CN102611309A - High-insulation-voltage isolated power supply - Google Patents
High-insulation-voltage isolated power supply Download PDFInfo
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- CN102611309A CN102611309A CN2012100423223A CN201210042322A CN102611309A CN 102611309 A CN102611309 A CN 102611309A CN 2012100423223 A CN2012100423223 A CN 2012100423223A CN 201210042322 A CN201210042322 A CN 201210042322A CN 102611309 A CN102611309 A CN 102611309A
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Abstract
The invention particularly relates to a high-insulation-voltage isolated power supply used in a power module of a cascaded multilevel topological static synchronous compensator. The high-insulation-voltage isolated power supply is characterized in comprising a low-voltage DC (direct current) power supply, a DC/AC (alternating current) converter, an isolated transformer and a rectifier filter, wherein the input end of the DC/AC converter is connected with the low-voltage DC power supply, and the output end is connected with the input end of the isolated transformer; and the output end of the isolated transformer is connected with the input end of the rectifier filter. The high-insulation-voltage isolated power supply is small in size and light in weight, and has the advantages of high stability and high safety.
Description
Technical field
The present invention is specifically related to a kind of high dielectric voltage withstand insulating power supply that is applied to cascade connection multi-level topology STATCOM power model.
Background technology
STATCOM is parallel in the electrical network; Be equivalent to a controlled reactive current source; Its reactive current can be followed the reactive load change in current apace and changed; Automatically the required reactive power of compensation network system realizes dynamic passive compensation to power system reactive power, belongs to the important component part of flexible flexible AC transmitting system (FACTS).
The direct hanging type STATCOM adopts H bridge cascade connection multi-level topology at present, and for the ease of producing, H bridge and dc-link capacitance are packaged into power model.Power model also must comprise some circuit, such as being used for fiber optical transceiver, and the DC bus-bar voltage sample circuit, the power device temperature sampling circuit, power device drive circuit etc., these circuit make power model normally to move.And these circuit all need working power, and producing this power supply at present has 2 kinds of methods usually:
First kind, directly from the dc bus power taking, through the working power of DC/DC conversion acquisition needs, but this method of supplying power to has a fatal shortcoming.For thereby the utilance maximization that makes power device reduces cost, DC bus-bar voltage all is set to than higher usually, generally chooses 800V to 1000V, adds the ripple of DC bus-bar voltage, and busbar voltage reaches as high as more than the 1200V.On the other hand, in order to reduce the volume of DC/DC converter, switching frequency is all obtained than higher usually, so need to select the switching device of 1200V.Such DC/DC converter is difficult to design, even design, reliability also can be very poor.
Second kind,,, obtain the working power of a stable power as power model through level DC/DC conversion later through transformer isolation, step-down, rectification from the output power taking of H bridge.This power supply plan also has its shortcoming, and the output of H bridge is the square-wave voltage that receives Sine Modulated, contains abundant high order harmonic; And the modulation wave frequency is the line voltage frequency, is generally 50Hz, because frequency of modulated wave is low; Usually use silicon steel sheet as magnetic core of transformer; But the high-frequency loss of silicon steel sheet is big, thereby the transformer temperature rise is higher, burns easily to cause equipment fault.In addition, H bridge output voltage is higher, so the volume and weight of transformer is also bigger.
Summary of the invention
The objective of the invention is to propose a kind of high dielectric voltage withstand insulating power supply that is applied to cascade connection multi-level topology STATCOM power model.It is from low-voltage dc power supply (being generally 24V) power taking, the problem that does not exist switching device to be difficult to select; The isolating transformer magnetic core uses the little magnetic material of high-frequency loss, generate heat little, reliability is high, power supplying efficiency is high.
The present invention realizes through following technical scheme:
It is a kind of high dielectric voltage withstand insulating power supply; It is characterized in that comprising low-voltage dc power supply, DC/AC converter, isolating transformer and rectifier filter; The input of said DC/AC converter links to each other with low-voltage dc power supply; The input of output and isolating transformer links to each other, and the output of isolating transformer is connected to the rectifier filter input.
As a preferred version of the present invention: the input winding of isolating transformer and/or output winding use the high dielectric voltage withstand cable.
As a preferred version of the present invention: isolating transformer is provided with the transformer screen of ground connection.
As a preferred version of the present invention: low-voltage dc power supply is provided with Transient Suppression Diode over the ground.
Rectifier filter output of the present invention promptly can be used as required working power.So, input DC power changes through straight-alternation, becomes high-frequency ac power, then through the high dielectric voltage withstand transformer isolation, becomes required working power through behind the rectifying and wave-filtering again.
Be regulated output voltage, can also connect back level DC/DC circuit thereafter, but be not that the present invention institute is necessary.In addition; In order to tighten security; Isolating transformer can add the transformer screen, and with the transformer shielding layer grounding, the input low-voltage dc power supply also can be provided with Transient Suppression Diode over the ground; These two measures can effectively prevent to cause after High-Voltage Insulation is destroyed the risk of personal safety, but this neither the present invention institute necessary.
The present invention has that volume is little, in light weight, good stability, advantage that fail safe is good.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention.
Shown in figure: 1 low-voltage dc power supply; 2 DC/AC converters; 3 isolating transformers; 4 rectifier filters; The 2-1 switching tube; 2-2 electric capacity; 3-1 imports winding; 3-2 exports winding; The 4-1 rectifier diode; The 4-2 filter capacitor; 5 the earth; 6 Transient Suppression Diodes; 7 transformer screens.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further elaboration.
As shown in Figure 1: the input of DC/AC converter 2 links to each other with low-voltage dc power supply 1, and output links to each other with the input of isolating transformer 3, and the output of isolating transformer 3 is connected to rectifier filter 4 inputs.DC/AC converter 2 converts the direct voltage of input into high-frequency ac voltage; Isolating transformer 3 has been born the common-mode voltage between power model and the ground; The input of isolating transformer 3 is from the high-frequency ac voltage of DC/AC converter 2 outputs; High-frequency ac voltage through after isolating transformer 3 isolation gets into rectifier filter 4, and the output of rectifier filter 4 is the working power that power model needs.
As shown in Figure 2: switching tube 2-1 and electric capacity 2-2 constitute a DC/AC converter (half-bridge inverter), and DRVP and DRVN are respectively the DC/AC converter drive signals of two switching tube 2-1 up and down, two drive signal complementations, and have certain dead band; The input winding 3-1 of isolating transformer 3 uses common insulated cable, and output winding 3-2 uses the High-Voltage Insulation cable; 4 rectifier diode 4-1 constitute full-bridge rectifier, and full-bridge rectifier and filter capacitor 4-2 form rectifier filter 4, through obtaining the working power of power model behind the filter capacitor 4-2; Low-voltage dc power supply 1 is provided with Transient Suppression Diode 6 over the ground, and transformer screen 7 is received the earth 5, and they can effectively prevent the safety problem that High-Voltage Insulation inefficacy back produces.
Claims (4)
1. high dielectric voltage withstand insulating power supply; It is characterized in that comprising low-voltage dc power supply, DC/AC converter, isolating transformer and rectifier filter; The input of said DC/AC converter links to each other with low-voltage dc power supply; The input of output and isolating transformer links to each other, and the output of isolating transformer is connected to the rectifier filter input.
2. high dielectric voltage withstand insulating power supply according to claim 1 is characterized in that the input winding of isolating transformer and/or output winding use the high dielectric voltage withstand cable.
3. high dielectric voltage withstand insulating power supply according to claim 2 is characterized in that isolating transformer is provided with the transformer screen of ground connection.
4. high dielectric voltage withstand insulating power supply according to claim 1 is characterized in that low-voltage dc power supply is provided with Transient Suppression Diode over the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100423223A CN102611309A (en) | 2012-02-24 | 2012-02-24 | High-insulation-voltage isolated power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100423223A CN102611309A (en) | 2012-02-24 | 2012-02-24 | High-insulation-voltage isolated power supply |
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| Publication Number | Publication Date |
|---|---|
| CN102611309A true CN102611309A (en) | 2012-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100423223A Pending CN102611309A (en) | 2012-02-24 | 2012-02-24 | High-insulation-voltage isolated power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242675A (en) * | 2014-09-12 | 2014-12-24 | 广州供电局有限公司 | Isolating circuit of low-voltage power supply |
| CN106505862A (en) * | 2016-10-18 | 2017-03-15 | 上海希形科技有限公司 | The insulating power supply of few element |
| CN107111348A (en) * | 2015-07-03 | 2017-08-29 | 富士电机株式会社 | Supply unit and the server system for possessing the supply unit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007318999A (en) * | 2007-08-31 | 2007-12-06 | Shindengen Electric Mfg Co Ltd | Switching power supply |
| CN201689765U (en) * | 2009-11-04 | 2010-12-29 | 北京动力源科技股份有限公司 | Transformer |
| CN202444420U (en) * | 2012-02-24 | 2012-09-19 | 山东德佑电气有限公司 | High insulation voltage resisting isolating power supply |
-
2012
- 2012-02-24 CN CN2012100423223A patent/CN102611309A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007318999A (en) * | 2007-08-31 | 2007-12-06 | Shindengen Electric Mfg Co Ltd | Switching power supply |
| CN201689765U (en) * | 2009-11-04 | 2010-12-29 | 北京动力源科技股份有限公司 | Transformer |
| CN202444420U (en) * | 2012-02-24 | 2012-09-19 | 山东德佑电气有限公司 | High insulation voltage resisting isolating power supply |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242675A (en) * | 2014-09-12 | 2014-12-24 | 广州供电局有限公司 | Isolating circuit of low-voltage power supply |
| CN104242675B (en) * | 2014-09-12 | 2016-10-19 | 广州供电局有限公司 | The isolation circuit of low-voltage power supply |
| CN107111348A (en) * | 2015-07-03 | 2017-08-29 | 富士电机株式会社 | Supply unit and the server system for possessing the supply unit |
| CN106505862A (en) * | 2016-10-18 | 2017-03-15 | 上海希形科技有限公司 | The insulating power supply of few element |
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| C06 | Publication | ||
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CI01 | Publication of corrected invention patent application |
Correction item: Applicant name Correct: Shandong Deyou Electric Co., Ltd. False: Shandong Chilintec Electric Equipment Manufacture Co., Ltd. Shandong Deyou Electric Co., Ltd. Number: 30 Volume: 28 Correction item: Applicant name Correct: Shandong Deyou Electric Co., Ltd. False: Shandong Chilintec Electric Equipment Manufacture Co., Ltd.|Shandong Deyou Electric Co., Ltd. Number: 30 Number plate file serial number: 101602004139 Volume: 28 |
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| ERR | Gazette correction | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120725 |