CN1610454A - High-voltage frequency changer induction heating system - Google Patents
High-voltage frequency changer induction heating system Download PDFInfo
- Publication number
- CN1610454A CN1610454A CN 200410065521 CN200410065521A CN1610454A CN 1610454 A CN1610454 A CN 1610454A CN 200410065521 CN200410065521 CN 200410065521 CN 200410065521 A CN200410065521 A CN 200410065521A CN 1610454 A CN1610454 A CN 1610454A
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- CN
- China
- Prior art keywords
- thyristor
- thyristors
- heating system
- voltage frequency
- inverter
- 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.)
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- General Induction Heating (AREA)
Abstract
The high voltage frequency variable inducing heating system has wholly controlled bridge rectifier circuit comprising six thyristors, inverter comprising four thyristors parallelly connected to the output of the rectifier, compensating capacitor and inducing heating furnace connected parallelly to the compensating capacitor. The present invention has the advantages of high voltage, low loop loss, raised electric efficiency, inducing coil current Q times inverter output current, eddy current in workpiece raising the efficiency, less thyristors in the inverter resulting in high reliability and low loss.
Description
Technical field
What the present invention relates to is a kind of high-voltage frequency changer induction heating system that is used for the variable frequency induction heating of melting.Belong to the converter plant technical field.
Background technology
Adopted the variable frequency induction heater system of low compacting in the past, the primary voltage of general power frequency side is from 380V～900V.When the capacity of frequency converter greater than 2500KW, during as 3000KW, the electric current in the circuit is bigger, its load circuit, promptly the electric current of induction coil can reach more than the 23000A, and return loss is increased greatly, electrical efficiency reduces.
Summary of the invention
The object of the invention is to overcome the defective that prior art exists, and proposes a kind of high-voltage frequency changer induction heating system.It can effectively reduce return loss, obviously improves electrical efficiency.Technical solution of the present invention: its structure is on the output of the bridge-type all controlled rectifier circuit of being made up of six thyristors and connects a shunt chopper that is made of four thyristors, in the described shunt chopper and connect two groups the serial connection after thyristors, every group by two thyristors, between the contact of the thyristor after two groups of serial connections and meet building-out capacitor C
0With induction heater L
0Advantage of the present invention: adopt high voltage system, reduce return loss, obviously improve electrical efficiency; The current value of induction coil is Q a times of inverter output current, and Q is the quality factor of load circuit, is beneficial to produce big eddy current in the stove in the workpiece, to raise the efficiency; Reduce the number of elements in parallel of thyristor in the inverter bridge, with reliability and the minimizing loss that improves invertor operation; Promote the reliability of overcurrent protection.
Accompanying drawing is a structural representation of the present invention,
Th among the figure
1～Th
6, Th
7～Th
10Be thyristor, thyristor Th wherein
1～Th
6Model is KP, thyristor Th
7～Th
10Model is KK.
Embodiment
The contrast accompanying drawing, its structure is by six thyristor Th
1～Th
6On the output of the bridge-type all controlled rectifier circuit of forming and connect one by thyristor Th
7～Th
10The shunt chopper 1 that constitutes, in the described shunt chopper and connect two groups of thyristors after the serial connection, wherein one group is thyristor Th
7, Th
10, another group is thyristor Th
9, Th
8, between contact A, the B of thyristor after two groups of serial connections and meet building-out capacitor C
0With induction heater L
0
A, B, C three-phase main-frequency primary voltage are 1250V～2000V, when primary voltage is 2000V, when power is 3000KW, make the load circuit electric current only be 10000A, and hence one can see that, and the loss in the loop greatly reduces, and total electrical efficiency improves.This device is used for the heating of melt variable frequency induction, for example steel plate heating, continuous casting and rolling, forging, the heating of thin plate steel, occasions such as Metal Melting.Its course of work: three-phase or six phase formula power frequency system power are through thyristor Th
1～Th
6The full-controlled rectifier bridging that constitutes changes direct current energy into, through big reactor Ld
1, Ld
2Filtering is to by thyristor Th
7～Th
10The shunt chopper power supply that constitutes, the AC energy of exporting a certain frequency by inverter are again to by compensation condenser C
0And induction heater L
0Upper frequency (150～2500H is provided
2) electric energy.
Claims (1)
1, high-voltage frequency changer induction heating system is characterized in that by thyristor (Th
1～Th
6) on the output of the bridge-type all controlled rectifier circuit formed and connect one by thyristor (Th
7～Th
10) shunt chopper that constitutes, in the described shunt chopper and connect two groups of thyristors after the serial connection, wherein one group is thyristor (Th
7, Th
10), another group is thyristor (Th
9, Th
8), between the contact (A, B) of thyristor after two groups of serial connections and meet building-out capacitor (C
0) and induction heater (L
0).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410065521 CN1610454A (en) | 2004-11-22 | 2004-11-22 | High-voltage frequency changer induction heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410065521 CN1610454A (en) | 2004-11-22 | 2004-11-22 | High-voltage frequency changer induction heating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1610454A true CN1610454A (en) | 2005-04-27 |
Family
ID=34764716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410065521 Pending CN1610454A (en) | 2004-11-22 | 2004-11-22 | High-voltage frequency changer induction heating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1610454A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101207948B (en) * | 2007-11-16 | 2010-06-02 | 山东瑞斯高创股份有限公司 | Electronic heating apparatus |
-
2004
- 2004-11-22 CN CN 200410065521 patent/CN1610454A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101207948B (en) * | 2007-11-16 | 2010-06-02 | 山东瑞斯高创股份有限公司 | Electronic heating apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |