CN2195175Y - Switch type frequency-change induction heating apparatus - Google Patents
Switch type frequency-change induction heating apparatus Download PDFInfo
- Publication number
- CN2195175Y CN2195175Y CN 94213956 CN94213956U CN2195175Y CN 2195175 Y CN2195175 Y CN 2195175Y CN 94213956 CN94213956 CN 94213956 CN 94213956 U CN94213956 U CN 94213956U CN 2195175 Y CN2195175 Y CN 2195175Y
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- induction heating
- inverter
- utility
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- frequency
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 23
- 230000006698 induction Effects 0.000 title claims abstract description 22
- 230000033228 biological regulation Effects 0.000 claims abstract description 5
- 238000000518 rheometry Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000004044 response Effects 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
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Abstract
The utility model discloses an induction heating apparatus. The existing devices have complex tuning control return circuits, and can not modulate in extensiveness range according to arts demands. The utility model sends induction heating load current signals back to a pulse width modulator which carries out the pulse-width modulation of a dc conversion circuit, changes the direct voltage and the invert voltage amplitude value proportionally, and realizes the regulation and the constant of the loading current magnitude. The utility model implements the frequency control of gate driving signals by the full controlling switch of an inverter and realizes continuous frequency conversion. The utility model has the advantages of simple simplified control, reliable operation, small volume, low cost, big operating frequency, continuously adjustable range, fast current regulation response speed and favorable constant current performance.
Description
The utility model is a kind of induction heating equipment.
Since the seventies, the intermediate frequency induction heating device that is made of thyristor inverter has obtained popularization and application, and its major advantage is can the big power of control ratio high power transistor.But thyristor inverter must be equipped with the intermediate frequency resonant circuit of LC element formation could assist it to realize zero-crossing switching.And still can keep LC to be in resonance condition when changing with load characteristic for inductance value in the heating process process, need to introduce complicated tuning control loop and also have relatively large inverter failure probability.Because the LC component parameters has limited resonance range, thereby circuit can not be by arts demand frequency modulation on a large scale.
The purpose of this utility model provides that a kind of circuit is simple, control easily, frequency can be at the induction heating equipment of setting up continuously in a big way.
Since the eighties day by day popularization and application can shutoff type switching device IGBT(igbt), the GTO(gate level turn-off thyristor) and the GTR(high power transistor) etc., have bigger switch power and higher switching manipulation frequency, especially IGBT and have lower loss and less gate driving power (voltage driven type).In addition, in being suitable in recent years, high-magnetodensity increment, low-loss non-crystalline material of high frequency transducing have also entered the practical stage, make all that aspect induction heating can the shutoff type controlling switching device entirely with intermediate frequency replaces thyristor half control type switching device and become possibility.
Structure of the present utility model is as follows: the input of AC power and rectifier joins, the output of rectifier and the input of DC transfer circuit join, the output of DC transfer circuit and the input of inverter join, the output of inverter and induction heating load are joined, the control input end and the frequency-variable controller of inverter join, the input of pulse-width modulator electrically connects by current transformer and induction heating load-sensing, the output of pulse-width modulator and the control utmost point of the power switch pipe in the DC transfer circuit join, and inverter contains the full-control type electronic switching device.
Operation principle of the present utility model is: the induction heating load current signal is fed back to pulse-width modulator, by the latter DC transfer circuit is carried out pulse-width modulation, make the corresponding change of amplitude of direct voltage and then inverter voltage, and realize the adjusting of inductive induction heating load current value and constant.By the inverter full-controlled switch being implemented the variable frequency control of gate electrode drive signals, realize the continuous frequency conversion of the inverter output of band induction heating load.Said DC transfer circuit is that function is to carry out the circuit that voltage output value is regulated to the direct voltage of constant input, is known circuits, comprising power switch pipe, and fly-wheel diode and filter circuit.Said pulse-width modulator also is conventional universal circuit, as the SG3524 integrated circuit.Said frequency-variable controller is similarly the conventional universal circuit with regulating impulse frequency functionality, as the function of the regulating impulse frequency that can adopt the conventional universal circuit of pulse-width modulator.Said inverter also is a known circuits.
Preferably be added with isolating transformer between inverter in the utility model and induction heating load, with coupling operating voltage and raising safety in utilization.
The utility model is compared with the thyristor-type intermediate frequency induction heating device has following advantage:
1, required auxiliary zero-crossing switching of thyristor if inverter and reactive power compensation resonant tank need be set, thereby make circuit reduction, simple, the operational reliability raising of control, device volume reduces, and cost reduces.
2, since no resonant tank to the restriction of frequency conversion, thereby operating frequency is adjustable continuously on a large scale, is convenient to adapt to multi-state and moves and increase work efficiency.
3, because Current Regulation is controlled by 20KHZ medium-frequency pulse width modulator, and the Current Regulation response speed is fast, the constant current performance is good.
Fig. 1 is an electric theory diagram of the present utility model.
Fig. 2 is the electrical schematic diagram of embodiment.
Several inverter circuits of Fig. 3 for adopting among the embodiment, wherein (a) be inverter circuit used among Fig. 2, (b) with (c) be other two kinds of inverter circuits.
Embodiment: see Fig. 1-3.Fig. 1 also is the electric theory diagram of embodiment simultaneously.
PS among the figure is an AC power.REC is a rectifier.DE is a DC transfer circuit, and INV is an inverter.IHL is the induction heating load.PWM is a pulse-width modulator.MF is a frequency-variable controller.CT is a current transformer.ITR becomes device for isolating.E is the Equivalent DC power supply.T1 is the full-control type power switch pipe in the DC transfer circuit.D1 is the fly-wheel diode in the DC transfer circuit.L, C constitute filter circuit.T2-T5 is the igbt (model is MBI200L-120) in the inverter.D2-D5 is the protection diode in the inverter.L0, R0 are for constituting equivalent inductance, the resistance of induction heating load IHL.In the DC transfer circuit, power switch pipe T1 forward is series at the positive terminal of Equivalent DC power supply E, and the gate pole of switch transistor T 1 connects the PWM control loop; The gate pole of the output termination T1 of PWM control loop, the secondary side output of input termination current transformer CT, diode D1 are connected anti-parallel between positive and negative electrode with the DC circuit after the T1, and the LC filter is connected between D1 and the inverter INV.
The performance parameter of present embodiment is as follows:
Supply power voltage: 380V, 50HZ
Rating of set: 50KW
Operating current: 150A(is adjustable continuously)
Operating frequency: 1KHZ-10KHZ is adjustable continuously
Claims (2)
1, a kind of switching mode pressure regulation control rheology is induction heating equipment frequently, it is characterized in that: the input of AC power and rectifier joins, the output of rectifier and the input of DC transfer circuit join, the output of DC transfer circuit and the input of inverter join, the output of inverter and induction heating load are joined, the control input end and the frequency-variable controller of inverter join, the input of pulse-width modulator electrically connects by current transformer and induction heating load-sensing, the output of pulse-width modulator and the control utmost point of the power switch pipe in the DC transfer circuit join, and inverter contains the full-control type electronic switching device.
2, as the said induction heating equipment of claim 1, it is characterized in that: be added with isolating transformer between inverter and induction heating load,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94213956 CN2195175Y (en) | 1994-06-04 | 1994-06-04 | Switch type frequency-change induction heating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94213956 CN2195175Y (en) | 1994-06-04 | 1994-06-04 | Switch type frequency-change induction heating apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2195175Y true CN2195175Y (en) | 1995-04-19 |
Family
ID=33830359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94213956 Expired - Fee Related CN2195175Y (en) | 1994-06-04 | 1994-06-04 | Switch type frequency-change induction heating apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2195175Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101507351B (en) * | 2006-08-25 | 2012-02-15 | E.G.O.电气设备制造股份有限公司 | Method and arrangement for the power supply of an induction heating device |
| CN102938948A (en) * | 2012-11-25 | 2013-02-20 | 淄博市临淄银河高技术开发有限公司 | Constant-voltage precisely-controlled induction heating equipment |
-
1994
- 1994-06-04 CN CN 94213956 patent/CN2195175Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101507351B (en) * | 2006-08-25 | 2012-02-15 | E.G.O.电气设备制造股份有限公司 | Method and arrangement for the power supply of an induction heating device |
| CN102938948A (en) * | 2012-11-25 | 2013-02-20 | 淄博市临淄银河高技术开发有限公司 | Constant-voltage precisely-controlled induction heating equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |