CN203398986U - Grounding circuit of parallel resonance medium-frequency power supply - Google Patents
Grounding circuit of parallel resonance medium-frequency power supply Download PDFInfo
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- CN203398986U CN203398986U CN201320493018.0U CN201320493018U CN203398986U CN 203398986 U CN203398986 U CN 203398986U CN 201320493018 U CN201320493018 U CN 201320493018U CN 203398986 U CN203398986 U CN 203398986U
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- thyristor
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- power supply
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Abstract
The utility model provides a grounding circuit of a parallel resonance medium-frequency power supply, which is characterized by comprising a rectifier transformer without grounding, a rectifier circuit, a direct current reactance circuit, an inverter circuit and a resonant capacitor circuit, wherein the rectifier transformer without grounding is connected with the rectifier circuit through a circuit breaker and a fuse; the rectifier circuit converts alternating current into direct current; the direct current reactance circuit converts low-voltage direct current into high-voltage alternating current; the resonant capacitor circuit is connected with the inverter circuit; the resonant capacitor circuit is that a first capacitor C1 is connected with a first coil L1 in parallel, a second capacitor C2 is connected with a third capacitor C3 in series and then connected with the capacitor C1 in parallel, a connecting end of the second capacitor C2 and the third capacitor C3 is connected with a grounding end GND, and a second capacitance value and a third capacitance value are identical. The grounding circuit provided by the utility model has the advantage of being grounded through the capacitors, thereby causing no overvoltage for thyristors which are relatively sensitive to voltage, and being capable of absorbing crest voltage generated by short circuit.
Description
Technical field
The utility model relates to a kind of parallel resonance intermediate frequency power supply earthed circuit, particularly a kind of parallel resonance intermediate frequency power supply earthed circuit being applied in apparatus for melting metal.
Background technology
Intermediate frequency power supply is casting, very important equipment in special steel smelting and heat treatment industry, particularly at special steel smelting industry, powerful parallel resonance intermediate frequency power supply has huge advantage, and the grounding system of power-supply system is an important assurance of the normal operation of assurance system and personal security.
As shown in Figure 1, there is in actual use certain problem in tradition rectifier transformer earthed circuit.Because this system is a solidly grounded system, so after electric furnace operates in several years, the insulating barrier effect of the induction coil of electric furnace can reduce, so when coil occurs discharging over the ground, will cause the thyristor of rectifying part because overvoltage causes damaging.Mainly because this grounding system is a harder ground connection.When the ground connection of any position of coil, can cause occurring that very high voltage causes rectification thyristor to damage on rectification thyristor, cause the poor stability of whole intermediate frequency power supply work, return user simultaneously and brought the inconvenience of producing, increase maintenance cost simultaneously.
Utility model content
A kind of parallel resonance intermediate frequency power supply earthed circuit providing of the present utility model, to overcome the defect of above-mentioned prior art.
The utility model provides a kind of parallel resonance intermediate frequency power supply earthed circuit, has such feature: without the rectifier transformer Fen San road of ground connection, often lead up to circuit breaker, fuse to be connected with rectification circuit; Rectification circuit is converted to direct current by the alternating current that receives rectifier transformer; The direct current reactive circuit that is connected with rectification circuit and the alternating current component in direct current is limited; Be connected and the direct current of low pressure be converted to the inverter circuit of High Level AC Voltage with direct current reactive circuit; The resonant capacitance circuit being connected with inverter circuit; Wherein, resonant capacitance circuit is that the first capacitor C 1 is in parallel with the first coil L1, in parallel with the first capacitor C 1 after the second capacitor C 2 and the 3rd capacitor C 3 series connection, the second capacitor C 2 is connected with earth terminal GND with the 3rd capacitor C 3 links, and the second capacitance is identical with the 3rd capacitance.
Further, the utility model provides a kind of parallel resonance intermediate frequency power supply earthed circuit, can also have such feature: rectification circuit comprises: the negative pole of the first thyristor D1 is connected with the 3rd thyristor D3 negative pole, the 5th thyristor D5 negative pole respectively, positive pole is connected with the second thyristor D2 is anodal; The positive pole of the 4th thyristor D4 respectively, six thyristor D6 positive pole anodal with the second thyristor D2 is connected, and negative pole is connected with the 3rd thyristor D3 is anodal; The positive pole of the 5th thyristor D5 is connected with the negative pole of the 6th thyristor D6.
Further, the utility model provides a kind of parallel resonance intermediate frequency power supply earthed circuit, can also have such feature: wherein, inverter circuit comprises: the negative pole of the 7th thyristor D7 is connected with the 8th thyristor D8 is anodal, positive pole is connected with the 9th thyristor D9 is anodal; The positive pole of the tenth thyristor D10 and the 9th thyristor D9 negative pole, negative pole is connected with the 8th thyristor D8 negative pole.
Further, the utility model provides a kind of parallel resonance intermediate frequency power supply earthed circuit, can also have such feature: the first thyristor D1, the second thyristor D2, the 3rd thyristor D3, the 4th thyristor D4, the 5th thyristor D5, the 6th thyristor D6 are the common rectification thyristor of KP type.
Further, the utility model provides a kind of parallel resonance intermediate frequency power supply earthed circuit, can also have such feature: the 7th thyristor D7, the 8th thyristor D8, the 9th thyristor D9, the tenth thyristor D10 are KK type high speed thyristor.
The beneficial effect of utility model
The parallel resonance intermediate frequency power supply earthed circuit providing according to the utility model, because the neutral point of rectifier transformer is not connected with ground connection, in resonant capacitance circuit, after two capacitances in series, be parallel to the first electric capacity, form the neutral point of a capacitor loop, this neutral ground; So; grounding system is to pass through capacity earth; once the first coil; because during fault earthing, high pressure peak voltage appears at ground capacity two ends, can be to relatively the thyristor of voltage-sensitive not being caused to any overvoltage; the characteristic of utilizing in addition electric capacity both end voltage not suddenly change; can also accomplish to absorb the crest voltage producing due to short circuit, reduce system damage, thereby reach protection rectification thyristor, when system has earth fault, obtain priority protection.
Accompanying drawing explanation
Fig. 1 is traditional rectifier transformer earthed circuit figure.
Fig. 2 is parallel resonance intermediate frequency power supply earthed circuit figure.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further described.
Fig. 2 is parallel resonance intermediate frequency power supply earthed circuit figure.
As shown in Figure 2, parallel resonance intermediate frequency power supply earthed circuit comprises: the rectifier transformer being connected with three phase mains, three circuit breakers, three fuses, rectification circuit, direct current reactive circuit, inverter circuit and resonance condenser networks.
The neutral point of rectifier transformer is not connected with ground connection.Rectifier transformer Fen San road, the first via is connected with rectification circuit with fuse FU1 by circuit breaker Q F1 respectively; The second tunnel is connected with rectification circuit with fuse FU2 by circuit breaker Q F2 respectively; Third Road is connected with rectification circuit with fuse FU3 by circuit breaker Q F3 respectively.
Rectification circuit comprises: the first thyristor D1, the second thyristor D2, the 3rd thyristor D3, the 4th thyristor D4, the 5th thyristor D5 and the 6th thyristor D6.The negative pole of the first thyristor D1 is connected with the 3rd thyristor D3 negative pole, the 5th thyristor D5 negative pole respectively; Positive pole is connected with the second thyristor D2 is anodal.The positive pole of the 4th thyristor D4 respectively, six thyristor D6 positive pole anodal with the second thyristor D2 is connected, and negative pole is connected with the 3rd thyristor D3 is anodal.The positive pole of the 5th thyristor D5 is connected with the negative pole of the 6th thyristor D6.
Direct current reactive circuit consists of the second coil L2 and tertiary coil L3.Second coil L2 one end is connected with the first thyristor D1 negative pole, and the other end is connected with the positive pole of the 7th thyristor D7.Tertiary coil L3 one end is connected with the positive pole of the second thyristor D2, and the other end is connected with the negative pole of the 8th thyristor D8.
Inverter circuit comprises: the 7th thyristor D7, the 8th thyristor D8, the 9th thyristor D9 and the tenth thyristor D10.The negative pole of the 7th thyristor D7 is connected with the 8th thyristor D8 is anodal, and positive pole is connected with the 9th thyristor D9 is anodal.The positive pole of the tenth thyristor D10 and the 9th thyristor D9 negative pole, negative pole is connected with the 8th thyristor D8 negative pole.
Resonant capacitance circuit comprises: the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3 and the first coil L1.The first capacitor C 1 is in parallel with the first coil L1.The second capacitor C 2 and the 3rd capacitor C 3 series connection, in parallel with the first capacitor C 1 after series connection.The second capacitor C 2 is connected with earth terminal GND with the 3rd capacitor C 3 links.The second capacitance is identical with the 3rd capacitance.One end of the first capacitor C 1 is connected with the negative pole of the 7th thyristor D7, and the other end is connected with the negative pole of the 9th thyristor D9.
The first thyristor D1, the second thyristor D2, the 3rd thyristor D3, the 4th thyristor D4, the 5th thyristor D5, the 6th thyristor D6 are the common rectification thyristor of KP type.
The 7th thyristor D7, the 8th thyristor D8, the 9th thyristor D9, the tenth thyristor D10 are KK type high speed thyristor.
The operation principle of parallel resonance intermediate frequency power supply earthed circuit:
The neutral point of rectifier transformer is not connected with ground connection, the electric capacity of first capacitor C 1 two series connection in parallel, i.e. the second capacitor C 2 and the 3rd capacitor C 3 in resonant capacitance circuit.After two capacitances in series, be parallel to the position of the first capacitor C 1, form the neutral point of a capacitor loop, this neutral ground just can be formed to the grounding system of intermediate frequency power supply system, can reach the earthing effect of the neutral ground of rectifier transformer.Because earth point is in resonant capacitance circuit, grounding system is to pass through capacity earth, once the first coil L1, be that the induction coil of electric furnace is because during fault earthing, high pressure peak voltage appears at ground capacity two ends, can be to relatively the thyristor of voltage-sensitive being caused to any overvoltage, and the characteristic of utilizing in addition electric capacity both end voltage not suddenly change, can also accomplish to absorb the crest voltage producing due to short circuit, reduce system damage.Thereby reach protection rectification thyristor and when system has earth fault, obtain priority protection.
Claims (5)
1. a parallel resonance intermediate frequency power supply earthed circuit, is characterized in that having:
Without the rectifier transformer Fen San road of ground connection, the circuit breaker (QF1, QF2, QF3) of often leading up to is connected with rectification circuit with fuse (FU1, FU2, FU3);
Described rectification circuit is converted to direct current by the alternating current that receives described rectifier transformer;
The direct current reactive circuit that is connected with described rectification circuit and the alternating current component in described direct current is limited;
Be connected and the direct current of described low pressure be converted to the inverter circuit of High Level AC Voltage with described direct current reactive circuit;
The resonant capacitance circuit being connected with described inverter circuit;
Wherein, described resonant capacitance circuit is that the first electric capacity (C1) is in parallel with the first coil (L1), in parallel with described the first electric capacity (C1) after the second electric capacity (C2) and the series connection of the 3rd electric capacity (C3), described the second electric capacity (C2) is connected with earth terminal (GND) with described the 3rd electric capacity (C3) link, and described the second capacitance is identical with described the 3rd capacitance.
2. parallel resonance intermediate frequency power supply earthed circuit according to claim 1, is characterized in that:
Wherein, described rectification circuit comprises:
The negative pole of the first thyristor (D1) is connected with the 3rd thyristor (D3) negative pole, the 5th thyristor (D5) negative pole respectively, and positive pole is connected with the second thyristor (D2) is anodal;
The positive pole of the 4th thyristor (D4) respectively, six thyristor (D6) positive pole anodal with described the second thyristor (D2) is connected, and negative pole is connected with described the 3rd thyristor (D3) is anodal;
The positive pole of described the 5th thyristor (D5) is connected with the negative pole of described the 6th thyristor (D6).
3. parallel resonance intermediate frequency power supply earthed circuit according to claim 1, is characterized in that:
Wherein, described inverter circuit comprises:
The negative pole of the 7th thyristor (D7) is connected with the 8th thyristor (D8) is anodal, and positive pole is connected with the 9th thyristor (D9) is anodal;
The positive pole of the tenth thyristor (D10) and described the 9th thyristor (D9) negative pole, negative pole is connected with described the 8th thyristor (D8) negative pole.
4. parallel resonance intermediate frequency power supply earthed circuit according to claim 2, is characterized in that:
Wherein, described the first thyristor (D1), described the second thyristor (D2), described the 3rd thyristor (D3), described the 4th thyristor (D4), described the 5th thyristor (D5), described the 6th thyristor (D6) are the common rectification thyristor of KP type.
5. parallel resonance intermediate frequency power supply earthed circuit according to claim 3, is characterized in that:
Wherein, described the 7th thyristor (D7), described the 8th thyristor (D8), described the 9th thyristor (D9), described the tenth thyristor (D10) are KK type high speed thyristor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320493018.0U CN203398986U (en) | 2013-08-13 | 2013-08-13 | Grounding circuit of parallel resonance medium-frequency power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320493018.0U CN203398986U (en) | 2013-08-13 | 2013-08-13 | Grounding circuit of parallel resonance medium-frequency power supply |
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| Publication Number | Publication Date |
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| CN203398986U true CN203398986U (en) | 2014-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320493018.0U Expired - Lifetime CN203398986U (en) | 2013-08-13 | 2013-08-13 | Grounding circuit of parallel resonance medium-frequency power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836453A (en) * | 2015-05-14 | 2015-08-12 | 杭州科远电炉有限公司 | Novel thyristor series half-bridge inverter resonant frequency inverter device |
| CN110212782A (en) * | 2019-05-17 | 2019-09-06 | 山东电亮亮信息科技有限公司 | A kind of vacuum induction furnace intermediate frequency power supply energy conserving system |
| US11165330B2 (en) | 2017-07-13 | 2021-11-02 | The University Of Birmingham | Elimination of commutation failure of LCC HVDC system |
-
2013
- 2013-08-13 CN CN201320493018.0U patent/CN203398986U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836453A (en) * | 2015-05-14 | 2015-08-12 | 杭州科远电炉有限公司 | Novel thyristor series half-bridge inverter resonant frequency inverter device |
| US11165330B2 (en) | 2017-07-13 | 2021-11-02 | The University Of Birmingham | Elimination of commutation failure of LCC HVDC system |
| CN110212782A (en) * | 2019-05-17 | 2019-09-06 | 山东电亮亮信息科技有限公司 | A kind of vacuum induction furnace intermediate frequency power supply energy conserving system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201417 Fengxian District, Shanghai Road, No. 128 Patentee after: SHANGHAI XINYAN INDUSTRIAL EQUIPMENT CO.,LTD. Address before: 201417 Fengxian District, Shanghai Road, No. 128 Patentee before: SHANGHAI XINYAN INDUSTRY EQUIPMENT Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140115 |