sensor can output a current detection signal from a large-current port as usual.
The dual-mode current sensor is suitable for detecting the current of the positive line of the power supply, and the 5V working voltage of the dual-mode current sensor is negative 5V or independent 5V relative to the positive pole of the external power supply. A voltage stabilizing system is not arranged in the dual-mode current sensor, 5V working voltage is provided by an external negative power supply voltage stabilizing chip, and the 5V power supply is shared with an external microcomputer processing circuit. Compared with a 5V cathode, the signal voltage output by the dual-mode current sensor can form a common-ground structure with an external microcomputer processing circuit. And just because the dual-mode current sensor shares a 5V power supply with an external microcomputer processing circuit, a voltage stabilizing system cannot be independently arranged inside the dual-mode current sensor. The applicable system voltage range of the circuit under test depends on the voltage withstanding capability between the external 5V voltage stabilizing circuit and the circuit under test.
When the dual-mode current sensor is used, a tested circuit is connected to the copper sheet electrodes at two ends, the positive current direction of the copper sheet electrodes is consistent with the direction of a current direction mark on the C-shaped circuit board module, and an external processing circuit is connected to the four-pin extension socket port.
Claims (4)
1. A bimodulus current sensor structure, characterized by: the high-current detection circuit board module is composed of a C-shaped circuit board module and a rectangular high-current detection circuit board module, wherein the C-shaped circuit board module and the rectangular high-current detection circuit board module are mutually perpendicular, crossed, welded and fixed, two T-shaped conductive copper sheets with tenons and protrusions are welded on the current input side of the C-shaped circuit board module, the conductive copper sheets penetrate through the hollow part of a magnetic ring of the rectangular high-current detection circuit board module, and rectangular conductive copper sheets are also welded on the current output side of the C-shaped circuit board; the C-shaped circuit board module and the rectangular large-current detection circuit board module share one 5.0V power supply port, the whole current sensor is provided with two independent detection signal output ends, and the control circuit connecting port is arranged on the outer side of the C-shaped circuit board module.
2. A dual-mode current sensor structure according to claim 1, wherein: a support rod bent into an inverted-splayed shape is welded between the C-shaped circuit board module and the rectangular large-current detection circuit board module.
3. A dual-mode current sensor structure according to claim 1, wherein: the front side and the back side of the C-shaped circuit board module are respectively welded with three power field effect transistors, the six power field effect transistors are connected with the current sampling resistor in parallel, and the drain end of each field effect transistor is welded with a rectangular copper sheet electrode.
4. A dual-mode current sensor structure according to claim 1, wherein: two T-shaped conductive copper sheets parallelly penetrate through the middle of the ferrite magnetic ring of the large-current detection module, and two ends of each copper sheet are fixed with the C-shaped circuit board through welding and screws.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020564319.8U CN212134798U (en) | 2020-04-03 | 2020-04-03 | Dual-mode current sensor structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020564319.8U CN212134798U (en) | 2020-04-03 | 2020-04-03 | Dual-mode current sensor structure |
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| CN212134798U true CN212134798U (en) | 2020-12-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114521502A (en) * | 2022-01-14 | 2022-05-24 | 重庆美特亚电子科技有限公司 | Feeding trigger rod and blanking trigger control method |
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2020
- 2020-04-03 CN CN202020564319.8U patent/CN212134798U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114521502A (en) * | 2022-01-14 | 2022-05-24 | 重庆美特亚电子科技有限公司 | Feeding trigger rod and blanking trigger control method |
| CN114521502B (en) * | 2022-01-14 | 2023-07-21 | 重庆美特亚电子科技有限公司 | Feeding trigger rod and discharging trigger control method |
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