CN200990568Y - Serial inverter in three power supply inducting smelting system - Google Patents
Serial inverter in three power supply inducting smelting system Download PDFInfo
- Publication number
- CN200990568Y CN200990568Y CN 200620152201 CN200620152201U CN200990568Y CN 200990568 Y CN200990568 Y CN 200990568Y CN 200620152201 CN200620152201 CN 200620152201 CN 200620152201 U CN200620152201 U CN 200620152201U CN 200990568 Y CN200990568 Y CN 200990568Y
- Authority
- CN
- China
- Prior art keywords
- power supply
- inverter
- induction smelting
- smelting system
- model
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- General Induction Heating (AREA)
Abstract
The utility model relates to a serial connecting inverter used in a frequency conversing three power supply induction smelting system, which is characterized in that the input ends of three triphase serial connecting inverters which are connected in parallel are connected with the output end of an iron core free limiting inductance coil. The utility model has the advantages of that the serial connecting inverter can be used in the three power supply induction smelting system so as to achieve supplying power of three induction smelting furnaces with one inverter, improve power factor of the electric network, promote working efficiency, and eliminate interference of main harmonic. The harm of the three power supply induction smelting system to the electric network is reduced to the least level. Moreover, the utility model with low investment and small occupying area can save material and lower energy consumption, etc.
Description
Technical field
The utility model relates to the series rectifier circuit series inverter in a kind of frequency conversion three power supply induction smelting systems, described frequency conversion three power supply induction smelting systems are to adopt the series resonant inverter circuit to constitute, power to three induction melting furnaces with a cover current transformer, one is carried out melting operation, two are carried out heat retaining operation in addition, or the 3rd smelting furnace insulation, or the 3rd standby, and can conversion process, the stove that promptly shows heat retaining operation, next operation is melting, and then another stove transfers heat retaining operation to by melting operation.Belong to the converter plant technical field.
Background technology
Prior art adopts two cover parallel connection type frequency changing power devices respectively to two stove power supplies, and wherein a cover is to power to the electric furnace of heat retaining operation, and its power only is about 20%, can make and cause net side power factor low, inject a large amount of harmonic currents to electrical network, pollute, influence power supply quality.When capacity surpasses 600KW, do not allow to use.What wherein rectification circuit adopted is a bridge-type all controlled rectifier circuit of being made up of six arm thyristors, and its output connects two two independently series inverters, and power factor is low, shortcomings such as inefficiency.
Summary of the invention
The purpose of this utility model is the defective at above-mentioned existence, proposes the series inverter in a kind of three power supply induction smelting systems, the output of two no iron core current-limiting inductance coils of serial connection on its input.Has the power factor advantages of higher.
Technical solution of the present utility model: its structure is the output that the input of the series inverter of three parallel three phase connects two no iron core current-limiting inductance coils.
Advantage of the present utility model: this series inverter is used for three power supply induction smelting systems, realize powering to three induction melting furnaces with a cover current transformer, and can make electrical network obtain very high power factor, increase work efficiency widely, and the main Harmonic Interference of elimination, three power supply induction smelting systems reduce to minimum to the public hazards degree of electrical network, small investment, and floor space is few.Have the characteristics such as material, energy consumption are low of saving.
Description of drawings
Accompanying drawing 1 is the embodiments of the invention structural representations.
Among the figure the 1,2, the 3rd, series inverter, ATh
1～ATh
6And BTh
7～BTh
12Be thyristor (model KP; C Th
1～Cth
12And DTh
1～Dth
12And ETh
1～Eth
12Be thyristor (model KK); C01, C02, C03, C04, C05, C06 are capacitors, and L1, L2, L3 are the smelting furnace induction coils, and Ld1, Ld2 are the current-limiting inductance coils, and Cd is a DC filter capacitors.
Embodiment
The contrast accompanying drawing, its structure is by thyristor ATh
1～ATh
6And BTh
7～BTh
12The 12 pulse wave rectifier circuit that two three-phase commutation bridges forming are in series, the current-limiting inductance coil of two no iron cores of connection on its output; On the output of this inductance coil and connect the series inverter of three independent operatings.
Described series inverter 1,2,3 its structures are provided with identical, series inverter 1 or series inverter 2 after by serial connection capacitor C01, C02 or capacitor C03, C04 or capacitor C05, C06 be connected in series after thyristor CTh
1～Cth
12Or thyristor DTh
1～Dth
12Or thyristor ETh
1～Eth
12And the fast recovery diode D after the serial connection
3-D
18, or fast recovery diode D
19-D
25Or fast recovery diode D
26-D
34And connect, meet smelting furnace induction coil L1, L2, L3 at their serial connection point.
The concise and to the point course of work:
By the three-phase alternating current electric energy of A1, B 1, C1 and A2, B2, the introducing of C2 three ends, through thyristor ATh
1～ATh
6And BTh
7～BTh
12The 12 pulse wave rectifier circuit of forming are transformed into direct current energy, power to three series inverters that work alone 1, series inverter 2, series inverter 3 after current-limiting inductance coil Ld1, current-limiting inductance coil Ld2 and capacitor C d filtering.Series inverter 1 or series inverter 2 or series inverter 3 are by capacitor C01, C02 or capacitor C03, C04 or capacitor C05, C06, thyristor CTh
1～Cth
12Or thyristor DTh
1～Dth
12Or thyristor ETh
1～Eth
12, fast recovery diode D
3-D
18Or fast recovery diode D
19-D
25Form, provide the frequency conversion alternate electric energy to the smelting furnace induction coil.The power output of each series inverter is determined by the phased angle θ of inverter thyristor.Promptly regulate the power output of θ angle may command inverter.When No. 1 stove carries out melting operation, can make it obtain 80% power, if No. 2 stoves carry out heat retaining operation, can give 20% power, rectifier bridge then provides 100% power, and promptly to operate in phased angle all the time be under 0 ° the state to rectifier bridge.Make electrical network obtain very high power factor.
Claims (1)
1, the series inverter in the three power supply induction smelting systems is characterized in that the input of the series inverter of three parallel three phase connects the output of no iron core current-limiting inductance coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620152201 CN200990568Y (en) | 2006-12-29 | 2006-12-29 | Serial inverter in three power supply inducting smelting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620152201 CN200990568Y (en) | 2006-12-29 | 2006-12-29 | Serial inverter in three power supply inducting smelting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200990568Y true CN200990568Y (en) | 2007-12-12 |
Family
ID=38941602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620152201 Expired - Lifetime CN200990568Y (en) | 2006-12-29 | 2006-12-29 | Serial inverter in three power supply inducting smelting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200990568Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021035A (en) * | 2015-07-30 | 2015-11-04 | 山东荣泰感应科技有限公司 | High-energy-efficiency induction heating device |
| CN105471254A (en) * | 2016-02-01 | 2016-04-06 | 英麦科（厦门）微电子科技有限公司 | DC-DC converter |
-
2006
- 2006-12-29 CN CN 200620152201 patent/CN200990568Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021035A (en) * | 2015-07-30 | 2015-11-04 | 山东荣泰感应科技有限公司 | High-energy-efficiency induction heating device |
| CN105471254A (en) * | 2016-02-01 | 2016-04-06 | 英麦科（厦门）微电子科技有限公司 | DC-DC converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Suzhou Zhenwu Electric Furnace Co., Ltd. Assignor: Zhu Xingfa|Han Zhicheng Contract fulfillment period: 2008.8.18 to 2013.8.18 Contract record no.: 2008320001054 Denomination of utility model: Serial inverter in three power supply inducting smelting system Granted publication date: 20071212 License type: Exclusive license Record date: 20081024 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.8.18 TO 2013.8.18; CHANGE OF CONTRACT Name of requester: SUZHOU ZHENWU ELECTRIC STOVE CO., LTD. Effective date: 20081024 |
|
| CX01 | Expiry of patent term |
Granted publication date: 20071212 |
|
| EXPY | Termination of patent right or utility model |