CN203561673U - Boosting rectification transformer current sampling circuit - Google Patents
Boosting rectification transformer current sampling circuit Download PDFInfo
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- CN203561673U CN203561673U CN201320706583.0U CN201320706583U CN203561673U CN 203561673 U CN203561673 U CN 203561673U CN 201320706583 U CN201320706583 U CN 201320706583U CN 203561673 U CN203561673 U CN 203561673U
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Abstract
The utility model discloses a boosting rectification transformer current sampling circuit. The circuit comprises a secondary rectification circuit arranged on a rectification transformer secondary output terminal, an additional winding rectification circuit connected in series with the secondary rectification circuit and a current sampling circuit which carries out sampling on a rectification transformer secondary output terminal current. An input terminal of the additional winding rectification circuit is connected in series with an additional winding group forms voltage reduction coupling with a transformer primary coil. A current transformer primary coil is connected in series between the additional winding group and the input terminal of the additional winding rectification circuit. The current sampling circuit is provided with a current transformer secondary coil. The current transformer primary coil is coupled with the current transformer secondary coil. The current sampling circuit is provided with a sampling module which is used to sample a current flowing through the current transformer secondary coil. The circuit of the utility model carries out sampling under a low voltage condition. Security is high and accuracy is high. The circuit is suitable for production and application.
Description
Technical field
The utility model relates to a kind of current sampling circuit, in particular a kind of rectifier transformer current sampling circuit that boosts for the rectifier transformer secondary high pressure output end current that boosts is sampled.
Background technology
In actual production, the secondary output end voltage of the rectification type transformer that boosts is higher, for example transformer in electrostatic field fume eliminating apparatus, and its secondary output end voltage can reach direct current several ten thousand volts.For equipment working state is monitored, staff needs the actual working state of measuring transformer, will sample to the electric current of the output terminal of rectifier transformer.Traditional rectifier transformer current sampling circuit that boosts is generally that the current return of the output terminal of sampling resistor series connection access transformer is sampled, but because the output end voltage of rectifier transformer is higher, sampling electrical quantity need to be used to loop control logic after isolation again, or output current is isolated to sampling with Hall element, these methods all can make the high or electrical quantity distortion of cost, and have potential safety hazard.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The purpose of this utility model is to provide the one rectifier transformer current sampling circuit that boosts, and is intended to solve that traditional sample circuit peace cost is high, degree of distortion high-technology problem.
The technical solution of the utility model is as follows: the one rectifier transformer current sampling circuit that boosts, comprise the secondary commutation circuit that is arranged on rectifier transformer secondary output end, wherein, also comprise the additional winding rectification circuit being connected in series with secondary commutation circuit and the current sampling circuit that rectifier transformer secondary output end electric current is sampled;
The input end of described additional winding rectification circuit is in series with the additional coiling group with transformer step-down coupling, between described additional coiling group and the input end of additional winding rectification circuit, be also in series with current transformer primary coil, on described current sampling circuit, be provided with current transformer secondary coil, described current transformer primary coil summation current transformer secondary coil coupling arranges, and described current sampling circuit is also provided with the sampling module that the electric current of current flowing mutual inductor secondary coil is sampled.
The described rectifier transformer current sampling circuit that boosts, wherein, positive polarity after the rectification of described secondary commutation circuit connects the voltage negative pole after additional winding rectification circuit rectification, voltage negative pole external load after the rectification of secondary commutation circuit, the positive polarity ground connection after additional winding rectification circuit rectification.
The described rectifier transformer current sampling circuit that boosts, wherein, voltage negative pole after the rectification of described secondary commutation circuit connects the positive polarity after additional winding rectification circuit rectification, positive polarity external load after the rectification of secondary commutation circuit, the voltage minus earth after additional winding rectification circuit rectification.
The described rectifier transformer current sampling circuit that boosts, wherein, the turn ratio of described additional coiling group and primary coil is 3:5.
The described rectifier transformer current sampling circuit that boosts, wherein, the turn ratio of described current transformer primary coil and current transformer secondary coil is 1:1.
The described rectifier transformer current sampling circuit that boosts, wherein, the number of turn of described current transformer primary coil and current transformer secondary coil is 12 circles.
The described rectifier transformer current sampling circuit that boosts, wherein, the diode in described secondary commutation circuit adopts high-voltage diode.
The described rectifier transformer current sampling circuit that boosts, wherein, the diode in described additional winding rectification circuit adopts low pressure diode.
The beneficial effects of the utility model: the utility model is by arranging an additional coiling group and utilizing additional winding rectification circuit to carry out rectification at rectifier transformer, again rectifier transformer is needed secondary commutation circuit in the secondary high pressure output terminal of current sample to be connected in series (that is to say flow through the electric current of secondary high pressure output terminal identical with the electric current that flows through additional winding rectification circuit) with additional winding rectification circuit, recycling electromagnetic coupled will output to current sample module after the electric current isolation of additional winding, realization is sampled to secondary high pressure output terminal, reach the effect of indirectly secondary high pressure output terminal being sampled, the utility model is by arranging an additional coiling group being coupled with the step-down of rectifier transformer primary coil at the input end of additional winding rectification circuit, make the voltage in additional winding rectification circuit lower, even if directly can there is not potential safety hazard to its sampling yet, sample circuit is operated under low-pressure state, and security improves greatly, the utility model passes through in additional winding and additional winding rectification circuit series current primary winding of mutual inductor, and the current transformer secondary coil of setting and the coupling of current transformer primary coil, recycling sampling module is sampled to the electric current of current flowing mutual inductor secondary coil, realize sampling module and the high-tension current isolation sampling that needs sampling, and cost is low, distortion is little.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of bridge rectifier circuit.
Fig. 2 is the boost circuit diagram of rectifier transformer current sampling circuit of the utility model.
Fig. 3 is the boost oscillogram of rectifier transformer secondary high pressure output terminal of the utility model.
Fig. 4 is the oscillogram of the utility model current transformer primary coil L4.
Fig. 5 is the oscillogram of the utility model current transformer secondary coil L5.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, clear and definite, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.
As shown in Figure 1, be the circuit diagram of bridge rectifier circuit, comprise input end 100, the positive polarity 220 after voltage negative pole 210 and rectification after rectification.
The utility model discloses the one rectifier transformer current sampling circuit that boosts, as shown in Figure 2, comprise the secondary commutation circuit 410 that is arranged on the rectifier transformer secondary output end that boosts, the additional winding rectification circuit 510 being connected in series with secondary commutation circuit 410 and the current sampling circuit that rectifier transformer secondary output end electric current is sampled; Wherein, secondary commutation circuit 410 is the bridge rectifier circuit (identical with Fig. 1) being comprised of diode D1, D2, D3 and D4, and additional winding rectification circuit 510 is the bridge rectifier circuit (identical with Fig. 1) being comprised of diode D5, D6, D7 and D8.
In the present embodiment, the input end of secondary commutation circuit 410 connects secondary coil L2, voltage negative pole after 410 rectifications of secondary commutation circuit is externally exported negative high voltage, positive polarity after 410 rectifications of secondary commutation circuit connects the voltage negative pole after additional winding rectification circuit 510 rectifications, and the positive polarity ground connection after additional winding rectification circuit 510 rectifications, realize being connected in series of secondary commutation circuit 410 and additional winding rectification circuit 510, secondary commutation circuit 410 arranges with the output voltage stack of additional winding rectification circuit 510, by this connected mode, realize secondary commutation circuit 410 consistent with the electric current in additional winding rectification circuit 510, guaranteed the accuracy of the utility model sampling.
In practical application, in order to guarantee that secondary commutation circuit 410 and the output voltage stack of additional winding rectification circuit 510 arrange, also can adopt following connected mode: the voltage negative pole after 410 rectifications of secondary commutation circuit connects the positive polarity after additional winding rectification circuit 510 rectifications, positive polarity external load after 410 rectifications of secondary commutation circuit, the voltage minus earth after additional winding rectification circuit 510 rectifications.
In actual production, in order to improve the security of sampling process, the input end of additional winding rectification circuit 510 is in series with the additional coiling group L3 with rectifier transformer primary coil L1 step-down coupling, the utility model is by adopting the additional coiling group L3 being coupled with rectifier transformer primary coil L1 step-down, make additional winding rectification circuit 510 work (operating voltage is generally below 110V) under environment under low pressure, thereby realize, under low pressure condition, sample, greatly improved the security of sampling.
Further, in the present embodiment, between additional coiling group L3 and the input end of additional winding rectification circuit 510, be also in series with current transformer primary coil L4, on current sampling circuit, be provided with current transformer secondary coil L5, the current transformer primary coil L4 summation current transformer secondary coil L5 setting that is coupled, current sampling circuit is also provided with the sampling module 600 that the electric current of current flowing mutual inductor secondary coil L5 is sampled.Due to current transformer primary coil L4 summation current transformer secondary coil, L5 is electromagnetic coupled setting, electrical quantity linear relationship between L4 and L5 is good, and the electric current on current transformer primary coil L4 is identical with the electric current of transformer secondary output high-voltage output end, that is to say, sampling module 600 is sampled to the electric current of current flowing mutual inductor secondary coil L5, realized the electric current of rectifier transformer secondary high pressure output terminal has been isolated to sampling, therefore the result accuracy of utilizing the utility model to sample to obtain is high, security is good, be conducive to the duty that staff understands rectifier transformer real-time and accurately.
In actual applications, sampling module 600 can be provided with sampling rectification circuit.Concrete, current transformer secondary coil L5 is connected with the input end two ends of sampling rectification circuit, and the output terminal after the rectification of sampling rectification circuit connects sampling resistor, sampling resistor is parallel with filter capacitor, sampling resistor one end ground connection, the other end connects voltage sample end, externally exports sampled signal.By this setup, make to be sampled current conversion and become Voltage-output, be more easy to staff to data analysis, understand the actual working state of rectifier transformer.
In the present embodiment, the turn ratio of additional coiling group L3 and primary coil L1 is 3:5.
In the present embodiment, the turn ratio of current transformer primary coil L4 and current transformer secondary coil L5 is 1:1.Concrete, under the lower prerequisite of wananty costs, through test of many times, find, when the number of turn of current transformer primary coil L4 and current transformer secondary coil L5 is 12 circle, security of the present utility model and accuracy the best.
In the present embodiment, diode D1, D2, D3 and D4 in secondary commutation circuit 410 adopt high-voltage diode.
In the present embodiment, the diode in additional winding rectification circuit 510 all adopts low pressure diode.
By the connected mode of above-mentioned each circuit, the utility model has been realized and in low pressure condition, has been bent down into this locality and accurately rectifier transformer secondary high pressure output end current is sampled, reach the technique effect of Real-Time Monitoring rectifier transformer duty, as Fig. 3, shown in Fig. 4 and Fig. 5, it is respectively the oscillogram of rectifier transformer secondary high pressure output terminal, the oscillogram at the oscillogram summation current transformer secondary coil L5 place at current transformer primary coil L4 place, can see, circuit of the present utility model is undistorted to be copied the current characteristics of rectifier transformer secondary high pressure output terminal in transferring to sample circuit and samples under low pressure condition, reach the technique effect that rectifier transformer secondary high pressure DC output end is sampled of safety and precise.Due to low cost of the present utility model, high security and high accuracy, be particularly suitable for the secondary high pressure output current of booster type rectifier transformer to sample, the secondary high pressure output current of for example rectifier transformer to large-scale static flue gas removing equipment is sampled.In the present embodiment, the connected mode of each circuit is optimum connected mode, and this rectifier transformer current sampling circuit that boosts is guaranteeing that under the security of sampling and the prerequisite of accuracy, component number used is few, and production cost is low, and is particularly suitable for manufacturing.
Should be understood that; application of the present utility model is not limited to above-mentioned giving an example; for those of ordinary skills, can be improved according to the above description or convert, all these improvement and conversion all should belong to the protection domain of the utility model claims.
Claims (8)
1. the rectifier transformer current sampling circuit that boosts, comprise the secondary commutation circuit that is arranged on rectifier transformer secondary output end, it is characterized in that, also comprise the additional winding rectification circuit being connected in series with secondary commutation circuit and the current sampling circuit that rectifier transformer secondary output end electric current is sampled;
The input end of described additional winding rectification circuit is in series with the additional coiling group with transformer step-down coupling, between described additional coiling group and the input end of additional winding rectification circuit, be also in series with current transformer primary coil, on described current sampling circuit, be provided with current transformer secondary coil, described current transformer primary coil summation current transformer secondary coil coupling arranges, and described current sampling circuit is also provided with the sampling module that the electric current of current flowing mutual inductor secondary coil is sampled.
2. the rectifier transformer current sampling circuit that boosts according to claim 1, it is characterized in that, positive polarity after the rectification of described secondary commutation circuit connects the voltage negative pole after additional winding rectification circuit rectification, voltage negative pole external load after the rectification of secondary commutation circuit, the positive polarity ground connection after additional winding rectification circuit rectification.
3. the rectifier transformer current sampling circuit that boosts according to claim 1, it is characterized in that, voltage negative pole after the rectification of described secondary commutation circuit connects the positive polarity after additional winding rectification circuit rectification, positive polarity external load after the rectification of secondary commutation circuit, the voltage minus earth after additional winding rectification circuit rectification.
4. according to the rectifier transformer current sampling circuit that boosts described in claim 1-3 any one, it is characterized in that, the turn ratio of described additional coiling group and primary coil is 3:5.
5. according to the rectifier transformer current sampling circuit that boosts described in claim 1-3 any one, it is characterized in that, the turn ratio of described current transformer primary coil and current transformer secondary coil is 1:1.
6. the rectifier transformer current sampling circuit that boosts according to claim 5, is characterized in that, the number of turn of described current transformer primary coil and current transformer secondary coil is 12 circles.
7. according to the rectifier transformer current sampling circuit that boosts described in claim 1-3 any one, it is characterized in that, the diode in described secondary commutation circuit adopts high-voltage diode.
8. according to the rectifier transformer current sampling circuit that boosts described in claim 1-3 any one, it is characterized in that, the diode in described additional winding rectification circuit adopts low pressure diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320706583.0U CN203561673U (en) | 2013-11-11 | 2013-11-11 | Boosting rectification transformer current sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320706583.0U CN203561673U (en) | 2013-11-11 | 2013-11-11 | Boosting rectification transformer current sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203561673U true CN203561673U (en) | 2014-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320706583.0U Withdrawn - After Issue CN203561673U (en) | 2013-11-11 | 2013-11-11 | Boosting rectification transformer current sampling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203561673U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575961A (en) * | 2013-11-11 | 2014-02-12 | 佛山市科蓝环保科技股份有限公司 | Current sampling circuit of boost rectifier transformer |
| CN105591585A (en) * | 2014-11-04 | 2016-05-18 | 海信（山东）空调有限公司 | Speed adjusting apparatus of AC motor, AC motor, and electrical device |
-
2013
- 2013-11-11 CN CN201320706583.0U patent/CN203561673U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575961A (en) * | 2013-11-11 | 2014-02-12 | 佛山市科蓝环保科技股份有限公司 | Current sampling circuit of boost rectifier transformer |
| CN103575961B (en) * | 2013-11-11 | 2016-01-06 | 佛山市科蓝环保科技股份有限公司 | A kind of boost rectifier transformer current sampling circuit |
| CN105591585A (en) * | 2014-11-04 | 2016-05-18 | 海信（山东）空调有限公司 | Speed adjusting apparatus of AC motor, AC motor, and electrical device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140423 Effective date of abandoning: 20160106 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |