阅读说明：本技术 一种扩大电流传感器检测量程的装置 (Device for enlarging detection range of current sensor ) 是由 何家远 张祎 潘卓 王洪生 张金铎 于 2021-01-28 设计创作，主要内容包括：本发明公开了一种扩大电流传感器检测量程的装置,包括检测模块和旁路分流模块；检测模块、旁路分流模块的输入端分别连接功率供电电源的输出端,检测模块、旁路分流模块的输出端分别连接负载模块；旁路分流模块为PCB板上的铺铜平面,铺铜平面与检测模块的电流检测管脚并联设置,将从功率供电电源流向所述负载模块的供电电流一分为二,实现对供电电流的分流；该旁路分流模块具有已知的分流比,根据所述分流比以及检测模块的输出电流值计算功率供电电源提供的实际供电电流；本发明采用PCB印制线分流的方案进行分流,使大电流检测能通过采用小量程的电流传感器检测的方式实现,无需使用大量的分立电子器件,具有电路体积小、成本低廉等优点。(The invention discloses a device for expanding the detection range of a current sensor, which comprises a detection module and a bypass shunt module, wherein the detection module comprises a first detection module and a second detection module; the input ends of the detection module and the bypass shunt module are respectively connected with the output end of the power supply source, and the output ends of the detection module and the bypass shunt module are respectively connected with the load module; the bypass shunt module is a copper-laying plane on the PCB, the copper-laying plane is arranged in parallel with a current detection pin of the detection module, and the power supply current flowing from the power supply to the load module is divided into two parts to realize the shunt of the power supply current; the bypass shunt module has a known shunt ratio, and calculates the actual supply current provided by the power supply according to the shunt ratio and the output current value of the detection module; the invention adopts the PCB printed line shunting scheme for shunting, so that the large current detection can be realized by adopting a small-range current sensor detection mode, a large number of discrete electronic devices are not required, and the invention has the advantages of small circuit volume, low cost and the like.)

1. A device for expanding the detection range of a current sensor is characterized by comprising a detection module and a bypass shunt module;

the input ends of the detection module and the bypass shunt module are respectively connected with the output end of the power supply source, and the output ends of the detection module and the bypass shunt module are respectively connected with the load module;

the bypass shunt module is a copper-laying plane on the PCB, the copper-laying plane is arranged in parallel with a current detection pin of the detection module, and divides the power supply current flowing from the power supply to the load module into two parts to realize the shunt of the power supply current;

the bypass shunt module has a known shunt ratio, and calculates an actual supply current provided by the power supply according to the shunt ratio and an output current value of the detection module.

2. The apparatus for extending the sensing range of a current sensor of claim 1, further comprising a current calibration module;

the current correction module is arranged between the output end of the power supply and the detection module and is used for detecting the power supply current value output by the power supply;

the shunt ratio of the bypass shunt module is the ratio of the output current value of the detection module to the power supply current value output by the power supply.

3. The apparatus for expanding the sensing range of a current sensor as claimed in claim 1, wherein the shunt ratio of the bypass shunt module is adjusted by adjusting the length and/or width of a copper-clad plane connected in parallel with the current sensing pin of the sensing module.

4. The apparatus for expanding the measuring range of the current sensor as claimed in claim 1, wherein the detecting module employs a hall current sensor.

5. The apparatus for expanding the detection range of the current sensor as claimed in claim 2, wherein the current calibration module employs an external ac/dc current clamp to detect the supply current value output by the power supply.

6. The apparatus for expanding the sensing range of a current sensor as claimed in claim 1, wherein the sensing module and the bypass shunt module are disposed on the PCB.

Technical Field

The invention belongs to the technical field of motor control, and particularly relates to a device for enlarging the detection range of a current sensor.

Background

The electric servo mechanism for spaceflight adopts various motors (direct current brush motors, direct current brushless motors and permanent magnet synchronous motors) as the core of electromechanical energy conversion, and the impact current is limited in order to prevent the impact current from damaging other related devices due to the fact that the peak impact current of a power bus of a power bridge is large at the moment of starting and positive and negative rotation reversing of the motors.

The current limiting method comprises the steps of detecting the bus current, comparing a signal obtained by detection with a reference voltage through a comparator, and triggering a motor to drive a peripheral logic circuit to turn off a power bridge driving signal when the signal voltage obtained by detection exceeds the reference voltage so as to rapidly reduce the bus current. The current detection mode comprises a precision resistance sampling mode and a Hall current sensor sampling mode. Because the resistance sampling mode can not realize the electrical isolation of the power loop and the control loop, the resistance sampling mode is less adopted in a high-power aerospace servo mechanism, and the detection mode of a Hall current sensor is usually adopted. The Hall current sensor has different external dimensions and packaging forms according to different detection ranges, the larger the detection range is, the larger the external dimensions of the current sensor are, and the higher the selling price is.

For a high-power aerospace servo mechanism, because the maximum peak current possibly occurring in the system is high (up to nearly one hundred amperes), a Hall current sensor with the detection range of over one hundred amperes needs to be selected, and the cost and the circuit volume of a current detection loop are increased.

Disclosure of Invention

The invention provides a device for expanding the detection range of a current sensor aiming at least one defect or improvement requirement in the prior art, and aims to solve the defects of high circuit cost and large volume caused by the adoption of a large-range sensor for large-current detection in the existing detection circuit.

To achieve the above object, according to one aspect of the present invention, there is provided an apparatus for expanding a detection range of a current sensor, including a detection module and a bypass shunt module;

the input ends of the detection module and the bypass shunt module are respectively connected with the output end of the power supply source, and the output ends of the detection module and the bypass shunt module are respectively connected with the load module;

the bypass shunt module is a copper-laying plane on the PCB, the copper-laying plane is arranged in parallel with a current detection pin of the current sensor, and divides the power supply current flowing from the power supply to the load module into two parts to realize the shunt of the power supply current;

the bypass shunt module has a known shunt ratio, and calculates an actual supply current provided by the power supply according to the shunt ratio and an output current value of the detection module.

Preferably, the device for expanding the detection range of the current sensor further comprises a current correction module;

the current correction module is arranged between the output end of the power supply and the detection module and is used for detecting the power supply current value output by the power supply;

the shunt ratio of the bypass shunt module is the ratio of the output current value of the detection module to the power supply current value output by the power supply.

Preferably, the device for expanding the detection range of the current sensor adjusts the shunt ratio of the bypass shunt module by adjusting the length and/or width of the copper-clad plane connected in parallel with the current detection pin of the current sensor.

Preferably, in the above apparatus for expanding the detection range of the current sensor, the detection module employs a hall current sensor.

Preferably, in the apparatus for expanding the detection range of the current sensor, the current correction module detects the supply current value output by the power supply by using an external ac/dc current clamp.

Preferably, in the device for expanding the detection range of the current sensor, the detection module and the bypass shunt module are arranged on the PCB together.

In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:

according to the device for expanding the detection range of the current sensor, the power bus current flowing through the load is shunted by adopting a PCB printed circuit shunt mode, so that the current actually flowing through the current sensor is reduced, the large current detection can be realized by adopting a small-range current sensor detection mode, the detection range of the current sensor is equivalently expanded, the purpose of detecting the large current by the small-range current sensor can be realized by combining an external current correction module, and the circuit cost and the volume are reduced. The scheme of shunting the PCB printed lines is adopted for shunting, a large number of discrete electronic devices are not needed, and the size and the cost of the current detection circuit are further reduced.

Drawings

Fig. 1 is a schematic structural diagram of a device for expanding a detection range of a current sensor according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a specific connection relationship between a bypass shunt module and a detection module according to an embodiment of the present invention;

in all the figures, the same reference numerals denote the same features, in particular: 1-a detection module; 2-a bypass shunt module; 3-a current correction module; 4-a power supply source; 5-a load module; 6-spreading a copper plane; 7-power bus.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

The following description is merely exemplary in nature and is not intended to limit the present invention, the application of the present invention, or the uses of the present invention. Further, the drawings are schematic, and the proportions of the respective dimensions and the like do not necessarily coincide with the actual situation.

Fig. 1 is a schematic structural diagram of a device for expanding a detection range of a current sensor according to this embodiment, and as shown in fig. 1, the device includes a detection module 1 and a bypass shunt module 2;

the input ends of the detection module 1 and the bypass shunt module 2 are respectively connected with the output end of the power supply source 4, and the output ends of the detection module 1 and the bypass shunt module 2 are respectively connected with the load module 5;

the bypass shunt module 2 is a copper laying plane 6 on the PCB, the copper laying plane 6 is arranged in parallel with a current detection pin of a current sensor, and divides a power supply current flowing from the power supply 4 to the load module 5 into two parts to realize the shunt of the power supply current;

the bypass shunt module has a known shunt ratio, and calculates the actual power supply current provided by the power supply according to the shunt ratio and the output current value of the detection module, so that the large current detection can be realized by adopting a small-range current sensor detection mode, and the circuit cost and the size are reduced.

The scheme adopts a PCB printed line shunting mode to shunt the power bus current flowing through the load, so that the current actually flowing through the current sensor is reduced, and the purpose of detecting the large current by the small-range current sensor can be realized by combining an external current correction module. The scheme of shunting the PCB printed lines is adopted for shunting, a large number of discrete electronic devices are not needed, and the size and the cost of the current detection circuit are further reduced.

In order to test the shunt ratio of the bypass shunt module 2, the device for expanding the detection range of the current sensor provided by the embodiment further comprises a current correction module 3;

the current correction module 3 is arranged between the output end of the power supply 4 and the detection module 1 and is used for detecting the current value of the power bus 7; the shunt ratio of the bypass shunt module 2 is the ratio of the output current value of the detection module 1 to the current value of the power bus 7.

When designing the PCB power amplifier board, through connecting in detection module 1 in series at the positive end of power supply 4, simultaneously, design bypass reposition of redundant personnel on the PCB power amplifier board and spread copper plane 6 and be parallelly connected with detection module 1's current detection pin 8, detection module 1 and bypass reposition of redundant personnel module 2's output join get into load module 5 to the realization is to the reposition of redundant personnel of power bus 7 through load current. The detection module 1 can be arranged on the PCB power amplifier board together with the bypass shunt module 2, and can also be arranged outside the PCB power amplifier board independently, which is not specifically limited in the present application. The shunt ratio of the bypass shunt module 2 can be adjusted by adjusting the length and/or the width of the copper paving plane 6 which is connected with the current detection pin 8 of the detection module 1 in parallel, and the implementation mode is simple and easy to realize. The thickness of the copper-clad surface 6 is not particularly limited in this embodiment.

As an alternative embodiment, the detection module 1 uses a hall current sensor, and the hall current sensor converts a current signal flowing through the hall current sensor into a corresponding voltage signal. The current correction module 3 detects the power supply current value output by the power supply 4 by using an external AC/DC current clamp.

In a specific implementation process, the total current I0 flowing through the power bus 7 is detected at the positive end of the external power bus 7 through an external ac/dc current clamp (e.g., an oscilloscope current clamp), the output voltage waveform of the hall current sensor is also monitored, the current value I1 flowing through the hall current sensor is obtained by dividing the amplitude of the monitored voltage waveform by the sensitivity coefficient of the hall current sensor, and then the shunt ratio K of the bypass shunt module 2 is calculated to be I1/I0, so that the current of the power bus 7 is corrected.

After the shunt ratio K is obtained, the actual current value on the power bus 7 can be obtained directly by multiplying the current value corresponding to the signal voltage output by the detection module 1 by the shunt ratio K.

In one specific example, the Hall current sensor in the detection module 1 may employ ACS714LLCTR-50A-T, by which current values within 50A may be detected. The bypass shunt module 2 adopts a printed wiring shunt PCB scheme shown in FIG. 2, and divides the current flowing through the load module 5 from the power plane of the power bus 7 into two parts, wherein one part directly enters the load module 5 through the printed wiring, and the other part enters the load module 5 after flowing through a pin of the Hall current sensor; the current correction module 3 samples the current of the power bus 7 by using an oscilloscope current clamp a621 in cooperation with a digital storage oscilloscope DPO 4054B.

Compared with the existing detection circuit, the device for expanding the detection range of the current sensor provided by the invention has the advantages that the power bus current flowing through the load is shunted by adopting a PCB printed circuit shunting way, so that the current actually flowing through the current sensor is reduced, the large current detection can be realized by adopting a small-range current sensor detection way, the purpose of detecting the large current by the small-range current sensor can be realized by combining an external current correction module, and the cost and the volume of the circuit are reduced. The scheme of shunting the PCB printed lines is adopted for shunting, a large number of discrete electronic devices are not needed, and the size and the cost of the current detection circuit are further reduced.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.