CN203691250U - Small-size high-voltage isolation transformer - Google Patents
Small-size high-voltage isolation transformer Download PDFInfo
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- CN203691250U CN203691250U CN201420083193.7U CN201420083193U CN203691250U CN 203691250 U CN203691250 U CN 203691250U CN 201420083193 U CN201420083193 U CN 201420083193U CN 203691250 U CN203691250 U CN 203691250U
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- 238000002955 isolation Methods 0.000 title claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims abstract description 3
- 230000009466 transformation Effects 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 20
- 238000005516 engineering process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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Abstract
The utility model provides a small-size high-voltage isolation transformer composed of a working frequency input stage, an inverter, a cascade transformer, a DC converting stage and a working frequency output stage connected together successively. The working frequency input stage converts AC working frequency voltage to DC voltage. The inverter converts the DC voltage to high-frequency AC voltage whose frequency is higher than working frequency. The cascade transformer performs voltage isolation transmission and transformation of the high-frequency AC voltage. The DC converting stage converts AC voltage to DC voltage. The working frequency output stage converts the DC voltage to working frequency AC voltage and outputs the working frequency AC voltage. By adopting the small-size high-voltage isolation transformer that is low in cost, small in size and high in isolation voltage, a problem of isolation power supply in a high-voltage environment can be solved. The small-size high-voltage isolation transformer is especially suitable for isolation in a 20kV-800kV high-voltage environment. And due to the economical performance and compactness, the small-size high-voltage isolation transformer can substitute a traditional small-size high-voltage isolation transformer in a part of occasions.
Description
Technical field
The utility model belongs to field of power electronics, relates to a kind of minitype high voltage isolating transformer.
Background technology
Current minitype high voltage isolating transformer mostly adopts traditional Industrial Frequency Transformer isolation technology, as realized high-tension isolation, adopts traditional technology, and volume is very huge, and efficiency is low, cost is high.If will isolate power supply to being suspended under the voltage environment of up to a hundred kilovolts, adopt conventional art need to use a large amount of insulating material and insulated wire, bulky, cost is higher.The required place of equipment usually replaces with UPS insulating power supply now, but the battery cost of UPS is higher, and can not work long hours, and must have power-off charging process.
Utility model content
For overcoming the technological deficiency that existing minitype high voltage isolating transformer is bulky, efficiency is low, cost is high, the utility model discloses a kind of minitype high voltage isolating transformer.
Minitype high voltage isolating transformer described in the utility model, formed by the power frequency input stage connecting successively, inverter, cascade transformer, direct current switching stage and power frequency output stage, AC power frequency voltage is converted into direct voltage by described power frequency input stage, direct voltage is converted into the high-frequency ac voltage higher than work frequency by described inverter, described cascade transformer carries out voltage isolation transmission and transformation to high-frequency ac voltage, alternating voltage is converted into direct voltage by described direct current switching stage, and direct voltage is converted into power frequency ac voltage output by described power frequency output stage.
Preferably, described power frequency input stage is full bridge rectifier.
Further, described power frequency input stage also comprises the interchange safety electric capacity being connected in parallel between live wire and zero line and is connected on the fuse resistor on live wire, and is connected in parallel on the first filter capacitor between full bridge rectifier output.
Preferably, described inverter is the first inverter bridge being made up of four device for power switching and pwm chip, and the control end of described device for power switching output corresponding to pwm chip connects.
Preferably, described direct current transducer is full bridge rectifier.
Further, described direct current transducer also comprises the second filter capacitor being connected between two outputs of full bridge rectifier.
Preferably, described power frequency output stage is the second inverter bridge being made up of four device for power switching and SPWM control chip, and the control end of device for power switching output corresponding to SPWM control chip connects; Described the second inverter bridge also comprises the filter inductance that is connected to the output capacitance between output live wire end and output zero line side and is connected on output live wire end.
Adopt minitype high voltage isolating transformer described in the utility model, cost is low, volume is little, isolation voltage is high, can solve the isolation powerup issue under high voltage environment, especially be applicable to the isolation under 20kV-800kV high voltage environment, and can its economical and compactedness advantage, at the alternative traditional low-voltage miniature high voltage isolating transformer of part occasion.
Accompanying drawing explanation
Fig. 1 is a kind of embodiment structural representation of a kind of minitype high voltage isolating transformer described in the utility model;
In figure, Reference numeral name is called: L-input live wire N-input zero line L-1-output live wire N-1-output zero line FUSE-fuse resistor LB-interchange is inhaled peak capacitor C L-output capacitance LC-filter inductance M1-M8 and is device for power switching; T1, T2, T3 are transformer; C1, C3 are polar capacitor; C2, C4 are nonpolar electric capacity.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
Embodiment 1
As Fig. 1 illustrates an embodiment of the present utility model, the power frequency civil power of 50 hertz of 220V is inputted from input, be converted into the direct voltage of half-sine wave through a full bridge rectifier, on input live wire, be connected with fuse resistor, between input live wire and zero line, be connected with and exchange safety electric capacity, for the noise signal of filtering power frequency civil power.With respect to Half bridge rectifier, full-bridge rectification mode efficiency is higher, for improving ac input end fail safe, can between the live wire of interchange input stage and zero line, be connected with safety electric capacity LB, can absorb the high frequency spike on power frequency civil power.
The output of full bridge rectifier connects the first inverter bridge being become by four set of power switches, by well known to a person skilled in the art that switching sequence regulates, for example half-sine wave direct voltage is converted into high-frequency ac voltage by Phase Shift Control Study, can utilize existing integrated circuit (IC) chip, for example MPS1010B, BIT3105, OZ960, TL494 etc., control four device for power switching with certain sequence switch, the switching frequency of device for power switching has determined the switching frequency after conversion, described device for power switching can be power MOS pipe, pliotron or IGBT etc.
Obtain after high-frequency alternating current, utilize subsequent cascaded transformer to regulate alternating voltage amplitude, excitation rear class transformer; Cascade transformer unit carries out voltage isolation, can regulate quantity according to user isolation voltage height, and for example, in Fig. 1, every 100kV uses one-level cascade transformer, and 300kV uses three grades of transformer T1, T2, T3.
Obtain high-frequency alternating current through cascade transformer, again utilize full bridge rectifier that alternating current is converted into half-sinusoid direct current.In the present embodiment, two full bridge rectifier outputs can be connected with respectively the first filter capacitor and the second filter capacitor, the first filter capacitor and the second filter capacitor are all made up of polar capacitor and nonpolar electric capacity, in Fig. 1, the first filter capacitor is made up of polar capacitor C1 and nonpolar capacitor C 2, the second filter capacitor is made up of polar capacitor C3 and nonpolar capacitor C 4, mainly the waveform of exchange conversion unit output is processed, obtain galvanic current waveform more, reduce the interference of alternation pulse ripple to electronic circuit, guarantee the steady operation of electronic device, wherein polar capacitor adopts the some solution electric capacity of polarity, not only volume is little but also capacitance is large, nonpolar electric capacity adopts nonpolar thin-film capacitor, there is charging and discharging capabilities strong, adapt to the advantage of high-frequency work, adopt polar capacitor and nonpolar electric capacity to be used in conjunction with, can obtain large capacitance, possesses strong charging and discharging capabilities simultaneously.
Finally, again utilize four set of power switches to become the second inverter bridge, the second inverter bridge being formed by four device for power switching and SPWM control chip, the control end of device for power switching output corresponding to SPWM control chip connects, SPWM(Sinusoidal PWM, Using Sinusoidal Pulse Width Modulation) be to be the break-make of in SPWM waveform control of inverter circuit switching device by sinusoidal rule variation with the PWM waveform of sinusoidal wave equivalence by pulse duration, make the ac voltage signal of its sine wave output shape; SPWM control chip can adopt SA838, EG8010, SLE4520, MA8188, XC196Mx etc.; Described the second inverter bridge also comprises the filter inductance that is connected to the output capacitance between output live wire end and output zero line side and is connected on output live wire end, form LC filter circuit, by the filtering of high frequency clutter, the period frequency of second each switch of inverter bridge is set to 50 hertz of power frequencies, and direct current is converted into industrial-frequency alternating current.
Previously described is each preferred embodiment of the present utility model, preferred implementation in each preferred embodiment is if not obviously contradictory or take a certain preferred implementation as prerequisite, each preferred implementation arbitrarily stack combinations is used, design parameter in described embodiment and embodiment is only the utility model proof procedure for clear statement utility model people, not in order to limit scope of patent protection of the present utility model, scope of patent protection of the present utility model is still as the criterion with its claims, the equivalent structure that every utilization specification of the present utility model and accompanying drawing content are done changes, in like manner all should be included in protection range of the present utility model.
Claims (7)
1. minitype high voltage isolating transformer, formed by the power frequency input stage connecting successively, inverter, cascade transformer, direct current switching stage and power frequency output stage, AC power frequency voltage is converted into direct voltage by described power frequency input stage, direct voltage is converted into the high-frequency ac voltage higher than work frequency by described inverter, described cascade transformer carries out voltage isolation transmission and transformation to high-frequency ac voltage, alternating voltage is converted into direct voltage by described direct current switching stage, and direct voltage is converted into power frequency ac voltage output by described power frequency output stage.
2. minitype high voltage isolating transformer as claimed in claim 1, is characterized in that, described power frequency input stage is full bridge rectifier.
3. minitype high voltage isolating transformer as claimed in claim 2, it is characterized in that, described power frequency input stage also comprises the interchange safety electric capacity being connected in parallel between live wire and zero line and is connected on the fuse resistor on live wire, and is connected in parallel on the first filter capacitor between full bridge rectifier output.
4. minitype high voltage isolating transformer as claimed in claim 1, it is characterized in that, described inverter is the first inverter bridge being made up of four device for power switching and pwm chip, and the control end of described device for power switching output corresponding to pwm chip connects.
5. minitype high voltage isolating transformer as claimed in claim 1, is characterized in that, described direct current transducer is full bridge rectifier.
6. minitype high voltage isolating transformer as claimed in claim 5, is characterized in that, described direct current transducer also comprises the second filter capacitor being connected between two outputs of full bridge rectifier.
7. minitype high voltage isolating transformer as claimed in claim 1, it is characterized in that, described power frequency output stage is the second inverter bridge being made up of four device for power switching and SPWM control chip, and the control end of device for power switching output corresponding to SPWM control chip connects; Described the second inverter bridge also comprises the filter inductance that is connected to the output capacitance between output live wire end and output zero line side and is connected on output live wire end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420083193.7U CN203691250U (en) | 2014-02-26 | 2014-02-26 | Small-size high-voltage isolation transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420083193.7U CN203691250U (en) | 2014-02-26 | 2014-02-26 | Small-size high-voltage isolation transformer |
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| Publication Number | Publication Date |
|---|---|
| CN203691250U true CN203691250U (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420083193.7U Expired - Lifetime CN203691250U (en) | 2014-02-26 | 2014-02-26 | Small-size high-voltage isolation transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337506A (en) * | 2014-08-07 | 2016-02-17 | 南京南瑞继保电气有限公司 | Energy supply device from low voltage to high voltage |
-
2014
- 2014-02-26 CN CN201420083193.7U patent/CN203691250U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337506A (en) * | 2014-08-07 | 2016-02-17 | 南京南瑞继保电气有限公司 | Energy supply device from low voltage to high voltage |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140702 |