CN203595740U - Device for measuring currents in direct current system - Google Patents
Device for measuring currents in direct current system Download PDFInfo
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- CN203595740U CN203595740U CN201320717780.2U CN201320717780U CN203595740U CN 203595740 U CN203595740 U CN 203595740U CN 201320717780 U CN201320717780 U CN 201320717780U CN 203595740 U CN203595740 U CN 203595740U
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- current
- power supply
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- analog voltage
- measurement
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- 238000005070 sampling Methods 0.000 claims abstract description 35
- 238000005259 measurement Methods 0.000 claims abstract description 34
- 238000002955 isolation Methods 0.000 claims description 23
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000003321 amplification Effects 0.000 abstract 2
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The utility model provides a device for measuring currents in a direct current system. The device comprises current sampling units, emitter following buffer units, isolating power supplies, isolating amplification units, an analog voltage sampling unit and a system power supply. The quantity of the current sampling units, the emitter following buffer units, the isolating power supplies and the isolating amplification units and the quantity of channels of the analog voltage sampling unit are equal and greater than one, and all the channels are connected in the same manner, thereby achieving the measurement of multiple direct currents. The emitter buffer following buffer units are powered by the isolating power supplies, and the current sampling units are not in circuit connection with the analog voltage sampling unit, so that the isolated acquisition and measurement of multiple direct currents can be carried out.
Description
Technical field
The utility model relates to a kind of device of the current measurement for straight-flow system.More particularly, the utility model relates to a kind of device of the multiple spot current measurement for straight-flow system.
Background technology
In straight-flow system, for the object of measuring and controlling, need to measure the electric current of multiple spot.Common way is, by passage acquisition module, each measurement is sent to control module.Can adopt Hall element to carry out the contactless like this mode of current sampling and carry out current measurement, but there is the problem that precision is low in Hall mode.Also can adopt current-limiting resistance to carry out the higher method of the such measuring accuracy of current sampling, particularly for example, in large current system (rated current 50A or 100A and higher system).Current-limiting resistance mode samples the accurate measurement both can realize almost journey completely time, also can realize electric current accurate measurement very hour.
But, use current-limiting resistance to carry out current sampling to measure such mode and exist the inconsistent problem of reference potential of each measurement point, cannot directly use the sampling current of acquisition module.
Utility model content
The utility model is devoted to solve the problems referred to above relevant with prior art, provides a kind of multi channel currents measurement mechanism with isolation effect for straight-flow system.
The device of the described current measurement for straight-flow system comprises: current sampling unit, penetrate with buffer cell, insulating power supply, isolation amplifying unit, analog voltage collecting unit and system power supply.Wherein, described current sampling unit is made up of current sampling sensor, and input end is connected to DC current, and the current conversion of input is become to corresponding voltage; Described penetrating with the input end of buffer cell is connected with the output terminal of described current sampling unit; Described insulating power supply with described in penetrate with buffer cell and be connected, for described penetrating with buffer cell powered separately; The input end of described isolation amplifying unit with described in penetrate with the output terminal of buffer cell and be connected; One of them input end of described analog voltage collecting unit is connected with the output terminal of described isolation amplifying unit; Described system power supply respectively with described insulating power supply, described isolation amplifying unit, and described analog voltage collecting unit connects to provide power supply.Wherein, described current sampling unit, to penetrate with the number of buffer cell, buffer circuit and isolation amplifying unit and the number of active lanes of analog voltage collecting unit be multiple, their number equates, and the connected mode of each passage is identical, realizes the measurement to multiple DC current; And penetrating with between buffer cell and described current sampling unit and described analog voltage collecting unit of described insulating power supply power supply do not have electric loop to be connected.
Alternatively, the switch that described current sampling sensor is multiple series connection is in parallel with current-limiting resistance, by switching different described current-limiting resistances, can change measurement range.
Alternatively, the device of the described current measurement for straight-flow system has overcurrent protective device, and described overcurrent protective device is the isolating switch at current input terminal.
Alternatively; the device of the described current measurement for straight-flow system has communication bus; described communication bus is connected with described analog voltage collecting unit; data transfer, to Upper system, and is fed back to Upper system by the information that comprises normal operating conditions, outrange state and overcurrent protection state of described device.
The device of the current measurement for straight-flow system that the utility model proposes, adopts penetrating with buffer cell of power supply separately, and the electric loop of having eliminated between current sampling unit and analog voltage collecting unit is connected, and realizes collection and measurement to DC current isolation.
Method and apparatus of the present utility model has other characteristic and advantage, these characteristics and advantage will be apparent from the accompanying drawing that is incorporated herein and embodiment subsequently, or will in the accompanying drawing being incorporated herein and embodiment subsequently, state in detail, these the drawings and specific embodiments are jointly for explaining certain principles of the present utility model.
Accompanying drawing explanation
By including accompanying drawing herein in and being used from subsequently the embodiment of explanation some principle of the present utility model with accompanying drawing one, the further feature that device of the present utility model has and advantage will become clear or more specifically be illustrated.
Fig. 1 is according to the structural representation of the device of the current measurement for straight-flow system of the present utility model;
Reference numeral:
Penetrate with buffer cell 102...n02
Analog voltage collecting unit 6
Communication bus 7
Protective device 108...n08.
Embodiment
A lot of details are set forth in the following description so that fully understand the utility model.But the utility model can be implemented to be much different from alternate manner described here, those skilled in the art can do similar popularization without prejudice to the utility model intension in the situation that, and therefore the utility model is not subject to the restriction of following public specific embodiment.
As shown in Figure 1, comprise current sampling unit 101...n01, penetrate with buffer cell 102...n02, insulating power supply 103...n03, isolation amplifying unit 104...n04, system power supply 5, analog voltage collecting unit 6 according to the device of the current measurement for straight-flow system of the present utility model.
Wherein, analog voltage collecting unit 6 has n input port, each current sampling unit, penetrate with buffer cell, insulating power supply and isolation amplifying unit and form respectively a road current collecting device, be connected to one of them of n input port of analog voltage collecting unit 6, system power supply 5 is each branch road power supply.
Take first via current collecting device as example, it comprises current sampling unit 101, penetrates with buffer cell 102, insulating power supply 102, isolation amplifying unit 104, system power supply 5, analog voltage collecting unit 6.
DC current I1 enters this measurement mechanism from current sampling unit 101.Current sampling unit 101 is made up of current sampling sensor, and the switch that described current sampling sensor can be multiple series connection is in parallel with current-limiting resistance, by switching different current-limiting resistances, can change measurement range.
The output terminal of current sampling unit 101 is connected to an input end of penetrating with buffer cell 102.Penetrate with buffer cell 102 and there is its independent insulating power supply 103, play buffer compartment from effect.
Penetrate the input end that is connected to isolation amplifying unit 104 with the output terminal of buffer cell 102, to amplifying through the input voltage of isolation.
The output terminal of isolation amplifying unit 104 is connected to analog voltage collecting unit 6, and the isolation amplifying signal of output is offered to described analog voltage collecting unit 6.
Powered separately by insulating power supply 103 owing to penetrating with buffer cell 102, the electric loop of having eliminated between current sampling unit 101 and analog voltage collecting unit 6 is connected, and has therefore realized collection and measurement to DC current isolation.
Preferably there is overcurrent protective device 108 according to the device of the current measurement for straight-flow system of the present utility model ... n08, it can be the isolating switch at current input terminal.If when input current exceedes the scope of restriction, isolating switch disconnects circuit, there is no electric current input.
Preferably there is communication bus 7 according to the device of the current measurement for straight-flow system of the present utility model.Communication bus 7 is connected with analog voltage collecting unit 6, by the data transmission of measuring to Upper system, and can be by the various states of this device, comprise that the information of normal operating conditions, outrange state and overcurrent protection state feeds back to Upper system.
Visible, the device of the current measurement for straight-flow system as shown in Figure 1 can be realized collection and the measurement to multiple DC current, and wherein every road all has by insulating power supply penetrating with buffer cell of power supply separately, can realize collection and measurement to multiple DC current isolation.
Claims (4)
1. for a device for the current measurement of straight-flow system, it is characterized in that, described device comprises:
Current sampling unit, described current sampling unit is made up of current sampling sensor, and input end is connected to DC current, and the current conversion of input is become to corresponding voltage;
Penetrate with buffer cell, described in penetrate with the input end of buffer cell and be connected with the output terminal of described current sampling unit;
Insulating power supply, described insulating power supply with described in penetrate with buffer cell and be connected, for described penetrating with buffer cell powered separately;
Isolation amplifying unit, the input end of described isolation amplifying unit with described in penetrate with the output terminal of buffer cell and be connected;
Analog voltage collecting unit, one of them input end of described analog voltage collecting unit is connected with the output terminal of described isolation amplifying unit; And
System power supply, described system power supply respectively with described insulating power supply, described isolation amplifying unit, and described analog voltage collecting unit connects to provide power supply;
Wherein, described current sampling unit, to penetrate with the number of buffer cell, buffer circuit and isolation amplifying unit and the number of active lanes of analog voltage collecting unit be multiple, their number equates, and the connected mode of each passage is identical, realizes the measurement to multiple DC current; And penetrating with between buffer cell and described current sampling unit and described analog voltage collecting unit of described insulating power supply power supply do not have electric loop to be connected.
2. the device of the current measurement for straight-flow system according to claim 1, is characterized in that, the switch that described current sampling sensor is multiple series connection is in parallel with current-limiting resistance, changes measurement range by switching different described current-limiting resistances.
3. the device of the current measurement for straight-flow system according to claim 1, is characterized in that having overcurrent protective device, and described overcurrent protective device is the isolating switch at current input terminal.
4. the device of the current measurement for straight-flow system according to claim 1; it is characterized in that thering is communication bus; described communication bus is connected with described analog voltage collecting unit; data transfer, to Upper system, and is fed back to Upper system by the information that comprises normal operating conditions, outrange state and overcurrent protection state of described device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320717780.2U CN203595740U (en) | 2013-11-14 | 2013-11-14 | Device for measuring currents in direct current system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320717780.2U CN203595740U (en) | 2013-11-14 | 2013-11-14 | Device for measuring currents in direct current system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203595740U true CN203595740U (en) | 2014-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320717780.2U Expired - Fee Related CN203595740U (en) | 2013-11-14 | 2013-11-14 | Device for measuring currents in direct current system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203595740U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259403A (en) * | 2015-11-06 | 2016-01-20 | 上海大众汽车有限公司 | Special current test system and current switching method for vehicle information system test bench |
| CN114646837A (en) * | 2022-05-13 | 2022-06-21 | 湖南恩智测控技术有限公司 | Equipotential body signal measuring circuit, equipotential body signal measuring device and equipotential body signal measuring instrument |
-
2013
- 2013-11-14 CN CN201320717780.2U patent/CN203595740U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259403A (en) * | 2015-11-06 | 2016-01-20 | 上海大众汽车有限公司 | Special current test system and current switching method for vehicle information system test bench |
| CN114646837A (en) * | 2022-05-13 | 2022-06-21 | 湖南恩智测控技术有限公司 | Equipotential body signal measuring circuit, equipotential body signal measuring device and equipotential body signal measuring instrument |
| CN114646837B (en) * | 2022-05-13 | 2022-09-27 | 湖南恩智测控技术有限公司 | Equipotential body signal measuring circuit, device and measuring instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140514 |
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| CF01 | Termination of patent right due to non-payment of annual fee |