CN201697955U - Isolated AC sampler - Google Patents
Isolated AC sampler Download PDFInfo
- Publication number
- CN201697955U CN201697955U CN2010201604843U CN201020160484U CN201697955U CN 201697955 U CN201697955 U CN 201697955U CN 2010201604843 U CN2010201604843 U CN 2010201604843U CN 201020160484 U CN201020160484 U CN 201020160484U CN 201697955 U CN201697955 U CN 201697955U
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- CN
- China
- Prior art keywords
- shunt
- alternating current
- sampling thief
- current sampling
- voltage transformer
- 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.)
- Expired - Fee Related
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- Transformers For Measuring Instruments (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model relates to an isolated AC sampler, which mainly comprises a shunt, wherein a voltage mutual inductor is arranged on a lead-out wire of the shunt; a loop is formed by the voltage mutual inductor and a load resistance; and the two ends of the load resistance are provided with load lead-out wires. The structure has the characteristics that the voltage drops by the shunt when current flows past the shunt, and then the voltage mutual inductor transmits the dropped voltage onto an isolated load, thereby effectively reducing the volume of the overall current sampler and having the characteristic of electrical isolation.
Description
Technical field
The utility model relates to a kind of alternating current sampling thief of the components and parts of measuring electric current, particularly a kind of isolation.
Background technology
Existing alternating current sampling thief mainly divides two kinds, and a kind of main element is the low resistance shunt of pure resistance.Alternative main element is the current transformer of ribbon core coil.The measuring element of pure resistance exists current return and the electric problem that can not isolate of measuring unit, poor stability, antijamming capability weakness.And there is the saturated problem in magnetic field in the measuring element that makes Current Transformer, particularly when needs are measured big electric current, needs the current transformer of large volume to come ratio to reduce the measurement electric current, makes measuring appliance cost straight line rise.
The utility model content
The purpose of this utility model is to provide a kind of volume little for the deficiency that solves above-mentioned technology, and cost is low, and security performance is good, and antijamming capability is strong, the alternating current sampling thief that sampling numerical value is isolated accurately.
In order to achieve the above object, the alternating current sampling thief of the isolation that the utility model is designed mainly comprises shunt, on the extension line of shunt voltage transformer (VT) is set, voltage transformer (VT) and pull-up resistor are formed the loop, and at the pull-up resistor two ends load extension line are set.The characteristics of this structure are voltage drops when obtaining electric current and flow through shunt by shunt, this pressure drop are sent in the load of isolation by voltage transformer (VT) again, can effectively reduce the volume of whole current sampler, also have the characteristics of electrical isolation simultaneously.
In order to guarantee and the safety of sampling thief connection device, two pull-up resistors can be set, earth terminal is set between pull-up resistor, form a balancing circuitry.
Further scheme is: described shunt is by adopting less than 1m Ω, and temperature coefficient constitutes less than copper-manganese or the constantan material of 50ppm.Described voltage transformer (VT) is made up of the coil of ribbon core or magnetic core, and wherein coil has two groups.Such design can effectively guarantee the precision of sampling, and reduces the volume of sampling thief.
The alternating current sampling thief of the resulting isolation of the utility model, shunt and voltage transformer (VT) are organically combined, be sent on the pull-up resistor the voltage drop of shunt is pro rata by voltage transformer (VT), the voltage transformer (VT) characteristics have effectively been utilized simultaneously, sample circuit and sampling output circuit are isolated, increased the safety in utilization of the alternating current sampling thief of isolating greatly.On the other hand, the use of shunt reduces the volume of adaptive voltage transformer (VT) greatly.In sum, the alternating current sampling thief of the isolation that the utility model obtains combines the advantage of two kinds of main on existing market current samplers, has overcome their shortcoming, it is little to have volume, and security performance is good, and antijamming capability is strong, characteristics such as sampling accurately, and is applied widely, and production cost is low.
Description of drawings
Fig. 1 is the utility model embodiment 1 circuit structure diagram;
Fig. 2 is the utility model embodiment 2 circuit structure diagrams.
Embodiment
The utility model will be further described in conjunction with the accompanying drawings below by embodiment.
Embodiment 1:
As shown in Figure 1, the alternating current sampling thief of the isolation that present embodiment is described mainly comprises shunt 1, and voltage transformer (VT) 2 is set on the extension line of shunt, and voltage transformer (VT) 2 is formed the loop with pull-up resistor 3, and at the pull-up resistor two ends load extension line 4 is set.Wherein said shunt 1 is that resistance is 0.9m Ω, and temperature coefficient is the low resistivity value resistor that the copper-manganese of 49ppm constitutes, and voltage transformer (VT) 2 is made up of iron core and two groups of coils.During use, the load extension line 4 at pull-up resistor 3 two ends is supplied with metering circuit with the voltage at pull-up resistor 3 two ends.
Embodiment 2
As shown in Figure 2, the alternating current sampling thief of the isolation that present embodiment is described, its described shunt 1 is that resistance is 100v Ω, and temperature coefficient is the low resistivity value resistor that the constantan of 25ppm constitutes, and voltage transformer (VT) 2 is made up of magnetic core and two groups of coils.And its pull-up resistor 3 is two resistance, is provided with earth terminal 5 between two resistance.
Embodiment 3
The alternating current sampling thief of the isolation that present embodiment is described, its described shunt 1 is that resistance is 300v Ω, temperature coefficient is the low resistivity value resistor that the constantan of 25ppm constitutes.
Claims (5)
1. the alternating current sampling thief of an isolation mainly comprises shunt, it is characterized in that on the extension line of shunt voltage transformer (VT) being set, and voltage transformer (VT) and pull-up resistor are formed the loop, and at the pull-up resistor two ends load extension line is set.
2. the alternating current sampling thief of isolation according to claim 1 is characterized in that described pull-up resistor has two, is provided with earth terminal between two load electricity groups.
3. the alternating current sampling thief of isolation according to claim 1 and 2 is characterized in that described shunt by adopting less than 1m Ω, and temperature coefficient constitutes less than copper-manganese or the constantan material of 50ppm.
4. the alternating current sampling thief of isolation according to claim 1 and 2 is characterized in that described voltage transformer (VT) is made up of the coil of ribbon core or magnetic core, and wherein coil has two groups.
5. the alternating current sampling thief of isolation according to claim 3 is characterized in that described voltage transformer (VT) is made up of the coil of ribbon core or magnetic core, and wherein coil has two groups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201604843U CN201697955U (en) | 2010-04-15 | 2010-04-15 | Isolated AC sampler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201604843U CN201697955U (en) | 2010-04-15 | 2010-04-15 | Isolated AC sampler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201697955U true CN201697955U (en) | 2011-01-05 |
Family
ID=43399202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201604843U Expired - Fee Related CN201697955U (en) | 2010-04-15 | 2010-04-15 | Isolated AC sampler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201697955U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372470A (en) * | 2014-08-18 | 2016-03-02 | 辽宁电能发展股份有限公司 | AC current filtering and sampling circuit of photovoltaic inverter |
-
2010
- 2010-04-15 CN CN2010201604843U patent/CN201697955U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372470A (en) * | 2014-08-18 | 2016-03-02 | 辽宁电能发展股份有限公司 | AC current filtering and sampling circuit of photovoltaic inverter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: ZHEJIANG YONGTAILONG ELECTRONIC CO., LTD. Free format text: FORMER NAME: ZHEJIANG YONGTAILONG ELECTRONICS CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 314500, No. 8, Kangding Road, Tongxiang Economic Development Zone, Indus street, Tongxiang, Zhejiang, Jiaxing Patentee after: Zhejiang Yongtailong Electronic Co., Ltd. Address before: No. 8, Kangding Road, Tongxiang economic and Technological Development Zone, Jiaxing, Zhejiang Patentee before: Zhejiang Yongtailong Electronics Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110105 Termination date: 20190415 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |