CN103575961B - A kind of boost rectifier transformer current sampling circuit - Google Patents
A kind of boost rectifier transformer current sampling circuit Download PDFInfo
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- CN103575961B CN103575961B CN201310555434.3A CN201310555434A CN103575961B CN 103575961 B CN103575961 B CN 103575961B CN 201310555434 A CN201310555434 A CN 201310555434A CN 103575961 B CN103575961 B CN 103575961B
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Abstract
The invention discloses a kind of boost rectifier transformer current sampling circuit, comprise the secondary commutation circuit being arranged on rectifier transformer secondary output end, the additional winding rectification circuit be connected with secondary commutation circuit connected in series and the current sampling circuit that rectifier transformer secondary output end electric current is sampled; The input end of additional winding rectification circuit is in series with the additional coiling group be coupled with transformer step-down, add and be also in series with current transformer primary coil between coiling group and the input end of additional winding rectification circuit, described current sampling circuit is provided with secondary transformer coil, the coupling of current transformer primary coil summation current transformer secondary coil is arranged, and the electric current that current sampling circuit is also provided with convection current excess current transformer secondaries carries out the sampling module of sampling.The present invention samples under lower pressure, and security is high, and accuracy is high, is applicable to production application.
Description
Technical field
The present invention relates to a kind of current sampling circuit, in particular a kind of boost rectifier transformer current sampling circuit for sampling to boost rectifier transformer secondary high pressure output end current.
Background technology
In actual production, the secondary output end voltage of boosting rectification type transformer is higher, and such as, transformer in electrostatic field fume eliminating apparatus, its secondary output end voltage can reach direct current several ten thousand volt.In order to monitor equipment working state, staff needs the actual working state of measuring transformer, will sample to the electric current of the output terminal of rectifier transformer.Traditional boost rectifier transformer current sampling circuit is generally sampled by the current return of the output terminal of sampling resistor series connection access transformer, but because the output end voltage of rectifier transformer is higher, sampling electrical quantity needs to use to loop control logic after isolation again, or with Hall element, isolation sampling is carried out to output current, these methods all can make the high or electrical quantity distortion of cost, and there is potential safety hazard.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The object of the present invention is to provide a kind of boost rectifier transformer current sampling circuit, be intended to solve that traditional sample circuit peace cost is high, degree of distortion high-technology problem.
Technical scheme of the present invention is as follows: a kind of boost rectifier transformer current sampling circuit, comprise the secondary commutation circuit being arranged on rectifier transformer secondary output end, wherein, the additional winding rectification circuit be connected with secondary commutation circuit connected in series is also comprised and 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 be coupled with transformer step-down, current transformer primary coil is also in series with between described additional coiling group and the input end of additional winding rectification circuit, described current sampling circuit is provided with secondary transformer coil, the coupling of described current transformer primary coil summation current transformer secondary coil is arranged, and the electric current that described current sampling circuit is also provided with convection current excess current transformer secondaries carries out the sampling module of sampling.
Described boost rectifier transformer current sampling circuit, wherein, positive polarity after described secondary commutation circuit rectifies connects the voltage negative pole after additional winding rectifier circuit rectifies, voltage negative pole external load after secondary commutation circuit rectifies, the positive polarity ground connection after additional winding rectifier circuit rectifies.
Described boost rectifier transformer current sampling circuit, wherein, voltage negative pole after described secondary commutation circuit rectifies connects the positive polarity after additional winding rectifier circuit rectifies, positive polarity external load after secondary commutation circuit rectifies, the voltage minus earth after additional winding rectifier circuit rectifies.
Described boost rectifier transformer current sampling circuit, wherein, the turn ratio of described additional coiling group and primary coil is 3:5.
Described boost rectifier transformer current sampling circuit, wherein, the turn ratio of described current transformer primary coil and secondary transformer coil is 1:1.
Described boost rectifier transformer current sampling circuit, wherein, the number of turn of described current transformer primary coil and secondary transformer coil is 12 circles.
Described boost rectifier transformer current sampling circuit, wherein, the diode in described secondary commutation circuit adopts high-voltage diode.
Described boost rectifier transformer current sampling circuit, wherein, the diode in described additional winding rectification circuit adopts low pressure diode.
Beneficial effect of the present invention: the present invention is by arranging an additional coiling group and utilizing additional winding rectification circuit to carry out rectification at rectifier transformer, the secondary commutation circuit in the secondary high pressure output terminal of current sample is needed by rectifier transformer to be connected in series with additional winding rectification circuit (electric current that is flowing through secondary high pressure output terminal is identical with the electric current flowing through additional winding rectification circuit) again, recycling electromagnetic coupled outputs to current sample module after being isolated by the electric current of additional winding, realize sampling to secondary high pressure output terminal, reach the effect of indirectly secondary high pressure output terminal being sampled, the present invention is by arranging an additional coiling group be 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 also can not potential safety hazard be there is to its sampling, make sample circuit work in a low voltage state, security improves greatly, the present invention passes through in additional winding and additional winding rectification circuit series current primary winding of mutual inductor, and the secondary transformer coil be coupled with current transformer primary coil is set, the electric current of recycling sampling module convection current excess current transformer secondaries is sampled, realize sampling module to isolate with the high-tension current that need sample and sample, and cost is low, distortion is little.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of bridge rectifier circuit.
Fig. 2 is the circuit diagram of boost rectifier transformer current sampling circuit of the present invention.
Fig. 3 is the oscillogram of boost rectifier transformer secondary high pressure output terminal of the present invention.
Fig. 4 is the oscillogram of current transformer primary coil L4 of the present invention.
Fig. 5 is the oscillogram of secondary transformer coil L5 of the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.
As shown in Figure 1, be the circuit diagram of bridge rectifier circuit, comprise input end 100, the voltage negative pole 210 after rectification and the positive polarity 220 after rectification.
The invention discloses a kind of boost rectifier transformer current sampling circuit, as shown in Figure 2, comprise the secondary commutation circuit 410 being arranged on boost rectifier transformer secondary output end, the additional winding rectification circuit 510 be 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) be made up of diode D1, D2, D3 and D4, and additional winding rectification circuit 510 is the bridge rectifier circuit (identical with Fig. 1) be made up 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 secondary commutation circuit 410 rectification externally exports negative high voltage, positive polarity after secondary commutation circuit 410 rectification connects the voltage negative pole after additional winding rectification circuit 510 rectification, and the positive polarity ground connection after additional winding rectification circuit 510 rectification, realize being connected in series of secondary commutation circuit 410 and additional winding rectification circuit 510, secondary commutation circuit 410 superposes with the output voltage of additional winding rectification circuit 510 and arranges, by this connected mode, realize secondary commutation circuit 410 consistent with the electric current in additional winding rectification circuit 510, ensure that the accuracy that the present invention samples.
In practical application, arrange to ensure that secondary commutation circuit 410 superposes with the output voltage of additional winding rectification circuit 510, also following connected mode can be adopted: the voltage negative pole after secondary commutation circuit 410 rectification connects the positive polarity after additional winding rectification circuit 510 rectification, positive polarity external load after secondary commutation circuit 410 rectification, the voltage minus earth after additional winding rectification circuit 510 rectification.
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 be coupled with rectifier transformer primary coil L1 step-down, the present invention is by adopting the additional coiling group L3 be coupled with rectifier transformer primary coil L1 step-down, make additional winding rectification circuit 510 under environment under low pressure, work (operating voltage is generally below 110V), thus realize sampling under lower pressure, substantially increase the security of sampling.
Further, in the present embodiment, add and be also in series with current transformer primary coil L4 between coiling group L3 and the input end of additional winding rectification circuit 510, current sampling circuit is provided with secondary transformer coil L5, current transformer primary coil L4 summation current transformer secondary coil L5 is coupled setting, and the electric current that current sampling circuit is also provided with convection current excess current transformer secondaries L5 carries out the sampling module 600 of sampling.Because current transformer primary coil L4 summation current transformer secondary coil L5 is that electromagnetic coupled is arranged, 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, the electric current of sampling module 600 convection current excess current transformer secondaries L5 is sampled, achieve and isolation sampling is carried out to the electric current of rectifier transformer secondary high pressure output terminal, therefore the result accuracy utilizing the present invention 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, secondary transformer coil L5 is connected with the input end two ends of sampling rectification circuit, and the output terminal after sampling rectifier circuit rectifies 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 electric current and convert voltage output to, 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 secondary transformer coil L5 is 1:1.Concrete, under the prerequisite that wananty costs is lower, find through test of many times, when the number of turn of current transformer primary coil L4 and secondary transformer coil L5 is 12 circle, security of the present invention 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, present invention achieves and accurately rectifier transformer secondary high pressure output end current is sampled at low cost under lower pressure, reach the technique effect of Real-Time Monitoring rectifier transformer duty, as Fig. 3, shown in Fig. 4 and Fig. 5, the oscillogram of rectifier transformer secondary high pressure output terminal respectively, 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 invention is undistorted to be copied to transfer in sample circuit by the current characteristics of rectifier transformer secondary high pressure output terminal and samples under lower pressure, 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 invention, high security and high accuracy, be particularly suitable for sampling to the secondary high pressure output current of booster type rectifier transformer, such as, the secondary high pressure output current of the rectifier transformer of large-scale static flue gas removing equipment sampled.In the present embodiment, the connected mode of each circuit is optimum connected mode, and this boost rectifier transformer current sampling circuit is under the prerequisite guaranteeing security and the accuracy of sampling, and used component number is few, and production cost is low, and is particularly suitable for manufacturing.
Should be understood that, application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (8)
1. a boost rectifier transformer current sampling circuit, comprise the secondary commutation circuit being arranged on rectifier transformer secondary output end, it is characterized in that, also comprise the additional winding rectification circuit be connected with secondary commutation circuit connected in series 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 be coupled with transformer step-down, current transformer primary coil is also in series with between described additional coiling group and the input end of additional winding rectification circuit, described current sampling circuit is provided with secondary transformer coil, the coupling of described current transformer primary coil summation current transformer secondary coil is arranged, and the electric current that described current sampling circuit is also provided with convection current excess current transformer secondaries carries out the sampling module of sampling.
2. boost rectifier transformer current sampling circuit according to claim 1, it is characterized in that, positive polarity after described secondary commutation circuit rectifies connects the voltage negative pole after additional winding rectifier circuit rectifies, voltage negative pole external load after secondary commutation circuit rectifies, the positive polarity ground connection after additional winding rectifier circuit rectifies.
3. boost rectifier transformer current sampling circuit according to claim 1, it is characterized in that, voltage negative pole after described secondary commutation circuit rectifies connects the positive polarity after additional winding rectifier circuit rectifies, positive polarity external load after secondary commutation circuit rectifies, the voltage minus earth after additional winding rectifier circuit rectifies.
4. the boost rectifier transformer current sampling circuit according to claim 1-3 any one, is characterized in that, the turn ratio of described additional coiling group and primary coil is 3:5.
5. the boost rectifier transformer current sampling circuit according to claim 1-3 any one, is characterized in that, the turn ratio of described current transformer primary coil and secondary transformer coil is 1:1.
6. boost rectifier transformer current sampling circuit according to claim 5, is characterized in that, the number of turn of described current transformer primary coil and secondary transformer coil is 12 circles.
7. the boost rectifier transformer current sampling circuit according to claim 1-3 any one, is characterized in that, the diode in described secondary commutation circuit adopts high-voltage diode.
8. the boost rectifier transformer current sampling circuit according to claim 1-3 any one, is characterized in that, the diode in described additional winding rectification circuit adopts low pressure diode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310555434.3A CN103575961B (en) | 2013-11-11 | 2013-11-11 | A kind of boost rectifier transformer current sampling circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310555434.3A CN103575961B (en) | 2013-11-11 | 2013-11-11 | A kind of boost rectifier transformer current sampling circuit |
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| CN103575961A CN103575961A (en) | 2014-02-12 |
| CN103575961B true CN103575961B (en) | 2016-01-06 |
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| CN105807117B (en) * | 2014-12-29 | 2020-01-31 | 苏州普源精电科技有限公司 | Current sensing circuit for current measuring probe and current measuring probe thereof |
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| GB541627A (en) * | 1940-05-30 | 1941-12-04 | Kapella Ltd | Improvements in or relating to electrical measuring apparatus |
| CN201293832Y (en) * | 2008-11-11 | 2009-08-19 | 河南平高电气股份有限公司 | Test device for multifunctional current transformer |
| CN103280959A (en) * | 2013-05-20 | 2013-09-04 | 广州视源电子科技股份有限公司 | Synchronous rectifying circuit for switching power supply converter |
| CN203561673U (en) * | 2013-11-11 | 2014-04-23 | 佛山市科蓝环保科技股份有限公司 | Boosting rectification transformer current sampling circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5731902B2 (en) * | 2011-05-20 | 2015-06-10 | 河村電器産業株式会社 | Earth leakage breaker |
| JP6062234B2 (en) * | 2012-01-13 | 2017-01-18 | 東芝メディカルシステムズ株式会社 | Power supply circuit and magnetic resonance imaging apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB541627A (en) * | 1940-05-30 | 1941-12-04 | Kapella Ltd | Improvements in or relating to electrical measuring apparatus |
| CN201293832Y (en) * | 2008-11-11 | 2009-08-19 | 河南平高电气股份有限公司 | Test device for multifunctional current transformer |
| CN103280959A (en) * | 2013-05-20 | 2013-09-04 | 广州视源电子科技股份有限公司 | Synchronous rectifying circuit for switching power supply converter |
| CN203561673U (en) * | 2013-11-11 | 2014-04-23 | 佛山市科蓝环保科技股份有限公司 | Boosting rectification transformer current sampling circuit |
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